采用均匀设计方法模拟操作工况开停机过程，以加热温度、反复加热冷却次数、冷却方式以及高温停留时间为指标，通过对比钢材的屈服强度、伸长率、抗拉强度、冲击韧性和硬度，分析了不同工艺因素对304H钢力学性能的影响，结果表明：在620~750 ℃范围内，材料晶界上析出大量的相及二次碳化物，冲击韧性及屈服强度分别下降8%和12%，此结果对材料的设计与应用均具有参考意义。
The simulation test of 304H steel is conducted by using uniform design method based on operation condition. Target factors such as final temperature, heatingcooling cycle, means of cooling, high temperature staying time, etc are considered. The measurements of yield strength, tensile strength, elongation rate, impact toughness, hardness are also conducted for 304H steel with different heat treatment history. It is found that due to the precipitation of σ phase and secondary carbides on the grain boundary the impact toughness and yield strength decrease by 8% and 12% respectively. These results are expected to be the reference for practical design and application of this high temperature material.
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