Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
HIGH TENSILE STRENGTH STEEL EXCELLENT IN TOUGHNESS OF WELD ZONE AND ITS PRODUCTION
Document Type and Number:
Japanese Patent JP3736209
Kind Code:
B2
Abstract:

PROBLEM TO BE SOLVED: To provide a method for producing steel stably excellent in CTOD characteristics at ≤-40°C in the multilayer build-up weld zone of small-medium heat input.
SOLUTION: A continuously cast slab contg., by weight, 0.01 to 0.10% C, 0.01 to 0.10% Si, 1.0 to 2.0% Mn, ≤0.005% S, ≤1.0% Cu, ≤2.0% Ni, ≤0.025% sol.Al, ≤0.0030% N, 0.005 to 0.025% Ti and ≤0.0005% B, moreover contg. one or more kinds of Ca and rare earth metals or one or ≥ two kinds among Cr, Mo, V and Nb, and the balance substantial Fe is heated at 1050 to 1250°C, is next subjected to hot rolling of ≥25% cumulative draft in the temp. range of ≤900°C, is immediately cooled to ≤550°C at a cooling rate of 1 to 50°C/sec and is then subjected to aging treatment at 500°C to Ac1.


Inventors:
橋本 正幸
阿部 隆
高橋 和秀
塚本 裕昭
Application Number:
JP1999000181622
Publication Date:
January 18, 2006
Filing Date:
June 28, 1999
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
JFEスチール株式会社
International Classes:
C21D8/02; C22C38/00; C22C38/14; C22C38/16; (IPC1-7): C22C38/00; C21D8/02; C22C38/14; C22C38/16
Domestic Patent References:
JP11241118A
JP7268540A
JP5179344A
Attorney, Agent or Firm:
鈴江 武彦
河野 哲
中村 誠
蔵田 昌俊
峰 隆司
福原 淑弘
白根 俊郎
村松 貞男
橋本 良郎