Manufacture, Stockholder And Distributors of Alloy Steel, Stainless Steel Bolting Materials

Designation: A193/A193M – 10a
Standard Specification for
Alloy-Steel and Stainless Steel Bolting for High Temperature
or High Pressure Service and Other Special Purpose
Applications1
This standard is issued under the fixed designation A193/A193M; the number immediately following the designation indicates the year
of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.
A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.

Scope*
1.1 This specification2 covers alloy and stainless steel bolting
for pressure vessels, valves, flanges, and fittings for high
temperature or high pressure service, or other special purpose
applications. See Specification A962/A962M for the definition
of bolting. Bars and wire shall be hot-wrought and may be
further processed by centerless grinding or by cold drawing.
Austenitic stainless steel may be carbide solution treated or
carbide solution treated and strain-hardened. When strain
hardened austenitic steel is ordered, the purchaser should take
special care to ensure that Appendix X1 is thoroughly understood.
1.2 Several grades are covered, including ferritic steels and
austenitic stainless steels designated B5, B8, and so forth.
Selection will depend upon design, service conditions, mechanical
properties, and high temperature characteristics.
1.3 The following referenced general requirements are indispensable
for application of this specification: Specification
A962/A962M.
NOTE 1—The committee formulating this specification has included
fifteen steel types that have been rather extensively used for the present
purpose. Other compositions will be considered for inclusion by the
committee from time to time as the need becomes apparent.
NOTE 2—For grades of alloy-steel bolting suitable for use at the lower
range of high temperature applications, reference should be made to
Specification A354.
NOTE 3—For grades of alloy-steel bolting suitable for use in low
temperature applications, reference should be made to Specification
A320/A320M.
1.4 Nuts for use with bolting are covered in Section 14.
1.5 Supplementary Requirements are provided for use at the
option of the purchaser. The supplementary requirements shall
apply only when specified in the purchase order or contract.
1.6 This specification is expressed in both inch-pound units
and in SI units; however, unless the purchase order or contract
specifies the applicable M specification designation (SI units),
the inch-pound units shall apply.
1.7 The values stated in either SI units or inch-pound units
are to be regarded separately as standard. Within the text, the
SI units are shown in brackets. The values stated in each
system may not be exact equivalents; therefore, each system
shall be used independently of the other. Combining values
from the two systems may result in non-conformance with the
standard.
Referenced Documents
2.1 ASTM Standards:3
A153/A153M Specification for Zinc Coating (Hot-Dip) on
Iron and Steel Hardware
A194/A194M Specification for Carbon and Alloy Steel
Nuts for Bolts for High Pressure or High Temperature
Service, or Both
A320/A320M Specification for Alloy-Steel and Stainless
Steel Bolting for Low-Temperature Service
A354 Specification for Quenched and Tempered Alloy Steel
Bolts, Studs, and Other Externally Threaded Fasteners
A788/A788M Specification for Steel Forgings, General Requirements
A962/A962M Specification for Common Requirements for
Bolting Intended for Use at Any Temperature from Cryogenic
to the Creep Range
B633 Specification for Electrodeposited Coatings of Zinc
on Iron and Steel
1 This specification is under the jurisdiction of ASTM Committee A01 on Steel,
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
A01.22 on Steel Forgings and Wrought Fittings for Piping Applications and Bolting
Materials for Piping and Special Purpose Applications.
Current edition approved May 15, 2010. Published June 2010. Originally
approved in 1936. Last previous edition approved in 2010 as A193/A193M–10.
DOI: 10.1520/A0193_A0193M-10a.
2 For ASME Boiler and Pressure Vessel Code applications, see related Specification
SA-193 in Section II of that Code.
3 For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
1
*A Summary of Changes section appears at the end of this standard.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
B695 Specification for Coatings of Zinc Mechanically Deposited
on Iron and Steel
B696 Specification for Coatings of Cadmium Mechanically
Deposited
B766 Specification for Electrodeposited Coatings of Cadmium
E18 Test Methods for Rockwell Hardness of Metallic Materials
E21 Test Methods for Elevated Temperature Tension Tests
of Metallic Materials
E112 Test Methods for Determining Average Grain Size
E139 Test Methods for Conducting Creep, Creep-Rupture,
and Stress-Rupture Tests of Metallic Materials
E150 Recommended Practice for Conducting Creep and
Creep-Rupture Tension Tests of Metallic Materials Under
Conditions of Rapid Heating and Short Times4
E151 Recommended Practice for Tension Tests of Metallic
Materials at Elevated Temperatures with Rapid Heating
and Conventional or Rapid Strain Rates4
E292 Test Methods for Conducting Time-for-Rupture
Notch Tension Tests of Materials
E328 Test Methods for Stress Relaxation for Materials and
Structures
E566 Practice for Electromagnetic (Eddy-Current) Sorting
of Ferrous Metals
E709 Guide for Magnetic Particle Testing
F606 Test Methods for Determining the Mechanical Properties
of Externally and Internally Threaded Fasteners,
Washers, Direct Tension Indicators, and Rivets
F1940 Test Method for Process Control Verification to
Prevent Hydrogen Embrittlement in Plated or Coated
Fasteners
F1941 Specification for Electrodeposited Coatings on
Threaded Fasteners (Unified Inch Screw Threads (UN/
UNR))
F2329 Specification for Zinc Coating, Hot-Dip, Requirements
for Application to Carbon and Alloy Steel Bolts,
Screws, Washers, Nuts, and Special Threaded Fasteners
2.2 ASME Standards:5
B18.2.1 Square and Hex Bolts and Screws
B18.2.3.1M Metric Hex Cap Screws
B18.3 Hexagon Socket and Spline Socket Screws
B18.3.1M Metric Socket Head Cap Screws
2.3 AIAG Standard:6
AIAG B-5 02.00 Primary Metals Identification Tag Application
Standard
General Requirements and Ordering Information
3.1 The inquiry and orders shall include the following, as
required, to describe the desired material adequately:
3.1.1 Heat-treated condition (that is carbide solution treated
(Class 1), carbide solution treated after finishing (Class 1A),
and carbide solution treated and strain-hardened (Classes 2, 2B
and 2C), for the austenitic stainless steels; Classes 1B and 1C
apply to the carbide solution-treated nitrogen-bearing stainless
steels; Class 1D applies to material carbide solution treated by
cooling rapidly from the rolling temperature),
3.1.2 Description of items required (that is, bars, bolts,
screws, or studs),
3.1.3 Nuts, if required by purchaser, in accordance with
14.1,
3.1.4 Supplementary requirements, if any, and
3.1.5 Special requirements, in accordance with 7.1.5.1,
7.2.6, 9.1, 14.1, and 15.1.
