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Coating for large cast steel roll and preparation method thereof

A technology for cast steel rolls and coatings, which is applied to casting molding equipment, coatings, molds, etc., can solve the problems of high cost of zircon powder coating and sand sticking on the surface of cast steel rolls, and improve the surface quality and inner quality of the rolls. , low price, the effect of reducing production cost

Active Publication Date: 2015-12-30
成都三强轧辊股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a coating for large-scale cast steel rolls and its preparation method, which solves the problem of sand sticking on the surface of cast steel rolls, and the cost of using zircon powder coatings is too high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0012] In the preparation method of the coating, the acid-washed quartz powder, clay, and bentonite are weighed according to the above-mentioned ratio, and then put into the coating mixer for dry mixing for 1 to 2 minutes, and then mixed with water for 20 hours, and then brown sugar and preservative are added. The material is discharged for 4 hours, and finally it is made into a paste.

[0013] The application method of the coating is to use a knife to scrape the paste coating on the surface of the molding sand, or to dilute the paste coating with water and brush it on the surface of the molding sand.

Embodiment 1

[0015] After using this coating, the casting mold is cast with rolls of φ1200×2800 and made of 65CrNiMo, the weight of molten metal is 43t, the pouring temperature is 1492℃, the bottom pouring and pouring speed are 15 tons per minute. The casting conditions are as follows:

[0016] Adopting tangential internal gate rotary pouring technology, adopting φ100 internal gate and φ130 straight gate, adopting a pouring cup with a water volume of 3 tons in the pouring cup holder. After pouring, the inside of the mold is kept warm for 130 hours and then the box is opened. The surface of the roll is smooth and clean. After processing and testing, it meets the acceptance criteria.

Embodiment 2

[0018] The casting specification is φ1260×1310, the material is 45Cr4NiMoV roll, the pouring liquid weight is 28t, the pouring temperature is 1490℃, the pouring speed is 15 tons per minute, and the mold is kept warm for 135 hours before opening the box. The surface of the roll is smooth and clean.

[0019] The coating has now produced tens of thousands of tons of cast steel rolls with a roll body diameter of φ400~φ1450 and a casting weight of 3 to 55 tons. It has achieved good surface quality, greatly reduced production costs, and achieved good economic benefits.

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PUM

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Abstract

The invention discloses a coating for a large-sized cast steel roll. The coating comprises the following components in parts by weight: 100 parts of pickling quartz powder, 1-2 parts of clay, 1-2 parts of bentonite, 1.5-2.5 parts of brown sugar, 15-25 parts of water and 0.1-0.2 part of preservative agents. The preparation method of the coating comprises the following steps of: weighing the pickling quartz powder, the clay and the bentonite according to the proportion, then placing into a coating mixing mill, carrying out dry mixing for 1-2 minutes; then adding water, milling for 20 hours, then adding the brown sugar and the preservative agents, milling for 4 hours, and discharging for standby application; finally preparing into paste. The coating disclosed by the invention can prevent the cast steel roll from generating adhering sand, can be used for reinforcing the sand mould and can prevent the coating layer from forming an impurity by being desquamated and floated in molten metal due to the erosion of a casting mould surface, thereby enhancing the surface quality and inner quality of the cast steel roll. Compared with a zircon sand coating, the coating disclosed by the invention is low in cost, thereby greatly reducing the production cost.

Description

Technical field [0001] The present invention relates to a coating and a preparation method thereof, in particular to a coating for large cast steel rollers and a preparation method thereof. Background technique [0002] As we all know, the use of casting coatings is the most feasible and effective way to improve the surface quality of castings. To achieve excellent results, the quality of casting coatings must first be ensured. Regarding the anti-sand adhesion mechanism of coatings, in the past, too much emphasis has been placed on the ability of the coating layer to prevent metal from penetrating into the pores of the casting mold and inhibiting the chemical reaction at the interface between the molten metal and the casting mold. Taking the high inertness of refractory aggregates at the pouring temperature as the guiding ideology, it is believed that refractory aggregates The refractory resistance of the material is the decisive factor in the anti-sand adhesion effect of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C3/00
Inventor 付家双杨德明漆瑞鸿李元成
Owner 成都三强轧辊股份有限公司