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Explanation: "Hydrogen Induced Cracking (HIC)
Chemical reactors containing hydrogen may suffer from hydrogen induced cracking (HIC). In contrast with molecular H2 gas, Hydrogen atoms penetrate steel reactor walls. Recombination of atoms forms H2 gas, which piles up in voids in the metal structure. Internal pressure increases until blisters build up and cracking occurs. Propagation of cracks occurs often by transitional cracks between two parallel cracks. This process is known as stepwise cracking"