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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 is a super duplex alloy with a high chromium, molybdenum, and nitrogen content, designed for severe corrosion environments and extreme mechanical demands. Its dual-phase microstructure (ferrite + austenite) provides excellent strength and corrosion resistance, especially in highly acidic, chloride-rich, and marine applications.

 

Key Features:

  • Exceptional Corrosion Resistance: Outstanding resistance to pitting, crevice corrosion, and chloride-induced stress corrosion cracking.
  • High Mechanical Strength: More than twice the yield strength of 304/316 stainless steels.
  • Excellent Thermal: Conductivity & Low Thermal Expansion
  • Superior Fatigue and Impact Resistance: Even at sub-zero temperatures.

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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