特殊加载条件下X65管线管焊缝SSCC的试验

 采用4点弯曲试样，对X65钢级UOE焊管焊缝接头进行NACE0177标准规定的SSCC（Sulfur Stress Corrosion Cracking，硫化物应力腐蚀开裂）试验，并采用应变计法完成目标应力加载。结果表明，通过应变计法可以有效地建立FPB（Four Point Bent，4点弯曲）试样加载应变-载荷-应力关系，并根据该关系准确确定目标加载应变量，从而实现目标应力的准确加载。采用该方法完成试验试样90%实际屈服强度的应力加载，并经H2S环境溶液浸泡720h后表面未见裂纹，试验材料表现出优异的抗硫化物应力腐蚀开裂性能。

Research of SSCC Test for Weld Seam of X65 UOE Pipe Under Specified Load

The sulfur stress corrosion crack (SSCC) test of weld seam of X65 UOE pipe were studied by using four point bending (FPB) specimen according to the NACE 0177 standards. The strain gauge was used for identifying target strain and loading target stress. The results show that it is efficient to build the relationship among strain, load and stress for four point bending (FPB) specimen by utilizing the method of strain gauge. The target load strain against target load stress can be obtained by the relationship. The loading of 90% actual yield stress were accomplished for the three test specimens by using the method of strain gauge, no crack was observed on the specimen surface after immersion in H2S saturate solution of 720 hours. The test materials show high resistance to the sulfur stress corrosion crack.