CN113351643A - Rolling method for rapidly switching 150 and 165 square billets in bar and wire steel rolling production - Google Patents
Rolling method for rapidly switching 150 and 165 square billets in bar and wire steel rolling production Download PDFInfo
- Publication number
- CN113351643A CN113351643A CN202110428447.9A CN202110428447A CN113351643A CN 113351643 A CN113351643 A CN 113351643A CN 202110428447 A CN202110428447 A CN 202110428447A CN 113351643 A CN113351643 A CN 113351643A
- Authority
- CN
- China
- Prior art keywords
- rolling mill
- rolling
- billet
- elongation coefficient
- elongation
- Prior art date
- 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.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B39/14—Guiding, positioning or aligning work
- B21B39/16—Guiding, positioning or aligning work immediately before entering or after leaving the pass
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
Abstract
The invention discloses a rolling method for quickly switching 150 and 165 square billets in the production of steel rolling of bar and wire rods, wherein a 1# to 5# rolling mill adopts a non-hole type, a 6# rolling mill is a round hole type, the rolling method can realize the quick switching of 150 and 165 square billets by setting the reasonable pass reduction of the 1# to 6# rolling mill, adjusting the extension coefficient of each pass and replacing the inlet guide of the 1# rolling mill, compared with the original designed process method, the rolling method does not need to replace the 1# to 5# rolling mill or adjust the reduction and the guide device of the 1# to 5# rolling mill on line, the downtime is shortened to 10 minutes from 2 hours, the downtime is greatly shortened, the labor intensity of personnel and the number of spare machines are reduced, and the production efficiency is improved. In particular, in the rolling process of small-batch products, the reciprocating switching of 150mm and 165mm square billets among a plurality of steel grades is facilitated, and good economic benefits are generated.
Description
Technical Field
The invention belongs to the technical field of high-speed wire rod rolling, and particularly relates to a rolling method for rapidly switching 150 and 165 square billets in the production of steel rolling of rod and wire rods.
Background
At present, in the production of steel rolling of bar and wire rods, under the condition that a plurality of steel billet specifications exist, each steel billet specification corresponds to a group of rolling procedures, therefore, when the steel billet specifications are switched, the steel rolling process also needs to be adjusted, at present, a method for adjusting the material type and the speed before a common pass is basically adopted, therefore, a rolling mill before the common pass needs to be replaced, or the rolling reduction and a guide and guard device of each rolling mill before the common pass need to be adjusted on line, so that the downtime and the labor intensity of personnel can be increased, the production efficiency can be reduced, if the rolling mill is replaced integrally, the number of spare machines can be increased, the production cost of a workshop can be increased, and great pressure can be brought to equipment and management of an assembly workshop.
Therefore, the rolling process needs to be modified, the square billet specification is rapidly switched to be rolled in the bar and wire steel rolling production, the aims of reducing the downtime, reducing the production cost and the labor intensity of personnel and improving the production efficiency are achieved.
Disclosure of Invention
The invention aims to provide a rolling method for rapidly switching 150 and 165 square billets in the production of steel rolling of bar and wire rods, which can realize the rapid switching of 150 and 165 square billets for rolling by setting the reasonable pass reduction of a 1# to 6# rolling mill, only adjusting the extension coefficient of each pass and replacing the inlet guide of the 1# rolling mill, thereby greatly shortening the downtime, reducing the labor intensity of personnel and the number of spare machines and improving the production efficiency.
The technical scheme adopted by the invention is as follows: rolling on a horizontal and vertical alternative roughing mill, wherein the roughing mill has 6 frames in total, a 1# to 5# rolling mill adopts a non-hole type, a 6# rolling mill is a round hole type, when 150 and 165 square billets are switched, the pass reduction of the 1# to 6# rolling mill is selected, the extension coefficient of each pass is adjusted, and an inlet guide side guide plate of the 1# rolling mill is replaced; the size of the outlet red billet of the No. 6 rolling mill can be controlled to be
And (4) a circle.