3.2 Coatings—Coatings are prohibited unless specified by
the purchaser (See Supplementary Requirements S13 and S14).
When coated fasteners are ordered the purchaser should take
special care to ensure that Appendix X2 is thoroughly understood.
Common Requirements
4.1 Bolting supplied to this specification shall conform to
the requirements of Specification A962/A962M. These requirements
include test methods, finish, thread dimensions, macroetch
(alloy steels only), marking, certification, optional supplementary
requirements, and others. Failure to comply with the
requirements of Specification A962/A962M constitutes nonconformance
with this specification. In case of conflict between
this specification and Specification A962/A962M, this
specification shall prevail.
Manufacture (Process)
5.1 The steel shall be produced by any of the following
processes: open-hearth, basic-oxygen, electric-furnace, or
vacuum-induction melting (VIM). The molten steel may be
vacuum-treated prior to or during pouring of the ingot or strand
casting.
5.2 Quality—See Specification A962/A962M for requirements.
Discard
6.1 A sufficient discard shall be made to secure freedom
from injurious piping and undue segregation.
Heat Treatment
7.1 Ferritic Steels
7.1.1 Ferritic steels shall be allowed to cool to a temperature
below the cooling transformation range immediately after
rolling or forging. Materials shall then be uniformly reheated to
the proper temperature to refine the grain (a group thus
reheated being known as a quenching charge), quenched in a
liquid medium under substantially uniform conditions for each
quenching charge, and tempered. The minimum tempering
temperature shall be as specified in Tables 2 and 3.
4 Withdrawn. The last approved version of this historical standard is referenced
on www.astm.org.
5 Available from American Society of Mechanical Engineers (ASME), ASME
International Headquarters, Three Park Ave., New York, NY 10016-5990, http://
www.asme.org.
6 Available from Automotive Industry Action Group (AIAG), 26200 Lahser Rd.,
Suite 200, Southfield, MI 48033, http://www.aiag.org.
A193/A193M – 10a
2
TABLE 1 Chemical Requirements (Composition, percent)A
Type . . . . . . . . . Ferritic Steels
Grade . . . . . . . . B5 B6 and B6X
Description. . . . . . . . 5% Chromium 12 % Chromium
UNS Designation . . . . . . . . S41000 (410)
Range Product Variation, Range Product Variation
Over or UnderB Over or UnderB
Carbon 0.10 min 0.01 under 0.08–0.15 0.01 over
Manganese, max 1.00 0.03 over 1.00 0.03 over
Phosphorus, max 0.040 0.005 over 0.040 0.005 over
Sulfur, max 0.030 0.005 over 0.030 0.005 over
Silicon 1.00 max 0.05 over 1.00 max 0.05 over
Chromium 4.0–6.0 0.10 11.5–13.5 0.15
Molybdenum 0.40–0.65 0.05 . . . . . .
Type . . . . . . . . . . Ferritic Steels
Grade . . . . . . B7, B7M B16
Description . . . . . . . . . Chromium-MolybdenumC Chromium-Molybdenum-Vanadium
Product Variation, Product Variation,
Range Over or UnderB Range Over or UnderB
Carbon 0.37–0.49D 0.02 0.36–0.47 0.02
Manganese 0.65–1.10 0.04 0.45–0.70 0.03
Phosphorus, max 0.035 0.005 over 0.035 0.005 over
Sulfur, max 0.040 0.005 over 0.040 0.005 over
Silicon 0.15–0.35 0.02 0.15–0.35 0.02
Chromium 0.75–1.20 0.05 0.80–1.15 0.05
Molybdenum 0.15–0.25 0.02 0.50–0.65 0.03
Vanadium . . . . . . 0.25–0.35 0.03
Aluminum, max %E . . . . . . 0.015 . . .
Type Austenitic Steels,F Classes 1, 1A, 1D, and 2
Grade . . B8, B8A B8C, B8CA B8M, B8MA, B8M2, B8M3 B8P, B8PA
UNS Designation . . . . . . S30400 (304) S34700 (347) S31600 (316) S30500
Range
Product Variation,
Over or UnderB Range
Product Variation,
Over or UnderB Range
Product Variation,
Over or UnderB Range
Product Variation,
Over or UnderB
Carbon, max 0.08 0.01 over 0.08 0.01 over 0.08 0.01 over 0.12 0.01 over
Manganese, max 2.00 0.04 over 2.00 0.04 over 2.00 0.04 over 2.00 0.04 over
Phosphorus, max 0.045 0.010 over 0.045 0.010 over 0.045 0.010 over 0.045 0.010 over
Sulfur, max 0.030 0.005 over 0.030 0.005 over 0.030 0.005 over 0.030 0.005 over
Silicon, max 1.00 0.05 over 1.00 0.05 over 1.00 0.05 over 1.00 0.05 over
Chromium 18.0–20.0 0.20 17.0–19.0 0.20 16.0–18.0 0.20 17.0–19.0 0.20
Nickel 8.0–11.0 0.15 9.0–12.0 0.15 10.0–14.0 0.15 11.0–13.0 0.15
Molybdenum . . . . . . . . . . . . 2.00–3.00 0.10 . . . . . .
Columbium + . . . . . . 10 x carbon 0.05 under . . . . . . . . . . . .
tantalum content, min;
1.10 max
Type . . . . . . . . . . Austenitic Steels,F Classes 1A, 1B, 1D, and 2
Grade . . . . . B8N, B8NA B8MN, B8MNA B8MLCuN, B8MLCuNA
UNS Designation . . . .
