CN103643248A - Method and device for eliminating strip steel pickling parking spots - Google Patents
Method and device for eliminating strip steel pickling parking spots Download PDFInfo
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- CN103643248A CN103643248A CN201310597194.3A CN201310597194A CN103643248A CN 103643248 A CN103643248 A CN 103643248A CN 201310597194 A CN201310597194 A CN 201310597194A CN 103643248 A CN103643248 A CN 103643248A
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- band steel
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Abstract
The invention discloses a method and a device for eliminating strip steel pickling parking spots. The method comprises the steps of: 1) flushing the upper surface and the lower surface of strip steel after the strip steel reaches cleaning grooves; 2) squeezing out the residual liquid from the upper surface and the lower surface of the strip steel by squeeze rolls; 3) at the time of production shutdown, spray sweeping the strip steel by side spray nozzles; 4) when production is resumed, letting upper spray nozzles and lower spray nozzles spray the upper surface and the lower surface of the strip steel, brushing the strip steel surfaces by brush rolls at a strip steel outlet, and carrying out spraying through inclined spray nozzles; and 5) bringing the strip steel into air to undergo purging and air drying. For the device, side spraying apparatuses are additionally disposed in each cleaning section, and a scrubbing instrument is additionally mounted in the last cleaning section. The side spraying apparatuses spray water to the surfaces of the static strip steel continuously so as to make the substances generated on the surfaces difficult to deposit, and the brush rolls at the later cleaning section are employed to brush off the layer of substances on the strip steel surfaces, thereby reaching the purpose of complete cleaning of the strip steel surfaces and preventing generation of parking spots.
Description
Technical field
The present invention relates to the belt steel surface parking spot removal technology in iron and steel cold rolling process, refer to particularly a kind of method and device of eliminating strip pickling parking spot.
Technical background
There is one deck iron scale in coils of hot-rolled steel surface, at cold rolling process, this layer of iron scale need to be removed.The normal method of pickling that adopts is removed.In continuous pickling process, due to a variety of causes, often need to shut down, be now with steel due at cleaning section overstand, be easy at belt steel surface deposition Fe (OH)
3deng material, after hyperthermia drying, this layer of material in surface is attached to belt steel surface, presents the surface imperfection of blackout or jaundice, has a strong impact on the surface quality with steel.
In solving the patent documentation of this class problem, publication number is the control method that the application for a patent for invention specification sheets of CN102677078A discloses a kind of shallow slot turbulent flow pickling unit parking spot, it is by the rinse water of emptying cleaning section, and injection subsequently has the corrosion inhibiting solution of corrosion inhibition, be allowed to condition at belt steel surface and form one deck corrosion inhibiting film, thereby prevent that belt steel surface from reacting generation Fe (OH) with water
3deng material.In this method, emptying rinse water and refill the time that corrosion inhibiting solution need to be longer, are unfavorable for the clean of belt steel surface.And need the extra inhibiter that adds at every turn, increase cost, and in the situation of frequent shutdown, cannot effectively utilize inhibiter.In addition, inhibiter also forms certain pollution to the cell body of rinse bath, is unfavorable for the clean of strip surface quality.
Except add the method for inhibiter in cleaning section, other normal method adopting is rewinding method, the place of finishing in the last operation of acid tank and rinse tank arranges brushing device, and by band steel reversed pickling tank and rinse tank in acid tank and rinse tank, band steel cleans strip steel surface residual acid while falling back.In this kind of method, the problem of existence mainly contains 1) there is the corrosion to equipment before acid tank during rewinding; 2) the band steel of washing for caproic acid, during rewinding, steel band reenters acid tank, has further increased the weight of the corrosion to base steel, and the surface quality of product is had a negative impact.
Summary of the invention
Object of the present invention is exactly to overcome the defect that above-mentioned prior art exists, a kind of method and device of eliminating strip pickling parking spot is provided, can eliminate the belt steel surface parking spot in iron and steel cold rolling process, improve the surface quality with steel, its method easy handling, operating efficiency is high, and device has simple in structure, advantage easy to use.
