Manufacture of ASTM A266, ASME SA266 Carbon Steel Forgings, Forged Bars, Flanges, Fittings, Components

Manufacturer of ASTM A-266, ASME SA-266 Carbon Steel Forging, Forged Bar, Flange, Fitting, Component
Designation: A 266/A 266M – 03a
Standard Specification for
Carbon Steel Forgings for Pressure Vessel Components1
This standard is issued under the fixed designation A 266/A 266M; 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 (e) 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 four grades of carbon steel
forgings for boilers, pressure vessels, and associated equipment.
NOTE 1—Designations have been changed as follows:
Current Formerly
Grade 1 Class 1
Grade 2 Class 2
Grade 3 Class 3
Grade 4 Class 4
1.2 Supplementary requirements are provided for use when
additional testing or inspection is desired. These shall apply
only when specified individually by the purchaser in the order.
1.3 The values stated in either inch-pound units or SI
(metric) units are to be regarded separately as the standard.
Within the text and tables, the SI units are shown in brackets.
The values stated in each system are not exact equivalents;
therefore, each system must be used independently of the other.
Combining values from the two systems may result in nonconformance
with the specification.
1.4 Unless the order specifies the applicable “M” specification
designation, the material shall be furnished to the inchpound
units.
Referenced Documents
2.1 ASTM Standards: 3
A 275/A 275M Test Method for Magnetic Particle Examination
of Steel Forgings
A 370 Test Methods and Definitions for Mechanical Testing
of Steel Products
A 788 Specification for Steel Forgings, General Requirements
E 112 Test Methods for Determining the Average Grain
Size
E 165 Test Method for Liquid Penetrant Examination
E 381 Method of Macroetch Testing Steel Bars, Billets,
Blooms, and Forgings
2.2 Other Standard:
ASME Boiler and Pressure Vessel Code, Section IX, Welding
Qualifications4
Ordering Information and General Requirements
3.1 In addition to the ordering information required by
Specification A 788, the purchaser shall include with the
inquiry and order a detailed drawing, sketch, or written
description of the forging.
3.2 Material supplied to this specification shall conform to
the requirements of Specification A 788, which outlines additional
ordering information, manufacturing requirements, testing
and retesting methods and procedures, marking, certification,
product analysis variations, and additional supplementary
requirements.
3.3 If the requirements of this specification are in conflict
with the requirements of Specification A 788, the requirements
of this specification shall prevail.
3.4 For hubbed flanges and tube sheets ordered for ASME
Boiler and Pressure Vessel Code application, Supplementary
Requirement S12 of Specification A 788 shall be specified in
addition to Supplementary Requirement S8 of this specification.
Materials and Manufacture
4.1 The steel shall be made in accordance with the Melting
Process Section of Specification A 788. A sufficient discard
shall be made to secure freedom from injurious pipe and undue
segregation.
4.2 The material shall be forged as close as practical to the
specified shape and size.
4.3 The finished product shall be a hot-worked forging as
defined by Specification A 788.
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
A01.06 on Steel Forgings and Billets.
Current edition approved Sept. 10, 2003. Published October 2003. Originally
approved in 1943. Last previous edition approved in 2003 as A 266/A 266M–03.
2 For ASME Boiler and Pressure Vessel Code applications, see related Specification
SA–266/ SA–266M 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.
4 Available from the American Society of Mechanical Engineers, 345 East 47th
St., New York, NY 10017.
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.
Machining
5.1 Surfaces shall be machined as designated by the purchaser.
Unmachined surfaces shall be sufficiently free of scale
to permit inspection.
5.2 Machining may be performed either prior to or after heat
treatment at the option of the manufacturer unless specified in
accordance with Supplementary Requirement S1.
Heat Treatment
6.1 After forging and before reheating for heat treatment,
the forgings shall be cooled in such a manner as to prevent
injury and to accomplish transformation.
6.2 All forgings shall be annealed, normalized, or normalized
and tempered, but alternatively may be liquid quenched
and tempered when mutually agreed upon between the manufacturer
and the purchaser. When tempering is performed, it
shall be at a subcritical temperature, but no less than 1100°F
[595°C].