. . . . . .
S30451 (304N) S31651 (316N) S31254
Range
Product Variation,
Over or UnderB Range
Product Variation,
Over or UnderB
Range Product Variation,
Over or UnderB
Carbon, max 0.08 0.01 over 0.08 0.01 over 0.020 0.005 over
Manganese, max 2.00 0.04 over 2.00 0.04 over 1.00 0.03 over
Phosphorus, max 0.045 0.010 over 0.045 0.010 over 0.030 0.005 over
Sulfur, max 0.030 0.005 over 0.030 0.005 over 0.010 0.002 over
Silicon, max 1.00 0.05 over 1.00 0.05 over 0.80 0.05 over
Chromium 18.0–20.0 0.20 16.0–18.0 0.20 19.5–20.5 0.20
Nickel 8.0–11.0 0.15 10.0–13.0 0.15 17.5–18.5 0.15
Molybdenum . . . . . . 2.00–3.00 0.10 6.0–6.5 0.10
Nitrogen 0.10–0.16 0.01 0.10–0.16 0.01 0.18–0.22 0.02
Copper . . . . . . . . . . . . 0.50–1.00 . . .
A193/A193M – 10a
3
TABLE 1 Continued
Type. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Austenitic SteelsF, Classes 1, 1A, and 2
Grade . . . . . . . . . . . . . . . . . . B8T, B8TA
UNS Designation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S32100 (321)
Range
Product Variation,
Over or UnderB
Carbon, max 0.08 0.01 over
Manganese, max 2.00 0.04 over
Phosphorus, max 0.045 0.010 over
Sulfur, max 0.030 0.005 over
Silicon, max 1.00 0.05 over
Chromium 17.0–19.0 0.20
Nickel 9.0–12.0 0.15
Titanium 5 x (C + N) min, 0.70 max 0.05 under
Nitrogen 0.10 max . . .
Type Austenitic SteelsF, Classes 1C and 1D
Grade B8R, B8RA B8S, B8SA
UNS Designation S20910 S21800
Range
Product Variation,
Over or UnderB Range
Product Variation,
Over or UnderB
Carbon, max 0.06 0.01 over 0.10 0.01 over
Manganese 4.0–6.0 0.05 7.0–9.0 0.06
Phosphorus, max 0.045 0.005 over 0.060 0.005 over
Sulfur, max 0.030 0.005 over 0.030 0.005 over
Silicon 1.00 max 0.05 over 3.5–4.5 0.15
Chromium 20.5–23.5 0.25 16.0–18.0 0.20
Nickel 11.5–13.5 0.15 8.0–9.0 0.10
Molybdenum 1.50–3.00 0.10 . . . . . .
Nitrogen 0.20–0.40 0.02 0.08–0.18 0.01
Columbium + tantalum 0.10–0.30 0.05 . . . . . .
Vanadium 0.10–0.30 0.02 . . . . . .
Type Austenitic SteelsF, Classes 1, 1A and 1D
Grade B8LN, B8LNA B8MLN, B8MLNA
UNS Designation S30453 S31653
Range
Product Variation,
Over or UnderB Range
Product Variation,
Over or UnderB
Carbon, max 0.030 0.005 over 0.030 0.005 over
Manganese 2.00 0.04 over 2.00 0.04 over
Phosphorus, max 0.045 0.010 over 0.045 0.010 over
Sulfur, max 0.030 0.005 over 0.030 0.005 over
Silicon 1.00 0.05 over 1.00 0.05 over
Chromium 18.0–20.0 0.20 16.0–18.0 0.20
Nickel 8.0–11.0 0.15 10.0–13.0 0.15
Molybdenum . . . . . . 2.00–3.00 0.10
Nitrogen 0.10–0.16 0.01 0.10–0.16 0.01
A The intentional addition of Bi, Se, Te, and Pb is not permitted.
B Product analysis—Individual determinations sometimes vary from the specified limits on ranges as shown in the tables. The several determinations of any individual
element in a heat may not vary both above and below the specified range.
C Typical steel compositions used for this grade include 4140, 4142, 4145, 4140H, 4142H, and 4145H.
D For bar sizes over 31⁄2 in. [90 mm], inclusive, the carbon content may be 0.50 %, max. For the B7M grade, a minimum carbon content of 0.28 % is permitted, provided
that the required tensile properties are met in the section sizes involved; the use of AISI 4130 or 4130H is allowed.
E Total of soluble and insoluble.
F Classes 1 and 1D are solution treated. Classes 1, 1B, and some 1C (B8R and B8S) products are made from solution treated material. Class 1A (B8A, B8CA, B8MA,
B8PA, B8TA, B8LNA, B8MLNA, B8NA, and B8MNA) and some Class 1C (B9RA and B8SA) products are solution treated in the finished condition. Class 2 products are
solution treated and strain hardened.
A193/A193M – 10a
4
TABLE 2 Mechanical Requirements — Inch Products
Grade Diameter, in.
Minimum
Tempering
Temperature,
°F
Tensile
Strength,
min, ksi
Yield Strength,
min, 0.2 %
offset,
ksi
Elongation
in 4D,
min, %
Reduction
of Area,
min, %
Hardness,
max
Ferritic Steels
B5
4 to 6 % chromium up to 4, incl 1100 100 80 16 50 . . .
B6
13 % chromium up to 4, incl 1100 110 85 15 50 . . .
