High-temperature surface carbon retaining isolation agent for medium-high-carbon steel and application method of high-temperature surface carbon retaining isolation agent

Abstract

The invention relates to a high-temperature surface carbon retaining isolation agent for medium-high-carbon steel and an application method of the high-temperature surface carbon retaining isolation agent. The high-temperature surface carbon retaining isolation agent comprises components including, by weight percent, 60%-85% of diopside, 1%-5% of nano silicon nitride, 1%-5% of nano chromium carbide, 5%-15% of aluminum ash powder, 6%-25% of potash water glass and 0.1%-0.5% of polyacrylamide, wherein the granularity of the nano silicon nitride and the granularity of the nano chromium carbide are100-500 nm, and the added water volume accounts for 60%-90% of the total weight. The above components are evenly mixed according to a mechanical grinding and mixing method to prepare the isolation agent with the granularity smaller than 100 microns. The isolation agent is suitable for high-temperature protection when a steel blank is heated at the temperature of 900-1,150 DEG C for 1-10 h, the isolation agent is sprayed to the surface of the normal-temperature steel blank, the thickness of the isolation agent ranges from 200 microns to 500 microns, a glass base protection film is formed in the temperature rise process of the isolation agent, and carbon oxygen mutual permeation of the surface of the base body is protected. After the protected steel blank is heated, the isolation agent andthe steel blank surface scales can be completely removed through high-pressure water descaling, the isolation agent achieves the function of carbon retaining, the rolled material surface decarburization layer depth is effectively reduced, the rolled material surface quality is improved, and the usage cost is low.

Description

technical field [0001] The invention relates to a release agent, in particular to a release agent for maintaining carbon on the high-temperature surface of medium-high carbon steel and an application method thereof. Background technique [0002] During the heating process of medium-high carbon steel billet before rolling, the surface of the billet undergoes severe oxidation reaction at high temperature, resulting in the serious loss of carbon elements on the surface, which reduces the qualified product rate of rolled steel products. Generally speaking, decarbonization itself is less, but as the market has higher and higher requirements for low decarbonization of rolled products, there is no room for improvement and optimization of decarbonization in terms of production technology, which directly affects the level of my country's manufacturing industry and is a problem. A technical problem for the enterprise. Contents of the invention [0003] In order to overcome the above-...

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Problems solved by technology

[0002] During the heating process of medium-high carbon billet before rolling, the surface of the billet undergoes severe oxidation reaction at high temperature, resulting in the serious loss of carbon elements on the surface, which reduces the qualified product rate of rolled steel products. Generally speaking, decarbonization itself is less, but as the market has higher and higher requirements for low decarbonization of rolled products, there is no room for improvement and optimization of decarbonization in terms of production technology, which directly affects the level of my country's manufacturing industry and is a problem. A technical problem for enterprises