6.3 A multiple stage austenitizing procedure may be used
whereby the forging is first fully austenitized and liquid
quenched, followed by reheating within the intercritical temperature
range to partially reaustenitize, and again liquid
quenched. On completion of the austenitizing/quenching
cycles, tempering at a temperature between 1100°F [595°C]
and the lower critical temperature shall follow.
NOTE 2—Although liquid quenching from the austenitizing temperatures
is more effective in enhancing impact properties, air cooling from the
austenitizing temperatures is also beneficial and may be used instead of
the normalizing procedure in 6.2.
Chemical Composition
7.1 Heat Analysis—The heat analysis obtained from sampling
in accordance with SpecificationA 788 shall comply with
Table 1 except that the additional features of Supplementary
Requirements S11 and S12 shall also apply as individually
specified in the ordering information.
7.2 Product Analysis—The purchaser may use the product
analysis provision of Specification A 788 to obtain a product
analysis from a forging representing each heat or multiple heat.
Mechanical Properties
8.1 General Requirements—Except when otherwise specified
in accordance with Supplementary Requirement S2, the
material shall conform to the requirements for mechanical
properties prescribed in Table 2 when tested in accordance with
the latest issue of Test Methods and Definitions A 370. The
largest obtainable tension test specimen as specified in Test
Methods and Definitions A 370 shall be used.
8.1.1 Except when otherwise specified in accordance with
Supplementary Requirement S2, the longitudinal axis of the
specimens shall be parallel to the direction of major working of
the forging. For upset-disc forgings, the longitudinal axis of the
test specimen shall be in the tangential direction.
8.1.1.1 The longitudinal axis of the specimen shall be
located midway between the parallel surfaces of the test
extension if added to the periphery of disks or midway between
the center and surface of solid forgings. For hollow forgings,
the longitudinal axis of the specimens shall be located midway
between the center and outer surfaces of the wall. When
separately forged test blocks are employed as defined in 8.1.3,
the tension test specimens shall be taken from a location that
represents the midwall of the heaviest section of the production
forgings. When specimens are required from opposite ends,
they shall be taken from the diagonal corners of an axial plane.
8.1.2 Except as specified herein, tests for acceptance shall
be made after heat treatment has been completed. When the
ends of the cylindrical forgings are closed in by reforging, the
cylindrical forgings may be annealed, normalized, or normalized
and tempered and tested prior to reforging. After reforging,
the entire forging shall be reheat-treated in the same
manner and at the same temperature range as employed when
the forging was heat-treated prior to certification testing.
8.1.3 When mutually agreed upon between manufacturer
and purchaser, test specimens may be machined from a
specially forged block suitably worked and heat treated with
the production forgings. Such a special block shall be obtained
from an ingot, slab, or billet from the same heat used to make
the forgings it represents. This block shall receive essentially
the same type of hot working and forging reduction as the
production forgings; however, a longitudinally forged bar with
dimensions not less than T by T by 3T may be used to represent
a ring forging. The dimension T shall be representative of the
heaviest effective cross section of the forging. For quenched
and tempered forgings for which tests are required at both ends
by 8.2.2.3 and 8.2.2.4, separately forged test blocks are not
allowed.
NOTE 3—In using separately forged test blocks, attention is drawn to
the effect of mass differences between the production forgings and the test
blocks.
8.2 Specific Requirements—The number and location of
tests are based on forging length, weight, and heat treatment,
and shall be as prescribed below. The length and weight to be
used for this purpose shall be the shipped length and weight of
forgings produced individually or the aggregate shipped length
and weight of all pieces cut from a multiple forging.
TABLE 1 Chemical Requirements
Composition, %
Grades 1 and 2 Grade 3 Grade 4
Carbon, max 0.30 0.35 0.30
Manganese 0.40–1.05 0.80–1.35 0.80–1.35
Phosphorus, max 0.025 0.025 0.025
Sulfur, max 0.025 0.025 0.025
Silicon 0.15–0.35 0.15–0.35 0.15–0.35
TABLE 2 Tensile Requirements
Grade 1 Grades
2 and 4
Grade 3
Tensile strength, min, ksi
[MPa]
60–85
[415–585]
70–95
[485–655]
75–100
[515–690]
Yield strength (0.2 % offset),
min, ksi [MPa]
30
[205]
36
[250]
37.5
[260]
Elongation in 2 in. or 50
mm, min, %
23 20 19
Reduction of area, min, % 38 33 30
A 266/A 266M – 03a
2
8.2.1 Annealed, Normalized, or Normalized and Tempered
Steel Forgings:
8.2.1.1 For forgings weighing 5000 lb [2250 kg] or less at
the time of heat treatment, one tension test shall be taken from
one forging per heat in each heat–treatment charge. When heat
treatment is performed in continuous-type furnaces with suitable
temperature controls and equipped with recording pyrometers
so that complete heat-treatment records are available, a
tempering charge may be considered as any continuous run not
exceeding an 8-h period.
