Disclosed is a high-strength steel sheet having a tensile strength of 1180 MPa or more and having satisfactory seam weldability. The steel sheet has a chemical composition of C: 0.12% to 0.40%, Si: 0.003% to 0.5%, Mn 0.01% to 1.5%, Al: 0.032% to 0.15%, N: 0.01% or less, P: 0.02% or less, S: 0.01% or less, Ti: 0.01% to 0.2% or less, and B: 0.0001% to 0.01%, with the remainder including iron and inevitable impurities, has a Ceq1 (=C+Mn/5+Si/13) of 0.50% or less, and has a steel structure of a martensite single-phase structure.
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机译：公开了一种抗拉强度为1180MPa以上且缝焊性良好的高强度钢板。钢板的化学组成为C：0.12％至0.40％，Si：0.003％至0.5％，Mn 0.01％至1.5％，Al：0.032％至0.15％，N：0.01％以下，P：0.02％ S：0.01％以下，Ti：0.01％以下至0.2％以下，B：0.0001％以上至0.01％以下，其余含有铁和不可避免的杂质，其Ceq1（＝ C + Mn / 5 + Si / 13）为0.50％以下，具有马氏体单相组织的钢结构。
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