Continuous casting method for improving central shrinkage cavity of small high-carbon steel square billet

Abstract

The invention discloses a continuous casting method for improving a central shrinkage cavity of a small high-carbon steel square billet. According to the continuous casting method for improving the central shrinkage cavity of the small high-carbon steel square billet, the degree of superheat, the amount of blown argon of a submersed nozzle and full-protection casting are controlled, the cooling specific water flow for secondary cooling and casting speed are adjusted, and soft reduction of the final stage of electromagnetic stirring and solidification of each crystallizer is carried out. The specific technological parameters are that the amount of blown argon of the submersed nozzle is controlled to be 15-20L / min under the condition that the full-protection casting is adopted, the average casting speed of a casting blank corresponding to each crystallizer is 2.6-3.0m / min, the cooling specific water flow of cooling water in the secondary cooling section of each crystallizer is 0.8-1.2L / kg, and aerosol cooling is carried out; casting with the low degree of superheat is adopted in the whole process, the degree of superheat is 20-40 DEC C, and soft reduction of the final stage of the crystallizer electromagnetic stirring under the condition of 460-480 A and 5-7Hz and solidification under the 0.4-4.5m condition is adopted. The continuous casting method for improving the central shrinkage cavity of the small high-carbon steel square billet has the advantages that the flow of the inlet gas and the specific water flow can be accurately controlled, cost is reduced, and products meeting all specifications are produced through adjustment of all parameters.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a continuous casting method for improving the central shrinkage cavity of a high-carbon steel billet used for producing high-carbon steel wire rods. Background technique [0002] High-carbon steel wire rod (generally refers to steel with a C content greater than 0.45%) is mainly used in steel wire ropes, packaging lines, etc., and is usually produced from billets. Due to the high carbon content and poor casting control, bubbles, shrinkage cavities and other phenomena will appear in the continuous casting process, and defects such as center segregation and porosity are often accompanied. These transfers to the downstream will lead to the phenomenon of "bulging" in the macroscopic view of the wire rod supplied. These defects are determined by multiple parameters, and each parameter affects each other. During the continuous casting process, the temperature generally...

AI Technical Summary

Problems solved by technology

[0003] The invention provides a continuous casting method for improving the central shrinkage cavity of high-carbon steel billets, and solves the problems of central shrinkage cavity of rolled products caused by air bubbles and shrinkage holes in the continuous casting process when producing high-carbon steel wire rods.