Rolling bearing inner and outer circle and common knowledge of material - bearing roller

Of rolling bearing and rolling body of inside and outside the circle should be has high hardness and contact fatigue strength, good abrasion resistance and impact toughness of chromium manganese is commonly used in high carbon steel ( Pitting) Materials for manufacturing, commonly used GCr15 bearing steel, GCr15SiMn, GCr6 bearing steel, bearing steel GCr9 bearing steel, hardness is not lower than 61 HRC - after quenching 65HRC。 Bearing steel below the bearing network according to understand, summed up the relevant rolling bearings commonly used the use of various materials bearing steel performance, mainly has the following kinds: GCr15 bearing steel GCr15 bearing steel is an alloy content is less, has a good performance, the most widely used high carbon chromium bearing steel. After quenching and tempering with high and uniform high hardness, good abrasion resistance and contact fatigue performance. Plastic medium, the cold working steel cutting performance, welding performance is poor, is sensitive to form white performance is big, has a temper brittleness. GCr15 bearing steel, including c0. 95 - 1. 05年,Mn0。 25 - 0. 45,Si0。 15 - 0. 35. Comprehensive performance is good. Spheroidizing annealing has good machinability. After quenching and tempering hardness and uniform, high wear resistance and contact fatigue strength. Hot working performance is good. Contain less alloy elements, the price is cheaper. GCr15SiMn bearing steel GCr15SiMn abrasion resistance and hardenability is higher than GCr15 bearing steel, cold plastic deformation medium, poor weldability, sensitive to white dot form, heat treatment of temper brittleness. Used in the manufacture of wall thickness & gt; 12mm. A diameter of 250 mm or ring; A diameter of 50. 8 - 203. 2 the ball diameter & gt; 22 mm roller; In addition can also be requested high hardness, high wear resistance of other mechanical parts, such as roll. Spiral gage, etc. GCr15SiMn is high carbon steel, high chromium bearing steel, than GCr15 steel has higher wear resistance and hardenability. In the critical quenching oil diameter of 90 ~ 110 mm ( Volume fraction is 50% martensite) And 840 ° C oil cooling quenching, the 350 ° C tempering state, and then to light hardening, surface hardness is 1096 hv, hardening layer depth can be up to 1 mm. Aiming at the shortcomings of the forming roller heat treatment process, the use of thin side cooling, cooling the martensitic transformation, produce austenite or sorbite, strengthened toughness, reduce stress, and the overall quenching meet the process requirements. Cold processing, and can improve the dimension stability of bearing, or martensite interrupted quenching, to stabilize the retained austenite, high dimensional stability and high toughness. The steel generally is not recommended for forging. Usually used after quenching and low temperature tempering. GCr6 GCr6 bearing steel bearing steel measuring tool cutting steel, the steel composition GCr6 bearing steel and its hardenability, hardness and wear resistance are relatively high carbon tool steel, heat treatment when little size change. Widely used as a measuring tool, such as sample, card board, the sample set, gauge, gauge block, ring gauges and plug gauges and sample column, etc. , can also be used in the manufacture of wire drawing die and cold heading die, cold work die and the material tool cutting at low speed is not too hard. GCr9 high abrasion resistance and hardenability GCr6 than steel, bearing steel cutting machining, cold strain and plastic medium, poor weldability, is more sensitive on white dots to form, heat treatment has a tendency to temper brittleness. Used in the manufacture of diameter of 13. 5 - 25. 4 mm steel ball, diameter of 10. 3 - 18. 5 mm of the tapered roller, diameter of 9. 4 - 17. 2 cylindrical roller diameter and 9. 2 - 17. 1 spherical roller. GCr9 steel is an alloy content is less, has a good performance, the most widely used high carbon chromium bearing steel. Has the high hardness after quenching and tempering, uniform organization, good wear resistance, high contact fatigue performance. Plastic medium, the cold working steel cutting performance, welding performance is poor, is sensitive to form white performance is big, has a temper brittleness. Is used mainly for internal combustion engine, electric locomotives, automobiles, tractors, machine tools, rolling mill, boring machine, mining machinery, general machinery, mechanical transmission and high-speed rotating a high load bearing of steel ball, roller and ring. In addition to do ball bearing, bearing ring thereof, and sometimes also used to make tools, such as punching die, measuring tool.