CN102240677B - Method for solving indentation of salix-leaf-shaped iron sheet on surface of hot continuous rolling strip steel - Google Patents
Method for solving indentation of salix-leaf-shaped iron sheet on surface of hot continuous rolling strip steel Download PDFInfo
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- CN102240677B CN102240677B CN 201110123442 CN201110123442A CN102240677B CN 102240677 B CN102240677 B CN 102240677B CN 201110123442 CN201110123442 CN 201110123442 CN 201110123442 A CN201110123442 A CN 201110123442A CN 102240677 B CN102240677 B CN 102240677B
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Abstract
The invention relates to a method for solving the indentation of a salix-leaf-shaped iron sheet on a surface of a hot continuous rolling strip steel and belongs to the technical field of steel rolling. The method comprises the following technological processes of: macroscopically measuring the length-width ratio of a defect of the salix-leaft-shaped iron sheet, calculating a region having the defect; and microcosmically detecting the content of elements in the defect by utilizing a scanning electronic microscope and energy spectrum analysis, and determining the cause of the defect. After the cause of the defect is determined by analysis on the defect macroscopically and microcosmically, the following measures are adopted: a steel rolling plan is fully and reasonably transited during arrangement, a reasonable position is arranged in a rolling period, finishing roll stripping-preventing water of front ten steel blocks is opened 3-10 seconds later after a roll is replaced; and cooling water among front three racks is opened, and the inlet cooling water opening amount is 30-70% in 1, 2, 3 gate of the finishing roll mill, and the outlet cooling water opening amount is 10-50%. The method provided by the invention has the advantages that the existing equipment and technological process are utilized in a hot rolling process, technological parameter adjustment and control measures are adopted to eliminate the defect, and the surface quality and yield of hot rolled strip steel are improved. The method ensures no investment and production cost is increased, is simple and has the advantages of strong applicability and obvious effect.
Description
Technical field
The invention belongs to technical field of steel rolling, particularly relate to a kind of method that hot-continuous-rolling strip steel surface willow leaf shape iron sheet is pressed into that solves, be applicable to that (ReL 〉=350MPa) the willow leaf shape iron sheet with thin specification (thickness is less than 3.0mm) belt steel surface is pressed into the elimination high-strength steel.
Background technology
Along with society progressively enters the low-carbon (LC) life, subtracting to lower consumption becomes an important responsibility of all trades and professions, a trend of development is strengthened and become gradually with Bao Daihou to the height of ferrous materials, but because this series products roll-force in the hot continuous rolling process is big, the roller surface oxide-film is easy to peel off, the iron scale that peels off is easy to cause being pressed into of iron sheet, and such defective becomes the high-strength thin size hot-rolled product quality of influence at present, causes one of principal element of user quality objection.
For iron scale class defective, there is de-scaling not good from the origin cause of formation, the roll surface deterioration, board briquette is crossed high reason, from form the willow leaf shape is arranged, and is wavy, textured, landscape painting shape, forms such as loose sand shape, on generation area, may be that stove is given birth to, the interval generation of roughing, the interval generation of finish rolling, batch operations such as back generation, the iron sheet defective is that a kind of origin cause of formation is various for this reason, comes in every shape the class defective that operation is tediously long.
Willow leaf shape iron sheet is that iron sheet is pressed into a modal class pattern in the defective, and it is lobate that this defective is the two ends point of symmetry, is made up of some broken fritters in the defective, and this fritter mostly is grey black, and this defect distribution is random, belongs to comprehensive scattered distribution.For the origin cause of formation of this class defective, still there is not unified understanding, so there is not the scheme of clearly eliminating such defective yet.
The present inventor is through macroscopic observation and micro-analysis to such defective, think that such defective generation has two kinds of situations, one class is that de-scaling is clean and iron sheet that cause is pressed into, and another kind of is a kind of being pressed into behind the spalling of oxide film that causes owing to roll roll surface poor quality.
