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The basic concept of duplex stainless steel is to produce a chemical composition that creates an equal mix of austenite and ferrite. This balance of phases provides the following: Higher strength – The range of 0.2% PS for the current duplex grades is from 400 – 550 MPa.
The Duplex Tube Fittings are renowned for their dual microstructure phase. The microstructure of DSS Bulkhead Tube Fittings is an equivalent 50 % each austenite and ferrite. Therefore the Duplex Steel Instrument Tube Fittings share characteristics of both steel classes.
Duplex steel plates are flat, broad sheets of material that find applications in structural and industrial projects. Their high strength and corrosion resistance make them valuable for constructing pressure vessels, storage tanks, and various structural components.
| Property | Details |
|---|---|
| Grades | S31803 (2205), S32205, S32750 (2507), S32760, S32550, S32900, S32950 |
| Material Type | Duplex (Austenitic-Ferritic Stainless Steel) |
| Standards | ASTM A240 (Plates & Sheets), ASTM A276 (Bars), ASTM A790 (Pipes), ASTM A182 (Fittings), ISO 15156 (Oil & Gas) |
| Chemical Composition | Chromium (21-26%), Nickel (4.5-7%), Molybdenum (2.5-4%), Nitrogen (0.08-0.3%), Iron (Balance) |
| Corrosion Resistance | Excellent resistance to pitting, crevice corrosion, and stress corrosion cracking (SCC), especially in chloride environments |
| Mechanical Properties | Tensile Strength: 620 - 880 MPa, Yield Strength: 450 - 550 MPa, Higher strength compared to austenitic stainless steel |
| Applications | Oil & Gas, Chemical Processing, Marine, Desalination Plants, Paper & Pulp Industry, Pressure Vessels |
| Surface Finishes | Pickled, Polished, Brushed, No. 1 (Hot Rolled), No. 2B (Cold Rolled) |
| Heat Resistance | Good resistance to oxidation and scaling up to 300-350°C; limited use at higher temperatures due to the risk of embrittlement |
| Weldability | Good weldability with proper control of heat input and interpass temperatures to avoid phase imbalance |
| Available Forms | Plates, Sheets, Bars, Pipes, Tubes, Fittings, Fasteners |
| Advantages | High strength, superior corrosion resistance, cost-effective alternative to high nickel alloys, suitable for harsh environments |