B6X
13 % chromium up to 4, incl 1100 90 70 16 50 26 HRC
B7
Chromium-molybdenum 21⁄2 and under 1100 125 105 16 50 321 HB or
35 HRC
over 21⁄2 to 4 1100 115 95 16 50 321 HB or
35 HRC
over 4 to 7 1100 100 75 18 50 321 HB or
35 HRC
B7MAChromium-molybdenum 4 and under 1150 100 80 18 50 235 HB or
99 HRB
over 4 to 7 1150 100 75 18 50 235 BHN or
99 HRB
B16
Chromium-molybdenum-vanadium 21⁄2 and under 1200 125 105 18 50 321 HB or
35 HRC
over 21⁄2 to 4 1200 110 95 17 45 321 HB or
35 HRC
over 4 to 8 1200 100 85 16 45 321 HB or
35 HRC
Grade, Diameter, in. Heat TreatmentB
Tensile
Strength,
min, ksi
Yield
Strength,
min, 0.2
% offset,
ksi
Elongation
in 4 D,
min %
Reduction
of Area,
min %
Hardness,
max
Austenitic Steels
Classes 1 and 1D; B8, B8M, B8P,
B8LN,
carbide solution treated 75 30 30 50 223 HB or 96 HRBC
B8MLN, all diameters
Class 1: B8C, B8T, all
diameters
carbide solution treated 75 30 30 50 223 HB or 96HRBC
Class 1A: B8A, B8CA, B8MA,
B8PA, B8TA, B8LNA, B8MLNA,
B8NA, B8MNA
B8MLCuNA, all diameters
carbide solution treated in the finished
condition
75 30 30 50 192 HB or 90 HRB
Classes 1B and 1D: B8N, B8MN, carbide solution treated 80 35 30 40 223 HB or 96 HRBC
B8MLCuN, all diameters
Classes 1C and 1D: B8R, all
diameters
carbide solution treated 100 55 35 55 271 HB or 28 HRC
Class 1C: B8RA, all diameters carbide solution treated in the finished
condition
100 55 35 55 271 HB or 28 HRC
Classes 1C and 1D: B8S, all
diameters
carbide solution treated 95 50 35 55 271 HB or 28 HRC
Classes 1C: B8SA, carbide solution treated in the finished 95 50 35 55 271 HB or 28 HRC
all diameters condition
Class 2: B8, B8C, B8P, B8T,
B8N,D
3⁄4 and under
carbide solution treated and strain
hardened
125 100 12 35 321 HB or 35 HRC
over 3⁄4 to 1, incl 115 80 15 35 321 HB or 35 HRC
over 1 to 11⁄4 , incl 105 65 20 35 321 HB or 35 HRC
over 11⁄4 to 11⁄2 , incl 100 50 28 45 321 HB or 35 HRC
Class 2: B8M, B8MN, B8MLCuND
3⁄4 and under
carbide solution treated and strain
hardened
110 95 15 45 321 HB or 35 HRC
over 3⁄4 to 1 incl 100 80 20 45 321 HB or 35 HRC
Over 1 to 11⁄4 , incl 95 65 25 45 321 HB or 35 HRC
over 11⁄4 to 11⁄2 , incl 90 50 30 45 321 HB or 35 HRC
Class 2B: B8, B8M2D
2 and under
carbide solution treated and strain
hardened
95 75 25 40 321 HB or 35 HRC
over 2 to 21⁄2 incl 90 65 30 40 321 HB or 35 HRC
A193/A193M – 10a
5
TABLE 2 Continued
Grade, Diameter, in. Heat TreatmentB
Tensile
Strength,
min, ksi
Yield
Strength,
min, 0.2
% offset,
ksi
Elongation
in 4 D,
min %
Reduction
of Area,
min %
Hardness,
max
Austenitic Steels
over 21⁄2 to 3 incl 80 55 30 40 321 HB or 35 HRC
Class 2C: B8M3D
2 and under
carbide solution treated and strain
hardened
85 65 30 60 321 HB or 35 HRC
over 2 85 60 30 60 321 HB or 35 HRC
A To meet the tensile requirements, the Brinell hardness shall be over 200 HB (93 HRB).
B Class 1 is solution treated. Class 1A is solution treated in the finished condition for corrosion resistance; heat treatment is critical due to physical property requirement.
Class 2 is solution treated and strain hardened. Austenitic steels in the strain-hardened condition may not show uniform properties throughout the section particularly in
sizes over 3⁄4 in. in diameter.
C For sizes 3⁄4 in. in diameter and smaller, a maximum hardness of 241 HB (100 HRB) is permitted.
D For diameters 11⁄2 and over, center (core) properties may be lower than indicated by test reports which are based on values determined at 1⁄2 radius.
TABLE 3 Mechanical Requirements—Metric Products
Class Diameter, [mm]
Minimum
Tempering
Temperature,
°C
Tensile
Strength,
min,
MPa
Yield Strength,
min, 0.2 %
offset,
MPa
Elongation
in 4D,
min, %
Reduction
of Area,
min, %
Hardness,
max
Ferritic Steels
B5
4 to 6 % chromium up to M100, incl 593 690 550 16 50 . . .
B6
13 % chromium up to M100, incl 593 760 585 15 50 . . .
