500 MPA yield strength-graded, high-stretchability hot-dip aluminum-zinc and color-coated steel plate and manufacturing method therefore

US10982296B2 · kind B2 · utility

Assignee

• BAOSHAN IRON & STEEL CO., LTD. · CN

Inventors

• Jun Li · Miaocheng, CN
• Dechao Xu · Shanghai, CN
• Xin Liu · Lo Wu, CN
• Zhilong DING · Shanghai, CN
• Yuling REN · Shanghai, CN
• Xuewei Ye · Shanghai, CN
• Hengfa Hu · Shanghai, CN
• Hongming Chen

Key dates

• Filing date: Jul 25, 2016
• Grant date: Apr 20, 2021
• Expiry date: Mar 15, 2037

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/26
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

An aluminium-zinc-hot-dipped and colour-coated steel plate having yield strength of ≥500 MPa and a high elongation and a manufacturing method thereof, with the chemical components in mass percentage of a substrate of the steel plate being: 0.07-0.15% of C, 0.02-0.5% of Si, 1.3-1.8% of Mn, N≤0.004%, S≤0.01%, Ti≤0.15%, Nb≤0.050%, and the balance being Fe and other inevitable impurities, and meanwhile satisfying the conditions of: (C+Mn/6)≥0.3%; Mn/S≥150; Nb satisfying 0.01%≤(Nb-0.22C-1.1N)≤0.05% where no Ti is contained; Ti satisfying 0.5≤Ti/C≤1.5 where no Nb is contained; and 0.04%≤(Ti+Nb)≤0.2% where Ti and Nb are added in combination. The steel plate has a tensile strength of ≥550 MPa, an elongation after fracture of ≥15%, a good strength and toughness and an excellent corrosion resistance.