Rolling mill technique of three-roller full-floating core rod tandem rolling tube

Abstract

The invention relates to a process of rolling a three-roll continuous rolling pipe, and belongs to the technical field of the production process of a hot rolled seamless steel pipe. The invention adopts a pipe rolling process by using a three-roll full-floating mandrel continuous rolling pipe; a diameter continuous casting round billet is used as a raw material; the heated raw material is pierced by a cone-shaped roll piercer, enters a continuous pipe rolling mill, and is rolled into an outside pierced billet; through the operation procedures of reheating, diameter reduction, etc., the high-quality small-caliber hot rolled seamless steel pipe is produced. By adopting the process of the three-roll full-floating mandrel continuous rolling pipe, the three-roll continuous rolling pipe achieves high production capacity (is twice as much as the production capacity by the traditional process), high metal yield (can be improved by 1.5 percent) and low consumption (energy resources can be saved by over 15 percent).

Description

technical field [0001] The invention relates to a rolling process of a three-roller full-floating mandrel continuous rolling tube, which belongs to the technical field of producing hot-rolled seamless steel tubes. Background technique [0002] The traditional rolling process uses continuous casting round tube blanks as raw materials. After heating to 1250-1280°C, it is pierced and rolled into capillary tubes by using a two-roll piercer with guide discs. The full-floating mandrel tube rolling process is used on the machine to roll the capillary tube into a waste tube. After the head and tail of the waste pipe need to be cut off, it is reheated and rolled into a steel pipe by a multi-stand tension reducer, and then enters the cooling bed. [0003] In the traditional rolling process, when the full-floating mandrel tube rolling process is used on the two-roller continuous tube mill, there will be different degrees of "bamboo" phenomenon at both ends of the blank tube, which wil...

AI Technical Summary

Problems solved by technology

[0003] In the traditional rolling process, due to the use of the full-floating mandrel tube rolling process on the two-roller continuous tube mill, there will be different degrees of "bamboo" phenomenon at both ends of the blank tube, which will increase the head and tail loss.

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