UNS Number S32750

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.

 

Available Forms of Super Duplex 2507 at Rooplaxmi Steels:

•           Sheet
•           Plate
•           Bar
•           Pipe & Tube (welded & seamless)
•           Fittings
•           Wire

Characteristics of Super 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

Super Duplex 2507 Chemical Composition, %:

Cr	Ni	Mo	C	N	Mn	Si	Cu
24.0-26.0	6.0-8.0	3.0-5.0	0.03 max	0.24-0.32	1.20 max	0.80 max	0.50 max

 

P	S	Fe
0.035 max	0.02 max	Balance

 

Application of Super Duplex 2507:

•           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

Machining and Fabrication with Super Duplex 2507:

Super Duplex 2507 ASTM Specification:

Pipe Smls	Pipe Welded	Tube Smls	Tube Welded	Sheet / Plate	Bar	Fitting
A790	A790	A789	A789	A240	A276	A182

 

Welding Wire Designations:
USA AWS A5.9 – ER 2507

Mechanical Properties of Super Duplex 2507:
Specified Tensile Properties ASTM A240

Ultimate Tensile Strength	116 ksi minimum
Yield	(0.2 % offset) 80 ksi minimum
Elongation	15 %