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Experimental studies on micro alloyed steel used in oil and gas industries

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Abstract

This research involved cold cracking in microalloyed steels, scrutinizing its corrosive impact on physical and mechanical attributes. A comprehensive analysis covers the base material, heat-affected zone, and weld material through microstructural examinations, hardness tests, fracture resistance tests, etc. The heat affected zone exhibits finer grain structures, elevating hardness. The weld region’s fracture toughness is compromised by finefeatures, inducing tear ridge, and micro-cracks, collectively diminishing overall toughness. Fractography identifies fracture causes and flaws. Non-destructive dye crack test detects surface very micro crack on the surface, while fracture analysis explores hydrogen’s influence. Findings reveal a substantial reduction in CTOD and J-fracture resistance in the weld zone decrease that is attributed to lower weld zone ductility. Weld regions exhibit 35 % lower ductility than the base material, with fractography revealing reduced energy absorption and diminished fracture toughness. The study guides improvements in oil and gas pipeline for safety and durability measures.

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Abbreviations

J IC :

Internal crack growth resistance

A 0 :

Initial crack length

W :

Specimen width

S :

Span of the sample

δ t :

Defect assessment in welded structure

δ e :

Elastic component of CTOD

δ p :

Plastic component of CTOD

I max :

Maximum stress intensity factor

E :

Young’s modulus

σys :

Yield strength

v :

Poisson’s ratio

P c :

Plastic component of crack mouth opening displacement

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Acknowledgments

This research is made possible through the invaluable support of various laboratory facilities, with special recognition to TML vendors. A heartfelt appreciation goes to Mr. Amitabh Kumar Ankit, Senior Engineer at Atlantic, Gulf & Pacific (AG&P) Oil and Gas Company, for generously sharing his exceptional technical expertise, which greatly enriched this work.

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Authors and Affiliations

  1. Mechanical Engineering Department, National Institute of Technology, Jamshedpur, Jharkhand, 831014, India

    Mukesh Kumar Nag

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  1. Mukesh Kumar Nag
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Correspondence to Mukesh Kumar Nag.

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Mukesh Kumar Nag is a research scholar in Mechanical Engineering at the National Institute of Technology, Jamshedpur, India. Before pursuing his doctoral program, he gained professional experience at TATA Motors Ltd., Jamshedpur, General Electric, and ABB, Hyderabad, India. He holds a diploma from the Indo Danish Tool Room, Jamshedpur, a Bachelor of Engineering from The Institution of Engineers (India), Kolkata, and a Master of Technology from the National Institute of Technology, Jamshedpur. His research focuses on aeroelastic composite structures, optimization of process and product parts costs, and enhancing performance in agri-food storage systems.

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Nag, M.K. Experimental studies on micro alloyed steel used in oil and gas industries. J Mech Sci Technol 38, 2465–2473 (2024). https://doi.org/10.1007/s12206-024-0425-1

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