comparison and difference between duplex stainless steel ...
Due to the features of both-In terms of phase structure, DSS combines the advantages of ferrite stainless steel and OHL stainless steel through proper control of chemical composition and heat treatment process.Features of duplex stainless steel: 1. the advantages of duplex stainless steel are as follows compared with Austrian stainless steel: (1) yield strength is more than twice that of ordinary Austrian stainless steel, and has enough plastic toughness required for molding.Tank or pressure vessel produced with duplex stainless steel has a wall thickness reduction of 30-50%, to reduce costs.(2) with excellent resistance to stress corrosion cracking, even with duplex stainless steel of mass fraction, bio stainless steel has higher resistance to corrosion, especially in cl-ion environmentStress corrosion is a difficult problem to solve in ordinary stainless steel.(3) the corrosion resistance of the most commonly used 2205 duplex stainless steel is better than that of ordinary stainless steel. the corrosion resistance of super duplex stainless steel is high, and then some media, such as acetic acid, acetic acid, etc.It is even possible to replace augh stainless steel with high alloy, Ball net, and even corrosion-resistant alloy.(4) it has good resistance to local corrosion, and its wear-resistant corrosion and fatigue corrosion properties are better than those of Austrian stainless steel compared with the alloy content of Austrian stainless steel.(5) large expansion coefficient of bio stainless steel wire, close to carbon steel, suitable for connection with carbon steel, has important engineering significance, such as the production of composite panels or lining.(6) both under dynamic load and static load conditions, bio stainless steel should have higher energy absorption ability and which structural components can cope with emergencies such as collisions and explosions., double-It has obvious advantages and practical application value.Compared with the Austrian stainless steel, the disadvantages of duplex stainless steel are: (1) universal, multi-purposeFor example, as an OHS stainless steel, its use temperature must be controlled below 250 below.(2) its plastic toughness is lower than that of stainless steel, and its cold and hot working processes and forming properties are not as good as those of stainless steel.(3) the existence of a temperature brittle zone requires strict control of the heat treatment and welding process system to avoid the occurrence of harmful phases and damage the performance.2. compared with ferrite stainless steel, the advantages of duplex stainless steel are as follows: (1) the comprehensive mechanical properties are better than ferrite stainless steel, especially the plastic toughness is better, and it is not iron steel like brittle-sensitive stainless steel.(2) in addition to stress-resistant corrosion, the performance of other local corrosion resistance is better than that of ferrite stainless steel.(3) the cold processing process and cold forming performance are obviously better than that of ferrite stainless steel.(4) The welding performance is far better than that of stainless steel. Generally, the welding is not preheated and the heat treatment is not after welding.(5) The application range is wider than that of stainless steel.