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CNG气瓶在不同H2S浓度中的临界裂纹尺寸
引用本文:张亦良,王晶,陕小平,李邦宪.CNG气瓶在不同H2S浓度中的临界裂纹尺寸[J].中国腐蚀与防护学报,2005,25(5):285-290.
作者姓名:张亦良  王晶  陕小平  李邦宪
作者单位:北京工业大学 北京100022 (张亦良,王晶,陕小平),国家质检总局特检中心 北京100013(李邦宪)
摘    要:对3种不同的压缩天然气气瓶用钢4130X、30CrMo材料,在两种H2S环境溶液(高浓度2000×10-6和中等浓度200×10-6)中,采用改进型WOL试样,在测定材料室温K1C的基础上,用螺栓加载法,对22个试样测定了H2S环境下(室温)的临界应力强度因子KISCC.由此确定了不同材料在不同环境溶液中的临界裂纹尺寸,得到了气瓶工作压力及等效应力与临界裂纹尺寸的关系曲线.结果表明:几种材料的K1C值均较高,正常环境中都表现了良好的断裂韧性,但在H2S环境中,KISCC仅为K1C值的20%~40%.对于同样的4130X气瓶用钢,不同的供货来源,其KISCC值相差约30%,临界裂纹尺寸相差约80%.

关 键 词:临界应力强度因子KISCC  临界裂纹尺寸  硫化氢环境  应力腐蚀
文章编号:1005-4537(2005)05-0285-06
收稿时间:2004-01-18
修稿时间:2004-01-18

CRITICAL CRACK SIZES OF CNG CYLINDER STEEL IN H2S ENVIRONMENT
ZHANG Yiliang,WANG Jing,SHAN Xiaoping,LI Bangxian.CRITICAL CRACK SIZES OF CNG CYLINDER STEEL IN H2S ENVIRONMENT[J].Journal of Chinese Society For Corrosion and Protection,2005,25(5):285-290.
Authors:ZHANG Yiliang  WANG Jing  SHAN Xiaoping  LI Bangxian
Affiliation:ZHANG Yiliang~1,WANG Jing~1,SHAN Xiaoping~1,LI Bangxian~2
Abstract:Three groups of specimens of CNG cylinder steels,4130X and 30CrMo,were tested in dense and moderate H_2S solutions.By using modified WOL specimens loaded with bolts,we obtained K_(ISCC) in H_2S environment,as well as K_(1C) in air.The critical crack sizes of different materials in H_2S environment were thus figured out,and the curves with working pressures and equivalent stress to critical crack size were plotted.The results show that K_(1C) of those specimens were all in a high level,thus with good fracture toughness in normal environment.However,K_(ISCC) in H_2S environment ranged from 20% to 40% of K_(1C).For two groups of specimens made of CNG steel 4130X but from different vendors,their K_(ISCC) are 30% difference and their critical crack sizes are 80% difference.
Keywords:stress intensity factor  critical crack size  H2S environment  stress corrosion cracking
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