B6X
13 % chromium up to M100, incl 593 620 485 16 50 26 HRC
B7
Chromium-molybdenum M64 and under 593 860 720 16 50 321 HB or
35 HRC
over M64 to M100 593 795 655 16 50 321 HB or
35 HRC
over M100 to M180 593 690 515 18 50 321 HB or
35 HRC
B7MAChromium-molybdenum M100 and under 620 690 550 18 50 235 HB or
99 HRB
over M100 to M180 620 690 515 18 50 235 BHN or
99 HRB
B16
Chromium-molybdenum-vanadium M64 and under 650 860 725 18 50 321 HB or
35 HRC
over M64 to M100 650 760 655 17 45 321 HB or
35 HRC
over M100 to M180 650 690 585 16 45 321 HB or
35 HRC
Class Diameter, mm Heat TreatmentB
Tensile
Strength,
min,
MPa
Yield
Strength,
min, 0.2
% offset,
MPa
Elongation
in 4 D,
min %
Reduction
of Area,
min %
Hardness,
max
Austenitic Steels
Classes 1 and 1D; B8, B8M, B8P, B8LN, carbide solution treated 515 205 30 50 223 HB or 96 HRBC
B8MLN, all diameters
Class 1: B8C, B8T, all
diameters
carbide solution treated 515 205 30 50 223 HB or 96HRBC
Class 1A: B8A, B8CA, B8MA, B8PA,
B8TA, B8LNA, B8MLNA, B8NA, B8MNA
B8MLCuNA, all diameters
carbide solution treated in the finished
condition
515 205 30 50 192 HB or 90 HRB
Classes 1B and 1D: B8N, B8MN, carbide solution treated 550 240 30 40 223 HB or 96 HRBC
B8MLCuN, all diameters
Classes 1C and 1D: B8R, all diameters carbide solution treated 690 380 35 55 271 HB or 28 HRC
Class 1C: B8RA, all diameters carbide solution treated in the finished
condition
690 380 35 55 271 HB or 28 HRC
Classes 1C and 1D: B8S, all diameters carbide solution treated 655 345 35 55 271 HB or 28 HRC
Classes 1C: B8SA, carbide solution treated in the finished 655 345 35 55 271 HB or 28 HRC
A193/A193M – 10a
6
TABLE 3 Continued
Class Diameter, mm Heat TreatmentB
Tensile
Strength,
min,
MPa
Yield
Strength,
min, 0.2
% offset,
MPa
Elongation
in 4 D,
min %
Reduction
of Area,
min %
Hardness,
max
Austenitic Steels
all diameters condition
Class 2: B8, B8C, B8P, B8T, B8N,D
M20 and under
carbide solution treated and strain
hardened
860 690 12 35 321 HB or 35 HRC
over M20 to M24, incl 795 550 15 35 321 HB or 35 HRC
over M24 to M30, incl 725 450 20 35 321 HB or 35 HRC
over M30 to M36, incl 690 345 28 45 321 HB or 35 HRC
Class 2: B8M, B8MN, B8MLCuN,D
M20 and under
carbide solution treated and strain
hardened
760 655 15 45 321 HB or 35 HRC
over M20 to M24, incl 690 550 20 45 321 HB or 35 HRC
over M24 to M30, incl 655 450 25 45 321 HB or 35 HRC
over M30 to M36, incl 620 345 30 45 321 HB or 35 HRC
Class 2B: B8, B8M2,D
M48 and under
carbide solution treated and strain
hardened
655 515 25 40 321 HB or 35 HRC
over M48 to M64, incl 620 450 30 40 321 HB or 35 HRC
over M64 to M72, incl 550 380 30 40 321 HB or 35 HRC
Class 2C: B8M3,D
M48 and under
carbide solution treated and strain
hardened
585 450 30 60 321 HB or 35 HRC
over M48 585 415 30 60 321 HB or 35 HRC
A To meet the tensile requirements, the Brinell hardness shall be over 200 HB (93 HRB).
B Class 1 is solution treated. Class 1A is solution treated in the finished condition for corrosion resistance; heat treatment is critical due to physical property requirement.
Class 2 is solution treated and strain hardened. Austenitic steels in the strain-hardened condition may not show uniform properties throughout the section particularly in
sizes over M20 mm in diameter
C For sizes M20 mm in diameter and smaller, a maximum hardness of 241 HB (100 HRB) is permitted.
D For diameters M38 and over, center (core) properties may be lower than indicated by test reports which are based on values determined at 1⁄2 radius.
7.1.2 Use of water quenching is prohibited for any ferritic
grade when heat treatment is performed after heading or
threading.
7.1.3 Except as permitted below for B6X; material that is
subsequently cold drawn for dimensional control shall be
stress-relieved after cold drawing. The minimum stress-relief
temperature shall be 100 °F [55 °C] below the tempering
temperature. Tests for mechanical properties shall be performed
after stress relieving.
7.1.4 B6 and B6X shall be held at the tempering temperature
for a minimum time of 1 h. B6X material may be furnished
in the as-rolled-and-tempered condition. Cold working after
heat treatment is permitted for B6X material provided the final
hardness meets the requirements of Tables 2 and 3.
7.1.5 B7 and B7M shall be heat treated by quenching in a
liquid medium and tempering. For B7M fasteners, the final
heat treatment, which may be the tempering operation if
conducted at 1150 °F [620 °C] minimum, shall be done after all
machining and forming operations, including thread rolling
and any type of cutting. Surface preparation for hardness
testing, nondestructive evaluation, or ultrasonic bolt tensioning
is permitted.
7.1.5.1 Unless otherwise specified, material for Grade B7
may be heat treated by the Furnace, the Induction or the
Electrical Resistance method.
NOTE 4—Stress-relaxation properties may vary from heat lot to heat lot
or these properties may vary from one heat-treating method to another.
The purchaser may specify Supplementary Requirement S8, when stressrelaxation
testing is desired.
7.1.6 Material Grade B16 shall be heated to a temperature
range from 1700 to 1750 °F [925 to 955 °C] and oil quenched.
The minimum tempering temperature shall be as specified in
Tables 2 and 3.
7.2 Austenitic Stainless Steels
7.2.1 All austenitic stainless steels shall receive a carbide
solution treatment (see 7.2.2-7.2.5 for specific requirements for
each class). Classes 1, 1B, 1C (Grades B8R and B8S only), 2,
2B, and 2C can apply to bar, wire, and finished fasteners. Class
1A (all grades) and Class 1C (grades B8RA and B8SA only)
can apply to finished fasteners. Class 1D applies only to bar
and wire and finished fasteners that are machined directly from
Class 1D bar or wire without any subsequent hot or cold
working.
7.2.2 Classes 1 and 1B, and Class 1C Grades B8R and
B8S—After rolling of the bar, forging, or heading, whether
done hot or cold, the material shall be heated from ambient
temperature and held a sufficient time at a temperature at which
the chromium carbide will go into solution and then shall be
cooled at a rate sufficient to prevent the precipitation of the
carbide.
7.2.3 Class 1D—Rolled or forged Grades B8, B8M, B8P,
B8LN, B8MLN, B8N, B8MN, B8R, and B8S bar shall be
cooled rapidly immediately following hot working while the
temperature is above 1750 °F [955 °C] so that grain boundary
carbides remain in solution. Class 1D shall be restricted to
applications at temperatures less than 850 °F [455 °C].
7.2.4 Class 1A and Class 1C Grades B8RA and B8SA—
Finished fasteners shall be carbide solution treated after all
A193/A193M – 10a
7
rolling, forging, heading, and threading operations are complete.
