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High frequency annealing of stainless steel finished products_Kehua

by:Kehua     2022-08-07
High-frequency annealing of stainless steel products High-frequency annealing of stainless steel products, high-frequency quenching for processing equipment, energy saving, environmental protection, pentoxide and other characteristics. Mainly used in household appliances, kitchen and bathroom and other industries. The annealed material first depends on your material. If it is a sheet, it must be annealed in a continuous bright annealing furnace. The annealing temperature of 304 is basically between 1050 and 1100. During this temperature period, you can control the speed. There is a The adjustable TV value can be adjusted according to the hardness of the material you need, which can basically be controlled between 165~175HV. With the advancement of science and technology, the annealing process is gradually using high-frequency induction heating to rapidly increase the temperature of stainless steel to about 1050 degrees, followed by natural cooling (conventional annealing), or transfer it to the ammonia decomposition atmosphere protection pipeline for rapid cooling To below 100 degrees, bright annealing can be achieved. Physical phosphorus removal: The annealed strip steel is removed from the surface oxide scale. In the physical phosphorus removal process, the phosphorus breaking machine is firstly carried out, and the strip is stretched by 0.5±0.2% through the tension of the phosphorus breaking machine. , so that the oxide scale on the surface of the steel strip is detached from the stainless steel matrix; then through the shot blasting process of the shot blasting machine, it is projected to the surface of the strip steel by the throwing wheel, so that the oxide scale on the surface of the strip steel is shot blasted off the surface of the strip steel, and the strip steel is shot after blasting. Enter the pickling process; thermal annealing and pickling operation: pickling the strip steel after physical phosphorus removal treatment to obtain white-skin stainless steel coil products; cold rolling and re-pressing operation: using cold rolling mills to pickle the strip steel 5-13 passes of rolling, the final rolling thickness is 0.3mm to 6.0mm; cold annealing and pickling operation: continuous annealing of strip steel after cold rolling and re-pressing operation at 1100℃-1200℃, the annealing time is 1 minute to 3 minutes, then through electrolysis, and then through cold annealing mixed acid pickling to obtain the final re-pressed product; final product properties: mechanical properties, yield strength 200N/mm to 350N/mm2, tensile strength 600N/mm to 800N /mm2, hardness HV is 150 to 200, metallographic grade is 7.0 to 9.0; both corrosion resistance and formability meet the standards. Material SUS304 stainless steel sheet deformation hardening and annealing softening, SUS304 is a 18-8 series austenitic stainless steel, usually used as stamping washer fasteners. Since the degree of deformation of the material in each part of the stamping is different, about 15% to 40%, the degree of work hardening of the material is also different. After cold working of SUS304 stainless steel sheet, a large number of dislocations will be generated on the slip plane and grain boundary on the microscopic level, resulting in distortion of the lattice. When the distortion value is larger, the dislocation density is higher, the internal stress and lattice distortion are more serious, so that the metal deformation resistance, strength and hardness increase with the degree of deformation, and the plastic index elongation and section shrinkage rate decrease. When the work hardening reaches a certain level, if the deformation continues, there is a danger of cracking or brittle fracture, and the residual stress after forming can easily cause the self-exploding rupture of the workpiece. Under the action of the ambient atmosphere, the workpiece will automatically generate intergranular cracking (usually called 'seasonal cracking') after being placed for a period of time. Therefore, in the stamping process of SUS304 stainless steel, it is generally necessary to perform softening annealing between processes, that is, intermediate annealing, to eliminate residual stress, reduce hardness, and restore material plasticity so that the next processing can be performed.
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