Hot rolled steel sheet excellent in chemical convertibility...

Details Hot rolled steel sheet excellent in chemical convertibility... Hot rolled steel sheet excellent in chemical convertibility...

2004-11-04

2010-10-26

King, Roy (Department: 1793)

Alloys or metallic compositions

Ferrous

1.5 percent or more manganese containing, but less than 8...

C420S008000, C420S126000, C420S127000, C420S128000, C148S320000, C148S337000, C216S096000

Reexamination Certificate

active

07820099

ABSTRACT:
The present invention provides a high strength hot rolled steel sheet raised in Si content, wherein a conversion coating can be formed homogeneously over the entire surface of the steel sheet, no new step is added in the production of the steel sheet, and quality control is also facilitated, comprising, by mass %, C: 0.03 to 0.15%, Si: 0.8 to 3.0%, Mn: 0.5 to 3.0%, P: 0.07% or less, S: 0.01% or less, Al: 0.015 to 0.1%, N: 0.001 to 0.008%, and, if necessary, having Ti, Nb, etc. added, the oxides on the steel sheet surface having an Si concentration of 3.5% or less and an Mn concentration of 3.5% or less. Preferably, the average roughness Ra is 3.0 μm or less and the pitting due to pickling is an average of 5 or less in 10 μn side squares. The scale after the hot rolling is washed off by dipping the sheet in a solution having an HCl concentration of 7 to 15% and an Fe ion concentration of 4 to 12% at a solution temperature of 80 to 98° C. for 40 sec or more.

REFERENCES:
patent: 2003/0111144 (2003-06-01), Matsuoka et al.
patent: 2-138490 (1990-05-01), None
patent: 10-001748 (1998-01-01), None
patent: 11-050187 (1999-02-01), None
patent: 2003-155541 (2003-05-01), None
Tanahashi et al., English machine transition of JP 2003-155541A, May 30, 2003.

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