Low-nickel austenitic stainless steel
AssigneeOutokumpu Oyj
InventorsJuho Talonen, Suresh Kodukula, Tero Taulavuori
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Abstract
The invention relates to a low-nickel austenitic stainless steel with high resistance to delayed cracking and the use of the steel. The steel contains in weight % 0.02-0.15% carbon, 7-15% manganese, 14-19% chromium, 0.1-4% nickel, 0.1-3% copper, 0.05-0.3% nitrogen, the balance of the steel being iron and inevitable impurities, and the chemical composition range in terms of the sum of carbon and nitrogen contents (C+N) and the measured Md3o-temperature is inside the area defined by the points ABCD which have the following values Point Md30° C. C+N % A−80 0.1 B+7 0.1 C−40 0.40 D−80 0.40.
Claims10
Low-nickel austenitic stainless steel with high resistance to delayed cracking wherein the steel contains in weight % 0.02-0.15% carbon, 7-15% manganese, 14-19% chromium, 0.1-4% nickel, 0.1-3% copper, 0.05-0.35% nitrogen, the balance of the steel being iron and inevitable impurities, and a drawing ratio at least 2.0 in deep drawing is achieved to the steel without occurrence of delayed cracking, and the combination of the sum of carbon and nitrogen contents (C+N) and the austenite stability determined by experimentally measured Md30-temperature of the steel is inside the area defined by the points ABCD which have the following values
- Point
- Md30 ° C.
- C + N %
- A
- −80
- 0.1
- B
- +7
- 0.1
- C
- −40
- 0.40
- D
- −80
- 0.40.
Dependencies are inferred from the claim text.