CN1472019A - Thin-belt continuous casting method and apparatus - Google Patents
Thin-belt continuous casting method and apparatus Download PDFInfo
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- CN1472019A CN1472019A CNA021363048A CN02136304A CN1472019A CN 1472019 A CN1472019 A CN 1472019A CN A021363048 A CNA021363048 A CN A021363048A CN 02136304 A CN02136304 A CN 02136304A CN 1472019 A CN1472019 A CN 1472019A
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- cast strip
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Abstract
A conticasting technology for thin steel band includes such steps as filling molten steel in the molten bath formed by crystallizing rollers, cooling and slight rolling by crystallizing rollers, blowing gas onto both surfaces of cast band for forced cooling, hot rolling, controlled cooling and winding. Its apparatus is composed of two blowing mechanisms, connecting-rod driver unit and synchronizing unit. Its advantages are high quality of product and high productivity.
Description
Technical field
The present invention relates to thin strap continuous casting technology and equipment and technology, particularly continuous casting of thin strip cooling control and device.
Background technology
Thin strap continuous casting is the new technology that directly pouring molten steel is become the 1-5mm strip.At present the basic craft course of thin strap continuous casting is: crystallization roll thin-belt continuous casting machine (two rollers, single roller, tyre type)-confined chamber-kink-pinch-hot rolling (single chassis or two frames or nothing)-control is cold-and batches.
The subject matter of this technology existence is at present:
1. solidify terminal point control difficulty.Traditional casting process, continuous casting billet just solidifies fully through crystallizer, two cold, air cooling zone, liquid core length 23000-30000mm, as long as technique change such as pulling rate, steel grade, casting and secondary cooling system are controlled in certain scope just passable to the influence of solidifying terminal point, therefore the flexibility of producing is good, easily control.And the thin strap continuous casting liquid core length has only 250-350mm, and production process will be with the freezing point basic controlling at the contact point place.This brings difficulty with regard to the industrialization of giving thin strap continuous casting.
2. quality instability.Thin strap continuous casting can not complete business-like main cause be the casting strip quality instability still at present.Main Quality is surperficial transverse fissure, lobe and inner shrinkage porosite, shrinkage cavity etc.This be because: (1) thin strap continuous casting is because cooling is fast, and solidified structure is column crystal substantially.After Cast Strip 15 goes out crystallization roller 5 contact point A, see Fig. 1, because does not solidify as yet fully at the center, Cast Strip, the molten metal that solidifies the enrichment of dendrite front end solute solidifies at the center, Cast Strip because flourishing column crystal makes its feeding difficulty, forms shrinkage porosite, shrinkage cavity and segregation easily.(2) technological parameter such as pulling rate, cast temperature all may change according to the condition of production in process of production.The variation of technology makes the change in location of solidifying terminal point.If solidify terminal point in the strip casting process below the contact point of two rollers, bleed-out fracture, shrinkage porosite, shrinkage cavity will take place in the Cast Strip; Otherwise, if solidify terminal point above the contact point of two rollers, roll-force is increased rapidly, the Cast Strip is rolling at high-temperature region fusion two-phase section, and steel substantially in the high-temperature brittleness district longitudinal crack take place very easily, if roll-force makes the overload operation of crystallization roller, meeting generation stall causes production to stop watering even molten steel overflows at the crystallization roller, causes security incident.
3. productivity ratio is low relatively.Though the thin strap continuous casting pulling rate is 50 times of traditional continuous casting, because its thickness is 1/50 of traditional strand, so the yearly output of unit is low.Therefore the pulling rate that improves the Cast Strip just becomes the target that research and development are pursued.After pulling rate improves, Cast Strip time of staying in the crystallization roller is short, the Cast Strip has little time to solidify fully at the contact point place, so easier generation bleed-out, simultaneously since the Cast Strip after going out contact point, the Cast Strip surface temperature is higher, is the zero intensity interval substantially for stainless steel, the Cast Strip easily produces transverse crack under the pulling force effect of gravity and pinch roll.
