13-8PH
Alloy Steel13-8PH
Chinese GB precipitation-hardening stainless steel.
Chemical Composition (%)
| C | 0.05 |
|---|---|
| SI | 0.1 |
| MN | 0.2 |
| CR | 12.25 |
| NI | 7.5 |
| MO | 2 |
| AL | 0.9 |
| P | 0.01 |
| S | 0.008 |
Applications
High-end / niche grade used in aerospace, defense, tooling, bearing, gear or heavy shaft applications.
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 (≈8%) stabilises the austenite and improves toughness and pitting resistance. Molybdenum (≈2.25%) 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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