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. Type in the term you are looking for in the dialog box that then appears.
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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