13-8PH
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Product Description:
13-8PH (also known as 13-8 precipitation-hardening stainless steel) is a high-strength stainless steel alloy that combines the excellent corrosion resistance of chromium and the strength of precipitation hardening. It is particularly known for its exceptional combination of strength, toughness, and resistance to both general corrosion and stress corrosion cracking. The alloy is typically used in aerospace, defense, and high-performance applications that require high strength and resistance to fatigue, as well as good weldability.
Features of 13-8PH:
- High Strength: 13-8PH is capable of achieving high tensile strength (up to 1600 MPa) after heat treatment, making it ideal for applications where both strength and toughness are required.
- Good Corrosion Resistance: The alloy offers excellent resistance to corrosion, including stress corrosion cracking (SCC), and performs well in a variety of environments including marine and chemical environments.
- Precipitation Hardening: This stainless steel can be heat-treated to achieve high strength by precipitating fine particles that increase its hardness and tensile properties.
- Good Weldability: Despite its high strength, 13-8PH is weldable with standard welding methods (TIG, MIG, and others), and it maintains its mechanical properties even after welding.
- Good Toughness: It maintains good toughness and ductility even at high strength levels.
- High Fatigue Resistance: The alloy has excellent fatigue and impact resistance, which makes it useful in rotating and dynamic parts.
- Non-Magnetic: Like most austenitic stainless steels, 13-8PH is non-magnetic in the annealed condition.
Specifications:
- AMS 5629: Aerospace Material Specification for 13-8PH stainless steel bars.
- ASTM A564: Standard specification for precipitation-hardened stainless steel bars, wire, and forgings.
- UNS S13800: Unified Numbering System designation for 13-8PH stainless steel.
- MIL-S-5000: Military specification for stainless steel with high strength, including 13-8PH.
Composition of 13-8PH Stainless Steel:
Element | Percentage |
---|---|
Nickel (Ni) | 7.50 – 9.50 |
Chromium (Cr) | 12.00 – 14.00 |
Molybdenum (Mo) | 2.00 – 3.00 |
Carbon (C) | 0.07% Max |
Iron (Fe) | Balance |
Manganese (Mn) | 1.00% Max |
Silicon (Si) | 1.00% Max |
Phosphorus (P) | 0.04% Max |
Sulfur (S) | 0.03% Max |
Physical Properties:
Property | Value |
---|---|
Density | 7.85 g/cm³ |
Melting Point | 1400-1450°C (2552-2642°F) |
Hardness (Rockwell C) | 45 HRC (after hardening) |
Tensile Strength (Ultimate) | 1550 MPa (225,000 psi) |
Yield Strength | 1300 MPa (189,000 psi) |
Elongation | 8% |
Modulus of Elasticity | 200 GPa |
Thermal Conductivity | 15.2 W/m·K |
Coefficient of Thermal Expansion | 16.0 × 10^-6 /°C |