工程科学学报，第38卷，第7期：952957,2016年7月 Chinese Journal of Engineering,Vol.38,No.7:952-957,July 2016 DOI:10.13374/j.issn2095-9389.2016.07.009:http://journals.ustb.edu.cn 管线钢在含氢气的煤制天然气中服役安全性评估 赵德辉”，徐庆虎》，崔德春)，李金许)区，褚武扬”，李强》 1)北京科技大学腐蚀与防护中心，北京1000832)中海油研究总院新能源研究中心，北京100028 ☒通信作者，Email:jxli65@usth.cdu.cm 摘要煤制天然气是我国煤炭清洁利用的重要发展方向.现有管道用于输送煤制天然气（最高氢分压为0.72MP)时需要 考虑其中低压氢气的影响，因而需先进行氢致开裂安全性评估.本文利用高压釜环境下恒载荷实验和电化学充氢，模拟研究 X-70管线钢和20钢在不同氢含量下的氢损伤和氢致延迟开裂，并对其在煤制天然气中服役安全性进行评估.在总压12 MPa(10MPaN2+2MPaH,)的高压釜中放置一个月，两种钢的金相试样均不出现氢损伤，U弯试样不开裂，加屈服强度σ，的 恒载荷试样不发生断裂.在含0.72MP的煤制天然气中长期服役时，进入两种钢的氢含量均远低于σ，下发生氢致延迟开裂 的门槛氢含量和出现氢损伤的门槛氢含量，因而X一70钢和20钢在煤制天然气中长期服役均具有高的氢损伤和氢致开裂安 全系数. 关键词煤制天然气：管线钢：氢致延迟开裂：氢含量：安全系数 分类号TG172.8 Safety evaluation of pipeline steels under SNG containing H2 ZHAO De-ui),XU Qing-hu?,CUl De-chun?),LI Jin-u),CHU Wu-yang",LI Qiang? 1)Corrosion and Protection Center,University of Science and Technology Beijing,Beijing 100083,China 2)New Energy Research Center,CNOOC Research Institute,Beijing 100028,China Corresponding author:E-mail:jxli65@ustb.edu.cn ABSTRACT Synthetic natural gas (SNG)is an important developing direction of the clean utilization of coal.The present pipeline steel may cause hydrogen-induced delayed cracking when used to transit SNG due to the hydrogen partial pressure in SNG perhaps up to0.72 MPa.Therefore,the safety assessment of pipeline steel for long-term service is very important and necessary.In this work,hy- drogen damage and hydrogen-induced delayed cracking in X-70 pipeline steel and 20steel at different hydrogen contents were studied by using autoclave constant load test and electrochemical hydrogen charging methods.The service safety of the steels in SNG was eval- uated.There is no hydrogen damage in the two kinds of steel after being placed in the autoclave in which the total pressure 12 MPa (10 MPa N2+2 MPa H2)is kept for one month.Hydrogen-induced delayed cracking does not occur in the U-bending specimen.And the constant load samples do not fail after they are kept at the yield stress for one month.The hydrogen content entering into X-70 and 20* samples is much lower than the threshold hydrogen content for hydrogen-induced delayed cracking and that for hydrogen damage. Therefore,both X-70 steel and 20*steel have high safety factors during the long-term service of transiting SNG. KEY WORDS synthetic natural gas:pipeline steel:hydrogen-induced delayed cracking:hydrogen content:safety factor 利用煤转化生产天然气，是缓解我国天然气供求 展煤制天然气是我国煤炭清洁利用的重要发展方向. 矛盾的有效途径之一.同时，煤制天然气（简称SNG) 除了主要成分甲烷(CH,体积分数通常大于95%) 具有煤炭转化效率高及对环境污染小的优点，因而发 外，SNG具有含量级的H,和惰性气体、微量C0等四， 收稿日期：2015-07-08 基金项目：国家重点基础研究发展计划资助项目(2014CB643301):国家自然科学基金资助项目(51171024)工程科学学报，第 38 卷，第 7 期: 952--957，2016 年 7 月 Chinese Journal of Engineering，Vol． 38，No． 