For achieving the above object, the method for the elimination strip pickling parking spot that the present invention is designed, comprises the following steps:
1), in production process, arrive after rinse bath, start upper nozzle and lower nozzle in rinse bath, respectively the upper surface with steel and lower surface are rinsed;
2), the raffinate with steel upper surface and lower surface squeezes out by the squeezing roller effect arranging in pairs up and down between two adjacent rinse baths;
3), while produce shutting down, upper nozzle and lower nozzle are stopped using, and open a plurality of side spray shower nozzles on rinse bath sidewall, it is 0.5-50Bar that pressure is swept in the spray of side spray shower nozzle, by the impact of spraying pressure, avoids belt steel surface deposition Fe (OH)
2, and belt steel surface and air are completely cut off, reduce Surface Creation Fe (OH)
3;
4), when resuming production, side spray shower nozzle is stopped using, enabling upper nozzle and lower nozzle sprays band steel upper and lower surface, and start and be arranged on the brush roll in 1-2 the rinse bath at steel exports place simultaneously, and brush roll is towards the inclination shower nozzle arranging with steel traffic direction side, by the spray effect of inclination shower nozzle, and after brush roll brushes off the material of belt steel surface, a small amount of Fe of belt steel surface (OH)
3remove completely;
5), by brush roll brush and spray after band steel enter in air and purge, then air-dry by hot blast, after the band steel in resting on rinse bath passes through completely, the brush roll of stopping using, returns to normal production.
Further, the side spray shower nozzle in described step is used de-salted water to purge band steel.
Again further, described desalination electrical conductivity of water is 5～50 μ s/cm, and the oxygen level of de-salted water is less than 5ppm, and the temperature of de-salted water is 5～30 ℃, and de-salted water spraying pressure is 0.5～10Bar.
Again further, the side spray shower nozzle in described step is used protective gas N
2, CO
2, a kind of in Ar purge band steel.
Again further, the pressure of described protective gas is 0.5～50Bar, and temperature is 5～30 ℃, gas dew point≤0 ℃.
The present invention also provides a kind of device of above-mentioned elimination strip pickling parking spot method, comprises a plurality of rinse baths, and is arranged on a plurality of side spray shower nozzles on each rinse bath sidewall, and described a plurality of side spray shower nozzles lay respectively at the both sides of steel and are up and down and are interspersed; Also be included in the upper nozzle and the lower nozzle that with above steel upper surface and lower surface below, arrange respectively in each rinse bath, and being arranged at least one pair of squeezing roller between every two adjacent rinse baths, described every pair of squeezing roller lays respectively at band steel above and below and is close to belt steel surface; And be arranged on the brush roll in 1-2 the rinse bath at steel exports place, described brush roll arranges in pairs, and every pair of brush roll lays respectively at band steel above and below and is close to belt steel surface; The brush roll of described paired setting is provided with inclination shower nozzle towards the side with steel traffic direction, and the nozzle of described inclination shower nozzle is towards belt steel surface.
Further, described brush roll is provided with 1-3 couple.
Again further, dispose electronic or hydraulic drive mechanism.
The present invention finds by practical study, and the formation stages of belt steel surface parking spot is mainly in cleaning section, and the main chemical reactions of generation is as follows:
FeCl
2+H
2O=Fe(OH)
2+HCl
Fe(OH)
2+H
2O+1/2O
2=Fe(OH)
3
Fe(OH)
3=FeO(OH)+H
2O
Due to static with steel with acid reactant aqueous solution, at surface deposition one deck containing Fe (OH)
2material, the Fe of generation (OH)
2further with airborne O
2reaction, generates Fe (OH)
3, Fe (OH)
3further there is hydrolysis reaction, finally generate surface darkly or yellow material, after hot blast is air-dry, caused the generation of surperficial parking spot.
Based on above-mentioned parking spot, produce principle, the present invention sprays facing to positive upper surface and lower surface with steel with upper nozzle and lower nozzle when normal production, strong injection is rinsed belt steel surface, and the effect by squeezing roller squeezes out raffinate between two rinse baths, now side spray shower nozzle and brush roll are in stand-by state.When producing shutdown, adopt the mode of side spray facing to band steel spray, the impact of side spray makes belt steel surface be difficult to deposit Fe (OH)
2, and belt steel surface and air are completely cut off, prevent Surface Creation Fe (OH)
3, current can be got rid of from the both sides with steel simultaneously, are conducive to reduce the residual of belt steel surface.When resuming production, now stop side spray, again enabling upper nozzle and lower nozzle sprays facing to positive upper surface and lower surface with steel, and enable the production line brush roll in latter two rinse bath and spray up and down simultaneously, by brush roll and the effect of spray up and down, make a small amount of Fe of belt steel surface (OH)
3remove completely, by the effect of brush roll, can further remove residual that belt steel surface do not remove, reach better cleaning performance.Band steel after spray directly enters air purge and hot blast is air-dry.After band steel in resting on rinse bath passes through completely, the brush roll of stopping using, enabling.
