Stopper rod for continuous casting of high-oxygen steel

Abstract

The invention relates to a stopper rod for continuous casting of high-oxygen steel. The stopper rod comprises a rod head, a rod body and a slag line section, wherein the rod head is made of Spinel-C and comprises the following chemical components in percentage by weight: 60 to 72 percent of Al2O3, 20 to 30 percent of MgO, 5 to 10 percent of C and the balance of trace impurities, and an antioxidant and a phenolic resin binding agent are additionally added; the rod body is made of Al2O3-Spinel-C and comprises the following chemical components in percentage by weight: 70 to 80 percent of Al2O3, 5 to 10 percent of MgO, 15 to 23 percent of C and the balance of trace impurities, and an antioxidant and a phenolic resin binding agent are additionally added; and the slag line segment is made of a MgO-Spinel-C material. According to the invention, when being applied to high-oxygen steel casting, the low-melting-point phase cannot be formed, good corrosion resistance is achieved, recarburization of molten steel is reduced, and the number of continuous casting furnaces is increased.

Description

technical field [0001] The invention relates to the technical field of steelmaking and continuous casting, in particular to a stopper rod for continuous casting of high-oxygen steel. Background technique [0002] Stopper rods belong to the three major functional refractory materials for continuous casting, and play a very important role in continuous casting production. During the continuous casting of molten steel, the flow of molten steel needs to be controlled to obtain a suitable casting speed and a qualified slab. The control methods of molten steel flow include slide plate flow control and stopper rod flow control. Although the flow control of the slide plate is accurate, it is easy to suck air, which is not good for the quality of molten steel, and it is easy to produce bias flow. Stopper rod flow control has the advantages of less air intake and non-biased flow of molten steel. The stopper rod is divided into integral stopper rod and sleeve brick stopper rod accord...

AI Technical Summary

Problems solved by technology

However, for steel types with high oxygen content (above 250ppm), such as high-oxygen enamel steel, such stoppers cannot meet the requirements of continuous casting for multiple furnaces. On the one hand, the C in the stopper is due to the oxygen content of the steel It is oxidized due to high content, and the corrosion of the stopper rod is accelerated with oxidation and decarburization, and the stopper rod is obviously thinner. At the end of continuous casting, the stopper rod cannot be closed, resulting in dripping of molten steel. On the other hand, the stopper rod will also add some fused silica ( The main component is SiO 2 ) to improve thermal shock resistance, but the high-oxygen steel also contains iron oxide and manganese oxide, which is different from the Al in the stopper 2 o 3 and SiO 2 Formation of low melting point phases also accelerates stopper erosion

[0004] In addition, the thermal expansion coefficients of the head and body of the existing stopper rods are quite different, such as MgO-C head and Al 2 o 3 -SiO 2 -C rod body, it is easy to crack or even break at the joint between the rod head and the rod body

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