8.2.1.2 For forgings and forged bars weighing over 5000 lb
[2250 kg] at the time of heat treatment, one tension test shall be
taken from each forging.
8.2.2 Quenched and Tempered Forgings:
8.2.2.1 For quenched and tempered forgings weighing 5000
lb [2250 kg] or less at the time of heat treatment, but not
exceeding 12 ft [3.7 m] in length, one tension test shall be
taken from one forging per heat in each heat–treatment charge.
When heat treatment is performed in continuous-type furnaces
with suitable temperature controls and equipped with recording
pyrometers so that complete heat-treatment records are available,
a tempering charge may be considered as any continuous
run not exceeding an 8-h period.
8.2.2.2 For quenched and tempered forgings and forged bars
weighing over 5000 lb [2250 kg] to 10 000 lb [4500 kg] at the
time of heat treatment, but not exceeding 12 ft [3.7 m] in
length, one tension test shall be taken from each forging.
8.2.2.3 For quenched and tempered forgings and forged bars
that exceed 12 ft [3.7 m] in length, one tension test shall be
taken from each end of each forging.
8.2.2.4 For quenched and tempered forgings and forged bars
weighing more than 10 000 lb [4500 kg] at the time of heat
treatment, two tension test specimens shall be taken from each
forging. These shall be offset 180° from each other except that
if the length of the forging, excluding test prolongations,
exceeds 12 ft [3.7 m], then one specimen shall be taken from
each end of the forging.
Repair Welding
9.1 Repair welding of forgings is permissible only at the
option of the purchaser. If repair welding is performed, welders
and weld procedures shall be qualified in accordance with
Section IX of the ASME Boiler and Pressure Vessel Code.
Certification
10.1 In addition to the mandatory certification requirements
of Specification A 788, the heat treatment cycle data shall be
included.
Product Marking
11.1 Each forging shall be identified in accordance with the
Marking Section of Specification A 788. In addition, the
forging shall be marked following the grade designation by the
letter “A” for annealed, “N” for normalized, “NT” for normalized
and tempered, and “S” for liquid quenched and tempered,
as applicable.
Keywords
12.1 pressure vessel service; steel forgings—carbon
SUPPLEMENTARY REQUIREMENTS
One or more of the following supplementary requirements shall apply only when specified by the
purchaser in the inquiry, contract, or order. Details of these supplementary requirements shall be
agreed upon between the manufacturer and the purchaser.
S1. Rough Turning and Boring
S1.1 The position of the rough turning and boring in the
sequence of manufacturing operations shall be as specified by
the purchaser.
S2. Alternative Tension Test Orientation
S2.1 In lieu of the requirements of Section 8, the longitudinal
axis of the test specimens shall be transverse to the
direction of major working of the forging. The results shall
conform with requirements of Table 2, with the exception of
the ductility limits that shall be as follows:
Grade 1 2 and 4 3
Elongation in 2 in. [50 mm], min, % 20 19 18
Reduction of area, min, % 30 25 25
S3. Hydrostatic Test
S3.1 A hydrostatic pressure test shall be applied. The details
of the test, including its position in the sequence of manufacturing
operations, shall be specified.
S4. Magnetic Particle Examination
S4.1 All accessible surfaces of the finished forging shall be
examined by a magnetic particle method. The method shall be
in accordance with Test Method A 275/A 275 M. Acceptance
limits shall be as agreed upon between the manufacturer and
the purchaser.
