ASME规范和ISO标准关于金属材料高温强度计算方法的对比

Calculating Method Comparison of Elevated Temperature Tensile Strength for Metallic Material Acceptance between ASME and ISO

通过对ASME规范关于高温拉伸强度性能背景技术资料的分析,对比了ASME规范第Ⅱ卷D篇表U与表Y-1中的抗拉强度、屈服强度的数据来源及计算方法与ISO标准的差异。结果表明,ASME规范与ISO标准对于高温强度规定有所不同。ASME规范第Ⅱ卷D篇表Y-1中的屈服强度数据趋向于保证值,在材料验收中不考核高温屈服强度,但可以通过考核室温屈服强度间接保证; ISO标准材料力学性能最低值的确定是基于屈服-温度的标准化数据导出的,拟合曲线代表屈服强度比随温度变化的平均值曲线,在材料验收时考核高温度。ASME规范第Ⅱ卷D篇表U中数据适用于设计计算,在高于室温时,表中抗拉强度值是通过将Smith比例和温度关系的拟合曲线提高10%的室温保证值得到的。

Based on the analysis of background technical data series of ASTM code on elevated temperature strength property,this paper compared the data sources and the calculation methods of the tensile strength and yield strength in Table U and Table Y-1 of ASME Section Ⅱ Part D with those in ISO.The results show that elevated strength requirements of ASME code were different from those of ISO.The tabulated values of yield strength in Table Y-1 in ASME Section Ⅱ Division D at temperatures above room temperature tend toward an minimum yield strength value,which was not required and can be indirectly guaranteed by minimum specified room temperature tensile strength based on the Smith method,while the elevated temperature yield strength in ISO was required and obtained by factoring the average ratio against the specified minimum yield stress at room temperature based on the average ratio vs temperature trend curve.The tabulated values of tensile strength in Table U of ASME Section Ⅱ Part D at temperatures above room temperature tend toward an average value,which was as much as 10% above the minimum specified room temperature tensile strength based on the Smith method.