SUH660
Alloy SteelSUH660
(JIS G4901). Nominal values—confirm mill certificate.
Chemical Composition (%)
| NI | 24 |
|---|---|
| CR | 13.5 |
| TI | 1.9 |
| MO | 1 |
| V | 0.1 |
| AL | 0.35 |
| B | 0.001 |
| C | 0.08 |
| SI | 1 |
| MN | 2 |
| P | 0.04 |
| S | 0.03 |
Mechanical Properties
Tensile:≥900 MPa;Yield:≥600 MPa;Elong:≥15%
Chinese Standard
JIS G4901 SUH660
Available Forms
Bar,Plate
Uses
Austenitic stainless steel with excellent corrosion resistance, formability and weldability; non-magnetic in annealed condition. High nickel (≈25.5%) stabilises the austenite and improves toughness and pitting resistance. Molybdenum (≈1.25%) enhances resistance to chloride pitting and crevice corrosion — suited to marine and chemical service. Used in food processing, chemical plant, architecture, heat exchangers, kitchenware and medical devices.
Heat Treatment
Solution anneal 1010–1150 °C followed by rapid water quench to retain austenite; not hardenable by heat treatment. Sensitization avoided by low carbon or stabilizers (Ti/Nb).
Precautions
Weld with low-carbon or stabilized filler (e.g., 316L, 347) to avoid sensitization; passivate after fabrication. Not hardenable, but work-hardens rapidly — use sharp tools and rigid setups. Avoid chloride contact for 304 in warm service; specify 316/317 for marine or aggressive media.
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