Active Member
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Address: No.273, Siping Road, Shanghai, 200081, China
Contact name:Sum Xu
Sunny Steel Enterprise Ltd. |
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Large diameter ceramic lined pipe is the use of SHS high
temperature synthesis technology, that is, “SHS” technology
composite, is a national Low carbon steel pipe with ceramic with
conventional steel, wear-resistant alloy steel pipe, cast stone and
plastic pipe, steel pipe and other rubber have the essential
difference.
Ceramic pipe is steel outer and inner corundum. Corundum layer Vickers hardness 1100-1500 (Rockwell hardness of 90-98), the equivalent of tungsten-cobalt hard gold. High wear resistance than carbon steel pipe more than 20 times, it is much more superior than the usual bonding together corundum wheel performance. Now it is still a variety of corundum grinding wheels grinder cut hardened steel main wheel. Ceramic pipe corundum corundum wheel wear layer can be put away. Wear resistant ceramic pipe corundum layer may be formed mainly by a few millimetres thick, a Mohs hardness of 9, second only to diamond and silicon carbide, all oxides, which is the highest hardness. ¯Pipe and the component are only about 20% alumina, most of SiO2, SiO2 Mohs hardness of 7. Rare high chromium wear-resistant alloy tube or a Vickers hardness of about 400 (Rockwell hardness of about 50); lack of corundum hardness third. So wear-resistant alloy steel pipe, cast pipe wear both by composition and organization, but also by the thickness of the ceramic pipe abrasion resistance compared to them, has been a qualitative leap.
Low carbon steel pipe with ceramic is the use of SHS – centrifugal method of manufacturing the ceramic pipe corundum melting point 2045 ℃, corundum layer and the steel layer structure due to process special reasons, the stress field is also special. The ceramic layer at room temperature compressive stress, steel layer subjected to tensile stress, the two opposites, into a balanced whole. Only the temperature rises above 400 ℃, since the thermal expansion coefficient between the two, the new stress field generated by the thermal expansion of the ceramic pipe and the stress field in the presence of the original offset each other, so that both the ceramic layer and the steel layer is free equilibrium. When the temperature rises to 900 ℃ to ceramic-lined steel pipe into the water Ling, repeated immersion times, the composite layer does not crack or crack, showing the common ceramic unparalleled thermal shock resistance. This performance would be useful in engineering construction, because of its outer layer of steel, coupled with the inner temperature is not cracked in the construction of the flanges, the purge port, explosion doors can be welded directly to the welding method can also be used connection, than wear and cast stone pipe, wear resistant steel pipe, rare earth abrasion steel, bi-metal composite pipe, steel pipe, steel rubber pipe in construction can not easily welded or soldered better. Ceramic-lined steel pipe good resistance to mechanical shock resistance, while during transportation, installation and beat two weight bracket bent, not broken off the composite layer.
Low carbon steel pipe with ceramic with high wear resistance, anti-erosion ability of the fluid. In a windpipe, pipe wear fastest, ceramic-lined steel pipe elbow abrasion wear resistance than thick steel elbow increased more than five times. In practice, the use of ceramic-lined steel pipe 1-2 years after opening observe and measure, the composite layer no significant wear or fall off, the unit of the same size and length of the pipeline, the ceramic-lined steel pipe weighs only wear resistant steel pipe or bimetallic composite pipe is about 1/2, its construction cost is per meter 30-40% lower, only cast stone weight steel pipe and rare wearable 2/5 or so per meter lower than 20% of the project cost. Ceramic-lined steel pipe corrosion or high temperatures in use, its price is only stainless steel pipe, a fraction of the nickel-titanium tubes.
| Item | Index |
| Content of Alumina | ≥95% |
| Density | ≥3.5 g/cm3 |
| Rockwell Hardness | ≥80 HRA |
| Impact Strength | ≥850 Mpa |
| Bending Strength | ≥290MPa |
| Breaking Temper | ≥4.8MPa·m1/2 |
| Coefficient of Linear Thermal Expansion | 20W/m.K |
Self-propagating high temperature synthesis technology of corundum ceramic composite steel pipe is that is, "SHS" technology composite, is a national High-tech "863" project, is the original national metallurgical Industry Department, the Ministry of Electricity Project focused on the promotion of new products, the tube from within to outside by ceramic (corundum) layer, transition layer and steel layer composed of three parts.
Ceramic composite pipe due to corundum ceramic (a-AL2O3), Mohs hardness of 9.0 is equivalent to more than HRC90. Therefore, it has high wear resistance for abrasive media conveyed by industries such as metallurgy, electric power, mining, and coal. It has been confirmed by industrial operation that its wear life is ten times or even several ten times that of hardened steel.
SHS ceramic composite pipe is not like a convex spiral line on the inner surface of a seamless steel pipe because the inner surface is smooth and never corrodes. The inner surface roughness and clear water resistance characteristics of the relevant test units were tested. The smoothness of the inner surface was better than that of any metal pipe. The clear drag coefficient was 0.0193, which was slightly lower than the seamless pipe. Therefore, the tube has the characteristics of small running resistance and can reduce operating costs.
