Duplex stainless steel is called so because it consists of two phases: an austenite phase and a ferrite phase (ideally about half ferrite and half austenite). The chemical composition of this high-tech steel contains:
In this type of inox, the chromium and nickel proportions are providing for their high corrosion resistance. This can be further increased by adding molybdenum, which significantly improves the resistance of the material to pitting corrosion. Alloying with nitrogen also helps, as it additionally reduces the metal’s susceptibility to crevice corrosion and increases the material strength.
There are different types of duplex stainless alloys, which all have their properties and benefits according to their application.
1. Molybdenum containing duplex stainless steel has good resistance to chloride stress corrosion under low stress. Generally, 18-8 type austenitic stainless steel is prone to stress corrosion fracture in neutral chloride solutions above 60 ° C. Heat exchangers, evaporators, and other equipment made of this type of stainless steel in trace chloride and hydrogen sulfide industrial media have a tendency to produce stress corrosion fracture, while duplex stainless steel has good resistance.
2. Molybdenum containing duplex stainless steel has good resistance to pitting corrosion. When having the same equivalent value of pitting resistance (PRE=Cr%+3.3Mo%+16N%), the critical pitting potential of duplex stainless steel is similar to that of austenitic stainless steel. The pitting corrosion resistance of duplex stainless steel and austenitic stainless steel is equivalent to AISI 316L. The resistance to pitting and crevice corrosion of high chromium duplex stainless steel containing 25% Cr, especially nitrogen, exceeds that of AISI 316L.
3. It has good resistance to Corrosion fatigue and wear corrosion. Suitable for making power equipment such as pumps and valves under certain corrosive media conditions.
4. Good comprehensive mechanical properties. It has high strength and fatigue strength, with a yield strength twice that of 18-8 austenitic stainless steel.
The "Standard Duplex" is widely used. It is called stainless steel 1.4462, and is also known as:
Namely stainless steel 1.4162, and also known as S32101, "Lean Duplex" is also used as a slightly cheaper stainless steel grade.
"Super Duplex" stainless steel grades are another option. They are characterised by even better corrosion resistance and very high strength. The most common grade in this group is probably 1.4410, also known as 2507 or S31750.
The following materials also belong to the super duplex grades:
|Duplex Steel||1.4462||S31803 / S32205|
Stainless steel plate,stainless steel sheet (Hot rolled,cold rolled),
Stainless Steel Sheet/Stainless Steel Plate,
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ASTM A240,GB/T3280-2007,JIS4304-2005,ASTM A167,EN10088-2-2005,etc
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