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为了研究热处理工艺对低合金高强钢力学性能的影响,在连续退火条件下对HC300LA钢进行了模拟试验和工业试验。采用连续退火模拟试验机模拟连退生产工艺,研究了退火温度对低合金高强钢HC300LA力学性能的影响,获得了不同强度要求的试验钢。在实际生产过程中,分别研究了不同均热时间、快冷冷速条件下低合金高强钢HC300LA的力学性能变化情况。试验结果表明,随着退火温度的提高,低合金高强钢的强度下降,断后伸长率有所提高;随着均热时间的延长,低合金高强钢的强度有缓慢下降的趋势;随着快冷冷速的增加,低合金高强钢的强度增加,断后伸长率逐渐降低。
In order to study the effect of heat treatment on the mechanical properties of low alloy high strength steel, HC300LA steel was simulated and industrialized under continuous annealing conditions. The continuous annealing simulation test machine was used to simulate the production process. The effect of annealing temperature on the mechanical properties of low alloy high strength steel HC300LA was studied, and the test steel with different strength requirements was obtained. In the actual production process, the changes of mechanical properties of low alloy high strength steel HC300LA under different soaking time and fast cooling and cooling rate were studied respectively. The results show that with the increase of annealing temperature, the strength of low-alloy high-strength steel decreases and the elongation at break increases. With the increase of soaking time, the strength of low alloy high-strength steel tends to decrease slowly. The cooling rate increases, the strength of low-alloy high strength steel increases, the elongation after fracture decreases.