35CrMo和00Cr13Ni5Mo硫化氢环境应力腐蚀开裂

摘要/Abstract

摘要：

用慢应变速率拉伸实验和U形试样浸泡实验、电化学极化技术并结合微观分析手段，在湿硫化氢介质中研究了35CrMo和00Cr13Ni5Mo两种钢的应力腐蚀开裂行为规律。结果表明，35CrMo和00Cr13Ni5Mo钢在实验条件下均具有一定应力腐蚀开裂（SCC）敏感性，其敏感性随着溶液pH的降低和H₂ S浓度的增大而增大;00Cr13Ni5Mo 在实验条件下抗SCC的能力均高于同条件下的35CrMo，在pH3.0的溶液中，二者性能比较接近，在pH4.5的溶液中，00Cr13Ni5Mo 耐H₂S环境SCC的性能明显提高，高于35CrMo，这主要是因为00Cr13Ni5Mo中的耐蚀合金元素增强了其钝化膜的稳定性、降低了氢脆作用所致。

关键词:

35CrMo, 00Cr13Ni5Mo, 硫化氢, 应力腐蚀开裂

Abstract:

Stress corrosion cracking (SCC) behavior of 35CrMo low alloy steel and 00Cr13Ni5Mo stainless steel in hydrogen sulfide environment was investigated by using slowstrainrate test (SSRT), U-bent-specimen immersion test and electrochemincal polarization techniqueBoth 35CrMo steel and 00Cr13Ni5Mo steel were susceptible to SCC in various H₂s solutions, and their SCC susceptibilities reduced with the increase of pH value within 3.0 and 4.5 or the decrease of H₂ s concentration from saturation to 1000 μg·g^-100Cr13Ni5Mo steel was less susceptible to SCC than 35CrMo steel in each tested H₂S condition, but its SCC susceptibility was affected more evidently by the change of pH value than that of 35CrMo steelThe SCC susceptibility factor of 00Cr13Ni5Mo steel was close to that of 35CrMo steel in solutions with lower pH values, while in solution with a pH value of 4.5, the resistance of 00Cr13Ni5Mo stainless steel to hydrogen sulfide stress corrosion cracking was much higher than that of 35CrMoIt was due to the higher concentration of some anticorrosive elements, such as Cr, in 00Cr13Ni5Mo, that promoted the formation of a more stable passive film, leading to a higher hydrogen induced cracking (HIC) resistance of 00Cr13Ni5Mo than 35CrMo in higherpH conditions.

Key words:

35CrMo, 00Cr13Ni5Mo, 硫化氢, 应力腐蚀开裂

刘智勇, 董超芳, 李晓刚, 王立贤, 梁平. 35CrMo和00Cr13Ni5Mo硫化氢环境应力腐蚀开裂 [J]. 化工学报, 2008, 59(10): 2561-2567.

LIU Zhiyong, DONG Chaofang, LI Xiaogang, WANG Lixian, LIANG Ping. Stress corrosion cracking behavior of 35CrMo and 00Cr13Ni5Mo steels in hydrogen sulfide solutions[J]. CIESC Journal, 2008, 59(10): 2561-2567.

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35CrMo和00Cr13Ni5Mo硫化氢环境应力腐蚀开裂

Stress corrosion cracking behavior of 35CrMo and 00Cr13Ni5Mo steels in hydrogen sulfide solutions

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