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首页> 外文会议>ASME international pipeline conference 2008 >NEAR NEUTRAL pH SCC OF GRADE X80 LINEPIPE STEELS UNDER CYCLIC LOADING
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NEAR NEUTRAL pH SCC OF GRADE X80 LINEPIPE STEELS UNDER CYCLIC LOADING

机译：X80管线钢在循环载荷下的近中性pH SCC

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摘要

Susceptibility to stress corrosion cracking (SCC) of Grade X80 linepipe steels, which were produced by recent TMCP (Thermo-Mechanical Controlled Processing) technique, controlled rolling (CR) followed by accelerated cooling process (ACC), in near neutral pH conditions was investigated, and cracking behavior was compared with conventional Grade X65 linepipe. Longitudinal strip specimens with small surface notches were cyclically loaded in the NS4 solution with cathodic polarization of -l000mV vs. SCE. No significant difference in susceptibility to SCC was found between Grades X80 and X65 linepipes, both produced by TMCP process, even under higher stress condition for X80 linepipe steel. Hydrogen permeation test reviled the strong effect of hydrogen for the cracking under the SCC test condition. Transgranular cracking and quasi-cleavage fracture were observed as an evidence of the effect of both corrosion and hydrogen embrittlement on near neutral pH SCC.
机译：研究了X80级管线钢的应力腐蚀开裂（SCC）的敏感性，这种X80级管线钢是在最近的中性pH条件下通过最新的TMCP（热机械控制加工）技术，控制轧制（CR）和加速冷却工艺（ACC）生产的，并将开裂行为与常规X65级管线管进行了比较。将具有小表面凹口的纵向带状样品循环加载到NS4溶液中，阴极极化率为-1000mV（相对于SCE）。即使是在X80管线钢的较高应力条件下，也都是通过TMCP工艺生产的X80和X65级管线管对SCC的敏感性没有显着差异。氢渗透测试显示出在SCC测试条件下氢对于裂解的强大作用。观察到经晶裂纹和准解理断裂，作为腐蚀和氢脆对近中性pH SCC的影响的证据。

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