CN108406234A - The production method of steel roll package corner protector - Google Patents
The production method of steel roll package corner protector Download PDFInfo
- Publication number
- CN108406234A CN108406234A CN201810184824.7A CN201810184824A CN108406234A CN 108406234 A CN108406234 A CN 108406234A CN 201810184824 A CN201810184824 A CN 201810184824A CN 108406234 A CN108406234 A CN 108406234A
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- Prior art keywords
- steel
- corner protector
- roll
- corner
- blank
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
- B21D5/14—Bending sheet metal along straight lines, e.g. to form simple curves by passing between rollers
Abstract
The invention discloses a kind of production methods of steel roll package corner protector, including step：S1, standby sample：Coiled material is subjected to bundling, forms narrow steel strip volume；S2, uncoiling：Narrow steel strip volume after bundling is placed on uncoiler and carries out uncoiling, forms steel band item；S3, shearing：Steel band item is sheared, forms blank, blank is precoated steel plate；S4, bending：Bending is carried out to blank；S5, rolling formation：Rolling formation is carried out to the blank after bending, forms corner protector.The production method of steel roll package corner protector of the present invention; corner protector is made using precoated steel plate; the spraying process using the cold-reduced sheet production process later stage is avoided, the processing of steel roll package corner protector is facilitated, reduces pollution; it is cost-effective; the physical and mental health for protecting worker, the disadvantage for avoiding the insufficient strength and toughness that prepare steel roll package corner protection band using plastics bad, manufactured steel roll package corner protector have high intensity; antirust ability is strong, and aesthetics is good.
Description
Technical field
The invention belongs to steel roll package technical fields, specifically, the present invention relates to a kind of making of steel roll package corner protector
Method.
Background technology
Steel roll package corner protector is a kind of auxiliary during packaging, transport, handling, use for the coil of strip in metallurgy industry
Articles for use are helped, the edge damage of coil of strip or the volume that collapses can be effectively protected.
Steel roll package corner protector plays important guarantor to the especially high-grade steel appliance plate of coil of strip, car panel in transportational process
Shield acts on.Steel roll package corner protector not only will have certain intensity to protect steel roll rim not cause to destroy due to transport, also
Have corrosion resistance, be not easy to get rusty, while to have aesthetics.
The material for being used to prepare steel roll package corner protector is mainly divided into two classes, the first is to be mainly made of metal materials to prepare steel
Corner protector is rolled up, second is to prepare steel roll package corner protector using high strength plastics.
When preparing steel roll package corner protector using metal material, corner protector inside and outside coil of strip is directly prepared by cold-reduced sheet, due to cold rolling
Substrate color gray, color is more ugly, and its surface does not have antirust function, and coil of strip is in the process transported and stored
In, the corner protector of edge can corrode, it could even be possible to the coil of strip of pollution package interior, and inside and outside corner protector is disposable, is made
It is scrapped substantially after being finished.
Some Domestic producer is to prepare corner protection structure inside and outside steel roll package with cold-rolled substrate, then carry out rust prevention by applying liquid material paint at present
Prepared by mode, increase the anti-corrosive properties of inside and outside corner protector by rust prevention by applying liquid material technique, while increasing aesthetics by changing color of paint,
But cost of labor can be increased by the technique, working efficiency can also reduce, not environmentally, to the environmental pollution around factory compared with
Greatly, paint-like flavour also also has significant effect the physical and mental health of millworker.
The patent document of Publication No. CN203473514U discloses a kind of steel roll package corner protector being prepared by galvanized sheet,
It includes top and the bottom, and cylinder top is that monolayer material is constituted, and cylinder lower part and annulus are that bi-material layers are constituted, complex-shaped, also
It needs to increase by two parallel discontinuous reinforcing ribs on annulus to increase intensity.The production technology of this steel roll package corner protector is multiple
Miscellaneous, processing is more difficult, and the steel roll package corner protector color that galvanized sheet is constituted is single, and aesthetics is poor.
Invention content
The present invention is directed at least solve one of the technical problems existing in the prior art.For this purpose, the present invention provides a kind of steel
The production method of coil packing corner protector, it is therefore an objective to facilitate the processing of steel roll package corner protector.
