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US 2014/0348695 A1Published application
Low alloy steel
AssigneeNippon Steel & Sumitomo Metal Corporation
InventorsHiroyuki Hirata, Kenji Kobayashi, Tomohiko Omura, Kaori Kawano, Kota Tomatsu, Kazuhiro Ogawa
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Abstract
A low alloy steel, containing, by mass percent, C: 0.01 to 0.15%, Si: 3% or less, Mn: 3% or less, B: 0.005 to 0.050%, and Al: 0.08% or less, and the balance being Fe and impurities, wherein in the impurities, N: 0.01% or less, P: 0.05% or less, S: 0.03% or less, and O: 0.03% or less. In the alloy steel, a HAZ has excellent resistance to embrittlement attributable to hydrogen such as stress corrosion cracking in wet hydrogen sulfide environments.
Claims16
A low alloy steel, containing, by mass percent,
- C:
- 0.01 to 0.15%, Si:
- 3% or less,
- Mn:
- 3% or less,
- B:
- 0.005 to 0.050%, and
- Al:
- 0.08% or less, and
- the balance being Fe and impurities,
- wherein in the impurities,
- N:
- 0.01% or less,
- P:
- 0.05% or less,
- S:
- 0.03% or less, and
- O:
- 0.03% or less.
16 more elements
Dependencies are inferred from the claim text.