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1. (WO2018030186) THICK HIGH-STRENGTH STEEL PLATE AND PRODUCTION PROCESS THEREFOR

Pub. No.:    WO/2018/030186    International Application No.:    PCT/JP2017/027513
Publication Date: Fri Feb 16 00:59:59 CET 2018 International Filing Date: Sat Jul 29 01:59:59 CEST 2017
IPC: C22C 38/00
C21D 8/02
C22C 38/14
C22C 38/58
Applicants: JFE STEEL CORPORATION
JFEスチール株式会社
Inventors: TAKEUCHI Yoshiko
竹内 佳子
TOJI Yuki
田路 勇樹
ARAO Ryo
荒尾 亮
ICHIMIYA Katsuyuki
一宮 克行
HASE Kazukuni
長谷 和邦
Title: THICK HIGH-STRENGTH STEEL PLATE AND PRODUCTION PROCESS THEREFOR
Abstract:
Provided is a thick high-strength steel plate which, even when having a thickness exceeding 50 mm, is excellent in terms of brittle crack propagation arrestability and which can be industrially produced by an extremely simple process. The thick high-strength steel plate has a composition which contains, in terms of mass%, 0.03-0.20% C, 0.03-0.5% Si, 0.5-2.2% Mn, up to 0.02% P, up to 0.01% S, 0.005-0.03% Ti, 0.005-0.080% Al, and up to 0.0050% N, with the remainder comprising Fe and unavoidable impurities, and in which the Ceq defined by expression (1) satisfies expression (2). The thick high-strength steel plate has a texture in which the intensity for the {113}<110> orientation at a position corresponding to one-half the plate thickness is 4.0 or higher and the intensity for the {113}<110> orientation on the steel plate surface is 1.7 or higher. Ceq=[C]+[Mn]/6+[Cu]/15+[Ni]/15+[Cr]/5+[Mo]/5+[V]/5 (1) Ceq≥0.40 (2)