Chemical Composition for Austenitic Stainless Steel Fasteners
The chemical composition of the various stainless steel fastener grades are shown in Table 1. The approximate equivalent grades in other systems are shown for reference. The composition rangses are much wider in this standard than in the standard for the feedstock product, usually bar.
Table 1 Chemical composition for austenitic stainless steel fasteners
| Grade |
Chemical Composition1 (% maxima unless stated) |
Notes |
Equivalent Grade |
| C |
Si |
Mn |
P |
S |
Cr |
Mo |
Ni |
Cu |
| A1 |
0.12 |
1 |
6.5 |
0.2 |
0.15/0.35 |
16-19 |
0.7 |
5-10 |
1.75-2.25 |
2 3 4 |
303S31, 303S42, 1.4305 |
| A2 |
0.1 |
1 |
2 |
0.05 |
0.03 |
15-20 |
-5 |
8-19 |
4 |
6 7 |
304, 394S17 (BS 3111), 1.4301, 1.4567 |
| A3 |
0.08 |
1 |
2 |
0.045 |
0.03 |
17-19 |
-5 |
9-12 |
1 |
8 |
321, 1.4541, 347, 1.4550 |
| A4 |
0.08 |
1 |
2 |
0.045 |
0.03 |
16-18.5 |
2-3 |
10-15 |
4 |
7 9 |
316, 1.4401, 1.4578 |
| A5 |
0.08 |
1 |
2 |
0.045 |
0.03 |
16-18.5 |
2-3 |
10.5-14 |
1 |
8 9 |
316Ti, 1.4571, 316Cb, 1.4580 |
| C1 |
0.09-0.15 |
1 |
1 |
0.05 |
0.03 |
11.5-14 |
- |
1 |
- |
9 |
410, 1.4006 |
| C3 |
0.17-0.25 |
1 |
1 |
0.04 |
0.03 |
16-18 |
- |
1.5-2.5 |
- |
|
431, 1.4057 |
| C4 |
0.08-0.15 |
1 |
1.5 |
0.06 |
0.15-0.35 |
12-14 |
0.6 |
1 |
|
2 9 |
416, 1.4005 |
| F1 |
0.12 |
1 |
1 |
0.04 |
0.03 |
15-18 |
-10 |
1 |
|
11 12 |
430, 1.4016, 430Ti, 1.4520 430Cb, 1.4511 |
Notes
- Values are maximum unless otherwise indicated.
- Sulphur may be replaced by selenium.
- If the nickel content is below 8 %, the minimum manganese content shall be 5 %.
- There is no minimum limit to the copper content provided that the nickel content is greater than 8 %.
- Molybdenum may be present at the discretion of the manufacturer. However, if for some applications limiting of the molybdenum content is essential, this shall be stated at the time of ordering by the purchaser.
- If the chromium content is below 17 %, the minimum nickel content should be 12 %.
- For austenitic stainless steel having a maximum carbon content of 0,03 %, nitrogen may be present to a maximum of 0,22 %.
- Shall contain titanium ≥ 5 × C up to 0,8 % maximum for stabilization and be marked appropriately in accordance with this table, or shall contain niobium (columbium) and/or tantalum ≥ 10 × C up to 1,0 % maximum for stabilization and be marked appropriately in accordance with this table
- At the discretion of the manufacturer the carbon content may be higher where required in order to obtain the specified mechanical properties at larger diameters, but shall not exceed 0,12 % for austenitic steels.
- Molybdenum may be present at the discretion of the manufacturer.
- May contain titanium ≥ 5 × C up to 0,8 % maximum.
- May contain niobium (columbium) and/or tantalum ≥ 10 × C up to 1 % maximum.
Related References:
1. ISO Tolerances For Fasteners
2. Mechanical Properties for Stainless Steel Fasteners
3. Chemical Composition for Austenitic Stainless Steel Fasteners
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