屈服强度、抗拉强度、断裂伸长率是钢铁材料质保书中三个非常重要的力学性能参数。薄板产品质保书延伸率常会标注有L2、L3或是50mm、80mm等字样。冷轧薄板产品有美标欧标日标三种拉伸试样，标准拉伸试样标记为原始标距x标距位置宽度。
标距是在材料拉伸试验过程中，用以测量采集数据的两个标记之间的长度。拉伸之前的标距为原始标距，俗称试样标距，一般为50mm或80mm。HRJ Tests；断裂伸长率习惯性称为延伸率、断后伸长率。同一块样板在同样方向拉伸，用欧标L3和日标L2标距测量，所测得的延伸率是不一样的。一般情况下，欧标试样L3的延伸率低于日标试样L2。部分工程师使用“欧标试样延伸率x1.1或1.2≈日标试样延伸率”进行快速换算。
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山东省计量测试学会；力值硬度计量专业委员；济南恒瑞金试验机有限公司
（试验机服务中心）（试验机配件供应中心）（特殊夹具定制中心） |