To achieve the goals above, the technical solution that the present invention takes is：The production method of steel roll package corner protector, including step
Suddenly：
S1, standby sample：Coiled material is subjected to bundling, forms narrow steel strip volume；
S2, uncoiling：Narrow steel strip volume after bundling is placed on uncoiler and carries out uncoiling, forms steel band item；
S3, shearing：Steel band item is sheared, forms blank, blank is precoated steel plate；
S4, bending：Bending is carried out to blank；
S5, rolling formation：Rolling formation is carried out to the blank after bending, forms corner protector.
The tensile strength of the precoated steel plate is 320~450MPa, elongation percentage >=33%.
The thickness of the precoated steel plate is 1.0~2.0mm.
The width of the narrow steel strip volume is 80~160mm.
In the step S4, by right-angle folding bender by 90 degree of blank bending.
In the step S5, rolling formation is carried out to the blank after bending by rolling formation machine, the corner protector of formation includes
First Corner protecting board and the second Corner protecting board, the first Corner protecting board and the second Corner protecting board are vertical connection.
The width of second Corner protecting board is less than the width of first Corner protecting board.
Second Corner protecting board has trapezoidal groove, trapezoidal groove circumferentially arranged multiple on the second Corner protecting board.
In the step S5, rolling formation machine includes matched topping roll and bottom roll, and bottom roll is located at topping roll
Lower section, bottom roll include lower roll body and are set on lower roll body and the molding double wedge for making to mold trapezoidal groove on corner protector,
It is to be uniformly distributed circumferentially on lower roll body that multiple and all molding double wedges, which are arranged, in molding double wedge.
The width of the molding double wedge is gradually to increase to the other end since one end on length direction, is molded double wedge
Length direction is parallel with the axial direction of lower roll body.
The production method of steel roll package corner protector of the present invention makes corner protector using precoated steel plate, avoids using cold-reduced sheet
The spraying process in production process later stage facilitates the processing of steel roll package corner protector, reduces pollution, cost-effective, protects the body of worker
Heart health, the disadvantage for avoiding the insufficient strength and toughness that prepare steel roll package corner protection band using plastics bad, manufactured coil of strip
Packaging angle bead has high intensity, and antirust ability is strong, and aesthetics is good, fully meets various requirement of the coil of strip in transportational process,
Colorful aesthetics is more suitable for the favor of downstream client.
Description of the drawings
This specification includes the following drawings, and shown content is respectively：
Fig. 1 is the technical process schematic diagram of the production method of steel roll package corner protector of the present invention；
Fig. 2 is the structural schematic diagram of trapezoidal roller；
Fig. 3 is the schematic cross-section of the blank after bending；
Fig. 4 is the structural schematic diagram of topping roll；
Fig. 5 is the structural schematic diagram of bottom roll；
Fig. 6 is the structural schematic diagram of inner protective corner；
Fig. 7 is the structural schematic diagram of outer corner protector；
In figure label for：
1, uncoiler；2, cutter；3, right-angle folding bender；4, rolling formation machine；5, workbench；6, help roll；7, leading
To roller；8, bottom roll；801, lower roll body；802, it is molded double wedge；9, the second Corner protecting board；10, the first Corner protecting board；11, topping roll；
12, trapezoidal groove.
Specific implementation mode
Below against attached drawing, by the description of the embodiment, making to the specific implementation mode of the present invention further details of
Explanation, it is therefore an objective to those skilled in the art be helped to have more complete, accurate to the inventive concept of the present invention, technical solution and go deep into
Understanding, and contribute to its implementation.
The present invention provides a kind of production methods of steel roll package corner protector, including following step：
S1, standby sample：Coiled material is subjected to bundling, forms narrow steel strip volume；
S2, uncoiling：Narrow steel strip volume after bundling is placed on uncoiler 1 and carries out uncoiling, forms steel band item；
S3, shearing：Steel band item is sheared, forms blank, blank is precoated steel plate；
S4, bending：Bending is carried out to blank；
S5, rolling formation：Rolling formation is carried out to the blank after bending, forms corner protector.
