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plastic-coated steel pipe is a new type of pipeline material recently developed in china. it adopts a composite structure with a plastic-coated protective layer inside and outside, and a reinforced welded steel pipe or seamless pressure-bearing steel pipe in the middle, which overcomes the rust, corrosion, and corrosion of the steel pipe itself. the defects of high pollution, low strength, and easy deformation of plastic pipes integrate the common advantages of steel pipes and plastic products and are environmentally friendly products promoted and used by the state. plastic-coated steel pipe is to melt a layer of polyethylene (pe) resin, ethylene-acrylic acid copolymer (eaa), epoxy (ep) powder, non-toxic polypropylene (pp) or non-toxic the steel-plastic composite pipe made of poisonous polyvinyl chloride (pvc) and other organic substances not only has the advantages of high strength, easy connection, and water impact resistance of steel pipes, but also overcomes the corrosion, pollution, scaling, and plastic due to the shortcomings of low pipe strength and poor fire performance, the design life can reach 50 years. the main disadvantage is that it is not allowed to bend during installation, and when performing operations such as thermal processing and electric welding and cutting, the cutting surface should be painted with non-toxic room temperature curing glue provided by the manufacturer. the main specifications are φ15-φ300. to improve the corrosion resistance of steel pipes, general steel pipes are galvanized.
galvanized steel pipes are divided into two types: hot-dip galvanizing and electric galvanizing. the hot-dip galvanizing layer is thick, the cost of electric galvanizing is low, and the surface is not very smooth. oxygen-blowing welded pipe: used for steel-making oxygen-blowing pipe, generally small-diameter welded steel pipe, with eight types of specifications ranging from 3/8 to 2 inches. it is made of 08, 10, 15, 20, or 195-q235 steel strips, and some of them need to be aluminized for corrosion protection. most of the old houses used galvanized pipes. the iron pipes used for gas and heating are also galvanized pipes. galvanized pipes are used as water pipes. sanitary ware, mixed with bacteria that grow on the non-smooth inner wall, the rust causes the heavy metal content in the water to be too high, which seriously endangers human health. in the 1960s and 1970s, developed countries in the world began to develop new pipes and gradually banned galvanized pipes. four ministries and commissions, including the ministry of construction of china, has also issued a document stating that galvanized pipes will be banned from 2000. at present, galvanized pipes are rarely used in cold water pipes in newly built communities, and galvanized pipes are used in hot water pipes in some communities.