This designation does not apply to starting material such
as bar. Fasteners shall be heated from ambient temperature and
held a sufficient time at a temperature at which the chromium
carbide will go into solution and then shall be cooled at a rate
sufficient to prevent the precipitation of the carbide.
7.2.5 Classes 2, 2B, and 2C—Material shall be carbide
solution treated by heating from ambient temperature and
holding a sufficient time at a temperature at which the
chromium carbide will go into solution and then cooling at a
rate sufficient to prevent the precipitation of the carbide.
Following this treatment the material shall then be strain
hardened to achieve the required properties.
NOTE 5—Heat treatment following operations performed on a limited
portion of the product, such as heading, may result in non-uniform grain
size and mechanical properties through the section affected.
7.2.6 If a scale-free bright finish is required; this shall be
specified in the purchase order.
Chemical Composition
8.1 Each alloy shall conform to the chemical composition
requirements prescribed in Table 1.
8.2 The steel shall not contain an unspecified element for
the ordered grade to the extent that the steel conforms to the
requirements of another grade for which that element is a
specified element. Furthermore, elements present in concentrations
greater than 0.75 weight/% shall be reported.
Heat Analysis
9.1 An analysis of each heat of steel shall be made by the
manufacturer to determine the percentages of the elements
specified in Section 8. The chemical composition thus determined
shall be reported to the purchaser or the purchaser’s
representative, and shall conform to the requirements specified
in Section 8. Should the purchaser deem it necessary to have
the transition zone of two heats sequentially cast discarded, the
purchaser shall invoke Supplementary Requirement S3 of
Specification A788/A788M.
Mechanical Properties
10.1 Tensile Properties:
10.1.1 Requirements—The material as represented by the
tension specimens shall conform to the requirements prescribed
in Tables 2 and 3 at room temperature after heat
treatment. Alternatively, stainless strain hardened fasteners
(Class 2, 2B, and 2C) shall be tested full size after strain
hardening to determine tensile strength and yield strength and
shall conform to the requirements prescribed in Tables 2 and 3.
Should the results of full size tests conflict with results of
tension specimen tests, full size test results shall prevail.
10.1.2 Full Size Fasteners, Wedge Tensile Testing—When
applicable, see 13.1.3, headed fasteners shall be wedge tested
full size. The minimum full size load applied (lbf or kN) for
individual sizes shall be as follows:
W 5 Ts 3 At (1)
where:
W = minimum wedge tensile load without fracture,
Ts = tensile strength specified in ksi or MPa in Tables 2 and
3, and
At = stress area of the thread section, square inches or
square milimetres, as shown in the Cone Proof Load
Tables in Specification A962/A962M.
10.2 Hardness Requirements:
10.2.1 The hardness shall conform to the requirements
prescribed in Tables 2 and 3. Hardness testing shall be
performed in accordance with either Specification A962/
A962M or with Test Methods F606.
10.2.2 Grade B7M—The maximum hardness of the grade
shall be 235 HB or 99 HRB. The minimum hardness shall not
be less than 200 HB or 93 HRB. Conformance to this hardness
shall be ensured by testing the hardness of each stud or bolt by
Brinell or Rockwell B methods in accordance with 10.2.1. The
use of 100 % electromagnetic testing for hardness as an
alternative to 100 % indentation hardness testing is permissible
when qualified by sampling using indentation hardness testing.
Each lot tested for hardness electromagnetically shall be 100 %
examined in accordance with Practice E566. Following electromagnetic
testing for hardness a random sample of a minimum
of 100 pieces of each heat of steel in each lot (as defined
in 13.1.1) shall be tested by indentation hardness methods. All
samples must meet hardness requirements to permit acceptance
of the lot. If any one sample is outside of the specified
maximum or minimum hardness, the lot shall be rejected and
either reprocessed and resampled or tested 100 % by indentation
hardness methods.
10.2.2.1 Surface preparation for indentation hardness testing
shall be in accordance with Test Methods E18. Hardness
tests shall be performed on the end of the bolt or stud. When
this is impractical, the hardness test shall be performed
elsewhere.
Workmanship, Finish, and Appearance
11.1 Bolts, screws, studs, and stud bolts shall be pointed and
shall have a workmanlike finish. Points shall be flat and
chamfered or rounded at option of the manufacturer. Length of
point on studs and stud bolts shall be not less than one nor more
than two complete threads as measured from the extreme end
parallel to the axis. Length of studs and stud bolts shall be
measured from first thread to first thread.
11.2 Bolt heads shall be in accordance with the dimensions
of ASME B18.2.1 or ASME B18.2.3.1M. Unless otherwise
specified in the purchase order, the Heavy Hex Screws Series
should be used, except the maximum body diameter and radius
of fillet may be the same as for the Heavy Hex Bolt Series. The
body diameter and head fillet radius for sizes of Heavy Hex
Cap Screws and Bolts that are not shown in their respective
tables in ASME B18.2.1 or ASME B18.2.3.1M may be that
shown in the corresponding Hex Cap Screw and Bolt Tables
respectively. Socket head fasteners shall be in accordance with
ASME B18.3 or ASME B18.3.1M.
Retests
12.1 If the results of the mechanical tests of any test lot do
not conform to the requirements specified, the manufacturer
may retreat such lot not more than twice, in which case two
A193/A193M – 10a
8
additional tension tests shall be made from such lot, all of
which shall conform to the requirements specified.
Test Specimens
13.1 Number of Tests—For heat-treated bars, one tension
test shall be made for each diameter of each heat represented in
each tempering charge. When heat treated without interruption
in continuous furnaces, the material in a lot shall be the same
heat, same prior condition, same size, and subjected to the
same heat treatment. Not fewer than two tension tests are
required for each lot containing 20 000 lb [9000 kg] or less.
Every additional 10 000 lb [4500 kg] or fraction thereof
requires one additional test.
