Comparison between Hot Rolled and Cold Rolled Pipe

Seamless steel tube in pipe insulation can be classified into two categories: hot-rolled seamless steel tube and cold-rolled seamless steel tube. Hot-rolled seamless steel tube has the following kinds: common steel tube, low-pressure boiler steel pipe, medium-pressure boiler steel pipe, high-pressure boiler tube, alloy steel pipe, stainless steel pipe, petroleum cracking pipe, geological steel pipe and other steel pipe, etc. Cold rolled steel pipe is classified into several categories: common steel pipe, low-pressure boiler steel pipe, medium-pressure boiler steel pipe, high-pressure boiler tube, alloy steel pipe, stainless steel pipe, oil cracking pipe, other steel pipe besides carbon thin-wall steel tube, alloy thin-wall steel pipe, thin-wall stainless steel tube, special-shaped steel tube.

 

Followed equipments may be used in the production of pipe insulation: steel pipe shot blasting derusting machine, three PE winding equipment, PE pipe winding equipment black yellow jacket drawbench, sandblasting derusting equipment, polyurethane low-pressure machine, foaming platform, glass reinforced plastics (GRP) winding machine, two PE coating, cement mortar spraying machine and other antiseptic heat preservation mated testing equipments.

 

Under external force, piping insulation might have adverse effects on performance in anti-corrosion, steel pipe deformation, stability, fatigue resistance, etc. In the processing of hot rolled steel products, it is not so easy to take control of the thickness and hem width of the pipes. Although the length and thickness of hot rolled steel pipe has reached the standard in the beginning of expansion and contraction, it must have minus tolerance at the end. The wider this minus tolerance of hem width is, the more obvious the thickness will be.