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Super Duplex 2507

1.High resistance to chloride stress corrosion cracking
2.Resistance to chloride pitting and crevice corrosion
3.Good general corrosion resistance
4.Good sulfide stress corrosion resistance
5.High Strength
6.Good weldability and workability


  • DUPLEX 2507
  • Alloy1996DP2507


UNS S32750

Forms of Super Duplex 2507




Pipe & Tube (welded & seamless)

Fittings (i.e. flanges, slip-ons, blinds, weld-necks, lapjoints, long welding necks, socket welds, elbows, tees, stub-ends, returns, caps, crosses, reducers, and pipe nipples)

Duplex 2507 Overview

Duplex 2507 is a super duplex stainless steel designed for applications which demand exceptional strength and corrosion resistance. Alloy 2507 has 25% chromium, 4% molybdenum, and 7% nickel. This high molybdenum, chromium and nitrogen content results in excellent resistance to chloride pitting and crevice corrosion attack and the duplex structure provides 2507 with exceptional resistance to chloride stress corrosion cracking.

Usage of Duplex 2507 should be limited to applications below 600°F (316°C). Extended elevated temperature exposure can reduce both the toughness and corrosion resistance of alloy 2507.

Duplex 2507 possesses excellent mechanical properties. Often a light gauge of 2507 material can be used to achieve the same design strength of a thicker nickel alloy. The resulting savings in weight can dramatically reduce the overall cost of fabrication.

Corrosion Resistance

2507 Duplex is highly resistant to uniform corrosion by organic acids such as formic and acetic acid. It is alsohighly resistant to inorganic acids, especially if they contain chlorides. Alloy 2507 is highly resistant to carbide-related intergranular corrosion. Due to the ferritic portion of the duplex structure of the alloy it is very resistant to stress corrosion cracking in warm chloride containing environments. Through additions of chromium, molybdenum and nitrogen localized corrosion such as pitting and crevice attack are improved. Alloy 2507 has excellent localized pitting resistance.

What are the characteristics of Duplex 2507?

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

Chemical Composition(%)

24.0-26.06.0-8.03.0-5.00.030 Max.24-.321.20 Max
0.80 Max0.50 Max0.035 Max0.020 MaxBalance

In what applications is Duplex 2507 used?

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

ASTM Specifications

Pipe SmlsPipe WeldedTube SmlsTube WeldedSheet/PlateBarFlanges & Fittings

Mechanical Properties

Specified Tensile Properties, Plate ASTM A240

Ultimate Tensile Strength, ksi Minimum.2% Yield Strength, ksi Minimum% Elongation Min. 


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