Effects of cooling processes on microstructure and susceptibility of hydrogen-induced cracking of X80 pipeline steel

2017 ◽  
Vol 69 (5) ◽  
pp. 590-600 ◽  
Author(s):  
Longfei Li ◽  
Bo Song ◽  
Jin Cheng ◽  
Yuhou Yang ◽  
Zhen Liu
Keyword(s):  
Pipeline Steel ◽  
X80 Pipeline Steel ◽  
Hydrogen Induced Cracking

Hydrogen induced cracking of X80 pipeline steel

2010 ◽  
Vol 17 (5) ◽  
pp. 579-586 ◽  
Author(s):  
Chao-fang Dong ◽  
Kui Xiao ◽  
Zhi-yong Liu ◽  
Wen-jing Yang ◽  
Xiao-gang Li
Keyword(s):  
Pipeline Steel ◽  
X80 Pipeline Steel ◽  
Hydrogen Induced Cracking

scholarly journals Effect of Cooling Rate on the Formation of Nonmetallic Inclusions in X80 Pipeline Steel

Metals ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 392 ◽  
Author(s):  
Xianguang Zhang ◽  
Wen Yang ◽  
Haikun Xu ◽  
Lifeng Zhang
Keyword(s):  
Cooling Rate ◽  
Nonmetallic Inclusions ◽  
Pipeline Steel ◽  
Number Density ◽  
X80 Pipeline Steel ◽  
Stress Cracking ◽  
Inverse Results ◽  
Hydrogen Induced Cracking ◽  
Sulfide Stress ◽  
Sulfide Stress Cracking

Nonmetallic inclusions have a strong influence on the hydrogen-induced cracking (HIC) and sulfide stress cracking (SSC) in pipeline steels, which should be well controlled to improve the steel resistance to HIC and SSC. The effects of cooling rate on the formation of nonmetallic inclusions have been studied both experimentally and thermodynamically. It was found that the increasing cooling rate increased the number density and decreased the size of the inclusions, while the inverse results were obtained by decreasing the cooling rate. Furthermore, as the cooling rate decreased from 10 to 0.035 K/s, the inclusions were changed from Al2O3-CaO to Al2O3-CaO-MgO-CaS. At a high cooling rate, the reaction time is short and the inclusions cannot be completely transformed which should be mainly formed at high temperatures. While, at low cooling rate, the inclusions can be gradually transformed and tend to follow the equilibrium compositions.

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