U.S. Pat 6,273, the disclosed technology of 178B1 are crystallization roller contact point lower end, increase gas quench system, but its gas quench system is the cooling of limit portion.Its purpose mainly is to solve limit, Cast Strip portion crack problem, is not to utilize the section of thought in whole Cast Strip of solidification shrinkage stress to solve freezing problem at all.Its cooling device mainly is that perforate is jet on the iron block of water-cooled in addition, and cooling is difficult for evenly, and tolerance, position are non-adjustable.Be difficult to adapt to expansion product variety and continuous casting process variation.
Japan Patent JP-B-3-33053 has air-cooling apparatus at last confined chamber and following confined chamber, and its main purpose is sealing confined chamber and cooling Cast Strip, is not the control process of setting.
Japan Patent JP-A-5-277654 by the transmission of heat by contact of driven voller and Cast Strip, improves cooling velocity at the driven voller that crystallization roller lower end φ 300-400mm has increased a pair of external diameter φ 200mm.The present invention is different fully with the means that this method adopts, and the present invention takes away heat by the gas cooled mode.The main shortcoming of patent JP-A-5-277654 mode is the speeds match problem that has crystallization roller and pony roll, if mate badly, the Cast Strip is easily reversed or given a discount, the production operation inconvenience; And cooling effect is poor, controls dumb.
To the effect that crystal roller surface being monitored at the different situations of each several part along its length direction of Chinese patent CN1294536A invention, and according to monitoring result to the crystal roller surface different gas of jetting everywhere.Its control thought is the temperature by the crystallization control roller, i.e. casting strip quality is controlled in control once cooling; With air cooling control by crystallization roller body of roll direction, solve the uniformity of crystal roller surface temperature, finally reach the purpose of control casting strip quality; And package unit is to arrange in body of roll direction a series ofly to control by gas mixer chamber, flue and nozzle, and the integral device relative complex especially in the position of last confined chamber, is given and operated and sealing brings difficulty; Especially when the steel accident took place to overflow the crystallization roller, system was with impaired.
Summary of the invention
The objective of the invention is to the Cast Strip solidification end is forced the control of solidifying of cooling, make the Cast Strip produce the heat of solidification shrinkage stress, under the thermal shrinkage stress effect, enlarged and solidified the feeding angle, made molten metal obtain feeding, improved internal soundnesses such as Cast Strip shrinkage porosite, shrinkage cavity and segregation, reduced the Cast Strip temperature simultaneously, avoid the material at high temperature brittle zone, solidify terminal point and can be controlled on a bit, but be controlled at certain scope.Like this, both solve the shortcoming that above-mentioned prior art exists, can improve the pulling rate of Cast Strip simultaneously, enlarged the steel grade scope of continuous casting, improved the flexibility of operation.
For achieving the above object, technical solution of the present invention is:
A kind of method for continuous casting sheet band, molten steel process submersed nozzle enters in the molten bath that is formed by the crystallization roller that rotates at a high speed, through the cooling and the slight rolling formation Cast Strip of crystallization roller, cools off until batching through hot rolling, control again; In crystallization roller exit, the Cast Strip that goes out the crystallization roller is carried out blowing gas along the Cast Strip width to the two sides, Cast Strip force cooling, make the Cast Strip be cooled fast to the temperature of technological requirement, obtain surface and the good Cast Strip of internal soundness.
Further, it is on the two sides, Cast Strip that its blowing gas is forced cooling, along the Cast Strip length direction 1～4 row's winding-up assembly is set, as nozzle etc., to the control cooling of jetting of two sides, Cast Strip.
The present invention is used for the control cooling device of thin strap continuous casting, is installed on crystallization roller below, comprises two spraying and blowing organs that set up the continuous casting of thin strip both sides separately, and described spraying and blowing organ comprises bearing block, back shaft, a plurality of nozzle, air supply hose, gas transmission main; Wherein, bearing block is arranged at crystallization roller below; Back shaft is installed in bearing block; A plurality of nozzles are fixedly arranged on back shaft respectively; Air supply hose one end is connected with nozzle, and the other end is connected with gas transmission main; Gas transmission main is connected with air supply system.
Further, also comprise jointed gear unit, comprise connecting rod and driving rod drive; Described connecting rod one end is connected with back shaft, and the other end and driving rod drive flexibly connect, and promotes connecting rod and drives the back shaft revolution, makes the nozzle that is fixedly arranged on the back shaft rotatable.
