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中文摘要：
本研究提出选用MHZ常数关联耐热钢持久性能数据,以HP40和Super304钢为例比较了基于MHZ常数和标准推荐L-M常数的持久性能曲线与实验数据之间的相关性;并对工业中常用的十七种耐热钢实验数据进行分析,对比了MHZ常数和L-M常数在持久性能预测精度上的差异。结果表明不同的L-M常数对数据拟合结果有较大影响,工程应用中为保证较高预测精度需选用优化的L-M常数,否则会导致构件应用时偏危险;对所分析的大部分钢新选用的MHZ常数不仅具有更高预测精度和更优拟合效果,而且能更直观比较不同耐热钢之间的持久性能,故可以作为耐热钢的TTP参数。
英文摘要：
Manson-Haferd constants（Ta=450,lgta=15）,which is named as MHZ constant,was proposed to correlate the creep rupture data.HP40 and Super304 heat resistant steels were taken as examples to describe the distinction of correlation between the creep rupture property curves based MHZ constant and L-M constant with experimental data.In order to analyze the applicability of MHZ constant to heat resistant steel,MHZ constant was applied to correlate the creep rupture data for seventeen steels widely used in industry,the corresponding prediction accuracy was compared with that based on recommended L-M constant.The result showed that the stress-rupture curves with different L-M constants steel are obviously different,which means that the L-M constant should be optimized to guarantee enough life prediction accuracy in the engineering components.However,a good agreement with the experimental data and high prediction accuracy has been achieved in the case of MHZ constant.Moreover,MHZ constant displays a relatively high resolution for creep rupture differences between various steels.It suggests that MHZ constant can be used as temperature-time-parameter（TTP） for heat resistant steel.
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