CN201265027Y

CN201265027Y - Direct switch-on heating annealing apparatus of hot rolled plate

Info

Publication number: CN201265027Y
Application number: CNU2008202181162U
Authority: CN
Inventors: 高振宇; 张智义; 金文旭; 李文权; 冷显国; 张仁波; 李亚东; 罗理; 李元华
Original assignee: Angang Steel Co Ltd
Current assignee: Angang Steel Co Ltd
Priority date: 2008-09-18
Filing date: 2008-09-18
Publication date: 2009-07-01
Anticipated expiration: 2018-09-18

Abstract

The utility model provides a hot-rolling plate directly electrifying heating and annealing device which is a heating device comprising a circuit by two conductive rollers, a power supply and a steel plate and is arranged in the acid-pickling front loop of single unit of silicon steel or pickling rolling combination unit; the current forms a circuit by a leading wire, two upper conductive rollers with a certain distance and a steel plate. As the resistivity of electric steel is large, when the current passes by the steel plate, the electric energy is converted into the heat energy so as to increase the temperature of the steel plate and change the tissue of the steel plate. The hot-rolling plate directly electrifying heating and annealing device can improve the magnetic induction intensity of the product, reduces the iron loss value and achieves the performance requirement of high-efficiency products when being executed in the production of normal products of cold-rolling electric steel, and can replace the normalized unit and realize the production with high efficiency and low cost by the cold-rolling method under one-step great reduction rate when being executed in the production of high-grade cold-rolling electric steel and oriented electrical steel. The hot-rolling plate directly electrifying heating and annealing device has little investment and small land occupying, saves the energy, has low cost and can be arranged flexibly.

Description

The hot-rolled sheet heating anneal device of directly switching on

Technical field

The utility model belongs to the technical field that silicon steel is produced, and relates to making in the high-performance cold rolled electrical sheet process the steel plate heating anneal device of directly switching on.

Background technology

During cold rolling electric was produced, when 〉=2%Si content, when adopting the once cold rolling manufacturing process, hot-rolled sheet must normalizing, and main purpose is that hot-rolled sheet is organized is more even, and recrystal grain is increased, and prevents tile of finished product ridge shape defective; Simultaneously, the precipitate alligatoring that makes crystal grain is handled in normalizing, strengthens (100) and (110) component and weakens (111) component, and magnetic property obviously improves, particularly the magnetic strength value.

Facing to worldwide energy-conservation, lower consumption, economize on resources and the pressing for of environment protection; the electronic product of making iron core with cold rolling electrical steel product is progressively to the development of miniaturization, high precision int and high efficiency; impel conventional products to make the transition to premium quality product, normalizing process is used more and more general.

The main body equipment of implementing normalizing process is the normalizing unit, is equivalent to the continous way annealing unit of hot-rolled sheet coil, and investment is big, occupation of land is many, energy consumption is big, process cost is high.In addition because hot-rolled sheet thickness is thicker, and the silicon steel thermal conductivity is lower, so need just to make steel plate reach technological temperature long heat-up time.Therefore require the normalizing unit that long body of heater is arranged, satisfy the intensification requirement.Normalizing furnace generally adopts electrically heated, and carries out in shielding gas atmosphere, and energy utilization rate is lower.

Avoid the problem of existing electrically heated energy dissipation in order to reach the normalizing purpose, prior art also has corresponding report, and for example the technology wide coverage of alternative normalizing process has: hot rolled coil high temperature batches technology, hot rolled coil bell-type annealing technology etc.

Hot rolled coil high temperature batches and is subjected to the reeling machine capabilities limits, and can not realize high temperature, short time control uniform formation and precipitate form, and even more serious is that invar is rolled up inhomogeneous cooling end to end, causes finished product magnetic inequality.

Hot rolled coil bell-type annealing technology can not be controlled the homogeneity of coil of strip tissue equally, and the high temperature annealing time is long, and hot-rolled sheet crystal grain is excessive, and the cold-workability difference also makes the finished surface quality deteriorated; The high temperature iron sheet also often makes the pickling difficulty, so also do not have a kind of practicable method to solve the problem of utilizing process furnace to finish normalizing at present.

