Steel tube as well as processing method and processing equipment for steel tube

Abstract

The invention discloses a processing method for a steel tube. The processing method comprises the following steps of: carrying out inner wall quenching on the steel tube to enable the steel tube to integrally form a martensite structure; carrying out medium-temperature tempering on the outer wall of the steel tube, which is processed by an inner wall quenching process, to enable the outer wall toform a tempered troostite structure; and meanwhile, carrying out low-temperature tempering on the inner wall to enable the inner wall and part of adjacent outer wall to form a tempered martensite structure. Therefore, the inner wall of the processed steel tube has higher hardness and wear resistant; the outer wall of the processed steel tube has higher toughness; and the processed steel tube can completely meet the requirements of wear resistance and toughness. The invention also discloses processing equipment for the steel tube. The processing equipment comprises a clamper for clamping the steel tube, an inner wall quenching device of a quenching sensor as well as an outer wall tempering device of a tempering sensor, wherein the inner wall quenching device can be moved inside the steel tube; and the outer wall tempering device can be moved on the outer wall of the steel tube. The processing equipment can be used for simultaneously finishing the inner wall quenching process and the outer wall tempering process and has high processing efficiency. The invention further provides the steel tube obtained by the processing method and the processing equipment disclosed by the invention.

Description

technical field [0001] The invention relates to the processing field of steel pipes, in particular, to a processing method of steel pipes, processing equipment for completing the processing method, and steel pipes processed by the processing method. Background technique [0002] At present, there is a wide demand for a steel pipe such as a concrete conveying pipe on various equipment such as a concrete pump truck. On the one hand, this kind of steel pipe is required to have high hardness and is not easy to wear through. On the other hand, there is a limit to the overall weight of the pipe fittings, and the wall thickness cannot be too thick because of the wear-resistant layer. This requires a wear-resistant process for steel pipes such as this conveying pipe. [0003] In the prior art, a treatment method is to put the whole seamless steel pipe into a quenching furnace for quenching to increase the hardness of the pipe body, but this will make the pipe body brittle, reducing...

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Problems solved by technology

[0004] In the above-mentioned first method, due to the need for overall quenching and tempering facilities, the volume and investment are large, and many workpieces need to be processed in one furnace, the speed and sequence of workpieces entering and exiting the furnace will have a great impact on the performance of the workpiece, resulting in heat treatment. The process control is difficult and the process stability is poor, especially it is difficult to control the temperature of the inner and outer walls of the steel pipe during tempering treatment, resulting in the inability to obtain a stable structure, so that the steel pipe cannot achieve the purpose of both wear resistance and toughness of the steel pipe

[0005] In another method, due to the need to control the outer wall of the steel pipe from being quenched, it is necessary to control the quenching process of the inner wall very accurately. However, in actual processing, due to factors such as equipment and input current instability, it is often easy to cause the pipe wall to be partially quenched. The disadvantage of penetration, once the pipe wall is partially hardened, it cannot be detected through routine inspections, so that the pipe fittings in work will cause the bursting of the hardening point, so that the expected life cannot be reached, and it may also become a safety hazard

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