Influence of intermittent loading on SCC behavior for an X70 pipeline steel in a near neutral pH solution

2007 ◽  
Vol 58 (8) ◽  
pp. 583-587 ◽  
Author(s):  
Z. Wang ◽  
J. Wang ◽  
E. Han ◽  
W. Ke
Keyword(s):  
Pipeline Steel ◽  
X70 Pipeline Steel ◽  
Neutral Ph ◽  
Intermittent Loading

Anodic Dissolution Behavior of the Crack Tip of X70 Pipeline Steel in Near-Neutral pH Environment

2016 ◽  
Vol 25 (12) ◽  
pp. 5468-5476 ◽  
Author(s):  
Zhongyu Cui ◽  
Liwei Wang ◽  
Zhiyong Liu ◽  
Cuiwei Du ◽  
Xiaogang Li ◽  
...  
Keyword(s):  
Anodic Dissolution ◽  
Pipeline Steel ◽  
Crack Tip ◽  
Dissolution Behavior ◽  
X70 Pipeline Steel ◽  
Neutral Ph

Near-Neutral pH SCC Initiation and Early Propagation of X70 Pipeline Steel

2002 ◽  
Author(s):  
Baotong Lu ◽  
Jingli Luo ◽  
Brian McCrady
Keyword(s):  
Crack Initiation ◽  
Applied Stress ◽  
Stress Level ◽  
Pipeline Steel ◽  
Surface Condition ◽  
Test Duration ◽  
Pipe Surface ◽  
X70 Pipeline Steel ◽  
Neutral Ph ◽  
Dog Bone

The near-neutral pH SCC initiation and propagation behavior of X70 pipeline steel was investigated using dog-bone specimens with two different surface conditions, the original external pipe surface and a ground surface. The tests were conducted in NS4 solution de-aerated with N2/5%CO2, under low frequency cyclic load (v = 0.1Hz, R = σmin/σmax = 0.5). The fractography shows that the transgranular crack morphology of near-neutral pH SCC is reproduced under the current test condition. In line with the crack initiation mechanisms, the cracks observed are divided into two types, pit cracks and non-pit cracks. Non-pit crack initiation is found to be the dominative mechanism for the original external pipe surface but the contribution of pit cracks depends on the test duration. The test results indicate that the crack initiation rate increases and the crack initiation life decreases with increasing applied stress level. The crack propagation rate is essentially independent of the applied stress level. Finally, the effects of surface condition and non-metallic inclusions on the SCC mechanism of pipeline steels are discussed.

Effect of Dissolved Oxygen on Stress Corrosion Cracking of X70 Pipeline Steel in Near-Neutral pH Solution

CORROSION ◽  
2010 ◽  
Vol 66 (1) ◽  
pp. 015006-015006-6 ◽  
Author(s):  
Z. Y. Liu ◽  
X. G. Li ◽  
C. W. Du ◽  
L. X. Wang ◽  
Y. Z. Huang
Keyword(s):  
Dissolved Oxygen ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Pipeline Steel ◽  
Corrosion Cracking ◽  
X70 Pipeline Steel ◽  
Neutral Ph

STRESS CORROSION CRACK INITIATION BEHAVIOR FOR THE X70 PIPELINE STEEL BENEATH A DISBONDED COATING

2012 ◽  
Vol 48 (10) ◽  
pp. 1267 ◽  
Author(s):  
Zhiying WANG ◽  
Jianqiu WANG ◽  
En-hou HAN ◽  
Wei KE ◽  
Maocheng YAN ◽  
...  
Keyword(s):  
Crack Initiation ◽  
Stress Corrosion ◽  
Stress Corrosion Crack ◽  
Pipeline Steel ◽  
X70 Pipeline Steel ◽  
Disbonded Coating
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