Bearing steel casting and heat treatment process

Source: China Bearing Network Time: 2018-01-25

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The full name of bearing steel is called rolling bearing steel; it has high compressive strength and fatigue limit; high hardness; high wear resistance and certain resistance; good hardenability; extremely strict control of sulfur and phosphorus; it is a high-grade high-quality steel; Can be used as a cold work tool steel. Specific gravity: 7.81.
(A) bearing steel casting temperature (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; should prevent 200-400 degree blue brittle area. During hot processing; should prevent entry into high temperature brittle area (greater than 1250). It should be prevented from entering hot fragile area (800~~950 degrees).
(2) Post-forging heat treatment (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
GCr6 800~820 water or oil 150~170 62~64
GCr9 800~830 water or oil 150~170 62~64
GCr9SiMn 810~820 water or oil 150~160 62~64
GCr15 820~846 oil 150~160 62~64
GCr15SiMn 800~840 oil 150~170 62~64
(3) Quenching and quenching medium (1) Quenching 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.
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 to carbon steel. Oil temperature: 60~~80 degrees; the highest does not exceed 100~120 degrees.
(4) Tempering temperature The bearing steel is selected for 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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