Method for laser additive manufacturing of seamless steel pipe piercing plug

Abstract

A method for laser additive manufacturing of a seamless steel tube piercing plug relates to the technical field of seamless steel tube processing. Comprising the following steps that S1, the surface of a base body of the steel pipe piercing plug is polished, and the thickness of a working layer required by laser material increase is reserved; s2, the surface of the base body is cleaned to remove oil stains; and S3, a CoCrW alloy powder layer is added to the surface of the base body through laser, and the CoCrW alloy powder layer comprises, by weight, 1.5%-3.0% of carbon, 0.5%-2.5% of silicon, 27.0%-33.0% of chromium, 0%-4.5% of iron, 1.0%-3.0% of nickel, 10.0%-15.0% of tungsten, 0.5%-2.2% of molybdenum, 0.2%-0.7% of manganese, 0.1%-0.2% of vanadium and the balance cobalt and inevitable impurities. Compared with the prior art, the CoCrW alloy has the advantages that the contents of chromium and tungsten are increased, and meanwhile, vanadium is added, so that the heat resistance, hardness and heat resistance of a coating can be effectively improved. According to the invention, the hardness of the piercing plug reaches 600HV, the friction coefficient at the high temperature (500 DEG C) is only 0.18, and the service life of the piercing plug is prolonged by 5 times from the original 100 to 500 compared with that of a plug without additional materials.

Description

technical field [0001] The invention relates to the technical field of seamless steel pipe processing, in particular to a method for manufacturing seamless steel pipe perforated plugs with laser additive materials. Background technique [0002] my country's seamless steel pipe production has continued to grow after more than ten years, but looking at the world, the resistance to acid, cold, high pressure, and CO 2 Such high-quality seamless steel pipes are still in short supply. The piercing plug is one of the most consumed key tools in the production of seamless steel pipes. During the piercing process, the piercing plug bears a huge axial force, compressive stress, shear stress and surface friction. In addition, the production conditions of different types of seamless steel pipes are different. Some plugs need to be water-cooled before being used after a piercing, while some do not need water cooling. Under the action of rapid cooling, rapid heating and rolling force, the...

AI Technical Summary

Problems solved by technology

20CrNi4, H13, 15Cr2Ni3MoW, high alloy A, and cobalt-containing high alloy are five typical alloy steel plug materials, but the piercing plug made of only a single material has large loss and high cost

However, the dilution effect of the matrix on the cladding powder has not been considered, and the service life of the perforated plug has not been improved. At present, the problem of high wear rate of the perforated plug cannot be solved.

[0005] To sum up, the existing perforated plug production technology cannot achieve significant improvement in terms of increasing the service life and reducing the wear rate. Therefore, there is an urgent need for a method that can greatly increase the service life of the perforated plug and improve the performance of the plug.