CN201283419Y - Movable spraying rack for secondary auxiliary cooling of slab casting machine sector segment - Google Patents
Movable spraying rack for secondary auxiliary cooling of slab casting machine sector segment Download PDFInfo
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- CN201283419Y CN201283419Y CNU2008201532373U CN200820153237U CN201283419Y CN 201283419 Y CN201283419 Y CN 201283419Y CN U2008201532373 U CNU2008201532373 U CN U2008201532373U CN 200820153237 U CN200820153237 U CN 200820153237U CN 201283419 Y CN201283419 Y CN 201283419Y
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Abstract
The utility model provides a movable spraying frame which is used for secondary auxiliary cooling as a fan section of a plate blank hot-rolling continuous casting machine. The movable spraying frame enables a secondary cooling nozzle to have the automatic adjusting ability in the on-line cooling range on a secondary cooling zone fan-shaped section and in particular on the fan-shaped section in the earlier stage of casting blank solidification period. The movable spraying frame can realize that the spraying width of the nozzle can be adjusted on line in real time on the casting blank width direction through a rational connecting rod lifting structure, namely, the height and the width of the secondary cooling nozzle can be automatically and rapidly switched according to the casting blank molding specifications, good shearing precision can be guaranteed, simultaneously, the composite degree of a spraying pipeline system can be greatly reduced, and secondary cooling water quantity can be saved on certain degree. The spraying effect of a secondary cooling spraying system can be flexibly controlled and improved through using the device, rational spraying and cooling technique on the casting blank surface can be realized, and the defects of casting blank due to non-matching of the secondary cooling technique can be prominently lowered.
Description
Technical field
The utility model relates to field of metallurgy, and particularly, the utility model relates to a kind of cooling device of slab hot rolling conticaster, and more specifically, the utility model relates to a kind of auxiliary cooling of secondary (two is cold) as slab hot rolling continuous casting machine fan-shaped segment and sprays frame with activity.Described movable spray frame can make in two cool region fan-shaped section, especially has the automatic adjustment capability of online cooling range at casting blank solidification fan-shaped section di-cold spray nozzle in earlier stage.
Background technology
The two cold water spray systems in the segmental arc zone of current vertical bending type slab caster are made up of single 8～11 nozzles usually, the spray system of this routine is because nozzle is too many, and each row's nozzle all needs independently air feed, water system, for this reason, make the composition form of this independently supplying directly cause the equipment of two cold pipelines huge and complicated.
Because the width specifications of current slab caster is switched frequent, above-mentioned this complexity, multi-jet spray system are difficult to satisfy the requirement that the frequent width specifications of current slab caster is switched.According to the order demand of downstream hot rolling, when the casting width of casting machine from large to small the time, current conventional spray system has only by the local nozzle of closed edge portion and guarantees the precision that the width of cloth is cut.Yet the discrete layout of nozzle and strand width are adjusted the matched well that is difficult to guarantee between the two on a large scale, and the precision that causes the width of cloth to cut is overproof.The width of cloth is cut precision and is difficult to guarantee to be the one of the main reasons that causes defectives such as slab chink, 1/4 district's crackle, has had a strong impact on the rate of becoming a useful person of product.
To this, the disclosed a kind of movable spray equipment that utilizes a pair of Propeling Equipment Control of Chinese patent " CN200960545 ", this device can be adjusted technological parameters such as distance between nozzle and the strand, angle to a certain extent, but this device only is confined to square billet and round billet continuous casting, uses and can't carry out industrialization on slab.
United States Patent (USP) " US4256168A " discloses a kind of nozzle adjusting device that utilizes double link to combine with the leading screw slide block, this device can suitably be adjusted distance and spray scope between nozzle and the slab according to casting blank specification, can rationally control the spray width of cloth of strand and cut width.Yet this device must extra installation one overlap mechanical manual executing agency in the side of casting machine fan-shaped section, and this mechanism seems very difficult for the compact Layout requirement of conticaster actual production.Simultaneously, the workman must change casting machine over to and carry out manual adjustments when the casting machine specification is switched, and the amplitude of accommodation is difficult to accurate assurance.Thereby, make this invention also can't satisfy the technological requirement that current supermatic continuous casting is produced fully.
