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Method for producing semi-processed cold-rolled non-oriented electrical steel

A technology for grain-oriented electrical steel and production methods, applied in metal rolling, elongation control and other directions, can solve the problems of poor magnetic properties and dimensional accuracy, difficult to meet mechanical and electrical products, and unusable by customers, and achieve weight reduction and low production costs. , the effect of reducing the size of the motor

Inactive Publication Date: 2011-10-19
山东泰山轧钢有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Even if the stress annealing is carried out at a higher temperature, not only the problem of internal oxidation is prone to occur, but also the iron loss value is too high, which is difficult to meet the requirements of the continuous development of electromechanical products in the direction of miniaturization, high magnetic induction, and low iron loss.
[0004] Because cold-rolled electrical steel has very strict requirements on magnetic properties and plate shape, in the production process of cold-rolled non-oriented electrical steel, the control of annealing heating rate, annealing holding time control, annealing cooling rate control and time control, and product thickness control are difficult points. , it is easy to cause poor magnetic properties and dimensional accuracy of the product, resulting in customers being unable to use

Method used

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  • Method for producing semi-processed cold-rolled non-oriented electrical steel
  • Method for producing semi-processed cold-rolled non-oriented electrical steel
  • Method for producing semi-processed cold-rolled non-oriented electrical steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The production steps of semi-process cold-rolled non-oriented electrical steel are:

[0021] (1) Pickling: Pickle the non-oriented hot-rolled silicon steel strip with grade W600 using shallow groove turbulent flow push-pull pickling technology. The temperature of the first-stage acid bath is controlled at 80°C, and the last-stage acid bath The temperature of the solution is controlled at 60°C, and the concentration of the acid solution is controlled at 160g / L.

[0022] (2) Rolling: The steel strip after pickling is rolled to the set thickness by a six-high HC rolling mill, and the cold rolling deformation rate is ≥80%. In the final pass of rolling, a reasonable reserved amount is set to improve thickness control precision.

[0023] (3) Electrolytic degreasing:

[0024] The rolled steel strip is degreased by an electrolytic degreasing unit to remove grease and iron powder on the surface.

[0025] (4) Annealing:

[0026] The degreased steel strip is annealed in a full...

Embodiment 2

[0030] The production steps of semi-process cold-rolled non-oriented electrical steel are:

[0031] (1) Pickling: Pickle the non-oriented hot-rolled silicon steel strip with grade W800 using shallow groove turbulent flow push-pull pickling technology. The temperature of the first-stage acid bath is controlled at 90°C, and the last-stage acid bath The temperature of the solution is controlled at 70°C, and the concentration of the acid solution is controlled at 200g / L.

[0032] (2) Rolling: The steel strip after pickling is rolled to the set thickness by a six-high HC rolling mill, and the cold rolling deformation rate is ≥80%. In the final pass of rolling, a reasonable reserved amount is set to improve thickness control precision.

[0033] (3) Electrolytic degreasing:

[0034] The rolled steel strip is degreased by an electrolytic degreasing unit to remove grease and iron powder on the surface.

[0035] (4) Annealing:

[0036] The degreased steel strip is annealed in a full...

Embodiment 3

[0040] Production of semi-process cold-rolled non-oriented electrical steel, step (4) annealing:

[0041] The degreased steel strip is annealed in a full hydrogen bell annealing furnace, the heating time is controlled within 10 hours, recrystallization annealing is carried out at 780°C for more than 12 hours, and it is cooled slowly to 500°C and then cooled to 80°C with a cooling cover and released from the furnace ; Other steps are with embodiment 1.

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Abstract

The invention relates to a method for producing semi-processed cold-rolled non-oriented electrical steel, which comprises the steps of pickling, rolling, electrolytically degreasing, annealing and leveling of non-oriented hot-rolled silicon steel, wherein annealing is performed in a full-hydrogen bell-type annealing furnace by first heating to 730 to 820 DEG C within 10 hours, then recrystallizing and annealing for more than 12 hours at 730 to 820 DEG C, next slowly cooling to 600 to 500 DEG C, later on cooling in a cooling cover to 80 to 60 DEG C and finally discharging. In the semi-processed non-oriented cold-rolled electrical steel with a mark of 50WB800 produced by the invention, the product magnetism is characterized in that: the P1.5 / 50 is 7.181W / kg; and the B5000 is 1.708T. Compared with the requirements of corresponding standards of the common semi-processed cold-rolled non-oriented electrical steel, the iron loss value is reduced by 0.819W / kg, and the magnetic induction is improved by 0.008T. As a material for iron cores of motors and generators working in rotary magnetic fields, the semi-processed cold-rolled non-oriented electrical steel produced by the method has high magnetic performance and technical performance.

Description

technical field [0001] The invention relates to a method for producing electrical steel for motor cores, in particular to a method for producing semi-process cold-rolled non-oriented electrical steel with high magnetic induction and low iron loss in a bell annealing furnace. Background technique [0002] Cold-rolled non-oriented electrical steel, as the rotor core material of motors and generators working in a rotating magnetic field, has good magnetic and process properties, and is an indispensable and important soft magnetic alloy in electric power, electronics and military industries. [0003] The current method of producing semi-process cold-rolled non-oriented electrical steel adopts continuous annealing process for production, and the construction of a continuous annealing production line requires a large investment and occupies a large area. Although the physical properties of the ex-factory products can be guaranteed, the user must anneal at a higher temperature afte...

Claims

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Application Information

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IPC IPC(8): C21D8/12C21D1/26C21D3/04B21B1/28B21B37/56
Inventor 王永胜陈培敦刘金元任来锁郎宝山侯元新亓萌朱爱美刘文宪
Owner 山东泰山轧钢有限公司
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