A kind of reinforced seamless steel pipe piercing plug and its preparation method

Abstract

The invention discloses a reinforced seamless steel pipe perforated plug, comprising a plug base, a transition layer and a strengthening layer are sequentially arranged on the outer surface of the plug base from the inside to the outside, and the transition layer includes the following components in parts by weight: iron : 61.0-79.0%; Co: 5.0-10.0%; Chromium: 10.0-15.0%; Mo: 5.0-10.0%; Nickel: 1.0-4.0%; The additive with a fraction of 4% is composed of two parts, and the main material includes the following components by weight: cobalt: 20.0-30.0%; nickel: 20.0-30.0%; chromium: 15.0-20.0%; niobium: 5.0-5.5% ; silicon: 1.0-2.5%; tungsten: 1.0-2.0%; carbon: 1.0-1.8%; boron: 3.5-5.0%; rare earth: 0.5-0.9%; iron: 2.3-30.7%, the present invention has good strength and In addition to the hardness, it also has high temperature resistance, which can also reduce the friction between the plug and the steel pipe, and improve the quality of the inner wall of the steel pipe, thereby reducing the workload of the subsequent processing of the steel pipe, which is also conducive to reducing the sticking of steel on the surface of the plug, and also reduces the workmanship. workload.

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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