Chemical Compositions of ACI Stainless and Heat Resisting Steel Castings Grades

Chemical composition of ACI stainless and heat-resisting steel casting grade
ASTM standards A297, A351, A743, A744 and A890 specify castings for corrosion and heat-resisting service.
These include stainless steels and some nickel based alloys. The grade designations used in these standards
are those originally developed by the ACI, the Alloy Casting Institute. (Now the Steel Founder’s Society of America).
The chemical composition of stainless steel grades covered by these standards include ACI grade designations
CA6N, CA6NM, CA15, CA15M, CA28MWV, CA40, CA40F, CB6, CB30, CB7Cu-1, CB7Cu-2, CC50, CD3MCuN, CD3MN,
CD3MWCuN, CD4MCu, CD6MN, CE20N, CE3MN, CE30, CE8MN, CF3, CF8, CF8C, CF20, CF3M, CF3MN, CF8M, CF8C,
CF10, CF10M, CF10MC, CF10SMnN, CF16F, CF16FA, CG6MMN, CG3M, CG8M, CG12, CH8, CH10, CH20, CK20,
CK3MCuN, CK35MN, CN3M, CN3MN, CN7M, CN7MSCT15C, HC, HD, HE, HF, HH, HI, HK, HK30, HK40, HL, HN, HP,
HT, HT30, HU, HW, HX. Duplex castings grades 1A, 1B, 1C, 2A, 3A, 4A, 5A, 6A are also listed and cross references
to wrought AISI grades 410, 420, 304L, 304, 347, 302, 316L, 316LN, 316, 317, 317L, 309, 310 made. Common grade
names are also cross referenced and include 17/4PH, 15/5PH, 2205, Zeron 100, Alloy 958, Escoloy 254SMO and AL-6XN

CHEMICAL COMPOSITIONS OF ACI STAINLESS AND HEAT RESISTING STEEL CASTINGS GRADES
Introduction
ASTM standards A297, A351, A743, A744 and A890 specify castings for corrosion and heat-resisting service.
The grade designations used in these standards are those originally developed by the ACI, the Alloy Casting Institute.
(Now the Steel Founder’s Society of America). These standards include the ‘C’ grades for aqueous, (wet),
corrosion service at temperatures up to 650oC and the ‘H’ grades for high temperature service at temperatures
generally over 600oC. The range of steels listed in this article includes martensitic, ferritic, precipitation hardening,
austenitic and austenitic-ferritic, (duplex), steel grades and some nickel based alloys. Where appropriate, the nearest
or related wrought grade is shown in the table.

As an alternative to scanning down the list try the ‘find’ facility on your keyboard, using the ‘Ctrl’ and ‘F’ keys together.
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The data given is not intended to replace that shown in individual standards to which reference should always be made.

