Stress Corrosion Crack Tests of 16MnR Low Alloy Steel in Anhydrous Ammonia Environment

2005 ◽  
pp. 974-979
Author(s):  
Zhiming Lu ◽  
Bing Bing Chen ◽  
Zeng Liang Gao ◽  
De Ming Fang
Keyword(s):  
Stress Corrosion ◽  
Stress Corrosion Crack ◽  
Alloy Steel ◽  
Low Alloy Steel ◽  
Anhydrous Ammonia

Stress Corrosion Crack Tests of 16MnR Low Alloy Steel in Anhydrous Ammonia Environment

2005 ◽  
Vol 297-300 ◽  
pp. 974-979
Author(s):  
Zhiming Lu ◽  
Bing Bing Chen ◽  
Zeng Liang Gao ◽  
De Ming Fang
Keyword(s):  
Stress Intensity ◽  
Stress Corrosion ◽  
Stress Corrosion Crack ◽  
Stress Corrosion Cracking ◽  
Stress Intensity Factors ◽  
Threshold Stress ◽  
Threshold Stress Intensity ◽  
Low Alloy Steel ◽  
Intensity Factors ◽  
Anhydrous Ammonia

Anhydrous ammonia is one of the medium where the steel is easy to suffer stress corrosion cracking. Many stress corrosion crack accidents of ammonia storage tanks have been reported all over the world for recent years. 16MnR low alloy steel with good composite mechanical properties is the most common used pressure vessel steel in China, it has better anticorrosion properties than the low alloy high strength steel, especially in anhydrous ammonia environments. Many stress corrosion crack researches have been done for 16MnR steel in wet hydrogen sulfide service for last decades, but less has been done in anhydrous ammonia environments. Stress corrosion tests with eight constant strain pre-cracked specimen were carried out in this work. The pre-cracked specimen were loaded with loading bolts and put into the special ammonia storage tank for tests, they were taken out from the tank periodically to measure crack length. The stress corrosion crack growth rate and the threshold stress intensity factors KISCC of 16MnR steel in anhydrous ammonia environments were measured. Based on test results, the effects of environmental factors and steel strength on stress corrosion cracking of 16MnR steel in anhydrous ammonia service were analyzed. It could be concluded that specimen cracks of the 16MnR steel in anhydrous ammonia environments almost do not grow, threshold stress intensity factors KISCC are higher than 90MPa m .

The electrode potential within a growing stress corrosion crack

1977 ◽  
Vol 357 (1691) ◽  
pp. 439-452 ◽  
Keyword(s):  
Stress Corrosion ◽  
Sodium Hydroxide ◽  
Stress Corrosion Crack ◽  
Crack Growth ◽  
Alloy Steel ◽  
Electrode Potential ◽  
Potential Distribution ◽  
Sodium Hydroxide Solution ◽  
Low Alloy Steel ◽  
Electrode Reactions

The distribution of electrode reactions occurring in a stress corrosion crack which is growing by enhanced anodic dissolution has been used to analytically establish the electrode potential distribution within the crack. This calculated potential distribution is discussed with reference to existing models for stress corrosion crack growth. The results of the analysis have been applied to the growth of stress corrosion cracks in a low alloy steel in 8 m sodium hydroxide solution at a temperature of 373 K.

Stress Corrosion Cracking of a Low Alloy Steel in Acetate Solutions

CORROSION ◽  
1974 ◽  
Vol 30 (1) ◽  
pp. 18-23 ◽  
Author(s):  
J. G. PARKER ◽  
W. G. PEARCE
Keyword(s):  
Stress Corrosion ◽  
Alloy Steel ◽  
Stress Corrosion Cracking ◽  
Corrosion Cracking ◽  
Low Alloy Steel
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