The present invention is also characterized in that,
when 150 square billets are rolled, the size of the inlet guide side guide plate of the 1# rolling mill is 165 mm; when 165 square billets are rolled, the size of the inlet guide side guide plate of the 1# rolling mill is 180 mm.
When the size of the outlet red billet of the 6# rolling mill is equal to
When the round billet and the 150-165 square billet are rolled in a switching mode, the pass reduction of a 1# rolling mill to a 6# rolling mill does not need to be adjusted, the material type of the 1# rolling mill is 113mm high, the material type of the 2# rolling mill is 123mm high, the material type of the 3# rolling mill is 82mm high, the material type of the 4# rolling mill is 88mm high, the material type of the 5# rolling mill is 63mm high, and the material type of the 6# rolling mill is 80mm high.
When 150 square billets are rolled, the elongation coefficient of each pass is as follows: 1# rolling mill elongation coefficient 1.185, 2# rolling mill elongation coefficient 1.202, 3# rolling mill elongation coefficient 1.312, 4# rolling mill elongation coefficient 1.328, 5# rolling mill elongation coefficient 1.303, 6# rolling mill elongation coefficient 1.408.
When the square billet is rolled 165, the elongation coefficient of each pass is as follows: 1# rolling mill elongation coefficient 1.284, 2# rolling mill elongation coefficient 1.231, 3# rolling mill elongation coefficient 1.301, 4# rolling mill elongation coefficient 1.302, 5# rolling mill elongation coefficient 1.316, and 6# rolling mill elongation coefficient 1.447.
When the size of the outlet red billet of the 6# rolling mill is equal to
The pass reduction of the 1# to 6# rolling mill does not need to be adjusted, the material type of the 1# rolling mill is 113mm high, the material type of the 2# rolling mill is 113mm high, the material type of the 3# rolling mill is 78mm high, the material type of the 4# rolling mill is 83mm high, the material type of the 5# rolling mill is 58mm high, and the material type of the 6# rolling mill is 75mm high;
when 150 square billets are rolled, the elongation coefficient of each pass is as follows: 1# rolling mill elongation coefficient 1.195, 2# rolling mill elongation coefficient 1.275, 3# rolling mill elongation coefficient 1.306, 4# rolling mill elongation coefficient 1.318, 5# rolling mill elongation coefficient 1.359, 6# rolling mill elongation coefficient 1.392;
when the square billet is rolled 165, the elongation coefficient of each pass is as follows: 1# rolling mill elongation 1.279, 2# rolling mill elongation 1.352, 3# rolling mill elongation 1.359, 4# rolling mill elongation 1.299, 5# rolling mill elongation 1.365, 6# rolling mill elongation 1.441.
The value range of each extension coefficient is +/-0.03.
The invention has the beneficial effects that: the invention relates to a rolling method for quickly switching 150 and 165 square billets in the production of steel rolling of bar and wire rods, which is characterized in that rolling is carried out on a horizontally and vertically alternating roughing mill, wherein a 1# to 5# rolling mill adopts a non-hole type, a 6# rolling mill is a round hole type, the rolling method can realize the rolling of the 150 and 165 square billets by setting reasonable pass reduction of the 1# to 6# rolling mill, only adjusting the extension coefficient of each pass and replacing an inlet guide of the 1# rolling mill, compared with the original designed process method, the rolling method does not need to replace the 1# to 5# rolling mill or adjust the reduction and the guide device of the 1# to 5# rolling mill on line, the downtime is shortened to 10 minutes from 2 hours, the downtime is greatly shortened, the labor intensity of personnel and the number of spare machines are reduced, and the production efficiency is improved. In particular, in the rolling process of small-batch products, the reciprocating switching of 150mm and 165mm square billets among a plurality of steel grades is facilitated, and good economic benefits are generated.
Detailed Description
The present invention will be described in detail with reference to specific examples.