Summary of the invention
The purpose of this invention is to provide a kind of method that hot-continuous-rolling strip steel surface willow leaf shape iron sheet is pressed into that solves, in course of hot rolling, utilize existing equipment and technological process, eliminate hot-continuous-rolling strip steel surface willow leaf shape iron sheet defective by technological parameter adjustment and control device, improve hot-strip surface quality and lumber recovery.This method does not increase investment and production cost, and simple, applicability is strong, and effect is remarkable.
Technology of the present invention is as follows:
1, the macro morphology of defective is measured, measured length-width ratio, according to slab, intermediate blank, and elongation and spread ratio during rolling the depressing of each passage when rolling calculate the interval that this defective takes place.
2, get the metallographic specimen that has this defective, the pattern and the element that utilize ESEM and energy disperse spectroscopy to observe defective locations distribute, if there is Cr in this defective locations, roll dvielements such as Ni, then explanation has the iron sheet behind the spalling of oxide film to be pressed into, if no, then explanation is that the unclean iron sheet of de-scaling is pressed into.
3, adjacent slab finished product thickness is beated control within ± 0.5mm during rolling scaduled layout, and need arrange the transition base at the steel plate of rolling 1.6-3.0mm thickness, and each type transition base quantity control is at the 3-10 piece.
4, arrange rolling milimeter number rolling in 5-30km for the steel plate of 1.6-3.0mm.
5, the 1st～10 block plate behind the finish rolling mill roll, the 1st, 2,3 breast roller cooling waters are opened in 3～10s after roll is stung steel plate, make that the oxide-film of roller surface is finer and close and incrust.
6, the 1st, 2 of the finish rolling milling train the, 3 passage finish rolling entrance cooling water open amounts 30～70%, outlet cooling water open amount 10～50%.
The invention has the advantages that: only by the reasonable adjustment of technology, the surperficial willow leaf shape iron sheet that has solved high-strength steel and thin specification steel is pressed into defective, and method is simple, and is quick, efficient.
Description of drawings
Fig. 1 is pressed into the defective macro morphology for willow leaf shape iron sheet.
Microscopic appearance and distribution diagram of element that Fig. 2 is pressed into for willow leaf shape iron sheet.
The specific embodiment
Utilize involved in the present invention to method and control device move steel 2250mm six frame hot continuous rolling production lines at Shoudu Iron and Steel Co and carried out SPAH, M3A22, these three kinds of SEC440 easily go out the rolling of high-strength steel that willow leaf shape iron sheet is pressed into, and rolling specs is 2.5 * 1275mm and 2.0 * 1275mm.
Table 1 main points of processes control, ℃
1. this is rolling, carries out transition according to 3.5,3.0,2.5,2.0mm on the thickness, and the transition base is arranged 5 at every turn, and these these rolling three steel grades all are arranged in the 5-30km;
2. these 150 slab rollings have been arranged three roll changes altogether, roll change back 10 block plates, and the cold rolling water of roll gap postpones to open, and opens in the 5s after stinging steel plate;
3. for this trial-production, open F1, F2, cooling water between the F3 frame, entrance cooling water open amount 50%, outlet cooling water open amount 30%.
4, utilize the surface quality monitoring system to this 150 belt steel surface piece pieces inspection, surface quality control is good, finds no any unusual part.
