Effect of tempering on mechanical proprieties and corrosion behavior of X70 HSLA steel weldments

Noureddine, Moustafa; Allaoui, Omar

doi:10.1007/s00170-019-04810-y

Cited by 5 publications

(2 citation statements)

References 14 publications

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“…6,7 HSLA X70 steel is particularly of interest for sour gas applications due to its high mechanical resistance (551 MPa), ductility and weldability. 8,9 To approve alloys for sour gas applications, it is important to investigate the properties of proposed steels for oil pipelines. Metallurgical, mechanical and environmental factors can alter their mechanical properties, including resistance, wear and embrittlement resistance.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of corrosion behaviour and susceptibility to hydrogen-induced cracking in high-strength low-alloy X70 steels under sour gas conditions

Quiñones,

Condori,

Apaza-Apaza

et al. 2024

Corrosion Engineering, Science and Technology: The Internationa

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High-strength low-alloy (HSLA) steels find extensive usage in the oil industry for manufacturing pipes due to their requirement for materials with high mechanical and corrosion resistance. Among these steels, the HSLA X70 steels are particularly of great interest to the petroleum industry because of its high mechanical resistance, ductility and weldability. In this study, it was aimed to assess the corrosion behaviour of HSLA API X70 pipelines using electrochemical impedance spectroscopy (EIS) technique and evaluate its resistance to hydrogen-induced cracking (HIC). The analyses were conducted in non-sour and sour media, as per NACE TM0284 standard. Microstructural characterisations of polished and corroded samples were also conducted using scanning electron microscopy (SEM) and optical microscopy (OM). The results indicate that the resistance to HIC in API 5L X70 steel is compromised when exposed to surface corrosion in sour gas media. This susceptibility may be attributed to the presence of microconstituents MnS and M/A along the grain boundaries, which were found in the crack trajectory. The identified microstructural features are deemed to exert a significant influence on the propagation of cracks and the consequent susceptibility to HIC. Moreover, the EIS tests revealed the lowest corrosion resistance when exposed to H2S media, as MnS inclusions accelerate the active regions in the matrix, consequently leading to the formation of a plethora of corrosion products and the dissolution of iron.

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Section: Introductionmentioning

confidence: 99%

Evaluation of corrosion behaviour and susceptibility to hydrogen-induced cracking in high-strength low-alloy X70 steels under sour gas conditions

Quiñones,

Condori,

Apaza-Apaza

et al. 2024

Corrosion Engineering, Science and Technology: The Internationa

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“…The primary is exemplified by a furnacemelted homogeneous sample subjected to heat treatment, having the transient metallurgy during cooling being observed in situ (recording at 15 fps) by a laser scanning confocal microscope, demonstrated by Wan et al [22], or by a ceramic-covered steel substrate dipping technique shown by Loder and Michelic [23]. Tempering post-processing heat treatments have been studied by Noureddine and Allaoui [24], showing improved mechanical properties in X70 HSLA weldaments. A post-welding heat treatment approach was studied with Gleeble systems, which are advanced thermal cycling equipment, utilized by Moeinifar et al [25] to emulate multi-layer depositions thermally.…”

Section: Introductionmentioning

confidence: 99%

Microstructures of high-strength steel welding consumables from directed thermal cycles by shaped laser pulses

Robertson

Frostevarg

Ramasamy³

et al. 2020

Int J Adv Manuf Technol

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Filler wire metallurgy was modified through temporally shaped laser pulses, controlling cooling cycles in a recently developed method. Trends were identified through efficient mapping while maintaining representative thermal cycles of welding processes. A primary pulse melted preplaced filler wires while a secondary, linearly ramped-down pulse elevated the nugget to re-austenization temperatures. Ramped-down pulses resulted in linear cooling rates comparable with and exceeding furnace-based methods, between 50 and 300 • C/s. The linear decay of laser output power guided the temperature through a regime to obtain desired microstructures. For three very high-strength steel filler wire chemistries, quenching resulted in smaller plates with cross-hatched microstructures, accompanied by grain boundary ferrite. Finer bainite microstructures started forming for fast linear temperature decay, about 250 • C/s. Slower decay or a weaker third cycle formed coarser microstructures with coalescent sheaves and less cross-hatching.

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Metallurgical and mechanical attributes of gas metal arc welded high-strength low-alloy steel

Zhao

Bezgans

Vdonin

et al. 2023

Int J Adv Manuf Technol

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Effect of tempering on mechanical proprieties and corrosion behavior of X70 HSLA steel weldments

Cited by 5 publications

References 14 publications

Evaluation of corrosion behaviour and susceptibility to hydrogen-induced cracking in high-strength low-alloy X70 steels under sour gas conditions

Evaluation of corrosion behaviour and susceptibility to hydrogen-induced cracking in high-strength low-alloy X70 steels under sour gas conditions

Microstructures of high-strength steel welding consumables from directed thermal cycles by shaped laser pulses

Metallurgical and mechanical attributes of gas metal arc welded high-strength low-alloy steel

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