The present invention can eliminate common parking spot, improves the surface quality with steel, has advantages of that cost is low, environmental protection, cleaning efficiency be high, is especially applicable to the production of continuous pickling unit.Apparatus of the present invention have simple in structure, easy to use, operating efficiency advantages of higher.
Accompanying drawing explanation
Fig. 1 is a kind of apparatus structure schematic diagram of eliminating strip pickling parking spot.
Fig. 2 is side spray schematic diagram of the present invention.
Fig. 3 is the schematic diagram of brush roll of the present invention and inclination shower nozzle.
In figure, rinse bath 1, side spray shower nozzle 2, upper nozzle 3, lower nozzle 4, squeezing roller 5, band steel 6, brush roll 7, inclination shower nozzle 8, acid tank 9, current 10.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail:
Embodiment 1
The method of eliminating strip pickling parking spot, comprises the following steps:
1), in production process, band steel arrives rinse baths 1 from acid tank 9, starts upper nozzle 3 and lower nozzle 4 in rinse bath, respectively the upper surface with steel 6 and lower surface is rinsed;
2), the raffinate with steel 6 upper surfaces and lower surface squeezes out by the squeezing roller arranging in pairs up and down 5 effects between two adjacent rinse baths 1;
3), while produce shutting down, upper nozzle 3 and lower nozzle 4 are stopped using, and open a plurality of side spray shower nozzles 2 on rinse bath 1 sidewall, it is 0.5-50Bar that pressure is swept in the spray of side spray shower nozzle 2, by the impact of spraying pressure, avoids belt steel surface deposition Fe (OH)
2, and belt steel surface and air are completely cut off, reduce Surface Creation Fe (OH)
3; Side spray shower nozzle 2 is used de-salted water to purge band steel 6, and desalination electrical conductivity of water is 5～50 μ s/cm, and the oxygen level of de-salted water is less than 5ppm, and the temperature of de-salted water is 5～30 ℃, and current 10 spraying pressures that de-salted water produces are 0.5～10Bar;
4), when resuming production, side spray shower nozzle 2 is stopped using, enabling 4 pairs of band steel 6 upper and lower surfaces of upper nozzle 3 and lower nozzle sprays, and start and be arranged on the brush roll 7 in 1-2 the rinse bath 1 in steel 6 exits simultaneously, and brush roll 7 is towards the inclination shower nozzle 8 arranging with steel 6 traffic direction sides, by the spray effect of inclination shower nozzle 8, and after brush roll 7 brushes off the material of belt steel surface, a small amount of Fe of belt steel surface (OH)
3remove completely;
5) the band steel 6, by brush roll 7 and after spraying enters in air and purges, then air-dry by hot blast, and after the band steel 6 in resting on rinse bath 1 passes through completely, the brush roll 7 of stopping using, returns to normal production.
The method of eliminating strip pickling parking spot, comprises the following steps:
1), in production process, band steel 6 arrives rinse baths 1 from acid tank 9, starts upper nozzle 3 and lower nozzle 4 in rinse bath, respectively the upper surface with steel 6 and lower surface is rinsed;
2), the raffinate with steel 6 upper surfaces and lower surface squeezes out by the squeezing roller arranging in pairs up and down 5 effects between two adjacent rinse baths 1;
3), while produce shutting down, upper nozzle 3 and lower nozzle 4 are stopped using, and open a plurality of side spray shower nozzles 2 on rinse bath 1 sidewall, it is 0.5-50Bar that pressure is swept in the spray of side spray shower nozzle 2, by the impact of spraying pressure, avoids belt steel surface deposition Fe (OH)
2, and belt steel surface and air are completely cut off, reduce Surface Creation Fe (OH)
3; Side spray shower nozzle 2 is used protective gas N
2, CO
2, a kind of in Ar purge band steel 6, the pressure of protective gas is 0.5～50Bar, temperature is 5～30 ℃, gas dew point≤0 ℃;
4), when resuming production, side spray shower nozzle 2 is stopped using, enabling 4 pairs of band steel 6 upper and lower surfaces of upper nozzle 3 and lower nozzle sprays, and start and be arranged on the brush roll 7 in 1-2 the rinse bath 1 in steel 6 exits simultaneously, and brush roll 7 is towards the inclination shower nozzle 8 arranging with steel 6 traffic direction sides, by the spray effect of inclination shower nozzle 8, and after brush roll 7 brushes off the material of belt steel surface, a small amount of Fe of belt steel surface (OH)
3remove completely;
5), by brush roll 7 brush and spray after band steel 6 enter in air and purge, then air-dry by hot blast, after the band steel 6 in resting on rinse bath 1 passes through completely, the brush roll 7 of stopping using, returns to normal production.
