Seamless calcium line and preparation method thereof

Abstract

The invention relates to a seamless calcium line and a preparation method thereof. The seamless calcium line which is a line body formed by wrapping a solid calcium core with a shell is characterized in that: the shell is a seamless steel shell, and the weight ratio of the solid calcium core to the seamless shell in the line body of each unit length is 1:2.3-5.7. The seamless calcium line of the invention has the following advantages: the rigidity of the calcium line is high, so the line can be fed to deep parts of a steel ladle, splashing can be alleviated or avoided, calcium can be uniformly distributed in the steel ladle, the calcium line usage efficiency is greatly improved, the calcium recovery rate is improved 2-5 times, and the inclusion removal effect is good; and the feeding amount of a core wrapping line is reduced, the calcium processing time is saved, the temperature loss in the molten steel calcium processing process is reduced, and the molten steel nitrogen and oxygen increasing case in the molten steel processing process are effectively improved. The seamless calcium line produced with the technology of the invention has the advantages of high efficiency, low cost, and easy enforcement and popularization.

Description

technical field [0001] The invention relates to the technical field of molten steel refining, in particular to a seamless calcium wire and a preparation method thereof. Background technique [0002] Wire feeding technology is a new molten steel refining technology developed after powder spraying technology. It is to make the materials required for deoxidation, desulfurization, carburization, inclusion denaturation, and composition fine-tuning of molten steel into thread-like objects (solid wire or cored fleece filled with relevant powder), and use the mechanical force of the wire feeding machine to feed it to a certain extent. A new type of secondary refining technology that passes through the molten steel surface at a high speed to reach the deep part of the molten steel. Compared with other secondary refining technologies, especially powder spraying technology, it has the advantages of high alloy harvest, accurate composition control, simple equipment, less investment, s...

AI Technical Summary

Problems solved by technology

Moreover, a higher wire feeding speed is required to make the wire feed into the ladle to the optimum depth, and the speed should be controlled at 160-300m / min, because the strip steel is thin and cannot be fed into the bottom of the ladle and is easy to splash and have belt Steel cracking phenomenon, calcium cannot be evenly distributed in the ladle

The traditional Ca-Si cored wire and Ca-Al cored wire are affected by the production process, and the yield of Ca is unstable, which is not conducive to the control of molten steel quality

Compared with seamed products, the production process of seamless solid pure calcium cored wire is more complicated, and there are fewer domestic enterprises capable of producing it, most of which are still in the research and development stage

Moreover, it is difficult to produce larger-diameter solid calcium wires with existing technology, and thinner solid calcium wires require a high wire feeding speed, which makes it difficult to control the release position in the ladle.

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