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UNS 32750 Duplex Stainless Steel Specification
Importer, Stockholder, Supplier and Exporter's of UNS 32750 Duplex Stainless Steel Pipes & Tubes in India
DUPLEX 2205
ASTM A 182, A 240, A 276,
A 789, A 790, A 815
UNS S31803, S32205
NACE MR0175
Forms of Duplex 2205 Available at K.M STeel India
Sheet
Plate
Bar
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)
Welding Wire and Welding Electrode
Stainless Steel 22052205 Duplex Overview
Duplex 2205 is a nitrogen enhanced duplex stainless steel that was developed to combat common corrosion problems encountered with the 300 series stainless steels. “Duplex” describes a family of stainless steels that are neither fully austenitic, like 304 stainless, nor purely ferritic, like 430 stainless. The structure of 2205 duplex stainless steel consists of austenite pools surrounded by a continuous ferrite phase. In the annealed condition, 2205 contains approximately 40-50% ferrite. Often referred to as the work horse grade, 2205 is the most widely used grade in the duplex family of stainless steels.
The advantage of a duplex structure is that it combines the favorable qualities of a ferritic alloy (stress corrosion cracking resistance and high strength) with those of an austenitic alloy (ease of fabrication and corrosion resistance).
Usage of 2205 Duplex stainless steel should be limited to temperatures below 600° F. Extended elevated temperature exposure can embrittle 2205 stainless.
Corrosion Resistance
2205 duplex stainless steel is a cost effective solution for many applications where the 300 series stainless steels are susceptible to chloride stress corrosion cracking. Stress corrosion cracking occurs when stainless steels are subjected to tensile stress, while in contact with solutions containing chlorides. Increasing temperatures also increase the susceptibility of stainless steels to stress corrosion cracking.
Standards
ASTM/ASME .......... A240 - UNS S32750
EURONORM............ 1.4410 - X2 Cr Ni MoN 25.7.4
AFNOR.................... Z3 CN 25.06 Az
Benefits of UNS32750 Super Duplex Stainless Steel
Crevice Corrosion
The presence of crevices, almost unavoidable in practical constructions and operations, makes stainless steels more susceptable to corrosion in chloride enviroments. 2507 is highly resistant to crevice corrosion. The critical crevice corrosion temperatures of 2507 and several other high-performance stainless steels are shown above.
Mechanical Properties
Mechanical and Physical Properties
2507 combines high tensile and impact strength with a low coefficient of thermal expansion and high thermal conductivity. These properties are suitable for many structural and mechanical components. The low, ambient, and elevated temperature mechanical properties of 2507 sheet and plate are shown below. All of the test data shown are for samples in the annealed and quenched condition.
2507 is not recommended for applications which require long exposures to temperatures in excess of 5700F because of the increased risk of a reduction in toughness. The data listed here are typical for wrought products and should not be regarded as a maximum or minimum value unless specifically stated.
Mechanical Properties
| C | Cr | Ni | Mo | N | Others |
| 0.020 | 25 | 7 | 4.0 | .27 | S=0.001 |
| Temperature 0F | RT | 34 | -4 | -40 |
| Ft.-lbs. | 162 | 162 | 155 | 140 |
| Temperature 0F | -76 | -112 | -148 | -320 |
| Ft.-lbs. | 110 | 44 | 30 | 7 |
Elevated Temperature Tensile Properties
| Temperature 0F | 68 | 212 | 302 | 392 | 482 |
| 0.2% Offset Yield Strength, ksi | 80 | 65 | 61 | 58 | 55 |
| Ultimate Tensile Strength, ksi | 116 | 101 | 98 | 95 | 94 |
Physical Properties
| Density | lb/in3 | 0.28 |
| Modulus of Elasticity | psi x 106 | 29 |
| Coefficient of Thermal Expansion 68-2120F/0F | x10-6/0F | 7.2 |
| Thermal Conductivity | Btu/h ft 0F | 8.7 |
| Heat Capacity | Btu/lb/0F | 0.12 |
| Electrical Resistivity | W-in x 10-6 | 31.5 |
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