Examples 1150 and 165 Square billet switch Rolling
Rolling on a horizontal and vertical alternative roughing mill, wherein the roughing mill has 6 stands, a 1# to 5# rolling mill adopts a non-hole type, and a 6# rolling mill adopts a round hole type. When the size of the export red billet of the 6# rolling mill is required to be equal to
When the round billet and the 150 billet and the 165 billet are rolled in a switching mode, the pass reduction of a 1# rolling mill to a 6# rolling mill does not need to be adjusted, the material type of the 1# rolling mill is 113mm high, the material type of the 2# rolling mill is 113mm high, the material type of the 3# rolling mill is 78mm high, the material type of the 4# rolling mill is 83mm high, the material type of the 5# rolling mill is 58mm high, and the material type of the 6# rolling mill is 75mm high.
The elongation coefficient parameters of each pass are as follows:
when 150 square billets are rolled, the elongation coefficient of each pass is as follows: 1# rolling mill elongation 1.195, 2# rolling mill elongation 1.275, 3# rolling mill elongation 1.306, 4# rolling mill elongation 1.318, 5# rolling mill elongation 1.359, 6# rolling mill elongation 1.392.
When the square billet is rolled 165, the elongation coefficient of each pass is as follows: 1# rolling mill elongation 1.279, 2# rolling mill elongation 1.352, 3# rolling mill elongation 1.359, 4# rolling mill elongation 1.299, 5# rolling mill elongation 1.365, 6# rolling mill elongation 1.441.
When the rolling of 150 and 165 square billets is switched, only the inlet guide and guard device of the 1# rolling mill is replaced: when 150 square billets are rolled, the size of the inlet guide side guide plate of the 1# rolling mill is 165 mm; when 165 square billets are rolled, the size of the inlet guide side guide plate of the 1# rolling mill is 180 mm.
Examples 2150 and 165 Square billet switch Rolling
Rolling on a horizontal and vertical alternative roughing mill, wherein the roughing mill has 6 stands, a 1# to 5# rolling mill adopts a non-hole type, and a 6# rolling mill adopts a round hole type. When the size of the export red billet of the 6# rolling mill is required to be equal to
When the round billet and the 150-165 square billet are rolled in a switching mode, the pass reduction of a 1# rolling mill to a 6# rolling mill does not need to be adjusted, the material type of the 1# rolling mill is 113mm high, the material type of the 2# rolling mill is 123mm high, the material type of the 3# rolling mill is 82mm high, the material type of the 4# rolling mill is 88mm high, the material type of the 5# rolling mill is 63mm high, and the material type of the 6# rolling mill is 80mm high.
The elongation coefficient parameters of each pass are as follows:
when 150 square billets are rolled, the elongation coefficient of each pass is as follows: 1# rolling mill elongation coefficient 1.185, 2# rolling mill elongation coefficient 1.202, 3# rolling mill elongation coefficient 1.312, 4# rolling mill elongation coefficient 1.328, 5# rolling mill elongation coefficient 1.303, 6# rolling mill elongation coefficient 1.408.
When the square billet is rolled 165, the elongation coefficient of each pass is as follows: 1# rolling mill elongation coefficient 1.284, 2# rolling mill elongation coefficient 1.231, 3# rolling mill elongation coefficient 1.301, 4# rolling mill elongation coefficient 1.302, 5# rolling mill elongation coefficient 1.316, and 6# rolling mill elongation coefficient 1.447.
When the rolling of 150 and 165 square billets is switched, only the inlet guide and guard device of the 1# rolling mill is replaced: when 150 square billets are rolled, the size of the inlet guide side guide plate of the 1# rolling mill is 165 mm; when 165 square billets are rolled, the size of the inlet guide side guide plate of the 1# rolling mill is 180 mm.
The reduction amount of the invention means the material type is high.
