STEEL PLATE HAVING LOW WELDING STRAIN AND GOOD BENDING WORKABILITY BY LINEAR HEATING AND METHOD FOR PRODUCING THE SAME, AND WELDING MATERIAL AND METHOD FOR PRODUCING THE SAME

Title:

STEEL PLATE HAVING LOW WELDING STRAIN AND GOOD BENDING WORKABILITY BY LINEAR HEATING AND METHOD FOR PRODUCING THE SAME, AND WELDING MATERIAL AND METHOD FOR PRODUCING THE SAME

Document Type and Number:

WIPO Patent Application WO1995008655

Kind Code:

A1

Abstract:

Steel material is specified to contain, by weight percentage, C (0.02-0.25 %), Si (0.01-2.0 %), Mn (0.30-1.5 %), Al (0.003-0.10 %), Nb (0.005-0.10 %), Mo (0.05-1.00 %), and the remaining portion constituting Fe and inevitable impurities to produce a steel plate, 3 to 100 mm thick (in particular, in a case where the plate thickness ranges from 3 to 25 mm, the upper limit of Nb and Mo should be 0.025 %, respectively), and, as its yield stress, a ratio of the yield stress sigma yT of the steel plate at a temperature T to the yield stress sigma y of the same at a room temperature is specified to fall within the range of the following formula over the room temperature to 600 DEG C: 1.00-1.083x10<-3>T<( sigma yT/ sigma y)<1.16-5.101x10<-4>T. Furthermore, the constituents of welding material are specified, and a transformation temperature gamma 3 is set to less than 620 DEG C and as the yield stress of its deposited metal a ratio of the yield stress sigma y0T0 of the deposited metal at a temperature T0 to the yield stress sigma y0 of the same at a room temperature is specified to fall within the range of the following formula over the room temperature to 600 DEG C: 1.00-1.083x10<-3>T0<( sigma y0T0/ sigma y0)<1.16-5.101x10<-4>T0. The above steel plate is welded by the above welding material so as to provide a welded steel plate having small welding strain.

Inventors:

YOSHIE ATSUHIKO (JP)
FUJITA TAKASHI (JP)
KAWASHIMA YOKIMI (JP)
NAGAHARA MASAAKI (JP)
KOJIMA KAZUHIRO (JP)
KASUYA TADASHI (JP)
HORII YUKIHIKO (JP)
YOSHIMURA TSUKASA (JP)

Application Number:

PCT/JP1994/001549

Publication Date:

March 30, 1995

Filing Date:

September 20, 1994

Export Citation:

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Assignee:

NIPPON STEEL CORP (JP)
YOSHIE ATSUHIKO (JP)
FUJITA TAKASHI (JP)
KAWASHIMA YOKIMI (JP)
NAGAHARA MASAAKI (JP)
KOJIMA KAZUHIRO (JP)
KASUYA TADASHI (JP)
HORII YUKIHIKO (JP)
YOSHIMURA TSUKASA (JP)

International Classes:

B23K35/30; B23K35/36; C21D8/02; C22C38/04; (IPC1-7): C22C38/12; C22C38/54; C21D8/02; B23K9/16; B23K9/23; B23K35/30; B23K35/368

Foreign References:

JPS537372B2	1978-03-17
JPS62142726A	1987-06-26
JPS5329219A	1978-03-18
JPS51126320A	1976-11-04
JPS6233093A	1987-02-13
JPS6233094A	1987-02-13
JPS61286089A	1986-12-16

Other References: