UNS NO8904, ti a mọ ni 904L, jẹ kekere carbon giga alloy austenitic alagbara, irin eyiti o jẹ lilo pupọ ni awọn ohun elo nibiti awọn ohun-ini ipata ti AISI 316L ati AISI 317L ko pe. 904L pese ti o dara kiloraidi aapọn aapọn ipata fifọ, resistance pitting, ati resistance ipata gbogbogbo ti o ga ju 316L ati 317L molybdenum mu awọn irin alagbara irin alagbara.