Thick steel plate with low cracking sensitivity and low yield ratio and manufacturing method thereof

US10781510B2 · kind B2 · utility

Assignee

• JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO., LTD · CN

Inventors

• Xianjin Sun · Jiangyin, CN
• Zhuzhong Gao · 安丰镇, CN
• Jianguo Hu · 流花街道, CN
• Jingtao Li · 安丰镇, CN
• Pifeng MIAO · 安丰镇, CN
• Xiaolin Wu · 安丰镇, CN
• Ailai Shi · Jiangyin, CN
• Fu Zhao · Lo Wu, CN
• Feng Xu · Beijing, CN
• Shouyu Fang · Jiangyin, CN

Key dates

• Filing date: Oct 19, 2016
• Grant date: Sep 22, 2020
• Expiry date: Jun 22, 2037

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C21D6/02
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

An ultra-heavy steel plate with low cracking sensitivity and low yield ratio, the mass percentages of chemical components of the steel plate are C 0.05-0.09; Si 0.2-0.4; Mn 1.3-1.6; Al 0.02-0.04; Nb 0.03-0.08; V 0.03-0.08; Cr 0.1-0.5; Ni 0.1-0.5; Mo 0.1-0.3; Cu 0.2-0.5; Ti 0.01-0.02; P≤0.015; S≤0.003; N≤0.007, the balance being Fe and inevitable impurities; the carbon equivalent is ≤0.43, the cold cracking sensitivity coefficient Pcm is ≤0.20. A low cracking sensitivity and low yield ratio steel plate with a thickness of 40-70 mm is manufactured by the process steps of KR molten iron pretreatment-converter smelting-LF refining-RH vacuum degassing-continuous casting-lid-covering slow cooling for the continuous casting slabs-casting slabs heating-controlled rolling-controlled cooling-hot straightening-air cooling and so on.