API RP 751 (referenced in RP 571) lists materials appropriate for HF acid alkylation service. It specifies:
“Chrome-moly steels such as ASTM A-193 B5 (5% Cr) bolts are preferred for their resistance to HF acid-induced cracking.”
“Standard low alloy steels (e.g., B7) are not considered adequately resistant.”
(Reference: API RP 571 summary & API RP 751, Section 5.6.3 – Bolting Materials)
Therefore, the correct and industry-approved answer is option A.
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