scholarly journals Causes of Structural Heterogeneity in High-Strength OCTG Tubes and Minimizing Their Impact on Sulfide Stress Corrosion Cracking Resistance

Metals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1843
Author(s):  
Artem Davydov ◽  
Andrey Zhitenev ◽  
Alexey Alhimenko ◽  
Natalya Devyaterikova ◽  
Konstantin Laev
Keyword(s):  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
High Strength ◽  
Structural Heterogeneity ◽  
Corrosion Cracking ◽  
Corrosion Properties ◽  
Sulfide Stress ◽  
Mechanical And Corrosion Properties ◽  
Quenching And Tempering ◽  
Sulfide Stress Corrosion Cracking

High-strength oil country tubular goods (OCTG) like C110, according to standard API 5CT (yield strength at least 758 MPa), are subject to requirements in terms of mechanical and corrosion properties. In this work, we studied the microstructure of seamless casing tubes made of class C110 high-strength steel with a 194.5 mm diameter and 19.7 mm wall thickness, and its influence on sulfide stress corrosion cracking (SSC). Casing tubes were obtained from continuous billets by screw piercing with preliminary quenching and tempering. It was shown that cracking during the tests always begins from the inner surface of the tube. Rough segregation bands were found on the inner tube surface, which occupies about a third of the thickness of the wall. To increase the resistance of 0.3C-Cr-Mn-Mo + 0.15(V + Nb + Ti) steel to SSC, primary recommendations for adjusting the chemical composition, production technology and heat treatment were developed.

scholarly journals Influence of Structural Heterogeneity of High-Strength OCTG Tubes on Sulfide Corrosion Cracking Resistance

2021 ◽  
Vol 3 (1) ◽  
pp. 5
Author(s):  
Artem Davydov ◽  
Andrey Zhitenev ◽  
Natalya Devyaterikova ◽  
Konstantin Laev
Keyword(s):  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
High Strength ◽  
Threshold Value ◽  
Structural Heterogeneity ◽  
Corrosion Cracking ◽  
Corrosion Properties ◽  
Sulfide Corrosion ◽  
Sulfide Stress ◽  
Sulfide Stress Corrosion Cracking

High-strength oil country tubular goods (OCTG) like C110, according to standard API 5CT (yield strength at least 758 MPa), are subject to requirements in terms of mechanical and corrosion properties. In this work, we studied the influence of seamless tubes microstructure with a 177.8 mm diameter and 10.36 mm wall thickness of class С110 high-strength steel to sulfide stress corrosion cracking (SSC) and sulfide stress corrosion cracking with low strain rates (SSRT). Tubes were obtained from continuous billets by screw piercing with preliminary quenching and tempering. It was established that cracking during the tests always begins from the inner surface of the tube. Rough segregation bands were found on the inner tube surface, which occupies about a third of the thickness. It is shown that the SSRT assessment technique allows to estimate the threshold value of the resistance.

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