CN101700533A - Method for increasing scale removal effect of medium and heavy plate - Google Patents
Method for increasing scale removal effect of medium and heavy plate Download PDFInfo
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- CN101700533A CN101700533A CN200910228810A CN200910228810A CN101700533A CN 101700533 A CN101700533 A CN 101700533A CN 200910228810 A CN200910228810 A CN 200910228810A CN 200910228810 A CN200910228810 A CN 200910228810A CN 101700533 A CN101700533 A CN 101700533A
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Abstract
The invention belongs to the technical field of metallurgical technology, in particular to the technology for improving the scale removal effect of a medium and heavy plate. Pocking marks on the surface of the medium and heavy plate are the main defect which affects the surface quality thereof and one of projects to be constantly studied and improved. The invention provides a method for improving the scale removal effect of the medium and heavy plate in order to meet the requirements of high-grade varieties on the surface quality of a steel plate. The method comprises the following steps of: in working procedures of a converter and an LF furnace, the range of Si in molten steel elements is controlled to be 0.15%-035%; in the working procedures of a rolled steel, the furnace temperature in a heating section of the heating furnace is controlled to be 1200-1280 DEG C; and the tapping temperature of a billet steel is 1120-1140 DEG C; wherein the standard thickness of the heavy plate is 10-60mm. The method increases the scale removal effect on iron scale of the billet steel; wherein the scale removal rate of primary iron scale of the billet steel reaches 100%; the scale removal rate of finish rolling secondary iron scale of the billet steel reaches or surpasses 95%, thus putting an end to the generation of the pocking marks of the steel plate and meeting the requirements of the high-grade varieties.
Description
Technical field
The invention belongs to metallurgical technology field, a kind of method of improving the medium plate scale removal effect particularly is provided.
Technical background
Cut deal is the problem of High Strength Low Alloy Medium Plate surface " pit " particularly, it is the major defect that influences the High Strength Low Alloy Medium Plate surface quality level always, it forms main cause, be since once or the secondary oxidation iron sheet rolling before with rolling in not Ex-all, residual iron scale is pressed into when rolling in the steel matrix, and steel plate is in user's use, through cold deformation or Shot Blasting, originally the iron sheet that was embedded in the steel matrix surface comes off, and pit occurs at surface of steel plate.Promptly so-called " pit ".Optimizing scale structure and heating furnace technology, improve scale removal effect, improve the cut deal surface quality level, also is one of cut deal industry major subjects of constantly studying for many years always, improve and improving.
The mechanism that iron scale forms is that steel billet is under the condition of high temperature, exist two kinds of diffusions on steel billet matrix top layer, a kind of diffusion that is steel billet iron matrix element to the top layer, a kind of be airborne oxygen element by the steel billet top layer to the matrix diffusion inside, two kinds of elements generate the oxide of different chemical valence iron in conjunction with the back, different in the speed of billet surface diffusion according to oxygen in the air with the iron matrix element, be followed successively by Fe from iron sheet surface to basal body structure
2O
3, Fe
3O
4, FeO, wherein FeO since its fusing point low, peel off weak effect, be difficult for to remove during de-scaling.
In addition the Si in the steel billet composition to iron scale to peel off influential effect very big, the Si of billet surface can form fayalite (FeO-Fe
2SiO
4) be present between matrix and the FeO, iron scale adhesive force being strengthened be difficult to remove, fayalite can solidify being lower than 1177 ℃, if not exclusively remove, then causes the formation of cut deal plate face residue red rust and " pit " to see Fig. 1.
Iron scale is divided into once oxidation iron sheet and secondary oxidation iron sheet according to its forming process difference.To be steel billet form in the process of heating furnace heating the once oxidation iron sheet and since steel billet at high temperature the time longer, generally at 2-4 hour, the thickness that the billet surface iron scale generates is thicker, generally about 2mm.The secondary oxidation iron sheet forms in the operation of rolling after being the steel billet heating, because steel billet temperature in rolling is lower, the iron sheet formation speed is slower, thinner thickness.