Claims (1)
1. one kind solves the method that hot-continuous-rolling strip steel surface willow leaf shape iron sheet is pressed into, and it is characterized in that technology is as follows:
(1) macro morphology of defective is measured, measured length-width ratio, according to slab, intermediate blank, and elongation and spread ratio during rolling the depressing of each passage when rolling calculate the interval that this defective takes place;
(2) get the sample of defective locations, the pattern and the element that utilize ESEM and energy disperse spectroscopy to observe defective locations distribute, when there is Cr in this defective locations, Ni roll dvielement, then explanation has the iron sheet behind the spalling of oxide film to be pressed into, when there is not Cr in this defective locations, Ni roll dvielement, then explanation just the unclean iron sheet of de-scaling be pressed into;
(3) during steel rolling during rolling scaduled layout adjacent slab finished product thickness beat control within ± 0.5mm, and need arrange the transition base at the steel plate of rolling 1.6-3.0mm thickness, each type transition base quantity control is at the 3-10 piece;
(4) it is rolling in 5-30km to be arranged in rolling milimeter number for the sheet material of 1.6-3.0mm;
(5) the 1st～10 block of plate behind the finish rolling mill roll, the 1st, 2,3 breast roller cooling waters are opened in 3～10s after roll is stung steel plate, make that the oxide-film of roller surface is finer and close and incrust;
(6) the finish rolling milling train the 1st, 2,3 passage finish rolling entrance cooling water open amounts 30～70%, outlet cooling water open amount 10～50%.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110123442 CN102240677B (en) | 2011-05-13 | 2011-05-13 | Method for solving indentation of salix-leaf-shaped iron sheet on surface of hot continuous rolling strip steel |
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| CN 201110123442 CN102240677B (en) | 2011-05-13 | 2011-05-13 | Method for solving indentation of salix-leaf-shaped iron sheet on surface of hot continuous rolling strip steel |
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| CN102240677A CN102240677A (en) | 2011-11-16 |
| CN102240677B true CN102240677B (en) | 2013-07-17 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102989785B (en) * | 2012-12-17 | 2015-01-14 | 济钢集团有限公司 | Process for controlling surface piebaldness of steel plates |
| CN108517464B (en) * | 2018-05-15 | 2020-05-26 | 首钢集团有限公司 | Method for eliminating surface needle point defect of BH steel plate |
| CN110961466B (en) * | 2019-12-19 | 2021-05-28 | 北京首钢股份有限公司 | Production method of interstitial-free steel |
| CN113059007B (en) * | 2021-02-26 | 2023-05-09 | 武汉钢铁有限公司 | Method and device for positioning surface defects of rolled piece |
| CN113102501B (en) * | 2021-03-31 | 2022-10-28 | 北京首钢股份有限公司 | Method for improving surface quality of steel for automobile |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1218722A (en) * | 1997-12-05 | 1999-06-09 | 三菱重工业株式会社 | Method and apparatus for suppressing formation of surface film oxide at heat finishing rolling |
| JP3551129B2 (en) * | 2000-05-24 | 2004-08-04 | 住友金属工業株式会社 | Manufacturing method and manufacturing equipment for hot rolled steel strip |
| CN2723064Y (en) * | 2004-08-31 | 2005-09-07 | 宝山钢铁股份有限公司 | Device for improving oxidic film condition of hot rolling fine rolling work roller surface |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1218722A (en) * | 1997-12-05 | 1999-06-09 | 三菱重工业株式会社 | Method and apparatus for suppressing formation of surface film oxide at heat finishing rolling |
| JP3551129B2 (en) * | 2000-05-24 | 2004-08-04 | 住友金属工業株式会社 | Manufacturing method and manufacturing equipment for hot rolled steel strip |
| CN2723064Y (en) * | 2004-08-31 | 2005-09-07 | 宝山钢铁股份有限公司 | Device for improving oxidic film condition of hot rolling fine rolling work roller surface |
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Owner name: BEIJING SHOUGANG CO., LTD. Free format text: FORMER OWNER: HEBEI SHOUGANG QIAN AN STEEL CO., LTD. Effective date: 20140404 Free format text: FORMER OWNER: CAPITAL IRON + STEEL GENERAL CO. Effective date: 20140404 |
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Effective date of registration: 20140404 Address after: 100041 Shijingshan Road, Beijing, No. 68, No. Patentee after: Beijing Shougang Co., Ltd. Address before: Yangzidian Town, Qian'an City, Hebei province 064404 Patentee before: Hebei Shougang Qian'an Steel Co., Ltd. Patentee before: Capital Iron & Steel General Company |