7: 952--957，July 2016 DOI: 10． 13374 /j． issn2095--9389． 2016． 07． 009; http: / /journals． ustb． edu． cn 管线钢在含氢气的煤制天然气中服役安全性评估 赵德辉1) ，徐庆虎2) ，崔德春2) ，李金许1) ，褚武扬1) ，李 强2) 1) 北京科技大学腐蚀与防护中心，北京 100083 2) 中海油研究总院新能源研究中心，北京 100028  通信作者，E-mail: jxli65@ ustb． edu． cn 摘 要 煤制天然气是我国煤炭清洁利用的重要发展方向． 现有管道用于输送煤制天然气( 最高氢分压为 0. 72 MPa) 时需要 考虑其中低压氢气的影响，因而需先进行氢致开裂安全性评估． 本文利用高压釜环境下恒载荷实验和电化学充氢，模拟研究 X--70 管线钢和 20# 钢在不同氢含量下的氢损伤和氢致延迟开裂，并对其在煤制天然气中服役安全性进行评估． 在总压 12 MPa ( 10 MPa N2 + 2 MPa H2 ) 的高压釜中放置一个月，两种钢的金相试样均不出现氢损伤，U 弯试样不开裂，加屈服强度 σs的 恒载荷试样不发生断裂． 在含 0. 72 MPa 的煤制天然气中长期服役时，进入两种钢的氢含量均远低于 σs下发生氢致延迟开裂 的门槛氢含量和出现氢损伤的门槛氢含量，因而 X--70 钢和 20# 钢在煤制天然气中长期服役均具有高的氢损伤和氢致开裂安 全系数． 关键词 煤制天然气; 管线钢; 氢致延迟开裂; 氢含量; 安全系数 分类号 TG172. 8 Safety evaluation of pipeline steels under SNG containing H2 ZHAO De-hui1) ，XU Qing-hu2) ，CUI De-chun2) ，LI Jin-xu1)  ，CHU Wu-yang1) ，LI Qiang2) 1) Corrosion and Protection Center，University of Science and Technology Beijing，Beijing 100083，China 2) New Energy Ｒesearch Center，CNOOC Ｒesearch Institute，Beijing 100028，China  Corresponding author: E-mail: jxli65@ ustb． edu． cn ABSTＲACT Synthetic natural gas ( SNG) is an important developing direction of the clean utilization of coal． The present pipeline steel may cause hydrogen-induced delayed cracking when used to transit SNG due to the hydrogen partial pressure in SNG perhaps up to 0. 72 MPa． Therefore，the safety assessment of pipeline steel for long-term service is very important and necessary． In this work，hy￾drogen damage and hydrogen-induced delayed cracking in X--70 pipeline steel and 20# steel at different hydrogen contents were studied by using autoclave constant load test and electrochemical hydrogen charging methods． The service safety of the steels in SNG was eval￾uated． There is no hydrogen damage in the two kinds of steel after being placed in the autoclave in which the total pressure 12 MPa ( 10 MPa N2 + 2 MPa H2 ) is kept for one month． Hydrogen-induced delayed cracking does not occur in the U-bending specimen． And the constant load samples do not fail after they are kept at the yield stress for one month． The hydrogen content entering into X--70 and 20# samples is much lower than the threshold hydrogen content for hydrogen-induced delayed cracking and that for hydrogen damage． Therefore，both X--70 steel and 20# steel have high safety factors during the long-term service of transiting SNG． KEY WOＲDS synthetic natural gas; pipeline steel; hydrogen-induced delayed cracking; hydrogen content; safety factor 收稿日期: 2015--07--08 基金项目: 国家重点基础研究发展计划资助项目( 2014CB643301) ; 国家自然科学基金资助项目( 51171024) 利用煤转化生产天然气，是缓解我国天然气供求 矛盾的有效途径之一． 同时，煤制天然气( 简称 SNG) 具有煤炭转化效率高及对环境污染小的优点，因而发 展煤制天然气是我国煤炭清洁利用的重要发展方向． 除了主要成分甲烷( CH4，体积分数通常 大 于 95% ) 外，SNG 具有含量级的 H2和惰性气体、微量 CO 等［1］