Effect of tempering temperature at high temperature zone on sulfide stress cracking behavior for casing steel

Liu, M.; Wang, Xintian; Li, Moucheng; Li, X.; Ren, Zhongming; Cao, Guanghui; Zhang, Z.H.

doi:10.1016/j.engfailanal.2019.06.095

Cited by 18 publications

(4 citation statements)

References 41 publications

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“…For example, Wang et al [4] studied the effects of Cr and W contents on SSC resistance and Luo et. al [5] discussed the tempering process on the strength and SSC resistance of Cr-Mo steel; however, few researchers have studied the influence of the metallurgical process on the SSC resistance of OCTG steel since Al deoxidation technology is now the most widely used in conventional smelting, which is the core content of the existing deoxidation technology [6]. As a stronger deoxidizer, Al is added into the furnace in the first step of the deoxidation process, reducing the oxygen content to a very low level; however, the Al deoxidation process will inevitably bring deoxidation products of Al 2 O 3 [7], which become a kind of non-metallic inclusion in steel [6,7].…”

Section: Introductionmentioning

confidence: 99%

Effect of Oxide Metallurgy on Inclusions in 125 ksi Grade OCTG Steel with Sulfide Stress Corrosion Resistance

Zhang

Wang

et al. 2022

Materials

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The effects of Al deoxidation and Zr deoxidation on the microstructure and properties of sulfide stress corrosion resistant high-strength steel have been investigated. The feasibility of the Zr deoxidation instead of Al deoxidation was confirmed by the thermodynamic analysis of the deoxidation of various elements. The experimental results indicate that the average diameters of the inclusions in Al-Steel and Zr-Steel were 2.45 μm and 1.65 μm, respectively. The Al-Steel and Zr-Steel contained 22.38% and 68.77% inclusions per unit area, respectively, and the fraction of inclusions in the Al-Steel and Zr-Steel with diameters less than 2 μm was about 73.46% and 89.63%, respectively, indicating that the Zr deoxidation process could effectively refine inclusions and promote dispersion. The average diameters of austenite grain for the Al-Steel and Zr-Steel were about 9.1 μm and 8 μm, respectively. The fine particles in Zr-Steel could pin the austenite grain boundaries and clearly refine the grains. The average grain size of tempered martensite was 8.2 μm and 3.8 μm, respectively. The yield strength of the Al-Steel and Zr-Steel was 922 MPa and 939 MPa, respectively; the impact energy was 60 ± 6 J and 132 ± 6 J, respectively. Moreover, the fracture time of the NACE-A was from 28 h (Al-Steel) to 720 h (Zr-Steel) without fracture. The experimental steel deoxidized by Zr achieved a simultaneous improvement in strength, toughness and sulfide stress corrosion resistance, and the effect of inclusions on the fracture of the sulfide stress corrosion resistant high-strength steel can be explained by the Griffith theory.

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Section: Introductionmentioning

confidence: 99%

Effect of Oxide Metallurgy on Inclusions in 125 ksi Grade OCTG Steel with Sulfide Stress Corrosion Resistance

Zhang

Wang

et al. 2022

Materials

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“…Oil casing pipe is used to support the wall of oil well, which plays an important role in oil exploration and development. With the increase of oil consumption and advanced technology of oil exploitation, the environment for oil extraction has become progressively harsher, so the requirements for corrosion resistance and mechanical properties of oil pipe are getting higher [1][2][3][4]. If the oil pipe breaks, it will cause oil leakage, which will not only cause great economic losses, but also have a bad impact on the ecological environment [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Study on the effect of mould alternate stirring on the internal quality of the round billet

Zhang

Bao

et al. 2022

Ironmaking & Steelmaking

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In this paper, the effects of mold alternate stirring and single-direction continuous stirring on the internal quality of the billet were compared. When the mold alternate electromagnetic stirring was adopted, with the increase of stirring current form 260A to 350A, the central shrinkage cavity of the billet was disappeared, and the proportion of central equiaxed crystal zone increased gradually from 18.67% to 25.00%. The number of spot segregation larger than 1.0 mm2 in the billet was reduced from 18 to 10, and the maximum positive segregation of carbon and manganese decreased from 1.059 and 1.020 to 1.029 and 1.012, and the maximum negative segregation increased from 0.959 and 0.989 to 0.972 and 0.991, which improved the uniformity of elements distribution of the round billet. Through the above analysis, it can be seen that the mold alternate stirring mode with suitable parameters can improve the internal quality of the billet.

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“…The load caused by gravity is far less than that of steel, which gives titanium alloy pipe strings a wide application prospect in the field of petroleum engineering. For the material selection of titanium alloy oil pipes, high-strength titanium alloy materials with a yield strength greater than 700 MPa are usually used, especially for oil wells with a depth of more than 3000 m. Moreover, the formation temperature of deep wells is also significantly higher than that of ordinary oil wells-that is, more than 150 • C-and its high-temperature strength is key to its performance of service safety [4,5].…”

Section: Introductionmentioning

confidence: 99%

β-Phase-Induced Quasi-Cleavage Fracture Mechanism by Dual-Phase High-Strength Titanium Alloy at Elevated Temperature

Wei

Cheng

et al. 2022

Crystals

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Dual-phase high-strength titanium alloy has the properties of high specific strength and good toughness, which have resulted in its gradual use in the fields of oil and gas well engineering. The elevated-temperature service environment of deep strata is its key research direction. In this paper, the strength and fracture mechanism of a new type of α + β-phase titanium alloy tubing material in its service-temperature range are studied. Its fracture mechanism changed at 130 °C to 150 °C, from normal-stress ductile fracture to quasi-cleavage fracture formed by β-phase voids, which induced microshear, which significantly reduced the elongation of the material and accelerated the rate of yield strength decline with temperature. This mechanism provides a new guiding idea for the design of the microstructure and element content of dual-phase high-strength titanium alloy. For titanium alloy materials in service within the temperature range of the fracture mechanism transition, which is between 130 °C and 150 °C, reducing the void-inducing factors in the β-phase or reducing the content of the β-phase to avoid microshear failure should be considered.

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Effect of tempering temperature at high temperature zone on sulfide stress cracking behavior for casing steel

Cited by 18 publications

References 41 publications

Effect of Oxide Metallurgy on Inclusions in 125 ksi Grade OCTG Steel with Sulfide Stress Corrosion Resistance

Effect of Oxide Metallurgy on Inclusions in 125 ksi Grade OCTG Steel with Sulfide Stress Corrosion Resistance

Study on the effect of mould alternate stirring on the internal quality of the round billet

β-Phase-Induced Quasi-Cleavage Fracture Mechanism by Dual-Phase High-Strength Titanium Alloy at Elevated Temperature

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