协议 440
Stainless Steel协议 440
Agreement/custom standard steel 协议 440
Chemical Composition (%)
| C | 0.04 |
|---|---|
| SI | 0.1 |
| MN | 0.3 |
| CR | 0 |
| NI | 0 |
| MO | 0 |
| NB | 0 |
| TI | 0 |
| P | 0.03 |
| S | 0.02 |
Applications
Agreement or custom enterprise standard steel grade.
Available Forms
Bar, plate, sheet, tube, forgings, strip, wire, powder
Uses
Austenitic stainless steel with excellent corrosion resistance, formability and weldability; non-magnetic in annealed condition. High nickel (≈6%) stabilises the austenite and improves toughness and pitting resistance. Molybdenum (≈2%) 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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