典型无缝钢管钢掺氢天然气环境适应性及氢致损伤机理
2. 衡钢华菱钢管有限公司
Environmental adaptability and hydrogen damage mechanism of typical seamless steel tube mixed with hydrogen and natural gas引用本文:
程凯源 彭杨 黄峰 程向龙 徐云峰 彭志贤 刘静. 典型无缝钢管钢掺氢天然气环境适应性及氢致损伤机理[J]. 中国腐蚀与防护学报, 10.11902/1005.4537.2024.219.
摘要 相关文章 Metrics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，系统研究了不同掺氢比例（0、5、10、15、20和100 vol%）对10Mpa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，氢脆敏感性增加；中强度X52钢的氢脆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主要以HELP机理为主；高掺氢比例中，三种钢都表现为以HEDE机理为主的脆性断裂特征。综合考虑认为，低于10%的掺氢比例对于上述三种无缝钢管是一个相对安全的服役配比。Abstract：Aiming at the environmental adaptability of typical medium and low strength seamless steel tubes doped with hydrogen for natural gas transportation, this paper systematically studied the rule and mechanism of the influence of different hydrogen mixing ratios (0, 5, 10, 15, 20 and 100 vol%) on the hydrogen embrittlement (HE) susceptibility of steel tubes under 10Mpa natural gas environment. The results show that the material ductility of low-strength L245 and X42 steels is good in the environment of low hydrogen content ratio (≤10%), and the influence of hydrogen content ratio is not obvious. In the environment of high hydrogen content ratio (≥20%), the sample elongation decreases significantly, and the hydrogen embrittlement susceptibility increases. The HE susceptibility of medium strength X52 steel is relatively high even if the proportion of hydrogen is 5%, and the susceptibility increases linearly with the increase of the proportion of hydrogen. The observed fracture morphology is consistent with that of SSRT. L245 and X42 steel still maintain good plasticity and toughness in low hydrogen content ratio (≤10%), while X52 steel shows partial brittleness. HE is mainly based on HELP mechanism, accompanied by HESIV mechanism. At high hydrogen content (≥20%), the three kinds of steel showed obvious brittle fracture characteristics. Hydrogen embrittlement is mainly based on the mixed mechanism of HELP and HEDE. Overall consideration, it can be considered that the hydrogen mixing ratio of less than 10% is a relatively safe service ratio for the above three seamless steel pipes.Key words：Seamless tubular steel, Hydrogen mixing ratio, Hydrogen embrittlement sensitivity, HEDE, HELP收稿日期: 2024-07-24 ViewedFull textAbstract
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