High-strength angle steel for engineering in extremely cold environment and production method of high-strength angle steel

Abstract

The invention discloses high-strength angle steel for extremely cold environment engineering and a production method thereof, and belongs to the technical field of steel and iron material processing. The angle steel comprises the following chemical components in percentage by mass: 0.12 to 0.15 percent of C, 1.20 to 1.35 percent of Mn, 0.28 to 0.33 percent of Si, 0.012 to 0.022 percent of Nb, 0.035 to 0.040 percent of V, 0.015 to 0.020 percent of Ti, 0.020 to 0.030 percent of Als, less than or equal to 0.008 percent of P, less than or equal to 0.008 percent of S and the balance of Fe and inevitable impurities. According to the method, low-temperature rolling, finish rolling water cooling temperature waiting, finish rolling large deformation, air cooling after rolling and heat preservation on a cooling bed are adopted, a cooling path is optimized, comprehensive structure regulation and control are achieved, proeutectoid ferrite and a small amount of acicular ferrite which are optimized in pearlite cluster distribution and uniform in size are obtained, grains are refined into a heterostructure within the average 10 [mu] m, and the yield is high. The strength and the low-temperature impact performance of the angle steel are improved.

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