Chemical composition of stainless steels to BS 3100
Introduction
BS 3100, Steel castings for general engineering purposes, was published in 1991 and covers a wide range of steel casting grades. These include the stainless steels in the following tables. Some of these grades are similar to grades published more recently in BS EN 10283, as European grades, but BS 3100 uses the ‘traditional’ BS grade designation types. This table should be useful in identifying some of the older ‘BS’ castings grades.
BS EN 10283 does not supersede BS3100 as this also includes non-stainless steel casting grades.
Only the chemical compositions of the stainless steels in BS3100 are listed. Grades shown with a suffix ‘LT 196’ are intended for low temperature applications and are required to pass a Charpy impact test at -196 C by the standard.
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.
BS 3100 chemical composition table
| Grade |
| Chemical composition % by mass (max unless otherwise stated) |
| C |
Si |
Mn |
P |
S |
Cr |
Mo |
Ni |
Others |
| 410C21 |
0.15 |
1.0 |
1.0 |
0.040 |
0.040 |
11.5/13.5 |
– |
1.00 |
Cu 0.30 |
| 420C28 |
0.20 |
1.0 |
1.0 |
0.040 |
0.040 |
11.5/13.5 |
– |
1.00 |
Cu 0.30 |
| 420C29 |
0.20 |
1.0 |
1.0 |
0.040 |
0.040 |
11.5/13.5 |
– |
1.00 |
Cu 0.30 |
| 425C12 |
0.06 |
1.0 |
1.0 |
0.040 |
0.030 |
11.5/14.0 |
0.40/1.0 |
3.5/4.5 |
– |
| 425C11 |
0.10 |
1.0 |
1.0 |
0.040 |
0.030 |
11.5/13.5 |
0.60 |
3.4/4.2 |
– |
| 302C25 |
0.12 |
1.5 |
2.0 |
0.040 |
0.040 |
17.0/21.0 |
– |
8.0 min |
– |
| 304C12 |
0.03 |
1.5 |
2.0 |
0.040 |
0.040 |
17.0/21.0 |
– |
8.0/12.0 |
– |
| 304C12 LT196 |
0.03 |
1.5 |
2.0 |
0.040 |
0.040 |
17.0/21.0 |
– |
8.0/12.0 |
– |
| 304C15 |
0.08 |
1.5 |
2.0 |
0.040 |
0.040 |
18.0/21.0 |
– |
8.0/11.0 |
– |
| 304C15 LT196 |
0.08 |
1.5 |
2.0 |
0.040 |
0.040 |
18.0/21.0 |
– |
8.0/11.0 |
– |
| 347C17 |
0.08 |
1.5 |
2.0 |
0.040 |
0.040 |
18.0/21.0 |
– |
9.0/12.0 |
Nb 8xC/1.0 |
| 316C12 |
0.03 |
1.5 |
2.0 |
0.040 |
0.040 |
17.0/21.0 |
2.0/3.0 |
9.0 min |
– |
| 316C12 LT196 |
0.03 |
1.5 |
2.0 |
0.040 |
0.040 |
17.0/21.0 |
2.0/3.0 |
9.0 min |
– |
| 316C16 |
0.08 |
1.5 |
2.0 |
0.040 |
0.040 |
17.0/21.0 |
2.0/3.0 |
9.0 min |
– |
| 316C16 LT196 |
0.08 |
1.5 |
2.0 |
0.040 |
0.040 |
17.0/21.0 |
2.0/3.0 |
9.0 min |
– |
| 317C16 |
0.08 |
1.5 |
2.0 |
0.040 |
0.040 |
17.0/21.0 |
3.0/4.0 |
9.0 min |
– |
| 318C17 |
0.08 |
1.5 |
2.0 |
0.040 |
0.040 |
17.0/21.0 |
2.0/3.0 |
9.0 min |
Nb 8xC/1.00 |
| 332C11 |
0.07 |
1.5 |
1.5 |
0.040 |
0.040 |
19.0/22.0 |
2.0/3.0 |
27.5/30.5 |
Cu 3.0/4.0 |
| 332C13 |
0.04 |
1.0 |
1.0 |
0.040 |
0.040 |
24.5/26.5 |
1.75/2.25 |
4.75/6.00 |
Cu 2.75/3.25 |
| 332C15 |
0.08 |
1.5 |
1.5 |
0.040 |
0.040 |
21.0/27.0 |
1.75/3.00 |
4.0/7.00 |
N 0.10/0.25 |
| 420C24 |
0.25 |
2.0 |
1.0 |
0.050 |
0.050 |
12.0/16.0 |
– |
– |
– |
| 452C11 |
1.00 |
2.0 |
1.0 |
0.050 |
0.050 |
25.0/30.0 |
1.5 |
4.0 |
– |
| 452C12 |
1.0/2.0 |
2.0 |
1.0 |
0.050 |
0.050 |
25.0/30.0 |
1.5 |
4.0 |
– |
| 302C35 |
0.2/0.4 |
2.0 |
2.0 |
0.050 |
0.050 |
17.0/22.0 |
1.5 |
6.0/10.0 |
– |
| 309C30 |
0.5 |
2.5 |
2.0 |
0.050 |
0.050 |
22.0/27.0 |
1.5 |
10.0/14.0 |
– |
| 309C40 |
0.5 |
2.0 |
2.0 |
0.050 |
0.050 |
25.0/30.0 |
1.5 |
8.0/12.0 |
– |
| 310C45 |
0.5 |
3.0 |
2.0 |
0.050 |
0.050 |
22.0/27.0 |
1.5 |
17.0/22.0 |
– |
| 311C11 |
0.5 |
3.0 |
2.0 |
0.050 |
0.050 |
17.0/23.0 |
1.5 |
23.0/28.0 |
– |
| 330C12 |
0.75 |
3.0 |
2.0 |
0.050 |
0.050 |
13.0/20.0 |
1.5 |
30.0/40.0 |
– |
| 331C60 |
0.75 |
3.0 |
2.0 |
0.050 |
0.050 |
15.0/25.0 |
1.5 |
36.0/46.0 |
– |
| 334C11 |
0.75 |
3.0 |
2.0 |
0.050 |
0.050 |
10.0/20.0 |
1.5 |
55.0/65.0 |
– |
| 309C32 |
0.20/0.45 |
1.5 |
2.5 |
0.040 |
0.040 |
24.0/28.0 |
1.5 |
11.0/14.0 |
N 0.20 |
| 309C35 |
0.20/0.50 |
1.5 |
2.0 |
0.040 |
0.040 |
24.0/28.0 |
1.5 |
11.0/14.0 |
– |
| 310C40 |
0.30/0.50 |
1.5 |
2.0 |
0.040 |
0.040 |
24.0/27.0 |
1.5 |
19.0/22.0 |
– |
| 330C11 |
0.35/0.55 |
1.5 |
2.0 |
0.040 |
0.040 |
13.0/17.0 |
1.5 |
33.0/37.0 |
– |
| 331C40 |
0.35/0.55 |
1.5 |
2.0 |
0.040 |
0.040 |
17.0/21.0 |
1.5 |
37.0/41.0 |
– |
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