3J240
Other3J240 / (3J21)
3J240 grade supplied by Shanxi Youte Steel (jlhsteel.net).
Chemical Composition (%)
| C | 0.07 |
|---|---|
| SI | 0.6 |
| MN | 1.7 |
| P | 0.01 |
| S | 0.01 |
| CR | 19 |
| NI | 14 |
| MO | 6.5 |
Available Forms
Bar, Plate, Tube, Forging
Uses
Austenitic stainless steel with excellent corrosion resistance, formability and weldability; non-magnetic in annealed condition. High nickel (≈15%) stabilises the austenite and improves toughness and pitting resistance. Molybdenum (≈7%) 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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