High tensile hot rolled steel sheet excellent in shape...

Details High tensile hot rolled steel sheet excellent in shape... High tensile hot rolled steel sheet excellent in shape...

2008-03-25

2008-03-25

Yee, Deborah (Department: 1793)

Metal treatment

Stock

Ferrous

C420S128000

Reexamination Certificate

active

10479773

ABSTRACT:
According to the invention, a high-strength hot rolled steel sheet having an excellent shape fixability as hot-rolled and an excellent fatigue durability after the forming, excellent weldability and phosphatability and a tensile strength of not less than 590 MPa level can be obtained by comprising C: not less than 0.02 mass % but not more than 0.2 mass %, Si: not less than 0.5 mass % but not more than 2.0 mass %, Mn: not less than 1.0 mass % but not more than 3.0 mass %, Al: not less than 0.01 mass % but not more than 0.1 mass %, N: not less than 0.002 mass % but not more than 0.006 mass %, P: not more than 0.03 mass %, S: not more than 0.01 mass % and solid-soluted (C+N): not less than 0.0010 mass % and the reminder being Fe and inevitable impurities, and having a steel structure that a primary phase is ferrite and a secondary phase is martensite phase of 5-30 % at a volume ratio and a total of both is not less than 95 % as a volume ratio, and further having an average crystal grain size of ferrite of not more than 8 μm.

REFERENCES:
patent: 4502897 (1985-03-01), Morita et al.
patent: 6425963 (2002-07-01), Kaneko et al.
patent: 1263168 (2000-08-01), None
patent: 410053837 (1998-02-01), None
patent: 11350064 (1999-12-01), None
patent: 2000 297349 (2000-10-01), None

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