S5. Liquid Penetrant Examination
S5.1 After forgings have been heat treated by liquid quenching
and tempering, all accessible surfaces shall be inspected for
quench cracks by the liquid penetrant method in accordance
with Test Method E 165 as an alternative to magnetic particle
examination.
S6. Macroetch Test
S6.1 A sample forging shall be sectioned and etched to
show flow lines and internal imperfections. The test shall be
conducted in accordance with Method E 381. Details of the test
shall be agreed upon between the manufacturer and the
purchaser.
A 266/A 266M – 03a
3
S7. Product Analysis
S7.1 A product analysis in accordance with Section 7 shall
be made from one randomly selected forging representing each
size and shape of forging on the order. If the analysis fails to
comply, each forging shall be checked or the lot rejected. All
results shall be reported to the purchaser.
S8. Specimen Location on Forged Hubs
S8.1 Forged hubs to be butt-welded to shells shall be forged
in such a manner as to provide in the hub the full minimum
tensile strength and elongation specified for the material, in a
direction parallel to the axis of the vessel. A tension specimen
(subsize if necessary) shall be taken in this direction and as
close to the finished hub outside diameter as practical.
S9. Hardness
S9.1 The purchaser may check the Brinell hardness of the
forging at any location on the surface of the forging, and the
hardness shall be within the following limits:
Grade Brinell Hardness Limits
1 121 to 170
2 and 4 137 to 197
3 156 to 207
S10. Grain Size
S10.1 The austenitic grain size of the steel shall be 1 to 5 as
determined using Test Methods E 112.
S11. Restriction on Residual Elements (Applicable to
Heat Analysis)
S11.1 Nickel, chromium, and molybdenum shall be determined
and shall not exceed the following limits:
Nickel 0.25 % max
Chromium 0.20 % max
Molybdenum 0.08 % max
S12. Restriction on Carbon (Applicable to Grade I)
S12.1 The carbon content shall be 0.30 % max.
S13. Impact Tests
S13.1 Charpy impact tests shall be made. The number and
location of the tests, minimum properties, and test temperatures
shall be specified.
S13.2 The specimens shall be machined and tested in
accordance with Test Methods and Definitions A 370.
S13.3 Retests may be conducted in accordance with Section
10 of Specification A 788.
S14. Individual Forging
S14.1 Forgings, whether identical or not, shall be pro-duced
individually. They shall not be forged in multiples and separated
prior to or after heat treatment.
S14.2 The shape and size of individual forgings shall be
agreed upon between the manufacturer and the purchaser by
means of a forging drawing or the purchase order.
S15. Carbon Equivalancy
S15.1 The heat analysis including the residual element
restrictions of S1 in Specification A 788 shall be limited such
that the carbon equivalent shall not exceed 0.45 for Grade 1 or
0.50 for Grade 2 or 4 when calculated in accordance with the
following formula:
CE 5 % C 1
%Mn
6 1
% Cr 1%Mo 1%V
5 1
%Ni 1 % Cu
15
SUMMARY OF CHANGES
Committee A01 has identified the location of the following changes to this standard since A 266/A 266-03 that
may impact the use of this standard.
(1) Added mandatory supplementary requirement reference to
ordering information.
A 266/A 266M – 03a

Inspection & Approval Certificates : C/W Certificate (Calibration Works Certificate) EN-10204 3.1 / DIN-50049 3.1 / ISO-10474 3.1 Mill Test Certificate,
ISI Mark, BIS Certified, NACE HIC TM-0284 / NACE MR-0103 / NACE MR-0175 / ISO 15166, CE Marking, PED Certified, PED Approved,
European Pressure Equipment Directive PED-2014/68/EU, AD-2000-WO, ASME Boiler & Pressure Vessel Code Section-II Plate A Edition 2019,
API 6A (American Petroleum Institute), ISO 9001 Certified, NADCAP Certified, EN9100 Certified, AS9100 Certified with EN 10204 3.2 Certificate
duly Certified & Approved by IBR (Indian Boiler Regulations), LR Class (Lloyd’s Register), GL (Germanischer Lloyd), BV (Bureau Veritas),
DNV (Det Norske Veritas), ABS Class (American Bureau of Shipping), SGS, TUV, RINA, IR Class (Indian Register of Shipping),
NORSOK Approved Standard M-630, M-650 Rev.3

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