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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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 18
- 238000004513 sizing Methods 0.000 title claims abstract description 18
- 239000010959 steel Substances 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000005098 hot rolling Methods 0.000 title claims abstract description 5
- 238000009826 distribution Methods 0.000 title abstract description 5
- 238000005096 rolling process Methods 0.000 claims abstract description 24
- 230000007547 defect Effects 0.000 abstract description 6
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000000087 stabilizing effect Effects 0.000 abstract 1
- 238000010276 construction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000003247 decreasing effect Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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Abstract
本发明公开了一种无缝钢管定径热轧工艺的减径率分配方法，用以提升无缝钢管定径热轧过程中的壁厚均匀性。所述减径率分配方法的特点在于稳定轧制机组减径率随轧制道次呈波浪起伏分布。通过稳定轧制机组减径率的波浪起伏形分配，有利于平衡单道次轧制时引起的壁厚偏差，从而提升无缝钢管的壁厚均匀性，减轻乃至消除无缝钢管的内多边形缺陷。
The invention discloses a method for distributing the diameter reduction ratio of a seamless steel pipe sizing hot rolling process, which is used to improve the uniformity of wall thickness in the seamless steel pipe sizing hot rolling process. The feature of the method for distributing the diameter reduction ratio is that the diameter reduction ratio of the stable rolling mill is undulating and distributed along with the rolling passes. By stabilizing the undulating distribution of the reduction rate of the rolling unit, it is beneficial to balance the wall thickness deviation caused by single-pass rolling, thereby improving the wall thickness uniformity of the seamless steel pipe and reducing or even eliminating the inner polygonal defects of the seamless steel pipe. .
Description
技术领域technical field
本发明涉及无缝钢管生产领域,具体涉及一种无缝钢管定径热轧工艺的减径率分配方法。The invention relates to the field of seamless steel pipe production, in particular to a method for distributing reduction ratios in a sizing hot rolling process for seamless steel pipes.
背景技术Background technique
定径是热轧无缝钢管的最后一道工艺，由定径机组进行连续轧制完成。无缝钢管在定径轧制后，容易出现壁厚不均现象，尤其对于壁厚与直径之比大于0.2的厚壁管，通常内孔为多边形缺陷。在此缺陷的众多影响因素中，定径轧制机组的减径率分配是一重要因素。目前，无缝钢管定径机组的稳定轧制阶段减径率通常为定值，其随道次呈水平直线式分布。此种分配方式下，单道次轧制产生的壁厚偏差容易在后续道次轧制中累积叠加，从而产生内多边形缺陷。Sizing is the last process of hot-rolled seamless steel pipe, which is completed by continuous rolling of the sizing unit. After sizing rolling, the seamless steel pipe is prone to uneven wall thickness, especially for thick-walled pipes with a ratio of wall thickness to diameter greater than 0.2, usually the inner hole is a polygonal defect. Among the many influencing factors of this defect, the reduction rate distribution of the sizing rolling mill is an important factor. At present, the reduction rate in the stable rolling stage of the seamless steel pipe sizing unit is usually a fixed value, which is distributed horizontally and linearly with the pass. Under this distribution method, the wall thickness deviation caused by single-pass rolling is easy to accumulate and superimpose in subsequent passes of rolling, resulting in inner polygonal defects.
发明内容SUMMARY OF THE INVENTION
为克服上述问题，本发明目的在于，提供一种无缝钢管定径轧制工艺的减径率分配方法，用以提升无缝钢管定径热轧过程中的壁厚均匀性，从而减轻乃至消除无缝钢管的内多边形缺陷。In order to overcome the above problems, the purpose of the present invention is to provide a method for distributing the reduction ratio of the sizing rolling process of the seamless steel pipe, so as to improve the uniformity of the wall thickness during the sizing rolling process of the seamless steel pipe, thereby reducing or even eliminating the Inner polygonal defects of seamless steel pipes.
为解决上述技术问题，本发明采用如下技术方案：针对无缝钢管定径工艺，设计了一种减径率分配方法，其特征在于，定径机组稳定轧制阶段的减径率随轧制道次呈波浪起伏分布，波浪起伏的基准线为一水平直线，或者为向下倾斜的一段或多段直线，或者为一单调递减的曲线。In order to solve the above-mentioned technical problems, the present invention adopts the following technical scheme: for the sizing process of the seamless steel pipe, a method for distributing the diameter reduction rate is designed. The second is undulating distribution, and the undulating reference line is a horizontal straight line, or one or more straight lines sloping downward, or a monotonically decreasing curve.
本发明的有益效果是：对于无缝钢管的定径轧制过程，相邻道次减径率的不断起伏可以有效防止单道次轧制引起的壁厚不均在后续轧制过程中遗传累积，从而改善定径轧制后无缝钢管的壁厚均匀性，减轻乃至消除钢管的内多边形缺陷。The beneficial effects of the invention are: for the sizing rolling process of the seamless steel pipe, the continuous fluctuation of the diameter reduction ratio of adjacent passes can effectively prevent the uneven wall thickness caused by single pass rolling from accumulating in the subsequent rolling process. , so as to improve the wall thickness uniformity of the seamless steel pipe after sizing rolling, and reduce or even eliminate the inner polygonal defects of the steel pipe.
附图说明Description of drawings
图1为本发明示意图；Fig. 1 is a schematic diagram of the present invention;
图2为本发明另一实施例示意图。FIG. 2 is a schematic diagram of another embodiment of the present invention.
具体实施方式Detailed ways
下面结合附图对本发明作进一步说明。The present invention will be further described below in conjunction with the accompanying drawings.
图1为本发明示意图，该定径轧制机组一共包括15道次，其中第1、2道次为建张阶段，第3-12道次为稳定轧制阶段，第13、14和15道次为成品阶段。建张阶段的减径率呈现逐渐增大趋势；稳定轧制阶段的减径率呈波浪起伏状，其基准线为一水平直线；成品阶段减径率呈逐渐减小趋势。Figure 1 is a schematic diagram of the present invention. The sizing rolling line includes a total of 15 passes, of which the first and second passes are the construction stage, the 3-12 passes are the stable rolling stage, and the 13th, 14th and 15th passes are The second is the finished product stage. The reduction rate in the construction stage shows a gradually increasing trend; the reduction rate in the stable rolling stage is undulating, and its baseline is a horizontal straight line; the reduction rate in the finished product stage shows a gradually decreasing trend.
图2为本发明另一实施例示意图，该定径轧制机组一共包括15道次，其中第1、2道次为建张阶段，第3-12道次为稳定轧制阶段，第13、14和15道次为成品阶段。建张阶段的减径率呈现逐渐增大趋势；稳定轧制阶段呈现波浪起伏状，其基准线为一单调递减的曲线；成品阶段减径率逐渐减小趋势。Fig. 2 is a schematic diagram of another embodiment of the present invention. The sizing rolling unit includes a total of 15 passes, of which the first and second passes are the construction stage, the 3-12 passes are the stable rolling stage, and the 13th, Passes 14 and 15 are the finished product stage. The reduction rate in the construction stage shows a gradually increasing trend; in the stable rolling stage, it is undulating, and its baseline is a monotonically decreasing curve; in the finished product stage, the reduction rate gradually decreases.
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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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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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