CN109926451B - Reducing rate distribution method for sizing hot rolling process of seamless steel pipe - Google Patents
Reducing rate distribution method for sizing hot rolling process of seamless steel pipe Download PDFInfo
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- CN109926451B CN109926451B CN201910297618.1A CN201910297618A CN109926451B CN 109926451 B CN109926451 B CN 109926451B CN 201910297618 A CN201910297618 A CN 201910297618A CN 109926451 B CN109926451 B CN 109926451B
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Abstract
The invention discloses a reducing rate distribution method for a seamless steel pipe sizing hot rolling process, which is used for improving the wall thickness uniformity in the seamless steel pipe sizing hot rolling process. The method for distributing the reducing rate is characterized in that the reducing rate of the stable rolling unit is in wave fluctuation distribution along with rolling passes. The wavy distribution of the stable reducing ratio of the rolling unit is favorable for balancing the wall thickness deviation caused by single-pass rolling, so that the uniformity of the wall thickness of the seamless steel pipe is improved, and the defect of an inner polygon of the seamless steel pipe is reduced or even eliminated.
Description
Technical Field
The invention relates to the field of seamless steel pipe production, in particular to a reducing rate distribution method for a seamless steel pipe sizing hot rolling process.
Background
Sizing is the last process of hot rolling seamless steel pipes and is finished by continuous rolling of a sizing unit. After the seamless steel pipe is subjected to sizing rolling, the phenomenon of uneven wall thickness is easy to occur, and particularly for thick-wall pipes with the ratio of the wall thickness to the diameter larger than 0.2, the inner hole is usually polygonal. Among the many factors that contribute to this deficiency, the reduction ratio distribution of the sizing mill train is an important factor. At present, the reducing rate of a seamless steel pipe sizing unit in a stable rolling stage is usually a fixed value and is distributed in a horizontal straight line mode along with passes. Under the distribution mode, the wall thickness deviation generated by single-pass rolling is easy to accumulate and overlap in the subsequent-pass rolling, so that the internal polygon defect is generated.
Disclosure of Invention
In order to overcome the above problems, the present invention aims to provide a method for distributing the reduction ratio of a seamless steel tube sizing and rolling process, which is used for improving the uniformity of the wall thickness of the seamless steel tube in the sizing and hot rolling process, thereby reducing or even eliminating the inner polygon defect of the seamless steel tube.
In order to solve the technical problems, the invention adopts the following technical scheme: aiming at the sizing process of the seamless steel pipe, a reducing rate distribution method is designed, and is characterized in that the reducing rate of a sizing unit in a stable rolling stage is in wave fluctuation distribution along with rolling passes, and a reference line of the wave fluctuation is a horizontal straight line, or one or more sections of straight lines which are inclined downwards, or a curve which is monotonically decreased.
The invention has the beneficial effects that: for the sizing rolling process of the seamless steel pipe, the continuous fluctuation of the reducing rate of adjacent passes can effectively prevent the genetic accumulation of uneven wall thickness caused by single-pass rolling in the subsequent rolling process, thereby improving the wall thickness uniformity of the seamless steel pipe after sizing rolling and reducing or even eliminating the defect of an inner polygon of the steel pipe.
Drawings
FIG. 1 is a schematic view of the present invention;
FIG. 2 is a schematic view of another embodiment of the present invention.
Detailed Description
The invention will be further explained with reference to the drawings.
Fig. 1 is a schematic diagram of the invention, and the sizing mill train comprises 15 passes in total, wherein the 1 st and 2 nd passes are tension building stages, the 3 rd to 12 th passes are stabilizing rolling stages, and the 13 th, 14 th and 15 th passes are finishing stages. The reducing rate in the tension building stage shows a gradually increasing trend; the reducing rate in the stable rolling stage is in a wave shape, and the datum line of the reducing rate is a horizontal straight line; the reducing rate of the finished product is gradually reduced.
Fig. 2 is a schematic view of another embodiment of the present invention, the sizing mill train comprises 15 passes in total, wherein the 1 st and 2 nd passes are tension building stages, the 3 rd to 12 th passes are stabilizing rolling stages, and the 13 th, 14 th and 15 th passes are finishing stages. The reducing rate in the tension building stage shows a gradually increasing trend; the stable rolling stage presents a wavy shape, and the datum line of the stable rolling stage is a monotone decreasing curve; the reducing rate of the finished product gradually decreases.
Claims (1)
1. A method for distributing the reducing rate of the hot rolling process for sizing seamless steel tube features that the reducing rate of the sizing unit in the stable rolling stage is waved and waved along with the rolling pass, and the waved reference central line is a horizontal straight line, or a downward inclined straight line or curves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910297618.1A CN109926451B (en) | 2019-04-15 | 2019-04-15 | Reducing rate distribution method for sizing hot rolling process of seamless steel pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910297618.1A CN109926451B (en) | 2019-04-15 | 2019-04-15 | Reducing rate distribution method for sizing hot rolling process of seamless steel pipe |
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| Publication Number | Publication Date |
|---|---|
| CN109926451A CN109926451A (en) | 2019-06-25 |
| CN109926451B true CN109926451B (en) | 2020-07-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910297618.1A Active CN109926451B (en) | 2019-04-15 | 2019-04-15 | Reducing rate distribution method for sizing hot rolling process of seamless steel pipe |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113996663B (en) * | 2021-12-31 | 2022-03-11 | 太原科技大学 | Method and system for distributing and correcting reducing rate of seamless pipe tension reducing process |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3701272A (en) * | 1970-10-17 | 1972-10-31 | Nippon Kokan Kk | Method of manufacturing seamless steel pipes |
| CN1162508A (en) * | 1997-03-28 | 1997-10-22 | 宝山钢铁(集团)公司 | Method for designing roll passes of three roller extension diameter reducing apparatus |
| CN104550263A (en) * | 2014-12-18 | 2015-04-29 | 天津商业大学 | Pass design method for producing seamless steel tubes by utilizing five-rack continuous rolling mill |
| CN104874606A (en) * | 2015-06-16 | 2015-09-02 | 攀钢集团成都钢钒有限公司 | Production method of high-chromium ferrite stainless steel seamless pipe |
| CN107377668A (en) * | 2017-09-22 | 2017-11-24 | 攀钢集团研究院有限公司 | Production method for the pure titanium hollow forging sizings of TA2 |
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2019
- 2019-04-15 CN CN201910297618.1A patent/CN109926451B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3701272A (en) * | 1970-10-17 | 1972-10-31 | Nippon Kokan Kk | Method of manufacturing seamless steel pipes |
| CN1162508A (en) * | 1997-03-28 | 1997-10-22 | 宝山钢铁(集团)公司 | Method for designing roll passes of three roller extension diameter reducing apparatus |
| CN104550263A (en) * | 2014-12-18 | 2015-04-29 | 天津商业大学 | Pass design method for producing seamless steel tubes by utilizing five-rack continuous rolling mill |
| CN104874606A (en) * | 2015-06-16 | 2015-09-02 | 攀钢集团成都钢钒有限公司 | Production method of high-chromium ferrite stainless steel seamless pipe |
| CN107377668A (en) * | 2017-09-22 | 2017-11-24 | 攀钢集团研究院有限公司 | Production method for the pure titanium hollow forging sizings of TA2 |
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| CN109926451A (en) | 2019-06-25 |
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