The tensile test of 20NV1300 and 27NV1400 non-oriented silicon steels in the range of 25 ~ 200 ℃ was carried out to study the influence of different ambient temperatures on the mechanical properties of non-oriented silicon steels. The results show that the mechanical properties of non-oriented silicon steel are sensitive to the ambient temperature. Within the test temperature range, the yield strength decreases with the increase of temperature, while the tensile strength decreases with the increase of ambient temperature within the range of 25 ~ 100 ℃. Due to the dynamic strain aging of non-oriented silicon steel at 100 ~ 200 ℃, its tensile strength increases in the range of 100~150 ℃ and decreases in the range of 150~200 ℃.

Physical modeling was employed to investigate the effects of ladle change time, casting speed, and turbulence inhibitor on slag movement and exposure behavior in a tundish during continuous casting of non-oriented silicon steels. The effect of the slag carry-over on slag entrainment in the tundish was also studied. Results show that there was a serious slag entrainment phenomenon in the impact zone during ladle change when the refilling time was 69 s and the turbulence inhibitor was not used. As the refilling time increased, the slag entrainment phenomenon was lowered and part of the top surface of the impact zone was exposed, indicating that reoxidation easily occurred under the current conditions. Increasing the casting speed increased the amount of entrained oil phase in the impact zone during ladle change. It would decrease the steel cleanliness. The installation of the turbulence inhibitor significantly decreased the amount of entrained oil phase and the exposed area in the impact zone during ladle change. It was suggested that the turbulence inhibitor should be used in the impact zone and the refilling time was larger than 180 s. According to the slag carry-over experiments, the adverse effect of the slag carry-over on the steel cleanliness could not be completely eliminated using the turbulence inhibitor and it could only diminish the slag entrainment and emulsification. The entrained slag might be a source of exogenous inclusions in the final product. Therefore, the slag carry-over from the teeming ladle should be strictly controlled during the actual casting process.

Based on the industrial manufacture of non-oriented silicon steel sheets, the influence of shear gap size, sample size, sample direction, and the ratio of yield and tensile on the magnetic properties were studied. The results show that with the increase of shear gap, the proportion of shear plane in thickness direction decreases gradually. Thus, the iron loss and magnetic induction will deteriorate by different degree, and the iron loss degradation rate is much higher than the magnetic induction degradation rate. Moreover, the iron loss degradation rate in the L direction is much higher than that in the C direction. With the decrease of sheared sample size, the iron loss and magnetic inductance will also deteriorate and are affected by the yield ratio of the material. The deterioration rate of magnetic properties is obvious increase with the increase of yield ratio for the sheared sample.

Taking advantage of the equipment renovation and control system upgrade of the Beiying 1 780 hot rolling unit, we have developed a production process for cold rolling of low and medium grade non oriented silicon steel hot rolling base materials for sheet metal. With the stability of the production process and the increase of output tasks, a large number of hole defects appear in the cold rolling process, causing huge cutting losses and seriously affecting the yield rate. Measures were taken to sample and inspect defects, uncoiler hot-rolled coils, track and compare hot-rolled gauges, and study equipment influencing factors to confirm the source of defects. These measures included changing the material of the guide strip lining for precision rolling and coiling, changing the guide strip control mode and reducing pressure, optimizing the opening degree of the guide strip upstream and downstream of the precision rolling mill, and optimizing the strip centering in finishing mill stands. As a result, the degradation rate of holes was reduced from 19.46 % to 1.65 %, significantly improving the yield rate.

For non-oriented medium and low grade silicon steel products, strip stamping defects caused by annealing furnace roll nodules are common defects in the quality control process of silicon steel. Generally, the higher the silicon content, the higher the probability of nodules occurring in blast furnace rolls. According to production experience, after the occurrence of furnace roll nodding, it is necessary to take measures such as online grinding of rolls, alkaline waste discharge, and increasing the current of brush rolls to slow down nodding, but the above methods can only make up for the negative impact of nodding to a certain extent, and cannot fundamentally eliminate nodding, which makes the production fall into a vicious cycle, not only can't meet the conditions of batch continuous production, but also can't. At the same time, it will affect the quality delivery of highend customer orders and reduce the market competitiveness of silicon steel brands. A series of comparison and verification experiments were carried out to control roll tumbler defects of annealing furnace, and effective measures were taken to control roll tumbler through the matching control of partial pressure ratio of annealing furnace and annealing process, ensuring good strip surface cleaning quality, and reasonably controlling roll speed and strip speed difference.

In this paper, the oriented silicon steel high temperature ring annealing furnace is briefly introduced, the combustion system composition and combustion control mode are outlined, the burner and its structure are introduced in detail, the combustion system and principle of the high temperature ring annealing furnace are analyzed, and the common faults and treatment measures of the burner are detailed according to the field operation experience.

This article analyzes the trial process of semi-high speed steel rolls in non-oriented silicon steel continuous rolling units, and compares them with traditional Cr₅ material rolls in several dimensions such as roll grinding, lower roll shape, roughness evaluation, and accident resistance.it is believed that semi-high speed steel rolls are significantly better than Cr₅ material rolls in improving the amount of steel passing, roll shape retention, and accident resistance of rolls.it is improved the rolling efficiency of the non-oriented silicon steel continuous rolling units and reducing rolling costs.

In view of the upgrading of cold-rolled non-oriented silicon steel products in a steel mill, the problem of plate deformation deformation and the reduction of the amount of steel in the middle roll in the production process, through the analysis of the reasons for the poor plate shape of the product, it is believed that the main reason is the excessive wear of the conical section of the intermediate roll, which leads to the reduction of the amount of steel in the use of the intermediate roll of the Sendzimir rolling mill.