Outokumpu 254 SMO

Stainless Steel

Outokumpu 254 SMO

Proprietary/trade-name steel grade Outokumpu 254 SMO

Chemical Composition (%)

C0.08
CR19
NI24
MO0
CU0
P0.035
S0.035

Applications

Manufacturer proprietary steel grade (trade name) per maker specification.

Available Forms

Bar, plate, sheet, tube, forgings, strip, wire, powder

Uses

Duplex stainless steel with a mixed austenite/ferrite structure giving roughly twice the yield strength of austenitic grades plus excellent chloride resistance. Used in desalination, offshore, pulp & paper, heat exchangers and chemical tankage.

Heat Treatment

Solution anneal 1020–1100 °C and rapid quench; reheating near 300–400 °C (sigma phase) and 475 °C embrittlement zones must be avoided.

Precautions

Heat input and interpass must be controlled to keep the ferrite/austenite balance; avoid exposure 300–400 °C (sigma) and use low carbon. Sensitive to chloride SCC above ≈60 °C.

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