The difference and application of seamless steel pipe and spiral welded pipe

Seamless steel pipes are widely used. 1. General-purpose seamless steel pipes are rolled from ordinary carbon structural steel, low-alloy structural steel, or alloy structural steel, with the largest output, and are mainly used as pipes or structural parts for conveying fluids. 2. There are three types of supply according to different uses: a. Supply according to chemical composition and mechanical properties; b. Supply according to mechanical properties; c. Supply according to hydraulic test. Steel pipes supplied by Types A and B, if used to withstand liquid pressure, are also subject to hydrostatic testing. 3. There are many kinds of seamless pipes for special purposes, such as seamless pipes for boilers, seamless pipes for chemical power, seamless steel pipes for geological use, and seamless pipes for petroleum.

Seamless steel pipes have a hollow cross-section and are widely used as pipes for transporting fluids, such as pipes for transporting oil, natural gas, gas, water, and certain solid materials. Compared with solid steel such as round steel, the steel pipe is lighter in weight when the bending and torsional strength is the same, and it is an economical section of steel.

Widely used in the manufacture of structural parts and mechanical parts, such as oil drill pipes, automobile drive shafts, bicycle frames, and steel scaffolds used in construction, etc. Steel pipes are used to make ring parts, which can improve material utilization, simplify manufacturing processes, and save materials and processing Man-hours have been widely used to manufacture steel pipes.

Spiral welded pipes are mainly used in water supply projects, the petrochemical industry, the chemical industry, the electric power industry, agricultural irrigation, and urban construction in China. Used for liquid transportation: water supply and drainage. For gas transportation: gas, steam, liquefied petroleum gas. For structural purposes: as piling pipes, as bridges; pipes for wharves, roads, building structures, etc.