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Method for reducing hearth roll mark defect on steel plate surface

A hearth roller and steel plate technology, applied in furnaces, furnace components, furnace types, etc., can solve the problems of increasing the amount of artificial grinding of steel plate surface defects, reducing the qualified rate of steel plate surface, affecting the quality of steel plate surface, etc., to reduce the consumption of spare parts and cost expenditure, reduce indentation defects, and increase unit output

Inactive Publication Date: 2013-01-02
ANGANG STEEL CO LTD
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This defect not only directly affects the appearance of the product, but also seriously affects the surface quality of the steel plate, reducing the surface pass rate of the steel plate
At the same time, it greatly increases the amount of artificial grinding of steel plate surface defects, prolongs the production time and increases the production cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] 1. Before the steel plate enters the heat treatment furnace, the upper and lower surfaces of the steel plate must be shot blasted to ensure that there is no iron oxide residue on the surface of the steel plate, and keep the surface of the steel plate clean and free of any debris, especially to prevent flame cutting slag and hanging strips .

[0015] 2. Grind the furnace roller once a week: Use 3 cold steel plates with a thickness of 100mm to pass through the heat treatment furnace at a speed of 3.5m / min, and then pass in the opposite direction at the same speed, and continue rolling for 25 minutes , by repeatedly rolling the convex hull on the hearth roller to break the convex hull to improve the surface condition of the hearth roller.

[0016] 3. Keep the heat treatment furnace in a micro-oxidizing atmosphere, and control the oxygen content in the furnace to about 400ppm.

[0017] 4. Reasonably arrange the heat treatment production plan, control the continuous quenchi...

Embodiment 2

[0019] 1. Before the steel plate enters the heat treatment furnace, the upper and lower surfaces of the steel plate are subjected to shot blasting treatment, so that there is no iron oxide residue on the surface of the steel plate, and the surface of the steel plate is kept clean without any sundries, especially to eliminate the phenomenon of flame cutting slag and hanging strips.

[0020] 2. Grind the furnace rollers once a week: Use 5 cold steel plates with a thickness of 70mm to pass through the heat treatment furnace at a speed of 6m / min, and then pass in the opposite direction at the same speed, and continue rolling for 30min. Break the convex hull on the hearth roll to improve the surface condition of the hearth roll.

[0021] 3. Keep the heat treatment furnace in a micro-oxidizing atmosphere, and control the oxygen content in the furnace to about 450ppm.

[0022] 4. Reasonably arrange the heat treatment production plan, control the continuous quenching process time, and...

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Abstract

The invention provides a method for reducing hearth roll mark defect on the steel plate surface, which adopts steel plate surface pretreatment, in-furnace atmosphere control and production cycle measurement to effectively suppress the generation of hearth roll nodulation, adopts on-line roll grinding to grind the formed hearth roll nodulation to reduce the hazard extent of the hearth roll nodulation, improves the quality qualified rate of the steel plate from 83.7% to 95%, greatly reduces hearth roll mark defect on the steel plate lower surface, remarkably reduces mass loss, reduces the production cost, and can relatively prolong the service life of the hearth roll, prolong the blowout cycle of the heat treatment furnace and improve the unit yield. The method can also reduce the work load for grinding the defects on the steel plate surface, the labor intensity of grinding workers and spare part consumption and cost.

Description

technical field [0001] The invention belongs to the field of steel plate heat treatment technology, and in particular relates to a method for controlling nodulation of heat treatment furnace rolls and reducing the indentation defect rate of furnace bottom rolls on the surface of steel plates. Background technique [0002] With the development of the economy, the demand for heat treatment products is increasing. At present, many plate manufacturers generally use hearth heat treatment furnaces such as open flame type and non-oxidation type to produce medium and heavy plate. After a period of production and use in the heat treatment furnace, the lower surface of the steel plate is prone to dense pit-like indentation defects. The main reason is that the surface of the hearth roller is adhered by the oxide scale after long-term use, forming a thick convex hull , The strength of the steel plate is greatly reduced at high temperature. Therefore, when passing through the furnace, t...

Claims

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Application Information

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IPC IPC(8): C21D9/00B24C1/00F27D7/06F27D25/00
CPCY02P10/20
Inventor 李新玲王动白明珠于峰曲圣昱乔馨王若钢王明林
Owner ANGANG STEEL CO LTD
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