The utility model content

The utility model provides a kind of hot-rolled sheet heating anneal device of directly switching on; adopt directly energising heating anneal device processing cold rolling electric raw material---hot rolled coil; substitute conventional normalizing unit; at high temperature, in short-term, thermal treatment process is issued to that hot-rolled sheet recrystallized structure is perfect fast, uniform crystal particles, precipitate are controlled, the favorable texture component strengthens, and realize purpose energy-conservation, the high-performance cold rolled electrical steel product of high efficiency production.

The purpose of this utility model is achieved in that it forms the heating unit in loop by two conductive rollers and power supply and steel plate, is installed in before and after the single-row unit of silicon steel or before the pickling of the rolling associating unit of pickling in the kink.Electric current is by lead, have certain distance two on conductive rollers, and steel plate constitutes the loop.Because the resistivity of electrical steel is bigger, when electric current passed through steel plate, electric energy converts heat energy to raise steel billet temperature, and the steel plate tissue is changed.

The utility model utilization heating anneal device of directly switching on adopts controlled direct supply or the AC power under the certain frequency, affacts the steel band of operation under the certain speed by conductive rollers, realizes the high temperature, short time rapid heating; Refrigerating unit be can attach subsequently and tissue and precipitate state further controlled.

The utility model is characteristics of utilizing silicon steel resistivity higher, and by big electric current, steel plate self is as electrical heating element, so thermo-efficiency is higher at steel plate.Owing to do not have the heat transfer process of heating unit, so heat-up rate is very fast to silicon steel.Use the alive method heating of steel plate, can be by increasing the method controlled temperature of electric current.Heating temperature is not subjected to effects limit such as heating unit, when electric current is enough big, can make steel plate reach comparatively high temps at short notice, melts until steel plate.Deformed grains recrystallize speed is determined by factors such as Heating temperature, rate of heating, heat-up time and deformation energies, wherein Heating temperature has the greatest impact to recrystallize, improve significantly accelerate recrystallisation process of Heating temperature, so under comparatively high temps, just can finish recrystallize in the short period.

The utility model is implemented in the cold rolling electric conventional products is produced, and can improve product magnetic induction density, reduces core loss value, reaches the high efficiency products performance requriements; Implement in high grade cold rolling electrical steel and oriented electrical steel production, alternative normalizing unit is realized a heavy reduction rate cold-rolling practice high-efficiency and low-cost production.The utility model investment is little, take up an area of less, save the energy, cost is low, places flexibly.

Description of drawings

Accompanying drawing is a structural representation of the present utility model.

Embodiment

Below in conjunction with accompanying drawing specific embodiment of the utility model is elaborated:

As shown in the figure, the utility model constitutes the heating unit that the loop is formed by two conductive rollers 2 and power supply 1 with the steel plate 3 that moves, and steel plate 3 is own as heating unit, and it is installed in the single-row unit or the preceding kink of the rolling associating unit of pickling pickling of silicon steel.Electric current is by lead, have certain distance two on conductive rollers 2, and steel plate 3 constitutes loops.Because the resistivity of electrical steel is bigger, when electric current passed through steel plate, electric energy converts heat energy to raise steel billet temperature, and the steel plate tissue is changed.

The utility model adopts before the pickling in the rolling associating unit of pickling, after utilize surplus Wen Zaihang cleanup acid treatment, save the energy more and realize the serialization operation.

Claims

1, a kind of hot-rolled sheet heating anneal device of directly switching on is characterized in that, it constitutes the loop by two conductive rollers and power supply and steel plate forms, and it is installed in before the single-row unit of silicon steel or the pickling of the rolling associating unit of pickling in the kink.

2, the hot-rolled sheet according to claim 1 heating anneal device of directly switching on is characterized in that, described electric heater unit adopts steel plate itself as heating unit.