Realize the device of above-mentioned elimination strip pickling parking spot method, comprise a plurality of side spray shower nozzles 2 that are arranged on each rinse bath 1 sidewall, a plurality of side spray shower nozzles 2 lay respectively at the both sides of steel 6 and are up and down and are interspersed; Also be included in the upper nozzle 3 and the lower nozzle 4 that with above steel 6 upper surfaces and lower surface below, arrange respectively in each rinse bath 1, and being arranged at least one pair of squeezing roller 5 between every two adjacent rinse baths 1, every pair of squeezing roller 5 lays respectively at band steel 6 above and belows and is close to band steel 6 surfaces; And be arranged on the brush roll 7 in 1-2 the rinse bath 1 in steel 6 exits, brush roll 7 arranges and is provided with 2 pairs in pairs, and every pair of brush roll 7 lays respectively at band steel 6 above and belows and is close to band steel 6 surfaces; Brush roll 7 drives two brush rolls 7 to be provided with inclination shower nozzle 8 towards band steel 6 traffic direction sides by electronic or hydraulic structure, and the nozzle of inclination shower nozzle 8 is towards band steel 6 surfaces.
The elimination strip pickling parking spot device designing for realizing described method, comprises a plurality of rinse baths 1, and is arranged on a plurality of side spray shower nozzles 2 on each rinse bath 1 sidewall, and a plurality of side spray shower nozzles 2 lay respectively at the both sides of steel 6 and are up and down and are interspersed; Also be included in the upper nozzle 3 and the lower nozzle 4 that with above steel 6 upper surfaces and lower surface below, arrange respectively in each rinse bath 1, and being arranged at least one pair of squeezing roller 5 between every two adjacent rinse baths 1, every pair of squeezing roller 5 lays respectively at band steel 6 above and belows and is close to band steel 6 surfaces; And be arranged on the brush roll 7 in 1-2 the rinse bath 1 in steel 6 exits, brush roll 7 arranges in pairs, and every pair of brush roll 7 lays respectively at band steel 6 above and belows and is close to band steel 6 surfaces; The brush roll 7 arranging is in pairs provided with inclination shower nozzle 8 towards the side with steel 6 traffic directions, and the nozzle of inclination shower nozzle 8 is towards band steel 6 surfaces.Brush roll 7 is provided with 1-3 couple.Brush roll 7 disposes electronic or hydraulic drive mechanism.
This device installs side-spraying device additional in each cleaning section, and in the end a cleaning section installs brushing device additional, by side-spraying device to belt steel surface continuous water spray, make the material of Surface Creation be difficult to deposition, and adopt the brush roll that cleans back segment that this layer of material of belt steel surface brushed off, thereby reach the object of completely clean belt steel surface, the generation of the spot that prevents from stopping.The device of the application of the invention, can eliminate common parking spot, improves the surface quality with steel, and this device has simple in structure, easy to use, operating efficiency advantages of higher.
