CN114014220A - F steel for forklift gantry and rolling process - Google Patents
F steel for forklift gantry and rolling process Download PDFInfo
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- CN114014220A CN114014220A CN202111512023.7A CN202111512023A CN114014220A CN 114014220 A CN114014220 A CN 114014220A CN 202111512023 A CN202111512023 A CN 202111512023A CN 114014220 A CN114014220 A CN 114014220A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 90
- 239000010959 steel Substances 0.000 title claims abstract description 90
- 238000005096 rolling process Methods 0.000 title claims abstract description 54
- 238000001514 detection method Methods 0.000 claims description 19
- 238000005266 casting Methods 0.000 claims description 12
- 238000005520 cutting process Methods 0.000 claims description 12
- 239000002994 raw material Substances 0.000 claims description 12
- 239000011265 semifinished product Substances 0.000 claims description 12
- 230000007704 transition Effects 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 6
- 230000002441 reversible effect Effects 0.000 claims description 6
- 238000000034 method Methods 0.000 claims 2
- 238000003466 welding Methods 0.000 abstract description 4
- 238000005098 hot rolling Methods 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
- B66F9/075—Constructional features or details
- B66F9/08—Masts; Guides; Chains
-
- 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
- B21B1/08—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 structural sections, i.e. work of special cross-section, e.g. angle steel
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
- B21B38/04—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring thickness, width, diameter or other transverse dimensions of the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2261/00—Product parameters
- B21B2261/02—Transverse dimensions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2261/00—Product parameters
- B21B2261/20—Temperature
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transportation (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Metal Rolling (AREA)
Abstract
The invention belongs to the field of forklift gantries, and particularly relates to 'F' steel for a forklift gantry and a rolling process thereof. The novel F-shaped steel for the forklift gantry is formed by hot rolling, the rigidity of the gantry can be effectively improved by the designed outer web plate, the welding quality of a gantry connecting piece and various accessories is ensured, and the overall safety of the forklift gantry is improved.
Description
Technical Field
The invention relates to the technical field of forklift gantries, in particular to 'F' steel for a forklift gantry and a rolling process.
Background
The forklift mast is formed by welding steel plate welded section steel or hot rolled section steel, the existing common mast section steel comprises C type, F type and H type, is formed by combining C-C, C-J, H-H type and the like, and is used as a sliding track of a forklift system and used for fixing various accessories. Taking a three-stage forklift gantry as an example, the whole gantry system consists of three-section telescopic devices consisting of an outer gantry, a middle gantry and an inner gantry, when the gantry is lifted, the fork frame moves along the inner gantry, the inner gantry moves along the middle gantry, and the middle gantry moves along the outer gantry. When the forklift mast is manufactured by the F-shaped steel, the size precision, the strength and the welding performance of the F-shaped steel are particularly important for the quality of the whole forklift mast.
At present, the strength of F steel for the forklift mast is poor, and the rolling process is troublesome, so that the F steel for the forklift mast and the rolling process are provided for solving the problems.
Disclosure of Invention
Based on the defects in the prior art, the invention provides F steel for a forklift gantry and a rolling process.
The invention provides 'F' steel for a forklift mast, which comprises a web plate, wherein an inner flange is arranged at the top of the web plate, a connecting arc surface is arranged at the connecting part of one side of the inner flange and the web plate, a first outer flange is arranged at the top of the web plate, a second outer flange is arranged at the top of the web plate, the second outer flange is positioned at one side of the first outer flange, a boss is arranged at the connecting part of one side of the second outer flange and the web plate, and a transition arc surface is connected between the first outer flange and the second outer flange.
Preferably, the distance between the top of the first outer flange and the bottom of the web is set to h1, the distance between the transition arc and the bottom of the web is set to h2, and the distance between the top of the inner flange and the bottom of the web is set to h 3.
Preferably, the length of the web is set to be L1, the length of the inner flange is set to be L2, the length between the inner flange and the second outer flange is set to be L3, and the length between the first outer flange and the second outer flange is set to be L4.
A rolling process of F steel for a forklift mast comprises the following steps:
s1: preparing steel materials: selecting high-quality steel, and cutting by a cutting mechanism to obtain a raw material of the F-shaped steel for later use;
s2: casting blank treatment: continuously casting the raw material obtained in S1 to obtain a continuously cast slab;
s3: rough rolling treatment: preliminarily rolling the cast slab obtained in S2 by a roughing mill, thereby making it possible to move the rough rolled body;
s4: finish rolling treatment: finish rolling the rough rolling body obtained in the S3 through a plurality of groups of universal finish rolling machines to obtain an F-shaped steel semi-finished product;
s5: correcting: f-shaped steel can be obtained by straightening the F-shaped steel semi-finished product in S4 by a straightening machine;
s6: and (3) detection: the F-shaped steel obtained in S5 is detected by the detection system, so that the size, the size precision and the angle precision of the F-shaped steel can be detected, and qualified F-shaped steel can be obtained.
