High-Strength Stainless Steel for Critical Applications
PH 13-8 Mo is a martensitic precipitation-hardening stainless steel combining very high strength with excellent toughness and good resistance to corrosion and stress-corrosion cracking.
Also identified as UNS S13800, the alloy is used for highly stressed components across the aerospace, motorsport, nuclear, petrochemical and advanced engineering industries.
At Ti-Tek, we can help source PH 13-8 Mo stainless steel in the form and dimensions required for your project. Contact our team to discuss your material specification, heat-treatment condition, certification requirements and lead time.
What Is PH 13-8 Mo Stainless Steel?
PH 13-8 Mo is a precipitation-hardening stainless steel with a nominal composition that includes:
- 13% chromium
- 8% nickel
- 2% molybdenum
- 1% aluminium
- Balance iron
Its carefully controlled composition and heat-treatment response allow the alloy to achieve a valuable combination of strength, toughness and corrosion resistance.
PH 13-8 Mo is often considered for applications where conventional stainless steels cannot provide the required mechanical performance.
Key Properties of PH 13-8 Mo
Very High Strength
PH 13-8 Mo can achieve high tensile and yield strengths after suitable solution treatment and ageing. Its properties can be adjusted through the chosen heat-treatment condition to provide the required balance between strength and toughness.
Excellent Toughness
The alloy offers strong fracture toughness and impact resistance, including through relatively large component sections. This makes it suitable for critical parts exposed to shock, vibration and repeated loading.
Good Fatigue Resistance
PH 13-8 Mo performs well in components subjected to fluctuating stresses and repeated load cycles, making it valuable in aerospace, motorsport and other high-performance applications.
Corrosion Resistance
The chromium and molybdenum content provides good general corrosion resistance. The alloy also offers strong resistance to stress-corrosion cracking when correctly processed and used in a suitable environment.
Heat-Treatable Performance
A range of ageing conditions can be used to achieve different mechanical properties. This enables engineers to select the most appropriate balance of strength, ductility and toughness for the finished component.
PH 13-8 Mo Heat-Treatment Conditions
PH 13-8 Mo can be supplied or processed in different heat-treatment conditions. Common ageing conditions include H950, H1000, H1050, H1100 and H1150, with each providing a different balance of strength and toughness.
Lower ageing temperatures will generally produce higher strength, while higher ageing temperatures can improve ductility and toughness.
The correct condition should always be selected according to the component design, applicable specification and intended operating environment.
PH 13-8 Mo Applications
PH 13-8 Mo is used where component failure is not an option and high mechanical performance must be combined with resistance to corrosion.
Aerospace
Typical aerospace applications include:
- Landing gear components
- Structural airframe parts
- High-strength pins
- Fasteners and studs
- Actuator components
- Shafts and highly loaded fittings
Motorsport
In motorsport, components are regularly exposed to heavy loads, vibration, heat and repeated stress cycles. PH 13-8 Mo can be used for:
- High-strength bolts and fasteners
- Studs and screws
- Locking components
- Wheel and drivetrain hubs
- Transmission components
- High-load shafts
- Suspension and structural components
Its combination of strength and toughness helps components withstand extreme loads while reducing the risk of cracking under repeated stress.
Nuclear and Petrochemical
The alloy can be selected for critical equipment and components requiring high strength, durability and corrosion resistance, including:
- Valve components
- Pump and actuator parts
- Nuclear reactor components
- High-pressure equipment
- Petrochemical processing components
Tooling and Industrial Engineering
PH 13-8 Mo may also be used in specialist tooling, injection-moulding equipment and other industrial applications where high strength, dimensional stability and resistance to wear or corrosion are important.
PH 13-8 Mo Supply
Ti-Tek can assist with sourcing PH 13-8 Mo stainless steel to meet specific engineering requirements.
We do not publish a fixed list of stock dimensions because our customers’ requirements vary and material can often be sourced quickly when a particular size or form is not immediately available.
When requesting a quotation, please provide as much of the following information as possible:
- Required product form
- Dimensions
- Quantity
- Heat-treatment condition
- Material specification
- Certification requirements
- Required delivery date
Our team will confirm current availability and explore suitable sourcing options where necessary.
Why Choose Ti-Tek?
Ti-Tek supplies specialist metals to customers operating in demanding and highly regulated industries.
We provide:
- Responsive sourcing of specialist grades
- Support with material specifications
- Approved and traceable material
- Certification where required
- Cutting and processing services
- Competitive quotations
- Reliable UK and international supply
- ISO 9001, AS9100 and AS9120 quality approvals
PH 13-8 Mo FAQs
“PH” means precipitation hardening. The numbers refer to the alloy’s nominal chromium and nickel content, while “Mo” identifies the addition of molybdenum. The alloy contains approximately 13% chromium, 8% nickel and 2% molybdenum.
PH 13-8 Mo can provide a particularly strong combination of high strength, fracture toughness and resistance to stress-corrosion cracking. However, the most suitable grade will depend on the component design, heat-treatment condition, specification and operating environment.
Motorsport components must withstand shock, vibration and repeated high loads while maintaining dimensional stability. PH 13-8 Mo offers the strength and toughness required for critical fasteners, drivetrain parts, shafts, hubs and structural components.
Yes. Following the appropriate initial processing, the material can be aged at different temperatures to achieve the required balance of strength, toughness and ductility. The required condition should be stated when ordering.
We do not publish a fixed stock-size list because availability changes and requirements differ between customers. If a particular size or form is not immediately available, we can usually investigate sourcing it through our established supplier network.
Certification and traceability can be supplied according to the product and specification ordered. Please tell us what documentation you require when submitting your enquiry.
Discuss Your PH 13-8 Mo Requirements
Contact Ti-Tek with your required form, dimensions, quantity, heat-treatment condition and material specification. Our team will check availability and provide a tailored quotation for your project.