Continuous casting method for improving central shrinkage cavity of small high-carbon steel square billet
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A technology of center shrinkage and small billet, applied in the field of metallurgy, can solve problems such as center shrinkage of finished products, and achieve the effect of simple operation means, cost reduction and strong operability
Active Publication Date: 2014-01-15
ANGANG STEEL CO LTD
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[0003] The invention provides a continuous casting method for improving the central shrinkage cavity of high-carbon steel billets, and solves the problems of ce
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Embodiment 1
[0014] (1) During the continuous casting process, the pouring is protected throughout the process, the superheat is 20°C, and the amount of argon blowing at the submerged nozzle is 18L / min.
[0015] (2) The average casting speed corresponding to each crystallizer is 2.8 m / min, the cooling specific water volume of the secondary cooling water in the secondary cooling section of each crystallizer is 0.8 L / kg, and the whole process is air mist cooling,
[0016] (3) Use 460A, 5Hz crystallizer electromagnetic stirring and 0.5mm solidification end to lightly press down,
[0017] (4) Rolling the 120mm*120mm billet into a wire rod to obtain a finished high-carbon steel hot-rolled wire rod.
Embodiment 2
[0019] (1) During the continuous casting process, the pouring is protected throughout the process, the superheat is 25°C, and the argon blowing rate at the submerged nozzle is 18L / min.
[0020] (2) The average casting speed corresponding to each crystallizer is 3.0 m / min, the cooling ratio of the secondary cooling water in the secondary cooling section of each crystallizer is 1.0 L / kg, and the whole process is air mist cooling,
[0021] (3) Use 470A, 6Hz crystallizer electromagnetic stirring and 1.0mm solidification end to lightly press down,
[0022] (4) Rolling the 120mm*120mm billet into a wire rod to obtain a finished high-carbon steel hot-rolled wire rod.
Embodiment 3
[0024] (1) During the continuous casting process, the pouring is protected throughout the process, the superheat is 20°C, and the amount of argon blowing at the submerged nozzle is 20L / min.
[0025] (2) The average casting speed corresponding to each crystallizer is 3.0 m / min, the cooling ratio of the secondary cooling water in the secondary cooling section of each crystallizer is 1.2 L / kg, and the whole process is air mist cooling,
[0026] (3) Use 480A, 7Hz crystallizer electromagnetic stirring and 0.8mm solidification end to lightly press down,
[0027] (4) Rolling the 120mm*120mm billet into a wire rod to obtain a finished high-carbon steel hot-rolled wire rod.
[0028] The result of the inspection of the high carbon steel wire rods of the implementations 1~3 is that the central shrinkage cavity of the finished product disappears.
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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...
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