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Duplex stainless steels are roughly twice as strong as regular austenitic or ferritic stainless steels. Duplex stainless steel has the same properties as austenitic steel but is more corrosion-resistant. This is a major advantage over its austenitic counterparts. Duplex stainless steels are also lighter and more durable than their austenitic counterparts. Because they have twice the strength of ordinary stainless steels, they can be used in thin sections. This is particularly beneficial for pressure vessels and other structural applications. However, duplex steels are brittle at high temperatures and are best avoided for high-temperature environments.
Toughness and ductility: Duplex stainless steels outperform ferritic grades in toughness and ductility, though they are not as soft as austenitic grades.
Corrosion resistance: As with all stainless steels, corrosion resistance is primarily determined by the stainless steels composition, with chromium, molybdenum, and nitrogen content being the most important. Duplex stainless steels are extremely corrosion resistant, and they exhibit very high resistance to stress corrosion cracking even in chloride and sulphide environments (SCC). SCC is a type of corrosion that occurs when the following conditions are met: Tensile stress, corrosive environment, and a sufficiently temperature
Heat Resistance: Compared to austenitic steels, duplex stainless steel has higher heat conductivity and lower thermal expansion. Duplex grades are easily used down to temperatures of at least -50°C because they have greater ductility at low temperatures than ferritic grades of steel.
Duplex stainless steels are less expensive than austenitic stainless steels because they contain less nickel and molybdenum. Because of the lower alloying content, duplex stainless steels can be less expensive. Furthermore, because duplex stainless steel has a higher yield strength, it may be possible to reduce its thickness. Thinner products can result in significant reduction in weight.
| Specification | ASTM A790 / ASME SA790 |
| Size | 5.0 mm – 1219.2 mm |
| Outside Diameter | 6.00 mm OD up to 914.4 mm OD, Sizes up to 24” NB available Ex-stock, OD Size Steel Tubes available Ex-stock |
| Finish | Polished, AP (Annealed & Pickled), BA (Bright & Annealed), MF |
| Thickness Range | 0.3mm – 50 mm, SCH 5, SCH10, SCH 40, SCH 80, SCH 80S, SCH 160, SCH XXS, SCH XS |
| Type | Seamless / ERW / Welded / Fabricated / CDW |
| Form | Round Pipes/Tubes, Square Pipes/Tubes, Rectangular Pipe/Tubes, Coiled Tubes, “U” Shape, Pan Cake Coils, Hydraulic Tubes |
| Length | Single Random, Double Random & Required Length End: Plain End, Beveled End, Treaded |
| End Protection | Plastic Caps |
| Surface Finish | 2B, No.4, No.1, No.8 Mirror Finish for Duplex Steel Pipes, Finish as per customer Requirements |
| Delivery Condition | Annealed and Pickled, Polished, Bright Annealed, Cold Drawn |
| Schedule | SCH5, SCH10, SCH40, STD, SCH80, SCH160 |
| Pipe End | Plain End, Beveled End, Treaded. |
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