Tackling the toughness of steel pipes produced by high frequency induction welding and heat-treatment

Yan, Peng; Güngör, Özlem E.; Thibaux, Philippe; Liebeherr, Martin; Bhadeshia, H. K. D. H.

doi:10.1016/j.msea.2011.07.034

Cited by 55 publications

(24 citation statements)

References 16 publications

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“…Due to austenite pancaking there is clear continuous textural banding visible in the rolling direction, as opposed to random distribution found in Ref. [31], which highlights the importance of the reduction of {100} fraction to promote crack arrests at the strongest links prevent the crack propagation. The Fig.…”

Section: Toughness and Strengthmentioning

confidence: 67%

“…Depending on the process parameters and the hardenability of the material, the latter two or even all three of these toughening methods are usually used in conjunction with each other. Recent studies have highlighted the importance of texture on the bendability of direct-quenched ultra-high-strength steels (UHSS) [29,30] and on the impact toughness of a ferritic steel [31].…”

Section: Introductionmentioning

confidence: 99%

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Effect of microstructure on the impact toughness transition temperature of direct-quenched steels

Pallaspuro

Kaijalainen

Mehtonen

et al. 2018

Materials Science and Engineering: A

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A sufficient level of toughness at low temperatures is paramount for the use of structural steels intended for arctic applications. Therefore, it is important for the steel industry to identify the factors that control brittle fracture toughness. In this study, the quantitative effect of microstructure on the impact toughness transition temperature has been investigated with 18 different thermomechanically rolled and direct-quenched low-carbon ultra-high-strength steels with varying martensite and bainite contents. The steels were produced by altering their chemical composition, the finish rolling temperature and the total reduction of the prior austenite grains in the non-recrystallisation temperature regime, i.e. austenite pancaking, and characterised in terms of microstructural constituents, grain size distributions and texture as well as by using Charpy-V impact and tensile testing. It is shown for the first time that the impact toughness transition temperatures T 28J and T 50 closely follow a dynamic reference toughness, defined by yield strength and the size of the coarsest grains in the effective grain size distribution at 80th percentile. Decreasing the area fraction of {100} cleavage planes oriented within 15°of the macroscopic fracture plane by increasing austenite pancaking is also shown to improve T 28J. The best toughness is achieved with the lowest finish rolling temperatures that are nevertheless high enough to avoid the subsequent formation of granular bainite, which weakens both the toughness and strength. The results show that it is perfectly possible to produce untempered ultra-high-strength martensitic and martensitic-bainitic structural steels with adequate low-temperature toughness when the grain size is properly controlled.

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Section: Toughness and Strengthmentioning

confidence: 67%

Section: Introductionmentioning

confidence: 99%

Effect of microstructure on the impact toughness transition temperature of direct-quenched steels

Pallaspuro

Kaijalainen

Mehtonen

et al. 2018

Materials Science and Engineering: A

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“…Therefore, to ensure structural integrity and mitigate the effects of fatigue damage, the manufacturing process of the steel pipes, as well their handling and transportation conditions, should be extremely well controlled. The HFIW (High Frequency Induction Welding) process are widely used by the industry in the manufacturing of welded steel pipes [6,7] due advantages like: high productivity, adaptability and no needing of welding consumables [7]. When the HFIW process is followed by austenitization, quenching and temper of the steel tube (like the one studied in this paper), the finished product will usually presents both good mechanical and microstructural homogeneity.…”

Section: Introductionmentioning

confidence: 99%

Influence of the HFIW welded joint in the fatigue resistance of an API 5CT N80 type Q steel tube used in offshore oil and gas exploration

Sorrija

Nascimento

2017

Engineering Failure Analysis

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Steel pipes used in the oil and gas industry are often subjected to dynamic loading. Therefore, to mitigate fatigue cracks nucleation and growth, these steel pipes should be as flawless as possible. HFIW (High Frequency Induction Welding) process is widely used by industry in the manufacturing of steel tubes. These tubes (like the one used in this research), after being welded, are often subject to heat treatments (to improve their mechanical properties and homogenize their microstructure) and to some grinding to remove excess material from the welded joint. However, even after these processes, a discontinuity will still be present. The aim of this paper is investigate how this weld line may assume the role of a notch (stress riser) reducing the fatigue resistance of casing and tubing quenched/tempered steel pipes. The study of the fatigue resistance has been done through the analysis of results obtained from "S a x N" curves, linear regressions and estimation of a fatigue stress concentrator K f'-notch . This K f'-notch differs from the commonly used K f, and is presented in the form of an equation K f'-notch = η.S a γ . In the fatigue tests, non-standardized specimens, taken directly from an API 5CT N80 type Q steel tube, have been used, part of them aligned with the longitudinal weld line and the others aligned with a position situated 90° from it. To complement the fatigue results, tensile tests have been carried on, as well metallographic analysis and a qualitative analysis of the welded joint geometry. The results obtained indicate that while the tube exhibit good mechanical and metallurgical homogeneity it exhibits lack of circularity (or roundness) in the adjacencies of the welded joint. In addition, from the fatigue results obtained, it is clear that the welded joint act as a stress riser, reducing the fatigue resistance of the steel pipe, with values of K f'-notch that can be higher than 2.0.

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“…In local heating, temperature shall be tightly controlled; too low temperature would fail to achieve the desired heat treatment effect, while too high temperature would make the grains grow larger again, hampering the effect of local heat treatment. Therefore, to improve weld quality of a steel pipe, it is imperative to control heating temperature tightly [14]. To acquire more accurate induction heating temperature distribution has always been one of the objectives pursued by related scholars [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional analysis of medium-frequency induction heating of steel pipes subject to motion factor

Han

Zhao

2016

International Journal of Heat and Mass Transfer

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Tackling the toughness of steel pipes produced by high frequency induction welding and heat-treatment

Cited by 55 publications

References 16 publications

Effect of microstructure on the impact toughness transition temperature of direct-quenched steels

Effect of microstructure on the impact toughness transition temperature of direct-quenched steels

Influence of the HFIW welded joint in the fatigue resistance of an API 5CT N80 type Q steel tube used in offshore oil and gas exploration

Three-dimensional analysis of medium-frequency induction heating of steel pipes subject to motion factor

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