For guaranteeing as realizing good coupling between the spray width of slab hot rolling continuous casting machine fan-shaped segment di-cold spray nozzle and the strand width, the height of di-cold spray nozzle, width adjustment must onlinely automatically switch according to strand casting specification in real time fast, and require can be good to guarantee that the width of cloth is cut precision not overproof, to improve two cold cooling effects.
The utility model content
For overcoming above-mentioned shortcoming, the utility model provides a kind of auxiliary cooling of secondary (two is cold) as slab hot rolling continuous casting machine fan-shaped segment to spray frame with activity.Described movable spray frame can make in two cool region fan-shaped section, especially the automatic adjustment capability that has online cooling range at casting blank solidification fan-shaped section di-cold spray nozzle in earlier stage, can be online real-time according to the strand casting specification chilling spray scope that automaticallyes switch fast, and require can be good to guarantee that the width of cloth is cut precision not overproof, to improve two cold cooling effects.
For achieving the above object, be the on-line automatic adjustment of spray width that realizes di-cold spray nozzle, the auxiliary cooling of the secondary of slab hot rolling continuous casting machine fan-shaped segment of the present utility model is as follows with the technical scheme of movable spray frame.
The auxiliary cooling of a kind of secondary of slab hot rolling continuous casting machine fan-shaped segment comprises with movable spray frame: nozzle, and the intermediate arm that is used for support nozzle and oblique arm and be connected the hydraulic cylinder of nozzle is characterized in that,
Nozzle is provided with three tunnel, one tunnel nozzle support on intermediate arm, and two road nozzles are supported in respectively on two oblique arms that are slidingly connected with intermediate arm in addition, and described spray frame also comprises:
Be arranged at the first straight-arm slide block and the angled-lift splits that is arranged on the oblique arm on the above-mentioned intermediate arm respectively, described slide block can slide along wall,
Control control system in oil supply system that is connected with hydraulic cylinder and the continuous casting respectively,
Be sheathed on the oblique arm, be positioned at the spring of slide block top,
Be sheathed on the intermediate arm, lay respectively at above the slide block and the spring of below,
The pressure head that is connected with the piston rod of hydraulic cylinder bottom,
The sensor that is connected with the hydraulic cylinder signal.
According to the utility model, be about to di-cold spray nozzle and change single three road nozzles into, and three road nozzles are installed on respectively on the spray frame, by the testing result of sensor and the cooling requirement of middle control secondary cooling system, and the hydraulic cylinder stroke in the online adjustment automatic extending-contracting apparatus, reach the enforcement adjustment capability of the spray width of single three road nozzles, guarantee to spray between width and the strand width and reach matched well, realize that the width of cloth cuts the good control of precision.
In addition, the testing range of the displacement transducer 22 at described hydraulic cylinder 7 tops can the covering liquid cylinder pressure whole path increment, the accuracy of detection of sensor 22 is higher than the millimeter level simultaneously, all springs 4,1-1 and 1-2 in described spray equipment are compressive state when mounted, to guarantee that all briquettings can keep good stable during stable spray, angled-lift splits 3, the first straight-arm slide block 2-1 and the oblique arm 6 in described spray equipment, the lubricating status between the intermediate arm 1 must keep good.
The auxiliary cooling of secondary of the present utility model applies to arc two cold-zones after conticaster goes out crystallizer with the movable frame that sprays.
With movable spray frame, it is characterized in that in described spray equipment, angled-lift splits carries out hinged the connection with the straight-arm slide block by two connecting rods according to the auxiliary cooling of the secondary of slab hot rolling continuous casting machine fan-shaped segment of the present utility model.
With movable spray frame, it is characterized in that in described spray equipment, the piston rod and the pressure head of hydraulic cylinder 7 bottoms are rigidly connected according to the auxiliary cooling of the secondary of slab hot rolling continuous casting machine fan-shaped segment of the present utility model.
, it is characterized in that with movable spray frame according to the auxiliary cooling of the secondary of slab hot rolling continuous casting machine fan-shaped segment of the present utility model, in described spray equipment, hydraulic cylinder brace table and ribs thereof are set.
Thus, during at fixer cylinder pressure 7, can guarantee that hydraulic cylinder 7 and piston rod 23 can keep stablizing erectility, guarantee that piston rod 23 can not cause pressure head and intermediate arm 1 stuck because of deflection in the running up and down at described hydraulic cylinder brace table 11.
