Plug for hot tube-making

Patent metadata

Field	Value
Publication number	US-9352370-B2
Application number	US-201314433154-A
Country	US
Kind code	B2
Filing date	Dec 16, 2013
Priority date	Jan 11, 2013
Publication date	May 31, 2016
Grant date	May 31, 2016

Abstract

A plug for hot tube-making includes: a plug main body; a build-up layer formed around an axis of the plug main body on a surface of the plug main body; and a sprayed coating formed on a surface of the build-up layer.

First claim

The invention claimed is:

1. A plug for hot tube-making, comprising:
a plug main body;
a build-up layer formed on a surface of the plug main body around an axis of the plug main body; and
a sprayed coating formed on a surface of the build-up layer;
wherein the surface of the plug main body includes:
a first surface region in which the build-up layer is to be formed; and
a second surface region provided behind the first surface region in the plug main body, and
wherein the sprayed coating includes:
a first sprayed region formed on the surface of the build-up layer; and
a second sprayed region formed on the second surface region.

2. The plug for hot tube-making according to claim 1 ,
wherein the second sprayed region is adjacent to the first sprayed region.

3. The plug for hot tube-making according to claim 1 ,
wherein the build-up layer coats a front end of the plug main body.

4. The plug for hot tube-making according to claim 1 ,
wherein the sprayed coating is formed by arc-spraying a steel wire rod.

5. The plug for hot tube-making according to claim 1 ,
wherein a thickness of the sprayed coating at a front end location of the plug main body is thicker than a thickness of the sprayed coating at a tapered surface location of the plug main body.

Assignees

• Nippon Steel & Sumitomo Metal Corp

Inventors

• Higashida Yasuto
• Hidaka Yasuyoshi

Classifications

• B21B25/00 Primary

  Mandrels for metal tube rolling mills, e.g. mandrels of the types used in the methods covered by group B21B17/00; Accessories or auxiliary means therefor {; Construction of, or alloys for, mandrels or plugs} · CPC title

• B23K10/027

  Welding for purposes other than joining, e.g. build-up welding · CPC title

• B23K2203/04

  Operations & Transport · mapped topic

• B21B17/02

  with mandrel, {i.e. the mandrel rod contacts the rolled tube over the rod length}(B21B17/08 takes precedence) · CPC title

• B23K9/046

  on surfaces of revolution · CPC title