Reinforced seamless steel pipe piercing plug and manufacturing method thereof

Abstract

The invention discloses a reinforced seamless steel pipe piercing plug. The piercing plug comprises a piercing plug base body, wherein a transition layer and a reinforcing layer are sequentially arranged on the outer surface of the piercing plug body from inside to outside; the transition layer is manufactured from the following components in parts by weight: 61.0%-79.0% of Fe, 5.0%-10.0% of Co, 10.0%-15.0% of Cr, 5.0%-10.0% of Mo, and 1.0%-4.0% of Ni; and the reinforcing layer is composed of, by mass, 96% of main materials and 4% of additives, specifically, the main materials comprise the following components in parts by weight: 20.0%-30.0% of Co, 20.0%-30.0% of Ni, 15.0%-20.0% of Cr, 5.0%-5.5% of Nb, 1.0%-2.5% of Si, 1.0%-2.0% of W, 1.0%-1.8% of C, 3.5%-5.0% of B, 0.5%-0.9% of rear earth, and 2.3%-30.7% of Fe. The piercing plug has good strength and hardness as well as higher high-temperature resistance, the friction of the piercing plug and the steel pipe is reduced, and the qualityof the inner wall of the steel pipe is improved, so that the workload for subsequent processing of the steel pipe is reduced; and moreover, the amount of steel adhering to the surface of the piercingplug is reduced, and the workload of workers is reduced as well.

Description

technical field [0001] The invention relates to the field of technical piercing plugs, in particular to a reinforced seamless steel pipe piercing plug and a preparation method thereof. Background technique [0002] The piercing machine is mainly used for the manufacture of seamless steel pipes, which mainly consists of a pair of inclined rollers and a piercing head. The piercing machine presses the steel billet into the plug while rotating the steel billet in the circumferential direction through the inclined roller, and pierces and rolls the billet to form a hollow tube billet. The piercing plug is arranged on the rolling line between a pair of inclined rolls. It is a key component in the production of seamless steel pipes. Its performance directly affects the output, quality and economic benefits of the steel pipe production. [0003] During the manufacturing process of seamless steel pipe, the steel billet needs to be heated to high temperature. Therefore, the piercing p...

AI Technical Summary

Problems solved by technology

[0005] (1) Low temperature wear resistance, resulting in low service life of the plug;

[0006] (2) The high temperature deformation is serious, and the surface of the deformed and worn plug is uneven, resulting in poor quality of the inner wall of the steel pipe, increasing the difficulty of subsequent processing of steel pipe manufacturing, and increasing production costs;

[0007] (3) Hot sticky steel is produced on the surface, and the sticky steel will scratch the inner wall of the steel pipe. Usually, after a certain number of steel pipes are threaded, it is necessary for individuals to polish the surface of the plug to increase labor intensity.

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