Aqueous (wet) corrosion grades
Designation Chemical composition % by mass (max unless otherwise stated)
ACI No UNS No C Si Mn P S Cr Mo Ni N Cu Nb Others Wrought Grade
CA6N – 0.06 1.0 0.50 0.02 0.02 10.5/12.5 – 6.0/8.0 – – – – –
CA6NM J91540 0.06 1.0 1.0 0.04 0.04 11.5/14.0 0.4-1.0 3.5/4.5 – – – – –
CA15 J91150 0.15 1.5 1.0 0.04 0.04 11.5/14.0 0.5 1.0 – – – – 410
CA15M J91151 0.05 0.65 1.00 0.040 0.040 11.5/14.0 0.15/1.0 1.0 – – – – –
CA28MWV J91422 0.20/0.28 1.0 0.50/1.00 0.030 0.030 11.0/12.5 0.90/1.25 0.50/1.00 – – – W 0.90/1.25; V 0.20/0.30 –
CA40 J91153 0.20/0.40 1.50 1.00 0.04 0.04 11.5/14.0 0.5 1.0 – – – – 420
CA40F J91154 0.20/0.40 1.50 1.00 0.04 0.20/0.40 11.5/14.0 0.5 1.0 – – – – –
CB6 J91804 0.06 1.00 1.00 0.04 0.03 15.5/17.5 0.5 3.5/5.5 – – – – –
CB30 J91803 0.06 1.50 1.00 0.04 0.04 18.0/21.0 – 2.00 0.90/1.20 optional – – – –
CB7Cu-1 J92180 0.07 1.00 0.70 0.035 0.03 15.50/17.70 – 3.60/4.60 0.05 2.50/3.20 0.15/0.35 – 17/4PH
CB7Cu-2 J92110 0.07 1.00 0.70 0.035 0.03 14.0/15.50 – 4.50/5.50 0.05 2.50/3.20 0.15/0.35 – 15/5PH
CC50 J92615 0.50 1.50 1.00 0.04 0.04 26.0/30.0 – 4.00 – – – – –
CD3MCuN J93373 0.030 1.10 1.20 0.030 0.030 24.0/26.7 2.9/3.8 5.6/6.7 0.22/0.33 1.40/1.90 – – 1C
CD3MN J92205 0.03 1.00 1.50 0.04 0.020 21.0/23.5 2.5/3.5 4.5/6.5 0.10/0.30 1.00 – – 2205 (4A)
CD3MWCuN J93380 0.03 1.00 1.00 0.030 0.025 24.0/26.0 3.0/4.0 6.5/8.5 0.20/0.30 0.5/1.0 – W 0.5/1.0 Zeron 100 (6A)
CD4MCu J93370 0.04 1.00 1.00 0.04 0.04 24.5/26.5 1.75/2.25 4.75/6.00 – 2.75/3.25 – – 1A
CD4MCuN J93372 0.04 1.0 1.0 0.04 0.04 24.5/26.5 1.7/2.3 4.7/6.0 0.10/0.25 2.7/3.3 – – 1B
CD6MN J93371 0.06 1.00 1.00 0.040 0.040 24.0/27.0 1.75/2.5 4.0/6.0 0.15/0.25 – – – 3A
CE20N J92802 0.20 1.50 1.50 0.040 0.040 23.0/26.0 0.50 8.0/11.0 0.08/0.20 – – – –
CE3MN J93404 0.03 1.00 1.50 0.04 0.04 24.0/26.0 4.0/5.0 6.0/8.0 0.10/0.30 – – – Alloy 958 (5A)
CE30 J93423 0.30 2.00 1.50 0.04 0.04 26.0/30.0 – 8.0/11.0 – – – – –
CE8MN J93345 0.08 1.50 1.00 0.040 0.040 22.5/25.5 3.0/4.5 8.0/11.0 0.10/0.30 – – – Escoloy (2A)
CF3 J92500 0.03 2.00 1.50 0.04 0.04 17.0/21.0 – 8.0/12.0 – – – – 304L
CF8 J92600 0.08 2.00 1.50 0.04 0.04 18.0/21.0 – 8.0/11.0 – – – – 304
CF8C J92710 0.08 2.00 1.50 0.04 0.04 18.0/21.0 – 9.0/12.0 – – 8x C/1.0 – 347
CF20 J92602 0.20 2.00 1.50 0.04 0.04 18.0/21.0 – 8.00/11.0 – – – – 302
CF3M J92800 0.03 1.50 1.50 0.04 0.04 17.0/21.0 2.0/3.0 9.0/13.0 – – – – 316L
CF3MN J92804 0.03 1.50 1.50 0.040 0.040 17.0/22.0 2.0/3.0 9.0/13.0 0.10/0.20 – – – 316LN
CF8M J92900 0.08 2.00 1.50 0.04 0.04 18.0/21.0 2.0/3.0 9.0/12.0 – – – – 316
CF8C J92710 0.08 2.00 1.50 0.04 0.04 18.0/21.0 – 9.0/12.0 – – – – –
CF10 J92950 0.04/0.10 2.00 1.50 0.040 0.040 18.0/21.0 0.50 8.0/11.0 – – – – –
CF10M J92901 0.04/0.10 1.50 1.50 0.040 0.040 18.0/21.0 2.0/3.0 9.0/12.0 – – – – –
CF10MC – 0.10 1.50 1.50 0.040 0.040 15.0/18.0 1.75/2.25 13.0/16.0 – – 10xC/1.20 – –
CF10SMnN J92972 0.10 3.50/4.50 7.00/9.00 0.060 0.030 16.0/18.0 – 8.0/9.0 0.08/0.18 – – – –
CF16F J92701 0.16 2.00 1.50 0.17 0.04 18.0/21.0 1.50 9.0/12.0 – – – Se 0.20/0.35 303Se
CF16FA – 0.16 2.00 1.50 0.04 0.20/0.40 18.0/21.0 0.40/0.80 9.0/12.0 – – – – –
CG6MMN J93790 0.06 1.00 4.00/6.00 0.040 0.030 20.50/23.50 1.50/3.00 11.5/13.5 0.20/0.40 – 0.10/0.30 V 0.10/0.30 –
CG3M J92999 0.03 1.50 1.50 0.04 0.04 18.0/21.0 3.0/4.0 9.0/13.0 – – – – 317L
CG8M J93000 0.08 1.50 1.50 0.04 0.04 18.0/21.0 3.0/4.0 9.0/13.0 – – – – 317
CG12 J93001 0.12 2.00 1.50 0.04 0.04 20.0/23.0 – 10.0/13.0 – – – – –
CH8 J93400 0.08 1.50 1.50 0.040 0.040 22.0/26.0 0.50 12.0/15.0 – – – – –
CH10 J93401 0.10 2.00 1.50 0.04 0.04 22.0/26.0 – 12.0/15.0 – – – – –
CH20 J93402 0.20 2.00 1.50 0.04 2.00 22.0/26.0 – 12.0/15.0 – – – – –
CK20 J94202 0.20 2.00 2.00 0.04 0.04 23.0/27.0 – 15.0/19.0 – – – – –
CK3MCuN J93254 0.025 1.00 1.20 0.045 0.010 19.5/20.5 6.0/7.0 17.5/19.5 0.18/0.24 0.50/1.00 – – 254SMO
CK35MN – 0.035 1.00 2.00 0.035 0.020 22.0/24.0 6.0/6.8 20.0/22.0 0.21/0.32 0.40 – – –
CN3M J94652 0.03 1.0 2.0 0.03 0.03 20.0/22.0 4.5/5.5 23.0/27.0 – – – – –
CN3MN J94651 0.03 1.0 2.0 0.040 0.010 20.0/22.0 6.0/7.0 23.5/25.5 0.18/0.26 0.75 – – AL-6XN
CN7M N08007 0.07 1.50 1.50 0.04 0.04 19.0/22.0 2.0/3.0 27.5/30.5 – 3.0/4.0 – – –
CN7MS J94650 0.07 1.50 1.50 0.040 0.040 19.0/22.0 2.0/3.0 27.5/30.5 – 1.5/2.0 – – –
CT15C N08151 0.05/0.15 0.50/1.50 0.15/1.50 0.03 0.03 19.0/21.0 – 31.0/34.0 – – 0.50/1.50 – –

