1. Welded steel pipes are produced continuously online. The thicker the wall thickness, the greater the investment in the unit and welding equipment, and the less economical and practical it is. The thinner the wall thickness, the corresponding decrease in its input-output ratio.2. The process of la

1. StrengthDeformation: The deformation of the material (steel pipe) is divided into two types: elastic deformation (the original shape can be restored when the external force is removed) and plastic deformation (the original shape cannot be restored when the external force is removed, and the shape

1. Petrochemical: Crude oil, refined oil, petrochemical raw material, finished product delivery pipes, and oilfield pipe network.2. Natural gas: submarine and onshore long-distance pipelines; gas pipelines at gas receiving stations; gas fields and urban natural gas pipeline networks.3. Coal: transpo

1. The fixed-length spiral steel pipe may not be bundled.2. If there are threaded buckles at both ends of the spiral steel pipe, it should be protected by a thread protector. Apply lubricating oil or anti-rust agent to the threaded fasteners. Both ends of the spiral steel pipe are breached, and nozz