Claims (8)
1. a method of eliminating strip pickling parking spot, is characterized in that: the method comprises the following steps:
1), in production process, band steel (6) arrives after rinse bath (1), starts upper nozzle (3) and lower nozzle (4) in rinse bath (1), respectively upper surface and the lower surface of band steel (6) is rinsed;
2) raffinate of band steel (6) upper surface and lower surface squeezes out by the squeezing roller (5) arranging the in pairs up and down effect between two adjacent rinse baths (1);
3) produce while shutting down; upper nozzle (3) and lower nozzle (4) are stopped using; open a plurality of side spray shower nozzles (2) on rinse bath (1) sidewall, it is 0.5-50Bar that pressure is swept in the spray of side spray shower nozzle (2), by the impact of spraying pressure, avoids belt steel surface deposition Fe (OH)
2, and belt steel surface and air are completely cut off, reduce Surface Creation Fe (OH)
3;
4) when resuming production, side spray shower nozzle (2) is stopped using, enabling upper nozzle (3) and lower nozzle (4) sprays band steel (6) upper and lower surface, and startup is arranged on the brush roll (7) in 1-2 the rinse bath (1) of being with steel (6) exit simultaneously, and brush roll (7) is towards the inclination shower nozzle (8) of band steel (6) traffic direction side setting, by the spray effect of inclination shower nozzle (8), and after brush roll (7) brushes off the material of belt steel surface, a small amount of Fe of belt steel surface (OH)
3remove completely;
5) by brush roll (7), brush and spray after band steel (6) enter in air and purge, then air-dry by hot blast, after the band steel (6) in resting on rinse bath (1) passes through completely, the brush roll (7) of stopping using, returns to normal production.
2. eliminate according to claim 1 the method for strip pickling parking spot, it is characterized in that: in described step 3), side spray shower nozzle (2) is used de-salted water to purge band steel (6).
3. eliminate according to claim 2 the method for strip pickling parking spot, it is characterized in that: described desalination electrical conductivity of water is 5～50 μ s/cm, the oxygen level of de-salted water is less than 5ppm, and the temperature of de-salted water is 5～30 ℃, and de-salted water spraying pressure is 0.5～10Bar.
4. according to the method for eliminating strip pickling parking spot described in claim 1 or 2 or 3, it is characterized in that: in described step 3), side spray shower nozzle (2) is used protective gas N
2, CO
2, a kind of in Ar purge band steel (6).
5. eliminate according to claim 4 the method for strip pickling parking spot, it is characterized in that: the pressure of described protective gas is 0.5～50Bar, temperature is 5～30 ℃, gas dew point≤0 ℃.
6. one kind for realizing the elimination strip pickling parking spot device that method designs described in claim 1, comprise a plurality of rinse baths (1), and be arranged on a plurality of side spray shower nozzles (2) on each rinse bath (1) sidewall, it is characterized in that: described a plurality of side spray shower nozzles (2) lay respectively at the both sides of band steel (6) and are up and down and are interspersed; Also be included in above band steel (6) upper surface in each rinse bath (1) and the upper nozzle (3) and the lower nozzle (4) that below lower surface, arrange respectively, and being arranged at least one pair of squeezing roller (5) between every two adjacent rinse baths (1), described every pair of squeezing roller (5) lays respectively at band steel (6) above and below and is close to band steel (6) surface; And be arranged on the brush roll (7) in 1-2 the rinse bath (1) of being with steel (6) exit, and described brush roll (7) arranges in pairs, and every pair of brush roll (7) lays respectively at band steel (6) above and below and is close to band steel (6) surface; The brush roll of described paired setting (7) is provided with inclination shower nozzle (8) towards a side of band steel (6) traffic direction, and the nozzle of described inclination shower nozzle (8) is towards band steel (6) surface.
7. elimination strip pickling parking spot device according to claim 6, is characterized in that: described brush roll (7) is provided with 1-3 couple.
