CN102009065A - Method and device for rolling metal section with asymmetric cross section - Google Patents
Method and device for rolling metal section with asymmetric cross section Download PDFInfo
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- CN102009065A CN102009065A CN 201010589100 CN201010589100A CN102009065A CN 102009065 A CN102009065 A CN 102009065A CN 201010589100 CN201010589100 CN 201010589100 CN 201010589100 A CN201010589100 A CN 201010589100A CN 102009065 A CN102009065 A CN 102009065A
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- 238000005096 rolling process Methods 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title claims abstract description 37
- 239000002184 metal Substances 0.000 title abstract description 7
- 229910052751 metal Inorganic materials 0.000 title abstract description 7
- 239000007769 metal material Substances 0.000 claims abstract description 12
- 229910000831 Steel Inorganic materials 0.000 claims description 26
- 239000010959 steel Substances 0.000 claims description 26
- 238000006073 displacement reaction Methods 0.000 claims description 8
- 239000010687 lubricating oil Substances 0.000 claims description 6
- 238000000465 moulding Methods 0.000 claims description 5
- 239000000725 suspension Substances 0.000 description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
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Abstract
The invention provides a method and a device for rolling a metal section with an asymmetric cross section. The method for rolling the metal section with the asymmetric cross section comprises the following steps that: in the rolling process, an upper horizontal roller and a lower horizontal roller rotate along an opposite direction so as to grip a metal material for forming; simultaneously, a left vertical roller and a right vertical roller which are positioned in the same vertical plane as that of the upper horizontal roller and the lower horizontal roller and can rotate along a vertical direction are pressed against the left surface and the right surface of the upper horizontal roller and the lower horizontal roller respectively so as to prevent the upper horizontal roller and/or the lower horizontal roller from moving along an axial direction. By the method and the device for rolling the metal section with the asymmetric cross section, the size and accuracy of a metal section product can be precisely and steadily controlled, so that the product quality is improved.
Description
Statement: patent application of the present invention is in having submitted same utility application to State Intellectual Property Office on the same day.
Technical field
The present invention relates to metal rolled technical field, more particularly, relate to a kind of method and rolling device of rolling asymmetric cross section shape.
Background technology
Usually, compare with weldment or cast member, because the asymmetric shape of cross section adopts rolling mill practice directly one-body molded, so it has good intensity and toughness, and long service life and can realize that automation produces in enormous quantities.Therefore, the asymmetric shape of the cross section field that is widely used.Yet; prior art is rolling when having the shape of asymmetric cross section; the phenomenon that can have horizontal roll generation play usually, this can cause the size of the shape product with asymmetric cross section of roll forming deviation to occur, has reduced the size and the precision of product.
For example, will be example explanation the deficiencies in the prior art with rolling shaped steel below with asymmetric cross section.When adopting the rolling shaped steel with asymmetric cross section of prior art, the method that generally adopts is at present: after processing hole slot on two horizontal rolls, rolled piece nipped and the method for moulding thereby two horizontal rolls are rotated in opposite direction.Yet, because this shaped steel has asymmetric cross section, so in the process that it is rolled, the distortion meeting of rolled piece produces along its axial thrust two horizontal rolls, and this thrust is greater than the reaction force of thrust bearing to this horizontal roll usually, thereby play can take place in two horizontal rolls, and then causes the shape and size of the pass of rolled piece to change, and has influenced the size and the precision of product.For example, at the rolling magnetic suspension train section of track during with F shaped steel, will play 2～3mm between two horizontal rolls, thus cause the thick size of leg of F shaped steel can not obtain stable control, influenced product quality.
Summary of the invention
The problems referred to above at the prior art existence, the invention provides a kind of method and rolling device of rolling asymmetric cross section shape, the horizontal roll play phenomenon that method and apparatus of the present invention takes place in the time of can preventing or be reduced in effectively rolling shape with asymmetric cross section, thereby the size and the precision of the shape product with asymmetric cross section are stably controlled, improved the quality of product.
