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为改进调质态超高强海洋工程用钢的力学性能,研究了2炉不同硼含量的钢。经控制轧制后,在实验室条件下采用不同回火温度处理以确定最佳热处理温度,并对实验钢板进行金相组织观察,利用扫描电镜和透射电镜讨论分析了硼及回火温度对组织、性能的影响。实验结果表明,硼有利于提高钢板的淬透性,含硼钢600℃回火可以满足E690的性能要求;随回火温度的提高,含硼钢和无硼钢的强度降低,伸长率升高,含硼钢的变化幅度比无硼钢大;含硼钢在630~660℃存在明显的回火脆性区,而无硼钢具有较好的回火稳定性;无硼钢在650℃回火可以满足E550的性能要求。
In order to improve the mechanical properties of quenched and tempered ultrahigh strength offshore engineering steels, two different steels with different boron contents were studied. After controlled rolling, different tempering temperatures were used to determine the optimal heat treatment temperature under laboratory conditions. The microstructure of the steel was observed by scanning electron microscopy and transmission electron microscopy. The effects of boron and tempering temperature on microstructure , The impact of performance. The experimental results show that boron can improve the hardenability of steel. The tempering of boron-containing steel at 600 ℃ can meet the performance requirements of E690. With the increase of tempering temperature, the strength of boron-containing steel and boron-free steel decreases and the elongation increases High and boron-containing steel is larger than boron-free steel; boron-containing steel has obvious temper brittleness zone at 630-660 ℃, while boron-free steel has good tempering stability; boron- Fire can meet the performance requirements of the E550.