Abstract：Taking NSFR490 fire-resistant steel as an example, the changes of its metallographic organization and mechanical properties at different normalizing temperatures were studied. The results show that under the normalizing treatment for 730-820 ℃, the strength decreases with the increase of temperature, but it still meets the engineering application standard. Otherwise, the plasticity is improved (elongation rate increased from 20% to 26%). The tensile test at 600 ℃ satisfy the requirement of high temperature yield strength greater than 2/3 of room temperature yield strength. Further observation of the microstructure of NSFR 490 fire-resistant steel shows that the overall microstructure of the alloy has little change under a high temperature process of 600 ℃, and only the grain size has grown slightly, which is consistent with the mechanical properties of refractory steel at high temperature (yield strength decreased from 315 MPa to 292 MPa). At last, combined with the practical engineering application of the refractory steel, the displacement- temperature curve and failure critical temperature point 600 ℃ of the material are obtained by using ANSYS software.
陈俊, 罗恒勇, 林申正. 热处理工艺对建筑用490 MPa级耐火钢力学性能的影响[J]. 粉末冶金材料科学与工程, 2019, 24(3): 220-225.
CHEN Jun, LUO Hengyong, LIN Shenzheng. Effect of heat treatment technology on the mechanical property of 490 MPa grade fire-resistance steel. Materials Science and Engineering of Powder Metallurgy, 2019, 24(3): 220-225.
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2019, Vol. 24 