An aspect of of the present present invention provides a kind of method of shape of rolling asymmetric cross section, described method is included in the operation of rolling, last horizontal roll and following horizontal roll rotate in opposite direction with moulding that metal material is nipped, be positioned at same vertical plane and the left edger roll that can vertically rotate and right edger roll with last horizontal roll and following horizontal roll simultaneously and be pressed against respectively on the left-hand face and right lateral surface of horizontal roll and following horizontal roll, to prevent horizontal roll and/or following horizontal roll play vertically.
The method of described according to an aspect of the present invention rolling asymmetric cross section shape, described asymmetric cross section shape can be the asymmetrical type steel.
The method of described according to an aspect of the present invention rolling asymmetric cross section shape, described asymmetric shaped steel can be F shaped steel.
The method of described according to an aspect of the present invention rolling asymmetric cross section shape, the described roller of going up horizontal roll and following horizontal roll directly can be identical and in the scope of 690～1400mm.The roller of described left edger roll and right edger roll footpath can be identical and in the scope of 510～980mm.
The method of described according to an aspect of the present invention rolling asymmetric cross section shape, described left edger roll and right edger roll can apply the pre-throw-on pressure of horizontal direction to last horizontal roll and following horizontal roll, and described pre-throw-on pressure can guarantee that the play displacement of going up horizontal roll and/or following horizontal roll is not more than 0.3mm.
The method of described according to an aspect of the present invention rolling asymmetric cross section shape, described method also can be included in the operation of rolling, provides the step of rolled lubricating oil and the step that rolled lubricating oil is provided to the surface that the right lateral surface with last horizontal roll and following horizontal roll of described right edger roll contacts to the surface that the left-hand face with last horizontal roll and following horizontal roll of described left edger roll contacts.
Another aspect of the present invention provides a kind of rolling device.Described rolling device comprises horizontal roll and following horizontal roll, described rolling device also comprises on the left-hand face that is pressed against horizontal roll and following horizontal roll and the left edger roll that can vertically rotate is gone up the right edger roll that also can vertically rotate with the surface, the right side that is pressed against horizontal roll and following horizontal roll, and upward the center line of horizontal roll, following horizontal roll, left edger roll and right edger roll all is positioned at same vertical plane.
Described according to a further aspect in the invention rolling device, wherein, described left edger roll can be installed in left edger roll case or the left shaft holder with on the left-hand face that is pressed against horizontal roll and following horizontal roll, and right edger roll can be installed in right edger roll case or the right bearing seat with on the right lateral surface that is pressed against horizontal roll and following horizontal roll.
Described according to a further aspect in the invention rolling device wherein, can be formed with the hole slot that is used for metal material is rolled into asymmetric section bar on the circumferential surface of described upward horizontal roll and following horizontal roll.
Described according to a further aspect in the invention rolling device, wherein, described asymmetric section bar can be F shaped steel.
Described according to a further aspect in the invention rolling device, wherein, the described roller of going up horizontal roll and following horizontal roll directly can be identical and in the scope of 690～1400mm.The roller of described left edger roll and right edger roll footpath can be identical and in the scope of 510～980mm.
Compared with prior art, method and apparatus of the present invention adopts two edger rolls that are positioned at the side horizontal roll to be applied the method for axially pre-throw-on pressure, solve the problem of the bigger than normal and roll axial float of axial rolling force that the shape of asymmetric cross section exists in the operation of rolling, thereby make the size and the precision of the shape product of asymmetric cross section obtain accurately and stably controlling, improved the quality of product.
Description of drawings
Fig. 1 shows the method for rolling according to an exemplary embodiment of the present invention asymmetric cross section shape and the schematic diagram of rolling device.
The specific embodiment
Describe exemplary embodiment of the present invention in detail below in conjunction with accompanying drawing.For clear, can enlarge the size of each parts in the accompanying drawing.
Fig. 1 shows the method for rolling according to an exemplary embodiment of the present invention asymmetric cross section shape and the schematic diagram of rolling device.
