Which is better seamless pipe or welded pipe?
Seamless pipe has better pressure capacity, strength is higher than ERW welded pipe. So it is widely applied in high pressure equipment, and thermal, boiler industries. Generally the welding seam of the welded steel pipe is the weak point, the quality affect overall performance. Seamless pipe vs welded steel pipe: 1. Appearance difference Seamless steel pipe used steel billet as raw material. The outer surface defects of billet cannot be eliminated by hot rolling process, it is only polished after the product finished. In the process of wall reduction, the defect can only get partially eliminated. Welded steel pipe made by hot rolled coil as raw material, the surface quality of coil is just the pipe’s surface quality, and easy to control.The surface of hot rolled coil have high quality. So Welded steel pipe surface quality is much better than seamless steel pipe. 2. Molding Process difference Seamless steel pipe can be formed one time in the rolling process. Welded steel pipe is m...