Also be provided with a synchronous mechanism, comprise two travelling cars and guide wheel, rack and pinion, guide rail, drive car on it are set; Two travelling cars set up the guide rail two ends separately, the bearing block of described two spraying and blowing organs is divided on two travelling cars, wherein a travelling car is connected with drive car by connecting rod, another travelling car meshes by wheel and rack, driven by drive car, thereby two spraying and blowing organs are realized moving relatively or contrarily synchronously.
Described driving rod drive, drive car are that various forms such as cylinder, hydraulic cylinder or electronic cylinder all can.
Major advantage of the present invention has:
1. technology controlling and process is flexible, and is workable.Because the present invention has increased the forced cooling device of solidification end, according to the test result of different process systems in conjunction with Cast Strip surface temperature measurement system, by adjusting refrigerating gas flow and pressure, make the control of solidifying the final position control to a scope control, the flexibility that has improved technology controlling and process greatly from single-point.
2. enlarged the production steel grade.According to the mechanical behavior under high temperature of different steel grades, formulate different cooling control technology, can realize by the angle of adjusting nozzle, the flow and the pressure of gas.Thereby enlarged the type of producing steel grade.
3. improve the Cast Strip internal soundness.Can be according to process system and different production steel grades such as different casting, cast temperatures, arrive the distance of Cast Strip, the technological parameters such as form, gas flow and pressure of nozzle by the control nozzle, form and force cooling, produce the heat of solidification shrinkage stress, make molten metal obtain feeding, thereby improve internal soundness tissues such as Cast Strip shrinkage porosite shrinkage cavity, segregation.
4. reduce bleed-out, improve the face crack of Cast Strip.Owing to adopted the present invention, increased the cooling capacity of Cast Strip and crystallization roller, avoid the generation of bleed-out accident.According to the mechanical behavior under high temperature of different steel grades, by regulating angle, gas flow and the pressure of nozzle, with the control of Cast Strip temperature within the specific limits, improve face crack simultaneously.
5. boost productivity.The pulling rate of thin strap continuous casting further can be improved after adopting the present invention, improved productivity ratio.
6. can reduce cost.Adopt the present invention, strengthened the cooling of crystallization roller and Cast Strip, reach same cooling capacity, can reduce crystallization roller roller footpath, cost of investment that can reduce greatly and maintenance cost.
Description of drawings
Fig. 1 is a twin-roll thin strip continuous casting tandem rolling schematic diagram.
Fig. 2 is Cast Strip cast schematic diagram.
1-ladle 2-long nozzle 3-tundish
4-submersed nozzle 5-crystallization roller 6-platform
7-side seal 8-cooling controller 9-Cast Strip temperature scanning instrument
10-video camera 11-swing guide 12-confined chamber
13-slag car 14-pinch roll 15-Cast Strip
Fig. 3 controls the structural representation of cooling device for the present invention.
16a, 16b-bearing block 17a, 17b-back shaft
18a, 18b-nozzle 19a, 19b-air supply hose
20a, 20b-gas transmission main 21a, 21b-flexible pipe
22,22a-connecting rod 23a, 23b-driving rod drive
24a, 24b-travelling car
25a, 25b-guide wheel 26-connecting rod
27-drive car 28a, 28b-tooth bar
29-guide rail 30-gear
31a, 31b-pressure-regulating valve 32a, 32b-flowmeter
Fig. 4 is that gas flow is to Cast Strip cooling influence.
Fig. 5 controls the nozzle distance Cast Strip of cooling device for the present invention distance influences the Cast Strip cooling.
The specific embodiment
As shown in Figure 2, molten steel S enters in the molten bath that the water-cooled crystallization roller 5 of rotation forms through long nozzle 2, tundish 3 and submersed nozzle 4 from ladle 1, cooling through water-cooled crystallization roller 5 forms Cast Strip 15, by swing guide 11, pinch roll 14 hot rolling is delivered in Cast Strip 15, cool off until batching through hot rolling, control again.
