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2507 Duplex Stainless Steel Sheet & Plate

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2507 Duplex Stainless Steel Sheet & Plate (UNS S32750, 1.4410)

2507 Duplex Stainless Steel Sheet & Plate (UNS S32750, 1.4410) is a super duplex stainless steel known for its exceptional strength, superior corrosion resistance, and durability. Designed for applications in highly demanding environments, it has a dual-phase microstructure of ferrite and austenite, providing a balance of mechanical and corrosion-resistant properties. With excellent resistance to pitting, crevice corrosion, and chloride-induced stress corrosion cracking, 2507 is widely used in the oil and gas, chemical processing, marine, and desalination industries, where exposure to harsh environments is common.

 

Key Properties 2507 Stainless Steel Sheet & Plate

  • Corrosion Resistance: Excellent resistance to pitting and crevice corrosion, particularly in chloride-rich, high-temperature settings.
  • Strength: Exceptional tensile and yield strength, allowing for lighter designs and reduced material costs.
  • Thermal Performance: Performs reliably in extreme conditions, with outstanding resistance to thermal cracking.
  • Durability: Good ductility and toughness at low and sub-zero temperatures, while maintaining excellent fatigue resistance.
  • Weldability: Suitable for welding with proper procedures to avoid thermal cracking and maintain corrosion resistance.

 

Technical Specifications

  • UNS: S32750
  • DIN: 1.4410

Available Thickness

3/16″1/4″5/16″3/8″1/2″5/8″3/4″1″1 1/4″
4.8mm6.3mm7.9mm9.5mm12.7mm15.9mm19mm25.4mm31.8mm
1 1/2″1 5/8″1 3/4″2″2 1/4″2 1/2″2 3/4″3″
38.1mm41.3mm44.5mm50.8mm57.2mm63.5mm69.9mm76.2mm
2507-duplex-stainless-steel-sheet-plate

Application

  • Automotive
  • Chemical and Pharmaceutical
  • Fertilizer
  • Food Processing and Handling
  • Manufacturing
  • Mining
  • Oil & Gas
  • Phosphate Mining

Standard

  • ASTM A240 / A240M
  • ASTM A276 / A276M
  • ASTM A312 / A312M
  • ISO 15510
  • EN 10088-2
  • IN 10204
  • HE G4304
  • HE G4305
  • ASME SA240 / SA240M

Worldwide Equivalent Grade for Duplex Stainless 2507

Country Standard Grade
United States UNS S32750
European Union EN 1.441
United States ASTM A240/A790
United States ASME SA-240/SA-790
Japan JIS SUS329J4L
China GB 00Cr25Ni7Mo4N
France AFNOR Z3CND25-07Az
Germany DIN 1.441
International ISO 1.441

Corrosion Resistance

  1. Pitting and Crevice Corrosion: 2507 has high resistance to pitting and crevice corrosion due to its high chromium (around 25%) and molybdenum (about 4%) content. These elements enhance its ability to resist localized corrosion.
  2. Stress Corrosion Cracking (SCC): 2507 exhibits excellent resistance to stress corrosion cracking, which is especially beneficial in environments with high chloride content.
  3. General Corrosion: Compared to standard austenitic stainless steels, 2507 provides superior general corrosion resistance. Its dual-phase structure allows it to resist corrosion in a wider range of environments.
  4. Intergranular Corrosion: 2507 is resistant to intergranular corrosion, a common issue in some stainless steels due to carbide precipitation along grain boundaries. This is especially true in environments where sensitization (heat-induced corrosion) might be a concern.
  5. 5Oxidation Resistance: While 2507 has good oxidation resistance at elevated temperatures, it’s not as resistant as some other high-temperature alloys. It can handle temperatures up to about 300°C (572°F) but may require special consideration for higher temperatures.

2507 Duplex Chemical Composition

ElementComposition (%)
Chromium (Cr)24.0 – 26.0
Nickel (Ni)6.0 – 8.0
Molybdenum (Mo)3.0 – 5.0
Nitrogen (N)0.24 – 0.32
Carbon (C)≤ 0.03
Manganese (Mn)≤ 1.2
Silicon (Si)≤ 0.8
Phosphorus (P)≤ 0.035
Sulfur (S)≤ 0.02
Iron (Fe)Balance

2507 Duplex Physical Properties

PropertyValue
Density7.8 g/cm³ (0.28 lb/in³)
Melting Range1350 – 1400°C (2460 – 2550°F)
Modulus of Elasticity200 GPa (29,000 ksi)
Thermal Conductivity14.2 W/m·K (8.2 BTU/ft·h·°F)
Specific Heat Capacity500 J/kg·K (0.12 BTU/lb·°F)
Electrical Resistivity0.82 µΩ·m (32.3 µΩ·in)
Coefficient of Thermal Expansion7.2 µm/m·°C (4.0 µin/in·°F)
Hardness (Rockwell C)32-35 HRC
Tensile Strength795 MPa (115 ksi)
Yield Strength550 MPa (80 ksi)

2507 Duplex Mechanical Properties

Property Value
Tensile Strength (UTS) ≥ 795 MPa (≥ 115 ksi)
Yield Strength (0.2% Offset) ≥ 550 MPa (≥ 80 ksi)
Elongation at Break ≥ 15%
Hardness (Rockwell C) 32-35 HRC
Impact Toughness ≥ 74 J (≥ 54 ft-lbf) at -50°C
Modulus of Elasticity 200 GPa (29,000 ksi)
Poisson’s Ratio 0.3
Fatigue Strength 325 MPa (47 ksi)

Fabrication Data

  • Forming: Duplex 2507 has good formability but requires higher forming forces than austenitic stainless steels. It can be cold-formed, but inter-stage annealing may be necessary to alleviate work hardening.
  • Welding: 2507 is weldable by all common welding methods, but attention must be given to control heat input and maintain interpass temperatures below 150°C (302°F) to avoid austenite-ferrite imbalance, which can lead to reduced corrosion resistance.
  • Machining: Duplex 2507 can be machined but will require slower speeds, more rigid tools, and higher feed rates compared to austenitic grades.
  • Heat Treatment: Annealing should be performed at temperatures between 1020°C and 1100°C (1868°F to 2012°F), followed by rapid cooling. This will ensure the desired microstructure and properties.
  • Surface Finish: Duplex stainless steels can be polished to achieve a high-quality finish. Care should be taken to avoid surface contamination and ensure appropriate passivation post-fabrication.
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