As shown in Figure 1, in exemplary embodiment of the present invention, rolling device comprises horizontal roll 1, following horizontal roll 2, left edger roll 3 and right edger roll 4.Axis direction is that the last horizontal roll 1 of horizontal direction and the circumferential surface of following horizontal roll 2 (for example are provided with the hole slot corresponding with the cross section of the shape product 5 with asymmetric cross section, F type shown in Fig. 1), and in the rolling mill practice process, under the drive of motor (not shown), last horizontal roll 1 and following horizontal roll 2 are in opposite direction (for example, direction shown in the arrow among Fig. 1) rotates, thereby with the metal material moulding of nipping, to form final shape product 5 with asymmetric cross section.Last horizontal roll 1 and following horizontal roll 2 can be fixed respectively, for example, can come the fixing respectively roll shaft 6 of horizontal roll 1 and the roll shaft 6 of following horizontal roll 2 gone up with the bearing block (not shown).Axis direction is the left side that the left edger roll 3 of vertical direction is arranged on horizontal roll 1 and following horizontal roll 2, and is compressed against on the left-hand face of horizontal roll 1 and following horizontal roll 2.Axis direction is the right side that the right edger roll 4 of vertical direction is arranged on horizontal roll 1 and following horizontal roll 2, and is compressed against on the right lateral surface of horizontal roll 1 and following horizontal roll 2.The center line (that is axis) of left side edger roll 3, right edger roll 4, last horizontal roll 1 and following horizontal roll 2 is positioned at same vertical plane.Left edger roll 3 is installed in the left edger roll case (not shown), is pressed against on the left-hand face of horizontal roll 1 and following horizontal roll 2 to guarantee left edger roll 3.Right edger roll 4 is installed in the right edger roll case (not shown), is pressed against on the right lateral surface of horizontal roll 1 and following horizontal roll 2 to guarantee right edger roll 4.When horizontal roll on the driven by motor 1 and following horizontal roll 2 when its horizontal axis rotates with the rolled metal material in the opposite direction, because between the left-hand face of the circumferential surface of left edger roll 3 and last horizontal roll 1 and following horizontal roll 2, can produce frictional force, so thereby 3 meetings of left edger roll be driven along its vertical axis direction rotation by frictional force; Simultaneously owing between the right lateral surface of the circumferential surface of right edger roll 4 and last horizontal roll 1 and following horizontal roll 2, also can produce frictional force, so thereby right edger roll 4 understand by frictional force and drive along its vertical axis direction rotation.When rotating, left edger roll 3 and right edger roll 4 can limit horizontal roll 1 and/or descend the play of horizontal roll 2 along the horizontal axis direction.Therefore, adopt the size and the precision of control shape product that can be accurately also stable according to rolling device rolled metal material of the present invention, thereby improved the quality of product.
In the present invention, the roller footpath of last horizontal roll 1 and following horizontal roll 2 can specifically be determined according to rolling mill practice, for example, at the rolling magnetic suspension train section of track during with F shaped steel, the roller of last horizontal roll 1 and following horizontal roll 2 is directly identical and can select in the scope of 690～1400mm.The roller footpath of a left side edger roll 3 and right edger roll 4 can be the last horizontal roll 1 or 0.36～1.42 times of roller footpath of horizontal roll 2 down, for example, at the rolling magnetic suspension train section of track during with F shaped steel, the roller footpath of left edger roll 3 and right edger roll 4 is identical and can select in the scope of 510～980mm.
As shown in Figure 1, in exemplary embodiment of the present invention, the method of rolling asymmetric cross section shape is: in the process of rolled metal material, driven by motor has the last horizontal roll 1 and the following horizontal roll 2 that are formed with the hole slot corresponding with the shape of asymmetric cross section shape product 5 and rotates in opposite direction with moulding that metal material is nipped, while is positioned at left edger roll 3 same vertical plane and that can vertically rotate with last horizontal roll 1 and following horizontal roll 2 and right edger roll 4 is pressed against respectively on the left-hand face and right lateral surface of horizontal roll 1 and following horizontal roll 2, to prevent horizontal roll 1 and/or following horizontal roll 2 play vertically.In Fig. 1, the shape of asymmetric cross section is asymmetric shaped steel, specifically, can be F shaped steel, but the invention is not restricted to this, and for example, apparatus and method of the present invention also can be used for producing Z-shape steel, F type or Z type alloy profile etc.
