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Friction lubrication performance evaluation method for casting powder of continuous casting mold

A continuous casting crystallizer and lubrication performance technology, applied in the direction of instruments, measuring devices, mechanical devices, etc., to achieve the effect of optimizing performance and improving the quality of casting slabs

Inactive Publication Date: 2017-06-20
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] At present, there are many literatures on the properties of continuous casting mold flux, mainly melting, heat transfer, crystallinity, and alkalinity, viscosity and interfacial tension. There is no literature on the fracture strength of mold flux

Method used

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  • Friction lubrication performance evaluation method for casting powder of continuous casting mold
  • Friction lubrication performance evaluation method for casting powder of continuous casting mold
  • Friction lubrication performance evaluation method for casting powder of continuous casting mold

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0074] The tensile fracture strength of continuous casting mold flux was tested in the following manner.

[0075] 1) First heat the mold slag for the continuous casting mold at 600-700°C for 30 minutes to remove the carbon in it, then cool it down to room temperature naturally to obtain the decarbonized mold slag; crush the decarbonized mold slag and pass through a 40-mesh sieve, Take the undersize and dry it in a vacuum oven at 60°C to constant weight to obtain the decarbonized mold slag powder.

[0076] 2) Put the carbon-removing mold slag powder into the cavity of the graphite tank (the cavity size is 80mm×10mm×30mm), then place it at 1200°C for 20 minutes, and take it out after air cooling to room temperature to obtain a cuboid mold slag block.

[0077] 3) The two ends of the mold slag block are respectively bonded to the plane of one carabiner with AB glue, and the lock ring is connected with the lock ring of the other carabiner. Then fix the two outer carabiners on the...

specific Embodiment 2

[0080] The compressive fracture strength of the continuous casting mold powder was tested in the following way.

[0081] 1) First heat the mold slag for the continuous casting mold at 600-700°C for 30 minutes to remove the carbon in it, then cool it down to room temperature naturally to obtain the decarbonized mold slag; crush the decarbonized mold slag and pass through a 40-mesh sieve, Take the undersize and dry it in a vacuum oven at 60°C to constant weight to obtain the decarbonized mold slag powder.

[0082] 2) Put the carbon-removing mold slag powder into the cavity of the graphite tank (the cavity size is 80mm×10mm×30mm), then place it at 1200°C for 20 minutes, and take it out after air cooling to room temperature to obtain a cuboid mold slag block.

[0083]3) The two ends of the mold slag block are respectively bonded to the plane of one carabiner with AB glue, and the lock ring is connected with the lock ring of the other carabiner. Then fix the two outer carabiners ...

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Abstract

The invention discloses a friction lubrication performance evaluation method for casting powder of a continuous casting mold. The method comprises the following steps: acquiring the temperature of each surface region of an ingot blank in a withdrawing process, thermal contact resistance between each surface region and a corresponding casting powder interface and the thermal liquid powder resistance of the casting powder; calculating the shear stress of solid powder and liquid powder interfaces of the casting powder according to the acquired temperature of each surface region, the thermal contact resistance between each surface region and the corresponding casting powder interface and the thermal liquid powder resistance of the casting powder, thereby obtaining the shear stress of the solid powder and liquid powder interface corresponding to each surface region; acquiring the breaking strength of the casting powder; comparing the shear stress corresponding to each surface region with the breaking strength of the casting powder; if the shear stress corresponding to a certain surface region is lower than the breaking strength of the casting powder, calculating the friction stress of the surface region of the ingot blank according to a formula (1); if the shear stress corresponding to a certain surface region is more than or equal to the breaking strength of the casting powder, calculating the friction stress of the surface region of the ingot blank according to a formula (3).

Description

technical field [0001] The invention belongs to the technical field of material performance detection, and in particular relates to a method for evaluating the friction and lubrication performance of mold slag in continuous casting crystallizers. Background technique [0002] Mold powder has the functions of lubrication, heat transfer, heat preservation, oxidation prevention and inclusion absorption in the continuous casting process. Among them, the lubrication and friction of mold slag between the copper plate of the mold and the solidified slab shell has an important impact on the continuous casting production and the quality of the slab. Bonded steel breakouts account for the largest proportion of various steel breakout accidents with serious consequences, accounting for about 10% of the total number of steel breakout accidents. And it is mainly caused by poor lubrication of mold slag. In addition, the frictional stress may also have some influence on the cracks on the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N19/02
CPCG01N19/02
Inventor 陈登福谢鑫俞晟龙木军段华美吕奎
Owner CHONGQING UNIV
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