Plug for rolling of seamless steel pipe, method for manufacturing the same and method for manufacturing seamless steel pipe using the same
US-2015217349-A1 · Aug 6, 2015 · US
Piercer plug and method of manufacturing the same
US11331703B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11331703-B2 |
| Application number | US-201615762821-A |
| Country | US |
| Kind code | B2 |
| Filing date | Aug 12, 2016 |
| Priority date | Sep 25, 2015 |
| Publication date | May 17, 2022 |
| Grant date | May 17, 2022 |
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- Title
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- Abstract
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Abstract
Official abstract text for this publication.
A piercer plug with increased life and a method of manufacturing it are provided. The piercer plug 1 includes a tip portion 2 and a trunk portion 3 made of the same material as the tip portion 2 and continuous to the tip portion 2. The trunk portion 3 includes a cylindrical portion 5 having a hole used for attaching a bar. The tip portion 2 is harder than the cylindrical portion 5.
First claim
Opening claim text (preview).
The invention claimed is: 1. A method of manufacturing a piercer plug, the method comprising: heating a piercer plug, the plug including a tip portion and a trunk portion made of the same material as the tip portion and continuous to the tip portion, such that a temperature of the tip portion is not lower than an austenite transformation temperature, and a temperature of a cylindrical portion included in the trunk portion and having a hole used for attaching a bar is lower than the austenite transformation temperature; cooling the piercer plug to a temperature not higher than 400° C. at a cooling rate not lower than a cooling rate achieved by leaving the piercer plug to cool such that it provides the piercer plug with: a Vickers hardness for the tip portion not lower than 300 Hv and not higher than 380 Hv a Vickers hardness for the cylindrical portion of 220 Hv or less, and an impact value for the cylindrical portion at 20° C. of 20 J/cm 2 or higher in a Charpy impact test using a full-size test specimen based on JIS Z 2242 (2005); and forming a coating on a surface of the piercer plug before the heating.
Assignees
Inventors
Classifications
- C21D6/004Primary
containing Cr and Ni · CPC title
for particular articles not mentioned below · CPC title
with copper · CPC title
containing Co · CPC title
containing silicon · CPC title
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Frequently asked questions
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- What does patent US11331703B2 cover?
- A piercer plug with increased life and a method of manufacturing it are provided. The piercer plug 1 includes a tip portion 2 and a trunk portion 3 made of the same material as the tip portion 2 and continuous to the tip portion 2. The trunk portion 3 includes a cylindrical portion 5 having a hole used for attaching a bar. The tip portion 2 is harder than the cylindrical portion 5.
- Who is the assignee on this patent?
- Nippon Steel & Sumitomo Metal Corp, Nippon Steel Corp
- What technology area does this patent fall under?
- Primary CPC classification C21D6/004. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue May 17 2022 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).