High strength hot rolled steel plate excellent in...

Details High strength hot rolled steel plate excellent in... High strength hot rolled steel plate excellent in...

2001-12-07

2009-11-10

King, Roy (Department: 1793)

Metal treatment

Process of modifying or maintaining internal physical...

Heating or cooling of solid metal

C148S320000, C148S331000, C420S126000

Reexamination Certificate

active

07615126

ABSTRACT:
High strength, hot rolled steel plate providing high level of bore expandability and high level of ductility. Also, method of manufacturing same. In first aspect, steel plate comprises steel having, by mass, C:0.01-0.15%; Si:0.30-2.00%; Mn:0.50-3.00%; P≦0.03%; S≦0.005%; Ti:0.01-0.50%; and/or Ni:0.01-0.05%, with balance Fe and unavoidable impurities. In this steel, ≧80% of all grains have ratio of minor axis to major axis of ≧0.1. This steel plate has steel structure comprising ≧80% ferrite and balance bainite. In second aspect, steel plate has above composition, and ferrite-bainite duplex steel structure in which proportion of ferrite having grain diameter ≦2 μm is ≧80%. In third aspect, steel plate has above composition. wherein contents of C, Si, Mn, Ti, and Nb satisfy requirement represented by formula: 115 ≦(917−480[C %]+100[Si %]−100[Mn %])−(790×([Ti %]+[Nb %]/2)0.05)≦235. This steel plate has steel structure comprising ≧80% ferrite and balance bainite.

REFERENCES:
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Heat Treater's Guide: Practices and Procedures for Irons and Steels, “Steel quenching Technology” ASM International 1995.
Kashima et al., Zairyou to Process, vol. 12, No. 6, Sep. 1, 1999.
Kashima et al., Tetsu to Hagane, vol. 67, No. 3, Mar. 1, 2001.
Shunichi Hashimoto et al.; “Development of Nb Added Ferrite-Bainite Steels and their Automotive Application”; Sae Conference International Congress and Exposition, XX, XX; XP001183549; 1982; pp. 1166-1174.
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