New stainless steel squeeze tube glass lubricant

Abstract

The invention provides a novel glass lubricant of a stainless steel extruded tube. The lubricant is composed of three glasses of a novel glass formulation including exterior coating powder GW8, interior coating powder GN26 and a glass pad GD19 which are respectively acted on a roller coating or spraying coating phase, a broaching phase and an extrusion phase. Compared with the traditional like products, the lubricant provided by the invention has better protecting and lubricating properties. Through utilizing the product provided by the invention, the surface defects of the stainless steel are fewer and the grinding rate can be obviously reduced.

Description

technical field [0001] The invention relates to a novel glass lubricant, in particular to a glass lubricant for hot extrusion of stainless steel seamless steel pipes. Background technique [0002] Stainless steel extrusion is a method of metal thermoforming, which is carried out at a temperature above the recrystallization temperature. Stainless steel extrusion is to extrude a billet from a die hole to obtain a cross section in the shape of the die hole. Most stainless steel extrusions use glass as a lubricant, because grease and graphite are used as lubricants, which cannot meet the requirements of high temperature and high pressure resistance in the steel extrusion process, resulting in poor lubrication performance, many defects in extrusion products, and short die life. [0003] Since the glass lubricant has a certain viscosity and good heat insulation effect at high temperature, it can make the dry friction of the contact surface into boundary friction as much as possib...

AI Technical Summary

Problems solved by technology

The former melts quickly when in contact with the steel billet, that is, it has good instant meltability, and there are almost no high-hardness glass particles in the extrusion process, so naturally it will not cause scratches to the steel pipe, but due to its low viscosity, thick film lubrication will definitely occur. Effect, that is, "orange peel-like" stripes appear on the surface of the steel pipe, so the grinding rate is high and the required allowance is large; the latter will have a film lubrication effect due to its high viscosity, that is, the surface of the steel pipe is smooth and the color is bright, but it is generally instantaneous Poor performance, the unmelted glass particles in the extrusion process will cause scratches on the surface of the steel pipe, the same is the high grinding rate, and the required margin is large

[0005] It can be seen that for the third stage of extrusion, whether the glass viscosity is low or high, the surface quality of the steel pipe will be poor. Defects such as scratches, dotted lines, pinholes, groove scratches, etc., it is difficult to extrude and produce stainless steel pipes without grinding

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