13-8Mo (EN 1.4534) is a high-strength precipitation-hardening stainless steel designed for applications where an excellent combination of strength, toughness and corrosion resistance is required. The grade is particularly valued for aerospace and high-performance engineering components that must perform reliably under dynamic load, fatigue and demanding service conditions.
Compared with more common PH stainless steels, 13-8Mo is often selected when higher fracture toughness and more consistent mechanical performance are required at comparable strength levels. The alloying concept (including molybdenum and aluminium) supports a strong precipitation-hardening response, while also improving resistance to pitting compared to simpler PH grades. As with all PH grades, final properties depend strongly on the selected heat treatment route and aging condition.
Internationally, 13-8Mo is also designated as UNS S13800 and is known as X3CrNiMoAl13-8-2. It is frequently specified to aerospace material standards such as AMS 5629. Steelinox B.V. supplies 1.4534 / 13-8Mo primarily as round bar, with certification available according to EN 10204 / 3.1.
| Element | Typical range (wt. %) |
|---|---|
| C | ≤ 0.08 |
| Si | ≤ 1.00 |
| Mn | ≤ 1.00 |
| P | ≤ 0.04 |
| S | ≤ 0.03 |
| Cr | 12.0 – 14.0 |
| Ni | 7.5 – 8.5 |
| Mo | 2.0 – 2.5 |
| Al | 0.9 – 1.4 |
| Fe | Balance |
Exact melt composition is confirmed on the EN 10204 / 3.1 certificate for the supplied batch.
| Property | Typical value (aged condition) |
|---|---|
| Tensile strength (Rm) | per standard / see EN 10204 3.1 certificate (condition-dependent) |
| Yield strength (Rp0.2) | per standard / see EN 10204 3.1 certificate (condition-dependent) |
| Elongation (A5) | per standard / see EN 10204 3.1 certificate |
| Hardness | per standard / see EN 10204 3.1 certificate |
| Fracture toughness | per standard / see EN 10204 3.1 certificate (if specified) |
Exact values are stated on the material certificate EN 10204 / 3.1. Properties depend strongly on the aging condition.
13-8Mo / 1.4534 (UNS S13800 / X3CrNiMoAl13-8-2, AMS 5629) is typically supplied in round bar. It is commonly used for highly stressed parts where a consistent microstructure, excellent mechanical performance and reliable precipitation hardening response are required.
Round bar: 10 mm – 165 mm
Other sizes and delivery conditions are available on request, depending on stock and specification.
Centerless grinding available on request. Provide diameter, tolerance class, straightness and surface finish requirements for precision shafts or components.
13-8Mo is often chosen for safety-critical and fatigue-loaded components where a high strength level must be combined with good toughness and reliable performance. Typical applications include:
13-8Mo is often selected when a combination of very high strength and good fracture toughness is required, particularly for fatigue-loaded or safety-critical parts. Compared with some other PH grades, it can provide improved toughness at comparable strength levels, depending on the selected aging condition and section size.
Mechanical properties are controlled through solution treatment followed by aging at a defined temperature. Different aging conditions produce different balances of strength and toughness. Because the delivered condition has a major influence on performance, enquiries and orders should include the required condition and any testing requirements. Delivered values are confirmed on the EN 10204 / 3.1 certificate.
It provides good resistance to atmospheric and many industrial environments. The molybdenum addition improves pitting resistance compared to simpler PH grades. Actual corrosion performance depends on surface condition, chloride exposure and temperature. For highly aggressive chemical media, higher alloyed stainless steels or nickel alloys may be more suitable.
13-8Mo is commonly associated with aerospace specifications such as AMS 5629. If your project requires a specific standard, condition or additional testing, please specify this when requesting a quote so we can align the supply route and certification accordingly.
Steelinox B.V. supplies 1.4534 / 13-8Mo primarily in round bar, typically in sizes 10 mm to 165 mm, depending on availability. Other sizes or product forms can be supplied on request.
Yes. 13-8Mo can be delivered as centerless ground bar or shafts on request. This is common for rotating and highly stressed components where tight tolerances and a defined surface finish are required. Provide tolerance, straightness and surface finish requirements when requesting a quote.
Deliveries can be supplied with an EN 10204 / 3.1 inspection certificate. The certificate confirms chemical composition, mechanical test results (where applicable) and the delivered condition, supporting traceability for demanding applications.
Certificates: EN 10204 / 3.1
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