Girth welded joint of steel pipe
US-2024353033-A1 · Oct 24, 2024 · US
Piercer Plug and Method of Manufacturing the Same
US2020263282A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2020263282-A1 |
| Application number | US-201816646739-A |
| Country | US |
| Kind code | A1 |
| Filing date | Aug 9, 2018 |
| Priority date | Nov 2, 2017 |
| Publication date | Aug 20, 2020 |
| Grant date | — |
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Abstract
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A piercer plug with increased recyclability is provided. A piercer plug ( 1 ) has a chemical composition of, in mass %: 0.15 to 0.30% C; 0.4 to 1.2% Si; 0.2 to 1.5% Mn; 0.1 to 2.0% Ni; 0 to 4.0% Mo and 0 to 4.0% W, where the total content of Mo and W is 1.0 to 6.0%; higher than 1.0% and not higher than 4.0% Cr; 0 to 0.2% B; 0 to 1.0% Nb; 0 to 1.0% V; 0 to 1.0% Ti; and balance Fe and impurities, the plug including a tip portion ( 2 ) and a trunk portion ( 3 ) made of the same material as the tip portion ( 2 ) and contiguous to the tip portion ( 2 ). The trunk portion ( 3 ) includes a cylindrical portion ( 5 ) having a hole used to mount a bar. The tip portion ( 2 ) is harder than the cylindrical portion ( 5 ).
First claim
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1 . A piercer plug having a chemical composition of, in mass %: 0.15 to 0.30% C; 0.4 to 1.2% Si; 0.2 to 1.5% Mn; 0.1 to 2.0% Ni; 0 to 4.0% Mo and 0 to 4.0% W, where a total content of Mo and W is 1.0 to 6.0%; higher than 1.0% and not higher than 4.0% Cr; 0 to 0.2% B; 0 to 1.0% Nb; 0 to 1.0% V; 0 to 1.0% Ti; and balance Fe and impurities, the plug comprising: a tip portion; and a trunk portion made of the same material as the tip portion and contiguous to the tip portion, the trunk portion including a cylindrical portion having a hole used to mount a bar, the tip portion being harder than the cylindrical portion. 2 . The piercer plug according to claim 1 , further comprising: a protective layer formed on a surface of the piercer plug, wherein the protective layer includes at least one of a sprayed coating and a build-up layer. 3 . A method of manufacturing a piercer plug, comprising the steps of: preparing a piercer plug having a chemical composition of, in mass %: 0.15 to 0.30% C; 0.4 to 1.2% Si; 0.2 to 1.5% Mn; 0.1 to 2.0% Ni; 0 to 4.0% Mo and 0 to 4.0% W, where a total content of Mo and W is 1.0 to 6.0%; higher than 1.0% and not higher than 4.0% Cr; 0 to 0.2% B; 0 to 1.0% Nb; 0 to 1.0% V; 0 to 1.0% Ti; and balance Fe and impurities, the plug including a tip portion and a trunk portion made of the same material as the tip portion and contiguous to the tip portion; and heating the piercer plug in such a manner that the tip portion is at a temperature not lower than an A C3 point and a cylindrical portion of the trunk portion having a hole used to mount a bar is at a temperature below the A C3 point. 4 . The method of manufacturing a piercer plug according to claim 3 , further comprising: before the step of heating, the step of forming a protective layer on a surface of the piercer plug, wherein the protective layer includes at least one of a sprayed coating and a build-up layer.
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- What does patent US2020263282A1 cover?
- A piercer plug with increased recyclability is provided. A piercer plug ( 1 ) has a chemical composition of, in mass %: 0.15 to 0.30% C; 0.4 to 1.2% Si; 0.2 to 1.5% Mn; 0.1 to 2.0% Ni; 0 to 4.0% Mo and 0 to 4.0% W, where the total content of Mo and W is 1.0 to 6.0%; higher than 1.0% and not higher than 4.0% Cr; 0 to 0.2% B; 0 to 1.0% Nb; 0 to 1.0% V; 0 to 1.0% Ti; and balance Fe and impurities,…
- Who is the assignee on this patent?
- Nippon Steel Corp
- What technology area does this patent fall under?
- Primary CPC classification C22C38/44. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Thu Aug 20 2020 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).