CN1857807A - Hot rolling process of wide flat bar steel - Google Patents
Hot rolling process of wide flat bar steel Download PDFInfo
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- CN1857807A CN1857807A CN 200610085894 CN200610085894A CN1857807A CN 1857807 A CN1857807 A CN 1857807A CN 200610085894 CN200610085894 CN 200610085894 CN 200610085894 A CN200610085894 A CN 200610085894A CN 1857807 A CN1857807 A CN 1857807A
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Abstract
The hot rolling process of wide flat bar steel includes the following steps: heating continuously cast rectangular steel billet at 1050-1150 deg.c inside heating furnace, coarse edge rolling in an edger, descaling in a descaling unit, repeated rolling in a two-roller reversing mill, cutting ends in a hot shearing machine, finish rolling in a finishing mil group, chilling to 475-525 deg.c in a water cooler, cooling to below 200 deg.c in a cooling bed, cutting ends in a cold shearing machine, lengthing in a shear gauge, shearing to certain length in a cold shearing machine, collecting and baling. The present invention provides wide flat bar steel in certain sizes for building and bridge.
Description
Technical field:
The present invention relates to a kind of thickness is 6～25mm, and width is 150～600mm, and the cross section is the rolling mill practice of the hot rolling wide flat bar steel of rectangle.Belong to the steel production technical field.
Background technology:
Wide band steel is mainly used in flange plate, the web of steel construction piece in building, the bridge.The steel that tradition is used for this flange plate, web are by shearing or the flame cutting steel plate, through and connect and form.Therefore technology is numerous and diverse, and steel consumption is bigger, also has artificial and consumption of auxiliary materials, has increased the cost of manufacture of steel construction piece.In addition, the sheet billet of also useful medium section mill production substitutes, but the only 280mm of the width maximum of sheet billet, only can be used for the steel construction piece of small dimension, and dual-side is circular-arc, the welding operation difficulty.The steel construction piece of making is not attractive in appearance yet, and can only be used for flange plate.
Steel construction piece can be produced by batch in batch production, has reduced the construction period of building significantly and is a kind of resource of reproducible utilization, is progressively replacing reinforced concrete member.And useful medium and small-scale rolling mill is produced the wide band steel of 25～150mm in the existing steel production technology, and with the steel plate that sheet rolling mill is produced, the steel plate minimum widith is 600mm.Therefore awaiting producing a kind of width and be 150～600mm can be thick calmly, the steel of Fixed width, fixed length, and alternative steel plate is directly used in the steel construction piece.
Summary of the invention:
The objective of the invention is to overcome above-mentioned deficiency, the rolling mill practice of fixed thick, the Fixed width that provides a kind of structure steel fabrication can directly be provided, do not need to shear, weld, the hot rolling wide flat bar steel of fixed length.
The object of the present invention is achieved like this: a kind of rolling mill practice of hot rolling wide flat bar steel, it is characterized in that this method comprises following processing step: with thick 150～220mm, wide 150～600mm, 2～4 of the continuous casting rectangle bases of long 6000mm hang on the chain type on the steel device successively, after setting level, arrangement moves into charging roller, after after bumping together, delivering to heating furnace, by pusher, push heating furnace, steel billet is heated to 1050 ℃～1150 ℃, press rolling rhythm, successively by extractor, steel billet is released heating furnace to furnace delivery table, deliver to rough rolling vertical roller mill by furnace delivery table, rolling one, drafts is 10～40mm, the control width of steel billet, the thicker iron scale that loosening steel billet forms in heating process, steel billet enters the roughing descaling device behind the rolling on edge, on device, down, a left side, penetrate water under high pressure in the right nozzle, water pressure is 15～20MPa, after the billet surface iron scale rinsed well, by roller-way steel billet is delivered to the roughing mill front roller-way, steel billet is by the roughing mill front roller-way, roller-way is carried back and forth behind the machine, by centralising device before the roughing mill, centralising device presss from both sides straight centering behind the machine, reciprocal back and forth rolling 3～9 roads in roughing two-roller reversible milling train, it is thick that steel billet is rolled to 30～50mm, delivers to hot shears by the roughing mill run-out table, cuts the