PRODUCTION OF AS-ROLLED TYPE ULTRAHIGH TENSILE STRENGTH RESISTANCE WELDED TUBE FOR VEHICLE DOOR IMPACT BAR

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:

JPS61272318A	1986-12-02
JPS60224717A	1985-11-09
JPS5397964A	1978-08-26
JPS5086442A	1975-07-11

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