Steel smelting process used for automobile hub bearing

A technology for smelting automobile wheels and steel, which is applied in the field of metallurgy, can solve the problems of low production efficiency of die casting process, increase material production cost, affect the purity of molten steel, etc., reduce the content of non-metallic inclusions, reduce the chance of oxidation slag, The effect of reducing the chance of absorbing N

Active Publication Date: 2016-04-06
ZENITH STEEL GROUP CORP
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Problems solved by technology

[0004] At present, the domestic carbon bearing steel for automobile wheel bearings is basically produced by "electric furnace + refining outside the furnace + die casting or electroslag ...

Method used

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  • Steel smelting process used for automobile hub bearing

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Embodiment Construction

[0034] A kind of steel for automobile hub bearings, which is produced by the process route of "converter smelting → LF furnace refining → RH vacuum furnace treatment → continuous casting machine pouring". The purity control method of the molten steel is as follows:

[0035] Converter process

[0036] 1. The loading capacity of a converter with a nominal volume of 120t is 133.8t, including 117.5t of molten iron, 16.3t of scrap steel, 0.53% carbon content at the end of the converter, tapping temperature of 1647°C, and tapping volume of 120.6t.

[0037] 2. Add 100kg of aluminum cake, 100kg of low-nitrogen recarburizer, corresponding amount of ferroalloy, 700kg of low-Ti pre-melted refining slag, and 500kg of lime during the tapping process of the converter.

[0038] LF refining furnace process

[0039]1. In the early stage, SiC100Kg / furnace and aluminum particles 50Kg / furnace are used for diffusion deoxidation of slag. In the early stage, large argon gas flow is used, and th...

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Abstract

The invention belongs to the field of metallurgy, and relates to a steel smelting process, in particular to a steel smelting process used for an automobile hub bearing. The steel smelting process comprises the steps that 1, high-quality molten iron and scrap steel are added into a converter, tapping is conducted through a sliding plate, remaining steel operation is adopted, and deoxidizing is conducted on molten steel through different numbers of Al cakes according to the C content at the end; 2, aluminum is used in advance in the refining process, white slag is controlled to be kept for more than 30 min, and maintaining of deoxidization and the liquidity of the slag is reinforced in the whole refining process; 3, enough vacuum deairing time is ensured in the RH process, and the soft blowing time is ensured; and 4, double slag is adopted for covering a continuous casting tundish, so that impurities in the molten steel are adsorbed, and meanwhile secondary oxidation is prevented. According to the steel smelting process used for the automobile hub bearing, the purity of the molten steel is improved to the greatest extent, the oxygen content of a produced bearing steel for a hub reaches 5.2 ppm, the titanium content of the molten steel is 10 ppm, rating of non-metallic impurities reaches the best international level, the fatigue life of the bearing steel for the hub is prolonged, sequence continuous casting of the molten steel is achieved, and the production cost is reduced.

Description

technical field [0001] The invention belongs to the field of metallurgy and relates to a steel smelting process, in particular to a steel smelting process for automobile hub bearings. Background technique [0002] The car hub bearing unit mainly bears the weight of the car (radial load) transmitted through the suspension system, the axial load generated by the steering of the car, transmits the torque from the gearbox and the drive shaft, and makes the car move forward and backward, so it is a very Important safety piece. At present, carbon bearing steel is mainly used to produce automobile wheel bearings. The main steel types are G55Mn and G70Mn of the national standard, which are equivalent to the SAE1055M and SAE1070M grades of the American standard. In order to meet its use requirements, the bearing steel for automobile hub must have good fatigue life, cutting performance and uniform macrostructure. [0003] The quality of high-quality bearing steel for automobile whee...

Claims

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Application Information

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IPC IPC(8): C21C5/28C21C7/06C21C7/064C21C7/10C22C33/04B22D11/18
CPCB22D11/18C21C5/28C21C7/06C21C7/064C21C7/10C22C33/04Y02P10/20
Inventor 邓向阳沈艳杜佳美刘宪民
Owner ZENITH STEEL GROUP CORP
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