13-8 Mo Stainless Steel Round Bar (UNS S13800)
13-8 Mo Stainless Steel Round Bar is a high-performance precipitation-hardening martensitic stainless steel offering an exceptional combination of very high strength, superior toughness, and excellent corrosion resistance. Known by UNS S13800 / AMS 5629, this alloy is specially designed to deliver uniform mechanical properties in both longitudinal and transverse directions, even in large cross-sections.
It is extensively used in aerospace, defense, and critical engineering applications where reliability under extreme stress is essential.
Key Features
- Extremely high strength after precipitation hardening
- Excellent toughness, even at cryogenic temperatures
- Superior transverse mechanical properties
- Very good resistance to stress corrosion cracking
- Good corrosion resistance in marine and industrial environments
- Minimal distortion during heat treatment
Equivalent Grades
| Standard | Grade |
|---|---|
| UNS | S13800 |
| AMS | 5629 / 5630 |
| DIN / EN | — (No direct equivalent) |
| ISO | — |
Sizes
- Diameter: 6 mm to 450 mm
- Length: 3 m, 6 m, or cut-to-length
- Tolerance: H8 / H9 / H11 or as required
13-8 Mo Stainless Steel Chemical Composition
| Element | Percentage (%) |
|---|---|
| Carbon (C) | ≤ 0.05 |
| Chromium (Cr) | 12.25 – 13.25 |
| Nickel (Ni) | 7.5 – 8.5 |
| Molybdenum (Mo) | 2.0 – 2.5 |
| Aluminum (Al) | 0.9 – 1.35 |
| Manganese (Mn) | ≤ 0.10 |
| Silicon (Si) | ≤ 0.10 |
| Phosphorus (P) | ≤ 0.015 |
| Sulfur (S) | ≤ 0.010 |
UNS S13800 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 1400 MPa |
| Yield Strength | ≥ 1200 MPa |
| Elongation | ≥ 8% |
| Hardness | 40 – 45 HRC |
SS 13-8 Mo Physical Properties
| Property | Value |
|---|---|
| Density | 7.75 g/cm³ |
| Melting Point | 1400 – 1450°C |
| Modulus of Elasticity | 200 GPa |
| Thermal Conductivity | 16 W/m·K |
| Electrical Resistivity | 0.80 µΩ·m |
Types of 13-8 Mo Stainless Steel Round Bar
- Hot Rolled Round Bar
- Cold Drawn Round Bar
- Bright Bar
- Centerless Ground Bar
- Heat-Treated Round Bar (H900–H1100)
Applications
- Aerospace structural components
- Aircraft landing gear parts
- Missile and defense components
- High-strength shafts and fasteners
- Marine and offshore hardware
- Cryogenic and high-pressure equipment
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