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There are essential differences between porcelain lined pipes and traditional steel pipes, wear-resistant alloy main steel pipes, tin pipes, steel plastic pipes, steel rubber pipes, etc. The outer layer of ceramic steel pipe is steel pipe, and the inner layer is corundum. The Vickers hardness of the corundum layer is 100-1500 (Rockwell hardness is 90-98), which is equivalent to cobalt hard gold. The wear resistance is more than 20 times higher than that of carbon steel pipes, and the performance is much better than that of commonly bonded corundum grinding wheels. At present, corundum grinding wheel is still the main grinding wheel for various grinding machines. The corundum layer of ceramic steel pipes will wear away the corundum grinding wheel. The wear resistance of ceramic steel pipes is mainly due to the inner layer of a few millimeters thick corundum layer, with a hardness of 9, second only to diamond and silicon carbide, and having a high hardness among all oxides.
The ceramic lined pipe is made by self propagating high-temperature synthesis centrifugation method. The fused point of corundum in the ceramic steel pipe is 2045. Due to process reasons, the structure of the corundum layer and the steel layer are special, and the stress field is also special. The compressive stress of the ceramic layer at room temperature causes the steel layer to undergo tensile stress, and the two are opposed and unified, forming a balanced whole. The temperature only rises to over 400. Due to the different coefficient of thermal expansion of the two, the new stress field generated by thermal expansion and the stress field on the ceramic steel pipe cancel each other, so that the ceramic layer and the steel layer are in free equilibrium. When the temperature rises to 900, the ceramic lined wear-resistant steel pipe is immersed in water repeatedly for many times, and the composite layer will not break or rupture, showing the heat shock resistance that ordinary ceramics cannot match. This performance is very useful in engineering. Because the outer layer is made of steel, the temperature of the inner layer will not break. During construction, flanges, cleaning ports, explosion-proof doors, etc. can be welded and directly connected using welding methods. This is wear-resistant tin pipe, wear-resistant steel pipe, rare earth wear-resistant steel pipe, bimetal composite pipe, steel plastic pipe, ceramic lined wear-resistant steel pipe with good mechanical shock performance, and the composite layer will not break during transportation, installation knocking, and self weight bending deformation between two supports.
According to the practice of dozens of fossil-fuel power station at present, porcelain lined pipes have high wear resistance and strong resistance to fluid erosion. The elbow in the primary air duct is ground quickly, and the wear resistance of the lined ceramic wear-resistant steel pipe is more than 5 times higher than that of the thick walled wear-resistant cast steel.
In fact, after 1-2 years of observation and measurement, there was no significant wear or detachment of the composite layer on the porcelain lined tube. On pipelines of the same specification and unit length, the weight of lined ceramic pipes is only about half of that of wear-resistant cast steel pipes or bimetallic composite pipes, reducing the engineering cost per meter by 30% to 40%. The weight of tin pipes and rare earth wear-resistant steel pipes is only 2/. The price of ceramic lined wear-resistant steel pipes used in corrosive or high-temperature environments is only a fraction of that of stainless steel pipes and nickel titanium pipes. This type of fluid pipeline transportation is not only suitable for the power industry, but also for industries such as metallurgy, coal, petroleum, chemistry, building materials, machinery, etc. When transporting materials with high abrasiveness (such as ash, coal powder, mineral powder, tailings cement, etc.) in pipelines, there is a problem of rapid pipeline wear, especially the problem of rapid bend wear. When transporting highly corrosive gases, liquids, or solids from pipelines, pipeline corrosion can cause rapid damage. When transporting high-temperature materials through pipelines, the problem of using heat-resistant steel pipes being very expensive has been successfully solved in the market of porcelain lined pipes.

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