Title:
TOUGH, HIGH TENSION STEEL HAVING SUPERIOR TOUGHNESS IN WELD ZONE
Document Type and Number:
Japanese Patent JPS621842
Kind Code:
A
Abstract:
PURPOSE: To improve the notch toughness of the weld heat-affected zone at low temp. by restricting the amounts of C, Si, Mn, Ti, S, P and N and distributing a product produced by secondary deoxidation and a Ti nitride-MnS composite body under prescribed conditions.
CONSTITUTION: This high tension steel consists of, by weight, 0.02W0.18% C, ≤0.5% Si, 0.4W2% Mn, 0.0007W0.005% S, ≤0.03% Ti, ≤0.015% P, ≤0.004% N and the balance Fe and contains a product of 0.1W3μm grain size produced by secondary deoxidation and a Ti nitride MnS composite body of 0.1W3μm grain size by 5×104W1×106 grains per 1mm3 each.
Inventors:
MATSUDA SHOICHI
YAMAMOTO KOICHI
HASEGAWA TOSHINAGA
YAMAMOTO KOICHI
HASEGAWA TOSHINAGA
Application Number:
JP13782185A
Publication Date:
January 07, 1987
Filing Date:
June 26, 1985
Export Citation:
Assignee:
NIPPON STEEL CORP
International Classes:
C22C38/00; C22C38/14; C22C38/54; C22C38/58; (IPC1-7): C22C38/14; C22C38/54; C22C38/58
Domestic Patent References:
| JPS59200724A | 1984-11-14 | |||
| JPS59159933A | 1984-09-10 | |||
| JPS59153840A | 1984-09-01 | |||
| JPS59153839A | 1984-09-01 | |||
| JPS5935629A | 1984-02-27 | |||
| JPS58171526A | 1983-10-08 | |||
| JPS57140858A | 1982-08-31 | |||
| JPS57140857A | 1982-08-31 | |||
| JPS57140856A | 1982-08-31 | |||
| JPS55148746A | 1980-11-19 | |||
| JPS5547366A | 1980-04-03 | |||
| JPS5541929A | 1980-03-25 |
Attorney, Agent or Firm:
Tachio Chanogi
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