对API SPEC 5L(45版)中有关拉伸试验伸长率的讨论  

Discussion on Tensile Test Elongation in API SPEC 5L(45th Version)

作　　者：李记科 杨红兵 

机构地区：[1]中国石油集团石油管工程技术研究院,西安710077 [2]北京隆盛泰科石油管工程技术有限公司,北京100101

出　　处：《焊管》2015年第4期67-69,共3页Welded Pipe and Tube

摘　　要：对API SPEC 5L(45版)10.2.4试验方法中有关拉伸试验伸长率的内容进行了讨论,认为其标准要求不合理。建议采用API SPEC 5L(43版)6.2.1拉伸性能条款中的要求:"当需记录或报告伸长率时,如采用板状试样,记录或报告中应注明试样的公称宽度;如采用圆棒试样,应注明直径和标距长度;如采用全断面试样亦应予以注明"。或者修改为:"应报告4倍比例试样(标距长度为4倍直径的棒状试样,L0=4D0,k=L0/S0^(1/2)≈4.5)的断后伸长率。对于采用50 mm(2 in)定标距试样,应按照ISO 2566-1或ASTM A370,将断裂后测得的伸长率转换为4倍比例试样的断后伸长率。"In this article, after discussion on tensile test elongation in API SPEC 5L （45th version） 10.2.4 clause, it considered its standard requirements are unreasonable. It suggests to adopt the requirements in the 6.2.1 clause of API SPEC 5L （43rd version）：when elongation is recorded or reported, the record or report shall show the nominal width of the test specimen when strip specimens are used and the diameter and gauge length when round bar specimens are used, or shall state when full section specimens are used. Or the standard requirements are modified to：The percentage elongation of 4 times proportion test pieces （gauge length is 4 times the diameter of the round test pieces, L0=4D0, k= L0/√S0≈4.5 ） after fracture shall be reported. For test pieces with reference to a gauge length of 50 mm（2 in）, the measured elongation after fracture shall be converted to a percentage elongation of 4 times proportion test pieces in accordance with ISO 2566-1 or ASTM A370.

关 键 词：标准 拉伸试验 伸长率 API SPEC 5L 

分 类 号：TG115.52[金属学及工艺—物理冶金]