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CN102037148B 高强度钢板及高强度钢板用钢液的熔炼方法 有权 转让

高强度钢板及高强度钢板用钢液的熔炼方法
摘要：
该高强度钢板以质量％计包含C：0.03～0.20％、Si：0.08～1.5％、Mn：0.5～3.0％、P：0.05％以下、S：0.0005％以上、酸可溶Ti：0.008～0.20％、N：0.0005～0.01％、酸可溶Al：超过0.01％、Ce或La中的1种或2种的总计：0.001～0.04％、以及余量的铁及不可避免的杂质，进而，以质量基准计，(Ce+La)/酸可溶Al≥0.1、且(Ce+La)/S为0.4～50，在该钢板中存在的当量圆直径为2μm以下的夹杂物的个数密度为15个/mm2以上。
摘要（英）：

A high-strength steel sheet includes: 0.03 to 0.20% of C, 0.08 to 1.5% of Si, 0.5 to 3.0% of Mn, 0.05% or less of P, 0.0005% or more of S, 0.008 to 0.20% of acid-soluble Ti, 0.0005 to 0.01 % ofN, more than 0.01% of acid-soluble Al, and 0.001 to 0.04% of one or both of Ce and La in terms of mass%; and the balance including Fe and inevitable impurities. The ratio of (Ce+La)/acid-soluble Al is equal to or more than 0.1 and the ratio of (Ce+La)/S is in the range of 0.4 to 50 in a mass base, and the density of the number of inclusions, having a circle equivalent diameter of 2 µm or less, which are present in the steel sheet is equal to or more than 15/mm 2 .

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