Steel Pipes is used for transmitting large fluid channels. It's also a lot of variety. Only by production methods Classification (1) Seamless -- Hot control of cold-rolled, cold-drawing Steel Pipes , the Steel Pipes , Top Steel Pipes (2) Pipes (a) Process pm -- arc welded Pipes , resistance welding (HF, LF), the gas Steel Pipes . Furnace Pipe (b) Wel...