Heat treatment method for bearing steel
A heat treatment method and bearing steel technology, applied in heat treatment furnaces, heat treatment equipment, furnaces, etc., can solve the problems of difficult to meet the requirements of oil drilling and large mines, reduced use stability and effect, poor impact resistance and high temperature stability, etc. problem, to achieve the effect of facilitating realization, good use effect and enhancing surface fatigue strength
Pending Publication Date: 2021-05-28
C&U CO LTD +1
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Problems solved by technology
High-carbon chromium bearing steel represented by GCr15 is difficult to meet the requirements of oil drilling and large-scale mine operations due to its high carbon content and low impact resistance
The current 55SiMoV is the recommended steel used in oil drilling. In JB / T6366 "Technical Conditions for Heat Treatment of Carbon Impact-resistant Bearing Steel Parts for Rolling Bearings", the conventional overall quenching and carburizing heat treatment requirements are stipulated, but because this heat treatment method has high Due to the limitations of bearings, the impact resistance and high temperature stability of the bearing are poor during use, which reduces the stability and effect of use.
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[0016] The first embodiment of the bearing steel heat treatment method of the present invention: comprises the following steps,
[0017] Step 1, normalize, raise the temperature in the furnace to 890°C, put steel, keep it warm for 60 minutes, then oil-cool to 380°C, then drain the oil-cooled steel, and air-cool to room temperature;
[0018] Step 2, spheroidizing annealing, raising the temperature in the furnace to 740°C, placing the steel obtained in step 1, keeping it warm for 3 hours, then furnace cooling to 650°C, and then taking it out of the furnace and air cooling to room temperature;
[0019] Step 3, quenching, put the steel or steel in step 2 in a multi-purpose furnace, the furnace temperature is 890°C, keep it warm for 30 minutes, and then put it into a cooling tank. If the temperature is lower than 50°C, take it out and cool it to room temperature after water cooling;
[0020] Step 4, tempering, tempering the steel obtained in step 3 at 200°C for 1h to 3h;
[0021]...
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The invention discloses a heat treatment method for bearing steel. The heat treatment method comprises the following steps: 1, normalizing: raising the temperature in a furnace to 890-930 DEG C, placing steel in the furnace, carrying out heat preservation for 40-60 min, carrying out oil cooling to 380-410 DEG C, discharging oil and carrying out air cooling to room temperature; 2, spheroidizing annealing: raising the temperature in the furnace to 740-810 DEG C, placing the steel obtained in the step 1 in the furnace, carrying out heat preservation for 3-6 h, carrying out furnace cooling to 650 DEG C, discharging the steel and carrying out air cooling to the room temperature; 3, quenching: placing the steel obtained in the step 2 in a multi-purpose furnace, wherein the furnace temperature ranges from 890 DEG C to 930 DEG C, carrying out heat preservation for 25-55 min, placing the steel in a cooling tank, carrying out isothermal salt bath for 30-50 min at the temperature of 250-300 DEG C, carrying out water cooling, wherein the water cooling temperature is lower than 50 DEG C, taking out the steel and carrying out air cooling to the room temperature after water cooling is completed; 4, tempering: tempering the steel obtained in the step 3 for 1-3 h at the temperature of 200-270 DEG C; and 5, additional tempering: tempering the steel subjected to tempering operation in the step 4 for 6-8 h at the temperature of 180-200 DEG C. According to the heat treatment method, the heat treatment effect is better, and the impact resistance and heat resistance of the bearing steel are improved.
Description
technical field [0001] The invention relates to the technical field of steel heat treatment, in particular to a heat treatment method for bearing steel. Background technique [0002] Under the working conditions of oil drilling and large mining machinery, bearings will withstand greater impact. High-carbon chromium bearing steel represented by GCr15 is difficult to meet the requirements of oil drilling and large-scale mine operations due to its high carbon content and low impact resistance. The current 55SiMoV is the recommended steel used in oil drilling. In JB / T6366 "Technical Conditions for Heat Treatment of Carbon Impact-resistant Bearing Steel Parts for Rolling Bearings", the conventional overall quenching and carburizing heat treatment requirements are stipulated, but because this heat treatment method has high Due to the limitations of bearings, the impact resistance and high temperature stability of the bearing are poor during use, which reduces the stability and ef...
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IPC IPC(8): C21D9/40C21D1/18C21D1/32
CPCC21D9/40C21D1/32C21D1/18
Inventor 牛玉周
Owner C&U CO LTD