Steel-plastic composite pipes are a type of pipe that combines the strength of steel with the flexibility of plastic. They are used in a variety of applications, from plumbing to industrial piping. In order to ensure the quality of these pipes, they must be graded according to their strength and flexibility.

Grade 1 steel-plastic composite pipes are the strongest and most flexible of the grades. They are designed to withstand high pressures and temperatures, making them ideal for industrial applications. Grade 2 pipes are slightly less strong and flexible than Grade 1, but still offer excellent performance. They are suitable for a variety of applications, including plumbing and irrigation. Grade 3 pipes are the weakest and least flexible of the grades, but still offer good performance. They are suitable for low-pressure applications, such as drainage and water supply.

Steel-plastic composite pipes are a great choice for many applications due to their strength, flexibility, and durability. By understanding the different grades of these pipes, you can ensure that you are using the right type of pipe for your project.