API RP 571 emphasizes under Hydrogen Stress Cracking – Hydrofluoric Acid (HF):
“Cracking in carbon steel is influenced by high hardness and tensile stress in the presence of wet HF acid.”
“Controlling weld and heat-affected zone hardness to below 200 BHN is a key mitigation measure, as higher hardness significantly increases susceptibility.”
Steel hardness and strength are thus critical for cracking in HF environments, making option C correct.
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