影响钢管3PE防腐层离线拉伸试验结果的因素分析

Investigation of Factors Influencing Results of Off-line Tensile Test on 3PE Anti-corrosion Layer on Steel Tube

摘要: 根据钢管防腐离线检验中常用的标准GB/T 1040.2—2006和ASTM D638—2014，介绍3PE防腐层试样制备、状态调节等情况，对比3种类型3PE防腐层试样的拉伸强度，分析影响钢管3PE防腐层拉伸试验结果的因素。分析认为：与GB/T 1040.2—2006标准中的IB型、IBA型试样相比，ASTM D638—2014标准中的Ⅳ型试样的标距相对较小，保证了试样防腐层的厚度均匀，同时试样肩部应力集中小，因此推荐采用。

Abstract: According to GB/T 1040.2-2006 and ASTM D638-2013 which are commonly followed in off-line corrosion test for steel tube,the preparation of 3PE anti-corrosion layer samples and the status adjustments are introduced in the paper.Tensile strengths of 3 types of 3PE anti-corrosion layers are compared,and the factors that affect the results of the tensile tests are analyzed.It is concluded that comparing to IB and IBA samples defined in GB/T 1040.2-2006,Ⅳtype sample defined in ASTM D638-2014 has smaller gauge length,which assures the homogeneity of the thickness of an anti-corrosion layer.Ⅳtype sample also has concentrated shouder stress,so it is recommened for the test.