求助（Z质量）？ the plates should have a guaranteed through thickness ductility. this guarantee is given by the “z” parameter value which is defined by the minimum average reduction of area on 3 specimen taken in the “z” direction. tests specimen, subjected to anticipated heat treatment cycle, are taken through the thickness and the said reduction shall not be less than 35% of the initial cross section : this corresponds to “z35” quality. test could be carried out following astm a770. 钢板应拥有一个厚度方向（z向）的保证韧性。保证值由“z”参数值来定义，其为在“z”向取3个试样所得的最低平均断面收缩率。 这些测试试样应经预期的热处理循环之后并沿厚度方向取样，而所述的最低平均收缩面积必须不低于初始断面积的35%：这就对应着了“z35”级钢板的质量要求。试验应按astm a770标准来进行。 注： “through thickness”指的是钢板厚度方向，这也就是所谓的z向。钢板轧制的另外一个方向是轧制方向。钢板z向的性能和轧制方向的性能是不同的。钢结构厚板的z向性能要低于沿钢板轧制方向的性能，包括屈服强度、抗拉强度、延性指标、冲击韧性和断裂韧性。所以这句话说明钢板的质量试样要从z向取样，以z向最低的韧性为准，要达到z35级质量标准。查看更多
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