Because Cast Strip 15 reaches more than 1300 ℃ going out crystallization roller 5 place's temperature, the elevated temperature strength of Cast Strip 15 is very low.Cast Strip 15 is easy to occur crackle even bleed-out in the exit under effects such as gravity, pinch roll 14 pulling force.Therefore the present invention carries out different process for cooling by control cooling device 8 is set in crystallization roller 5 exits according to the mechanical behavior under high temperature of different steel grades, reaches the purpose that improves pulling rate and control quality.
As shown in Figure 1 and Figure 2, the present invention is 0-4000mm place below crystallization roller 5 contact point A, is preferably the 0-2000mm place, and 15 two sides in the Cast Strip are provided with control cooling device 8, and 15 whole widths carry out air cooling but to Cast Strip 15 along the Cast Strip, reach control and solidify.Among Fig. 28 is control cooling devices of thin strap continuous casting.Solidify and mechanical behavior under high temperature according to producing product, on the two sides, Cast Strip, 15 length directions are provided with 2 row's winding-up assemblies along the Cast Strip, as nozzle, form 2 winding-up cooling circuits.
Because The whole control cooling device 8 is in confined chamber 12, so cooling medium is inert gas, preferred argon gas and nitrogen, and, select suitable argon gas/nitrogen ratios according to the different mechanicals behavior under high temperature of steel grade.Nozzle 18a, 18b to Cast Strip 15 apart from 50-800mm; Optimum at 50-300mm; Gas pressure is greater than 0.2-1Mpa.
See also Fig. 3, control cooling device of the present invention is installed on crystallization roller 5 belows, comprises two spraying and blowing organs that set up continuous casting of thin strip 15 both sides separately and corresponding connecting rod transmission mechanism, lazy-tongs;
Spraying and blowing organ comprises bearing block 16a, 16b, back shaft 17a, 17b, a plurality of nozzle 18a, 18b, air supply hose 19a, 19b, gas transmission main 20a, 20b; Back shaft 17a, 17b are installed on bearing block 16a, the 16b; Nozzle 18a, 18b are fixedly arranged on back shaft 17a, 17b respectively; Air supply hose 19a, 19b one end are connected with nozzle 18a, 18b, and the other end is connected with gas transmission main 20a, 20b; Gas transmission main 20a, 20b are connected with air supply system by flexible pipe 21a, 21b.
Jointed gear unit comprises connecting rod 22,22a and driving rod drive 23a, 23b; Connecting rod 22a, 22b one end are connected with back shaft 17a, 17b, and the other end and driving rod drive 24a, 24b flexibly connect, and promote connecting rod 22a, 22b and drive back shaft 17a, 17b revolution.
Lazy-tongs comprise two travelling car 24a, 24b and guide wheel 25a, 25b, tooth bar 28a, 28b and gear 30, guide rail 29, drive car 27 on it are set; Two travelling car 24a, 24b set up guide rail 29 two ends separately, bearing block 16a, the 16b of two spraying and blowing organs is installed on two travelling car 24a, the 24b, cooperate with tooth bar 28a, 28b by gear 30, drive car 27 drives, and two spraying and blowing organs are realized moving relatively or contrarily synchronously.Driving rod drive 23a, 23b, drive car 27 are cylinder or hydraulic cylinder.
Two travelling car 24a, the 24b of 15 both sides, Cast Strip moves by same gear 30 and tooth bar 28a, 28b to realize moving relatively or contrarily of while.Wherein a travelling car 24a by drive car 27 push away (drawing) moving, by being installed in the tooth bar 28a driven gear 30 on the travelling car 24a, drive tooth bar 28b by gear 30 again, and tooth bar 28b is mounted on another travelling car 24b, travelling car 24b also is pushed (drawing) action like this.Drive car 27 has displacement transducer, can preset or adjust in real time the distance between nozzle 18a, 18b and the Cast Strip 15.
Travelling car 24a, 24b can move along guide rail 29, so that near or leave Cast Strip 15, therefore the nozzle 18a, the 18b that are installed on back shaft 17a, the 17b can adjust angle with Cast Strip 15 by the revolution of back shaft 17a, 17b, its anglec of rotation is ± 180 °, and the best anglec of rotation is ± 60 °; Back shaft 17a, 17b are installed on travelling car 24a, the 24b by bearing block 16a, 16b, by mobile adjustment nozzle 18a, the 18b of travelling car 24a, 24b and the distance between the Cast Strip 15.
