Duct structure
US-2024229978-A1 · Jul 11, 2024 · US
Steel pipe, steel pipe structure, method of manufacturing steel pipe, and method of designing steel pipe
US10189065B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10189065-B2 |
| Application number | US-201615556368-A |
| Country | US |
| Kind code | B2 |
| Filing date | Mar 7, 2016 |
| Priority date | Mar 12, 2015 |
| Publication date | Jan 29, 2019 |
| Grant date | Jan 29, 2019 |
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- Title
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Abstract
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In a steel pipe having a waveform shape formed on an outer diameter thereof by a pipe expansion process, a value a/w is 0.038% or less, where a and w denote an amplitude and a wavelength of the waveform shape, respectively. A method of manufacturing a steel pipe having a waveform shape formed on an outer diameter thereof by a pipe expansion process includes a step of forming the waveform shape such that a value a/w is 0.038% or less, where a and w denote an amplitude and a wavelength of the waveform shape, respectively.
First claim
Opening claim text (preview).
The invention claimed is: 1. A steel pipe having a waveform shape formed on an outer diameter thereof by a pipe expansion process, wherein a value a/w is 0.038% or less, where a and w denote an amplitude and a wavelength of the waveform shape, respectively. 2. The steel pipe according to claim 1 , wherein a value w/λ defining a ratio of the wavelength w of the waveform shape to a Timoshenko's buckling wavelength λ is larger than 0.8. 3. A steel pipe structure comprising the steel pipe according to claim 1 . 4. A method of manufacturing a steel pipe having a waveform shape formed on an outer diameter thereof by a pipe expansion process, comprising a step of forming the waveform shape such that a value a/w is 0.038% or less, where a and w denote an amplitude and a wavelength of the waveform shape, respectively. 5. A method of designing a steel pipe having a waveform shape formed on an outer diameter thereof by a pipe expansion process, the method comprising: a step of evaluating, with respect to the steel pipe to be manufactured, a relationship between ratio w/λ and a buckling-time bending angle by using Equation (1), the ratio w/λ defining a ratio of a wavelength w of the waveform shape to a Timoshenko's buckling wavelength λ, and further determining the wavelength w and an amplitude a of the waveform shape, on a basis of a result of the evaluation: The buckling - time bending angle = ( D 1 + D 2 ) / 2 + ( D 1 - D 2 ) / 2 * tanh ( ( - X + α ) / β ) ( 1 ) where parameters “D1”, “D2”, “α”, and “β” have values determined by the outer diameter and a thickness of the steel pipe to be manufactured. 6. A steel pipe structure comprising the steel pipe according to claim 2 .
Assignees
Inventors
Classifications
- F16L9/006Primary
specially profiled (F16L9/003 takes precedence) · CPC title
Finishing tubes, e.g. sizing, burnishing · CPC title
Making tubes by soldering or welding · CPC title
of metal (F16L9/16 - F16L9/22 take precedence) · CPC title
- B21C37/16Primary
Making tubes with varying diameter in longitudinal direction · CPC title
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- What does patent US10189065B2 cover?
- In a steel pipe having a waveform shape formed on an outer diameter thereof by a pipe expansion process, a value a/w is 0.038% or less, where a and w denote an amplitude and a wavelength of the waveform shape, respectively. A method of manufacturing a steel pipe having a waveform shape formed on an outer diameter thereof by a pipe expansion process includes a step of forming the waveform shape …
- Who is the assignee on this patent?
- Jfe Steel Corp
- What technology area does this patent fall under?
- Primary CPC classification F16L9/006. Mapped technology areas include Mechanical Engineering.
- When was this patent published?
- Publication date Tue Jan 29 2019 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 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).