Characteristics and welding skills of 2205 Duplex Stainless Steel Pipe

Sdbfsteel Sdbfsteel

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Joined: 2021-07-30 06:45:03
2021-07-30 06:47:09

Due to the characteristics of the duplex structure, through correct control of chemical composition and heat treatment process, 2205 Duplex Stainless Steel Pipe has the advantages of both ferritic stainless steel and austenitic stainless steel. It combines the excellent toughness and weldability of austenitic stainless steel with the high strength and resistance to chloride ion stress corrosion of ferritic stainless steel. It is these superior properties that make 2205 duplex stainless steel tube have the advantages of high toughness and weldability. As a weldable structural material, stainless steel develops rapidly. Since the 1980s, it has become a steel parallel to martensite, austenitic and ferritic stainless steels.

(1) Molybdenum 2205 duplex stainless steel tube has good chlorine stress corrosion resistance under low stress. Generally speaking, 18-8 austenitic stainless steel is a solution that is prone to stress corrosion cracking in neutral chloride. Trace chlorine and hydrogen sulfide in industries above 60 ° C, heat exchangers, evaporators and other equipment are made of this Stainless steel has a tendency to stress corrosion cracking, and 2205 Duplex Stainless Steel Pipe has good resistance.

(2) Molybdenum-containing 2205 duplex stainless steel tube has good pitting corrosion. The critical pitting potential of 2205 duplex stainless steel is similar to that of austenitic stainless steel, but the equivalent value of pitting resistance is the same (pre = CR% + 3.3mo% + 16N%). The pitting corrosion performance of 2205 Duplex Stainless Steel Pipe and austenitic stainless steel is equivalent to AISI316L. Containing 25% Cr, especially the nitrogen-containing high chromium 2205 Duplex Stainless Steel Pipe, the pitting and crevice corrosion resistance is better than AISI316L.

(3) It has good corrosion fatigue resistance and wear corrosion resistance. Under certain corrosive media conditions, it is suitable for manufacturing pumps, valves and other power equipment.

(4) Good comprehensive mechanical properties. It has high strength and fatigue strength, and its yield strength is twice that of 18-8 austenitic stainless steel. The solid solution elongation rate is 25%, and the toughness value AK (V-notch) is above 100J.