1、Classified by production method
SMLS: seamless steel pipe
ERW: Resistance Welding
EFW: Electric Fusion Welding
SAW: Submerged Arc Welding (SAWL: longitudinal seam, SAWH: spiral seam)
2、Classified by material
Carbon steel pipe. Covering ordinary carbon steel pipe and high-quality carbon steel pipe.
Alloy steel pipe. It covers low alloy steel pipe and high alloy steel pipe, high alloy steel is also known as stainless steel.
3、Classified by pipe end connection
PE: flat end
BE: Beveled end
TE: Threaded end
NPT: National Pipe Thread
4、Classified according to pipe surface
Bare steel pipe
Hot-dip galvanized, 3LPE, FBE and other steel pipe cladding...
