Steel-plastic composite pipe, the product is based on seamless steel pipe and welded steel pipe, and the inner wall is coated with high-adhesion, anti-corrosion, food-grade hygienic polyethylene powder coating or epoxy resin coating. The galvanized inner plastic coated composite steel pipe made by pre-treatment, preheating, inner coating, leveling and post-treatment processes is an upgraded product of the traditional galvanized pipe, and the steel-plastic composite pipe is generally screwed.
There are many classifications of steel-plastic composites, which can be classified into the following types according to the structure of the pipes. The following follows the Hubei steel-plastic composite pipe manufacturers to understand:
Steel belt reinforced steel-plastic composite pipe, seamless steel pipe reinforced steel-plastic composite pipe, hole mesh steel strip steel-plastic composite pipe and steel mesh skeleton steel-plastic composite pipe.
At present, the most popular on the market is a steel-reinforced steel-plastic composite pipe, which is often referred to as a steel-plastic composite pressure pipe. The intermediate layer of the pipe is a steel strip layer formed by crimping butt welding of a high-carbon steel belt. The inner and outer layers are all high density polyethylene (HDPE). The middle layer of the pipe is steel belt, so the pressure bearing performance of the pipe is very good. Unlike the aluminum belt, the pressure is not high, the maximum diameter of the pipe can only be 63mm, and the maximum diameter of the steel pipe can be 200mm or even larger; Since the steel strip of the middle layer of the pipe is sealed, the steel-plastic pipe has the oxygen barrier effect and can be directly used for the direct drinking water project, and the inner and outer layers are made of plastic material, which has very good corrosion resistance. Such excellent performance makes the steel-plastic composite pipe widely used, and oil, natural gas transportation, industrial and mining pipes, drinking water pipes, drain pipes and the like can be seen in various fields.
The production process of steel strip reinforced steel-plastic composite pipe is complicated. The steel strip is different from the aluminum strip, and it has almost no flexibility. Therefore, the forming process of the steel strip is very demanding. Secondly, the steel strip is usually thicker than the aluminum strip and cannot be welded by the lap welding process. Only the butt welding process with extremely high precision can be used. Finally, even if the steel strip is processed into a steel pipe that completely meets the requirements, what kind of process can be used to make the steel strip and PE perfectly combined, and it becomes another problem in the manufacture of steel-plastic composite pipe. In 2003, the Ministry of Construction of the People's Republic of China introduced the CJ/T183-2003 "Steel-Plastic Composite Pressure Pipe Standard" (revised in 2008 to the CJ/T183-2008 standard).
Although the steel-reinforced steel-plastic composite pipe has advantages that other pipes cannot match, the complexity of its production process and the requirements for high-precision technology have made many pipe manufacturers discouraged. Therefore, there is a seamless steel pipe reinforced steel. The appearance of these types of pipes, such as composite pipes, steel mesh steel-plastic composite pipes and steel mesh skeleton steel-plastic composite pipes.