In addition, according to exemplary embodiment of the present invention, the method of rolling asymmetric cross section shape also can be included in the operation of rolling, left the surface that contacts of the left-hand face with last horizontal roll 1 and following horizontal roll 2 of edger roll 3 provide the step of rolled lubricating oil and to the right the surface that contacts of the right lateral surface with last horizontal roll 1 and following horizontal roll 2 of edger roll 4 step of rolled lubricating oil is provided.Thereby can improve the lubricating condition of left edger roll 3 and right edger roll 4, prolong upper and lower horizontal roll 1 and 2 and service life of left and right edger roll 3 and 4.
In addition, according to exemplary embodiment of the present invention, a left side edger roll 3 and right edger roll 4 can be not more than the pre-throw-on pressure of 0.3mm to the play displacement that can guarantee last horizontal roll 1 and/or following horizontal roll 2 that last horizontal roll 1 and following horizontal roll 2 apply horizontal direction (that is the horizontal axis direction of last horizontal roll 1 and following horizontal roll 2).Here, the size of pre-throw-on pressure is mainly determined according to the specification and the material of shape product.For example, at the rolling magnetic suspension train section of track during with F shaped steel, for will guarantee to go up horizontal roll 1 and/or down the play displacement of horizontal roll 2 be not more than 0.3mm, edger roll 3 and right edger roll 4 apply the pre-throw-on pressure that is not less than 1000KN to along continuous straight runs left respectively.
Present embodiment is substantially the same manner as Example 1.The difference of the two is the following aspects.
Present embodiment adopts conventional omnipotent four rolled steel machines to come rolling F shaped steel, and the roll shaft 6 of upper and lower horizontal roll 1 and 2 both sides is inserted in the bearing block (not shown) that bearing is housed, and left and right edger roll 3 and 4 is installed in respectively in the left and right edger roll case (not shown).Upper and lower horizontal roll 1 is identical with 2 roller footpath and be 770mm, and left and right edger roll 3 is directly identical with 4 roller footpath roller and be 540mm.The pre-throw-on pressure of left and right edger roll is 1100KN.The maximum play displacement of last horizontal roll 1 and/or following horizontal roll 2 is 0.2mm.The thick fluctuation range of leg of the F shaped steel product that makes in the present embodiment, is 0.5mm.
Present embodiment is substantially the same manner as Example 2.The difference of the two is the following aspects.
Upper and lower horizontal roll 1 is identical with 2 roller footpath and be 690mm, and left and right edger roll 3 is directly identical with 4 roller footpath roller and be 510mm.The pre-throw-on pressure of left and right edger roll is 1000KN.The maximum play displacement of last horizontal roll 1 and/or following horizontal roll 2 is 0.1mm.The thick fluctuation range of leg of the F shaped steel product that makes in the present embodiment, is 0.2mm.
Present embodiment is substantially the same manner as Example 2.The difference of the two is the following aspects.
Upper and lower horizontal roll 1 is identical with 2 roller footpath and be 1400mm, and left and right edger roll 3 is directly identical with 4 roller footpath roller and be 980mm.The pre-throw-on pressure of left and right edger roll is 2000KN.The maximum play displacement of last horizontal roll 1 and/or following horizontal roll 2 is 0.2mm.The thick fluctuation range of leg of the F shaped steel product that makes in the present embodiment, is 0.2mm.
Present embodiment is substantially the same manner as Example 2.The difference of the two is the following aspects.
Upper and lower horizontal roll 1 is identical with 2 roller footpath and be 1300mm, and left and right edger roll 3 is directly identical with 4 roller footpath roller and be 880mm.The pre-throw-on pressure of left and right edger roll is 1800KN.The maximum play displacement of last horizontal roll 1 and/or following horizontal roll 2 is 0.3mm.The thick fluctuation range of leg of the F shaped steel product that makes in the present embodiment, is 0.2mm.
In the present invention, metal material is sensu lato metal material, and it comprises such as the metal of steel, aluminium, nickel, copper etc. with such as the alloy of titanium alloy, aluminium alloy, copper alloy etc.
