PH13-8Mo Stainless Steel
PH13-8Mo, UNS S13800, is a high strength martensitic precipitation hardening stainless steel produced by VIM+VAR double vacuum melting. It contains 12.25% to 13.25% chromium, 7.5% to 8.5% nickel, 2.0% to 2.5% molybdenum, 0.90% to 1.35% aluminum, and carbon limited to ≤0.05%. Aging precipitates β-NiAl and carbides to balance strength and toughness. The source also describes corrosion resistance, including marine stress corrosion resistance, high temperature stability, and use in aerospace, nuclear, and petrochemical equipment.
Product details
Chemical composition
| PH13-8Mo | C | Si | Mn | P | S | Ni | Cr | Mo | N | Al |
|---|---|---|---|---|---|---|---|---|---|---|
| min | – | – | – | – | – | 7.5 | 12.5 | 2.0 | – | 0.9 |
| max | 0.05 | 0.1 | 0.1 | 0.01 | 0.008 | 8.5 | 13.25 | 2.5 | 0.01 | 1.35 |
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Grade equivalents
| English Item | UNS | W.Nr. | JIS | GB/T | Other Grades |
|---|---|---|---|---|---|
| PH13-8Mo 13-8Mo Alloy 13-8 | S13800 | 1.4534 | – | S51380 0Cr13Ni8Mo2Al | X3CrNiMoAl13-8-3 XM-13 |
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Physical properties
| Density g/cm³ | 7.85 |
|---|---|
| Melting range ℃ | 1405-1440 |
| Thermal conductivity (100℃) λ/(W/m•℃) | 24.3 |
| Specific heat J/kg•℃ | 502 |
| Elastic modulus GPa | 200-210 |
| Electrical resistivity μΩ•m | 0.42 |
| Linear expansion coefficient a/10-6℃-1 | 12.5 |
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Mechanical properties
| Tensile strength Rm N/mm | ≥1515 |
|---|---|
| Yield strength RP0.2 N/mm | ≥1410 |
| Elongation % | ≥6 |
| Hardness HB | ≥429 |
| *After H950 aging heat treatment | |
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Applications
- Aerospace components: aircraft landing gear, structural parts such as corner fittings and brackets, and high-strength engine parts
- Nuclear equipment: reactor pressure vessels, piping, and radiation-resistant components
- Petrochemical equipment: corrosion-resistant valves, pump bodies, and high-pressure piping handling sulfur-bearing or acidic media
- Marine engineering: fasteners and seawater-desalination equipment requiring stress-corrosion resistance
- Medical devices: high-strength surgical instruments such as orthopaedic implants
- High-end fasteners: cold-headed bolts and rivets for high-load corrosive environments
- Special machinery: lightweight racing components and injection moulds requiring resistance to heat and wear
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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