How many kinds of stainless steel ball materials do you know?
bearings are widely used in mechanical products and engineering structures. After hot rolling, bearing steel must undergo spheroidizing annealing to globalize carbides, carbides are uniformly distributed on ferrite matrix in a small spherical shape, so that the microstructure has good processability and low overheat sensitivity, the residual carbides after quenching and returning to the stainless steel ball fire are fine and evenly distributed, so the wear resistance, bending fatigue strength and impact toughness of bearing steel are high. The rolling process has a significant effect on the microstructure of GCr15 bearing steel. In the production process of large section bearing steel bars, it is difficult to realize and control cooling in low temperature final rolling. The ultra-fast stainless steel ball cooling of the bearing steel after rolling can make the carbide fine and dispersed. Carbide in the original structure of GCr15 rolling bearing steel is evenly dispersed and distributed, which can improve its service life.
fatigue strength of stainless steel balls: high and medium frequency surface quenching greatly improves fatigue strength and reduces notch sensitivity. For workpieces of the same material, the depth of the hardened layer is within a certain range, and the fatigue strength increases with the increase of the depth of the hardened layer, but when the depth of the hardened layer is too deep, the surface layer is compressive stress, therefore, the depth of the hardened layer increases and the fatigue strength decreases instead, and the brittleness of the workpiece increases. General hardening layer depth δ = (10 ~ Natural 20)% D. More suitable, where D is the effective diameter of the workpiece, chemical heat treatment carburizing: carburizing refers to the process of carbon atoms penetrating into the steel surface layer. It is also that the workpiece of low carbon steel has a surface layer of high carbon steel, which is quenched and tempered at low temperature to make the surface layer of the workpiece have high hardness and wear resistance, however, the central part of the workpiece still maintains the toughness and plasticity of low carbon steel.
forging. Increase the forging ratio, strictly control the forging process, and prevent the core structure from being bulky after forging. Reducing the quenching water inlet temperature of bearing steel balls and increasing the outlet water temperature can obviously reduce and ease the quenching stress of workpieces. Before quenching, spheroidizing annealing is increased to refine the structure so that the workpiece is fine needle-shaped after quenching (Fine sheet)Martensite prevents coarse structure after quenching. After quenching, temper in time to eliminate quenching stress, stabilize the structure and further remove the hidden danger of workpiece cracking. Stainless steel ball is an essential thing in bearing industry and crushing industry. Common steel balls include bearing steel ball, stainless steel ball, carbon steel ball, alloy ball, etc. Among them, the bearing steel ball is a very important basic component in industrial production, and the alloy steel ball is an important part of the ball used in the crushing industry of steel balls for handicrafts. Steel balls and steel balls are widely used in plastic products for bearings, hardware, electronics, mechanical equipment, electric power, mining, cement and other fields, its production process affects the quality of its products.
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