15-5PH Stainless Steel
15-5PH is a martensitic precipitation hardening stainless steel developed from 17-4PH. Its adjusted composition includes 14.0% to 15.5% chromium, 3.5% to 5.5% nickel, and 2.5% to 4.5% copper. The source states that these changes improve transverse toughness and overall properties. Precipitation hardening combines strength, toughness, and corrosion resistance, making the grade a substitute for 17-4PH and conventional alloy steels in precision components exposed to complex stress and corrosive service conditions.
Product details
Chemical composition
| 15-5PH | C | Si | Mn | P | S | Cr | Ni | Cu | Mo | Nb |
|---|---|---|---|---|---|---|---|---|---|---|
| min | – | – | – | – | – | 14 | 3.5 | 2.5 | – | 5*C |
| max | 0.07 | 1 | 1 | 0.03 | 0.015 | 15.5 | 5.5 | 4.5 | 0.5 | 0.45 |
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Grade equivalents
| English Item | UNS | W.Nr. | JIS | GB/T | Other Grades |
|---|---|---|---|---|---|
| 15-5PH XM-12 | S15500 | 1.4545 | – | 0Cr15Ni5Cu4Nb | X5CrNiCuNb15-5 |
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Physical properties
| Density g/cm³ | 7.78 |
|---|---|
| Melting range ℃ | 1397-1453 |
| Thermal conductivity (100℃) λ/(W/m•℃) | 17.9 |
| Specific heat J/kg•℃ | 460 |
| Elastic modulus GPa | 195 |
| Electrical resistivity μΩ•m | 0.98 |
| Linear expansion coefficient a/10-6℃-1 | 10.8 |
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Mechanical properties
| Tensile strength Rm N/mm | ≥1200 |
|---|---|
| Yield strength RP0.2 N/mm | ≥1000 |
| Elongation % | ≥10 |
| Hardness HB | ≥290 |
| *After H900 aging heat treatment | |
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Applications
- Aerospace: aircraft flap tracks, engine pylons, structural parts, and other critical load-bearing components
- Industrial equipment: high-pressure valves, oil and gas components, nuclear-reactor parts, gears, and fasteners
- Special service: chemical-processing equipment and paper machinery requiring both corrosion resistance to nitric acid or salt spray and high strength
Available product forms
- Round Bar
- Wire
- Forgings
- Plate
- Strip
- Seamless Pipe
- Welded Pipe
- Capillary Tube
- Flanges
- Pipe Fittings
- Non-standard Custom Parts
Values follow the Milike materials catalogue and are provided for preliminary review. Confirm the applicable purchase specification, heat treatment condition, and inspection requirements before final material selection.
- Heat and batch traceability
- PMI testing available
- Cut-to-size processing
- Material certificates on request
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