According to the utility model, when simplifying two cool equipment systems greatly, improved the matching capacity between spray width and the strand width greatly, can effectively reduce strand because the unreasonable a series of casting blank defects that cause of cooling.
With movable spray frame, it is characterized in that in described spray equipment, all devices comprise that spring, slide block, arm etc. all need adopt acid corrosion-resistant high-quality stainless steel according to the auxiliary cooling of the secondary of slab hot rolling continuous casting machine fan-shaped segment of the present utility model.
Thus, make the auxiliary cooling of secondary of the present utility model can resist thermal deformation with movable spray frame.
Auxiliary cooling sprays frame with activity according to the secondary of slab hot rolling continuous casting machine fan-shaped segment of the present utility model, it is characterized in that, in described spray equipment, except that spray house steward and nozzle, all devices comprise that spring, slide block, arm etc. all impose and add water vapor seal.
Thus, avoid causing the device premature failure because of the intrusion of continuous casting steam.
With movable spray frame, it is characterized in that the first straight-arm slide block 2-1 rising slippage L1 according to the auxiliary cooling of the secondary of slab hot rolling continuous casting machine fan-shaped segment of the present utility model〉the second straight-arm slide block 2-2 rising slippage L2.
Make the spring rate of two the spring 1-1 up and down of the described first straight-arm slide block 2-1 and 1-2 inconsistent, the rigidity of spring 1-2 is lower than the rigidity of spring 1-1, thus, guarantees the height of intermediate noxzzle and the nozzle height coupling of oblique arm upper support.
Assist cooling with movable spray frame according to the secondary of slab hot rolling continuous casting machine fan-shaped segment of the present utility model, it is characterized in that the spray angle commensurate in scope of angle between described both sides oblique arm and the intermediate arm and nozzle is arranged on 45～60 scopes of spending.
Thus, guarantee that the spray scope of angled-lift splits 3 when tilting to rise certain stroke can form matched well with the nozzle 21 of intermediate arm.
With movable spray frame, it is characterized in that in described spray equipment, three road nozzles are supported on intermediate arm and two oblique arms by the shower water arm respectively according to the auxiliary cooling of the secondary of slab hot rolling continuous casting machine fan-shaped segment of the present utility model.
According to the utility model, this novel activity spray frame can require according to the strand width specifications of slab caster carry out online adjustment, when guaranteeing that the strand width of cloth is cut precision, can be well the casting billet surface of Nominal Width be carried out the cover type spray and cools off.The online adjustment that this novel movable spray frame can be implemented the online scope of cooling capacity flexibly, secondary cooling water amount and tolerance by the displacement transducer and the middle control two cold control systems at jacking hydraulic cylinder top, reach secondary cooling system and can switch the spray cooling range according to product specification, realize matched adjustment fast, when reducing the complexity of two cool equipment systems greatly, guarantee efficient, accurate two cold water spray abilities, can effectively improve strand because the slab quality that the matching problem of two cold but abilities causes.
The simple declaration of accompanying drawing
Figure 1A, B are respectively the fundamental diagram of the auxiliary cooling of secondary of the present utility model with movable spray frame.
Fig. 2 A, B are respectively the auxiliary cooling of described secondary with the intermediate arm of movable spray equipment and spray the exploded view of bracing frame.
Fig. 3 is the installation diagram of above-mentioned spray bracing frame.
Fig. 4 A, B are respectively the schematic perspective view of above-mentioned spray bracing frame and hydraulic cylinder.
Fig. 5 is the general assembly system of the auxiliary cooling of the secondary of slab hot rolling continuous casting machine fan-shaped segment with movable spray frame activity spray system.
Fig. 6 is the 3-D view of described activity spray system when the narrow strand of spray.
Fig. 7 is the 3-D view of described activity spray system when the wide strand of spray.
