Alloy 25-6 Mo
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Alloy 25-6 Mo - High-Performance Duplex Stainless Steel
Alloy 25-6 Mo is a high-strength, corrosion-resistant duplex stainless steel that contains a significant amount of molybdenum and other alloying elements. It is specifically designed for applications where high resistance to pitting, crevice corrosion, and stress corrosion cracking (SCC) is required, particularly in highly corrosive environments such as seawater, chemicals, and high-chloride environments. The alloy’s duplex structure (a mix of austenitic and ferritic phases) gives it improved strength and toughness compared to conventional stainless steels, while maintaining excellent corrosion resistance.
Alloy 25-6 Mo is particularly used in applications in marine environments, chemical processing, and oil and gas industries, where resistance to aggressive media like chloride is crucial.
Features of Alloy 25-6 Mo:
- High Corrosion Resistance: Exceptional resistance to pitting, crevice corrosion, and stress corrosion cracking, especially in environments containing chlorides, making it ideal for marine and chemical applications.
- Good Mechanical Properties: Alloy 25-6 Mo offers a good balance of high tensile strength, excellent resistance to fatigue, and good toughness, even at low temperatures.
- High Molybdenum Content: The high molybdenum content enhances the material’s resistance to both local and general corrosion, particularly in environments containing acids, chloride, and other corrosive substances.
- Duplex Microstructure: The combination of austenitic and ferritic phases in the microstructure provides a high strength-to-weight ratio and better resistance to corrosion than conventional stainless steels.
- Weldability: The alloy can be welded using standard techniques like TIG and MIG, and it resists post-weld cracking.
- Non-Magnetic: The alloy is typically non-magnetic in the annealed state, making it suitable for applications where magnetic permeability is a concern.
- Resistance to Sulfide Stress Corrosion Cracking (SSCC): Excellent resistance to SSCC in sour gas environments, making it ideal for use in the oil and gas industry.
Specifications:
- ASTM A240 (Standard Specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications)
- UNS S32520
- ASME SA240
- EN 1.4466
- BS 3181/11
These specifications highlight the alloy’s broad use in applications requiring high resistance to corrosion and stress corrosion cracking, particularly in marine and chemical processing industries.
Composition of Alloy 25-6 Mo:
Element | Percentage |
---|---|
Nickel (Ni) | 24.0-26.0% |
Chromium (Cr) | 24.0-26.0% |
Molybdenum (Mo) | 5.0-6.0% |
Iron (Fe) | Balance |
Copper (Cu) | 0.50% Max |
Carbon (C) | 0.02% Max |
Manganese (Mn) | 1.5% Max |
Silicon (Si) | 0.5% Max |
Sulfur (S) | 0.03% Max |
Phosphorus (P) | 0.04% Max |
Physical Properties:
Property | Value |
---|---|
Density | 7.9 g/cm³ |
Melting Point | 1350-1400°C (2462-2552°F) |
Hardness (BHN) | 290-330 BHN |
Tensile Strength | 620 MPa (90,000 psi) |
Yield Strength | 450 MPa (65,000 psi) |
Elongation | 25% |
Modulus of Elasticity | 200 GPa |
Thermal Conductivity | 15.3 W/m·K |
Coefficient of Thermal Expansion | 15.3 x 10^-6 /°C |