Refining and continuous casting method for producing alloy cold heading steel from billets
A technology for producing alloys and billets, which is applied in the field of out-of-furnace refining technology and continuous casting, can solve the problems that the effect of protection and casting is greatly affected, and the purity of molten steel is difficult to ensure, so as to achieve the effect of ensuring the purity of steel.
Active Publication Date: 2021-04-02
ANGANG STEEL CO LTD
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Problems solved by technology
[0005] It is not difficult to control the composition of this steel grade, but this steel grade has high requirements on the purity and uniformity of the steel quality during use, and the refining furnace of the billet production line with a section of 160mm*160mm in a steel factory has no vacuum degassing equipment , it is difficult to guarantee the purity of molten steel, the continuous casting machine does not have a ladle rotary table, and the immersion nozzle seal is a counterweight method, which has a great impact on the protection of the casting effect
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Embodiment 1
[0040] Produce a tank of billet high-grade alloy cold heading steel with a cross-section of 160mm*160mm. The weight of molten steel in the tank is 90 tons. The smelting process of the LF furnace is to add enough Al in the early stage, blend the alloy once in the later stage, reduce S, and control N. Carry out with the method of weak blowing, adjust the argon flow rate to 350NL / min at the beginning of smelting, and add 156Kg of aluminum line section at the same time, and immediately add slagging material after stirring for 1 minute (add 540kg of lime, 180kg / ton of bauxite); After the slag is added, heat up to 20°C-40°C, and adjust the argon flow rate to 85NL / min to melt the top slag; after stopping heating, adjust the argon flow rate to 200NL / min to stir for 3 minutes, and then perform sampling operation After sampling, add slagging material for the second time (90kg of lime, 27kg of bauxite), and then heat up for the second time by 10°C-30°C, and adjust the argon flow rate to 8...
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The invention relates to a refining and continuous casting method for producing alloy cold heading steel by using billets, and aims at achieving the purpose of smoothly producing qualified high-classcold heading steel by using an LF refining furnace and a billet continuous casting machine. The method comprises the steps that sufficient Al is added previously in one attempt in the controlling of the LF refining furnace, alloy is blended in one attempt subsequently, S is reduced, N is controlled and weak blowing is conducted; protecting casting is adopted in continuous casting controlling, andcosting blanks are output in a constant pulling speed state. The method has the advantages that the smooth production of producing high-class alloy cold heading steel by using an LF furnace technologywhich is equipped with a billet continuous casting technology, the steel purity of the steel is ensured, the using demands of users are ensured, and a certain foundation is laid for the development of the steel.
Description
technical field [0001] The invention belongs to the field of refining technology outside the furnace and continuous casting technology, and in particular relates to a refining and continuous casting method for producing alloy cold heading steel from billets. Background technique [0002] The main components of high-grade alloy cold heading steel (ML20MnTiB) are shown in Table 1: [0003] Table 1 [0004] [0005] It is not difficult to control the composition of this steel grade, but this steel grade has high requirements on the purity and uniformity of the steel quality during use, and the refining furnace of the billet production line with a section of 160mm*160mm in a steel factory has no vacuum degassing equipment , It is difficult to ensure the purity of molten steel. The continuous casting machine has no ladle rotary table, and the submerged nozzle seal is a counterweight method, which has a great influence on the protection of the casting effect. Contents of the...
Claims
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IPC IPC(8): C21C7/06C21C7/00B22D11/00
Inventor 孙振宇赵晨光许海亮王华东温荣宇张月
Owner ANGANG STEEL CO LTD