Claims (6)
1. A rolling method for quickly switching 150 and 165 square billets in the production of rolled steel of bar and wire rods is characterized in that rolling is carried out on a horizontal and vertical alternating roughing mill, and roughing is carried outThe rolling mills have 6 frames in total, wherein the 1# to 5# rolling mill adopts a non-hole type, the 6# rolling mill is a round hole type, when 150 and 165 square billets are switched, the pass reduction of the 1# to 6# rolling mill is selected, the extension coefficient of each pass is adjusted, and the inlet guide side guide plate of the 1# rolling mill is replaced; the size of the outlet red billet of the No. 6 rolling mill can be controlled to be
And (4) a circle.
2. The rolling method for rapidly switching 150 and 165 billets in the steel rolling production of bar and wire rods according to claim 1, wherein when 150 billets are rolled, the size of the inlet guide side guide plate of the 1# rolling mill is 165 mm; when 165 square billets are rolled, the size of the inlet guide side guide plate of the 1# rolling mill is 180 mm.
3. The rolling method for fast switching between 150 and 165 billets in the production of rolled steel bar and wire rods as claimed in claim 1, wherein the size of the red billet at the outlet of the 6# rolling mill is equal to
When the round billet and the 150 billet and the 165 billet are rolled in a switching mode, the pass reduction of a 1# rolling mill to a 6# rolling mill does not need to be adjusted, the material type height of the 1# rolling mill is 113mm, the material type height of the 2# rolling mill is 113mm, the material type height of the 3# rolling mill is 78mm, the material type height of the 4# rolling mill is 83mm, the material type height of the 5# rolling mill is 58mm, the material type height of the 6# rolling mill is 75mm, and the reduction is the material type height.
4. The rolling method for fast switching between 150 and 165 billets in the production of rolled steel bar and wire rods as claimed in claim 1, wherein the size of the red billet at the outlet of the 6# rolling mill is equal to
When the round billet and the 150 billet and the 165 billet are rolled in a switching mode, the pass reduction of a 1# rolling mill to a 6# rolling mill does not need to be adjusted, the material type height of the 1# rolling mill is 113mm, the material type height of the 2# rolling mill is 123mm, the material type height of the 3# rolling mill is 82mm, the material type height of the 4# rolling mill is 88mm, the material type height of the 5# rolling mill is 63mm, the material type height of the 6# rolling mill is 80mm, and the reduction is the material type height.
5. The rolling method for fast switching between 150 and 165 billets in the production of rolled steel bar and wire rods as claimed in claim 4, wherein the size of the red billet at the outlet of the 6# rolling mill is equal to
When the round billet and the 150 square billet are rolled, the elongation coefficient of each pass is as follows: 1# rolling mill elongation coefficient 1.185, 2# rolling mill elongation coefficient 1.202, 3# rolling mill elongation coefficient 1.312, 4# rolling mill elongation coefficient 1.328, 5# rolling mill elongation coefficient 1.303, 6# rolling mill elongation coefficient 1.408;
when the square billet is rolled 165, the elongation coefficient of each pass is as follows: 1# rolling mill elongation coefficient 1.284, 2# rolling mill elongation coefficient 1.231, 3# rolling mill elongation coefficient 1.301, 4# rolling mill elongation coefficient 1.302, 5# rolling mill elongation coefficient 1.316, and 6# rolling mill elongation coefficient 1.447.
