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15-5 PH Stainless Steel

15-5 PH Stainless Steel is a martensitic, precipitation-hardening stainless steel with approximately 15% chromium and 5% nickel. Developed as a modification of 17-4 PH, this alloy offers high strength, hardness, and excellent corrosion resistance, along with improved ductility and transverse toughness. Known for its versatility, 15-5 PH is frequently used in aerospace, marine, and nuclear applications, thanks to its refined microstructure and excellent fabrication capabilities.

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Chemical Composition of 15-5 PH Stainless Steel

Element Composition (%)
Chromium (Cr) 14.00 – 15.50
Nickel (Ni) 3.50 – 5.50
Copper (Cu) 2.50 – 4.50
Carbon (C) ≤ 0.07
Manganese (Mn) ≤ 1.00
Silicon (Si) ≤ 1.00
Phosphorus (P) ≤ 0.04
Sulfur (S) ≤ 0.03
Niobium + Tantalum (Nb + Ta) 0.15 – 0.45
Iron (Fe) Balance

Technical Specifications of 15-5 PH Stainless Steel

Physical Properties

Property Metric Imperial
Density 7.75 g/cm³ 0.280 lb/in³
Thermal Expansion 10.8 x10⁻⁶ /K 6 x 10⁻⁶ /°F
Modulus of Elasticity 200 GPa 29 x 10⁶ psi
Thermal Conductivity 18.4 W/m·K 10.6 BTU/hr·ft·°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)
Solution Annealed (Cond. A) 1050 725 15 33
H900 1310 min 1170 min 6 40
H1025 1060 min 960 min 8 35
H1075 1000 min 860 min 9 32
H1150 930 min 725 min 11 28
H1150-M 790 min 520 min 14 25

Thermal Properties

Property Metric Imperial
Thermal Conductivity (at 100°C) 18.4 W/m·K 10.6 BTU/hr·ft·°F
Coefficient of Thermal Expansion 10.8 x10⁻⁶ /K 6 x 10⁻⁶ /°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, marine, oil & gas, nuclear
Pipes & Tubes ASTM A564 Diameter: 6mm – 500mm Seamless, Welded Chemical processing, oil rigs, heat exchangers
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 1038°C for 1 hour and air cool.
    • Age Hardening: Applied at varying temperatures (e.g., H900, H1025, H1075) to achieve different strength levels and hardness.
  • Machining: Similar to grade 304, machinable in annealed condition, with improved machinability after hardening.
  • Welding: Can be welded using standard methods. Post-weld aging recommended to match parent material properties.
  • Hot Working: Perform between 950°-1200°C, followed by solution treatment to restore properties.

Applications of 15-5 PH Stainless Steel

15-5 PH Stainless Steel is widely used in critical applications due to its high strength, hardness, and corrosion resistance:

  • Aerospace: Structural components, turbine blades, fasteners.
  • Marine: Gas turbine components, hollow shafts.
  • Nuclear: Reactor parts, high-strength components.
  • Industrial: Engine parts, gears, fittings, and valves.
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