Coating for centrifugal casting high alloy furnace tube metal mould and method thereof

Abstract

The present invention is metal type paint for centrifugal casting high-alloy furnace tube and its production process. The material includes zirconite powder, silica sol, fluotrite powder, cellulose, PVA and bentonite; and the mixing production process includes dry mixing zirconite powder, fluotrite powder and bentonite inside a crushing roller mill for 15 min, dissolving cellulose and PVA in water and mixing and milling for 3 hr, and adding silica sol and mixing and milling for 30 min. The paint can form coating with increased low temperature strength, increased low temperature plasticity, raised flush resistance and vibration resistance.

Description

Technical field [0001] The present invention introduces a coating used in the production process of high-alloy conversion tubes, manifolds, and ethylene cracking tubes in the petrochemical industry. Specifically, it is a centrifugal casting high-alloy furnace tube metal mold coating and method. Background technique [0002] The high-alloy conversion tubes, manifolds, and ethylene cracking tubes used in my country's petrochemical industry; the support rods used in the roller tables of float glass annealing kilns in the building materials industry are all high-alloy furnace tubes produced by centrifugal casting technology. The tooling used in this production process is a metal mold centrifugal casting mold. Nearly 2000°C high-temperature molten steel is poured into the mold for cooling and forming, and then the formed furnace tube is ejected from the inner cavity of the mold. [0003] In several existing furnace tube factories in my country, most of the coatings used are impo...

AI Technical Summary

Problems solved by technology

[0004] 1) The high-temperature strength is low, because the adhesive used is water glass, which has the characteristics of high solidification temperature and fast speed during the spraying process, resulting in low strength after solidification of water glass, resulting in a decrease in the high-temperature strength of the coating;

[0005] 2) The surface quality of the furnace tube is poor. Due to the low-temperature expansion of water glass when it solidifies, the phase change of quartz powder occurs at high temperature, and there is also a phenomenon of volume expansion.

The superposition of these two volume expansion factors results in poor stability of the coating layer, resulting in a decline in the surface quality of the furnace tube;

[0006] 3) The collapsibility of the paint is poor. Due to the high residual strength of water glass and the lack of encrustation of this paint, there is sand sticking on the surface of the furnace tube;

[0007] 4), the price is high, and there is a certain storage period