13-8Mo Stainless Steel – Premium Precipitation-Hardening Alloy for Aerospace, Nuclear & Petrochemical Applications
13-8Mo (UNS S13800 / 1.4534) is a martensitic precipitation-hardening stainless steel that delivers an exceptional combination of high strength, superior toughness, excellent fracture toughness, and outstanding resistance to stress corrosion cracking. With approximately 13% chromium and 8% nickel content, 13-8Mo offers reliable mechanical properties under severe environmental conditions.
ZYTC Alloy is proud to announce the successful completion and delivery of a 13-8Mo Stainless Steel Bar order to Turkey, manufactured in strict accordance with AMS 5629E. Multiple specifications were produced with full compliance to our rigorous standardized, process-driven, and professional production and inspection protocols. Every product passed final inspection before shipment – because at ZYTC Alloy, quality is never compromised, regardless of order quantity.
Chemical Composition of 13-8Mo (AMS 5629E / UNS S13800)
The precisely balanced chemistry of 13-8Mo is achieved through double vacuum melting (VIM-VAR) , ensuring low gas content, improved homogeneity, and superior cleanliness.
| Element | Weight % (Min) | Weight % (Max) |
|---|---|---|
| Chromium (Cr) | 12.25 | 13.25 |
| Nickel (Ni) | 7.50 | 8.50 |
| Molybdenum (Mo) | 2.00 | 2.50 |
| Aluminum (Al) | 0.90 | 1.35 |
| Carbon (C) | – | 0.05 |
| Manganese (Mn) | – | 0.20 |
| Silicon (Si) | – | 0.10 |
| Phosphorus (P) | – | 0.010 |
| Sulfur (S) | – | 0.008 |
| Nitrogen (N) | – | 0.10 |
| Iron (Fe) | Balance | Balance |
Reference: AMS 5629E, ASTM A564
Mechanical Properties of 13-8Mo – Typical Values (Bar, AMS 5629)
13-8Mo achieves a wide range of mechanical properties through various single-cycle low-temperature aging treatments.
| Condition | Ultimate Tensile Strength (ksi) | 0.2% Yield Strength (ksi) | Elongation % in 2D | Reduction of Area % | Rockwell C Hardness |
|---|---|---|---|---|---|
| H950 | 220 | 205 | 10 | 45 | 45 |
| H1000 | 205 | 190 | 10 | 50 | 43 |
| H1025 | 185 | 175 | 11 | 50 | 41 |
| H1050 | 175 | 165 | 12 | 50 | 40 |
| H1100 | 150 | 135 | 14 | 50 | 34 |
| H1150 | 135 | 90 | 14 | 50 | 30 |
Physical Properties of 13-8Mo
| Property | Value |
|---|---|
| Density | 7.76 – 7.80 g/cm³ |
| Melting Range | 1404 – 1440 °C |
| Thermal Conductivity (20°C) | 12.8 W/m·°C |
| Coefficient of Thermal Expansion (20-100°C) | 10.4 – 13.0 µm/m·°C |
| Elastic Modulus | ~197 GPa |
Reference: ASM MatWeb, Carpenter Technology
Applications of 13-8Mo
13-8Mo is widely used in critical, high-stakes applications across multiple industries:
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✈️ Aerospace & Defense: Aircraft components, landing gear, structural sections, engine parts, missile components, fasteners, gears
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⚛️ Nuclear Industry: Nuclear reactor components, valves, pumps
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🛢️ Oil & Gas: High-pressure fittings, valves, pumps, petrochemical equipment
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🏭 Industrial Equipment: Injection molding equipment, water jet cutting equipment
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🔩 Fasteners & Hardware: Screws, bolts, pins, shafts, fittings
13-8Mo vs 17-4PH – Key Differences
While both 13-8Mo and 17-4PH are precipitation-hardening stainless steels used in high-strength applications, 13-8Mo offers distinct advantages:
| Property | 13-8Mo (UNS S13800) | 17-4PH (UNS S17400) |
|---|---|---|
| Toughness | Superior fracture toughness | Moderate |
| Stress Corrosion Cracking Resistance | Excellent | Good |
| Corrosion Resistance | Better (superior pitting resistance) | Good |
| High Strength at Thick Sections | Excellent | Limited |
| Typical Applications | Aerospace, nuclear, critical components | General high-strength, cost-sensitive |
| Cost | Higher | Lower |
13-8Mo exhibits higher strength levels due to greater precipitate strengthening and lath strengthening. Its average pitting potential and passive region are larger than those of 17-4PH, indicating superior corrosion resistance in aggressive environments.
Production Standards & Product Forms
ZYTC Alloy manufactures 13-8Mo in full compliance with international standards:
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ASTM A564 – Bars and Shapes
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ASTM A693 – Sheet and Strip
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ASTM A705 – Forgings
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AISI XM-13 / UNS S13800 / JIS SUS 632
We supply 13-8Mo in a comprehensive range of product forms:
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📦 Bars (Round, Square, Flat, Hex) – AMS 5629, ASTM A564
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📦 Sheets & Plates – ASTM A693
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📦 Strip – ASTM A693
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📦 Wire – ASTM A564
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📦 Tubes & Pipes
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📦 Forgings – ASTM A705
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📦 Custom machined components to customer drawings
ZYTC Alloy – Your Trusted 13-8Mo Partner
At ZYTC Alloy, we pride ourselves on:
✅ Standardized Production – Every order follows strict, documented procedures
✅ Process-Driven Quality – From melting to final inspection, no shortcuts
✅ Professional Expertise – Experienced metallurgists and quality engineers
✅ Fast Delivery – Competitive lead times without compromising quality
✅ Competitive Pricing – Value without sacrificing performance
✅ Custom Solutions – We accept drawings for custom machining of 13-8Mo components
Our recent successful delivery of AMS 5629E 13-8Mo Stainless Steel Bar to Turkey demonstrates our commitment to excellence. Multiple specifications, one standard of quality – ZYTC Alloy delivers.
Contact ZYTC Alloy today for your 13-8Mo requirements – bars, sheets, strips, wires, tubes, forgings, or custom components. 13-8Mo excellence, delivered globally.
