Description
2507/1.4410 is a super duplex stainless steel that combines high strength and excellent corrosion resistance, especially in chloride environments. It features a mixed microstructure of approximately 50% austenite (γ) and 50% ferrite (α), which provides superior mechanical properties and resistance to stress corrosion cracking.
Chemical Composition
The typical chemical composition of 2507 is as follows:
Carbon (C): ≤ 0.03%
Manganese (Mn): ≤ 1.0%
Silicon (Si): ≤ 1.0%
Phosphorus (P): ≤ 0.03%
Sulfur (S): Sulfur (S):
Chromium (Cr): 24.0% - 26.0%
Nickel (Ni): 6.0% - 8.0%
Molybdenum (Mo): 3.5% - 5.0%
Nitrogen (N): 0.24% - 0.30%
Copper (Cu): ≤ 0.5%.
Mechanical Properties
The mechanical properties of 2507 at room temperature (20°C) are:
Tensile Strength (Rm): ≥ 620 MPa
Yield Strength (Rp0.2): ≥ 450 MPa
Elongation (A): ≥ 25%
Hardness: ≤ 32 HRC.
Thermal & Physical Properties
The thermal and physical properties include:
Density: 7.9 g/cm³
Melting Point: ~ 1450°C
Thermal Conductivity: 13.5 W/m•K
Specific Heat: 460 J/kg•K
Mean Coefficient of Thermal Expansion: 14.0 x 10⁻⁶/K (20-200°C) and 14.5 x 10⁻⁶/K (20-400°C).
Other Designations
UNS Number: S32750
DIN EN: 1.4410
AFNOR: Z3 CN 25.06 Az.
Fabrication and Heat Treatment
2507 can be fabricated using standard methods such as welding, machining, and forming.
Solution annealing is recommended at temperatures of 1025-1100°C, followed by rapid cooling (water or air quenching) to restore corrosion resistance and mechanical properties.
Good weldability; recommended welding processes include SMAW, GTAW, and SAW. Preheating is generally not required, but interpass temperatures should be controlled to avoid detrimental effects on the weld integrity.
Applications
2507 is widely used in various industries due to its excellent mechanical properties and corrosion resistance. Typical applications include:
Oil and gas industry equipment
Offshore platforms and heat exchangers
Chemical processing plants
Desalination plants
High-pressure RO plants
Structural components and piping systems.
Supplied Forms
2507 is available in various forms, including:
Bars and rods
Fittings and flanges
Coils.
Features
Superior resistance to pitting and crevice corrosion.
High strength and toughness.
Excellent resistance to stress corrosion cracking.
Suitable for harsh environments, including marine applications.
This datasheet summarizes the critical aspects of 2507 grade stainless steel, making it suitable for various demanding applications.