In sum, according to the method and the rolling device of rolling asymmetric cross section shape of the present invention can be accurately also stable the size and the precision of control shape product, thereby improved the quality of product.
Although describe and explained technical conceive of the present invention above in conjunction with exemplary embodiment, but those skilled in the art should be clear, under the situation that does not break away from spirit and scope defined by the claims, can make various modifications and change to above-mentioned exemplary embodiment.
Claims (13)
1. the method for a rolling asymmetric cross section shape, it is characterized in that, in the operation of rolling, last horizontal roll and following horizontal roll rotate in opposite direction with moulding that metal material is nipped, be positioned at same vertical plane and the left edger roll that can vertically rotate and right edger roll with last horizontal roll and following horizontal roll simultaneously and be pressed against respectively on the left-hand face and right lateral surface of horizontal roll and following horizontal roll, to prevent horizontal roll and/or following horizontal roll play vertically.
2. the method for rolling asymmetric cross section shape as claimed in claim 1 is characterized in that, described asymmetric cross section shape is asymmetric shaped steel.
3. the method for rolling asymmetric cross section shape as claimed in claim 2 is characterized in that, described asymmetric shaped steel is F shaped steel.
4. as the method for claim 1 or 2 or 3 described rolling asymmetric cross section shapes, it is characterized in that the described roller of going up horizontal roll and following horizontal roll is directly identical and in the scope of 690～1400mm.
5. as the method for claim 1 or 2 or 3 described rolling asymmetric cross section shapes, it is characterized in that the roller of described left edger roll and right edger roll footpath is identical and in the scope of 510～980mm.
6. as the method for claim 1 or 2 or 3 described rolling asymmetric cross section shapes, it is characterized in that, described left edger roll and right edger roll apply the pre-throw-on pressure of horizontal direction to last horizontal roll and following horizontal roll, described pre-throw-on pressure can guarantee to go up horizontal roll and/or down the play displacement of horizontal roll be not more than 0.3mm.
7. as the method for claim 1 or 2 or 3 described rolling asymmetric cross section shapes, it is characterized in that, described method also is included in the operation of rolling, provides the step of rolled lubricating oil and the step that rolled lubricating oil is provided to the surface that the right lateral surface with last horizontal roll and following horizontal roll of described right edger roll contacts to the surface that the left-hand face with last horizontal roll and following horizontal roll of described left edger roll contacts.
8. rolling device, described rolling device comprises horizontal roll and following horizontal roll, it is characterized in that, also comprise the right edger roll that left edger roll that also can vertically rotate on the left-hand face that is pressed against horizontal roll and following horizontal roll and the surface, the right side that is pressed against horizontal roll and following horizontal roll upward also can vertically be rotated, and upward the center line of horizontal roll, following horizontal roll, left edger roll and right edger roll all is positioned at same vertical plane.
9. rolling device as claimed in claim 8, it is characterized in that, described left edger roll is installed in left edger roll case or the left shaft holder with on the left-hand face that is pressed against horizontal roll and following horizontal roll, and right edger roll is installed in right edger roll case or the right bearing seat with on the right lateral surface that is pressed against horizontal roll and following horizontal roll.
10. rolling device as claimed in claim 8 or 9 is characterized in that, is formed with the hole slot that is used for metal material is rolled into asymmetric section bar on the described circumferential surface of going up horizontal roll and following horizontal roll.
11. rolling device as claimed in claim 10 is characterized in that, described asymmetric section bar is a F shaped steel.
12., it is characterized in that the described roller of going up horizontal roll and following horizontal roll is directly identical and in the scope of 690～1400mm as claim 8 or 9 or 11 described rolling devices.
