Method for producing low alloyed steel continuous casting circular tube blank with a diameter of 350-400mm

Abstract

The invention provides a production method of a low alloy steel continuous casting round tube blank with the diameter of Phi 350 to Phi 400mm, comprising the following steps: the process conditions of a round tube blank crystallizer which is applicable to the ratio of the arc-shaped radius of a continuous casting machine and the diameter of the low alloy steel continuous casting round tube blank of 26.25 to 30 are selected; the parameters for low alloy steel casting blank cooling are selected; the low alloy steel casting blank secondary cooling system is prepared; and the parameters of the continuous casting process of the low alloy steel continuous casting blank are selected. The production method has the effects that the production method can ensure the quality of the low alloy steel casting blank to be in line with the requirements of the continuous casting process of the continuous casting round tube blank under the equipment condition that the ratio of the arc-shaped radius of the continuous casting machine and the diameter of the continuous casting round tube blank is 26.25 to 30.The non-round degree, the end-surface cut square, the curvature, the defects of the acid leaching macrostructures, the acid leaching macrostructures and the surface quality of the produced casting blank with the diameter of Phi 350 to Phi 400mm are all in line with the requirements of continuous casting round tube blank YB / T 4149-2006 of the black metallurgical industry standards of the People's Republic of China.

Description

technical field [0001] The invention relates to a production method of a low-alloy steel continuous casting round tube blank, in particular to a production method of a low-alloy steel continuous casting round tube blank with a diameter of Φ350-Φ400mm. Background technique [0002] At present, the Φ350~Φ400mm low-alloy steel continuous casting round tube blanks produced in China are all produced on continuous casting machines with an arc radius of 12m and above, but Φ350mm should be produced on continuous casting machines with a smaller arc radius such as 10.5m. ~Φ400mm low-alloy steel continuous casting round billet, the main technical limitation is: the mold matching the above continuous casting machine needs to meet the cooling system requirements for the production of Φ350~Φ400mm low-alloy steel continuous casting round billet, at the same time To ensure that the surface temperature of the low-alloy steel continuous casting round tube billet avoids the brittle temperature...

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Problems solved by technology

[0003] In order to solve the problems existing in the above-mentioned technologies, the object of the present invention is to provide a production method of low-alloy steel continuous casting round tube billet with a diameter of Φ350~Φ400mm, so as to facilitate the cooling of the mold on the continuous casting machine with a smaller arc radius. Strength problem; effectively solve the problem of secondary cooling water distribution on the continuous casting machine with small arc radius; at the same time solve the problem of excessive deformation of the casting billet at the straightening point when producing large-scale low-alloy steel continuous casting round billet due to the small radius billet quality problems

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