不同含氢环境下X80管线钢的慢应变速率拉伸性能  

Slow Strain Rate Tensile Properties of X80 Pipeline Steel in Different Hydrogen-Containing Environments

作　　者：牛化昶 李毅[2] 宋卫臣[2] 吕加华 NIU Huachang;LI Yi;SONG Weichen;LYU Jiahua(Shandong Natural Gas Pipeline Co.,Ltd.,Jinan 250101,China;SINOPEC Petroleum Engineering Corporation,Dongying 257026,China)

机构地区：[1]山东省天然气管道有限责任公司,济南250101 [2]中石化石油工程设计有限公司,东营257026

出　　处：《机械工程材料》2025年第3期100-104,共5页Materials For Mechanical Engineering

摘　　要：在气体组成(体积分数)为2%H_(2)+2%CO_(2)+N_(2)(2%氢环境)、5%H_(2)+2%CO_(2)+N_(2)(5%氢环境)以及100%N_(2)(无氢环境)的12 MPa高压环境中,对X80管线钢母材轴向、周向试样以及焊缝试样开展慢应变速率拉伸试验,研究了不同环境下试样的拉伸性能,基于断面收缩率评价了母材和焊缝的氢脆敏感性。结果表明:与无氢环境相比,2%氢环境、5%氢环境下母材轴向试样的断后伸长率分别降低约1%和5%,母材周向试样分别降低约7%和11%,焊缝分别降低约7%和12%,焊缝的塑性劣化程度大于母材,且在5%氢环境中的劣化程度更大;在2%和5%氢环境中母材和焊缝的抗拉强度基本相似;在相同含氢环境中母材周向试样的抗拉强度高于轴向试样,焊缝的抗拉强度最低,母材轴向试样的塑性优于周向试样,焊缝的塑性最差。2%氢环境下母材以及焊缝的氢脆敏感性小于5%氢环境下,在相同含氢环境下焊缝的氢脆敏感性最大,母材周向试样次之,母材轴向试样最小。Slow strain rate tensile tests were carried out on base metal axial and circumferential specimens and weld specimens of X80 pipeline steel in 12 MPa high pressure environment with gas composition(volume fraction)of 2%H_(2)+2%CO_(2)+N_(2)(2%hydrogen environment),5%H_(2)+2%CO_(2)+N_(2)(5%hydrogen environment)and 100%N_(2)(hydrogen-free environment).The tensile properties of specimens in different environments were studied,and the hydrogen embrittlement sensitivity of base metal and weld was evaluated based on the percentage reduction of area.The results show that compared with those in the hydrogen-fee environment,the percentage elongation after fracture of the base metal axial specimen in 2%hydrogen environment and 5%hydrogen environment decreased by about 1%and 5%,of the base metal circumferential specimen decreased by about 7%and 11%,and of the weld decreased by about 7%and 12%,respectively.The plasticity deterioration degree of the weld was greater than that of the base metal,with a greater degradation in the 5%hydrogen environment.The tensile strengths of base metal and weld in 2%and 5%hydrogen environments were basically similar.In the same hydrogen-containing environment,the tensile strength of the base metal circumferential specimen was higher than that of the axial specimen,and the tensile strength of the weld was the lowest;the plasticity of the base metal axial specimen was better than that of the radial specimen,and the plasticity of the weld was the worst.The hydrogen embrittlement sensitivities of base metal and weld in 2%hydrogen environment were lower than that in 5%hydrogen environment.The hydrogen embrittlement sensitivity of weld was the largest,followed by base metal circumferential specimen and axial specimen in the same hydrogen-containing environment.

关 键 词：X80管线钢 含氢环境 慢应变速率拉伸 断后伸长率 氢脆敏感性 

分 类 号：TE832[石油与天然气工程—油气储运工程]