针对淬火态超高强度EQ70海洋平台用钢进行系列回火试验,研究了回火时间和温度两个参数对其组织和性能的影响。结果表明,马氏体完全分解后继续延长回火时间,试验钢的冲击性能并无明显提高,强度反而下降;提高回火温度可明显缩短马氏体分解时间,提高回火温度以缩短回火时间,可以获得良好的综合力学性能。 A series of tempering tests were carried out on quenched high strength EQ70 marine platform steel. The effects of tempering time and temperature on the microstructure and properties were studied. The results show that after the martensite is completely decomposed, the lengthening of the tempering time is continued, the impact performance of the test steel is not obviously improved and the strength is decreased. Increasing the tempering temperature can shorten the martensite decomposition time and raise the tempering temperature to shorten the tempering Time, you can get a good comprehensive mechanical properties.