AC2205

Stainless Steel

AC2205

Duplex stainless steel. (UNS S31803; equiv 2205 Corrosion Resistant / UNS S31803). Nominal values—confirm mill certificate.

Chemical Composition (%)

C0.03
CR21
NI4.5
MO2.5
N0.08

Mechanical Properties

Tensile:≥620 MPa;Yield:≥450 MPa;Elong:≥25%

Equivalent Standards

2205 Corrosion Resistant

Applications

双相不锈钢，高强度耐氯。,Bar

Available Forms

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.

Uses

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

Heat Treatment

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.

Precautions

UNS S31803 AC2205 / UNS S31803

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