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通过实验室模拟控制轧制及不同的冷却工艺,成功试制了具有良好综合力学性能的工程机械用低合金高强度钢,并研究了在不同工艺下的组织和性能。结果表明:试验钢采用两阶段控制轧制和直接淬火+低温回火工艺生产的钢板强度最高,其抗拉强度为1838MPa、屈服强度为1531MPa;采用层流冷却+等温碳分配+低温回火冷却工艺生产的钢板韧性最高,室温及-40℃冲击功分别为48、32J。
Through laboratory simulation of controlled rolling and different cooling processes, the low alloyed high strength steel for construction machinery with good mechanical properties was successfully tested and the microstructure and properties under different processes were studied. The results show that the steel produced by two-stage controlled rolling and direct quenching + low-temperature tempering has the highest tensile strength, the tensile strength is 1838MPa and the yield strength is 1531MPa. The laminar flow cooling, isothermal carbon distribution and cryogenic tempering Steel production process of the highest toughness, room temperature and -40 ℃ impact energy were 48,32 J.