Low-temperature prewarming and flattening method of normalizing furnace

A technology of normalizing furnace and preheating and pressing, which is applied in the direction of furnace, furnace type, heat treatment furnace, etc., can solve the problems of increasing the transportation and transfer of the intermediate process of steel plate, failing to meet the requirements of technical conditions, and damaging the company's image and reputation, etc., to simplify production process, reduce the generation of unplanned quantities, and shorten the production cycle

Inactive Publication Date: 2010-11-17
WUYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In recent years, the amount of unplanned steel rolling mills has remained high, mainly due to the bending of the steel plate shape. Some of the high-strength steel controlled rolling cannot be straightened at high temperature in the normalizing furnace, and can only be unplanned according to the bending. Warehousing, resulting in a large number of unplanned, because its performance changed after the high-temperature straightening at 730-900°C in the normalizing furnace, and the yield strength dropped significantly, which could not even meet the technical requirements of the user contrac

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Example Embodiment

[0023] Example 1

[0024] The normalizing furnace low temperature preheating flattening method of the present invention comprises the following steps:

[0025] (1) In this embodiment, the heating temperature of the normalizing furnace of steel based on bainite is 450° C., and the total heating time is 1.2 minutes / mm (this process is applicable to all steels based on bainite);

[0026] (2) When the steel plate is fed into the furnace, the method of slow loading and fast exit is adopted. The furnace loading speed is set at 0.007m / s, and the furnace discharge speed is set at 0.5m / s, so that the steel plate can be straightened after being discharged from the furnace, and the flatness of the steel plate can be guaranteed. Before straightening, blow air to clean the iron sheet and other sundries on the surface of the steel plate, so as to avoid the pressing of the iron sheet of the steel plate and the normalization of pits and roll marks, so as to reduce unplanned occurrences.

Example Embodiment

[0027] Example 2

[0028] The normalizing furnace low temperature preheating flattening method of the present invention comprises the following steps:

[0029] (1) In this embodiment, the heating temperature of the normalizing furnace of steel based on bainite is 500° C., and the total heating time is 1.2 minutes / mm (this process is applicable to all steels based on bainite);

[0030] (2) When the steel plate is fed into the furnace, the method of slow loading and fast exit is adopted. The furnace loading speed is set at 0.125m / s, and the furnace discharge speed is set at 0.5m / s, so that it is easy to straighten the steel plate after it comes out of the furnace, and ensure the flatness of the steel plate. Before straightening, blow air to clean the iron sheet and other sundries on the surface of the steel plate, so as to avoid the pressing of the iron sheet of the steel plate and the normalization of pits and roll marks, so as to reduce unplanned occurrences.

Example Embodiment

[0031] Example 3

[0032] The normalizing furnace low temperature preheating flattening method of the present invention comprises the following steps:

[0033] (1) The heating temperature of the normalizing furnace for ferrite-based steel is 600°C, and the total heating time is 1.2 minutes / mm (this process is applicable to all ferrite-based steels);

[0034] (2) When the steel plate is fed into the furnace, the method of slow loading and fast exit is adopted. The furnace loading speed is set at 0.007m / s, and the furnace discharge speed is set at 0.5m / s, so that the steel plate can be straightened after being discharged from the furnace, and the flatness of the steel plate can be guaranteed. Before straightening, blow air to clean the iron sheet and other sundries on the surface of the steel plate, so as to avoid the pressing of the iron sheet of the steel plate and the normalization of pits and roll marks, so as to reduce unplanned occurrences.

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Abstract

The invention discloses a low-temperature preheating flattening method for a normalizing furnace, which comprises the following steps: firstly, the heating temperature of the normalizing furnace of steel is between 450 and 650 DEG C, and the total heating time is 1.2 minutes per millimeter; and secondly, when a steel plate enters the furnace, a slow-charging and quick-discharging method is adopted, wherein the charging speed is between 0.007 and 0.125 meter per second, and the discharging speed is between 0.1 and 0.5 meter per second; and impurities such as sheet iron on the surface of the steel plate are blown to be clean by blowing before straightening. The method can eliminate partial internal stress of the steel by adoption of lower heating temperature, so as to be favorable for straightening the steel plate. Moreover, because the heating temperature is lower, the temperature of the steel plate is lower after straightening and the possibility of generating re-buckling due to nonuniform cooling when the steel plate is conveyed and cooled is greatly reduced, thereby the straightening effect of the method on thin and wide plates can be better. Simultaneously, the lower heating temperature is very important to reduce the energy consumption. The method meets the technical condition requirements of a user contract, and creates great benefit when simultaneously reducing unscheduled investment of factories.

Description

technical field [0001] The invention relates to a low-temperature preheating and flattening method of a normalizing furnace, which is applied to the buckling of high-strength steel plates after being straightened in a normalizing furnace. Background technique [0002] In recent years, the amount of unplanned steel rolling mills has remained high, mainly due to the bending of the steel plate shape. Some of the high-strength steel controlled rolling cannot be straightened at high temperature in the normalizing furnace, and can only be unplanned according to the bending. Warehousing, resulting in a large number of unplanned, because its performance changed after the high-temperature straightening at 730-900°C in the normalizing furnace, and the yield strength dropped significantly, which could not even meet the technical requirements of the user contract, and straightened after normalizing The surface quality of the steel plate is deteriorated by advanced technology, and the su...

Claims

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Application Information

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IPC IPC(8): C21D9/46B21D1/00
CPCY02P10/20
Inventor 赵全卿宋向前邓东升李欢欢吴天育邹俊宁康康罗君高陈俊奇何广霞任军奎齐燕
Owner WUYANG IRON & STEEL
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