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Chemical composition of stainless steels

Extract from ISO 683-13:1986

Steel type 2 Chemical composition (mass%)1
C max. Si max. Mn max. P max. S max. N Al Cr Mo Nb3) Ni Se min. Ti Cu Steel group code4
Ferritic steel
8 0,08 1,0 1,0 0,040 0,030 – – 16,0 – 18,0 – – 1,0 max. – – – F1
8b 0,07 1,0 1,0 0,040 0,030 – – 16,0 – 18,0 – – 1,0 max. – 7 x % C≤1,10 – F1
9c 0,08 1,0 1,0 0,040 0,030 – – 16,0 – 18,0 0,90 – 1,30 – 1,0 – max. – – – F1
F1 0,025 1,0 1,0 0,040 0,030 0,025 max – 17,0 – 19,0 1,75 – 2,50 –6 0,60 max. – –6 – F1
Martensitic steel
3 0,09-0,15 1,0 1,0 0,040 0,030 – – 11,5 – 13,5 – – 1,0 max. – – – C1
7 0,08-0,15 1,0 1,5 0,060 0,15 – 0,35 – – 12,0 – 14,0 0,60 max7 – 1,0 max. – – – C4
4 0,16-0,25 1,0 1,0 0,040 0,030 – – 12,0 – 14,0 – – 1,0 max. – – – C1
9a 0,10-0,17 1,0 1,5 0,060 0,15 – 0,35 – – 15,5 – 17,5 0,60 max7 – 1,0 max. – – – C3
9b 0,14-0,23 1,0 1,0 0,040 0,030 – – 15,0 – 17,5 – – 1,5 – 2,5 – – – C3
5 0,26-0,35 1,0 1,0 0,040 0,030 – – 12,0 – 14,0 – – 1,0 max. – – – C1
Austenitic steel
10 0,03 1,0 2,0 0,045 0,030 – – 17,0 – 19,0 – – 9,0 – 12,0 – – – A28
11 0,07 1,0 2,0 0,045 0,030 – – 17,0 – 19,0 – – 8,0 – 11,0 – – – A2
15 0,08 1,0 2,0 0,045 0,030 – – 17,0 – 19,0 – 9,0 – 12,0 – 5 x %≤0,80 – A39
16 0,08 1,0 2,0 0,045 0,030 – – 17,0 – 19,0 – 10 x % C≤1,0 9,0 – 12,0 – – – A39
17 0,12 1,0 2,0 0,060 0,15 – 0,35 – – 17,0 – 19,0 –10) – 8,0 – 10,011 – – – A1
13 0,10 1,0 2,0 0,045 0,030 – – 17,0 – 19,0 – – 11,0 – 13,0 – – – A2
19 0,03 1,0 2,0 0,045 0,030 – – 16,5 – 18,5 2,0 – 2,5 – 11,0 – 14,0 – – – A4
20 0,07 1,0 2,0 0,045 0,030 – – 16,5 – 18,5 2,0 – 2,5 – 10,5 – 13,5 – – – A4
21 0,08 1,0 2,0 0,045 0,030 – – 16,5 – 18,5 2,0 – 2,5 – 11,0-14,0 – 5 x %≤0,80 – A59
23 0,08 1,0 2,0 0,045 0,030 – – 16,5 – 18,5 2,0 – 2,5 10 x % C≤1,0 11,0 – 14,0 – – – A59
19a 0,03 1,0 2,0 0,045 0,030 – – 16,5 – 18,5 2,5 – 3,0 – 11,5 – 14,5 – – – A4
20a 0,07 1,0 2,0 0,045 0,030 – – 16,5 – 18,5 2,5 – 3,0 – 11,0 – 14,0 – – – A4
10N 0,03 1,0 2,0 0,045 0,030 0,12 – 0,22 – 17,0-19,0 – – 8,5 – 11,5 – – – A2
19N 0,03 1,0 2,0 0,045 0,030 0,12 – 0,22 – 16,5 – 18,5 2,0 – 2,5 – 10,5 – 13,5 – – – A48
19aN 0,03 1,0 2,0 0,045 0,030 0,12 – 0,22 – 16,5 – 18,5 2,5 – 3,0 – 11,5 – 14,5 – – – A48
  1. Not every possible alloying element is listed numerically in the table; where the technology requires it, the use of other alloying elements is also permitted with the customer’s consent. Care must be taken that other elements originating from scrap or from raw material used in other production do not become mixed into the steel, because these impurities may be detrimental to hardenability, mechanical properties and usability.
  2. These figures are only provisionally calculated values. International standards have not yet been defined.
  3. The amount of tantalum determines the niobium level.
  4. This is not contained in the ISO 683 : 1986 standard.
  5. (C+N) mass fraction max. 0,040 %
  6. 8 x (C+N) less than or equal to (Nb+Ti) less than or equal to 0,80 % mass fraction.
  7. At the time of requests for quotation and orders following agreement, the molybdenum content of the steel may vary between 0,20 % and 0,60 % (m/m).
  8. Excellent resistance to intergranular corrosion.
  9. Stabilised steel
  10. The manufacturer may freely choose the amount of molybdenum up to a mass fraction of 0,70 %.
  11. For the base material of seamless tubes, the maximum nickel content may be increased to a mass fraction of 0,5 %.

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