Serial high-magnetic induction non-orieted electrical steel and its production process

Abstract

The present invention relates to an electrical steel and its production, especially, the components and production process of a high-magnetic induction, low-iron loss non-oriented electrical steel. By means of regulating alloy element content, reducing gas inclusion and nitride forming element content, adding segregation element, low temperature hot rollng, once cold rolling, and annealing at thetemperature determined based on T(ann)=786.83K+61.04Si(%), the electrical steel is produced. The product of 0.50 mm thickness has a P1.5=2.70-13.00 W / Kg, B(5000)=1.76-1.82 T, and excellent cooperation between iron loss and magnetic induction. The electrical steel is suitable for use in iron core in various motors.

Description

【Technical field】 [0001] The invention relates to a high magnetic induction series non-oriented electrical steel and its production method, specifically iron loss P 1.5 It is equivalent to the current low, medium and high grades of ordinary cold-rolled non-oriented silicon steel, and the magnetic induction B 5000 The composition and production method of high magnetic induction and low iron loss series cold-rolled non-oriented electrical steel that is 0.12T higher than the corresponding grades. 【Background technique】 [0002] Before the present invention, ordinary non-oriented silicon steel was used in large quantities in the market. Its Si and Al content was high. Surface oxidation occurs, which deteriorates iron loss and magnetic induction, and its magnetism is difficult to meet the requirements of miniaturization, high precision and high efficiency of electromechanical products. In recent years, there have been many reports on the development of high magnetic induction n...

AI Technical Summary

Problems solved by technology

For example: Nippon Steel Patent Publication No. 8-143960 "Manufacturing method of non-oriented electrical steel sheet with high magnetic induction and low iron loss", requires Ti1 The disadvantage of coiling below the temperature is that the content of Ti and Nb in the composition is strictly controlled, and the general steelmaking raw materials are difficult to meet the requirements, and the hot rolling coiling temperature is high and the range is narrow, so it is also difficult to control

There are also Nippon Steel’s published JP 10-60531 “Controlled finish rolling to produce high magnetic induction non-oriented silicon steel” and JP 10-605311 “Controlled finish rolling to produce low-silicon high magnetic induction non-oriented silicon steel sheet” and other requirements for hot-rolled finish. During rolling, at least one pass with a strain rate of 150s -1 Above, and the tension between at least one set of racks is 1.5kgf / mm 2 Above, the finish rolling temperature is about 750°C or (Ar3+Ar1) / 2, or recrystallization annealing is carried out above 700°C and below Ac1. The disadvantage is that the hot rolling process conditions are harsh, and it is difficult to achieve

At the same time, none of the above technical products have formed a series, which is not conducive to the production organization and product serialization of manufacturers and users