13.1.1 For studs, bolts, screws, and so forth, one tension test
shall be made for each diameter of each heat involved in the
lot. Each lot shall consist of the following:
Diameter, in. [mm] Lot Size
11⁄8 [30] and under 1500 lb [780 kg] or fraction thereof
Over 11⁄8 [30] to 13⁄4 [42], incl 4500 lb [2000 kg] or fraction thereof
Over 13⁄4 [42] to 21⁄2 [64], incl 6000 lb [2700 kg] or fraction thereof
Over 21⁄2 [64] 100 pieces or fraction thereof
13.1.2 Tension tests are not required to be made on bolts,
screws, studs, or stud bolts that are fabricated from heat-treated
bars furnished in accordance with the requirements of this
specification and tested in accordance with 13.1, provided they
are not given a subsequent heat treatment.
13.1.3 Full Size Specimens, Headed Fasteners—Headed
fasteners 11⁄2 in. in body diameter and smaller, with body
length three times the diameter or longer, and that are produced
by upsetting or forging (hot or cold) shall be subjected to full
size testing in accordance with 10.1.2. This testing shall be in
addition to tensile testing as specified in 10.1.1. The lot size
shall be as shown in 13.1.1. Failure shall occur in the body or
threaded section with no failure, or indications of failure, such
as cracks, at the junction of the head and shank.
Nuts
14.1 Bolts, studs, and stud bolts shall be furnished with
nuts, when specified in the purchase order. Nuts shall conform
to Specification A194/A194M.
Rejection and Rehearing
15.1 Unless otherwise specified in the basis of purchase, any
rejection based on product analysis shall be reported to the
manufacturer within 30 days from the receipt of samples by the
purchaser.
15.2 Material that shows defects subsequent to its acceptance
at the place of manufacture shall be rejected, and the
manufacturer shall be notified.
15.3 Product Analysis—Samples that represent rejected material
shall be preserved for two weeks from the date of the test
report. In the case of dissatisfaction with the results of the test,
the manufacturer may make claim for a rehearing within that
time.
Certification
16.1 The producer of the raw material or finished fasteners
shall furnish a certification to the purchaser or his representative
showing the results of the chemical analysis, macroetch
examination (Carbon and Alloy Steels Only), and mechanical
tests, and state the method of heat treatment employed.
16.2 Certification shall also include at least the following:
16.2.1 Astatement that the material or the fasteners, or both,
were manufactured, sampled, tested, and inspected in accordance
with the specification and any supplementary requirements
or other requirements designated in the purchase order
or contract and was found to meet those requirements.
16.2.2 The specification number, year date, and identification
symbol.
Product Marking
17.1 See Specification A962/A962M. The marking symbol
shall be as shown in Table 4 and Table 5. Grade B7M shall be
100 % evaluated in conformance with the specification and
shall have a line under the marking symbol.
Keywords
18.1 alloy steel bars; alloy steel bolting; fasteners; hardness;
heat treatment; stainless steel bolting
TABLE 4 Marking of Ferritic Steels
Grade Marking Symbol
B5 B5
B6 B6
B6X B6X
B7 B7
B7M B7M
B16 B16
B16 +
Supplement S12
B16R
A193/A193M – 10a
9
SUPPLEMENTARY REQUIREMENTS
These requirements shall not apply unless specified in the order and in the Ordering Information,
in which event the specified tests shall be made before shipment of the product.
S1. High Temperature Tests
S1.1 Tests to determine high temperature properties shall be
made in accordance with Test Methods E21, E139, and E292,
and Practices E150 and E151.
S2. Charpy Impact Tests
S2.1 Charpy impact tests based on the requirements of
Specification A320/A320M, Sections 6 and 7, shall be made as
agreed between the manufacturer and the purchaser. When
testing temperatures are as low as those specified in Specification
A320/A320M, bolting should be ordered to that specification
in preference to this specification.
TABLE 5 Marking of Austenitic Steels
Class Grade Marking Symbol
Class 1 B8 B8
B8C B8C
B8M B8M
B8P B8P
B8T B8T
B8LN B8F or B8LN
B8MLN B8G or B8MLN
Class 1A B8A B8A
B8CA B8B or B8CA
B8MA B8D or B8MA
B8PA B8H or B8PA
B8TA B8J or B8TA
B8LNA B8L or B8LNA
B8MLNA B8K or B8MLNA
B8NA B8V or B8MA
B8MNA B8W or B8MNA
B8MLCuNA B9K or B8MLCuNA
Class 1B B8N
B8MN
B8MLCuN
B8N
B8Y or B8MN
B9J or B8MLCuN
Class 1C B8R B9A or B8R
B8RA B9B or B8RA
B8S B9D or B8S
B8SA B9F or B8SA
Class 1D B8 B94
B8M B95
B8P B96
B8LN B97
B8MLN B98
B8N B99
B8MN B100
B8R B101
B8S B102
Class 2 B8 B8SH
B8C B8CSH
B8P B8PSH
B8T B8TSH
B8N B8NSH
B8M B8MSH
B8MN B8YSH
B8MLCuN B0JSH
Class 2B B8M2
B8
B9G or B8M2
B9
Class 2C B8M3 B9H or B8M3
A193/A193M – 10a
10
S3. 100 % Hardness Testing of Grade B7M
S3.1 Each Grade B7M bolt or stud shall be tested for
hardness by indentation method and shall meet the requirements
specified in Tables 2 and 3.
S4. Hardness Testing of Grade B16
S4.1 For bolts or studs 21⁄2 in. [65 mm] or smaller, the
hardness for Grade B16 shall be measured on or near the end
of each bolt or stud using one of the methods prescribed in
10.2.1 for the Brinell or Rockwell C test. The hardness shall be
in the range 253–319 HB or 25–34 HRC.
S5. Product Marking
S5.1 Marking and manufacturer’s identification symbols
shall be applied to one end of studs and to the heads of bolts of
all sizes. (If the available area is inadequate, the marking
symbol may be marked on one end and the manufacturer’s
identification symbol marked on the other end.) For bolts
smaller than 1⁄4 in. [6 mm] in diameter and studs smaller
than 3⁄8 in. [10 mm] in diameter and for 1⁄4 in. [6 mm] in
diameter studs requiring more than a total of three symbols, the
marking shall be a matter of agreement between the purchaser
and the manufacturer.
S6. Stress Relieving
S6.1 A stress-relieving operation shall follow straightening
after heat treatment.
