Abstract
Hydrogen sulfide corrosion test was used to test the hydrogen-induced cracking sensitivity of the normalized BNS pipeline steel. The microstructure and morphology of hydrogen induced crack(HIC) of the normalized BNS pipeline steel after hydrogen sulfide corrosion test were observed with optical microscopy(OM), scanning electron microscopy(SEM). Combined with electron probe microanalyzer(EPMA) and hardness test, the hydrogen-induced cracking behavior of BNS pipeline steel was studied from the aspects of microstructure, crack morphology, center segregation and harness. The results showed that the pearlite band with high hardness caused by center segregation of C and Mn was the main crack initiation and propagation path for the long-size and linear shape hydrogen induced crack at the center of plate thickness, and the type of crack propagation was transgranular. Some tiny hydrogen induced crack nucleated from the small calcium-aluminate inclusion and the tiny hydrogen induced crack would not propagate to form long-size cracks with no suitable propagation path existing around the inclusion.
Highlights
The sustainable economic development has led to an increase in demand for oil and natural gas resources
When pipeline is used to transport the oil and natural gas which are rich in H2S gas, hydrogen induced crack is produced in pipeline which can cause pipeline leakage to reduce pipeline life
The hydrogen inducedcracking behavior of the normalized BNS pipeline steel was studied by the analysis of the microstructure, crack morphology, and the relationship between the microstructure and crack
Summary
The sustainable economic development has led to an increase in demand for oil and natural gas resources. When pipeline is used to transport the oil and natural gas which are rich in H2S gas, hydrogen induced crack is produced in pipeline which can cause pipeline leakage to reduce pipeline life. The pipeline steel used in the manufacture of the pipeline was required to have high strength, excellent toughness and good HIC resistance. Most of the reports mainly focus on hydrogen induced-cracking behavior of rolled pipeline steel produced by Thermo Mechanical Control Process(TMCP). The hydrogen inducedcracking behavior of the normalized BNS pipeline steel was studied by the analysis of the microstructure, crack morphology, and the relationship between the microstructure and crack.
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