irregular ligule part of steel billet head by hot shears, enter mm finishing mill unit, mm finishing mill unit is by three finish rolling vertical millers, two finish rolling two roller flat roll mills, and three finish rolling four roller flat roll mills are formed, pressing the average upright average alternately file of Li Pingli arranges, four electric loopers are set between milling train, behind first finish rolling vertical miller, high pressure water descaling device are set.Steel billet enters after the mm finishing mill unit alternately the dual-side to steel billet, on, be machined to the size of finished product requirement below, 15～20Mpa pressure the water under high pressure that is produced by high pressure water descaling device washes out the iron scale that steel billet constantly produces when high temperature, automatically adjust the mill speed of each rolling mill according to the kink amount by electric looper, the mill speed of last finish rolling four roller flat roll mills is 3～5 meter per seconds, 800 ℃～850 ℃ of finishing temperatures, after rolled piece goes out mm finishing mill unit, enter and wear water-cooling apparatus, after the water spray cooling, be cooled fast to 475 ℃～525 ℃, by cold-bed run-in table, be delivered to cold bed, by last steel device rolled piece is pushed cold bed, slowly advance, be cooled to below 200 ℃, in the cold bed exit, the hydraulic pressure head device is set, workpiece front end is flattened, rolled piece is drawn in roller-way, be delivered to cold shears by following steel device, by the cold shears portion of decaptitating, by shear gauge scale on request, be cut into scale through cold shears, or double chi, cut off the rolled piece afterbody, double chi rolled piece is cut into scale again by the shear gauge scale by cold shears, by cutting the back roller-way, be delivered to collecting frame and collect, enter and collect the packing of packaging platform stacking.
The present invention has following characteristics:
1, designed two road high-pressure water descaling technology respectively before roughing, finish rolling and behind the vertical miller, guaranteed the iron scale that steel billet produces when the condition of high temperature to be rinsed well and be not pressed into billet surface, thereby guarantee wide band steel any surface finish.
2, be provided with four road rollings on edge, the steel billet both sides are processed, guaranteed the accurately vertical with dual-side of wide band steel width dimensions, corner angle are clear, guaranteed the convenience when steel construction piece is made.
3, when finish rolling, adopt automaton, guaranteed technique for continuous rolling, parted power rolling mill practice smooth implementation a little, guaranteed the advantage of the accurate and bar shaped good straightness degree of wide flat gauge.
4, adopt duo mill, four-high mill and housing of the closed top, because mill stiffness is big, simultaneously because the roll roll surface is narrower, so 3 differences of wide band steel, more accurate than steel plate with the bar difference.
5, wear the control of water cooling technology and roll the back temperature and can reduce to fast about 500 ℃ adopting after the finish rolling, to have improved the interior tissue of wide band steel effectively, to improve mechanical performance.
6, adopted the big cold bed of width 156m or 120m, guaranteed that wide band steel does not produce defectives such as bending, wave when cooling, improved the serviceability of wide band steel.
7, adopt the hydraulic pressure head device, guaranteed that head is not crooked, thereby improved the serviceability of product lumber recovery and wide band steel.
8, adopted fixed ruler cold shear, multiple length cold shears technology, under cold state, sheared the variation of having eliminated factors such as Yin Wendu effectively influence length, guaranteed wide band steel length dimension accurately, and nose shape is correct.
9, production technology is simple, and the lumber recovery high flow rate is few, and cost is lower than middle plate production cost, and construction investment lacks 50% than the medium plate mill, and product quality is better than middle plate.
In sum, the wide band steel rolling mill practice that the present invention adopts has guaranteed wide band steel any surface finish, the bar shaped good straightness degree, size is accurate, and dual-side is vertical, and corner angle are clear, can be thick surely, Fixed width, the fixed length supply of material, plate is directly made for steel construction piece and is used in alternative, does not need to shear welding.Constant product quality.Can directly do the use such as flange plate, web in the structure steel fabrication.
Description of drawings:
Fig. 1 is the technological process of production figure of the rolling mill practice of hot rolling wide flat bar steel of the present invention.
