| 摘要 |
PROBLEM TO BE SOLVED: To improve crack resistance in worked end parts where punching and cutting are applied to a steel sheet having tensile strength of≥980 MPa. SOLUTION: In this working method of the high strength steel sheet excellent in crack resistance, after performing punching and cutting after press-forming the steel sheet having the tensile strength of≥980 MPa and punching or cutting of 1-2,000μm from the worked end part is performed. COPYRIGHT: (C)2006,JPO&NCIPI
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