High temperature grades
Designation Chemical composition % by mass (max unless otherwise stated)
ACI No UNS No C Si Mn P S Cr Mo Ni N Cu Nb Others Wrought Grade
HC – 0.50 2.00 1.00 0.04 0.04 26.0/30.0 0.50 4.0/7.0 – – – – –
HD – 0.50 2.00 1.50 0.04 0.04 26.0/30.0 0.50 4.00 – – – – –
HE – 0.20/0.50 2.00 2.00 0.04 0.04 26.0/30.0 0.50 8.0/11.0 – – – – –
HF – 0.20/0.40 2.00 2.00 0.04 0.04` 18.0/23.0 0.50 8.0/12.0 – 0.50 – – 309
HH – 0.20/0.50 2.00 2.00 0.04 0.04 24.0/28.0 0.50 11.0/14.0 – – – – –
HI – 0.20/0.50 2.00 2.00 0.04 0.04 26.0/30.0 0.50 14.0/18.0 – – – – –
HK – 0.20/0.60 2.00 2.00 0.04 0.04 24.0/28.0 0.50 18.0/22.0 – – – – 310
HK30 J94203 0.25/0.35 1.75 1.50 0.040 0.040 23.0/27.0 0.50 19.0/22.0 – – – – –
HK40 J94204 0.35/0.45 1.75 1.50 0.040 0.040 23.0/27.0 0.50 19.0/22.0 – – – – –
HL – 0.20/0.60 2.00 2.00 0.04 0.04 28.0/32.0 0.50 18.0/22.0 – – – – –
HN – 0.20/0.50 2.00 2.00 0.04 0.04 19.0/23.0 0.50 23.0/27.0 – – – – –
HP – 0.35/0.75 2.50 2.00 0.04 0.04 24/28 0.50 33/37 – – – – –
HT – 0.35/0.75 2.50 2.00 0.4 0.4 15.0/19.0 0.50 33.0/37.0 – – – – –
HT30 N08030 0.25/0.35 2.50 2.00 0.040 0.040 13.0/17.0 0.50 33.0/37.0 – – – – –
HU – 0.35/0.75 2.50 2.00 0.4 0.4 17.0/21.0 0.50 37.0/41.0 – – – – –
HW – 0.35/0.75 2.50 2.00 0.4 0.4 10.0/14.0 0.50 58.0/62.0 – – – – –
HX – 0.35/0.75 2.50 2.00 0.4 0.4 15.0/19.0 0.50 64.0/68.0 – – – – –

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