6. The rolling method for fast switching between 150 and 165 billets in the production of rolled steel bar and wire rods as claimed in claim 3, wherein the size of the red billet at the outlet of the 6# rolling mill is equal to
When the round billet and the 150 square billet are rolled, the elongation coefficient of each pass is as follows: 1# rolling mill elongation coefficient 1.195, 2# rolling mill elongation coefficient 1.275, 3# rolling mill elongation coefficient 1.306, 4# rolling mill elongation coefficient 1.318, 5# rolling mill elongation coefficient 1.359, 6# rolling mill elongation coefficient 1.392;
when the square billet is rolled 165, the elongation coefficient of each pass is as follows: 1# rolling mill elongation 1.279, 2# rolling mill elongation 1.352, 3# rolling mill elongation 1.359, 4# rolling mill elongation 1.299, 5# rolling mill elongation 1.365, 6# rolling mill elongation 1.441.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110428447.9A CN113351643B (en) | 2021-04-23 | 2021-04-23 | Rolling method for rapidly switching 150 and 165 square billets in bar and wire steel rolling production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110428447.9A CN113351643B (en) | 2021-04-23 | 2021-04-23 | Rolling method for rapidly switching 150 and 165 square billets in bar and wire steel rolling production |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113351643A true CN113351643A (en) | 2021-09-07 |
| CN113351643B CN113351643B (en) | 2022-12-02 |
Family
ID=77525386
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110428447.9A Active CN113351643B (en) | 2021-04-23 | 2021-04-23 | Rolling method for rapidly switching 150 and 165 square billets in bar and wire steel rolling production |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113351643B (en) |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4050280A (en) * | 1973-08-06 | 1977-09-27 | M.I.M. Rolling Consultants (H.K.) Limited | Rod rolling |
| JPS5868402A (en) * | 1981-10-17 | 1983-04-23 | Kobe Steel Ltd | Rolling method for wire rod and steel bar |
| JPS58125301A (en) * | 1982-01-21 | 1983-07-26 | Sumitomo Metal Ind Ltd | Rolling method of bar and wire rod |
| JPH0592201A (en) * | 1991-09-30 | 1993-04-16 | Nippon Steel Corp | Method for simultaneously rolling different kinds of steel/different sizes in multistrand mill |
| JP2001137933A (en) * | 1999-11-11 | 2001-05-22 | Daido Steel Co Ltd | Method and device for holding material on inlet side in grooveless rolling |
| CN101152654A (en) * | 2006-09-26 | 2008-04-02 | 宝山钢铁股份有限公司 | Non-groove rolling method for high speed wire bar intermediate rolling train |
| CN101176881A (en) * | 2007-11-23 | 2008-05-14 | 河北理工大学 | Plain-barreled roll rhomboidity rolling method |
| CN103341487A (en) * | 2013-07-01 | 2013-10-09 | 中冶赛迪工程技术股份有限公司 | High-speed wire rod compact type non-porous rolling production line and production method |
| CN104148380A (en) * | 2014-08-25 | 2014-11-19 | 武钢集团昆明钢铁股份有限公司 | Method for rolling rods with 150 square blanks and 165 square blanks through both rough rolling and intermediate rolling |
| CN108296283A (en) * | 2017-01-11 | 2018-07-20 | 中冶华天南京工程技术有限公司 | Ten passage anapsid bar rolling techniques |
| CN109550781A (en) * | 2018-11-23 | 2019-04-02 | 云南玉溪仙福钢铁（集团）有限公司 | Roughing grooveless rolling method |
| CN111618091A (en) * | 2020-06-19 | 2020-09-04 | 重庆钢铁股份有限公司 | Double-high-rod rolling system suitable for production of multiple specifications and sizes |
-
2021
- 2021-04-23 CN CN202110428447.9A patent/CN113351643B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4050280A (en) * | 1973-08-06 | 1977-09-27 | M.I.M. Rolling Consultants (H.K.) Limited | Rod rolling |
| JPS5868402A (en) * | 1981-10-17 | 1983-04-23 | Kobe Steel Ltd | Rolling method for wire rod and steel bar |
| JPS58125301A (en) * | 1982-01-21 | 1983-07-26 | Sumitomo Metal Ind Ltd | Rolling method of bar and wire rod |
