Piercing plug

Patent metadata

Field	Value
Publication number	US-10150147-B2
Application number	US-201314409150-A
Country	US
Kind code	B2
Filing date	Jul 16, 2013
Priority date	Jul 20, 2012
Publication date	Dec 11, 2018
Grant date	Dec 11, 2018

Abstract

A piercing plug of the present invention includes: a plug body; a Ni—Cr layer formed on a surface of the plug body; and a sprayed coating formed on a surface of the Ni—Cr layer. The plug body contains, by mass %, 20 to 30% of Cr, 30 to 55% of Ni, 0.005 to 0.5% of C, 0.1 to 1.0% of Si, 0.2 to 1.5% of Mn, and at least one of Mo and W which satisfy a following conditional expression (A), and remainder including Fe and impurities.

1.5%≤Mo+0.5W≤8.5%  (A)

First claim

The invention claimed is:

1. A piercing plug comprising:
a plug body;
a Ni—Cr layer formed on a surface of the plug body, the Ni—Cr layer coming into contact with the plug body; and
a sprayed coating formed on a surface of the Ni—Cr layer,
wherein the plug body contains, by mass %, 20 to 30% of Cr, 30 to 50% of Ni, 0.005 to 0.5% of C, 0.1 to 1.0% of Si, 0.2 to 1.5% of Mn, and at least one of Mo and W which satisfy conditional expression (A): 1.5%≤Mo+0.5W≤8.5%, with a remainder including Fe and impurities.

2. The piercing plug according to claim 1 ,
wherein a heat treatment is performed at 850 to 1150° C. after the Ni—Cr layer and the sprayed coating are formed on the plug body.

3. The piercing plug according to claim 1 or 2 ,
wherein the sprayed coating contains iron and iron oxide.

4. The piercing plug according to claim 1 or claim 2 ,
wherein the sprayed coating is formed by arc-spraying a steel wire rod.

5. The piercing plug according to claim 1 or claim 2 ,
wherein a thickness of the Ni—Cr layer is 50 to 100 μm.

6. The piercing plug according to claim 3 ,
wherein the sprayed coating is formed by arc-spraying a steel wire rod.

7. The piercing plug according to claim 3 ,
wherein a thickness of the Ni—Cr layer is 50 to 100 μm.

8. The piercing plug according to claim 4 ,
wherein a thickness of the Ni—Cr layer is 50 to 100 μm.

9. The piercing plug according to claim 6 ,
wherein a thickness of the Ni—Cr layer is 50 to 100 μm.

Assignees

• Nippon Steel & Sumitomo Metal Corp

Inventors

• NOSAKA Atsushi
• Hidaka Yasuyoshi
• Higashida Yasuto
• OGATA Ryuutarou

Classifications

• C22C38/00

  Ferrous alloys, e.g. steel alloys (cast-iron alloys C22C37/00) · CPC title

• C23C28/021

  including at least one metal alloy layer · CPC title

• C22C30/00

  Alloys containing less than 50% by weight of each constituent · CPC title

• C22C19/05

  with chromium · CPC title

• C21D9/0068

  for particular articles not mentioned below · CPC title