... as petro chemistry, papermaking, nuclear energy, food, drink, medicine ect, where the pipe is required comparative high liquid medium.Seamless steel ... features of welded pipe: From the above process operation, we can easily find that: 1. The product is continually on-line production ... channel steel, PC steel bar, flat, bulb flat, coil steel, I-beam, H-beam, square tube, rectangular tube, L section steel ...