Transactions of Materials and Heat Treatment

Title：Development and property study of low Mo refractory steel for high-rise building

Authors： Geng Cheng1 Mayou Sufu2 Dong Ruihua3

Unit： 1.School of Planning and Design Xinyang Agriculture and Forestry University 2.School of Architecture and Civil Engineering Xi′an University of Science and Technology 3.School of Materials Science and Engineering University of Science and Technology Beijing

KeyWords： low Mo refractory steel alloying element cooling mode microstructure mechanical properties

ClassificationCode：TG142.1

year,vol(issue):pagenumber：2022,47(9):238-244

Abstract：

In order to improve the comprehensive properties of low Mo refractory steel, the effects of alloying element content and cooling method on the microstructure and mechanical properties for low Mo refractory steel were studied. The results show that M2 refractory steel with low Mo, X1-H and X2-H refractory steels with low Mo+low （Nb+V+Ti） have high strength-plasticity, low yield ratio and good refractory properties (the ratio of yield strength at 600 ℃ to yield strength at room temperature is more than 2/3). The microstructure of air-cooled refractory steel is ferrite, pearlite and a small amount of bainite, and the microstructure of water-cooled refractory steel is bainite and ferrite. The volume fractions of bainite in air-cooled M1,M2 and X1 steels are smaller than that in water-cooled X1-H and X2-H steels, while the ferrite grain size of air-cooled refractory steel is significantly higher than that of water-cooled refractory steel. The addition of trace (Nb+V+Ti) can play the roles of the second phase strengthening and the bainite transformation strengthening, which can effectively compensate for the high temperature strengthening effect of Mo on the refractory steel. Finally, it is determined that when the final rolling temperature is 885 ℃ and the cooling mode is water-cooling, the X2-H steel has the best comprehensive performance.

Funds：

国家自然科学基金资助项目（51708448）

耿城（1979-），男，硕士，副教授 E-mail：llrgch929@163.com

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