Title:
METHOD FOR PRODUCING STEEL MATERIAL FOR STRUCTURE EXCELLENT IN TOUGHNESS AT HEAT AFFECTED PART OF WELDING
Document Type and Number:
Japanese Patent JP3525905
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To produce a steel material having good toughness at a good yield even in a large input welded heat affected part.
SOLUTION: When a cast slab having the composition by mass% of 0.01-0.18% C, 0.02-0.60% Si, 0.60-2.00% Mn, ≤0.030% P, ≤0.015% S, 0.005-0.100% Al, 0.007-0.030% Ti, 0.0040-0.0100% N and the balance Fe with inevitable impurities, is cooled, regarding a cooling time t15/11 (second) from 1500°C to 1100°C averaged over the whole thickness of the cast slab and a Ti/N ratio, the relations in the following formula (1) is satisfied. 22600/(t15/11)1.25≤Ti/ N≤1818000/(t15/11)1.7...(1).
Inventors:
Ishikawa, Shin
Kenji OI.
Hoshino, Toshiyuki
Kenji OI.
Hoshino, Toshiyuki
Application Number:
JP2001094945A
Publication Date:
May 10, 2004
Filing Date:
March 29, 2001
Export Citation:
Assignee:
KAWASAKI STEEL CORP
International Classes:
B22D11/22; B22D11/00; B22D30/00; C22C38/00; C22C38/14; C22C38/58; (IPC1-7): B22D11/22; B22D11/00; C22C38/00; C22C38/14; C22C38/58
Attorney, Agent or Firm:
杉村 興作