【摘要】 针对新型钢包包壳材料SM490B钢,进行了室温断裂韧度、疲劳裂纹扩展速率及350℃(工作状态下,钢包包壳表面的最高温度)下的低周疲劳试验研究。结果表明,SM490B钢的强度和断裂韧度明显高于包壳曾用材料SM41A(Q235)、20g。在试验所取的应力强度因子幅值范围内,与Q235A钢和20g钢相比,SM490B钢的疲劳裂纹扩展速率较快。350℃下的低周疲劳寿命高于压力容器常用钢材16MnR钢300℃下的疲劳寿命。新型钢包包壳材料采用SM490B钢,可大大减少包壳开裂的可能性,提高钢包的承载能力和使用安全性,延长钢包的使用寿命。更多还原

【Abstract】 Tests on fracture toughness and fatigue crack growth rate at room temperature and low-cycle fatigue at 350 ℃(maximum service temperature of ladle shell) were carried out for new-type ladle shell material SM490B.The results show that the strength and fracture toughness of SM490B steel are much higher than that of SM41A and 20g steel used before.Compared with above-mentioned two materials,fatigue crack growth rate of SM490B steel is relatively higher at the stress intensity factor range in the test.The low cycle fatigue life of SM490B steel at 350 ℃ is longer than that of 16MnR steel at 300 ℃.Using SM490B steel as ladle material will reduce the possibility of cracking of ladle shell,prolong lifetime and enhance application safety of new-type ladle.更多还原