Electric furnace continuous casting short process production method of oil well pipe billets

Abstract

The invention relates to an electric furnace continuous casting short process production method of oil well pipe billets and the method comprises electric arc furnace smelting, LF external refining, VD vacuum treating, full protection pouring and continuous casting of round tube billet and tube rolling; a conticaster for both square and round billets is used, when producing square or round billets, only the crystallizer assembly and nozzles in second cooling zone first section, second cooling zone second section and second cooling zone third section are needed to change, in the crystallizer assembly, the conical degree of the crystallizer copper tube is parabolic shape, and the crystallizer adopts hydraulic non-sinusoidal oscillation, wherein the amplitude is 0+ / -5mm, the vibration frequency is 40-360 times / min and the maximum skewness of non-sinusoidal wave is 40%. The method of the invention can realize the electric furnace continuous casting short process production method of zero defect oil well pipe billets, solve the surface and inner quality problem of continuous casting well pipe billets and meet the quality requirements for rolling the oil well pipe.

Description

technical field [0001] The invention belongs to the field of iron and steel smelting, and relates to an integrated technology for producing oil well pipe billet steel by an electric furnace continuous casting short-flow process. technical background [0002] There are two ways to produce round billet steel, one is to use continuous casting billet to roll into round billet by rolling mill; the other is to directly produce round billet by continuous casting machine. Since continuous casting of round billets to produce seamless steel pipes can greatly increase the yield of molten steel and save energy, the development of continuous casting of round billets is a future development trend. [0003] During the 10 years from 1991 to 2001, the consumption of seamless steel pipes increased from 3.5 million tons to 509 tons. During the four years from 2001 to 2004, the consumption of seamless steel pipes increased from 5.09 million tons to 9.02 million tons. Seam steel pipe consumptio...

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Problems solved by technology

[0006] However, none of the above production processes integrate the technology of producing oil well pipe billet steel with square and round billets combined with continuous casting machines, and the application is not comprehensive. Therefore, the production level of oil well pipe billet steel needs to be further improved

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