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Brief introduction of Liangcheng steel-plastic composite pipe

Liangcheng steel-plastic composite pipe, which is based on seamless steel pipe and welded steel pipe, is coated with polyethylene powder coating or epoxy resin coating with high adhesion, anti-corrosion and food-grade sanitation on the inner wall. The water supply galvanized and plastic-coated composite steel pipe made by pre-treatment, preheating, internal coating, leveling and post-treatment process is an upgraded product of the traditional galvanized pipe, and the steel-plastic composite pipe is generally connected with threads.

Liangcheng steel-plastic composite pipe structure

Liangcheng steel-plastic composite pipe is a new type of composite pipe, which is referred to as steel-plastic pipe in many places. Steel is an iron material; Plastic refers to plastic. The plastic in steel-plastic composite pipe is generally high-density polyethylene (HDPE).

There are many types of steel-plastic composite pipes, which can be classified according to the structure of pipes: steel-plastic composite pipe reinforced by steel belt, steel-plastic composite pipe reinforced by seamless steel pipe, steel-plastic composite pipe reinforced by perforated steel belt and steel-plastic composite pipe with steel wire mesh framework. At present, the steel strip reinforced steel-plastic composite pipe, commonly known as steel-plastic composite pressure pipe, is popular in the market. The middle layer of this pipe is the steel strip layer formed by crimping and butt welding of high carbon steel strip, and the inner and outer layers are high density polyethylene (HDPE). The middle layer of this kind of pipe is steel strip, so the pressure bearing performance of the pipe is very good. Unlike the aluminum strip, which is not high, the maximum diameter of the pipe can only reach 63mm, and the maximum diameter of the steel-plastic pipe can reach 200mm, or even larger; Because the steel strip in the middle layer of the pipe is closed, the steel-plastic pipe has the function of oxygen resistance, and can be directly used in the direct drinking water project. The inner and outer layers are made of plastic materials, which has very good corrosion resistance. Such excellent performance makes the steel-plastic composite pipe widely used in oil and gas transmission, industrial and mining pipes, drinking water pipes, drainage pipes and other fields.

Liangcheng steel-plastic composite pipe product type

1. Liangcheng plastic-coated composite steel-plastic pipe

Liangcheng plastic-coated composite steel pipe is made of welded steel pipe and seamless steel pipe as the base material, and the inner and outer walls are coated with epoxy resin or polyethylene powder. It is a kind of anti-corrosion, corrosion-resistant, non-toxic and non-radiation green environmental protection pipe, which is used for various fluid transportation. The base pipe is longitudinally welded steel pipe, which shall meet the requirements of GB/T3091-2008 for the base pipe; If the base pipe is seamless steel pipe, it shall meet the requirements of GB/T8163-2008 for the base pipe; If the base pipe is spiral submerged arc welded steel pipe, it shall meet the requirements of SY/T5037-2000 for the base pipe.

The product has the following advantages:

1. It retains the rigidity and strength of traditional metal pipes, far superior to plastic pipes and aluminum-plastic pipes;

2. With the characteristics of smooth inner wall, small friction resistance and no scaling, the outer wall is more beautiful and luxurious;

3. Light weight, good toughness, impact resistance, high compressive strength; The applicable temperature is wider - 30 ℃~100 ℃;

4. The connection method with pipe fittings can adopt twisted wire, socket, flange, groove, welding, etc., which can save labor and labor in many ways;

5. The thermal expansion coefficient difference between the connection part and the pipe fittings is small, which is safer and more reliable;

6. The price performance ratio is reasonable, the comprehensive cost is low, and it is more economical than copper pipe and stainless steel pipe. The steel strip in the middle of the mesh steel strip is punched with many holes, which makes the PE of the inner and outer layers organically integrated, thus solving the composite problem of steel and plastic, but sacrificing the oxygen resistance of the steel-plastic pipe. Moreover, due to the existence of the mesh on the steel strip, the compressive strength of this type of steel-plastic pipe is greatly reduced. Under high pressure working conditions, the pipe is prone to local burst.

2. Liangcheng steel wire frame steel-plastic composite pipe

Liangcheng steel wire framework steel-plastic composite pipe is developed on the basis of hole-mesh steel belt steel-plastic pipe. Since hole-mesh steel belt has lost its high pressure resistance and oxygen resistance performance and only plays a part of the role of pressure bearing, why do you need such a difficult process as steel belt forming and butt welding? Simply wind the braided steel wire directly on the pipe wall, which can also play a role of pressure bearing, so the steel wire framework steel-plastic pipe also appears, The performance of this kind of pipe is basically similar to that of mesh steel strip steel plastic pipe.

Executive standard of Liangcheng steel-plastic composite pipe

● CJ/T120-2008 standard

● GB/T5135.20-2010 standard

● CJ/T136-2007 standard

● GB/T17219-1998 Health Standard