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Duplex 2205 Premium Stainless Steel Alloy

  • Sunday, 12 January 2025
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Duplex 2205 Premium Stainless Steel Alloy

Duplex 2205 is a super austenitic premium stainless grade that is designed to provide improved resistance to stress corrosion cracking and pitting/crevice corrosion compared with the standard austenitic grades such as 316L and 317L.duplex 2205 stainless steel alloy This alloy is a cost-effective alternative to higher nickel grades and can be used in a wide range of applications, especially those that require resistance to chlorides, sulfides and harsh environments.

Originally developed for the pulp and paper industry, this duplex steel has high resistance to corrosive materials in aggressive applications like those found in oil & gas, marine and petrochemical plants.duplex 2205 stainless steel alloy This grade provides superior chloride corrosion resistance in comparison to other 300 series stainless steels as well as increased strength and excellent weldability.

This alloy has a higher tensile strength than conventional austenitic grades as well as a higher yield strength.duplex 2205 stainless steel alloy These properties allow for lighter fabrications with equivalent load-bearing capacity. Duplex 2205 also has higher resistance to oxidation and corrosion fatigue than standard austenitic grades. This combination of corrosion resistance and strength is especially beneficial in processing equipment that must resist both an abrasive corrosive environment and cycles of loading and unloading.

In the annealed condition, this duplex steel has almost double the strength of 316L and exhibits corrosion resistance superior to this grade in many environments.duplex 2205 stainless steel alloy It has excellent ductility and resistance to chloride stress corrosion cracking, and it is highly resistant to hydrogen sulfide and other sulfides.

Duplex 2305 is suitable for shearing, hot forming and cold forming using equipment normally used on austenitic stainless steels. However, this grade has a higher work hardening rate than conventional austenitic grades and requires forces substantially greater than those required to form 304 or 316L. Also, allowance must be made for the fact that this grade has higher spring-back than other austenitic grades.

When welding, the key is to design a welding process that will produce a weld metal with a favorable phase balance and prevent precipitation of detrimental intermetallic or non-metallic phases. This will ensure proper weldability of the alloy in both the heat-affected zone and base metal.

This grade has good notch impact toughness down to temperatures below - 40°C, even when cold worked. It can be welded with conventional austenitic weld fillers, including ER308, ER316 and ER409.

This grade should not be exposed to prolonged elevated temperatures as it is susceptible to embrittlement. When working with duplex grades, it is important to follow all applicable metallurgical practices as set out in the American Special Metals Quality Manual. This includes proper welding and annealing practices, as well as thorough examination of the finished product for signs of de-passivation, oxidation or other forms of damage that could lead to failure in service. To avoid this, all parts should be annealed following hot or cold forming and before any further use or storage. A solution anneal of 1900°F minimum is recommended followed by rapid cooling to minimize the formation of harmful intermetallic and non-metallic phases.

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