Among the figure: go up steel device 1, charging roller 2, pusher 3, heating furnace 4, extractor 5, furnace delivery table 6, rough rolling vertical roller mill 7, roughing descaling device 8, roughing mill front roller-way 9, centralising device 10 before the roughing mill, roughing two-roller reversible milling train 11, centralising device 12 behind the roughing mill, roller-way 13 behind the roughing mill, hot shears 14, finish rolling vertical miller 15, high pressure water descaling device 16, finish rolling two roller flat roll mills 17, finish rolling vertical miller 18, finish rolling two roller flat roll mills 19, electric looper 20, finish rolling four roller flat roll mills 21, finish rolling vertical miller 22, finish rolling four roller flat roll mills 23, finish rolling four roller flat roll mills 24, wear water-cooling apparatus 25, cold-bed run-in table 26, cold bed 27, hydraulic pressure head device 28,1# cold shears 29, shear gauge 30, cut back roller-way 31,2# cold shears 32,2# shear gauge 33,1# collecting frame 34,1# collects packaging platform 35,2# collecting frame 36,2# collects packaging platform 37,3# collecting frame 38, collect packaging platform 39.
The specific embodiment:
Referring to Fig. 1, the concrete processing step of the rolling mill practice of hot rolling wide flat bar steel of the present invention is as follows:
After the next continuous casting rectangle base (thick 150～220mm, wide 150～600mm, long 6000mm) of each steel mill buying enters factory, divide steel grade, specification, heat (batch) number, be deposited in the stock yard respectively.By the production schedule, 2～4 of above-mentioned continuous casting rectangle bases are hung on the chain type on the steel device 1 successively, after setting level, arrangement moves into charging roller 2, after after bumping together, delivering to heating furnace, by pusher 3, push heating furnace 4 (making fuel), through about 2 hours heating with the coal gas that gas generator produces, steel billet is heated to 1050 ℃～1150 ℃, press rolling rhythm,, steel billet is released heating furnace to furnace delivery table 6 successively by extractor 5, deliver to rough rolling vertical roller mill 7 by furnace delivery table, rolling drafts is 10～40mm together, the control width of steel billet, the thicker iron scale that loosening steel billet forms in heating process is so that the descaling device flushing.Steel billet enters roughing descaling device 8 behind the rolling on edge, penetrate water under high pressure in the nozzle by the device upper and lower, left and right, water pressure is 15～20MPa, after the billet surface iron scale rinsed well, by roller-way steel billet is delivered to the roughing mill front roller-way, steel billet by roughing mill front roller-way 9, machine after roller-way 13 carry back and forth, by the straight centering of centralising device behind centralising device before the roughing mill 10, the machine 12 folder, reciprocal back and forth rolling 3～9 roads in roughing two-roller reversible milling train 11, it is thick that steel billet is rolled to 30～50mm.Deliver to hot shears 14 by the roughing mill run-out table, cut the irregular ligule part of steel billet head by hot shears.Enter mm finishing mill unit, mm finishing mill unit is made up of 17,19, three finish rolling of 15,18,22, two finish rolling of three finish rolling vertical millers, two roller flat roll mills, four roller flat roll mills 21,23,24.Press the average upright average alternately file of Li Pingli and arrange, 20, the first finish rolling vertical millers 15 of four electric loopers are set between milling train after, high pressure water descaling device 16 is set.Steel billet enters the dual-side, the above and below that replace steel billet after the mm finishing mill unit and is machined to the size that finished product requires, 15～20Mpa pressure the water under high pressure that is produced by high pressure water descaling device washes out the iron scale that steel billet constantly produces when high temperature, automatically adjust the mill speed of each rolling mill by electric looper according to the kink amount, to guarantee to part a little the smooth implementation of power continuous rolling process.Guarantee to obtain the whole piece finished product that cross dimensions is accurate, dual-side is vertical, corner angle are clear, bar shaped is straight.The mill speed of last finish rolling four roller flat roll mills 24 is 3～5 meter per seconds, and 800 ℃～850 ℃ of finishing temperatures after rolled piece goes out mm finishing mill unit, enter and wear water-cooling apparatus 25, after the water spray cooling, is cooled fast to about 500 ℃.By cold-bed run-in table 26, be delivered to cold bed, by last steel device rolled piece is pushed cold bed 27, the long 10m of cold bed, wide 156m slowly advances, be cooled to below 200 ℃, in the cold bed exit, the hydraulic pressure head device, workpiece front end is flattened, rolled piece is drawn in roller-way, be delivered to 1# cold shears 29 by following steel device, by the cold shears portion of decaptitating,, be cut into scale through cold shears by shear gauge 30 scale on request, or double chi, cut off the rolled piece afterbody.Double chi rolled piece by 2# shear gauge 33 scales, is cut into scale by 2# cold shears 32 again, by cutting back roller-way 31, is delivered to collecting frame.6～12 meters scale enters 1# collecting frame 34,3# collecting frame 38 respectively.On stand, carry out product inspection, after bumping together, enter respectively and collect the packing of packaging platform 35,39 stackings.Enter 2# collecting frame 36 greater than 12 meters speciality scales, collect packaging platform 37, the stacking packing by 2#.Sling by overhead traveling crane at last, weigh, mark back warehouse-in through weighing.
