Core rod surface graphitic lubricant in rolling process of high-alloy steel pipe and preparation method

Abstract

The invention discloses a core rod surface graphitic lubricant in the rolling process of a high-alloy steel pipe and a preparation method, belonging to the field of high-alloy steel pipe rolling technology. The core rod surface graphitic lubricant consists of a composite adhesive, a film forming agent, a dispersing agent, an anti-foaming agent, a thickening agent, a mildew-proof agent, an emulsifier and water, wherein the solid phase accounts for 30-35% of the graphitic lubricant by mass, and water accounts for 65-70% by mass; and the solid phase comprises the following components in percentage by mass: 60-70% of graphite, 20-30% of compound adhesive, 3-5% of film forming agent, 0.5-2% of dispersing agent, 0.5-2% of anti-foaming agent, 0.5-2% of thickening agent, 0.5-2% of mildew-proof agent and 0.5-2% of emulsifier. The graphite is high-purity flaky graphite of which the purity is over 99% and the particle size is 200-600 meshes. Through the invention, the graphitic lubricant has good low-temperature film forming property as well as high high-temeprature adhesion and suspension dispersity; and moreover, the graphitic lubricant has moderate cost and high cost performance and is suitable for the popularization and application in the rolling process of high-alloy steel.

Description

technical field [0001] The invention belongs to the technical field of high-alloy steel pipe rolling, and in particular provides a graphite lubricant on the surface of mandrel rods in the high-alloy steel pipe rolling process and a preparation method thereof. Background technique [0002] In the production process of seamless steel pipe, the tube blank heated in the ring furnace is first perforated to make a hollow capillary tube, and then the capillary tube is sent to the continuous rolling mill to be inserted into the mandrel for rolling. Coating the graphite lubricant on the surface of the mandrel can reduce the friction coefficient when the mandrel type seamless steel pipe mill is stretched and rolled, improve the service life of the mandrel and reduce the generation of inner surface defects of the steel pipe. [0003] After the rolling starts, with the decomposition of organic matter and the combustion of graphite, a large amount of gas is generated, resulting in solid ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a graphite lubricant on the mandrel surface during the rolling of high-alloy steel pipes and a preparation method thereof, which solves the problems of high limit force and mandrel wear during the rolling of high-alloy steel, and improves the inner surface quality and quality of the steel pipes. Mandrel service life