Ferralium255

Stainless Steel

Ferralium255

Duplex stainless steel. (UNS S32550; equiv Ferralium 255 / UNS S32550). Nominal values—confirm mill certificate.

Chemical Composition (%)

C0.04
CR24
NI4.5
MO2.9
N0.1

Mechanical Properties

Tensile:≥760 MPa;Yield:≥550 MPa

Equivalent Grades

UNS S32550 Ferralium255 / Ferralium 255 / UNS S32550

Applications

高强度双相不锈钢。,"Plate

Available Forms

Bar"

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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