ChinaLarge diameter seamless steel pipeThe main production process is:Hot RolledLarge diameter seamless steel pipes and hot expanded seamless steel pipes.Hot-Expanded Seamless Steel PipeCan produce non-standard sizes.Hot Expansion Seamless PipeThat's what we commonly refer to as hot-expanded tube, a rough tube finishing process that uses slitting or drawing methods to expand the diameter of steel pipes with low density but high shrinkage.