Graphite-oxide composite solid lubricant for hot-rolled seamless steel pipe and preparation method thereof

Abstract

The invention discloses a graphite-oxide composite solid lubricant for a hot-rolled seamless steel pipe and a preparation method thereof. The composite solid lubricant is mainly prepared by taking graphite, boric acid, serpentine, potassium titanate crystal whiskers and mica as main raw material and soluble silicate as adhesive agent by sufficiently stirring and mixing. The composite solid lubricant provided by the invention has high load-carrying capability, good frictional wear reduction performance and long wearing life, and overcomes the following frequently occurring problems of single-graphite solid lubricant: the vibration and noise are large, and the core rod is easy to adhere. During the application process, no noise is detected, the vibration of a rolling mill is small, the steel pipes and the core rods do not adhere, and the rod wrap accident is avoided. In addition, by using the composite solid lubricant, the steel pipe has smooth surface and is suitable for industrial production.

Description

technical field [0001] The invention relates to a solid lubricant for hot-rolled seamless steel pipes, in particular to a graphite-oxide composite solid lubricant for hot-rolled seamless steel pipes and a preparation method thereof. Background technique [0002] The hot-rolled seamless steel pipe relies on the plug to perforate the steel ingot, and then the inner diameter of the steel pipe is fixed by the mandrel. The plug and the mandrel work in a high temperature (1000-1200 ° C) and high pressure environment, and because they are in contact with the new surface of the steel pipe , The plug and mandrel are prone to adhesion, oxidation, wear and other phenomena, which seriously affect the quality and production efficiency of the steel pipe. The method of solid lubrication is usually used to improve the above phenomenon, that is, the solution of solid lubricant and adhesive is sprayed on the surface of the plug and mandrel. However, a steel pipe needs to be continuously roll...

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Problems solved by technology

However, a steel pipe needs to be continuously rolled through 7 to 11 rollers with different passes, and the mandrel passing through the steel pipe cannot receive new lubricant supplements. The solid lubricant on the surface of the rod will be elongated and thinned by strong extrusion under the high pressure of the roll, and the distribution in the circumferential direction is very uneven; on the other hand, graphite and other layers are often used in domestic hot-rolled seamless steel pipes The solid lubricant with a shape-like structure has the disadvantages that the use temperature is lower than 450°C, and it has already oxidized at the usual rolling temperature (1000-1200°C) and loses its lubricating performance, and the adhesion between graphite and steel pipe is not good. It is difficult to firmly adhere to the surface of the plug and mandrel, and the wear life is low. In addition, for stainless steel and some heat-resistant alloys, the use of graphite-type solid lubricants will also increase the carbon of the alloy and cause performance deterioration

In summary, there is no solid lubricant for hot-rolled seamless steel pipes with high load-carrying capacity, good friction and wear reduction performance, and long wear-resistant life in China.

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