Effect of the microstructure and nonmetallic inclusions on the susceptibility of low-alloy steels to sulfide stress corrosion cracking

1992 ◽  
Vol 27 (6) ◽  
pp. 580-585
Author(s):  
S. V. Artamoshkin ◽  
V. I. Astaf'ev ◽  
T. V. Tetyueva
Keyword(s):  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Nonmetallic Inclusions ◽  
Corrosion Cracking ◽  
Low Alloy Steels ◽  
Sulfide Stress ◽  
Alloy Steels ◽  
Sulfide Stress Corrosion Cracking

Intergranular microchemistry and stress corrosion cracking

1981 ◽  
Vol 377 (1771) ◽  
pp. 477-501 ◽  
Keyword(s):  
Grain Boundary ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Nitrate Solution ◽  
Corrosion Cracking ◽  
Low Alloy Steels ◽  
Intergranular Stress Corrosion ◽  
Oxidation Potentials ◽  
Alloy Steels ◽  
Impurity Elements

An important contributory role of grain boundary segregation of residual impurities in the intergranular stress-corrosion cracking of carbon and low alloy steels is proposed. Experimental results are presented of the stress corrosion susceptibility of mild steel in nitrate solution, and in relation to varying grain boundary composition as monitored by Auger electron spectroscopy. The harmfulness of a particular impurity element depends on three factors: its bulk level; its segregation thermodynamics and kinetics resulting in an equilibrium enrichment at the grain boundaries; and its ability to promote electrochemical dissolution of the grain boundary. A hierarchy of impurity elements that exacerbate stress corrosion cracking is presented and correlated with equilibrium oxidation potentials. The results and simple model allow the prediction of the relative harmfulness of impurity elements with respect to intergranular stress corrosion in commercial carbon and low alloy steels from a knowledge of the bulk concentration only. This enables significant improvements in performance to be designed in the alloy by respecifying lower levels of only the one or two highly detrimental impurities.

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.

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