CNG气瓶在不同H2S浓度中的临界裂纹尺寸

中国腐蚀与防护学报

2005, Vol. 25

Issue (5): 285-290

研究报告

本期目录 | 过刊浏览

CNG气瓶在不同H2S浓度中的临界裂纹尺寸

张亦良;王晶;陕小平;李邦宪

北京工业大学机电学院

Critical Crack Sizes of CNG Cylinder Steel in H2S Environment

;;Xiaoping Shan;Bangxian Li

北京工业大学机电学院

全文: PDF(164 KB)

摘要: 对3种不同的压缩天然气气瓶用钢4130X、30CrMo材料，在两种H2S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K1SCC, 临界裂纹尺寸, 硫化

Abstract：Three groups of specimens of CNG cylinder steels,4130X and 30CrMo,were tested in dense and moderate H2S solutions.By using modified WOL specimens loaded with bolts,we obtained KISCC in H2S environment,as well as K1C in air.The critical crack sizes of different materials in H2S environment were thus figured out,and the curves with working pressures and equivalent stress to critical crack size were plotted.The results show thatK1C of those specimens were all in a high level,thus with good fracture toughness in normal nvironment.However,KISCC in H2S environment ranged from 20% to 40% of K1C.For two groups of specimens made of CNG steel 4130X but from different vendors,their KISCC are 30% difference and their critical crack sizes are 80% difference.

Key words： stress intensity factor critical crack size H2S environment stress corrosion cracking

收稿日期: 2004-05-08

ZTFLH:

TB37

通讯作者: 张亦良 E-mail: zhangyil@bjut.edu.cn

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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 .
Xiaoping Shan, Bangxian Li. Critical Crack Sizes of CNG Cylinder Steel in H2S Environment. J Chin Soc Corr Pro, 2005, 25(5): 285-290 .

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https://www.jcscp.org/CN/ 或 https://www.jcscp.org/CN/Y2005/V25/I5/285

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