Nozzle 18a, 18b are arranged in crystallization roller 5 belows, the both sides of the Cast Strip 15 in exit, as close as possible Cast Strip.Nozzle 18a, 18b are gas jets, as flat gas jets; The number of nozzle 18a, 18b is determined according to the characteristic and the Cast Strip width of nozzle.Nozzle 18a, 18b can preset and adjust to the spray angle of Cast Strip 15 and with the distance on 15 surfaces, Cast Strip, or adjust in real time according to the test result of the temperature scanning instrument 9 that are provided with in the confined chamber 12.
Nozzle 18a, the 18b gas of 15 both sides, Cast Strip can be controlled respectively.Interior outer arc side intensity of cooling can be adjusted in real time according to actual conditions, and the air supply system gas that is connected with gas transmission main 20a, 20b and flexible pipe 21a, 21b is controlled instrumentations such as comprising flowmeter 31a, 31b and pressure-regulating valve 32a, 32b and by-pass valve control etc.
Back shaft 17a, 17b revolution acts on connecting rod 22a, 22b by driving rod drive 24a, 24b, and driving rod drive 24a, 24b have displacement transducer, so the corner of nozzle 18a, 18b can preset, and also can control in real time.
All rotary parts all adopt rolling bearing and sliding bearing as gear, bearing block, connecting rod transmission etc., and use resistant to elevated temperatures lubricating grease to lubricate, and safety action flexibly, accurately.In order to prevent the Cast Strip hyperthermia radiation, driving rod drive 24a, 24b, drive car 27 also are provided with heat shield.
If abnormal conditions such as bleed-out and Cast Strip skew take place, in process of production according to video cameras 10 (seeing among Fig. 2) in the confined chamber 12, nozzle 18a, 18b can be under the effect of drive car 27 the quick rollback of level, avoid equipment to be damaged.
Fig. 4 and Fig. 5 are after adopting technology of the present invention, gas flow and apart from the distance of Cast Strip to Cast Strip cooling influence.As shown in the figure, adopt the technology of the present invention, adopt rational gas flow and suitable distance according to different technology conditions, cooling velocity increases nearly 1 times, and result of use is very obvious.
Disclosed patent different from the past and technical literature, the present invention is applicable to the metal Cast Strip with two rollers, single roller, roller belt-type strip caster cast thickness 1-10mm.
Claims (15)
1. method for continuous casting sheet band, molten steel enters in the molten bath that the crystallization roller by rotation at a high speed forms through submersed nozzle, through the cooling and the slight rolling formation Cast Strip of crystallization roller, cools off until batching through hot rolling, control again; It is characterized in that,, the Cast Strip that goes out the crystallization roller is carried out blowing gas along the Cast Strip width to the two sides, Cast Strip force cooling, make the Cast Strip be cooled fast to the temperature of technological requirement, obtain surface and the good Cast Strip of internal soundness in crystallization roller exit.
2. method for continuous casting sheet band as claimed in claim 1 is characterized in that, 0-4000mm place below crystallization roller contact point carries out blowing gas to the Cast Strip that goes out the crystallization roller along the Cast Strip width and forces cooling.
3. method for continuous casting sheet band as claimed in claim 1 is characterized in that, 0-2000mm place below crystallization roller contact point carries out blowing gas to the Cast Strip that goes out the crystallization roller along the Cast Strip width and forces cooling.
4. method for continuous casting sheet band as claimed in claim 1 is characterized in that, described blowing gas is nitrogen or inert gas.
5. method for continuous casting sheet band as claimed in claim 1 is characterized in that, on the two sides, Cast Strip, along the Cast Strip length direction 1～4 row's winding-up assembly is set.
6. method for continuous casting sheet band as claimed in claim 1 is characterized in that, blowing gas pressure is 0.2～1Mpa.
7. method for continuous casting sheet band as claimed in claim 1 is characterized in that, the winding-up assembly is to the distance 50～800mm of Cast Strip.
8. method for continuous casting sheet band as claimed in claim 1 is characterized in that, the winding-up assembly is to the optimum distance 50～300mm of Cast Strip.
