Rack steel plate with a thickness up to 177.8 mm by a continuous casting slab and manufacturing method thereof

US11242577B2 · kind B2 · utility

Assignee

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

Inventors

• Pifeng MIAO · 安丰镇, CN
• Gang Qian · McLean, US
• Guanyou Liu · 安丰镇, CN
• Liang Chen · Nanjing, CN
• Xiaolin Wu · 安丰镇, CN
• Jingtao Li · 安丰镇, CN
• Zhuzhong Gao · 安丰镇, CN
• Xiaojiang RUAN · 安丰镇, CN

Key dates

• Filing date: Oct 18, 2016
• Grant date: Feb 8, 2022
• Expiry date: Mar 12, 2037

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C21C7/10
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The present invention relates to a rack steel plate with a thickness up to 177.8 mm by a continuous casting slab, the constituents and mass percentages including C0.11˜0.15%, Si0.15˜0.35%, Mn0.95˜1.25%, P≤0.010%, S≤0.002%, Cr0.45˜0.75%, Mo0.4˜0.6%, Ni1.3˜2.6%, Cu0.2˜0.4%, Al0.06˜0.09%, V0.03˜0.06%, Nb≤0.04%, N≤0.006%, B0.001˜0.002%, the balance is Fe and unavoidable impurity elements. The manufacture method includes, in sequence, KR molten steel pretreatment, converter smelting, LF refining, RH refining, continuous casting through a straight-arc continuous casting machine, shielding the continuous casting slab a cover and slowly cooling, cleaning the continuous casting slab, heating, high-pressure water descaling, control rolling, straightening, slowly cooling, quenching and tempering treatment. The rack steel plate of large thickness in present invention has advantages of high strength, good plasticity and excellent toughness at a low temperature, the process method has advantages of simple process, low cost and efficiently quick etc.