According to standard DIN EN ISO 3506
| Steel group | Steel grade | Chemical composition (mass%)1) | |||||||||
| C | Si |
Mn | P | S | Cr | Mo | Ni | Cu | Notes | ||
|
Austenitic |
A1 | 0,12 | 1 | 6,5 | 0,20 | 0,15 – 0,35 |
16 – 19 |
0,7 | 5 – 10 |
1,75 – 2,25 |
2), 3), 4) |
| A2 | 0,1 | 1 | 2 | 0,05 | 0,03 | 15 – 20 |
*5) | 8 – 19 |
4 | 6), 7), 8) | |
| A3 | 0,08 | 1 | 2 | 0,045 | 0,03 | 17 – 19 |
*5) | 9 – 12 |
1 | 6), 9) | |
| A4 | 0,08 | 1 | 2 | 0,045 | 0,03 | 16 – 18,5 |
2-3 | 10 – 15 |
1 | 10), 8) | |
| A5 | 0,08 | 1 | 2 | 0,045 | 0,03 | 16 – 18,5 |
2-3 | 10,5 – 14 |
1 | 9), 10) | |
|
Martensitic |
C1 | 0,09 – 0,15 |
1 | 1 | 0,05 | 0,03 | 11,5 – 14 |
– | 1 | – | 10) |
| C3 | 0,17 – 0,25 |
1 | 1 | 0,04 | 0,03 | 16 – 18 |
– | 1,5 – 2,5 |
– | – | |
| C4 | 0,08 – 0,15 |
1 | 1,5 | 0,06 | 0,15 – 0,35 |
12 – 14 |
0,6 | 1 | – | 2), 10) | |
Ferritic |
F1 | 0,12 | 1 | 1 | 0,04 | 0,03 | 15 – 18 |
*6) | 1 | – | 11), 12) |
- Maximum value
- Sulphur may be replaced by selenium.
- If the mass fraction of nickel falls below 8%, the mass fraction of manganese must be at least 5%.
- There is no minimum limit for the mass fraction of copper if the mass fraction of nickel is more than 8%.
- A deviation regarding the molybdenum content is permissible. At the same time, for certain applications the molybdenum content must be limited. These must be stated for customers when ordering.
- A deviation regarding the molybdenum content is permissible.
- If the mass fraction of chromium falls below 17%, the mass fraction of nickel must be at least 12 %.
- For austenitic steels, with a carbon mass fraction of at most 0,03 %, nitrogen may be contained up to 0,22%.
- It must contain stabilising titanium in an amount corresponding to five times the carbon content, up to a maximum of 0,8 %, and may be supplemented according to this table, or stabilising niobium and/or tantalum in an amount corresponding to 10 times the carbon content, up to a maximum of 1 %.
- The carbon content may be higher at the manufacturer’s choice, in so far as this may be necessary at a larger diameter to achieve the specified mechanical properties, however for austenitic steels it is not more than 0,12%.
- The titanium may be in an amount of up to five times the carbon content, but may not exceed 0,8 %.
- The niobium and/or tantalum may be in an amount of up to 10 times the carbon content, but may not exceed 1 %.
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