9. the control cooling device that is used for thin strap continuous casting is installed on crystallization roller below, it is characterized in that, comprises two spraying and blowing organs that set up the continuous casting of thin strip both sides separately, and described spraying and blowing organ comprises,
Bearing block is arranged at crystallization roller below;
Back shaft is installed in bearing block;
A plurality of nozzles are fixedly arranged on back shaft respectively;
Air supply hose, an end is connected with nozzle, and the other end is connected with gas transmission main;
Gas transmission main is connected with air supply system.
10. control cooling device as claimed in claim 9 is characterized in that, also comprises jointed gear unit, comprises connecting rod and driving rod drive; Described connecting rod one end is connected with back shaft, and the other end and driving rod drive flexibly connect, and promotes connecting rod and drives the back shaft revolution, makes the nozzle that is fixedly arranged on the back shaft rotatable.
11., it is characterized in that described nozzle is a gas jets as claim 9 or 10 described control cooling devices.
12., it is characterized in that described nozzle is flat gas jets as claim 9 or 10 described control cooling devices.
13. control cooling device as claimed in claim 10 is characterized in that, the described nozzle anglec of rotation is ± 180 °, and the best anglec of rotation is ± 60 °.
14. control cooling device as claimed in claim 9 is characterized in that, also is provided with a synchronous mechanism, comprises two travelling cars and guide wheel, rack and pinion, guide rail, drive car on it are set; Two travelling cars set up the guide rail two ends separately, the bearing block of described two spraying and blowing organs is divided on two travelling cars, wherein a travelling car is connected with drive car by connecting rod, another travelling car meshes by wheel and rack, driven by drive car, thereby two spraying and blowing organs are realized moving relatively or contrarily synchronously.
15., it is characterized in that described driving rod drive, drive car are cylinder, hydraulic cylinder or electronic cylinder etc. as claim 9 or 10 described control cooling devices.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02136304 CN1208155C (en) | 2002-07-30 | 2002-07-30 | Thin-belt continuous casting method and apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02136304 CN1208155C (en) | 2002-07-30 | 2002-07-30 | Thin-belt continuous casting method and apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1472019A true CN1472019A (en) | 2004-02-04 |
| CN1208155C CN1208155C (en) | 2005-06-29 |
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ID=34146403
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02136304 Expired - Lifetime CN1208155C (en) | 2002-07-30 | 2002-07-30 | Thin-belt continuous casting method and apparatus |
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| Country | Link |
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| CN (1) | CN1208155C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101367117B (en) * | 2007-08-17 | 2010-12-15 | 宝山钢铁股份有限公司 | On-line surface treating method for crystallization roller of thin belt continuous casting process |
| CN102002628B (en) * | 2009-08-31 | 2012-07-25 | 宝山钢铁股份有限公司 | Method for manufacturing low-carbon steel sheets |
| WO2018119548A1 (en) * | 2016-12-26 | 2018-07-05 | 普锐特冶金技术日本有限公司 | Sealing method, sealing device, and continuous casting apparatus provided with the sealing device |
| CN111822663A (en) * | 2019-04-17 | 2020-10-27 | 青岛九环新越新能源科技股份有限公司 | Continuous production method of composite metal belt |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100493745C (en) * | 2006-06-23 | 2009-06-03 | 宝山钢铁股份有限公司 | Method for continuously casting sheet band by dual roller |
-
2002
- 2002-07-30 CN CN 02136304 patent/CN1208155C/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101367117B (en) * | 2007-08-17 | 2010-12-15 | 宝山钢铁股份有限公司 | On-line surface treating method for crystallization roller of thin belt continuous casting process |
| CN102002628B (en) * | 2009-08-31 | 2012-07-25 | 宝山钢铁股份有限公司 | Method for manufacturing low-carbon steel sheets |
| WO2018119548A1 (en) * | 2016-12-26 | 2018-07-05 | 普锐特冶金技术日本有限公司 | Sealing method, sealing device, and continuous casting apparatus provided with the sealing device |
| CN111822663A (en) * | 2019-04-17 | 2020-10-27 | 青岛九环新越新能源科技股份有限公司 | Continuous production method of composite metal belt |
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| Publication number | Publication date |
|---|---|
| CN1208155C (en) | 2005-06-29 |
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