Specifically, the production method of steel roll package corner protector of the present invention is to make steel roll package shield using precoated steel plate
Angle, precoated steel plate are, by surface preparation, to use roller using cold-strip steel or galvanized steel as substrate on continuous unit
Mode of painting or other means coats one or more layers organic coating in surface of steel plate, by baking hardening and cooling one obtained
Kind characteristic plank.Precoated steel plate surface is not only by force and hard with steel plate high intensity, height with beautiful in colour, corrosion resistance
Degree, the features such as plasticity is good, and part precoated shet is nontoxic, is a kind of preferable environment-friendly products, steel roll package is prepared with it
Corner protector not only enables steel roll package corner protector with the same intensity of cold-reduced sheet, it may have the corrosion resistance as plastics,
Also there is various color, product packaging aesthetics can be promoted.
Steel roll package corner protector is made using precoated steel plate, the mechanical property of precoated steel plate is used for ensureing to prepare coil of strip packet
There is certain intensity and toughness after filling corner protector, it is ensured that product quality so that steel roll package corner protector during use can
Supporting steel coils internal diameter is unlikely to the volume that collapses, and can also prevent from protecting the shock suffered by steel roll rim in transportational process, while to have one
Fixed plasticity facilitates its machine-shaping.In view of the intensity and processability of steel roll package corner protector, the mechanical property of precoated steel plate
Can require be：Yield strength is 230~300MPa, and tensile strength is 320~450MPa, elongation percentage >=33%.Precoated steel plate
Thickness be 1.0~2.0mm.
The coating performance of precoated steel plate：By carrying out adhering coating to substrate surface, the antirust energy of substrate can be increased
Power, the color of coating can increase the aesthetics of corner protector.The present invention claims precoated steel plates after 90 degree of dog-ears, and coating is lossless
Wound, the curved performance requirements of T, which meet, is less than or equal to 3T, coating impact property requirement >=9J；The finishing coat thickness of precoated steel plate is 8~15
μm, the back of the body paint thickness of precoated steel plate is 5 ± 2 μm, it is ensured that product quality so that the antirust ability of steel roll package corner protector is strong.
In above-mentioned steps S1, precoated steel plate is subjected to bundling, the thickness of used precoated steel plate：1.0~
2.0mm, longitudinal sectional is scale width：80~160mm.Coiled material be color coating coil of strip, bundling formed narrow steel strip volume width be 80~
160mm。
In above-mentioned steps S2, as shown in Figure 1, being formed by uncoiler 1 to the narrow steel strip volume after bundling is carried out uncoiling
Steel band item.
In above-mentioned steps S3, as shown in Figure 1, under transport roller effect, steel band item is sheared by cutter 2,
Steel band item is cut, forms the blank with certain length, blank is one piece of block precoated steel plate, and the length of blank is by corner protector
Interior diameter determine.
In above-mentioned steps S4, as shown in Figure 1, by right-angle folding bender 3 by 90 degree of blank bending, right-angle folding bender 3 is right
Blank carries out longitudinal bending, is acted at trapezoidal roller base angle, along 90 degree of longitudinal roll-in bending, the structure of trapezoidal roller as shown in Fig. 2,
The section of blank after bending is L-shaped, as shown in figure 3, the wherein size of short side is L2, the size of long side is L1, and short side
Size L2 can be regulated and controled according to card slot and trapezoidal roller, for ensure realize the present invention prepare steel roll package with precoated steel plate
Corner protector, after bending, bending place coating is not fallen off precoated steel plate, and there is no other defects such as scuffing for coating surface.
In above-mentioned steps S5, as shown in Figure 1, carrying out rolling formation, roller to the blank after bending by rolling formation machine 4
Pressing formation machine 4 includes matched topping roll 11 and bottom roll 8, and bottom roll 8 is located at the lower section of topping roll 11, and topping roll 11 is under
Roll 8 is rotatable setting, topping roll 11 is parallel with the axis of bottom roll 8 and topping roll 11 be located at bottom roll 8 just on
The axis of side, topping roll 11 and bottom roll 8 is located in horizontal plane, and the blank after bending leads between topping roll 11 and bottom roll 8
It crosses, topping roll 11 and bottom roll 8 match and carry out rolling formation to the blank after bending, and blank bends to circular ring shape, most end form
At satisfactory corner protector.