8. according to the elimination strip pickling parking spot device described in claim 6 or 7, it is characterized in that: described brush roll (7) disposes electronic or hydraulic drive mechanism.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310597194.3A CN103643248B (en) | 2013-11-22 | 2013-11-22 | Eliminate method and the device of strip pickling parking spot |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310597194.3A CN103643248B (en) | 2013-11-22 | 2013-11-22 | Eliminate method and the device of strip pickling parking spot |
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| Publication Number | Publication Date |
|---|---|
| CN103643248A true CN103643248A (en) | 2014-03-19 |
| CN103643248B CN103643248B (en) | 2016-03-02 |
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ID=50248526
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|---|---|---|---|
| CN201310597194.3A Expired - Fee Related CN103643248B (en) | 2013-11-22 | 2013-11-22 | Eliminate method and the device of strip pickling parking spot |
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|---|---|
| CN (1) | CN103643248B (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109321928A (en) * | 2018-11-24 | 2019-02-12 | 崔国辉 | A kind of super austenitic stainless steel volume continuous acid-washing method |
| CN111893501A (en) * | 2020-09-08 | 2020-11-06 | 马钢(合肥)板材有限责任公司 | Device and method for eliminating pickling parking spots |
| CN112318379A (en) * | 2020-09-27 | 2021-02-05 | 山西太钢工程技术有限公司 | Surface treatment apparatus and surface treatment method for hot rolled plate |
| CN113351644A (en) * | 2021-05-31 | 2021-09-07 | 北京首钢股份有限公司 | Method for reducing occurrence rate of corrosion on surface of pickled plate |
| CN114134508A (en) * | 2021-11-23 | 2022-03-04 | 鞍钢联众(广州)不锈钢有限公司 | Method for improving corrosion defects of 400-series steel grades |
| CN114737196A (en) * | 2021-01-07 | 2022-07-12 | 江苏创泰特钢制品有限公司 | Production method of softened steel strip |
| CN115074741A (en) * | 2022-06-15 | 2022-09-20 | 本钢板材股份有限公司 | Process for removing scale by acid washing |
| CN115261877A (en) * | 2022-08-29 | 2022-11-01 | 穆永乐 | Device and method for eliminating strip steel pickling stop spots of continuous pickling line |
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| EP1277528A2 (en) * | 2001-07-21 | 2003-01-22 | Sundwig-Kohler GmbH | Washing machine for metal strips |
| JP2006045594A (en) * | 2004-08-02 | 2006-02-16 | Daido Plant Kogyo Kk | Steel strip washing device |
| EP2581474A1 (en) * | 2011-10-14 | 2013-04-17 | Siemens VAI Metals Technologies GmbH | Method and device for treating a metal strip |
-
2013
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Patent Citations (3)
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| EP1277528A2 (en) * | 2001-07-21 | 2003-01-22 | Sundwig-Kohler GmbH | Washing machine for metal strips |
| JP2006045594A (en) * | 2004-08-02 | 2006-02-16 | Daido Plant Kogyo Kk | Steel strip washing device |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109321928A (en) * | 2018-11-24 | 2019-02-12 | 崔国辉 | A kind of super austenitic stainless steel volume continuous acid-washing method |
| CN111893501A (en) * | 2020-09-08 | 2020-11-06 | 马钢(合肥)板材有限责任公司 | Device and method for eliminating pickling parking spots |
| CN112318379A (en) * | 2020-09-27 | 2021-02-05 | 山西太钢工程技术有限公司 | Surface treatment apparatus and surface treatment method for hot rolled plate |
| CN114737196A (en) * | 2021-01-07 | 2022-07-12 | 江苏创泰特钢制品有限公司 | Production method of softened steel strip |
| CN113351644A (en) * | 2021-05-31 | 2021-09-07 | 北京首钢股份有限公司 | Method for reducing occurrence rate of corrosion on surface of pickled plate |
| CN114134508A (en) * | 2021-11-23 | 2022-03-04 | 鞍钢联众(广州)不锈钢有限公司 | Method for improving corrosion defects of 400-series steel grades |
| CN115074741A (en) * | 2022-06-15 | 2022-09-20 | 本钢板材股份有限公司 | Process for removing scale by acid washing |
| CN115074741B (en) * | 2022-06-15 | 2023-05-26 | 本钢板材股份有限公司 | Pickling and rust removing process |
| CN115261877A (en) * | 2022-08-29 | 2022-11-01 | 穆永乐 | Device and method for eliminating strip steel pickling stop spots of continuous pickling line |
| CN115261877B (en) * | 2022-08-29 | 2023-12-08 | 粤海中粤(中山)马口铁工业有限公司 | Device and method for eliminating strip steel pickling stop spots by continuous pickling line |
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|---|---|
| CN103643248B (en) | 2016-03-02 |
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Effective date of registration: 20170717 Address after: 430083, Hubei Wuhan Qingshan District Factory No. 2 Gate joint stock company organs Patentee after: Wuhan iron and Steel Company Limited Address before: 15 Wuchang, Wuhan Friendship Avenue, No. 999, block A, layer (Wuhan Iron and steel science and technology innovation department), No. 430080, Patentee before: Wuhan Iron & Steel (Group) Corp. |
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