Round steel used for bearings and a preparing method thereof

Abstract

Round steel used for bearings is provided. The round steel comprises 3.5-4.5 parts of carbon, 8-10 parts of silicon dioxide, 1.1-1.7 parts of niobium, 0.7-1.1 parts of manganese, 3.8-4.8 parts of copper aluminum alloy powder, 0.45-0.65 part of phosphorus, 0.14-0.2 part of sulfur, 3.5-5.5 parts of high ferrochrome, 1.3-2.5 parts of nickel, 1.2-1.9 parts of titanium, 0.25-0.45 part of magnesium and 5-10 parts of waste steel, with the balance being ferric oxide. The round steel used for bearings and a preparing method are provided. The round steel has high strength and hardness, good wear resistance and good smelting effects when the round steel is used for manufacturing bearings, makes the bearing using efficiency higher and bearing rotation smoother, reduces secondary oxidation in a continuous casting process and allows steel inclusion to fully float and be absorbed.

Description

technical field [0001] The invention relates to the technical field of preparation of round steel for bearings, in particular to a round steel for bearings and a preparation method thereof. Background technique [0002] Bearing round steel is a steel type used to manufacture balls, rollers and sleeves of rolling bearings. It belongs to high-quality special steel and can also be used to make precision measuring tools, cold dies, machine tool screws and precision coupling parts of diesel engine oil pumps. In addition to making balls, bearing rings, etc., bearing round steel is sometimes used to make tools, such as dies, measuring tools, taps, etc. [0003] At present, the bearing needs to bear great pressure and friction when it is working, so the bearing round steel is required to have higher hardness and wear resistance, as well as a high elastic limit, and more stringent requirements are required on the manufacturing method. Although some bearings made of bearing round ste...

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Problems solved by technology

[0003] At present, the bearing needs to bear great pressure and friction when it is working, so the bearing round steel is required to have higher hardness and wear resistance, as well as a high elastic limit, and more stringent requirements are required on the manufacturing method. Although some bearings made of bearing round steel can play the role of compressive resistance and wear resistance, the time of compressive resistance and wear resistance is short. After long-term use, the outer shaft of the bearing will be deformed, and the inner shaft of the bearing will pass through The increase in the rolling times of the balls will make the inner shaft thinner and reduce the service life of the bearing. The bearing needs to be replaced frequently, and there are large defects in the method used to prepare the bearing round steel, which affects the effect of smelting, and continuous casting During the process, secondary oxidation will occur, resulting in the low quality of the produced bearing round steel