Title:
HIGH HEAT INPUT WELDING STEEL PLATE AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2023/184957
Kind Code:
A1
Abstract:
The invention provides a high heat input welding steel plate and a manufacturing method therefor. The chemical composition of the high heat input welding steel plate comprises, by mass percentages: C≤0.1%, Si≤0.15%, S≤0.004%, Mn+Cr+Ni+Cu: 1.5-4.5%, Cr/Ni/Cu mass ratio: 1:2:1, Ti+Mg+Zr+Ca: 0.03-0.3%, Ti+Mg: 0.03-0.2%, and the rest being Fe and unavoidable impurities; a carbon equivalent Ceq is 0.36-0.42, and Ceq=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15. In the manufacturing process for the steel plate, zirconium-calcium cored wire is added during RH refining, slabs are continuously cast after RH tapping, and the slabs undergo rolling in a recrystallization zone and rolling in a non-recrystallization zone, which can promote the formation of acicular ferrite and improve the crack arrest performance of the steel plate.
Inventors:
ZHANG YU (CN)
ZHAO FU (CN)
WANG NA (CN)
ZHAO FU (CN)
WANG NA (CN)
Application Number:
PCT/CN2022/127884
Publication Date:
October 05, 2023
Filing Date:
October 27, 2022
Export Citation:
Assignee:
ZHANGJIAGANG RONGSHENG SPECIAL STEEL CO LTD (CN)
INSTITUTE OF RES OF IRON AND STEEL JIANGSU PROVINCE/SHA STEEL CO LTD CN (CN)
JIANGSU SHAGANG GROUP CO LTD (CN)
INSTITUTE OF RES OF IRON AND STEEL JIANGSU PROVINCE/SHA STEEL CO LTD CN (CN)
JIANGSU SHAGANG GROUP CO LTD (CN)
International Classes:
C22C38/58; C21D8/02; C22C38/04
Foreign References:
| CN114703424A | 2022-07-05 | |||
| CN1760398A | 2006-04-19 | |||
| CN101684534A | 2010-03-31 | |||
| CN106574316A | 2017-04-19 | |||
| JP2002053912A | 2002-02-19 |
Attorney, Agent or Firm:
SUZHOU WISPRO INTELLECTUAL PROPERTY AGENCY (CN)
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