Method and device for removing inner surface oxidized iron sheet of steel pipe on line

Abstract

The invention relates to a method and a device for removing an inner surface oxidized iron sheet of a steel pipe on line. A device for removing an inner surface oxidized iron sheet of a steel pipe from the tail of the steel pipe is arranged behind a stepping type reheating furnace, and the inlet section of a stepping type cooling bed is provided with a device for removing the inner surface oxidized iron sheet of the steel pipe from the head of the steel pipe. After the tail and the head of the steel pipe are detected by a hot metal detector, the device for removing the inner surface oxidized iron sheet of the steel pipe from the tail of the steel pipe sprays high-pressure water to an inner hole of the tail of the steel pipe and removes the oxidized iron sheet of the inner hole of the steel pipe, and the device for removing the inner surface oxidized iron sheet of the steel pipe from the head of the steel pipe sprays high-pressure water and a high-pressure gas to the inner hole of the head of the steel pipe so as to remove oxidized slag retained in the inner hole of the steel pipe. The inner surface oxidized iron sheet of the steel pipe is removed on line behind the stepping type reheating furnace and at the inlet section of the stepping type cooling bed, and the finishing procedure of the rear part of the steel pipe is reduced. The invention not only saves the cost of acid washing, shot blasting and grinding but also improves the production efficiency.

Description

technical field [0001] The invention relates to a method and a device for removing scale on the inner surface of a steel pipe, in particular to a method and a device for removing scale on the inner surface of a steel pipe. Background technique [0002] With the development of the steel pipe industry, users have higher and higher requirements for the quality of steel pipes, especially for high pot pipes. The user proposes to remove the scale on the inner surface of the steel pipe. The purpose of removing the scale on the inner surface of the steel pipe is to check the quality of the inner surface of the steel pipe, and It is important to prevent the inner oxide scale from clogging the pipeline after peeling off. The existing methods for removing the oxide scale on the inner surface of the steel pipe are off-line pickling, shot blasting and inner surface grinding of the steel pipe. Compared with the inner surface of steel pipes, inner surface grinding and shot blasting are ve...

AI Technical Summary

Problems solved by technology

Compared with the inner surface of steel pipes, inner surface grinding and shot blasting are very difficult, and the efficiency is also very low. Usually, one piece of equipment can only grind 3 to 5 pieces in one shift, which not only prolongs the production cycle of steel pipes, but also increases the production of steel pipes. Cost; the method of pickling to remove the oxide scale on the inner surface of the steel pipe is not effective, and there is over-acid corrosion, which has an impact on the quality of the steel pipe

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