Among the figure, 1 is intermediate arm, 1-1,1-2 is respectively the spring that is positioned at first straight-arm slide block 2-1 top and below, 2-1 is the first straight-arm slide block on the intermediate arm, and 3 is the angled-lift splits on the oblique arm 6, and 4 is the spring on the oblique arm, 5 is bracing frame, and 6 is oblique arm, and 7 is hydraulic cylinder, 8 is connecting rod, 9 are the spray pallet, and 10 are the spray stand, and 11 is the hydraulic cylinder brace table, 12 is ribs, 13 is pressure head, and 14 is the displacement signal line, and 15 is oil discharge pipe, 16 is fuel feed pump, 17 is oil supply system, and 18 is to control control system, 19 in the continuous casting, 20 are respectively the shower water arm, 21 is nozzle, 22 is sensor, and 23 is hydraulic cylinder piston rod, and 24 is strand, 25 is two cold external hoses, and 26 is the shower water house steward.
The specific embodiment
Below, with reference to accompanying drawing, specify movable spray equipment of the present utility model.
Movable spray equipment principle of the present utility model mainly comprises as shown in Figure 1: compositions such as oblique arm 6, slide block 3, connecting rod 8, hydraulic cylinder 7, nozzle 21; As Fig. 2～shown in Figure 6, practical structures must comprise: control control system 18, hydraulic cylinder 7, intermediate arm 1, oblique arm 6, spring 4,1-1,1-2, angled-lift splits 3, the first straight-arm slide block 2-1, fuel feed pump 16, oil discharge pipe 15, pressure head 13, hydraulic cylinder brace table 11, ribs 12, sensor 22, displacement signal line 14 etc. in oil supply system 17, the continuous casting.Wherein angled-lift splits 3 carries out hinged the connection with the first straight-arm slide block 2-1 by two connecting rods 8, realizes that moving up and down of straight-arm slide block 3 can in time drive 3 one of angled-lift splitses and move up and down; The piston rod 23 and the pressure head 13 of hydraulic cylinder 7 bottoms are rigidly connected, and drive pressure head 13 and move up and down when piston rod 23 moves up and down.
The action form of the utility model structure can be referring to Fig. 2～Fig. 6.
The real-time width adjusting process of spray nozzle is to realize in the following way: at first, when casting machine during at the strand 24 of casting under a certain width, hydraulic cylinder 7 is controlled under the lock program of control system 18 in continuous casting, fixed-site by oil supply system 17 locking hydraulic cylinders 7 piston rods 23, piston rod 23 because with being rigidly connected of pressure head 13, the locking position that causes pressure head 13 is on the height of the regulation of intermediate arm 1.At this moment, pressure head 13 firmly is fixed on the first straight-arm slide block 2-1 on certain height of intermediate arm 1 by two holddown spring 1-1 and 1-2, intermediate arm 1 is fixed on two angled-lift splitses 3 on the operational height of oblique arm 6 by two connecting rods 8 simultaneously, thereby good control the height and the width of nozzle 21, realized the stable spray ability of nozzle 21 on certain width.
When casting machine carries out the specification switching of strand 24, for example when the width of strand 24 increases, control control system 18 calculates the width of cloth and cuts width and reasonably spray width at once according to the width levels of the strand 24 after changing in the continuous casting, sends the oil-feed instruction of the dummy ingot amount of feeding at once to oil supply system 17.
At this moment, oil supply system 17 is passed through oil inlet pipe 16 at once to hydraulic cylinder 7 fuel feeding under this instruction, open the emptying valve simultaneously, allows the rodless cavity hydraulic oil of hydraulic cylinder 7 inside pass through oil discharge pipe 15 timely to oil supply system 17 emptyings.
Supply with in the oily process at this, piston rod 23 rises, and this uphill process drives pressure head 13 by being rigidly connected and rises synchronously together.Pressure head 13 because with straight-arm slide block 2-1 between adopt holddown spring 1-2 to be connected, the upper surface of the first straight-arm slide block 2-1 is connected with the end face employing another one holddown spring 1-1 of bracing frame 5 simultaneously.Owing to the spring rate of two spring 1-1 and 1-2 is inconsistent, therefore when the certain rising slippage L1 of pressure head 13 generations, the first straight-arm slide block 2-1 produces and spring 1-1, rising slippage L2 that the 1-2 spring rate is relevant at once, simultaneously, the first straight-arm slide block 2-1 drives angled-lift splits 3 up-slip on oblique arm 6 by two connecting rods 8 in uphill process.The vertical motion of three road slide blocks 3,6 drives spray house steward 19 at once and nozzle 21 carries out corresponding broadening, increases action.The increase spray house steward's 19 that control control system 18 also can be suitable in the continuous casting simultaneously water flowing, throughput guarantee that the spray ability of the spray width increase back unit are of nozzle 21 can not reduce.Thus, realize that the spray ability of nozzle 21 can real-time switching with strand 24 specifications realize online matching adjustment, guarantee that cooling capacity satisfies technological requirement.
