Process for production of steel tube having polyolefin-coated inside surface

Provided is a process for the production of a steel tube of which the inside surface is coated with a polyolefin, in which the polyolefin tube on the inside surface rarely peels off even in an environment where freezing and thawing occur repeatedly or in a case where the steel tube is always filled...

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Bibliographische Detailangaben
Hauptverfasser:	MIMURA HIROYUKI, SATOH TETSU, FUNATSU SHINICHI, KARIYAZONO YOSHIHISA
Format:	Patent
Sprache:	chi ; eng
Schlagworte:	ALLOYS APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL BLASTING CHEMISTRY DRESSING OR CONDITIONING OF ABRADING SURFACES ENGINEERING ELEMENTS AND UNITS FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS FERROUS OR NON-FERROUS ALLOYS GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS GRINDING HEATING JOINTS OR FITTINGS FOR PIPES LIGHTING MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING MEANS FOR THERMAL INSULATION IN GENERAL MECHANICAL ENGINEERING METALLURGY PERFORMING OPERATIONS PIPES POLISHING PROCESSES FOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TOSURFACES, IN GENERAL SPRAYING OR ATOMISING IN GENERAL SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING THERMAL INSULATION IN GENERAL TOOLS FOR GRINDING, BUFFING, OR SHARPENING TRANSPORTING TREATMENT OF ALLOYS OR NON-FERROUS METALS WEAPONS
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Beschreibung
Zusammenfassung:	Provided is a process for the production of a steel tube of which the inside surface is coated with a polyolefin, in which the polyolefin tube on the inside surface rarely peels off even in an environment where freezing and thawing occur repeatedly or in a case where the steel tube is always filled with warm water, and which is also excellent in water-resistant adhesion. A process for the production of a steel tube of which the inside surface is coated with a polyolefin, which comprises subjecting a hot-dip zinc-plated steel tube, of which the inside and outside surfaces are plated with zinc by hot dipping, to grinding of the plating layer covering the inside surface with a steel wire brush to expose an iron-zinc alloy layer containing at least 6mass % of Fe, and then coating the resulting inside surface with a polyolefin, characterized in that the wire brush has a cylinder-like shape and is provided with steel wires arranged in radial directions radiately from the central axis of the cylinder and that the wi