... the side. 1.The manufacturing process and whole operation. of seamless steel pipe smeltingingotrolled steel,cuttingpeelingperforationannealingpicklingtrowelingcold tensilecutting ... The features of seamless pipe: From the above process operation, we can easily find that: 1. the thicker ... steel, channel steel, PC steel bar, flat, bulb flat, coil steel, I-beam, H-beam, square tube, rectangular tube ...