Chemical compositions of stainless steels to BS 3146-2
Introduction
BS 3146-2 is the material standard for stainless steel and some nickel based alloy castings, to be made by the investment, (or lost wax), process. Martensitic, precipitation hardening, austenitic austenitic-ferritic (duplex) grades are included. The chemical composition of the stainless steel and some nickel based alloys in the standard are listed.
Despite the advent of the European standards system, this BS is still current. See BSI Website. There is no EN standard which replaces it.
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The data given is not intended to replace that shown in individual standards to which reference should always be made.
BS 3146-2 chemical composition table
| Grade |
| Chemical composition (% by mass – max unless stated) |
|
C |
Si |
Mn |
P |
S |
Cr |
Mo |
Ni |
Others |
| Martensitic Grades |
| ANC1- A |
0.15 |
0.2/1.2 |
0.2/1.0 |
0.035 |
0.035 |
11.5/13.5 |
– |
1.0 |
– |
| ANC1- B |
0.12/0.2 |
0.2/1.2 |
0.2/1.0 |
0.035 |
0.035 |
11.5/13.5 |
– |
1.0 |
– |
| ANC1- C |
0.2/0.3 |
0.2/1.2 |
0.2/1.0 |
0.035 |
0.035 |
11.5/13.5 |
– |
1.0 |
– |
| ANC2 |
0.12/0.25 |
0.2/1.0 |
0.2/1.0 |
0.035 |
0.035 |
15.5/20.0 |
– |
1.5/3.0 |
– |
| Austenitic Grades |
| ANC3 – A |
0.12 |
0.2/2.0 |
0.2/2.0 |
0.035 |
0.035 |
17.0/20.0 |
– |
8.0/12.0 |
– |
| ANC3 – B |
0.12 |
0.2/2.0 |
0.2/2.0 |
0.035 |
0.035 |
17.0/20.0 |
– |
8.5/12.0 |
Nb 8xC/1.10 |
| ANC4 – A |
0.08 |
0.2/1.5 |
0.2/2.0 |
0.035 |
0.035 |
18.0/20.0 |
3.0/4.0 |
11.0/14.0 |
– |
| ANC4 – B |
0.08 |
0.2/1.5 |
0.2/2.0 |
0.035 |
0.035 |
17.0/20.0 |
2.0/3.0 |
10.0 min |
– |
| ANC4 – C |
0.12 |
0.2/1.5 |
0.2/2.0 |
0.035 |
0.035 |
17.0/20.0 |
2.0/3.0 |
10.0 min |
Nb 8xC/1.10 |
| ANC5 – A |
0.5 |
0.2/3.0 |
0.20/2.0 |
– |
– |
22.0/27.0 |
– |
17.0/22.0 |
– |
| ANC5 – B |
0.5 |
0.2/3.0 |
– |
– |
15.0/25.0 |
– |
36.0/46.0 |
– |
– |
| ANC5- C |
0.75 |
0.2/3.0 |
0.2/2.0 |
– |
– |
10.0/20.0 |
– |
55.0/65.0 |
– |
| ANC6 – A |
0.15/0.3 |
0.75/2.0 |
0.2/1.0 |
0.035 |
0.035 |
20.0/25.0 |
– |
10.0/15.0 |
– |
| ANC6 – B |
0.15/0.3 |
0.75/2.0 |
0.2/1.0 |
0.035 |
0.035 |
20.0/25.0 |
– |
10.0/15.0 |
W 2.5/3.5 |
| ANC6 – C |
0.05/0.15 |
0.75/2.0 |
0.2/1.0 |
0.035 |
0.035 |
20.0/25.0 |
– |
10.0/18.0 |
W 2.5/3.5 |
| Precipitation Hardening Grades |
| ANC20 A |
0.07 |
0.2/2.0 |
0.2/1.0 |
0.025 |
0.025 |
12.5/15.5 |
0.5/2.5 |
3.0/6.0 |
Cu 1.0/3.5 Nb 0.5 |
| ANC20 B |
0.07 |
0.2/2.0 |
0.2/1.0 |
0.025 |
0.025 |
12.5/15.5 |
0.5/2.5 |
3.0/6.0 |
Cu 1.0/3.5 Nb 0.5 |
| Duplex Grades |
| ANC21 |
0.05 |
0.75 |
0.75 |
0.050 |
0.050 |
25.0/27.0 |
1.75/2.25 |
4.75/6.00 |
Cu 2.75/3.25 N 0.10 |
Note
For grades ANC1, ANC3 and ANC4, where specified, the sulphur (S) level may be as high as 0.3% where free machining properties are required.
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