Introduction The foreign substances in the black stripe defect are mainly magnesium-alumina spinel and feldspar, and a small amount of perovskite, which comes from ladle slag.The foreign material in the gray stripe defect is mainly magnesium oxide and contains a small amount of feldspar.The foreign material in the irregular strip gap is mainly alumina, containing…
After the first successful research in Japan, the magnesia carbon brick was first used in the hot spot of the high and ultra high power electric furnace and the air supply nozzle of the bottom blowing converter. In the future, Japan used magnesia carbon bricks in various parts of the converter. The life of the converter is increased by about 1.3 to 1.6 times compared with the magnesium dolomite brick immersed in tar.
The top-bottom combined blown converter is currently the most widely used steelmaking equipment in the world, and the length of the lining life directly affects the converter operation rate and production cost of the steel mill. In recent years, with the development of converter steelmaking towards high-strength, large-scale and smelting high-quality steel grades, higher requirements have been placed on furnace-lined refractories.
In order to overcome the segregation defect of high-speed steel roll in centrifugal casting, Nippon Steel Co., Ltd. developed the c-matching method (continuous casting outer layer forming method) for manufacturing high-speed steel roll. 1 it has the characteristics of energy saving and good roll performance. Its basic principle is to cast the molten steel as…
Excessive rolling force and rolling moment are the main reasons for the fracture of the root of the working roller neck and the twisting of the roller diameter bearing force.The fracture of the root of the roller neck may also be caused by the small radius of the circular Angle when the roller root is…
The influence of the change in the crown of the backup rolls on the crown of the strip is significantly reduced relative to the crown of the work roll. Since changing the crown of the backup rolls can only adjust the contact state between the work roll and the backup roll, it does not work…
Relations between work roll diameter and work roll crowning rate When the diameter of the work rolls is taken as the basic value of 01722 m, the minimum value is 01600 m, the average value is 01700 m and the maximum value is 01800 m, the influence of the work roll crown on the width…
A common method of improving the shape of the plate is to compensate for the shape of the plate by changing the crown of the work roll. This method not only makes the shape of the no-load roll gap more reasonable, but also improves the contact between the work roll and the backup roll, thereby…
The work roll is subjected to quenching and rapid heat during operation, and there are temperature alternating stress and temperature gradient stress in the roll, and at the same time, it is subjected to bending deformation under rolling pressure, and tensile and compressive stress are repeatedly generated in the roll, and the internal stress acts.…
In the production of hot rolled sheet, because the working roll contacts the rolling piece directly, bears certain high temperature, certain rolling pressure and transfers considerable rolling moment at the same time, its damage is quite serious in the rolling process compared with other parts of the rolling mill. The work roll is a large…
