recycled plastic granule is widely used in the development of plastic instead of steel. In the 21st century, there has been a revolutionary progress, that is, we just said to plastic instead of steel. Plastics were constantly replacing steel. At first, due to the backward production process, plastic was only seen as a substitute for steel. But as the performance of plastic pipes becomes more and more superior, plastic is no longer a substitute for steel. Plastic and steel belong to two different fields. Even in many ways, polyethylene pipe is far superior to steel.