October 10, 2025

Fracture Resistance of Weld and Heat-Affected Zones in Line Pipe Steels in High Pressure H2 Gas: Microstructure-Property Correlation

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X70 steel pipe HAZ exhibited lower fracture resistance compared to its weld due to a less favorable microstructure.
Fracture toughness samples from weld and HAZ regions of X65 and X70 steels were analyzed, showcasing significant microstructural differences.
Weld conditions from X65 steel pipe varied in fracture resistance, influenced by microstructural characteristics and cooling rates.
Study utilized advanced techniques like SEM, EBSD, and XRD to examine HAZ microstructures and their fracture behavior.

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Analysis shows fracture toughness variations in X65 and X70 steel welds and HAZ, indicating microstructure's role in high-pressure conditions.

Samanta et al. (2025) studied this question.

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Analysis shows fracture toughness variations in X65 and X70 steel welds and HAZ, indicating microstructure's role in high-pressure conditions.