What are the common materials for the inner and outer rings of angular contact ball bearings?
The outer ring and rolling elements of angular contact ball bearings should have high hardness and contact fatigue strength, good wear resistance and impact toughness. - Generally made of chromium-manganese high carbon steel (anti-pitting corrosion), commonly used materials are GCr15 bearing steel, GCr15SIMn bearing steel, GCF6 bearing steel, GC9 bearing steel, etc. The hardness after quenching is not less than 61HRC-65HRC.
1. GCr15 bearing steel
GCr15 bearing steel is a kind of high carbon chromium bearing steel with less alloy content, good performance and the most widely used. After quenching and tempering, it has high and uniform hardness, good wear resistance and high contact fatigue performance. The steel has medium cold working plasticity, general cutting performance, poor welding performance, high sensitivity to white spot formation, and temper brittleness. GCr15 bearing steel, containing c0.95-1.05, Mn0.25-0.45, Si0.15-0.35.2. GCr1 5SiMn bearing steel
GCr1 5SiMn bearing steel has higher wear resistance and hardenability than GCr15, moderate cold working plastic deformation, poor weldability, sensitive to white spot formation, and brittleness during heat treatment. It is used to manufacture ferrules with wall thickness>12mm, outer diameter 2250mm, steel balls with diameters of 50.8-203.2, and rollers with diameters>22mm; in addition, it can also be used as other mechanical parts requiring high hardness and high wear resistance, such as roll screw gauges Wait.
3. GCr6 bearing steel
GCr6 bearing steel is used for measuring and cutting tools. The composition of this steel is equivalent to that of GCr6 bearing steel. Its hardenability, hardness and wear resistance are higher than those of carbon tool steel, and the dimensional change is not large during heat treatment. Widely used as measuring tools, such as templates, clamps, sample sleeves, gauges, block gauges, ring gauges, thread plug gauges and sample columns, etc. It can also be used to manufacture cold work dies such as wire drawing dies and cold heading dies, as well as low-speed cutting tools. too hard material.
4. GCr9 bearing steel
GCr9 steel is a kind of high carbon chromium bearing steel with less alloy content, good performance and the most widely used. After quenching and tempering, it has high hardness, uniform structure, good wear resistance and high contact fatigue performance. The steel has medium cold working plasticity, average cutting performance, poor welding performance, high sensitivity to the formation of white spots, and temper brittleness.
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