Claims (3)
1, a kind of rolling mill practice of hot rolling wide flat bar steel, it is characterized in that this method comprises following processing step: with thick 150～220mm, wide 150～600mm, 2～4 of the continuous casting rectangle bases of long 6000mm hang on the chain type on the steel device successively, after setting level, arrangement moves into charging roller, after after bumping together, delivering to heating furnace, by pusher, push heating furnace, steel billet is heated to 1050 ℃～1150 ℃, press rolling rhythm, successively by extractor, steel billet is released heating furnace to furnace delivery table, deliver to rough rolling vertical roller mill by furnace delivery table, rolling one, drafts is 10～40mm, the control width of steel billet, the thicker iron scale that loosening steel billet forms in heating process, steel billet enters the roughing descaling device behind the rolling on edge, on device, down, a left side, penetrate water under high pressure in the right nozzle, water pressure is 15～20MPa, after the billet surface iron scale rinsed well, by roller-way steel billet is delivered to the roughing mill front roller-way, steel billet is by the roughing mill front roller-way, roller-way is carried back and forth behind the machine, by centralising device before the roughing mill, centralising device presss from both sides straight centering behind the machine, reciprocal back and forth rolling 3～9 roads in roughing two-roller reversible milling train, it is thick that steel billet is rolled to 30～50mm, delivers to hot shears by the roughing mill run-out table, cuts the irregular ligule part of steel billet head by hot shears, enter mm finishing mill unit, mm finishing mill unit is by three finish rolling vertical millers, two finish rolling two roller flat roll mills, and three finish rolling four roller flat roll mills are formed, pressing the average upright average alternately file of Li Pingli arranges, four electric loopers are set between milling train, behind first finish rolling vertical miller, high pressure water descaling device are set.Steel billet enters after the mm finishing mill unit alternately the dual-side to steel billet, on, be machined to the size of finished product requirement below, 15～20Mpa pressure the water under high pressure that is produced by high pressure water descaling device washes out the iron scale that steel billet constantly produces when high temperature, automatically adjust the mill speed of each rolling mill according to the kink amount by electric looper, the mill speed of last finish rolling four roller flat roll mills is 3～5 meter per seconds, 800 ℃～850 ℃ of finishing temperatures, after rolled piece goes out mm finishing mill unit, enter and wear water-cooling apparatus, after the water spray cooling, be cooled fast to 475 ℃～525 ℃, by cold-bed run-in table, be delivered to cold bed, by last steel device rolled piece is pushed cold bed, slowly advance, be cooled to below 200 ℃, in the cold bed exit, the hydraulic pressure head device is set, workpiece front end is flattened, rolled piece is drawn in roller-way, be delivered to cold shears by following steel device, by the cold shears portion of decaptitating, by shear gauge scale on request, be cut into scale through cold shears, or double chi, cut off the rolled piece afterbody, double chi rolled piece is cut into scale again by the shear gauge scale by cold shears, by cutting the back roller-way, be delivered to collecting frame and collect, enter and collect the packing of packaging platform stacking.
2, the rolling mill practice of a kind of hot rolling wide flat bar steel according to claim 1 is characterized in that: double chi rolled piece is cut into scale again by the shear gauge scale by cold shears.