| JPH0592201A (en) * | 1991-09-30 | 1993-04-16 | Nippon Steel Corp | Method for simultaneously rolling different kinds of steel/different sizes in multistrand mill |
| JP2001137933A (en) * | 1999-11-11 | 2001-05-22 | Daido Steel Co Ltd | Method and device for holding material on inlet side in grooveless rolling |
| CN101152654A (en) * | 2006-09-26 | 2008-04-02 | 宝山钢铁股份有限公司 | Non-groove rolling method for high speed wire bar intermediate rolling train |
| CN101176881A (en) * | 2007-11-23 | 2008-05-14 | 河北理工大学 | Plain-barreled roll rhomboidity rolling method |
| CN103341487A (en) * | 2013-07-01 | 2013-10-09 | 中冶赛迪工程技术股份有限公司 | High-speed wire rod compact type non-porous rolling production line and production method |
| CN104148380A (en) * | 2014-08-25 | 2014-11-19 | 武钢集团昆明钢铁股份有限公司 | Method for rolling rods with 150 square blanks and 165 square blanks through both rough rolling and intermediate rolling |
| CN108296283A (en) * | 2017-01-11 | 2018-07-20 | 中冶华天南京工程技术有限公司 | Ten passage anapsid bar rolling techniques |
| CN109550781A (en) * | 2018-11-23 | 2019-04-02 | 云南玉溪仙福钢铁（集团）有限公司 | Roughing grooveless rolling method |
| CN111618091A (en) * | 2020-06-19 | 2020-09-04 | 重庆钢铁股份有限公司 | Double-high-rod rolling system suitable for production of multiple specifications and sizes |
Non-Patent Citations (1)
| Title |
|---|
| 姜胜杰等: "珠海粤钢棒线材孔型共用的设计与应用", 《南方金属》 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113351643B (en) | 2022-12-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110116135B (en) | Endless rolling production method for rod and wire products | |
| CN108941196B (en) | Method for continuously rolling small-specification bar by using 200 large-section square billet | |
| CN105170646A (en) | Economical bar sizing production line and method | |
| CN111330971B (en) | Rolling line and rolling method for special steel large bar | |
| KR20130089240A (en) | Apparatus and method for production of metal elongated products | |
| CN104741409A (en) | Control method for continuous annealing non-oriented silicon steel transverse crease mark | |
| CN102389894B (en) | Rolling process of bismuth-containing free cutting steel | |
| CN108746213B (en) | Method for improving rolling stability of high-strength IF steel | |
| CN113351643B (en) | Rolling method for rapidly switching 150 and 165 square billets in bar and wire steel rolling production | |
| CN1747800A (en) | Method for milling thin and/or thick slabs made of steel materials into hot-rolled strip | |
| CN114951295A (en) | Split double-high-rod rolling system based on loop control | |
| CN112090960A (en) | Method for producing 400-500 MPa high-strength anti-seismic deformed steel bar by non-heating low-temperature slitting rolling | |
| CN102294356B (en) | The method and apparatus of casting and continuous rolling for manufacturing elongated metal rolled products | |
| CN114160574B (en) | Roll gap setting method of Darnily reducing sizing mill matched with wire rod Morgan rolling mill | |
| CN111266403B (en) | Process for rolling phi 15mm PSB830 twisted steel | |
| CN1475314A (en) | No heating processing method in bar steel continuous casting and continuous rolling process | |
| CN102513386B (en) | Emulsion spraying method and emulsion spraying system for producing steel types with yield strength higher than 400MPa | |
| CN112536321B (en) | Cold control method for small-specification bearing steel | |
| CN212384281U (en) | Double-high-rod controlled cold rolling system | |
| CN201244579Y (en) | Device for horizontally moving work roll of invertible cold rolling mill | |
| CN108160739B (en) | A kind of deformed steel processing method | |
| CN110695084A (en) | Production method of non-heating high-strength steel | |
| CN110883107B (en) | Rolling force energy checking and calculating method for common hot-rolled bar | |
| CN217342842U (en) | Protection protective tool for steel rolling production | |
| CN216574880U (en) | Double-guide steel rolling device of double-hole rolling mill |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |