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STEEL MATERIAL SUITABLE FOR USE IN SOUR ENVIRONMENT
STEEL MATERIAL SUITABLE FOR USE IN SOUR ENVIRONMENT
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机译：适用于酸环境的钢材
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摘要
A steel material having a yield strength within a range of 655 to 965 MPa (95 to 125 ksi grade), and excellent SSC resistance in a low-temperature sour environment is provided. The steel material according to the present disclosure has a chemical composition consisting of, in mass%, C: 0.20 to 0.35%, Si: 0.05 to 1.00%, Mn: 0.01 to 1.00%, P: 0.025% or less, S: 0.0100% or less, Al: 0.005 to 0.100%, Cr: 0.25 to 0.80%, Mo: 0.20 to 2.00%, Ti: 0.002 to 0.050%, B: 0.0001 to 0.0050%, N: 0.0020 to 0.0100% and O: 0.0100% or less, with the balance being Fe and impurities, and satisfying Formula (1). A number density of precipitates having an equivalent circular diameter of 400 nm or more is 0.150 particles/µm2 or less. The yield strength is within a range of 655 to 965 MPa. A dislocation density ρ is 7.0×1014 m-2 or less.
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机译：提供了一种屈服强度在655至965MPa（95至125 ksi级）的屈服强度的钢材，以及在低温酸环境中的优异SSC电阻。根据本发明的钢材具有由质量％，C：0.20至0.35％，Si：0.05至1.00％，Mn：0.01至1.00％，P：0.0100的化学组合物组成％或更少，Al：0.005至0.100％，Cr：0.25至0.80％，MO：0.20至2.00％，Ti：0.002至0.050％，B：0.0001至0.0050％，N：0.0020至0.0100％和O：0.0100％或更少，平衡是Fe和杂质，并满足式（1）。等效圆径为400nm以上的沉淀物的数密度为0.150颗粒/μm 2 或更少。屈服强度在655至965MPa的范围内。位错密度ρ为7.0×10 14 m -2 或更少。 展开▼