3, the rolling mill practice of a kind of hot rolling wide flat bar steel according to claim 1 and 2 is characterized in that: described cold bed width is 120m or 156m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100858944A CN100382903C (en) | 2006-05-30 | 2006-05-30 | Hot rolling process of wide flat bar steel |
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| CNB2006100858944A CN100382903C (en) | 2006-05-30 | 2006-05-30 | Hot rolling process of wide flat bar steel |
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| CN1857807A true CN1857807A (en) | 2006-11-08 |
| CN100382903C CN100382903C (en) | 2008-04-23 |
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| CNB2006100858944A Expired - Fee Related CN100382903C (en) | 2006-05-30 | 2006-05-30 | Hot rolling process of wide flat bar steel |
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| CN101195124B (en) * | 2007-12-27 | 2010-06-23 | 江苏沙钢集团淮钢特钢有限公司 | Method for tandem rolling steel flat for automobile beam |
| CN101007315B (en) * | 2007-01-18 | 2010-10-06 | 湖南华菱涟源钢铁有限公司 | Slotless rolling process of full horizontal rolling mill |
| CN102019390A (en) * | 2010-12-31 | 2011-04-20 | 山东泰山钢铁集团有限公司 | Online austenitic stainless steel continuous casting plate blank water-spraying cooling method and special device thereof |
| CN102256719A (en) * | 2008-12-18 | 2011-11-23 | Sms西马格股份公司 | Method and device for descaling a metal strip |
| CN102039515B (en) * | 2009-10-22 | 2012-11-07 | 中山市毅马五金有限公司 | Machining process of hot bent end plate |
| CN103605842A (en) * | 2013-11-12 | 2014-02-26 | 燕山大学 | Design method of annealing unit furnace section furnace roll shape |
| CN103706635A (en) * | 2013-12-26 | 2014-04-09 | 河南万达铝业有限公司 | Aluminum strip hot rolling system |
| CN104128367A (en) * | 2014-07-15 | 2014-11-05 | 北京首特冶金设备技术有限公司 | Short stress continuous rolling unit and system for rolling wide flat steel |
| CN105171097A (en) * | 2015-06-30 | 2015-12-23 | 中冶华天工程技术有限公司 | Shearing device and technique for cold shearing of finish-rolled deformed steel bar |
| CN105382546A (en) * | 2015-12-19 | 2016-03-09 | 重庆麦拓科技有限公司 | Tool and die steel production line |
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| CN105414176A (en) * | 2015-12-19 | 2016-03-23 | 重庆麦拓科技有限公司 | Hot-rolled steel bar production line |
| CN107345270A (en) * | 2017-07-12 | 2017-11-14 | 唐山新宝泰钢铁有限公司 | Steel billet feeding buffer unit, steel billet feeding system and its operating method |
| CN110000210A (en) * | 2019-04-30 | 2019-07-12 | 中冶赛迪技术研究中心有限公司 | A kind of method and system of continuous casting and rolling production cold forming steel |
| CN110470211A (en) * | 2019-05-15 | 2019-11-19 | 哈尔滨锅炉厂有限责任公司 | One kind being applied to membrane wall and clamps the efficient check device of band steel centering size |
| CN110814031A (en) * | 2019-10-11 | 2020-02-21 | 山东盛阳金属科技股份有限公司 | Wide-band thin-plate stainless steel rolling equipment and hot rolling process thereof |
| WO2021063363A1 (en) * | 2019-09-30 | 2021-04-08 | 宝钢湛江钢铁有限公司 | Steel plate double-pre-stacking system for single shear line, and stacking method thereof |
| CN112845628A (en) * | 2021-01-08 | 2021-05-28 | 山东省冶金设计院股份有限公司 | Progressive horizontal-vertical conversion device for hot-rolled flat steel |
| CN114888076A (en) * | 2022-06-02 | 2022-08-12 | 武钢集团襄阳重型装备材料有限公司 | Rolling method of single-side double-groove spring flat steel |
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| DE3517090A1 (en) * | 1985-05-11 | 1986-11-13 | SMS Schloemann-Siemag AG, 4000 Düsseldorf | METHOD FOR ROLLING FROM ROOF TO WARM BROADBAND |
| EP0591291B1 (en) * | 1991-06-28 | 1995-11-08 | Siemens Aktiengesellschaft | Regulation in the manufacture of hot rolled strips by means of a multi-stand hot rolling mill |