13., it is characterized in that the roller of described left edger roll and right edger roll footpath is identical and in the scope of 510～980mm as claim 8 or 9 or 11 described rolling devices.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105891004A CN102009065B (en) | 2010-12-15 | 2010-12-15 | Method and device for rolling metal section with asymmetric cross section |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105891004A CN102009065B (en) | 2010-12-15 | 2010-12-15 | Method and device for rolling metal section with asymmetric cross section |
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| Publication Number | Publication Date |
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| CN102009065A true CN102009065A (en) | 2011-04-13 |
| CN102009065B CN102009065B (en) | 2012-07-18 |
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| CN2010105891004A Expired - Fee Related CN102009065B (en) | 2010-12-15 | 2010-12-15 | Method and device for rolling metal section with asymmetric cross section |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103357663A (en) * | 2013-07-19 | 2013-10-23 | 莱芜钢铁集团有限公司 | F-shaped steel mill roll double-hole type and rolling method |
| CN104785528A (en) * | 2015-03-27 | 2015-07-22 | 山东钢铁股份有限公司 | Method for locating roll-gap-opening no-load channeling roll of UCM rolling mill |
| CN110328228A (en) * | 2019-07-18 | 2019-10-15 | 山东钢铁股份有限公司 | A kind of the three-roll rolling device and milling method of F fashioned iron |
| CN111098152A (en) * | 2019-12-31 | 2020-05-05 | 杭州华光焊接新材料股份有限公司 | Metal wire online processing equipment |
| CN112589155A (en) * | 2020-11-26 | 2021-04-02 | 广州众山精密科技有限公司 | Side jacking device of double-roller rolling mill |
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| JP2667722B2 (en) * | 1989-11-30 | 1997-10-27 | 川崎製鉄株式会社 | Method and apparatus for rolling asymmetric H-section steel |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103357663A (en) * | 2013-07-19 | 2013-10-23 | 莱芜钢铁集团有限公司 | F-shaped steel mill roll double-hole type and rolling method |
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| CN104785528A (en) * | 2015-03-27 | 2015-07-22 | 山东钢铁股份有限公司 | Method for locating roll-gap-opening no-load channeling roll of UCM rolling mill |
| CN104785528B (en) * | 2015-03-27 | 2016-08-24 | 山东钢铁股份有限公司 | Roll gap zero load roll shifting localization method opened by UCM milling train |
| CN110328228A (en) * | 2019-07-18 | 2019-10-15 | 山东钢铁股份有限公司 | A kind of the three-roll rolling device and milling method of F fashioned iron |
| CN111098152A (en) * | 2019-12-31 | 2020-05-05 | 杭州华光焊接新材料股份有限公司 | Metal wire online processing equipment |
| CN112589155A (en) * | 2020-11-26 | 2021-04-02 | 广州众山精密科技有限公司 | Side jacking device of double-roller rolling mill |
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| Publication number | Publication date |
|---|---|
| CN102009065B (en) | 2012-07-18 |
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Owner name: JINAN IRON AND STEEL CO LTD Free format text: FORMER OWNER: LAIWU IRON CO., LTD. Effective date: 20120405 |
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Address after: 271104 Laiwu Steel Technology Center, Gangcheng District, Shandong, Laiwu, China Applicant after: Laiwu Iron & Steel Co.,Ltd. Address before: 271104, Xinxing Road, Gangcheng District, Shandong, Laiwu, 21 Applicant before: Laiwu Iron & Steel Co.,Ltd. |
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Effective date of registration: 20120405 Address after: 250101 No. 21 industrial North Road, Shandong, Ji'nan, China Applicant after: JINAN IRON AND STEEL Co.,Ltd. Address before: 271104 Laiwu Steel Technology Center, Gangcheng District, Shandong, Laiwu, China Applicant before: Laiwu Iron & Steel Co.,Ltd. |
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| C53 | Correction of patent of invention or patent application | ||
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Address after: 250101 Ji'nan Industrial Road, Shandong, No. 21 Applicant after: SHANDONG IRON AND STEEL Co.,Ltd. Address before: 250101 No. 21 industrial North Road, Shandong, Ji'nan, China Applicant before: JINAN IRON AND STEEL Co.,Ltd. |
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Free format text: CORRECT: APPLICANT; FROM: JINAN IRON AND STEEL CO LTD TO: SHANDONG IRON AND STEEL CO., LTD. |
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Granted publication date: 20120718 Termination date: 20171215 |