轧后控冷对厚壁热轧H型钢力学性能的影响

对比分析了不同轧后控冷工艺对厚壁热轧H型钢产品力学性能的影响。结果表明，对于翼缘厚度为50 mm的热轧H型钢，采用轧后控冷工艺，其屈服强度可达397 MPa，抗拉强度可达543 MPa，断后伸长率为29.5%，0 ℃冲击功均值为132 J；实际生产中，控冷段轧件表面冷速不低于54 ℃/s，出控冷段时轧件表面温度不高于590 ℃，既能获得优良的力学性能，又能满足组产经济性的要求。

Effects of controlled cooling process on mechanical properties of hot rolled H beam with heavy flange thickness

The effects of controlled cooling process on mechanical properties of hot rolled H beam with heavy flange thickness after rolling were analyzed.The results show that the maximum yield strength of H beam could be reached 397 MPa,the maximum tensile strength could be reached 543 MPa,the elongation is 29.5% and the impact energy at 0 ℃ is 132 J by using controlled cooling process.The excellent mechanical properties and great group production efficiency could be obtained when the cooling rate of product surface in controlled cooling process no less than 54 ℃/s and the surface temperature no above than 590 ℃ after controlled cooling in practical production.