| IT1288863B1 (en) * | 1996-03-15 | 1998-09-25 | Danieli Off Mecc | CONTINUOUS LAMINATION PROCESS FOR SHEETS AND / OR TAPES AND RELATED CONTINUOUS ROLLING LINE |
| IT1290743B1 (en) * | 1997-04-10 | 1998-12-10 | Danieli Off Mecc | LAMINATION PROCESS FOR FLAT PRODUCTS WITH THIN THICKNESSES AND RELATED ROLLING LINE |
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| CN101007315B (en) * | 2007-01-18 | 2010-10-06 | 湖南华菱涟源钢铁有限公司 | Slotless rolling process of full horizontal rolling mill |
| CN101195124B (en) * | 2007-12-27 | 2010-06-23 | 江苏沙钢集团淮钢特钢有限公司 | Method for tandem rolling steel flat for automobile beam |
| CN102256719A (en) * | 2008-12-18 | 2011-11-23 | Sms西马格股份公司 | Method and device for descaling a metal strip |
| CN102039515B (en) * | 2009-10-22 | 2012-11-07 | 中山市毅马五金有限公司 | Machining process of hot bent end plate |
| CN102019390A (en) * | 2010-12-31 | 2011-04-20 | 山东泰山钢铁集团有限公司 | Online austenitic stainless steel continuous casting plate blank water-spraying cooling method and special device thereof |
| CN102019390B (en) * | 2010-12-31 | 2012-12-12 | 山东泰山钢铁集团有限公司 | Online austenitic stainless steel continuous casting plate blank water-spraying cooling method and special device thereof |
| CN103605842A (en) * | 2013-11-12 | 2014-02-26 | 燕山大学 | Design method of annealing unit furnace section furnace roll shape |
| CN103605842B (en) * | 2013-11-12 | 2016-05-04 | 燕山大学 | Connect the method for designing of moving back unit furnace subsegment furnace roller roll shape |
| CN103706635A (en) * | 2013-12-26 | 2014-04-09 | 河南万达铝业有限公司 | Aluminum strip hot rolling system |
| CN103706635B (en) * | 2013-12-26 | 2016-08-17 | 河南万达铝业有限公司 | A kind of aluminium strip hot rolling system |
| CN104128367A (en) * | 2014-07-15 | 2014-11-05 | 北京首特冶金设备技术有限公司 | Short stress continuous rolling unit and system for rolling wide flat steel |
| CN105171097A (en) * | 2015-06-30 | 2015-12-23 | 中冶华天工程技术有限公司 | Shearing device and technique for cold shearing of finish-rolled deformed steel bar |
| CN105171097B (en) * | 2015-06-30 | 2017-09-26 | 中冶华天工程技术有限公司 | Fining twisted steel cold shears shear and shears technique |
| CN105414176A (en) * | 2015-12-19 | 2016-03-23 | 重庆麦拓科技有限公司 | Hot-rolled steel bar production line |
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| CN105382546A (en) * | 2015-12-19 | 2016-03-09 | 重庆麦拓科技有限公司 | Tool and die steel production line |
| CN107345270A (en) * | 2017-07-12 | 2017-11-14 | 唐山新宝泰钢铁有限公司 | Steel billet feeding buffer unit, steel billet feeding system and its operating method |
| CN107345270B (en) * | 2017-07-12 | 2019-03-15 | 唐山新宝泰钢铁有限公司 | Steel billet feeding buffer unit, steel billet feeding system and its operating method |
| CN110000210A (en) * | 2019-04-30 | 2019-07-12 | 中冶赛迪技术研究中心有限公司 | A kind of method and system of continuous casting and rolling production cold forming steel |
| CN110470211A (en) * | 2019-05-15 | 2019-11-19 | 哈尔滨锅炉厂有限责任公司 | One kind being applied to membrane wall and clamps the efficient check device of band steel centering size |
| WO2021063363A1 (en) * | 2019-09-30 | 2021-04-08 | 宝钢湛江钢铁有限公司 | Steel plate double-pre-stacking system for single shear line, and stacking method thereof |
| CN110814031A (en) * | 2019-10-11 | 2020-02-21 | 山东盛阳金属科技股份有限公司 | Wide-band thin-plate stainless steel rolling equipment and hot rolling process thereof |
| CN112845628A (en) * | 2021-01-08 | 2021-05-28 | 山东省冶金设计院股份有限公司 | Progressive horizontal-vertical conversion device for hot-rolled flat steel |
| CN112845628B (en) * | 2021-01-08 | 2023-08-15 | 山东省冶金设计院股份有限公司 | Progressive flat-vertical conversion device for hot-rolled flat steel |
| CN114888076A (en) * | 2022-06-02 | 2022-08-12 | 武钢集团襄阳重型装备材料有限公司 | Rolling method of single-side double-groove spring flat steel |
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| CN100382903C (en) | 2008-04-23 |
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