In this up-slip process, the displacement transducer 22 at hydraulic cylinder 7 tops carries out displacement detecting to the piston of hydraulic cylinder 7 inside under certain frequency, guarantees that the lifting height of piston rod 23 reaches the command request of control control system 18 in the continuous casting.When the height of piston rod 23 reaches the command request of control control system 18 in the continuous casting, control control system 18 forms the closed loop self-locking by sensor 22 and oil supply system 17 in the continuous casting, the height of hydraulic cylinder 8 piston rods 23 is remained on this level, keep stable spray.
The utility model is by rational connecting rod climbing structure, the spray width that can realize nozzle is real-time, online adjustable the strand width, cut precision simultaneously at the good width of cloth of assurance, significantly reduced the complexity of spray pipe-line system, and can save the secondary cooling water amount to a certain extent.Use the utility model device can control the spray effect of two cold water spray systems flexibly, realize the reasonable spray process for cooling of casting billet surface, can significantly reduce strand because the product defects that does not match and cause of two cold technologies.
Claims (8)
1. the auxiliary cooling of the secondary of a slab hot rolling continuous casting machine fan-shaped segment sprays frame with activity, comprise: nozzle, the intermediate arm that is used for support nozzle and oblique arm and be connected the hydraulic cylinder of nozzle, it is characterized in that, nozzle (21) is provided with three the tunnel, one tunnel nozzle support is on intermediate arm (1), two road nozzles are supported in respectively on two oblique arms (6) that are slidingly connected with intermediate arm (1) in addition, described spray frame also comprises: be arranged at the first straight-arm slide block (2-1) on the above-mentioned intermediate arm (1) respectively and be arranged at angled-lift splits (3) on the oblique arm (6), described slide block can slide along wall, control control system (18) in oil supply system (17) that is connected with hydraulic cylinder (7) and the continuous casting respectively, be sheathed on the oblique arm (6), be positioned at the spring (4) of slide block (3) top, be sheathed on the intermediate arm (1), lay respectively at the spring (1-1 of the first straight-arm slide block (2-1) top and below, 1-2), with the pressure head (13) that the piston rod (23) of hydraulic cylinder (7) bottom is connected, the sensor (22) that is connected with the hydraulic cylinder signal.
2. the auxiliary cooling of the secondary of slab hot rolling continuous casting machine fan-shaped segment as claimed in claim 1 is characterized in that with movable spray frame in described spray equipment, angled-lift splits (3) carries out hinged the connection with the first straight-arm slide block (2-1) by two connecting rods (8).
3. the auxiliary cooling of the secondary of slab hot rolling continuous casting machine fan-shaped segment as claimed in claim 1 is characterized in that with movable spray frame in described spray equipment, the piston rod (23) of hydraulic cylinder (7) bottom is rigidly connected with pressure head (13).
4. the auxiliary cooling of the secondary of slab hot rolling continuous casting machine fan-shaped segment as claimed in claim 1 is characterized in that with movable spray frame, in described spray equipment, hydraulic cylinder brace table (11) and ribs (12) thereof is set.
5. the auxiliary cooling of the secondary of slab hot rolling continuous casting machine fan-shaped segment as claimed in claim 1 sprays frame with activity, it is characterized in that, in described spray equipment, except that spray house steward (19) and nozzle (21), remaining part comprises that spring, slide block, arm all impose to add water vapor seal.
6. the auxiliary cooling of the secondary of slab hot rolling continuous casting machine fan-shaped segment as claimed in claim 1 is characterized in that the rising slippage L1 of the first straight-arm slide block (2-1) with movable spray frame〉the rising slippage L2 of the second straight-arm slide block (2-2).
7. the auxiliary cooling of the secondary of slab hot rolling continuous casting machine fan-shaped segment as claimed in claim 1 sprays frame with activity, it is characterized in that, the angle between described both sides oblique arms (6) and the intermediate arm (1) and the spray angle commensurate in scope of nozzle (21) are arranged on 45～60 degree scopes.
