| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a high-strength steel sheet which has high strength and impact energy absorption ability both on high levels in combination, in particular, provides increased weld strength in spot welding and is suitable for a vehicle strength member. <P>SOLUTION: The high-strength steel sheet has alloy components satisfying equation: Ceq (C equivalent)=C+Mn/20+Si/40+4P+2S≥0.4 and has a slope dσ/dεof≥5,000 MPa in a stress-strain diagram in the range where true strain obtained in a tensile test is 3-7%. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
