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13-8 Mo Stainless Steel

13-8 Mo Stainless Steel is a martensitic precipitation/age-hardening stainless steel known for its high strength, hardness, and excellent resistance to both general and stress corrosion. Designed for critical applications in aerospace, petrochemical, and nuclear sectors, 13-8 Mo excels in demanding environments where durability and resistance to stress-corrosion cracking are essential. The alloy achieves these properties through precise chemical composition control and specialized melting processes that reduce impurities.

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Chemical Composition of 13-8 Mo Stainless Steel

Element Composition (%)
Chromium (Cr) 12.25 – 13.25
Nickel (Ni) 7.5 – 8.5
Molybdenum (Mo) 2.0 – 2.5
Aluminum (Al) 0.9 – 1.35
Carbon (C) ≤ 0.05
Manganese (Mn) ≤ 0.10
Silicon (Si) ≤ 0.10
Nitrogen (N) ≤ 0.01
Phosphorus (P) ≤ 0.01
Sulfur (S) ≤ 0.008
Iron (Fe) Balance

Technical Specifications of 13-8 Mo Stainless Steel

Physical Properties

Property Metric Imperial
Density 7.76 g/cm³ 0.280 lb/in³
Thermal Expansion 10.8 x10⁻⁶ /K 6 x10⁻⁶ /°F
Modulus of Elasticity 200 GPa 29 x10⁶ psi
Thermal Conductivity 14.0 W/m·K 97.2 BTU·in/ft²·hr·°F
Electrical Resistivity 0.8 µΩ·m 31.5 µΩ·in

Mechanical Properties by Condition

Condition Tensile Strength (MPa) Yield Strength (MPa) Elongation (%) Hardness (Rockwell C)
H950 1516 1413 10 45
H1000 1482 1379 11 44
H1050 1413 1310 13 43
H1100 1241 1034 15 37
H1150 1034 862 17 33

Thermal Properties

Property Metric Imperial
Thermal Conductivity (at 100°C) 14.0 W/m·K 97.2 BTU/in²·hr·°F
Coefficient of Thermal Expansion 10.8 x10⁻⁶ /K 6 x10⁻⁶ /°F
Specific Heat 460 J/kg·K 0.110 BTU/lb·°F

Electrical Properties

Property Value
Electrical Resistivity 0.8 µΩ·m (31.5 µΩ·in)

Product Specifications by Solitaire Steel & Engineering LLP

Product Type Standards Sizes Types Applications
Sheets & Plates ASTM A564 Thickness: 1mm – 100mm Hot Rolled, Cold Rolled Aerospace, petrochemical, nuclear, marine
Pipes & Tubes ASTM A564 Diameter: 6mm – 500mm Seamless, Welded Structural components, oil rigs, pressure vessels
Bars ASTM A564 Diameter: 6mm – 200mm Round, Square, Hex High-strength shafts, fasteners, turbine parts
Angles, Channels, Beams ASTM A564 Custom sizes available L-Angles, U-Channels Structural frameworks in aerospace, marine
Fittings ASTM A564 Size: 1/2″ – 36″ Buttweld, Socket Weld Precision parts for aerospace, nuclear

Processing Properties

  • Heat Treatment:
    • Solution Treatment (Condition A): Heat to 1700°F (927°C) for 1 hour, then cool below 60°F for transformation to martensite. Air or liquid quenching is used based on section size.
    • Age Hardening: Performed at specified temperatures (e.g., H950, H1000) for 4 hours to achieve required strength and hardness.
  • Machining: Good machinability in solution-treated condition; optimal results in H1150M condition.
  • Welding: Suitable for inert-gas shielded or resistance welding. Preheat is not generally required. Welding can be followed by direct aging or solution treatment for best properties.
  • Hot Working: Heat uniformly to 2150°F, forging must be done above 1750°F. Cool in air and solution treat before aging.

Applications of 13-8 Mo Stainless Steel

13-8 Mo Stainless Steel is ideal for high-stress applications across sectors like aerospace, nuclear, and petrochemical:

  • Aerospace: Engine components, landing gear, structural sections.
  • Nuclear: Reactor components, high-strength parts.
  • Industrial: Valves, fasteners, pins, fittings, and shaft applications.
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