In our lives, no matter where we are, we can see steel-insulated steel pipes. However, everyone’s understanding of steel pipes is really narrow, and there is only one kind of steel pipe.In fact, there are two types of steel pipes used in our lives, namely, steel sleeve steel insulation steel pipes

Straight seam steel pipes are mainly used for fluid medium and petroleum and natural gas transmission pipelines, and their specifications are expressed by outer diameter + wall thickness. Straight seam steel pipe has single-sided welding and double-sided welding, and the welding process is divided i