17-7PH
Stainless Steel17-7PH
Semi-austenitic precipitation-hardening, spring applications. (UNS S17700; equiv 17-7 PH / UNS S17700 / ASTM 631). Nominal values—confirm mill certificate.
Chemical Composition (%)
| C | 0.09 |
|---|---|
| CR | 16 |
| NI | 6.5 |
| AL | 0.75 |
Mechanical Properties
Tensile (TH1050):≥1310 MPa;Yield:≥1170 MPa
Equivalent Standards
17-7 PH / ASTM 631
Equivalent Grades
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.
Applications
半奥氏体沉淀硬化，弹性件。,"Sheet
Available Forms
Bar
Uses
Strip"
Heat Treatment
Austenitic stainless steel with excellent corrosion resistance, formability and weldability; non-magnetic in annealed condition. High nickel (≈7.125%) stabilises the austenite and improves toughness and pitting resistance. Used in food processing, chemical plant, architecture, heat exchangers, kitchenware and medical devices.
Precautions
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).
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