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Standard

Chemical Composition of ACI Heat Resisting Stainless Steel






ASTM standard ASTM A297, ASTM A351, ASTM A743, ASTM A744 and ASTM A890 specify castings for corrosion and heat-resisting service. The grade designations used in these standard 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 650 C and the 'H' grades for high temperature service at temperature generally over 600 C. The range of steels listed in this article includes martensitic, ferritic, precipitation hardening, austenitic and austenitic-ferritic (duplex stainless steel) grades and some nickel based alloys. Where appropriate, the nearest or related wrought grade is shown in the table.

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 Grade
CA6N - 0.06 1.0 0.50 0.02 0.02 10.5
/12.5		 - 6.0
/8.0		 - - - - -
CA6
NM		 J91
540		 0.06 1.0 1.0 0.04 0.04 11.5
/14.0		 0.4-1.0 3.5
/4.5		 - - - - -
410 J91
150		 0.15 1.5 1.0 0.04 0.04 11.5
/14.0		 0.5 1.0 - - - - 410
CA1
5M		 J91
151		 0.05 0.65 1.00 0.040 0.040 11.5
/14.0		 0.15
/1.0		 1.0 - - - - -
CA28
MWV		 J91
422		 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		 -
420 J91
153		 0.20
/0.40		 1.50 1.00 0.04 0.04 11.5
/14.0		 0.5 1.0 - - - - 420
CA40F J91
154		 0.20
/0.40		 1.50 1.00 0.04 0.20
/0.40		 11.5
/14.0		 0.5 1.0 - - - - -
CB6 J91
804		 0.06 1.00 1.00 0.04 0.03 15.5
/17.5		 0.5 3.5
/5.5		 - - - - -
CB30 J91
803		 0.06 1.50 1.00 0.04 0.04 18.0
/21.0		 - 2.00 0.90
/1.20		 - - - -
CB7Cu-1 J92
180		 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
CB7
Cu-2		 J92
110		 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 J92
615		 0.50 1.50 1.00 0.04 0.04 26.0
/30.0		 - 4.00 - - - - -
CD3M
CuN		 J93
373		 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
CD3
MN		 J92
205		 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)
CD3M
WCuN		 J93
380		 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
CD4
MCu		 J93
370		 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
CD4M
CuN		 J93
372		 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
CD6
MN		 J93
371		 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
CE2
0N		 J92
802		 0.20 1.50 1.50 0.040 0.040 23.0
/26.0		 0.50 8.0
/11.0		 0.08
/0.20		 - - - -
CE3
MN		 J93
404		 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
CE30 J93
423		 0.30 2.00 1.50 0.04 0.04 26.0
/30.0		 - 8.0
/11.0		 - - - - -
CE8
MN		 J93
345		 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
CF3 J92
500		 0.03 2.00 1.50 0.04 0.04 17.0
/21.0		 - 8.0
/12.0		 - - - - 304L
CF8 J92
600		 0.08 2.00 1.50 0.04 0.04 18.0
/21.0		 - 8.0
/11.0		 - - - - 304
CF8C J92
710		 0.08 2.00 1.50 0.04 0.04 18.0
/21.0		 - 9.0
/12.0		 - - 8x C
/1.0		 - 347
CF20 J92
602		 0.20 2.00 1.50 0.04 0.04 18.0
/21.0		 - 8.00
/11.0		 - - - - 302
CF3M J92
800		 0.03 1.50 1.50 0.04 0.04 17.0
/21.0		 2.0
/3.0		 9.0
/13.0		 - - - - 316L
CF3
MN		 J92
804		 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 J92
900		 0.08 2.00 1.50 0.04 0.04 18.0
/21.0		 2.0
/3.0		 9.0
/12.0		 - - - - 316
CF8C J92
710		 0.08 2.00 1.50 0.04 0.04 18.0
/21.0		 - 9.0
/12.0		 - - - - -
CF10 J92
950		 0.04
/0.10		 2.00 1.50 0.040 0.040 18.0
/21.0		 0.50 8.0
/11.0		 - - - - -
CF1
0M		 J92
901		 0.04
/0.10		 1.50 1.50 0.040 0.040 18.0
/21.0		 2.0
/3.0		 9.0
/12.0		 - - - - -
CF1
0MC		 - 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		 - -
CF10
S
MnN		 J92
972		 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 J92
701		 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
CF1
6FA		 - 0.16 2.00 1.50 0.04 0.20
/0.40		 18.0
/21.0		 0.40
/0.80		 9.0
/12.0		 - - - - -
CG6
MMN		 J93
790		 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 J92
999		 0.03 1.50 1.50 0.04 0.04 18.0
/21.0		 3.0
/4.0		 9.0
/13.0		 - - - - 317L
CG8M J93
000		 0.08 1.50 1.50 0.04 0.04 18.0
/21.0		 3.0
/4.0		 9.0
/13.0		 - - - - 317
CG12 J93
001		 0.12 2.00 1.50 0.04 0.04 20.0
/23.0		 - 10.0
/13.0		 - - - - -
CH8 J93
400		 0.08 1.50 1.50 0.040 0.040 22.0
/26.0		 0.50 12.0
/15.0		 - - - - -
CH10 J93
401		 0.10 2.00 1.50 0.04 0.04 22.0
/26.0		 - 12.0
/15.0		 - - - - -
CH20 J93
402		 0.20 2.00 1.50 0.04 2.00 22.0
/26.0		 - 12.0
/15.0		 - - - - -
CK20 J94
202		 0.20 2.00 2.00 0.04 0.04 23.0
/27.0		 - 15.0
/19.0		 - - - - -
CK3M
CuN		 J93
254		 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
CK3
5MN		 - 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 J94
652		 0.03 1.0 2.0 0.03 0.03 20.0
/22.0		 4.5
/5.5		 23.0
/27.0		 - - - - -
CN3
MN		 J94
651		 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 N08
007		 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		 - - -
CN7
MS		 J94
650		 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		 - - -
CT1
5C		 N08
151		 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 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 - - - - -

Related References:
1. Chemical Composition of AISI and UNS Austenitic Stainless Steel
2. Chemical Composition of ACI Heat Resisting Stainless Steel
3. Chemical Composition of AISI and UNS Ferritic Stainless Steel
4. Chemical Composition of AISI and UNS Duplex Stainless Steel
5. Chemical Composition of AISI and UNS Heat Resisting Stainless Steel
6. Chemical Composition of AISI and UNS Martensitic and Precipitation Hardening

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