Product performance
Steel skeleton composite pipe is a kind of pressure pipe, due to its unique structure determines the steel skeleton composite pipe has a set of steel and thermoplastic plastics are advantages of two kinds of materials in a body, also the decision of the steel skeleton composite pipe extrusion production line has superior performance characteristics. Product features & nbsp; & nbsp; & nbsp; steel skeleton composite pipe with anti-corrosion, non scaling, smooth low resistance, thermal insulation, does not produce wax, wear resistance, lightweight plastic pipe common features and the unique structure also contributed to the following characteristics: (1) the creep resistance can be good and the lasting mechanical strength is high.
Due to the plastic is under normal temperature and stress will creep, at higher lasting stress will occur in brittle fracture, so pure plastic pipe of the allowable stress and capacity is very low (typically less than 1.0MPa). And the mechanical strength of the steel is about about 10 times the thermal plastic and is very stable in the use of plastic temperature range not creep, the netted steel skeleton plastic composite and steel skeleton can be effectively constrained plastic creep, creep rupture strength of plastic itself greatly improve. So the allowable stress of the steel frame plastic composite pipe is more than that of the plastic pipe. (2) good temperature resistance. The strength of plastic pipe in its use temperature range generally decreases with the temperature, the temperature increases every 10 degrees and its strength decreases more than 10%. Since the strength of the steel skeleton plastic composite pipe is about 2/3, the strength of the steel frame is lower than that of any kind of pure plastic pipe.. The experimental results showed that the strength of the steel matrix plastic composite pipe was reduced at 5% below 10. (3) rigidity, impact resistance, good dimensional stability and moderate flexibility .
The elastic modulus of the hardness and softness of steel is usually about 200 times higher than that of the elastic modulus of high density polyethylene, due to steel skeleton strengthening action of steel skeleton plastic composite pipe rigidity, high impact resistance and dimensional stability is better than any a pure plastic pipe. At the same time, because the steel frame itself is a structure, so that the composite pipe also has some flexibility in the axial direction. Therefore, the pipe has rigid, flexible combination of the characteristics of loading and unloading, transportation, installation of adaptability and reliability of the operation is good. On the ground, the installation can save the number of bearings, the low cost, the underground installation can effectively with the sudden impact load due to the settlement, slip, vehicle. Small diameter tube can be appropriate, with the relief layout, saving pipe. (4) the coefficient of thermal expansion is small.
Due to the ordinary carbon steel wire expansion coefficient is 10.6-12.2× 10-6 (1 / C), pure plastic pipe line expansion coefficient for 170× 10 (1 / C), the steel skeleton plastic composite pipe under the constraint of negative net skeleton, the composite pipe thermal expansion of greatly improving, lower than any kind of commonly used plastic pipe. Through the test, the expansion coefficient of the steel skeleton plastic composite is 35.4-35.9× 10-6 (1/), is 3-3.4 times of plain carbon steel pipe. The results show that the buried installation can not generally do heat compensation device, the pipe can be absorbed (or released) by meandering type, so that the installation cost can be reduced.. (5) no rapid cracking occurs.
Plastic pipes especially large diameter plastic pipes at low temperature lasting ring to stress the role of, easy to produce by local defects, stress caused by rapid crack propagation (instant hundreds of meters even km above), so the plastic pipe anti - fast cracking performance of proposed very high requirements, and low carbon steel does not exist problem of brittle fracture, steel net exists so that the plastic deformation and stress will not reach to produce fast fracture critical point of elbow. So there is no quick cracking of steel frame plastic composite pipe in theory.. (6) steel, plastic two kinds of material composite uniform back by currently on the market because of steel plastic composite pipe, steel plastic composite surface is the interface between successive rules. The long-term use of alternating stress in the role of easy to take off, leading to leakage of the junction, the internal bottleneck contraction, blockage and failure. Compared with the steel skeleton plastic composite pipe is intertwined network structure and plastic seamless and composite surface area large and irregular, the two materials mutually binding and uniform, the stress concentration. (7) duplex anti-corrosion Steel skeleton composite pipe in the plastic, the inner surface and the outer surface of the pipe has the same corrosion resistance, wear resistance, and has a smooth inner wall small transmission resistance without fouling, wax, the energy-saving effect is obvious for geography and corrosive environmental conditions is very economical and convenient. (8) good tracer.Because of the existence of the steel frame, the buried in underground steel skeleton plastic composite pipe can be used normally magnetic detection method of locating, avoid damage caused by other mining projects. And this damage is pure plastic pipe and other non-metallic tube produced the most damage. (9) product structure performance adjustment is convenient and flexible ,Can through changing the wire diameter, pitch just, plastics layer thickness, different kinds of plastics to adjust product structure and performance, to meet the different pressure, temperature, corrosion requirements. (10) manufacturing costs are low, the performance price ratio is high, and the market competition is strengthened.
Material cost is the main body of the cost of pipe manufacturing, steel price is the plastic price of 1/3 or so, while steel skeleton plastic composite pipe wire and plastic