Preferably, the reversible cogging mill of the S2 roughing mill includes a plurality of asymmetric passes, and the asymmetric passes are asymmetric passes both in the upper and lower direction and in the left and right direction.
Preferably, the plurality of universal finishing mill groups in S4 include two universal finishing mills and two edgers, and the two universal finishing mills and the two edgers are arranged in a crossed manner.
Preferably, the temperature of the blank in the S2 is 1170-1280 ℃ when the blank enters the rough rolling mill.
Preferably, the detection accuracy in S6 is set to a dimensional accuracy ± 0.1mm and an angular accuracy ± 0.5 °.
The invention has the beneficial effects that: novel F shaped steel for fork truck portal adopts the hot rolling shaping, and the rigidity of portal can effectively be improved to the outer web of design, has ensured the welding quality of portal connecting piece and various annex simultaneously, improves fork truck portal's overall safety nature.
Drawings
FIG. 1 is a cross-sectional view of an "F" steel for a forklift mast according to the present invention;
fig. 2 is another cross-sectional view of the F steel for the forklift mast provided by the invention.
In the figure: 1. a web; 2. an inner flange; 3. connecting the cambered surface; 4. a first outer flange; 5. a second outer flange; 6. a boss; 7. a transitional arc surface;
Detailed Description
The present invention will be further illustrated with reference to the following specific examples.
Example one
The embodiment provides a fork truck is "F" steel for portal, including web 1, interior flange 2 is installed at the top of web 1, the junction of one side of interior flange 2 and web 1 sets up to be connected cambered surface 3, first outer flange 4 is installed at the top of web 1, second outer flange 5 is installed at the top of web 1, and second outer flange 5 is located one side of first outer flange 4, the junction of one side of second outer flange 5 and web 1 sets up to boss 6, be connected with transition arc surface 7 between first outer flange 4 and the second outer flange 5.
In this embodiment, the distance between the top of the first outer flange 4 and the bottom of the web 1 is set to h1, the distance between the transition arc surface 7 and the bottom of the web 1 is set to h2, and the distance between the top of the inner flange 2 and the bottom of the web 1 is set to h 3.
In the present embodiment, the length of the web 1 is set to L1, the length of the inner flange 2 is set to L2, the length between the inner flange 2 and the second outer flange 5 is set to L3, and the length between the first outer flange 4 and the second outer flange 5 is set to L4.
A rolling process of F steel for a forklift mast comprises the following steps:
s1: preparing steel materials: selecting high-quality steel, and cutting by a cutting mechanism to obtain a raw material of the F-shaped steel for later use;
s2: casting blank treatment: continuously casting the raw material obtained in S1 to obtain a continuously cast slab;
s3: rough rolling treatment: preliminarily rolling the cast slab obtained in S2 by a roughing mill, thereby making it possible to move the rough rolled body;
s4: finish rolling treatment: finish rolling the rough rolling body obtained in the S3 through a plurality of groups of universal finish rolling machines to obtain an F-shaped steel semi-finished product;
s5: correcting: f-shaped steel can be obtained by straightening the F-shaped steel semi-finished product in S4 by a straightening machine;
s6: and (3) detection: the F-shaped steel obtained in S5 is detected by the detection system, so that the size, the size precision and the angle precision of the F-shaped steel can be detected, and qualified F-shaped steel can be obtained.
In this embodiment, the reversible cogging mill of the S2 roughing mill includes a plurality of asymmetric passes, which are asymmetric passes both up and down and left and right.
In this embodiment, the plurality of universal finishing mill groups in S4 includes two universal finishing mills and two edgers, and the two universal finishing mills and the two edgers are disposed in a crossing manner.
In this example, the temperature of the billet in S2 when entering the roughing mill was 1170 ℃.
In this embodiment, the detection accuracy in S6 is set to the dimensional accuracy ± 0.1mm, and the angular accuracy ± 0.5 °.
Example two
The embodiment provides a fork truck is "F" steel for portal, including web 1, interior flange 2 is installed at the top of web 1, the junction of one side of interior flange 2 and web 1 sets up to be connected cambered surface 3, first outer flange 4 is installed at the top of web 1, second outer flange 5 is installed at the top of web 1, and second outer flange 5 is located one side of first outer flange 4, the junction of one side of second outer flange 5 and web 1 sets up to boss 6, be connected with transition arc surface 7 between first outer flange 4 and the second outer flange 5.
In this embodiment, the distance between the top of the first outer flange 4 and the bottom of the web 1 is set to h1, the distance between the transition arc surface 7 and the bottom of the web 1 is set to h2, and the distance between the top of the inner flange 2 and the bottom of the web 1 is set to h 3.
In the present embodiment, the length of the web 1 is set to L1, the length of the inner flange 2 is set to L2, the length between the inner flange 2 and the second outer flange 5 is set to L3, and the length between the first outer flange 4 and the second outer flange 5 is set to L4.
