S31803
Stainless SteelS31803
Duplex stainless steel, high strength & chloride resistance. (ASTM A479; equiv UNS S31803 / EN 1.4462 / ASTM A182 F51 / GB 022Cr22Ni5Mo3N). Nominal values—confirm mill certificate.
Chemical Composition (%)
| C | 0.03 |
|---|---|
| SI | 1 |
| MN | 2 |
| P | 0.03 |
| S | 0.02 |
| CR | 21 |
| NI | 4.5 |
| MO | 2.5 |
| N | 0.08 |
Mechanical Properties
Tensile:≥655 MPa;Yield:≥450 MPa;Elong:≥25%;Hardness:≤290 HB
Chinese Standard
ASTM A479 S31803
Equivalent Standards
ASTM A182 F51 / GB 022Cr22Ni5Mo3N
Equivalent Grades
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.
Applications
双相不锈钢，高强度耐氯。,"Plate
Available Forms
Bar
Uses
Tube"
Heat Treatment
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.
Precautions
Solution anneal 1020–1100 °C and rapid quench; reheating near 300–400 °C (sigma phase) and 475 °C embrittlement zones must be avoided.
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