2507 (UNS S32750/1.4410/F53) is a high purity nickel-chromium-molybdenum (Ni-Cr-Mo) alloy that is designed for applications requiring the highest strength and corrosion resistance.
The super duplex stainless steel pipe has excellent resistance to stress corrosion cracking due to its inherent resistance to hydrogen embrittlement with a high level of oxidation resistance. The alloy also has good machinability, which makes it ideal for processing by CNC machining or grinder cutting.
Chemical Composition, % of 2507 (UNS S32750/1.4410/F53)
|24.0-26.0||6.0-8.0||3.0-5.0||0.030 Max||.24-.32||1.20 Max||0.80 Max||0.50 Max||0.035 Max||0.020 Max||Balance|
PREN = [Cr%] = 3.3 [Mo%] = 16 [N %] ≥ 40
Mechanical Properties of UNS S32750 Super duplex stainless steel pipes
|0.2% Offset Yield Strength, ksi||80 min.|
|Ultimate Tensile Strength, ksi||116 min.|
|1% Offset Yield Strength, ksi||91 min.|
|Elongation in 2 inches, %||15 min.|
|Hardness, Rockwell C||32 max|
|Impact Energy, ft-lbs||74 min.|
Super duplex stainless steel pipes are designed to have superior mechanical properties, including:
- Hardness (temperature) and toughness (temperature).
The yield strength of super duplex stainless steel can be anywhere from 3000-3500 MPa. The tensile strength is around 8000 MPa while the elongation at break is less than 20%. It has excellent impact resistance and resistance to corrosion in acid environments such as sulfuric acid or nitric acid, which makes it ideal for applications where corrosive materials must be transported through a pipeline system with minimal risk of damage to the product being transported within its walls.
Low Temperature Impact Properties of 2507 (UNS S32750/1.4410/F53)
Elevated Temperature Tensile Properties of 2507 (UNS S32750/1.4410/F53)
|0.2% Offset Yield Strength, ksi||80||65||61||58||55|
|Ultimate Tensile Strength, ksi||116||101||98||95||94|
Values obtained for hot rolled plates (th ≤ 2″). Alloy 2304 must not be used for a long time at temperatures higher than 300°C (572°F), where precipitation hardening phenomenon occurs.
Physical Properties of 2507 (UNS S32750/1.4410/F53)
Density : 7,800 kg/m3 – 0.28 lb/in3
| Interval |
| Thermal |
|°C|| Resistivity |
| Thermal |
| Specific |
| Young |
| Shear |
Corrosion Resistance of UNS S32750 Super duplex stainless steel pipes
The corrosion resistance of stainless steel pipe is due to its high chromium content, which limits the dissociation of iron in the solution. Chromium forms a thin protective film on the surface, preventing corrosion by hydrogen or oxygen ions from penetrating through its layer. This property also makes it difficult for any alkali metals such as sodium to penetrate into the pipe wall.
The ductility and formability of Super Duplex Stainless Steel Pipe make it ideal for use in applications where high pressures are exerted on materials or when required smooth surfaces must be obtained without sacrificing strength levels needed for durability purposes.
Fracture Toughness of UNS S32750 Super duplex stainless steel pipes
Fracture toughness is defined as the energy needed to break a material. It is a measure of the resistance of a material to crack initiation and propagation.
The ASTM method for measuring fracture toughness involves loading a specimen with an axial load, then applying an applied stress in one direction, before releasing it and measuring how far it deflects on each side (the deflection should be smaller than that for which the material was designed).
Weldability of UNS S32750 Super duplex stainless steel pipes
Super Duplex Stainless Steel Pipe can be welded in all positions, with all common electrodes and welding techniques. It can also be welded using all common processes, procedures, and consumables for both gas metal arc (GMA) and resistance spot welds.
UNS S32750 is a nickel-chromium-iron-molybdenum alloy. It has good weldability, excellent corrosion resistance and good formability. The combination of high strength, excellent corrosion resistance and weldability makes UNS S32750 a highly desirable material for service in highly corrosive environments with high strength required.
Hot Forming of 2507 (UNS S32750/1.4410/F53)
2507 should be hot worked between 1875 F and 2250 F. This should be followed by a solution anneal at 1925F minimum and a rapid air or water quench.
Cold Forming of 2507 (UNS S32750/1.4410/F53)
Most of the common stainless steel forming methods can be used for cold working 2507. The alloy has a higher yield strength and lower ductility than the austenitic steels so fabricators may find that higher forming forces, increased radius of bending, and increased allowance for springback are necessary. Deep drawing, stretch forming, and similar processes are more difficult to perform on 2507 than on an austenitic stainless steel. When forming requires more than 10% cold deformation, a solution anneal and quench are recommended.
Heat Treatment of 2507 (UNS S32750/1.4410/F53)
2507 should be solution annealed and quenched after either hot or cold forming. Solution annealing should be done at a minimum of 1925 F. Annealing should be followed immediately by a rapid air or water quench. To obtain maximum corrosion resistance, heat treated products should be pickled and rinsed.
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