Ceramic Lined Composite Steel Pipe (CLSP)

The ceramic steel unbent pipes, the ceramic steel bent pipes, reducers, three-path pipes, four-path pipes, multi-path pipes and others manufactured in our factory have been used in over 200 thermal power plants, more than 50 mines and the industries of coal, building materials, mechanism, petroleum and so on. For example, in the condition of hard abrasion, the ceramic steel unbent pipes have been used for several years. But, at present, there is no any ceramic steel unbent pipe has been worn through. Even the ceramic steel unbent pipes with hardest abrasion, their use life is 10 times longer than the cast stone bent pipes and wearable alloy steel bent pipes, 15 times longer than the toughened plastic bent pipes and toughened latex bent pipes.

The ceramic steel pipe has captured the market rapidly. Besides the high quality and the wonderful capability, it’s also because its capability price ratio is higher than other wearable, anti-abrasion & anti-hotness pipes. For the pipes with the same sizes, types and length, the weight of ceramic pipe is about 1/2 of the wearable cast alloy steel pipe’s, while the cost has reduced 10%~20% per meter; the weight of ceramic pipe is about 1/3 of the cast stone bent pipe’s, 1/2 of the cast stone unbent pipe’s. The cost per meter is equal to the unbent pipe’s, 5%~15% less than the bent pipe’s.

The liquid pipe transport has been widely used in the industries of electric power, metallurgy, coal, petroleum, chemical engineering, building materials, mechanism and so on. And it has developed rapidly. When transporting the materials with the harder abrasion (such as ash dregs, slag, coal powder, mining dregs, the rest mines, cement, etc), it will exit the problem that the abrasion of pipes is too rapid. Especially, the abrasion of bent pipes is greatly more rapid. When transporting the special abrasion materials or erosive materials, it will exit the problem that the damage of pipes is too rapid. When transporting the materials with comparatively high temperature, it will exit the problem that the anti-hot steel pipes are very expensive. Since the ceramic steel pipe has gone into the market, the above problems have been settled down easily. The ceramic steel pipes are widely used for the transporting of mining fillings, mining power, and the rest mines with hard abrasion; for the pipe lines of hardening slag, blast furnace dregs, steel-making red-clay, agglomerated whitewash, dust cleaning of steel & iron companies; for the pipe lines to transport powder, to clean dregs, to clean sulfides, to clean dust for the thermal power plants; for the transport pipe lines of green stock, clinker, cements, coal powder and collective dust in the industry of cement. The ceramic steel unbent pipes are also the ideal pipelines for transporting the materials with erosive matter.

Very different from the traditional production process, the use of self-propagating centrifugation technology to produce ceramic pipe has a unique organizational structure. Unique organization and determine its excellent overall performance. It is not only resistant to wear and has a high hardness and strength, and has a good resistance to mechanical shock and thermal shock properties.

Ceramic steel pipe with a traditional steel pipe, wear-resistant alloy steel pipe, cast stone pipe and steel plastic, steel oak tubes are essentially different. Ceramic steel pipe steel pipe outer layer and the inner layer is corundum. Corundum layer hardness up to HV1100-1400, equivalent to the tungsten-cobalt carbide, wear resistance is more than 20 times higher than the carbon steel pipe, it is far superior than the bonding usually made of corundum grinding wheel performance. Corundum grinding wheel is still all kinds of grinder grinding hardened steel grinding wheel. Ceramic steel pipe the corundum layer of corundum grinding wheel wear off. The wear resistant ceramic steel pipe rely mainly corundum layer of the inner layer a few millimeters thick, corundum Mohs hardness of 9, after diamond and silicon carbide, and its hardness is the highest in all oxide. Cast stone pipe components, only around 15% of corundum, most Sio2, Sio2 Mohs hardness of 7. High chromium or rare earth wear-resistant alloy pipe, the Vickers hardness of about 400, less than a third of the corundum hardness. Wear-resistant alloy steel pipe, cast stone pipes antiwear, both rely ingredients and the organization, and by the thickness of the ceramic steel pipe, abrasion resistance compared with them, has been a qualitative leap.

The melting point of corundum ceramic steel pipe for 2045 ℃, the corundum layer and the steel layer stress field due to the special structure of the process reasons, also special. Ceramic layers by the compressive stress at room temperature, the steel layer is subjected to tensile stress, both of unity of opposites into a balanced overall. Only the temperature is increased to above 400 ℃ new stress field due to both thermal expansion coefficient is not the same as the thermal expansion only to the ceramic steel pipe originally present in the stress field cancel each other, so that both the ceramic layer and the steel layer is in free equilibrium. When the temperature was elevated to 800 ℃, it is the maximum temperature reached of the composite when the mother tube, the ceramic steel pipe into the cold water, repeated several times, the ceramic layer is not cracks or chipping, showing the unparalleled thermal shock of the ordinary ceramic properties. This performance would be useful in the construction. Since the outer layer of steel, coupled with the inner layer of warming is not cracked, welding in the construction of the flanges, instrumentation mouth, purge port, explosion-proof door, also available directly welded pipe connections. Can use plasma cutting machine site cutting, wear-resistant alloy steel pipe, cast stone pipe and steel plastic, steel, oak pipe construction is not easy, not welding and cutting superior. High hardness material are usually relatively brittle damage is not usually wear out, wear it, but brittle fracture until failure. Corundum itself is hard and brittle, but it is formed and steel composite tube having an inner hard outer tough, hard but not brittle, and has a good resistance to mechanical impact properties. Weight in the transportation, installation, knock, as well as two brackets bending deformation, the corundum layer is not broken off. The CLSP physical and mechanical properties are shown in Table (physical and mechanical properties of ceramic steel pipe) and Table 2 (the ceramic steel thermal shock properties and resistance to mechanical shock performance).

Materials, data, projects	Hardness HV	Crushing strength	Proportion of	Compressive shear strength	Absolute roughness	Coefficient of linear expansion
ceramic steel pipe	1100-1400	350-400	4.6-4.7 containing buffer layer	15	DN ≤ 150 0.35 DN ≤ 150 0.35	8.5-9
20 # carbon steel pipe	149	411	7.85	/	new 0.05-0.1 Old 0.4-0.6	14-15

Note: seamless steel pipe thickness 8mm, strength ceramic layer and the buffer layer of the total thickness of 2.5-3.5mm, from the outside of the tube when the tube ceramic crushed. Second, when the ceramic steel pipe axial direction of the ceramic layer from the steel pipe inner pressure intensity; Third, the temperature range of -30-500 ° C;

materials	number of mechanical shock resistance	thermal shock cracks quenching water Views
		200 ℃	300 ℃	450 ℃	700 ℃	1000 ℃	1100 ℃
ceramic steel pipe	15 or more times	10 or more times	9 times	6 times	5 times	3 times	1 time small cracks and spalling
heat-resistant ceramic	1 times that is broken	2 times	1 times that is broken	1 times that is broken	1 times that is broken	1 times that is broken	1 times that is broken

Note: a ceramic steel pipe thick 9mm, mechanical energy 50J, point-contact tube tube ceramic layer to the impact of the number of cracks. Second, in each given temperature, heated for 5 minutes quenching water, and then heated and then quenched water;