控轧控冷工艺对低合金高强钢Q460力学性能的影响

Influences of Controlled Cooling on Mechanical Property of Low Alloy High Strength Steel Q460

通过改变终轧温度及轧后冷却速度,研究了终轧温度及轧后冷却速度对力学性能的影响。研究结果表明:采用轧后加速冷却的方法,可以显著细化Q460的铁素体晶粒,从而提高其强韧性能。当冷速从2℃/s提高到3.86℃/s时,铁素体晶粒直径从11.5μm细化到8.33μm。当冷速达到2.96℃/s以上时,Rel≥475MPa,Rm≥600MPa,屈强比为70%-80%。

The influences of finishing temperature and delivery cooling rate on mechanical properties of low alloy high strength steel Q460 were discussed by changing finishing temperature and delivery cooling rate. During the experiments, Steel Q460 ferrite grain can been refined significantly by accelerated cooling after rolling, and then its mechanical properties was increased. When cooling rate increased from 2 ℃/s to 3.86 ℃/s, ferrite grain diameter refine from 11.5 μm to 8.33 μm. While cooling rate greater than 2.96 ℃/s, Rel≥475 MPa, Rm≥600 MPa, and Rel/Rm was 70%-80%.