When using plastic-coated steel pipes, it is strictly forbidden to suddenly discount. Internal and external epoxy coated straight seam steel pipe Steel plastic pipe is a steel-plastic composite pipe made of welded steel pipe as the base material and using sandblasting chemical double pretreatment, preheating, internal and external coating, curing, post-treatment and other processes. It has excellent comprehensive properties, strong corrosion resistance and mechanical properties, good chemical stability and water resistance, and has the functions of drag reduction, anti-corrosion, compression resistance, antibacterial and so on. It is generally not constrained by the conveying medium, and the plastic coating layer has a strong bonding force with steel. Coating material: epoxy resin (EP) is suitable for working environment below 80 °C, steel pipe coating has extremely high adhesion, its coating hardness, good impact resistance, and good chemical corrosion resistance.  And some manufacturers of plastic coated pipes, because of their own production, although the environment in one aspect can meet the requirements, but in the other can not let themselves achieve, so naturally will let them in the use of the product has no adaptability, and in this case, will let users use above, or can not let the use of the extensiveness of the use of the above, and then in use, because of the wrong use, will make the life and performance of the product affected, so this point is also the user's use of the requirements, * requirements. Internal and external plastic coated steel pipe is based on steel pipe as the matrix, on the surface of the steel pipe treatment process, so that some corrosion-resistant, acid and alkali resistant chemical raw materials, through spraying, hot dip and other operations, and steel pipe for full mixing, the use of chemical raw materials resin coating, PE, EP, PE-X, etc., manufactured steel pipes, widely used in building water supply, natural gas, seawater transportation, sewerage, hot and cold circulating water systems and other anti-corrosion pipelines. Identify the quality of internal and external plastic coated steel pipes, if the user can understand the plastic coating process is much simpler, good internal and external plastic coated steel pipe manufacturing process, spraying, hot dip process, so that the surface quality of the plastic coated steel pipe is smoother. The user wants to test the thickness of the steel pipe, but also need to observe the adhesion of the steel pipe, bending test, impact test, etc., these inspection operations, the manufacturer will carry out the inspection before leaving the factory, the user buys the product, need to ask the manufacturer for these test reports. Now more and more new pipelines, the use of internal and external plastic coated steel pipes, this is because the use of internal and external plastic coated steel pipes, overcome the galvanized pipe easy to rust, water quality yellowing, accumulation of pipe diameter small, blockage, plastic pipe strength weak and other shortcomings, to prevent secondary pollution of water, maintain water quality. The above is the quality and production process problems that need to be paid attention to when using the internal and external plastic coated steel pipes, which is also the most important issue. Inner and outer epoxy coated straight seam steel pipe
　
Large-diameter internal and external plastic coated spiral welded pipe has excellent pressure-bearing performance and corrosion resistance. Excellent insulation and weather resistance, small coefficient of thermal expansion, smooth surface of non-shrinkage deformation, small friction coefficient, and should not breed microorganisms. The pipeline connection is simple, easy to install, easy to master, and easy to maintain, its plastic coating layer more effectively solves the corrosion of buried and acid, alkali and salt on metal pipelines, and the service life can reach more than 50 years. Plastic coated fire steel pipe, with steel pipe as the base pipe, the outer wall is coated with high adhesion, impact resistance, anti-corrosion and weather-resistant thermosetting powder coating, and the inner wall is coated with high adhesion, anti-corrosion, food-grade sanitary thermoplastic powder coating. Using sandblasting chemical double pretreatment, preheating, internal coating, external coating, curing, post-treatment and other processes, the water supply inside and outside coated composite steel pipe is a traditional steel-plastic pipe, galvanized pipe upgrade type of cost-effective products. The product has passed the professional certification of fire protection of chemical building materials testing center. Through the plastic coating and anti-corrosion of steel pipes or galvanized pipes, the problems of rust and scaling in the process of burying and water transmission of ordinary steel pipes are solved. The phenomenon of pipe blockage and spray blockage is eliminated, the service life of the pipeline is improved, and the service life of the plastic coated steel pipe is more than 50 years.
　
Large diameter internal and external plastic spiral welded pipe reasonable price Large diameter water feed inside and outside coated epoxy composite steel pipe coating surface smooth, beautiful, appearance color can be arbitrarily selected. Due to the smooth inner wall, it can prevent the growth of microorganisms, and the resistance of the conveying fluid is small, which can increase the flow rate and save energy. Therefore, the internal and external plastic coated composite steel pipes are mainly suitable for domestic drinking water supply pipelines, seawater pipelines, reclaimed water pipelines, chemical pipelines, buried pipelines and shipbuilding pipelines. It is also widely used now. Its performance can meet a variety of needs, and it is also used in many occasions. Some knowledge of its tightness and anti-corrosion needs to be well understood. Today we will take a look at the knowledge of sealing anti-corrosion problems of internal and external plastic coated composite steel pipe thread connection. Such knowledge is conducive to the purchase and use of internal and external plastic coated composite steel pipes in use. Features of internal and external plastic coated composite steel pipe: 1. Large-diameter plastic coated steel pipe is suitable for buried and humid environment, and can withstand high temperature and extremely low temperature. 2. No burrs, smooth pipe wall, not easy to scale, breeding microorganisms. 3、. Good pressure strength, * pressure up to 6Mpa. 4. It has excellent corrosion resistance. 5. Low water absorption, high mechanical strength, small friction coefficient, can achieve the purpose of long-term use, internal and external plastic straight seam steel pipe with steel pipe as the base pipe, using modified epoxy resin powder to coat its inner and outer walls of the pipeline. Its plastic coating layer has strong bonding force with steel, strong corrosion resistance, drag reduction, anti-corrosion, pressure resistance, antibacterial and other effects, and has good chemical stability and water resistance. It is generally not constrained by the conveying medium, and there is no worry about "running, running, leaking, cracking".