PH13-8Mo Stainless Steel Bar
Premium precipitation-hardening stainless steel for aerospace and high-performance applications
PH13-8Mo stainless steel bar offers exceptional strength-to-weight ratio and corrosion resistance, ideal for demanding aerospace, defense, and precision engineering applications. Heat-treatable to yield strengths exceeding 1,450 MPa while maintaining excellent ductility and toughness.
Quick Specifications
- UNS Designation
- S13800
- Werkstoff Number
- 1.4534
- Yield Strength (H1025)
- 1,450 MPa (210 ksi) minimum
- Tensile Strength (H1025)
- 1,550 MPa (225 ksi) minimum
- Elongation (H1025)
- 8% minimum
- Density
- 7.75 g/cm³
Standards & Certifications
Product Description
PH13-8Mo is a precipitation-hardening martensitic stainless steel specifically developed for applications requiring superior mechanical properties combined with excellent corrosion resistance. This grade achieves high strength through precise heat treatment, making it the material of choice for critical aerospace components, landing gear, fasteners, and pressure housings. The 13% chromium content provides base corrosion resistance, while molybdenum addition enhances pitting resistance in chloride environments.
The unique metallurgical composition allows for solution treatment at moderate temperatures, reducing distortion in precision components compared to conventional high-strength stainless steels. After solution treatment and precipitation hardening at 480°C, the material develops a fine, uniform microstructure of austenite and precipitated intermetallic phases. This controlled microstructure ensures consistent mechanical properties, excellent fatigue resistance, and superior fracture toughness even in thick sections.
PH13-8Mo demonstrates outstanding performance in aerospace environments, including exposure to jet fuel, hydraulic fluids, and seawater. The material is immune to stress corrosion cracking in most practical applications and exhibits excellent corrosion fatigue resistance. Its low thermal expansion coefficient and excellent dimensional stability during heat treatment make it particularly valuable for precision-engineered components requiring tight tolerances.
Advanced vacuum induction melting and vacuum arc remelting processes ensure ultra-low levels of segregation and contamination, critical for high-reliability aerospace applications. The material is readily machinable in the annealed condition and can be precisely heat-treated to achieve specific strength requirements without sacrificing toughness or corrosion resistance.
Specifications
| UNS Designation | S13800 |
| Werkstoff Number | 1.4534 |
| Yield Strength (H1025) | 1,450 MPa (210 ksi) minimum |
| Tensile Strength (H1025) | 1,550 MPa (225 ksi) minimum |
| Elongation (H1025) | 8% minimum |
| Density | 7.75 g/cm³ |
| Melting Point | 1,425°C (2,597°F) |
| Thermal Conductivity | 9.4 W/m·K at 20°C |
| Coefficient of Linear Expansion | 10.8 × 10⁻⁶ /°C (0-100°C) |
| Modulus of Elasticity | 200 GPa |
| Fatigue Strength | 550 MPa at 10⁷ cycles |
| Hardness Range (H1025) | 42-48 HRC |
Chemical Composition
| Element | Content (%) |
|---|---|
| Chromium (Cr) | 12.5-13.5 |
| Molybdenum (Mo) | 7.5-8.5 |
| Nickel (Ni) | 7.5-8.5 |
| Aluminum (Al) | 0.9-1.35 |
| Carbon (C) | 0.025 max |
| Manganese (Mn) | 0.10 max |
| Silicon (Si) | 0.10 max |
| Phosphorus (P) | 0.010 max |
| Sulfur (S) | 0.008 max |
| Iron (Fe) | Balance |
Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength (Annealed) | 860 MPa |
| Yield Strength (Annealed) | 520 MPa |
| Elongation (Annealed) | 20% minimum |
| Reduction of Area | 45% minimum |
| Impact Strength (Charpy V-notch, H1025) | 45-60 J at room temperature |
| Fracture Toughness (K₁c) | 65-75 MPa√m |
Key Features & Advantages
Applications
Aircraft Components
Critical landing gear components, fasteners, actuators, and structural elements in commercial and military aircraft requiring high strength with excellent corrosion resistance and fatigue performance.
Aerospace Engines
Compressor housings, impellers, and casings in jet engines where high temperature corrosion resistance and mechanical properties are essential for extended service life.
Defense Applications
Missile components, ordnance devices, tank armor inserts, and naval systems requiring superior strength, toughness, and resistance to corrosive marine environments.
Precision Instrumentation
Valve bodies, pressure housings, actuator components, and precision-machined parts requiring tight dimensional control and excellent surface finish without distortion.
Oil and Gas
High-pressure valve stems, fasteners, tubing components, and downhole equipment exposed to corrosive subsurface fluids and demanding mechanical loads.
Medical Devices
High-strength implants, surgical instruments, and orthopedic components requiring biocompatibility, superior corrosion resistance, and mechanical reliability.
Frequently Asked Questions
What is the maximum service temperature for PH13-8Mo?
How does PH13-8Mo compare to 300M alloy steel?
What heat treatment is required to achieve H1025 condition?
Can PH13-8Mo be used for critical aerospace fasteners?
What is the machinability rating compared to other stainless steels?
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