Duplex Stainless Steel Coil
One is that duplex stainless steel with chromium content in the range of 18%-22% has excellent neutral chloride stress corrosion resistance under low stress conditions. 18-8 austenitic stainless steel, which is usually used in neutral chloride solutions above 70Y, is more prone to stress corrosion cracking, and heat exchangers made of this type of stainless steel are used in industrial media with trace amounts of chloride and hydrogen sulfide Equipment such as evaporators and evaporators are prone to stress corrosion cracking, but duplex stainless steel has good resistance.
The second is that chromium-containing duplex stainless steel has good corrosion resistance. When having the same pitting equivalent value, the critical pore corrosion potential of duplex stainless steel and austenitic stainless steel is relatively similar. The pitting corrosion resistance of duplex stainless steel containing 18% chromium is equivalent to that of 316L. Duplex stainless steel containing 25% chromium, especially nitrogen-containing high-chromium duplex stainless steel, has higher pitting and crevice corrosion resistance than 316L stainless steel.
The third is that it has good corrosion resistance fatigue and wear corrosion performance, and is used to make pumps, valves and other equipment under certain corrosive medium conditions. In addition, the comprehensive mechanical properties of duplex stainless steel are relatively good, with high strength and fatigue strength, and the yield strength is twice that of 18-8 austenitic stainless steel.
The welding performance of duplex stainless steel is also very good, and the hot cracking tendency is low. Usually no preheating is required before welding, and no heat treatment is required after welding. It can be welded with dissimilar steels such as 18-8 austenitic stainless steel and carbon steel.
The thermal processing temperature range of duplex stainless steel with too low chromium content is wider than that of 18-8 austenitic stainless steel, and the material resistance is also smaller. It can be directly rolled to produce stainless steel plates without forging. Duplex stainless steel with higher chromium content The thermal processing of phase stainless steel is more difficult than that of Austenitic stainless steel.
Compared with austenitic stainless steel, duplex stainless steel has a larger thermal conductivity and a smaller linear expansion coefficient, and is suitable for manufacturing heat exchanger tube cores.
But duplex stainless keys also have some disadvantages. One is that compared with Austenitic stainless steel, duplex stainless steel has lower heat resistance, and it is usually controlled to be used in a working environment below 300Y. The second is that the work hardening effect of cold working is greater than that of 18-8 austenitic stainless steel. In the initial stage of deformation of stainless steel pipes and plates, higher force must be applied to produce deformation, and the internal stress generated by stainless steel pipes and plates is also greater. . The third is that there is a medium-temperature brittle zone in duplex stainless steel, which is not conducive to heat treatment and welding. In addition, duplex stainless steel with a chromium content of about 25% is more difficult to process than austenitic stainless steel.

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