S6.2 The minimum stress-relieving temperature shall be
100 °F [55 °C] below the tempering temperature. Tests for
mechanical properties shall be performed after stress relieving.
S7. Magnetic Particle Inspection
S7.1 Bars shall be magnetic particle examined in accordance
with Guide E709. Bars with indications of cracks or
seams are subject to rejection if the indications extend more
than 3 % of the diameter into the bar.
S8. Stress-Relaxation Testing
S8.1 Stress-Relaxation Testing, when required, shall be
done in accordance with Test Methods E328. The test shall be
performed at 850 °F [454 °C] for a period of 100 h. The initial
stress shall be 50 M psi [345 MPa]. The residual stress at 100
h shall be 17 M psi [117 MPa] minimum.
S9. Grain Size Requirements for Non H Grade
Austenitic Steels Used Above 1000 °F
S9.1 For design metal temperatures above 1000 °F [540
°C], the material shall have a grain size of No. 7 or coarser as
determined in accordance with Test Methods E112. The grain
size so determined shall be reported on the Certificate of Test.
S10. Hardness Testing of Class 2 Bolting for ASME
Applications
S10.1 The maximum hardness shall be Rockwell C35 immediately
under the thread roots. The hardness shall be taken
on a flat area at least 1⁄8 in. [3 mm] across, prepared by
removing threads, and no more material than necessary shall be
removed to prepare the flat areas. Hardness determinations
shall be made at the same frequency as tensile tests.
S11. Thread Forming
S11.1 Threads shall be formed after heat treatment. Application
of this supplemental requirement to grade B7M or the
grades listed in 7.2.4 is prohibited.
S12. Stress Rupture Testing of Grade B16
S12.1 One test shall be made for each heat treat lot. Testing
shall be conducted using a combination test bar in accordance
with Test Methods E292. Rupture shall occur in the smooth
section of each test specimen. The test shall be conducted at
1100 °F [595 °C] and 20 ksi [140 MPa]. The test shall be
continued until the sample ruptures. Rupture life shall be 25 h
minimum. Testing is not required on material less than 1⁄2 in.
[12 mm] thick.
S12.2 When a purchase order for fasteners invokes S12, the
product marking supplied shall be “B16R.”
S13. Coatings on Fasteners
S13.1 It is the purchaser’s responsibility to specify in the
purchase order all information required by the coating facility.
Examples of such information may include but are not limited
to the following:
S13.1.1 Reference to the appropriate coating specification
and type, thickness, location, modification to dimensions, and
hydrogen embrittlement relief.
S13.1.2 Reference to Specifications A153/A153M, B633,
B695, B696, B766, or F1941, F2329, or Test Method F1940, or
other standards.
S14. Marking Coated Fasteners
S14.1 Material coated with zinc shall have ZN marked after
the grade symbol. Material coated with cadmium shall have
CD marked after the grade symbol.
NOTE S14.1—As an example, the marking for zinc-coated B7 will now
be B7ZN rather than B7. A193/A193M – 10a 11 APPENDIXES (Nonmandatory Information) X1. STRAIN HARDENING OF AUSTENITIC STEELS X1.1 Strain hardening is the increase in strength and hardness that results from plastic deformation below the recrystallization temperature (cold work). This effect is produced in austenitic stainless steels by reducing oversized bars or wire to the desired final size by cold drawing or other process. The degree of strain hardening achievable in any alloy is limited by its strain hardening characteristics. In addition, the amount of strain hardening that can be produced is further limited by the variables of the process, such as the total amount of cross-section reduction, die angle, and bar size. In large diameter bars, for example, plastic deformation will occur principally in the outer regions of the bar so that the increased strength and hardness due to strain hardening is achieved predominantly near the surface of the bar. That is, the smaller the bar, the greater the penetration of strain hardening. X1.2 Thus, the mechanical properties of a given strain hardened fastener are dependent not just on the alloy, but also on the size of bar from which it is machined. The minimum bar size that can be used, however, is established by the configuration of the fastener so that the configuration can affect the strength of the fastener. X1.3 For example, a stud of a particular alloy and size may be machined from a smaller diameter bar than a bolt of the same alloy and size because a larger diameter bar is required to accommodate the head of the bolt. The stud, therefore, is likely to be stronger than the same size bolt in a given alloy. X2. COATINGS AND APPLICATION LIMITS X2.1 Use of coated fasteners at temperatures above approximately one-half the melting point (Fahrenheit or Celsius) of the coating is not recommended unless consideration is given to the potential for liquid and solid metal embrittlement, or both. The melting point of elemental zinc is approximately 780 °F [415 °C]. Therefore, application of zinc-coated fasteners should be limited to temperatures less than 390 °F [210 °C]. The melting point of cadmium is approximately 600 °F [320 °C]. Therefore, application of cadmium-coated fasteners should be limited to temperatures less than 300 °F [160 °C]. SUMMARY OF CHANGES Committee A01 has identified the location of selected changes to this specification since the last issue, A193/A193M–10, that may impact the use of this specification. (Approved May 15, 2010). (1) Revised title and replaced “bolting materials” with “bolting.” Dropped definition for “bolting material” because it is in Specification A962/A962M. Updated Scope relative to supplementary requirements, use of SI units as per Guide A994, and added reference to Specification A962/A962M as indispensable for application of this specification. Dropped wording covering marking of B7M produced to prior revisions where an underline was not required. Dropped marking sections now covered by or being added to Specification A962/A962M. Committee A01 has identified the location of selected changes to this specification since the last issue, A193/A193M–09, that may impact the use of this specification. (Approved May 1, 2010). (1) Deleted the word “headed” from 10.1.1. A193/A193M – 10a 12 Committee A01 has identified the location of selected changes to this specification since the last issue, A193/A193M–08b, that may impact the use of this specification. (Approved June 1, 2009). (1) Changed marking of coated material from an asterisk ()
for zinc to “ZN” and from a plus (+) for cadmium to “CD” in
Supplementary Requirement S14.1.
(2) Deleted terms “normalized and tempered” and “air
quenched and tempered” in 3.1.1 and 7.1.1.
A193/A193M – 10a

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