Along with the fast development of domestic and international wind-power electricity generation, skyscraper industry, the wind tower of having relatively high expectations for surface quality on the market was bigger with the steel demand with steel, skyscraper in recent years, and above-mentioned kind steel plate does not allow the plate face to have " pit " defective.Present domestic Heavy Plate Plant remove steel billet once with secondary oxidation iron sheet technology on, generally the descaling method of Cai Yonging is a high-pressure water descaling, at remove once, the secondary oxidation iron sheet, the high-pressure water descaling case is set behind heating furnace, in roughing, finish rolling the milling train de-scaling is set respectively, about high-pressure water descaling system design pressure 18Mpa, once oxidation iron sheet de-scaling rate generally reaches about 90% behind the De-scaling box, and finish rolling secondary oxidation iron sheet de-scaling rate reaches about 70-80%.The descaling process of this routine can not satisfy wind tower steel, skyscraper with high-level kinds such as steel to the high-level requirement of plate surface quality level
Summary of the invention
The present invention for satisfy wind tower steel, skyscraper with high-level kinds such as steel to the high-level requirement of plate surface quality, by analysis to scale structure, high-pressure water descaling principle, by adjusting smelting, rolling mill practices such as the chemical analysis content influence the iron sheet structure essential element and steel billet tapping temperature scope, design a kind of method that improves the medium plate scale removal effect.
The method of raising medium plate scale removal effect of the present invention mainly realizes by following method.
The main technique step comprises that molten iron → converter → LF stove → sheet billet continuous casting → slab heating → high-pressure water descaling → roughing → finish rolling → ACC cooling → heat is rectified → cooling → finishing (sampling) → steel plate check warehouse-in.In the smelting procedure of converter and LF refining furnace, Si content in the heater for rolling steel heating process, is taked high temperature section Fast Heating method in the control molten steel composition in the 0.15%-0.35% scope, and control furnace temperature at 1200-1280 ℃, the steel billet tapping temperature is 1120-1140 ℃.The method of described raising medium plate scale removal effect, wherein the gauge thickness of medium plate is 10-60mm.
Use the method for raising medium plate scale removal effect provided by the invention, particularly at High Strength Low Alloy Medium Plate, improved to steel billet once with secondary oxidation iron sheet scale removal effect, wherein once oxidation iron sheet de-scaling rate reaches 100% behind the De-scaling box, finish rolling secondary oxidation iron sheet de-scaling rate on average meets or exceeds 95%, take place thereby stopped steel plate " pit ", the plate surface quality level can satisfy wind tower steel, the skyscraper special requirement with high-level kinds such as steel.
The specific embodiment
Fig. 1 be the formation of cut deal plate face residue red rust and " pit " and iron scale, fayalite structure and rolling in the variation schematic diagram.
The present invention is for solving above-mentioned " pit " problem, by the analysis to scale structure, high-pressure water descaling principle, by adjusting the chemical analysis content that affects the iron sheet structure essential element, and according to the affect rule of steel billet tapping temperature to secondary oxidation iron sheet scale removal effect, designing optimal steel billet tapping temperature scope, under the cut deal machine condition of present domestic routine, improve the cut deal scale removal effect, to solve cut deal ubiquitous " pit " problem, satisfy the high-level kinds such as wind tower steel, Steels for High Rise Buildings to the high-level requirement of plate surface quality.
The present invention is a High Strength Low Alloy Medium Plate, and its gauge thickness is 10-60mm.The production process route of this product is: molten iron → converter → LF stove → sheet billet continuous casting → slab heating → high-pressure water descaling → roughing → finish rolling → ACC cooling → heat is rectified → cooling → finishing (sampling) → steel plate check warehouse-in.
The specific embodiment of the present invention comprises:
1, chemical analysis design.
The High Strength Low Alloy Medium Plate chemical analysis is carried out GB/T1591-2008, this standard-required elements Si≤0.50%.Fayalite (FeO-Fe according to the formation of Si element
2SiO
4), iron scale adhesive force is strengthened be difficult to remove principle, carry out commerical test relatively by repeatedly designing different Si content, determined best Si content scope of design 0.15-0.35%.
2, heating-furnace temperature control
Take high temperature Fast Heating method in the heating furnace bringing-up section, Control for Kiln Temperature reduces the steel billet thickness that once oxidation generates in stove at 1200-1280 ℃, reduces FeO thickness proportion in the iron sheet structure.
