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Five characteristics of duplex stainless steel


     Duplex stainless steel is an important product pro […]

     Duplex stainless steel is an important product produced by our company, which has five remarkable characteristics.

1、Corrosion resistance of duplex stainless steel

     Duplex stainless steel is extremely corrosion resistant. They have high resistance to inter granular corrosion. Duplex stainless steels exhibit very high resistance to stress corrosion cracking, even in chloride and sulfide environments. Super duplex stainless steel is more resistant to corrosion.

2、Heat resistance of duplex stainless steel

     The high chromium content of duplex stainless steels prevents corrosion, which can lead to embrittlement at temperatures above 300 °C. At low temperatures, duplex stainless steels have better ductility than ferritin and martensite stainless steels. Duplex stainless steels can easily be used down to at least -50 °C.

3、Manufacturing of duplex stainless steel

     All stainless steels should only be fabricated using tools designed for use with stainless steel materials. Tools and work surfaces must be spotless before use. These precautions are necessary to avoid cross-contamination of stainless steel with easily corroded metals that may discolor the surface of processed products.

4、Heat treatment of duplex stainless steel

     Duplex stainless steels cannot be hardened by heat treatment. However, they can be work hardened. Solution treatment or annealing can be accomplished by rapid cooling after heating to around 1100 °C.

5、Process ability

     While machinable, the high strength of duplex stainless steels makes machining difficult. For example, a 2205 is about 20% slower to process than a 304. Machining can be enhanced using the following rules:

      · The cutting edge must remain sharp. Blunt edges can lead to excessive work hardening.

      · The cuts should be light but deep enough to prevent work hardening on the surface of the material.

      · A chip breaker should be used to help keep chips away from the workpiece

      · The low thermal conductivity of austenite alloys causes heat to concentrate on the cutting edge. This means that coolants and lubricants are required and must be used in large quantities. 


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