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Hot rolled steel plate, cold rolled steel plate and hot dip galvanized steel plate being excellent in strain aging hardening characteristics, and method for their production

  • US 20030111144A1
  • Filed: 12/31/2001
  • Published: 06/19/2003
  • Est. Priority Date: 04/07/2000
  • Status: Active Grant
First Claim
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1. A steel sheet excellent in press-formability and in strain age hardening property as typically represented by a Δ

  • TS of 80 MPa or more, comprising a structure having ferrite phase as a main phase forming a composite structure with a secondary phase containing martensite phase in an area ratio of 2% or more.

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