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Title:
PRODUCTION OF AS-ROLLED TYPE ULTRAHIGH TENSILE STRENGTH RESISTANCE WELDED TUBE FOR VEHICLE DOOR IMPACT BAR
Document Type and Number:
Japanese Patent JPH04289122
Kind Code:
A
Abstract:

PURPOSE: To produce a steel tube for door impact bar having high tensile strength and excellent in flattening test characteristics by subjecting a strip of ultrahigh tensile strength steel having respectively specified components to resistance welding and to local heat treatment.

CONSTITUTION: A steel having a composition containing, by weight, 0.1-0.2% C, 1.2-1.8% Mn, 0.2-0.5% Si, ≤0.010% S, ≤0.030% P, and ≤0.050% sol.Al is hot-rolled, cold-rolled, and subjected to heating and soaking by means of continuous heat treatment equipment and then to rapid cooling. Subsequently, the resulting ultrahigh tensile strength steel strip is subjected to resistance welding by means of resistance welded tube manufacturing equipment and the resulting seam welded zone is subjected to local heat treatment to 650-850°C.


Inventors:
OWAKI JOJI
TAKAGI HIROMI
SATO YUJI
SUGIMOTO YUJI
MORIMOTO YOSHITOSHI
TAKAMURA YOSHITOSHI
Application Number:
JP1990000418482
Publication Date:
October 14, 1992
Filing Date:
December 29, 1990
Export Citation:
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Assignee:
NIPPON KOKAN KK
International Classes:
B23K13/00; B60J5/00; B60J5/04; C21D8/02; C21D8/10; C21D9/08; C21D9/46; C21D9/50; C22C38/00; C22C38/06; (IPC1-7): B23K13/00; B60J5/04; C21D8/02; C21D8/10; C21D9/08; C21D9/46; C21D9/50; C22C38/00; C22C38/06
Domestic Patent References:
JPS61272318A1986-12-02
JPS60224717A1985-11-09
JPS5397964A1978-08-26
JPS5086442A1975-07-11