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A kind of waste bearing steel grade preservation and reuse method

A technology for bearing steel and waste, which is applied in the field of grade maintenance and reuse of waste bearing steel, can solve the problems of unrealized utilization of all waste bearings, failure to realize the regeneration of all waste bearings, low production efficiency, etc., to reduce the burden of smelting and refining, The blowing time is short and the effect of improving production efficiency

Active Publication Date: 2017-03-15
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Compared with forged bearings, the production process is relatively simple and the process is shorter, but the production efficiency is low, and the regeneration of all waste bearing steel has not been achieved.
[0005] It can be seen that none of the existing patented technologies for recycling used bearings has achieved the level-keeping utilization of all used bearing steel, and some recycling technologies still have safety risks.

Method used

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  • A kind of waste bearing steel grade preservation and reuse method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Put the waste bearing steel into the vibrating trough, and pass through the dust-removed electric furnace flue gas for 30 minutes to obtain the pretreated waste bearing steel. The temperature is 200°C, the water content is 0.001wt%, and the impurity content is 0.01wt%. ; Send the pretreated waste bearing steel into the electric furnace, add 5 wt% anthracite, heat up to 1500°C for melting, blow oxygen for 5 minutes, the maximum content of single impurity elements in molten steel is 0.02wt%, and the total impurity content is 0.06wt% Then add recarburizer to the molten steel, adjust the carbon content of the molten steel to the target bearing steel composition range, and tap out the steel; in the refining furnace, add the alloy material to the molten steel, so that the alloy element composition in the molten steel reaches the target bearing steel requirements; The molten steel after composition adjustment was sent to a special equipment for deep deoxidation for 15 minutes, ...

Embodiment 2

[0019] Put the waste bearing steel into the vibrating trough, and pass through the dust-removed electric furnace flue gas for 60 minutes to obtain the pretreated waste bearing steel. The temperature is 400°C, the water content is 0.0008wt%, and the impurity content is 0.004wt%. ; Send the pretreated waste bearing steel into the electric furnace, add 10 wt% anthracite, heat up to 1650°C for melting, blow oxygen for 15 minutes, the highest single impurity element content in molten steel is 0.01wt%, and the total impurity content is 0.04wt% Then add recarburizer to the molten steel, adjust the carbon content of the molten steel to the target bearing steel composition range, and tap out the steel; in the refining furnace, add the alloy material to the molten steel, so that the alloy element composition in the molten steel reaches the target bearing steel requirements; The molten steel after composition adjustment was sent to a special equipment for deep deoxidation for 25 minutes, ...

Embodiment 3

[0021] Put the waste bearing steel into the vibrating trough, and pass through the dust-removed electric furnace flue gas for 40 minutes to obtain the pretreated waste bearing steel. The temperature is 350°C, the water content is 0.0007wt%, and the impurity content is 0.003wt%. ; Send the pretreated waste bearing steel into the electric furnace, add 6wt% anthracite, heat up to 1550°C for melting, and blow oxygen for 10 minutes. The maximum content of single impurity elements in molten steel is 0.008wt%, and the total impurity content is 0.02wt%; Then add recarburizer to the molten steel, adjust the carbon content of the molten steel to the target bearing steel composition range, and then tap the steel; in the refining furnace, add alloy materials to the molten steel to make the alloy element composition in the molten steel meet the requirements of the target bearing steel; The molten steel after composition adjustment was sent to the special equipment for deep deoxidation for 2...

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Abstract

The invention provides a waste bearing steel relegation reuse method, belongs to the technical field of cyclic economy, and in particular to the waste bearing steel relegation reuse technology. Waste bearing steel serves as a raw material, a full-waste-steel electric furnace smelting method is adopted, through the procedures of pre-treatment, smelting, carbon control, constituent adjustment and control, deoxidization and casting, bearing steel is obtained, and therefore short-process low-cost relegation reuse of the waste bearing steel is achieved. The method has the beneficial effects of being capable of saving energy, environmentally friendly, capable of facilitating industrial production and remarkable in economic benefit, environmental benefit and social benefit.

Description

technical field [0001] The invention provides a method for maintaining grade and reusing waste bearing steel, including pretreatment of waste bearing steel, smelting, carbon control, component regulation, deoxidation and casting processes, belonging to the field of circular economy and environment, and in particular to a method for maintaining grade and reusing waste bearing steel . Background technique [0002] Bearing steel is the joint of machinery and is widely used in industries such as automobiles, aerospace, machine tools, and wind power. According to the forecast of the National Bureau of Statistics in 2014, in 2015, my country's bearing output will exceed 28 billion sets, becoming the world's largest bearing production and sales base. [0003] Bearings are vulnerable parts. In recent years, the annual output of waste bearings in my country has exceeded 3 billion pairs, with a total weight of over 400,000 tons. Therefore, the recycling and grade-keeping regenerati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/52C21C7/06C21C7/00
CPCY02P10/20
Inventor 张深根潘德安杨健刘波刘赓
Owner UNIV OF SCI & TECH BEIJING
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