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← ScienceWhich risk increases when high-pressure hydrogen gas encounters embrittled steel?
A)Hydrogen-induced cracking✓
B)Increased weld strength
C)Formation of iron oxides
D)Improved impact toughness
💡 Explanation
Hydrogen-induced cracking is accelerated when hydrogen atoms diffuse into the steel lattice, causing dislocations and reduced ductility because of stress intensification at crack tips. Therefore the high-pressure exacerbates this embrittlement, rather than improving strength; other factors drive oxidation.
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