HIGH-STRENGTH STEEL SHEET AND PROCESS FOR PRODUCING SAME
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United States of America Patent
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Issued Date -
Dec 22, 2016
app pub date -
Dec 26, 2014
filing date -
Jan 14, 2014
priority date (Note) -
Published
status (Latency Note)
Importance
Abstract
A high-strength steel sheet contains, by mass %, C: 0.12% to 0.40%, Si: 0% to 0.6%, Mn: more than 0% to 1.5%, Al: more than 0% to 0.15%, N: more than 0% to 0.01%, P: more than 0% to 0.02%, S: more than 0% to 0.01%, and has a martensite single-phase structure, wherein a region having a KAM value (Kernel Average Misorientation value) of 1° or more occupies 50% or more, and a maximum residual tensile stress in a surface layer region from a surface to a position at a depth of ¼ the sheet thickness is 80 MPa or less. As a result, the high-strength steel sheet excels in the resistance to delayed fracture of the cut end surface and the steel sheet base material.
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International Classification(s)
- C23C:COATING METALLIC MATERIAL; COATING MATERIAL WITH M....
- C25D:PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC ....
- C23G:CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CH....
- C21D:MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS....
- C22C:ALLOYS
- B32B:LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA....
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