Title:
HIGH TOUGHNESS AND HIGH TENSILE STRENGTH THICK STEEL PLATE WITH EXCELLENT MATERIAL HOMOGENEITY AND PRODUCTION METHOD FOR SAME
Document Type and Number:
WIPO Patent Application WO/2016/079978
Kind Code:
A8
Abstract:
A high tensile strength thick steel plate of excellent strength, elongation and toughness of the mid-thickness part and excellent material homogeneity is provided by: heating a continuously cast slab, the components of which have been adjusted to a prescribed composition, to 1200-1350°C and then hot casting under conditions of temperature: at least 1000°C, strain rate: not more than 3/s, and cumulative rolling reduction: at least 15% using a mold in which the opposing short sides of the mold differ and, when the length of the shorter short side is 1, the length of the longer short side is 1.1-3.0; then allowing the slab to cool to obtain a steel raw material; after heating said steel raw material again to the Ac3 point-1250°C and then performing at least two passes of hot-rolling in which rolling reduction per single pass is at least 4%, allowing the steel to cool to obtain a thick steel plate; and after heating again to the Ac3 point-1050°C and then cooling rapidly to 350°C or less, tempering said thick steel plate at 550-700°C.
Inventors:
KURONUMA YOTA (JP)
OHTSUBO HIROFUMI (JP)
KITSUYA SHIGEKI (JP)
ICHIMIYA KATSUYUKI (JP)
HASE KAZUKUNI (JP)
OHTSUBO HIROFUMI (JP)
KITSUYA SHIGEKI (JP)
ICHIMIYA KATSUYUKI (JP)
HASE KAZUKUNI (JP)
Application Number:
PCT/JP2015/005726
Publication Date:
April 20, 2017
Filing Date:
November 17, 2015
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C22C38/00; B21B1/02; B21B1/38; B21B3/00; B21J1/02; C21D8/02; C22C38/58
Attorney, Agent or Firm:
SUGIMURA, Kenji (JP)
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