Hot-rolled seamless steel tube sub-normal, low, medium pressure boiler pipe, high pressure boiler pipe, steel pipe, stainless steel pipe, oil cracking pipe, geological steel pipes and other steel pipe. Cold-rolled (allocated) Subject to sub-general seamless steel pipe, low pressure boiler pipe, high pressure boiler pipe, steel pipe, stainless steel pipe, oil cracking pipe, the other steel, but also includes carbon thin-walled steel, alloy thin-walled steel pipe, walled stainless steel, special steel pipe. Hot-rolled seamless pipe diameter is generally greater than 32mm, wall thickness 2.5-200mm, cold-rolled seamless steel pipe at the path can go to 6mm, wall thickness can be 0.25mm, thin-walled tube diameter to 5mm wall thickness of less than 0.25mm, cold high dimensional accuracy than hot-rolled. General seamless steel pipes to ensure the strength and flattening test. Hot-rolled steel hot-rolled state or heat treatment delivery; cold to hot to heat treatment delivery.

Hot-rolled, high temperature, small deformation resistance, can achieve a large amount of deformation. Meanwhile, the generous plate is relatively small, the dimensional accuracy requirements are relatively low, not prone to flatness problem, mainly to control the crown. Requirements for the organization, usually by controlled rolling and cooling to achieve that control the opening and finishing rolling temperature, finish rolling temperature.