8. the auxiliary cooling of the secondary of slab hot rolling continuous casting machine fan-shaped segment as claimed in claim 1 is characterized in that with movable spray frame in described spray equipment, three road nozzles are supported on intermediate arm (1) and two oblique arms (6) by the shower water arm respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201532373U CN201283419Y (en) | 2008-09-19 | 2008-09-19 | Movable spraying rack for secondary auxiliary cooling of slab casting machine sector segment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201532373U CN201283419Y (en) | 2008-09-19 | 2008-09-19 | Movable spraying rack for secondary auxiliary cooling of slab casting machine sector segment |
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| CN201283419Y true CN201283419Y (en) | 2009-08-05 |
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| CNU2008201532373U Expired - Fee Related CN201283419Y (en) | 2008-09-19 | 2008-09-19 | Movable spraying rack for secondary auxiliary cooling of slab casting machine sector segment |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101642804B (en) * | 2009-09-09 | 2011-01-19 | 北京科技大学 | A Method for Realizing Uniform Secondary Cooling of Continuous Casting Slab |
| CN102303107A (en) * | 2011-09-22 | 2012-01-04 | 首钢总公司 | Secondary cooling nozzle arrangement method for straight arc plate blank continuous casting machine |
| CN102430733A (en) * | 2011-12-21 | 2012-05-02 | 天津钢铁集团有限公司 | Secondary cooling water amplitude-cutting control method of slab continuous casting machine |
| CN102717046A (en) * | 2012-06-29 | 2012-10-10 | 秦皇岛首秦金属材料有限公司 | Calculating method for second cooling water automatic width adjustment of thick-slab continuous casting machine |
| CN102744382A (en) * | 2011-12-28 | 2012-10-24 | 中国重型机械研究院有限公司 | Electrodeless widthwise cutting device and method for adjusting secondary cooling water |
| CN105478704A (en) * | 2016-01-04 | 2016-04-13 | 河北钢铁股份有限公司邯郸分公司 | System for preventing continuous casting corner crack defect of micro-alloy steel casting blank and application method thereof |
| CN111944982A (en) * | 2020-09-15 | 2020-11-17 | 大连万通能源装备有限公司 | Novel energy-saving consumption-reducing continuous type cast tube annealing furnace system |
-
2008
- 2008-09-19 CN CNU2008201532373U patent/CN201283419Y/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101642804B (en) * | 2009-09-09 | 2011-01-19 | 北京科技大学 | A Method for Realizing Uniform Secondary Cooling of Continuous Casting Slab |
| CN102303107A (en) * | 2011-09-22 | 2012-01-04 | 首钢总公司 | Secondary cooling nozzle arrangement method for straight arc plate blank continuous casting machine |
| CN102430733A (en) * | 2011-12-21 | 2012-05-02 | 天津钢铁集团有限公司 | Secondary cooling water amplitude-cutting control method of slab continuous casting machine |
| CN102430733B (en) * | 2011-12-21 | 2013-07-03 | 天津钢铁集团有限公司 | Secondary cooling water amplitude-cutting control method of slab continuous casting machine |
| CN102744382A (en) * | 2011-12-28 | 2012-10-24 | 中国重型机械研究院有限公司 | Electrodeless widthwise cutting device and method for adjusting secondary cooling water |
| CN102717046A (en) * | 2012-06-29 | 2012-10-10 | 秦皇岛首秦金属材料有限公司 | Calculating method for second cooling water automatic width adjustment of thick-slab continuous casting machine |
| CN105478704A (en) * | 2016-01-04 | 2016-04-13 | 河北钢铁股份有限公司邯郸分公司 | System for preventing continuous casting corner crack defect of micro-alloy steel casting blank and application method thereof |
| CN105478704B (en) * | 2016-01-04 | 2018-03-23 | 河北钢铁股份有限公司邯郸分公司 | Prevent the system and its application method of micro alloyed steel strand continuous casting chink defect |
| CN111944982A (en) * | 2020-09-15 | 2020-11-17 | 大连万通能源装备有限公司 | Novel energy-saving consumption-reducing continuous type cast tube annealing furnace system |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090805 Termination date: 20160919 |