304 stainless steel are widely used in produce the stainless steel plate, stainless steel pipe, stainless steel fitting, stainless steel bar/rod, and other stainless steel fittings. Here we analysis the performance of the 304 stainless steel products as following:
304 stainless steel has good intergranular corrosion resistance performance, excellent corrosion resistance, cold working, and stamping performance which can be used as heat resistance stainless steel. At the same time, this steel -180℃under the condition of the mechanical properties still good. In a state of solid solution plasticity and toughness of steel, cold work ability is good; In oxidizing acid and atmospheric corrosion resistance, water and other medium. As a result, 304 stainless steel pipe production and consumption is the biggest, the most widely application scope of steel grade.
304 stainless steel has good cold and hot working performance, can be used in all kinds of cold and hot working process, general forging materials, stainless steel rod, stainless steel wire, stainless steel sheet, stainless steel strip, wire and other metallurgical products, hot working temperature range of 900-1180 ℃. Cold working will be easier, no special difficulty, because of two kinds of steel is easy to be cold hardening, when cold deformation is too large, must be in the middle of annealing treatment, for further processing.
1. Heat treatment process
304 stainless steel pipe with solid solution treatment temperature of 1080-1100 ℃, cooling water or air cooling.Cold intermediate annealing temperature more than in 850-970 ℃, heat preservation water after a certain time.After solid solution treatment organizations for austenitic steel, sometimes there is also a small amount of ferrite.
304 stainless steel tube restrain the carbide precipitation when welding, welding can use generic methods. Manual electric arc welding, carbon 0.04% - 0.04% of the thin section size of 304 stainless steel can be adopted the 002 electrode, don't produce inter-crystalline corrosion tendency after welding, the thick section, to keep the inter-granular corrosion resistance after welding, the need to heat treatment after welding and without heat treatment, should be changed to austenitic stainless steel 304L stainless steel or stable.
3.Cold forming performance
304 stainless steel thin plate in the application process, often used in cold forming operation.The cold forming performance is smooth shape and yield of the measure of important technical indicators.The cold forming factors influencing the 304 stainless steel is more, is also very complex.In terms of its metallography factor mainly is a result of steel composition, namely the ratio of Chromium and Nickel equivalent to the conventional tensile properties of elongation index is an important characterization.In order to obtain good cold forming performance, should be controlled in the steel ratio of Chromium and Nickel equivalent in an appropriate range.
Equipment used for food, it also are widely used in general chemical equipment, atomic energy industrial equipment parts, etc.Suitable for deep drawing parts and acid pipeline, container, etc.Vehicles, auto parts boxes, home appliances are using this material. It is in the austenitic stainless steel production and consumption of steel, most used in the production of thin-walled, acid pipeline and parts, etc.Also often use for Chromium and Nickel stainless steel and stainless steel welding core material, non magnetic components and use components in low temperature environment.