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Home – Seamless Steel Pipe – Alloy Steel Seamless Pipe (Cr-Mo) – Cr-Mo Grade Selector Cr-Mo Grade Selector Enter your service conditions to get a recommended ASTM A335 chrome moly grade. Always confirm against your design code. Max metal temperature (°C) Service environment Power steam line / boiler Refinery / hydrogen service Crude / sulfidation High-oxidation furnace Recommend a grade Get a spec-matched quote for this grade → Guidance only — final grade, wall and PWHT must be set by a qualified engineer per the governing code.