15CrMo round steel (GB/T 3077) is a chromium-molybdenum alloy tailored for high-temperature service, with a precise chemical makeup: 0.12–0.18% carbon (C), 0.40–0.70% silicon (Si), 0.40–0.70% manganese (Mn), 0.80-1.10% CHROMIUM (CR), 0.40-0.55% MOLYBDENUM (MO), mwens pase oswa egal a 0.035% fosfò (P), ak mwens pase oswa egal a 0.035% souf (yo).
CHROMIUM fòme yon kouch oksid pwoteksyon pou reziste segondè - oksidasyon tanperati, pandan y ap molibdèn amelyore rezistans ranpe (ralanti deformation anba chalè soutni ak presyon) - kritik pou tuyaux pote vapè oswa lwil cho nan 400-550 degre. Pwopriyete mekanik li yo gen ladan 440-640 MPa fòs rupture, pi gran pase oswa egal a 295 MPa sede fòs, ak 19% elongasyon minimòm, asire entegrite estriktirèl anba monte bisiklèt tèmik. Entènasyonal ekivalan gen ladan ASTM A335 P11 (USA) ak DIN 1.7335 (Almay) . 15 CRMO se lajman ki itilize nan Power Power Pipelines ak raffineries petrochimik, ak Made - nan - Tuyaux. "