High-strength low-carbon bainitic fire-resistant steel and preparation method thereof

US11761050B2 · kind B2 · utility

Assignee

• CENTRAL IRON AND STEEL RESEARCH INSTITUTE · CN

Inventors

• Zhongmin Yang · Longbeilingcun, CN
• Jingjing Du · Beijing, CN
• Ying Chen · Shanghai, CN
• Huimin Wang · Kunming, CN
• Zhaodong Li · Tuji, CN
• Yanguang Cao · Beijing, CN

Key dates

• Filing date: Jun 7, 2021
• Grant date: Sep 19, 2023
• Expiry date: Jun 30, 2041

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C21D2211/002
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A high-strength low-carbon bainitic fire-resistant steel and a preparation method thereof, belong to the technical field of low-carbon air-cooled bainitic fire-resistant steels. The problems of low yield strength, complicated production process and poor high-temperature mechanical properties of the fire-resistant steel in the prior art are solved herewith. The high-strength low-carbon bainitic fire-resistant steel disclosed herein have chemical components by mass percent of: 0.07%-0.1% of C, 0.7%-0.9% of Si, 1.0%-1.5% of Mn, 0.7%-0.8% of Cr, 1.0%-1.3% of Ni, 0.3%-0.35% of Cu, 0.6%-0.8% of Mo, 0.025%-0.035% of Nb, 0.09%-0.15% of V, 0.01%-0.015% of Ti, <0.2% of Nb+V+Ti, <0.02% of Alt, <0.003% of S, <0.008% of P, and the balance is Fe and inevitable impurities. Improvements are realized in the yield strength and high-temperature mechanical properties of the fire-resistant steel.