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UNS - S32750

Duplex 2507 is a super duplex stainless steel intended for applications which request for exceptional strength and corrosion resistance. Alloy 2507 includes 25% chromium, 4% molybdenum, and 7% nickel. This high molybdenum, chromium and nitrogen content results in magnificent resistance to chloride pitting and crevice corrosion attack and the duplex structure provides 2507 with unique resistance to chloride stress corrosion cracking. Utilization of Duplex 2507 should be limited to applications underneath 600° F (316° C).

Expanded elevated temperature exposure can reduce both the toughness and corrosion resistance of alloy 2507. Duplex 2507 have magnificent mechanical properties. Frequently a light gauge of 2507 materials can be utilized to accomplish the same design strength of a thicker nickel alloy. The resulting savings in weight can dramatically cut the overall expense of fabrication.

  • High resistance to chloride stress corrosion cracking
  • High Strength
  • Superior resistance to chloride pitting and crevice corrosion
  • Good general corrosion resistance
  • Suggested for applications up to 600° F
  • Low rate of thermal expansion
  • Combination of properties given by austenitic and Ferritic structure
  • Good weldability and workability

  • Desalination Equipment
  • Chemical process pressure vessels, piping and heat exchangers
  • Marine Applications
  • Flue Gas Scrubbing Equipment
  • Pulp & Paper Mill Equipment
  • Offshore Oil production/technology
  • Oil and gas industry equipment

Corrosion Resistance

2507 Duplex is super duplex stainless steel that’s highly resistant to uniform corrosion by organic acids, for example formic and acetic acid. It is additionally exceedingly resistant to inorganic acids, particularly if they include chlorides. Alloy 2507 is highly resistant to carbide-related intergranular corrosion. Because of the Ferritic part of the duplex structure of the alloy it is resistant to stress corrosion cracking in warm chloride containing situations. Through increments of chromium, molybdenum and nitrogen restricted corrosion, for example, pitting and crevice attack is enhanced. Alloy 2507 has excellent localized pitting resistance.


Low speeds and constant feeds will minimize this alloy´s propensity to work harden. Harder than 304 and 316 stainless steel with a long stringy chip, the utilization of chip breakers is recommended.


Because of its characteristically higher yield strength beginning shaping pressures must be higher than those required for standard 300 series stainless steel. Low ductility will make shaping operations difficult.


Each and every technique including GTAW, SAW and GMAW can be effectively utilized. Preheating and post weld annealing is not required. Filler metal should be an adjusted ferrite/ austenite type like 2205, 2507 or 2304.

Hot Working

This is the recommended technique of shaping. It may initiate after heating to 1750-2000 F, followed by fast cooling after working. For maximum property’s material should be completely annealed after working.


Heat to 1920-2060 F (1050-1125 C), fast quench.


This material is not hardenable by heat treatment.

Chemical Composition %

0.03 Max0.24 - 0.320.8 Max0.035 Max0.02 Max24.0 - 26.01.2 MaxBalance6.0 - 8.00.5 Max3.0 - 5.0

Mechanical Properties

Tensile Strength (ksi)0.2% Yield Strength (ksi)Elongation% in 2 inches

Physical Properties

UnitsTemperature in °C
Density7.75 g/cm³Room
Specific Heat0.12 Kcal/kg.C 20°
Melting Range1410 - 1460 °C-
Modulus of Elasticity 200 KN/mm²20°
Electrical Resistivity80 µΩ.cm20°
Coefficient of Expansion13.0 µm/m °C20 - 100°
Thermal Conductivity17.0 W/m -°K20°

ASTM Specifications

Pipe / Tube (SMLS) Tube WeldedSheet / PlaterBarFittings
A 790A 789A 240A 276A 182


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