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Analysis of the performance and use of bearing steel
Source: Bearing network time: 2018-03-10
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ㄒ唬┲岢 侄驮煳 .. 1) Initial forging temperature: 1150 (1120) final satin temperature: 850 (800) degrees.
.2) Disadvantages of the excavation table before casting; heat up as soon as possible after preheating.
.3) During warm processing; blue-brittle area of ​​200~400 degrees should be prevented. During hot processing; it should be prevented from entering high-temperature brittle area (greater than 1250). It should be prevented from entering hot fragile area (800~~950 degrees). Today's focus :
.ǘ┒ǘ┒ǘ┒笕.1) Pre-heat treatment after forging (spheroidizing annealing) End heat treatment (quenching + low temperature tempering)
.2) Spheroidizing annealing intention: lowering the hardness; facilitating processing; preparing for quenching.
Spheroidizing annealing process: heating to 750 ~ ~ 770 degrees; insulation must be time; in the cold cooling to 600 degrees below air cooling.
.3) Various bearing steel quenching + low temperature tempering and hardness table steel quenching temperature and quenching medium low temperature tempering hardness HRC
GCr6800~820 water or oil 150~17062~64
GCr9800~830 water or oil 150~17062~64
GCr9SiMn810~820 water or oil 150~16062~64
GCr15820~846 oil 150~16062~64
GCr15SiMn800~840 oil 150~17062~64
ㄈâ”慊鸺 Press 慊鸾橹.1) Harden color (experience) White is the hardest and brittle; Yellow is hard and tough; Blue is soft and tough.
.2) Quenching medium A water: usually the temperature does not exceed 40 degrees; there must be no oil; Panyu and other impurities.
B salt and alkali aqueous solution: add 5~10% salt or alkali in water.
The cooling rate of the salt solution is ten times that of water; the hardness is high and uniform; but the arrangement stress is large; there is a certain rust effect. The temperature is less than 60 degrees oil-free bearing.
Alkaline solution (caustic aqueous solution) is highly corrosive;
C oil: contains oil; spindle oil; transformer oil; diesel, etc. can reduce deformation and cracking. Not applicable carbon steel. Oil temperature: 60~~80 degrees; the highest does not exceed 100~120 degrees.
The mold steel is selected from low temperature tempering. Temperature: 150~250 degrees. Under the premise of insisting on high hardness and high wear resistance; reducing internal stress and brittleness; avoiding cracking or premature failure during use. Hardness HRC: 58~~64.
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