Title:
溶接熱影響部ＣＴＯＤ特性に優れた厚肉高張力鋼およびその製造方法
Document Type and Number:
Japanese Patent JP5846311
Kind Code:
B2
Abstract:
Provided are a heavy wall thickness high-strength steel plate with excellent low-temperature toughness (Charpy impact and CTOD properties of a weld bond) in a multilayer weld zone and a method for manufacturing the steel plate. The high-strength steel plate has a chemical composition containing, by mass%, a certain amount of C, Si, Mn, P, S, Al, Cu, Ni, Nb, Ti, N, O, and the like, and the balance being Fe and inevitable impurities, in which Ceq which is defined by relational expression (1) is 0.520% or less, in which Ti/N is 1.50 or more and 4.00 or less, in which a parameter relational expression regarding specified chemical elements for controlling the shape of sulfides in steel and the degree of center segregation is satisfied, and in which the hardness of a center segregation part of the steel plate is specified: Ceq = [C] + [Mn]/6 + ([Cu]+[Ni])/15 + ([Cr] + [Mo] + [V])/5 ... (1).
Inventors:
Katsuyuki Ichinomiya
Masao Yuzu
Kenji Hayashi
Masao Yuzu
Kenji Hayashi
Application Number:
JP2014534198A
Publication Date:
January 20, 2016
Filing Date:
September 04, 2013
Export Citation:
Assignee:
jfe Steel Corporation
International Classes:
C22C38/00; C21D8/02; C22C38/58
Domestic Patent References:
| JP2009263777A | 2009-11-12 | |||
| JPH08311549A | 1996-11-26 | |||
| JPH08311550A | 1996-11-26 | |||
| JPH08144008A | 1996-06-04 | |||
| JPH11229077A | 1999-08-24 | |||
| JPH06220577A | 1994-08-09 | |||
| JP2010100903A | 2010-05-06 |
Attorney, Agent or Firm:
Shigeru Inoue
Kazuhiro Mori
Kazuhiro Mori