A carbonitriding bearing part, its preparation method, and a ball bearing having the part
A carbonitriding, parts technology, applied in the direction of manufacturing tools, heat treatment equipment, furnace types, etc., can solve problems such as short service life, and achieve the effects of long service life, improved bearing life, and high contact fatigue strength
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[0037] A method for preparing the above-mentioned carbonitriding bearing parts, the preparation method includes the following steps in sequence:
[0038] ①Carbonitriding: Place the high-carbon chromium steel parts in a heat treatment furnace, heat them to 820-840°C and keep them warm for 2-4 hours.
[0039] hours to carry out carbonitriding, wherein, the atmosphere in the heat treatment furnace and its volume ratio are: RX endothermic gas 93.7% ~ 97.2%, enriched gas 1.3% ~ 1.8%, ammonia 1.5% ~ 4.5%, rich The gas is propane or butane;
[0040] ② Quenching: Quenching the parts after carbonitriding at 820-840°C, and the quenching medium is 60-120°C
[0041] Quenching oil, the cooling time is 2 to 10 minutes;
[0042] ③ Tempering: First heat the quenched parts to 200-220°C and keep them warm for 1-4 hours, then air-cool them to obtain
[0043] to bearing parts.
[0044] A ball bearing, comprising an outer ring 1, an inner ring 2, and steel balls 3, at least one of the outer ri...
Embodiment 1
[0062] A carbonitriding bearing part, the effective hardened layer depth of the bearing part is 0.5mm, and the concentration of C and N elements at a depth of 0.15mm from the surface of the bearing part is: C 1.5%, N 0.2%, C+ N 1.7%, the hardness at a depth of 0.1mm from the surface of the bearing part is 65HRC, the hardness at a depth of 2mm from the surface of the bearing part is 63HRC, and the content of retained austenite at a depth of 0.05mm from the surface of the bearing part is 38%, the content of retained austenite at a depth of 2 mm from the surface of the bearing part is 10%, and the particle size of carbonitrides in the bearing part is not greater than 8 μm, wherein the effective hardened layer depth is measured by the following method :
[0063] First, temper the bearing part at 500°C for 1 hour, and then detect the vertical distance from the surface of the bearing part to the Vickers hardness of 500HV at the core.
[0064] A preparation method of carbonitriding ...
Embodiment 2
[0073] A carbonitriding bearing part, the effective hardened layer depth of the bearing part is 0.36mm, and the concentration of C and N elements at a depth of 0.15mm from the surface of the bearing part is: C 1.5%, N 0.1%, C+ N 1.6%, the hardness at a depth of 0.1mm from the surface of the bearing part is 60HRC, the hardness at a depth of 2mm from the surface of the bearing part is 58HRC, and the content of retained austenite at a depth of 0.05mm from the surface of the bearing part is 17%, the retained austenite content 2mm deep from the surface of the bearing part is 5%, the carbonitride particle size in the bearing part is less than 3 μm, and the effective hardened layer depth is measured by the following method:
[0074] The bearing part is tempered at 490°C for 1 hour, and then the vertical distance from the surface of the bearing part to the center with a Vickers hardness of 500HV is detected.
[0075] A preparation method of carbonitriding bearing parts, the preparatio...
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