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Title:
NON-HEAT TREATED STEEL PLATE EXCELLENT IN TOUGHNESS OF HIGH HEAT INPUT WELDED JOINT AND ITS MANUFACTURE
Document Type and Number:
Japanese Patent JPH03219046
Kind Code:
A
Abstract:

PURPOSE: To manufacture a non-heat treated steel plate for welding structures excellent in the toughness of a joint, at the time of working a low carbon steel having a specified compsn. into a plate material by rolling, by subjecting the steel to finish rolling at a specified surface temp. regulated in accordance with its finish plate thickness.

CONSTITUTION: A low carbon slab having a compsn. contg., by weight, 0.02 to 0.16% C, ≤0.7% Si, 0.5 to 1.6% Mn, 0.0010 to 0.0030% S, 0.010 to 0.060% Al, 0.005 to 0.012% Ti, 0.0040 to 0.0060% N and 0.0005 to 0.0015% B or furthermore contg. one or both of ≤1.00% Cu and ≤1.00% Ni as well as satisfying the inequality 1 is heated to 1000 to 1250°C. At the time of subjecting the high temp. slab to finish rolling at ≥40% draft to manufacture a steel plate, it is executed in the temp. range of 760 to A°C steel plate surface temp. [where A°C=900-(50/8) × finish plate thickness mm] in the case of ≤16mm finish plate thickness, and in the temp. range of 760 to 800°C in the case of ≥16mm plate thickness.


Inventors:
ITO AKIRA
ISHIKAWA TADASHI
HAJI TOSHIAKI
MASUNAGA HIDEKATSU
Application Number:
JP27855790A
Publication Date:
September 26, 1991
Filing Date:
October 16, 1990
Export Citation:
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Assignee:
NIPPON STEEL CORP
International Classes:
C21D8/02; C22C38/00; C22C38/14; (IPC1-7): C21D8/02; C22C38/00; C22C38/14
Domestic Patent References:
JPS58110658A1983-07-01
JPS5834131A1983-02-28
JPS6067621A1985-04-18
JPS5913022A1984-01-23
JPS5625923A1981-03-12
JPS62174324A1987-07-31
Attorney, Agent or Firm:
Kobori Masashi