Steel coil preheating method capable of preventing rusting

A steel coil and preheating temperature technology, applied in heat treatment baths, heat treatment furnaces, heat treatment equipment, etc., can solve the problems of high cost of oil bath preheating method, steel coil corrosion, large investment, etc., to achieve low cost, prevent steel The effect of coil corrosion and investment saving

Active Publication Date: 2010-09-22
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above methods have their own advantages and disadvantages: the oil bath type preheating method is costly and unsafe; although the water bath type is low in cost, it is easy to produce steel coil corrosion; induction type, bell type furnace type (hot air), tunnel furnace type (hot air ) and other preheating methods require a large investment

Method used

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  • Steel coil preheating method capable of preventing rusting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Before rolling, a steel coil with a diameter of 1000 mm and a weight of 9.256 tons is preheated. Place the steel coil in the steel coil saddle 4 of the preheating tank 1, inject 1.5% emulsion from the valve 2 through the pipeline 3, and prepare the emulsion using the same rolling oil stock solution as the emulsion used for rolling in the cold rolling mill. Then feed steam to heat the emulsion so that the temperature of the emulsion reaches 90°C, and preheat the steel coil, and the preheating time is 93 minutes. After preheating, the coil temperature reaches 90°C. The time from the completion of preheating to the start of rolling is 13 minutes without rust.

Embodiment 2

[0019] The weight of the steel coil to be preheated is 12.899 tons, the concentration of the injected emulsion is 12.0%, the temperature of the emulsion is 91°C, the preheating time of the steel coil is 127 minutes, and the temperature of the steel coil after preheating is 91°C. The time from the completion of preheating to the start of rolling was 110 minutes without rusting. Others are the same as embodiment 1.

Embodiment 3

[0021] The weight of the steel coil to be preheated is 19.226 tons, the concentration of the injected emulsion is 7.7%, the temperature of the emulsion is 93°C, the preheating time of the steel coil is 182 minutes, and the temperature of the steel coil after preheating is 93°C. The time from the completion of preheating to the start of rolling is 28 minutes without rust. Others are the same as embodiment 1.

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Abstract

The invention provides a steel coil preheating method capable of preventing rusting, which comprises the step of: placing a steel coil into a preheating tank, injecting 1 to 20 percent emulsion and introducing vapor to heat the emulsion to preheat the steel coil at the temperature of 70 to 95 DEG C for 90 to 240 minutes, preferably for 90 to 180 minutes. The method has the advantages of low cost, convenient operation, high preheating speed and the capacity of effectively preventing the steel coil from being rusted.

Description

technical field [0001] The invention relates to the field of material processing, in particular to a method for preheating steel coils before cold rolling of steel. Background technique [0002] Before cold rolling, it is often necessary to preheat the steel coil. For example, when producing high-grade silicon steel, preheating is required to increase the plasticity of rolled raw steel coils and enhance the processing performance of hot-rolled steel coils. How to preheat the steel coil and what medium to use to preheat the steel coil can not only realize the rapid preheating of the steel coil, but also prevent the corrosion of the steel coil, which are the subjects that various manufacturers have been studying. [0003] Coil preheating methods are used in different ways in steel mills around the world. The usual methods are oil bath type, water bath type, induction type, bell furnace type (hot air), tunnel furnace type (hot air) and so on. The above methods have their own...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/44C21D9/52
Inventor 杨华国朱简如沈明华游学昌
Owner BAOSHAN IRON & STEEL CO LTD
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