| 摘要 |
PURPOSE:To obtain the above coated steel pipe excellent in abrasion resistance, non-stickiness, self-lubricating properties and chemical resistance by laminating an inside coating layer to the inner surface of a steel pipe through an adhesive resin layer and using an ultrahigh mol.wt. polyethylene thin-walled pipe as the inside coating layer. CONSTITUTION:An ultrahigh mol.wt. polyethylene coated steel pipe has a steel pipe 1 and the inside coating layer 2 laminated to the inner surface of the steel pipe 1 through an adhesive resin layer 3 and the inside coating layer 2 is composed of an ultrahigh mol.wt. polyethylene thin-walled pipe which is composed of ultrahigh mol.wt. polyethylene with intrinsic viscosity of 5.0dl/g or more and characterized by that an outer diameter is 10mm or more, wall thickness is 0.1mm or more, a ratio of outer diameter/wall thickness is 10 or more and a shrinkage factor in a diameter direction at 100 deg.C is 5% or less. The coated steel pipe 1 and prepared by inserting the thin-walled pipe in the steel pipe 1 and expanding the pipe to bring the outer peripheral surface thereof to the inner surface of the steel pipe 1 through the adhesive resin layer 3 to bond the same. |
