典型无缝钢管钢掺氢天然气环境适应性及氢致损伤机理  

Adaptability of Typical Seamless Tube Steels to Hydrogenblended Natural Gas Environments and Hydrogeninduced Damage Mechanism

作　　者：程凯源 彭杨 黄峰[1] 程向龙 徐云峰 彭志贤 刘静[1] CHENG Kaiyuan;PENG Yang;HUANG Feng;CHENG Xianglong;XU Yunfeng;PENG Zhixian;LIU Jing(Hubei Engineering Technology Research Center of Marine Materials and Service Safety,Wuhan University of Science and Technology,Wuhan 430081,China;Hengsteel Valin Steel pipe Co.,Ltd.,Hengyang 421001,China)

机构地区：[1]武汉科技大学、湖北省海洋工程材料及服役安全工程技术研究中心,武汉430081 [2]衡钢华菱钢管有限公司,衡阳421001

出　　处：《中国腐蚀与防护学报》2025年第2期397-406,共10页Journal of Chinese Society For Corrosion and Protection

基　　金：国家自然科学基金(U21A20113和52231003);2023年湖北省重大攻关项目(2023BAA003)。

摘　　要：针对常用中低强度无缝钢管钢掺氢输送天然气环境适应性问题,本文系统研究了不同掺氢比例体积分数分别为0%、5%、10%、15%、20%和100%对10 MPa天然气环境下钢管钢氢脆(HE)敏感性影响规律及机理。结果表明,低强度L245、X42钢在低掺氢比例环境(≤10%)中能保持良好塑性,高掺氢比例环境中(≥20%),延伸率降低,HE敏感性增加;中强度X52钢的HE敏感性维持在较高水平。断口观察表明,低掺氢比例环境中L245与X42钢断口韧性断裂明显,X52钢则已出现部分脆性特征,HE主要由氢增强局部塑性(HELP)机制驱动,同时伴有氢加速应变诱导空位(HESIV)机制;高掺氢比例中,3种钢都表现为由HELP和氢致解理(HEDE)混合机制驱动的脆性断裂特征。综合考虑认为,低于10%的掺氢比例对于上述3种无缝钢管钢是一个相对安全的服役配比。Herein,the effect of the 10 MPa natural gas blended with 0%,5%,10%,15%,20%and 100%(volume fraction)hydrogen respectively on the hydrogen embrittlement(HE)susceptibility of typical home-made medium-and low-strength seamless tube steels L245、X42 and X52 by means of slow strain rate tensile test(SSRT),aiming in understanding the environmental adaptability of the relevant steel tubes.The results show that low-strength steels L245 and X42 maintain good ductility at low hydrogenblending ratio(≤10%),showing minimal influence of hydrogen.However,at higher hydrogen-blending ratios(≥20%),the elongation at break decreases significantly,and the HE susceptibility rises.The HE susceptibility of medium strength steel X52 is relatively high at 5%hydrogen and increases linearly by higher hydrogen-blending rations.The fracture morphology aligns with SSRT results,where steels L245 and X42 exhibit good plasticity and toughness at lower hydrogen-blending ratio(≤10%),while X52 steel shows partial brittleness.HE is mainly driven by the hydrogen enhanced localized plasticity(HELP)mechanism,accompanied by hydrogen enhanced strain-induced vacancies(HESIV)mechanism.At high hydrogen-blending ratios(≥20%),the three steels all show brittle fracture characteristics,driven by a mechanism of mixed HELP and hydrogen enhanced decohesion(HEDE).Overall,a hydrogen-blending ratio below 10%is considered as a safe operating limit for these seamless steel pipes.

关 键 词：无缝钢管钢 掺氢比例 氢脆敏感性 HEDE HELP 

分 类 号：TG174[金属学及工艺—金属表面处理]