As shown in Figure 6 and Figure 7, corner protector is cirque structure, and corner protector includes the first Corner protecting board and the second Corner protecting board, the first shield
Gusset and the second Corner protecting board are vertical connection, and the first Corner protecting board and the second Corner protecting board are cirque structure, the first Corner protecting board
One side edge is connect with the one side edge of the second Corner protecting board and the first Corner protecting board and the second Corner protecting board are coaxial arrangement, the second corner protector
Plate extends towards the inner or outer side of the first Corner protecting board.The thickness size of first Corner protecting board and the second Corner protecting board is identical, the second shield
The width of gusset is less than the width of the first Corner protecting board, and the width direction of the first Corner protecting board is mutually hung down with the width direction of the second Corner protecting board
Directly, the width direction of the first Corner protecting board is axial parallel with it, and the width direction of the second Corner protecting board is axially perpendicular with it (to be
The radial direction of second Corner protecting board).In rolling formation, the second Corner protecting board is clipped between topping roll 11 and bottom roll 8, the second Corner protecting board
With trapezoidal groove 12, trapezoidal groove 12 is circumferentially arranged multiple on the second Corner protecting board and all trapezoidal grooves 12 are second
It is uniformly distributed circumferentially on Corner protecting board, there is trapezoidal groove 12 certain length, trapezoidal groove 12 to be set to the second Corner protecting board
On end face, trapezoidal groove 12 is the length direction extension along the second Corner protecting board and trapezoidal groove 12 is from one end of the second Corner protecting board
Extend to the other end, the width of trapezoidal groove 12 and gradually to be increased or reduced to the other end since one end on length direction
, to as trapezoidal.
Steel roll package corner protector is divided into inner protective corner and outer corner protector, and the structure of inner protective corner is as shown in fig. 6, inner protective corner is circular ring shape knot
Structure, inner protective corner include the first Corner protecting board and the second Corner protecting board, and the first Corner protecting board and the second Corner protecting board are vertical connection, the first corner protector
Plate and the second Corner protecting board are cirque structure, the one side edge of the first Corner protecting board connect with the one side edge of the second Corner protecting board and
First Corner protecting board and the second Corner protecting board are coaxial arrangement, and the second Corner protecting board extends towards the outside of the first Corner protecting board, i.e., the second shield
The direction that gusset is directed away from the center of the first Corner protecting board extends.The structure of outer corner protector is as shown in fig. 7, outer corner protector is circular ring shape knot
Structure, outer corner protector include the first Corner protecting board and the second Corner protecting board, and the first Corner protecting board and the second Corner protecting board are vertical connection, the first corner protector
Plate and the second Corner protecting board are cirque structure, the one side edge of the first Corner protecting board connect with the one side edge of the second Corner protecting board and
First Corner protecting board and the second Corner protecting board are coaxial arrangement, and the second Corner protecting board extends towards the inside of the first Corner protecting board, i.e., the second shield
Gusset extends towards the direction close to the center of the first Corner protecting board.
As shown in figure 4, topping roll 11 is cylinder, topping roll 11 has the periphery contacted for the surface with blank,
The periphery is cylindrical surface, and topping roll 11 is the smooth anodontia roller in surface.
