HIGH TENSION STEEL FOR AUTOMOBILE UNDERCARRIAGE COMPONENT EXCELLENT IN FORMABILITY AND TORSIONAL FATIGUE RESISTANCE, AND MANUFACTURING METHOD THEREFOR

Japanese Patent JP2011038154

A

To provide a high tension steel which is suitable for automobile structural member and has high strength, excellent formability and excellent torsional fatigue resistance after cross-sectional forming in combination, and a manufacturing method therefor.

A steel stock having the composition containing, by mass, 0.03-0.24% C, 0.021-0.044% V and further, Nb and/or Ti, is subjected to hot-rolling at higher temperature than a balanced solid-solution temperature Tv calculated from log[V][C]=-9500/Tv+6.72 (wherein, V, C are contents (mass%) of each element) to form the high tension hot-rolled steel sheet for automobile undercarriage component excellent in the formability and the torsional fatigue resistance, and further, this steel sheet is used as the stock for steel pipe, and a welded steel pipe is made through a pipe-making and welding processes.

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TOYODA SHUNSUKE
HASHIMOTO YUJI
KAWABATA YOSHIKAZU
SATO AKIO
YORIFUJI AKIRA
GUNJI MAKIO

JP2009187206A

February 24, 2011

August 12, 2009

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JFE STEEL CORP

C22C38/00; B21B3/00; B21C37/08; C21D9/46; C22C38/14; C22C38/58

JP2006312773A	2006-11-16
JP2003321747A	2003-11-14
JP2007231352A	2007-09-13
JP2007217736A	2007-08-30

Eiichi Kobayashi

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