High-strength hot-rolled steel shaft excellent in hole...

Details High-strength hot-rolled steel shaft excellent in hole... High-strength hot-rolled steel shaft excellent in hole...

2003-12-26

2010-11-09

Yee, Deborah (Department: 1793)

Metal treatment

Stock

Ferrous

C148S328000, C148S331000, C148S332000, C148S336000, C148S602000, C148S654000, C148S664000

Reexamination Certificate

active

07828912

ABSTRACT:
This invention provides a high-strength hot-rolled steel sheet having strength of at least 980 N/mm2at a sheet thickness of from about 1.0 to about 6.0 mm and excellent in hole expandability, ductility and ability of phosphate coating, which steel sheet is directed to automotive suspension components that are subjected to pressing. The high-strength hot-rolled steel sheet contains, in terms of a mass %, C: 0.01 to 0.09%, Si: 0.05 to 1.5%, Mn: 0.5 to 3.2%, Al: 0.003 to 1.5%, P: 0.03% or below, S: 0.005% or below, Ti: 0.10 to 0.25%, Nb:0.01 to 0.05% and the balance consisting of iron and unavoidable impurities;satisfies all of the following formulas <1> to <3>:in-line-formulae description="In-line Formulae" end="lead"?0.9≦48/12×C/Ti<1.7  <1>in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?50,227×C−4,479×Mn>−9,860  <2>in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?811×C+135×Mn+602×Ti+794×Nb>465  <3>,in-line-formulae description="In-line Formulae" end="tail"?and has strength of at least 980 N/mm2.

REFERENCES:
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Machine English translation of Japanese patent 2002-180188, Okada et al., Jun. 26, 2002.
Machine English translation of Japanese patent 2002-180189, Okada et al, Jun. 26, 2002.
Machine English translation of Japanese patent 2002-180190, Okada et al., Jun. 26, 2002.

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