As shown in figure 5, bottom roll 8 is nonstandard gear part, bottom roll 8 includes lower roll body 801 and is set to lower roll body 801
Molding double wedge 802 upper and for making to mold trapezoidal groove 12 on corner protector, it is convex that multiple and all moldings are arranged in molding double wedge 802
Tooth 802 is uniformly distributed circumferentially on lower roll body 801.Lower roll body 801 is cylinder, axis and the topping roll 11 of bottom roll 8
Axis it is parallel, molding double wedge 802 is fixedly connected with lower roll body 801, and adjacent two are molded between double wedges 802 and have in circumferential direction
There is tooth socket.Preferably, the width of molding double wedge 802 is gradually to increase to the other end since one end on length direction,
The length direction for being molded double wedge 802 is parallel with the axial direction of lower roll body 801, and the one end being molded on the length direction of double wedge 802 is wide
Degree is maximum, and the width for being molded the other end on the length direction of double wedge 802 is minimum, and the width direction of molding double wedge 802 is grown with it
It is perpendicular to spend direction.When carrying out rolling formation to blank, the molding double wedge 802 on bottom roll 8 is embedded in blank, and blank is made to produce
Change shape, and to mold trapezoidal groove 12, at the same time, non-wide molding double wedge 802 can make blank be bent, and make
It obtains precoated steel plate and generates plastic deformation.
For blank after roll-in, the short side surface of blank forms trapezoidal groove 12, the sunk portion on blank by roll-in
Parting category extends to length direction, and one end width of the molding double wedge 802 of bottom roll 8 is smaller so that one end of the short side of blank
Concave metal is less, and the other end width of the molding double wedge 802 of bottom roll 8 is larger so that the other end of the short side of blank is concave
Metal is more, extend it is larger, blank by 8 roll-in of upper and lower roll deformation, then by front guide roller 7 and help roll 6 under the action of
Bending cyclization, forms corner protector.Corner protector after forming is placed in work stage, it can be with continuous production.
The present invention steel roll package corner protector production method by using special construction bottom roll 8, it is ensured that precoated shet steel
Plate is bent into shape, and precoated steel plate is enable to generate plastic deformation, and paint, precoating can be fallen to avoid precoated steel plate
Coating at the trapezoidal groove 12 of layer steel plate will not fall off, and coating does not scratch, and corner protector circularity is preferable, can be automatic cyclic, nothing
Bridging arrangement or device need to separately be set, it is ensured that product quality.
Corner protector section is right angle inside and outside the steel roll package that the present invention is prepared using precoated steel plate, and annularly, both ends are not necessarily to
It is fixedly connected, there is some strength, steel plate edge can be effectively protected, precoated steel plate is recessed after mold rolling formation
Coating is not ploughed broken at trace, is had stronger corrosion-resisting function, can be recycled for multiple times.
The production method of the steel roll package corner protector of the present invention has following innovative point compared with prior art：
(1) with using cold-reduced sheet prepare after through corner protector inside and outside spraying compared with, inside and outside corner protector prepared by the present invention does not have cold rolling
Spraying process after plate forming saves hall space, and continuous production simplifies technique, reduces cost, improves operation link, full
Sufficient plant area and surrounding environmental requirement.
(2) compared with corner protector prepared by cold-reduced sheet, its surface of precoated steel plate internal-external angle-protecting prepared by the present invention have compared with
Good Corrosion Protection is suitble to the prolonged transport of coil of strip, corner protector not to corrode, while corner protector prepared by precoated steel plate is not
Corrosion, which occurs, to recycle, and be recycled for multiple times.
(3) compared with Plastic protective corner, the present invention has higher intensity and toughness toughness, not when coil of strip is by slight impact
It can crack, there is certain toughness, be also convenient for processing and prepare, will not be poor as Plastic protective corner plasticity, it will be led by slight impact
Corner protector fragmentation is caused, steel roll rim, therefore the method provided by this patent using precoated steel plate cannot be provided again
The corner protector prepared with thinking can preferably protect the edge of coil of strip.
The present invention is exemplarily described above in association with attached drawing.Obviously, present invention specific implementation is not by above-mentioned side
The limitation of formula.As long as using the improvement of the various unsubstantialities of inventive concept and technical scheme of the present invention progress；Or not
It is improved, the above-mentioned design of the present invention and technical solution are directly applied into other occasions, in protection scope of the present invention
Within.
Claims (10)
1. the production method of steel roll package corner protector, which is characterized in that including step：
S1, standby sample：Coiled material is subjected to bundling, forms narrow steel strip volume；
S2, uncoiling：Narrow steel strip volume after bundling is placed on uncoiler and carries out uncoiling, forms steel band item；
S3, shearing：Steel band item is sheared, forms blank, blank is precoated steel plate；
S4, bending：Bending is carried out to blank；
S5, rolling formation：Rolling formation is carried out to the blank after bending, forms corner protector.
