Everything You Need to Know About Duplex Stainless Steel Pipe Material
Duplex Steel S31803 Welded Pipes
Welded pipes made of duplex steel S31803, a corrosion-resistant stainless steel with nitrogen enhancement that can withstand chloride stress corrosion cracking. Since 300 series stainless steels are prone to this kind of corrosion stress cracking, it is an excellent solution for many applications.
It is frequently used in machinery for oil and gas processing and exploration, in maritime environments, and in other high-chloride settings like pulp and paper digesters and liquor tanks. Additionally, it is employed in the food and chemical industries for pipe systems, heat exchangers, and other high-temperature operating parts.
Duplex Stainless Steel Pipe Material Specification
Austenitic and ferritic microstructures coexist in the dual-phase stainless steel used to make duplex stainless steel tubing. Because of its great strength and resistance to corrosion, it is frequently utilised in piping and pressure vessel applications.
The most common DSS Pipe Material Specification are:
- ASTM A789/A790: Seamless and Welded Ferritic/Austenitic Stainless Steel Pipe Standard Specification.
- ASME SA 789/SA 790: Standard Specification for Seamless and Welded Duplex Stainless Steel Pipe in UNS S32205 and UNS S31803.
- EN 10216-5: Stainless Steel Tubes, Part 5: Seamless Steel Tubes for Pressure Purposes, Technical Delivery Conditions.
- EN 10253-4: Butt-welding pipe fittings, Part 4: Wrought austenitic and austenitic-ferritic (duplex) stainless steels with particular inspection requirements.
- ASTM A928/A928M: Ferritic/Austenitic (Duplex) Stainless Steel Pipe Electric Fusion Welded with the Addition of Filler Metal Standard Specification.
DSS Pipe Material Uses
Many applications that expose stainless steel to fluids containing chloride use welded pipes made of duplex steel S31803. In harsh conditions, these pipes are resistant to stress corrosion cracking and can sustain high temperatures.
They are known to have higher tensile strength than other varieties of stainless steel and can also resist sulfide corrosion. They are frequently employed in bleaching processes, some food processing applications, brackish water, marine environments, closed-loop water systems, and these.
They are distinguished by having a dual-phase microstructure that is around 50% austenite and 50% ferrite. This particular form of stainless steel has good oxidation resistance and is immune to pitting, crevice corrosion, and general corrosion in the majority of hostile conditions. It is thought to be twice as robust as austenitic stainless steel grades and has a high fatigue strength.
