Method for manufacturing metallic pipe, and method for washing metallic pipe

A manufacturing method and technology of metal tubes, applied in metal extrusion cleaning equipment, cleaning methods using liquids, manufacturing tools, etc., can solve problems such as difficult to remove coatings, and achieve good cleaning effect
CN112805409APending Publication Date: 2021-05-14NIPPON STEEL CORP
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
NIPPON STEEL CORP
Publication Date
2021-05-14

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Abstract

In the washing of a metallic pipe having a chemical conversion coating film and a lubricant coating film both formed on the surface thereof, it is aimed to achieve both of energy saving (cost reduction) and good washability. A method for manufacturing a metallic pipe (P) comprises: a provision step (S1) of providing an original pipe made from a metal; a lubrication step (S2) of forming a chemical conversion coating film on the surface of the original pipe and then forming a lubricant coating film on the chemical conversion coating film; a cold drawing step (S3) of subjecting the original pipe having the chemical conversion coating film and the lubricant coating film formed thereon to a cold drawing work to form a metallic pipe (P) having a desired size; and a washing step (S4) of washing the metallic pipe (P) to remove the chemical conversion coating film and the lubricant coating film. The washing step (S4) comprises: a step (S41) of immersing the metallic pipe (P) in an alkaline defatted solution which is placed in an alkali washing vessel (11) and is not heated to a high temperature; and a step (S42) of irradiating a wash solution in an ultrasonic washing vessel (21) with ultrasonic waves and immersing the metallic pipe (P) that has been immersed in the alkaline defatted solution in the wash solution while generating fine bubbles in the wash solution.
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Description

technical field

[0001] The invention relates to a manufacturing method and a cleaning method of a metal pipe. In particular, the present invention relates to a method of cleaning a metal pipe formed by cold-drawing an elemental pipe having a chemical conversion coating and a lubricating coating formed on its surface. Background technique

[0002] When cold drawing is performed in the manufacturing process of a metal tube, a large frictional force is generated between the metal tube and the drawing tool. In order to reduce this frictional force, the tube blank is lubricated before cold drawing.

[0003] In the lubricating treatment before cold drawing, a chemical conversion coating such as a phosphate coating, an oxalate coating, or a chromate coating is formed on the surface of the shell. A lubricating coating is formed on the chemical conversion coating using a higher fatty acid salt (soap) or the like. The chemical conversion coating can prevent the direct contact betwe...

Claims

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