Title:
HIGH STRENGTH STEEL SHEET AND HIGH STRENGTH ELECTROPLATED STEEL SHEET HAVING EXCELLENT DUCTILITY, STRETCH-FLANGING PROPERTY AND IMPACT ABSORBING PROPERTY AND PRODUCTION METHOD THEREFOR
Document Type and Number:
Japanese Patent JP3932892
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a high strength steel sheet and a high strength electroplated steel sheet which have a tensile strength of 400 to 540 MPa, excellent ductility and stretch-flanging properties, and excellent impact absorbing properties, and to provide a production method therefor.
SOLUTION: The steel sheets have a componential composition containing, by mass, 0.02 to 0.08% C, ≤0.50% Si, 0.5 to 1.5% Mn, ≤0.04% P, ≤0.005% S, ≤0.1% Al, and ≤0.025% N, and further containing Cr and Mo so as to satisfy Cr+1.2Mo≥0.2%, and have a structure in which the fraction of a ferritic structure as the main phase is ≥85% in an area ratio, and the ratio of a martensitic structure is 2 to 10% in an area ratio, and the total fraction of the second phase containing the above martensite is ≤15% in an area ratio.
Inventors:
Akio Toyoda
Application Number:
JP2001398712A
Publication Date:
June 20, 2007
Filing Date:
December 28, 2001
Export Citation:
Assignee:
jfe Steel Corporation
International Classes:
C21D9/46; C22C38/00; C22C38/22; C22C38/54; (IPC1-7): C22C38/00; C21D9/46; C22C38/22; C22C38/54
Domestic Patent References:
| JP2001348645A | ||||
| JP2001355042A | ||||
| JP10147838A | ||||
| JP10195588A | ||||
| JP2001207237A | ||||
| JP2001247946A | ||||
| JP9316596A | ||||
| JP2000017385A | ||||
| JP55122820A | ||||
| JP9111396A | ||||
| JP58003926A |
Attorney, Agent or Firm:
Junzo Ogawa
Morio Nakamura
Morio Nakamura
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