熱延鋼板およびその製造方法 - Nippon Steel & Sumitomo Metal Corporation

Title:

熱延鋼板およびその製造方法

Document Type and Number:

Japanese Patent JP5126846

Kind Code:

B2

Abstract:

To provide a hot-rolled steel plate which has high-strength and excellent pitting-corrosion resistance, can be manufactured inexpensively, and accordingly is most suitable for being used particularly as a raw material of such a structural member of automobiles as to be represented by a chassis, a bumper and an undercarriage component.

The hot-rolled steel plate which has a steel composition comprising, 0.01-0.35% C, 0.01-2.0% Si, 0.1-3.0% Mn, 0.3% or less P, 0.01% or less S, 0.005-2.0% Al, 0.01% or less N, 0.01-0.25% Ti and the balance Fe with impurities; and contains 50 pieces/mm2or less by number density in total of inclusions, crystallized products and precipitates having particle sizes of 5 μm or larger, in a cross section in a sheet thickness direction of a surface layer part of the steel plate between the surface of the steel plate and a position of 50 μm deep in a sheet thickness direction.

Inventors:

Yuku Kikuchi
Hideo Mizukami
Yuichi Tsukaguchi

Application Number:

JP2008266905A

Publication Date:

January 23, 2013

Filing Date:

October 15, 2008

Export Citation:

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Assignee:

Nippon Steel & Sumitomo Metal Corporation

International Classes:

C22C38/00; B22D11/00; B22D11/108; B22D11/115; B22D11/18; B22D11/22; C21C7/076; C21D9/46; C22C38/28; C22C38/58

Domestic Patent References:

JP5195144A
JP6336641A
JP7150237A
JP4099842A
JP2007314817A

Attorney, Agent or Firm:

Shoichi Hirose

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