Designated as UNS S32750 or DIN W.Nr. 1.4410, Duplex 2507 is a super duplex stainless steel with 25% chromium, 4% molybdenum, and 7% nickel designed for demanding applications which require exceptional strength and corrosion resistance, such as chemical process, petrochemical, and seawater equipment. The steel has excellent resistance to chloride stress corrosion cracking, high thermal conductivity, and a low coefficient of thermal expansion. The high chromium, molybdenum, and nickel levels provide excellent resistance to pitting, crevice, and general corrosion.

1. Chemical Composition of Duplex 2507

The Chemical Composition of SS2507, %
C	≤0.03
Mn	≤1.2
Si	≤0.80
S	≤0.02
P	≤0.035
Cr	24.0-26.0
Ni	6.0-8.0
Mo	3.0-5.0
Cu	≤0.5
N	0.24-0.32

2. Mechanical Properties of Duplex 2507

Tensile Strength	Yield Strength	Elongation	Hardness	Impact Test
ksi(Mpa)	ksi(Mpa)	%	HRC	ft.lbf
≥110（800）	≥80（550）	≥25	≥32	≥74

* All values shall be minimum unless otherwise specified.

3. Manufacture, Heat Treatment & Weldability

Duplex 2507 piping materials can be manufactured by hot forming or cold forming methods. The hot forming temperature shall be between 1875°F and 2250°F. This should be followed by solution annealing at 1925°F minimum and a rapid air or water quench. The cold forming includes bending, deep drawing, extruding and pressing. After the cold forming process, the heat treatment of solution annealing and quenching is required. Besides, 2507 duplex stainless steels have good weldability.

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