Central Iron and Steel Research Institute

Yanguang Cao

Ying Li

Zhongmin Yang

Jingjing Du

Zhaodong Li

Huimin Wang

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, &#x3c;0.2% of Nb+V+Ti, &#x3c;0.02% of Alt, &#x3c;0.003% of S, &#x3c;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.

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Yanguang Cao