2. the production method of steel roll package corner protector according to claim 1, which is characterized in that the precoated steel plate resists
Tensile strength is 320~450MPa, elongation percentage >=33%.
3. the production method of steel roll package corner protector according to claim 1 or 2, which is characterized in that the precoated steel plate
Thickness be 1.0~2.0mm.
4. the production method of steel roll package corner protector according to claim 1, which is characterized in that the width of the narrow steel strip volume
For 80~160mm.
5. the production method of steel roll package corner protector according to claim 1, which is characterized in that in the step S4, pass through
Right-angle folding bender is by 90 degree of blank bending.
6. the production method of steel roll package corner protector according to claim 5, which is characterized in that in the step S5, pass through
Rolling formation machine carries out rolling formation to the blank after bending, and the corner protector of formation includes the first Corner protecting board and the second Corner protecting board, the
One Corner protecting board and the second Corner protecting board are vertical connection.
7. the production method of steel roll package corner protector according to claim 6, which is characterized in that the width of second Corner protecting board
Width of the degree less than first Corner protecting board.
8. the production method of the steel roll package corner protector described according to claim 6 or 7, which is characterized in that second Corner protecting board
With trapezoidal groove, trapezoidal groove is circumferentially arranged multiple on the second Corner protecting board.
9. the production method of steel roll package corner protector according to claim 8, which is characterized in that in the step S5, roll-in
Forming machine includes matched topping roll and bottom roll, and bottom roll is located at the lower section of topping roll, and bottom roll includes lower roll body and sets
It is placed in the molding double wedge on lower roll body and for making to mold trapezoidal groove on corner protector, multiple and all moldings are arranged in molding double wedge
Double wedge is uniformly distributed circumferentially on lower roll body.
10. the production method of steel roll package corner protector according to claim 9, which is characterized in that the width of the molding double wedge
Degree is molded the axis of the length direction and the lower roll body of double wedge gradually to increase to the other end since one end on length direction
To parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810184824.7A CN108406234A (en) | 2018-03-07 | 2018-03-07 | The production method of steel roll package corner protector |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810184824.7A CN108406234A (en) | 2018-03-07 | 2018-03-07 | The production method of steel roll package corner protector |
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| CN108406234A true CN108406234A (en) | 2018-08-17 |
Family
ID=63130080
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| CN201810184824.7A Pending CN108406234A (en) | 2018-03-07 | 2018-03-07 | The production method of steel roll package corner protector |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111791020A (en) * | 2019-04-09 | 2020-10-20 | 济南莱特不锈钢制管有限公司 | Production method of double-sided color-coated high-quality cold-bending steel |
| CN113500121A (en) * | 2021-06-28 | 2021-10-15 | 肇庆宏旺金属实业有限公司 | Device for manufacturing steel coil corner wrapping belt |
| CN113523715A (en) * | 2021-06-17 | 2021-10-22 | 山东宏旺实业有限公司 | Production equipment and production method of steel coil corner protecting belt |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111791020A (en) * | 2019-04-09 | 2020-10-20 | 济南莱特不锈钢制管有限公司 | Production method of double-sided color-coated high-quality cold-bending steel |
| CN113523715A (en) * | 2021-06-17 | 2021-10-22 | 山东宏旺实业有限公司 | Production equipment and production method of steel coil corner protecting belt |
| CN113500121A (en) * | 2021-06-28 | 2021-10-15 | 肇庆宏旺金属实业有限公司 | Device for manufacturing steel coil corner wrapping belt |
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Address after: 243003 8 Jiuhua Road, Yushan, Ma'anshan, Anhui Applicant after: Ma'anshan Iron and Steel Co., Ltd. Address before: 243003 Intellectual Property Department, Technical Center No. 8, Hunan West Road, Yushan District, Ma'anshan City, Anhui Province Applicant before: Ma'anshan Iron and Steel Co., Ltd. |
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Application publication date: 20180817 |