3, steel billet tapping temperature
The production of High Strength Low Alloy Medium Plate generally adopts the controlled rolling mode rolling, two stage rolling are all adopted in general controlled rolling, promptly stage roughing recrystallization zone is rolling and two-stage finish rolling non-recrystallization district is rolling, and before two-stage finish rolling non-recrystallization district is rolling, the higher needs of intermediate blank temperature are treated temperature, the high-strength plate finish rolling of low-alloy start rolling temperature is generally below 950 ℃, intermediate blank is treated during the temperature secondary scale structure and generates thickness directly to influence the finish rolling scale removal effect, by repeatedly commerical test, set different steel billet tapping temperatures, relatively secondary thickness of scale and finish rolling scale removal effect before the finish rolling determine that best steel billet tapping temperature is 1120-1140 ℃.
By the High Strength Low Alloy Medium Plate that the present invention produces, improved to steel billet once with secondary oxidation iron sheet scale removal effect, stopped steel plate " pit " and taken place, the plate surface quality level can satisfy the requirement with high-level kinds such as steel of wind tower steel, skyscraper
Embodiment 1:
(1), chemical analysis
(2), slab size, steel plate specification
Slab size: 250*1600*3350mm (cold), steel plate specification: 22*2480*8000mm
(3), rolling technological parameter
Bringing-up section Control for Kiln Temperature: 1200-1250 ℃.1120 ℃ of steel billet tapping temperatures, finish rolling two-stage start rolling temperature: 930 ℃ of intermediate blank are treated temperature thickness: 60mm
(4), slab once oxidation, secondary oxidation de-scaling rate and surface of steel plate situation
Detect through 10 blocks of slabs and steel plate to a stove, slab once oxidation iron sheet de-scaling rate reaches 100% behind the De-scaling box, and finish rolling secondary oxidation iron sheet de-scaling rate on average reaches 95%, and the finished product steel plate is checked behind ball blast, defective that the surface does not occur macroscopic " pit ".
Embodiment 2:
(1), chemical analysis
(2), slab size, steel plate specification
Slab size: 250*1600*3350mm (cold), steel plate specification: 50*2480*8000mm
(3), rolling technological parameter
Bringing-up section Control for Kiln Temperature: 1200-1270 ℃.1140 ℃ of steel billet tapping temperatures, finish rolling two-stage start rolling temperature: 910 ℃, intermediate blank is treated temperature thickness: 110mm.
(4), slab once oxidation, secondary oxidation de-scaling rate and surface of steel plate situation
Detect through 9 blocks of slabs and steel plate to a stove, slab once oxidation iron sheet de-scaling rate reaches 100% behind the De-scaling box, and finish rolling secondary oxidation iron sheet de-scaling rate on average reaches 97%, and the finished product steel plate is checked behind ball blast, defective that the surface does not occur macroscopic " pit ".
Claims (2)
1. method that improves the medium plate scale removal effect, the main technique step comprises that molten iron → converter → LF stove → sheet billet continuous casting → slab heating → high-pressure water descaling → roughing → finish rolling → ACC cooling → heat is rectified → cooling → finishing (sampling) → steel plate check warehouse-in; It is characterized in that smelting by converter and LF refining furnace, Si content in the heater for rolling steel heating process, is taked high temperature section Fast Heating method in the control molten steel composition in the 0.15%-0.35% scope, the bringing-up section Control for Kiln Temperature is at 1200-1280 ℃, and the steel billet tapping temperature is 1120-1140 ℃.
