High-end bearing steel material for machine tool and production process thereof

A production process and bearing steel technology, applied in the field of high-end bearing steel materials and production processes for machine tools, can solve the problems of wear resistance and contact fatigue strength that cannot meet the requirements of high-end CNC machine tools, and achieve uniform carbide distribution and carbonization. The effect of improving the material level and high purity

Active Publication Date: 2019-09-20
建龙北满特殊钢有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that the wear resistance and contact fatigue strength of existing bearing steel materials cannot meet the requirements of high-end CNC machine tools, the invention provides a high-end bearing steel material for machine tools and its production process

Method used

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  • High-end bearing steel material for machine tool and production process thereof
  • High-end bearing steel material for machine tool and production process thereof
  • High-end bearing steel material for machine tool and production process thereof

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Experimental program
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Effect test

Embodiment 1

[0050] This embodiment provides a high-end bearing steel material for machine tools, the chemical components contained in it include C: 0.95-1.05%, Si: 0.15-0.35%, Mn: 0.25-0.45%, Cr: 1.45- 1.60%, Ni: 0.05~0.10%, Mo: 0.02~0.06%, Al: 0.010~0.050%, Cu: 0.06~0.10%, P≤0.010%, S≤0.008%, Nb: 0.010~0.045%, Y≤ 0.020%, Ce≤0.010%, Ti≤0.0015%, O≤0.0020%, As≤0.040%, Sn≤0.030%, Sb≤0.0050%, Pb≤0.0020%, Ca≤0.0010%, the rest is Fe and unavoidable impurities .

[0051] Carbon is an important element that affects the performance of steel, and is one of the important elements to ensure that bearing steel can have sufficient hardenability, hardness and wear resistance. The carbon strengthening effect is very high, the carbon content in the steel increases, the yield point and tensile strength increase, but the toughness is significantly reduced. In order to improve the safety and reliability of the bearing steel, while increasing the carbon, through alloying Improve the strength, that is, from ...

Embodiment 2

[0060] This embodiment provides a production process of high-end bearing steel materials for machine tools. The production process includes electric furnace → LF refining and VD process → die casting → hot delivery / cover cooling → primary heating and rolling blanking → slow cooling → two Secondary heating and rolling → spheroidizing annealing;

[0061] In the electric furnace process:

[0062] Put pig iron, molten iron or steel material into the electric furnace, when the temperature of the molten steel is ≥1580°C and the C content is ≥0.30%, the generated oxidized slag is released, and the electric furnace begins to tap steel. New composite slag, aluminum ingot, alloy and lime;

[0063] In the LF refining and VD process:

[0064] After the molten steel reaches the refining position, the temperature is raised to 1550°C, and ferrosilicon and new composite slag are added to form slag. After the slag is melted, diffusion deoxidizer is added in batches for slagging. When the sla...

Embodiment 3

[0074] The difference between this embodiment and Embodiment 2 is only that in the electric furnace process of the production process of high-end bearing steel materials for machine tools in this embodiment:

[0075]Put pig iron, molten iron or iron and steel materials into the electric furnace according to the weight ratio of 4:6, and the iron and steel materials use non-Ti-containing steel grade materials; when the molten steel temperature is ≥ 1580 °C and the C content is ≥ 0.30%, the oxidation slag is released, and start Electric furnace tapping, the amount of steel remaining in the electric furnace is more than 7 tons during the tapping process, to prevent the oxidation slag from being carried out during the tapping process, if the oxidation slag is brought in during the tapping process, the FeO, P in the oxidation slag 2 o 5 、TiO 2 It will be reduced to P and Ti during the refining process, resulting in the return of phosphorus and titanium in the molten steel, so it mu...

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Abstract

The invention relates to a high-end bearing steel material for a machine tool and a production process of the high-end bearing steel material, and belongs to the technical field of special steel smelting. The high-end bearing steel material for the machine tool and the production process of the high-end bearing steel material aim to solve the problem that the properties such as wear resistance and contact fatigue strength of an existing bearing steel material cannot meet the requirements of a high-end numerical control machine tool, and the production process comprises electric furnace treatment, LF refining and VD process, die casting, hot delivery/cover cooling, primary heating rolling cogging, slow cooling, secondary heating rolling and spheroidizing annealing. Ni, Mo and rare earth elements are added on the basis of existing bearing steel, the content of Al and Cu is strictly controlled, and a good mechanical property index is provided for steel materials, and the produced bearing steel material has high elasticity limit, tensile strength, contact fatigue strength and wear resistance, can effectively reduce the phenomena of material fatigue flaking, clamping and the like and is applicable to manufacturing a bearing ring and a rolling body and needle with the wide size range for the machine tool.

Description

technical field [0001] The invention belongs to the technical field of special steel smelting, and in particular relates to a high-end bearing steel material for machine tools and a production process thereof. Background technique [0002] With the rapid development of numerical control technology, the technology of machine tool industry is also developing rapidly. Among them, high-speed machining can effectively improve the machining efficiency of machine tools and shorten the machining cycle of workpieces. This requires the machine tool spindle and its related components to meet the needs of high-speed machining. At present, the spindle bearings of CNC machine tools are basically limited to four structural types: angular contact ball bearings, cylindrical roller bearings, two-way thrust angular contact ball bearings and tapered roller bearings. [0003] Bearing steel material is a special steel type used to manufacture balls, rollers and sleeves of rolling bearings. Bear...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/06C22C38/42C22C38/48C21D8/00C21C5/52C21C7/06C21C7/10C21D1/32
CPCC21C5/52C21C7/06C21C7/10C21D1/32C21D8/005C21D2211/005C21D2211/009C22C38/005C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/48Y02P10/20
Inventor 熊洪进陈列董贵文李彬王强马忠存陈迦杉杨平
Owner 建龙北满特殊钢有限责任公司
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