Microstructure evolution of medium carbon steel during manufacture process for non-quenched and tempered oil well tubes

Liu, S.X.; Chen, Y.; Liu, G.Q.; Liu, X.F.; Zhang, Y.G.; Huang, Jian

doi:10.1016/j.msea.2007.11.146

Cited by 9 publications

(2 citation statements)

References 11 publications

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“…1 With the increasing corrosion substance in oil and gas from the ultra-deep oil well, improved corrosion resistance of X80 pipeline steel is required to ensure service security and duration. 2 Since ceramics have been proved to possess the excellent chemical stability in different environments, 3–5 ceramics coating is considered as a novel choice to improve the corrosion resistance of X80 pipeline steel.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical behaviour of X80 pipeline steel with alumina coating

Huang

Zhang

Wang

et al. 2015

Surface Engineering

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X80 pipeline steel was firstly aluminised at a relative low temperature then treated by a microarc oxidation process. Electrochemical behaviour of X80 pipeline steel before and after the combined treatment was evaluated by electrochemical tests in different solution. Results show that ceramics coating composed of a-Al 2 O 3 and c-Al 2 O 3 can be obtained on the surface of X80 pipeline steel by the combined treatment. In neutral 3?5% NaCl solution and alkaline solution (pH59), X80 pipeline steel with ceramics coating shows a higher corrosion potential and a lower corrosion current density than pure steel and the X80 pipeline steel treated by one-step aluminising. However, aluminising coating presents a better corrosion protection for X80 pipeline steel than that of ceramic coating in acidic solution with pH55. c-Al 2 O 3 is considered as the main reason for the corrosion resistance degradation of ceramic coating in acidic solution.

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Section: Introductionmentioning

confidence: 99%

Electrochemical behaviour of X80 pipeline steel with alumina coating

Huang

Zhang

Wang

et al. 2015

Surface Engineering

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“…Oil casing steel N80 has been widely used as the main material for the dual line construction of gas transporting project from west to east in China due to its high mechanical property and excellent corrosion resistance [1][2][3]. Since oil casing steel often should endure a dynamic loads or impact with the fluctuation of oil and gas, fracture [4] and corrosion [5] fatigue of steel are unavoidable failures during its in-serving life.…”

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confidence: 99%

Effect of Intercritical Quenching on Microstructure and Mechanical Properties of Oil Casing Steel N80

Huang

Wang

Zhang

et al. 2013

AMM

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In order to improve the toughness of oil casing steel N80 without the sacrifice of its original high strength, an intercritical quenching treatment was conducted under the temperature determined by a differential scanning calorimetry (DSC) analysis. Effects of intercritical quenching on the microstructure of oil casing steel N80 were characterized by means of optical microscope (OM) and scanning electron microscope (SEM). Tensile strength, reduction of cross-sectional area and microhardness were measured to evaluate the mechanical property of oil casing steel N80 after intercritical quenching treatment. The study results show that the tensile strength and microhardness of intercritical quenched oil casing steel N80 consisting of ferrite (F) and martensite (M) is slightly lower than that of tempered oil casing steel N80 composing of sorbite (S), yet which is still higher than that of full annealled oil casing steel N80 composing of pearlite (P) and a little amount of ferrite (F). In particular, the reduction of cross-sectional area of oil casing steel N80 intercritical quenched at 740°C is higher than those of tempered and full annealled. Additionally, both dimple and cleavage can be found on the impact fracture surface of N80 steel after intercritical quenching at 740°C. The toughness of oil casing steel N80 can be obviously improved by the intercritical quenching treatment at 740°C due to the formation of ferrite (F).

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