Since the steel ceramic layer is (a-AL2O3), it is a neutral characteristic. Therefore, it is resistant to acid and alkali and seawater corrosion, and it also has anti-scaling properties.
Due to the corundum ceramic (a-AL2O3), it is a single stable crystalline structure. Therefore, the composite pipe can operate normally in the long-term temperature range of -50--700°C. Material linear expansion coefficient of 6-8 × 10-6/0C, about 1/2 of the steel pipe. The material has good thermal stability.
Ceramic composite pipes are light weight and affordable. It is 50% lighter than the cast stone tube with the same inner diameter; it is 20-30% lighter than the wear-resistant alloy tube, and it has good wear resistance and corrosion resistance because of its long service life, thus supporting hanger costs, transportation costs, installation fees, and Reduce operating costs. Comparing the project budget of the design institute and construction unit with the actual project, the project cost is equivalent to the cast stone. Compared with the wear-resistant alloy pipe, the project cost is reduced by about 20%.
Because of its light weight and good welding performance. Therefore, welding, flanges, quick coupling, etc. can be adopted, and the construction and installation are convenient, and the installation cost can be reduced.
Ceramic steel pipe and traditional steel pipe, wear-resistant alloy cast steel pipe, cast stone pipe, as well as steel plastic, steel rubber pipe, etc. have essential differences. The outer layer of ceramic steel pipe is steel, and the inner is corundum. The Vickers hardness of corundum layer is as high as 100-1500 (Rockwell hardness is 90-98), which is equivalent to tungsten cobalt hard gold. The wear resistance is more than 20 times times higher than carbon steel pipe, it is superior to the corundum grinding wheel which is usually bonded. Now the corundum grinding wheel is still the main grinding wheel of the grinding mill. The corundum layer in the ceramic steel tube can wear away the corundum grinding wheel. The abrasion resistance of ceramic steel tube is mainly by the inner layer of several millimeters thick corundum layer, its Morse hardness is 9, second only to diamond and SIC, in all oxides, its hardness is the highest.
The inner liner ceramic wear-resisting steel pipe is made by SHS high temperature synthesis-centrifugal method, the melting point of corundum in ceramic steel pipe is 2045 ℃, the corundum layer and steel layer have special structure and stress field because of the process reason. Under normal temperature, the compressive stress of the ceramic layer, the tensile stress of the steel layer, the two opposites, into a balanced whole. Only when the temperature rises to more than 400 ℃, because the thermal expansion coefficient is different, the new stress field produced by the thermal expansion and the original stress field in the ceramic steel pipe cancel each other, so that both the ceramic layer and the steel layer are in a free equilibrium state. When the temperature rises to 900 ℃ the inner liner ceramic wear-resistant steel pipe into the water, repeatedly soaked repeatedly, the composite layer does not crack or cracking, showing the incomparable thermal shock resistance of ordinary ceramics. This performance is of great use in construction, because the outer layer is steel, in addition to heating the inner layer does not crack, in the construction, the flange, blowing, explosion-proof doors can be welded, but also can be directly welded to connect, which is more than wear-resistant cast stone pipe, wear-resistant cast steel pipe, Rare-earth wear-resistant steel pipe, bimetal composite pipe, steel pipe, Steel rubber pipe In the construction is not easy to weld or welding more than a chip. Internal liner ceramic Wear-resistant steel pipe resistance to mechanical impact is good, in transport, installation beat and the two support between the weight bending deformation, the composite layer does not break off.
At present, the practice of dozens of thermal power plants shows that the wear resistance of the inner-lined ceramic steel tube is high, and the resistance to fluid scouring is strong. In the first air duct, the bending pipe wear the most quickly, the wear resistance of the inner liner ceramic wear-resisting steel pipe is more than 5 times times higher than that of the thick wall wear-resisting cast steel elbow.
In practice, the inner liner ceramic wear-resistant steel pipe after 1-2 years to open observation and measurement, the composite layer has no obvious wear or fall off, in the same size and unit length of the pipeline, the internal liner ceramic wear-resistant steel tube weight only wear-resistant cast steel pipe or bimetal composite pipe of about 1/2, the cost of each of the meters reduced 30–40%, Only cast stone pipe and Rare-earth wear-resistant steel pipe weight of about 2/5, per meter project cost reduction of more than 20%. In the corrosive or high-temperature place to use the liner ceramic wear-resistant steel pipe, its price is only a stainless steel tube, nickel-titanium tube of a fraction of.
Fluid pipeline transportation is not only used in the power industry, but also in metallurgy, coal, petroleum, chemical, building materials, machinery and other industries. When the pipe is transported with large grinding material (such as ash residue, pulverized coal, mineral fine powder, tailings cement, etc., there is a problem of fast abrasion of pipe, especially the bending pipe wear fast; when conveying a strong corrosive gas, liquid or solid in the pipeline, there is a problem that the pipeline is corroded and destroyed quickly. When conveying the material with high temperature in the pipeline, there are some problems such as the price of heat-resisting steel pipe is very expensive. The internal liner ceramic wear-resistant steel pipe market, these problems are solved.
