022Cr25Ni7Mo4N
Stainless Steel022Cr25Ni7Mo4N
Super-duplex, exceptional pitting resistance. (GB/T 20878; equiv UNS S32750 / EN 1.4410 / ASTM A182 F53 / GB 022Cr25Ni7Mo4N). Nominal values—confirm mill certificate.
Chemical Composition (%)
| C | 0.03 |
|---|---|
| CR | 24 |
| NI | 6 |
| MO | 3 |
| N | 0.24 |
Mechanical Properties
Tensile:≥800 MPa;Yield:≥550 MPa;Elong:≥15%
Chinese Standard
T 20878 022Cr25Ni7Mo4N
Equivalent Standards
ASTM A182 F53 / GB 022Cr25Ni7Mo4N
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
超级双相，极强耐点蚀。,"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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