2. the method for raising medium plate scale removal effect according to claim 1, the gauge thickness that it is characterized in that medium plate is 10-60mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910228810A CN101700533A (en) | 2009-11-27 | 2009-11-27 | Method for increasing scale removal effect of medium and heavy plate |
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|---|---|---|---|
| CN200910228810A CN101700533A (en) | 2009-11-27 | 2009-11-27 | Method for increasing scale removal effect of medium and heavy plate |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102534152A (en) * | 2012-01-31 | 2012-07-04 | 首钢总公司 | Rolling method capable of preventing pockmarks on surface of ship plate |
| CN103212571A (en) * | 2013-04-18 | 2013-07-24 | 湖南华菱湘潭钢铁有限公司 | Method for producing oxide scale capable of preventing steel plate surface from getting rusty |
| CN103909104A (en) * | 2014-03-24 | 2014-07-09 | 济钢集团有限公司 | Method for controlling piebaldness on surface of steel plate |
| CN105200215A (en) * | 2015-10-09 | 2015-12-30 | 天津钢铁集团有限公司 | Production method of 50mm-100mm microalloy thick plate |
| CN108393360A (en) * | 2017-02-05 | 2018-08-14 | 鞍钢股份有限公司 | Method for improving surface quality of medium plate |
| GB2569210A (en) * | 2017-12-05 | 2019-06-12 | British Steel Ltd | Steel profile and method of processing steel |
| GB2571805A (en) * | 2017-12-05 | 2019-09-11 | British Steel Ltd | Steel profile and method of processing steel |
| CN111822528A (en) * | 2020-04-17 | 2020-10-27 | 广东韶钢松山股份有限公司 | Medium plate and production method thereof |
| CN111872141A (en) * | 2020-08-12 | 2020-11-03 | 宝武集团鄂城钢铁有限公司 | Method for improving descaling quality of nickel-containing steel plate |
| CN112893467A (en) * | 2021-01-14 | 2021-06-04 | 山东钢铁集团日照有限公司 | Method for controlling edge folding of wide and thick steel plate |
| CN114273442A (en) * | 2022-01-07 | 2022-04-05 | 鞍钢股份有限公司 | Method for reducing iron scale on surface of medium plate |
-
2009
- 2009-11-27 CN CN200910228810A patent/CN101700533A/en active Pending
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102534152A (en) * | 2012-01-31 | 2012-07-04 | 首钢总公司 | Rolling method capable of preventing pockmarks on surface of ship plate |
| CN102534152B (en) * | 2012-01-31 | 2014-08-27 | 首钢总公司 | Rolling method capable of preventing pockmarks on surface of ship plate |
| CN103212571A (en) * | 2013-04-18 | 2013-07-24 | 湖南华菱湘潭钢铁有限公司 | Method for producing oxide scale capable of preventing steel plate surface from getting rusty |
| CN103212571B (en) * | 2013-04-18 | 2015-06-10 | 湖南华菱湘潭钢铁有限公司 | Method for producing oxide scale capable of preventing steel plate surface from getting rusty |
| CN103909104A (en) * | 2014-03-24 | 2014-07-09 | 济钢集团有限公司 | Method for controlling piebaldness on surface of steel plate |
| CN105200215A (en) * | 2015-10-09 | 2015-12-30 | 天津钢铁集团有限公司 | Production method of 50mm-100mm microalloy thick plate |
| CN105200215B (en) * | 2015-10-09 | 2017-12-29 | 天津钢铁集团有限公司 | A kind of 50 100mm microalloy Heavy plate production methods |
| CN108393360A (en) * | 2017-02-05 | 2018-08-14 | 鞍钢股份有限公司 | Method for improving surface quality of medium plate |
| GB2569210A (en) * | 2017-12-05 | 2019-06-12 | British Steel Ltd | Steel profile and method of processing steel |
| GB2571805A (en) * | 2017-12-05 | 2019-09-11 | British Steel Ltd | Steel profile and method of processing steel |
| GB2569210B (en) * | 2017-12-05 | 2019-12-11 | British Steel Ltd | Steel profile |
| GB2571805B (en) * | 2017-12-05 | 2020-12-16 | Jingye Steel Uk Ltd | Steel product |
| CN111822528A (en) * | 2020-04-17 | 2020-10-27 | 广东韶钢松山股份有限公司 | Medium plate and production method thereof |
| CN111872141A (en) * | 2020-08-12 | 2020-11-03 | 宝武集团鄂城钢铁有限公司 | Method for improving descaling quality of nickel-containing steel plate |
| CN112893467A (en) * | 2021-01-14 | 2021-06-04 | 山东钢铁集团日照有限公司 | Method for controlling edge folding of wide and thick steel plate |
| CN114273442A (en) * | 2022-01-07 | 2022-04-05 | 鞍钢股份有限公司 | Method for reducing iron scale on surface of medium plate |
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Application publication date: 20100505 |