Piercing plug and manufacturing method of piercing plug

Patent metadata

Field	Value
Publication number	US-10300513-B2
Application number	US-201314422692-A
Country	US
Kind code	B2
Filing date	Aug 1, 2013
Priority date	Aug 28, 2012
Publication date	May 28, 2019
Grant date	May 28, 2019

Abstract

A piercing plug includes a plug main body, and a sprayed coating which is formed on a surface of the plug main body and includes iron and iron oxide. A chemical composition of the sprayed coating includes, in addition to the iron and the iron oxide, by mass %, C: 0.015% to 0.6%, Si: 0.05% to 0.5%, Mn: 0.1% to 1.0%, and Cu: 0 to 0.3%.

First claim

The invention claimed is:

1. A piercing plug comprising:
a plug main body which is tapered off toward a tip; and
a sprayed coating which is formed on a surface of the plug main body, the sprayed coating consisting of the following chemical composition:
by mass %,
C: 0.015% to 0.6%,
Si: 0.05% to 0.5%,
Mn: 0.1% to 1.0%, and
Cu: 0 to 0.3%.
and a balance composed of iron, iron oxide, and impurities, at least one impurity selected from the group consisting of P, S, or O.

2. The piercing plug according to claim 1 ,
wherein a content of C in the chemical composition of the sprayed coating is 0.2% to 0. 6%.

3. The piercing plug according to claim 1 or 2 ,
wherein a content of Cu in the chemical composition of the sprayed coating is 0.05% to 0. 3%.

4. A manufacturing method of a piercing plug including a plug main body which is tapered off toward a tip, and a sprayed coating which is formed on a surface of the plug main body, the manufacturing method comprising:
a process of forming the sprayed coating on the surface of the plug main body by arc-spraying a steel wire rod on the surface of the plug main body,
wherein a chemical composition of the steel wire rod includes, by mass %,
C: 0.06% to 1.1%,
Si: 0.4% to 1.3%,
Mn: 0.2% to 2.0%,
Cu: 0 to 0.5%, and
Fe.

5. The manufacturing method of a piercing plug according to claim 4 ,
wherein a content of Cu in the chemical composition of the steel wire rod is 0.05% to 0.5%.

Assignees

• Nippon Steel & Sumitomo Metal Corp

Inventors

• Tatebayashi Yosuke
• Hidaka Yasuyoshi
• Higashida Yasuto
• Nakaike Kouji
• Inage Takateru

Classifications

• C22C38/02

  containing silicon · CPC title

• B23K9/044

  Built-up welding on three-dimensional surfaces · CPC title

• 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

• C22C38/04

  containing manganese · CPC title

• C23C4/12

  characterised by the method of spraying · CPC title