A rolling process of F steel for a forklift mast comprises the following steps:
s1: preparing steel materials: selecting high-quality steel, and cutting by a cutting mechanism to obtain a raw material of the F-shaped steel for later use;
s2: casting blank treatment: continuously casting the raw material obtained in S1 to obtain a continuously cast slab;
s3: rough rolling treatment: preliminarily rolling the cast slab obtained in S2 by a roughing mill, thereby making it possible to move the rough rolled body;
s4: finish rolling treatment: finish rolling the rough rolling body obtained in the S3 through a plurality of groups of universal finish rolling machines to obtain an F-shaped steel semi-finished product;
s5: correcting: f-shaped steel can be obtained by straightening the F-shaped steel semi-finished product in S4 by a straightening machine;
s6: and (3) detection: the F-shaped steel obtained in S5 is detected by the detection system, so that the size, the size precision and the angle precision of the F-shaped steel can be detected, and qualified F-shaped steel can be obtained.
In this embodiment, the reversible cogging mill of the S2 roughing mill includes a plurality of asymmetric passes, which are asymmetric passes both up and down and left and right.
In this embodiment, the plurality of universal finishing mill groups in S4 includes two universal finishing mills and two edgers, and the two universal finishing mills and the two edgers are disposed in a crossing manner.
In this example, the temperature of the billet at the time of entering the roughing mill in S2 was 1200 ℃.
In this embodiment, the detection accuracy in S6 is set to the dimensional accuracy ± 0.1mm, and the angular accuracy ± 0.5 °.
EXAMPLE III
The embodiment provides a fork truck is "F" steel for portal, including web 1, interior flange 2 is installed at the top of web 1, the junction of one side of interior flange 2 and web 1 sets up to be connected cambered surface 3, first outer flange 4 is installed at the top of web 1, second outer flange 5 is installed at the top of web 1, and second outer flange 5 is located one side of first outer flange 4, the junction of one side of second outer flange 5 and web 1 sets up to boss 6, be connected with transition arc surface 7 between first outer flange 4 and the second outer flange 5.
In this embodiment, the distance between the top of the first outer flange 4 and the bottom of the web 1 is set to h1, the distance between the transition arc surface 7 and the bottom of the web 1 is set to h2, and the distance between the top of the inner flange 2 and the bottom of the web 1 is set to h 3.
In the present embodiment, the length of the web 1 is set to L1, the length of the inner flange 2 is set to L2, the length between the inner flange 2 and the second outer flange 5 is set to L3, and the length between the first outer flange 4 and the second outer flange 5 is set to L4.
A rolling process of F steel for a forklift mast comprises the following steps:
s1: preparing steel materials: selecting high-quality steel, and cutting by a cutting mechanism to obtain a raw material of the F-shaped steel for later use;
s2: casting blank treatment: continuously casting the raw material obtained in S1 to obtain a continuously cast slab;
s3: rough rolling treatment: preliminarily rolling the cast slab obtained in S2 by a roughing mill, thereby making it possible to move the rough rolled body;
s4: finish rolling treatment: finish rolling the rough rolling body obtained in the S3 through a plurality of groups of universal finish rolling machines to obtain an F-shaped steel semi-finished product;
s5: correcting: f-shaped steel can be obtained by straightening the F-shaped steel semi-finished product in S4 by a straightening machine;
s6: and (3) detection: the F-shaped steel obtained in S5 is detected by the detection system, so that the size, the size precision and the angle precision of the F-shaped steel can be detected, and qualified F-shaped steel can be obtained.
In this embodiment, the reversible cogging mill of the S2 roughing mill includes a plurality of asymmetric passes, which are asymmetric passes both up and down and left and right.
In this embodiment, the plurality of universal finishing mill groups in S4 includes two universal finishing mills and two edgers, and the two universal finishing mills and the two edgers are disposed in a crossing manner.
In this example, the temperature of the billet at the time of entering the roughing mill in S2 was 1250 ℃.
In this embodiment, the detection accuracy in S6 is set to the dimensional accuracy ± 0.1mm, and the angular accuracy ± 0.5 °.
Example four
The embodiment provides 'F' steel for a forklift mast, which comprises a web plate 1, wherein an inner flange 2 is installed at the top of the web plate 1, a connection arc surface 3 is arranged at the joint of one side of the inner flange 2 and the web plate 1, a first outer flange 4 is installed at the top of the web plate 1, a second outer flange 5 is installed at the top of the web plate 1, the second outer flange 5 is positioned at one side of the first outer flange 4, a boss 6 is arranged at the joint of one side of the second outer flange 5 and the web plate 1, a transition arc surface 7 is connected between the first outer flange 4 and the second outer flange 5, the distance between the top of the first outer flange 4 and the bottom of the web plate 1 is h1, the distance between the transition arc surface 7 and the bottom of the web plate 1 is h2, the distance between the top of the inner flange 2 and the bottom of the web plate 1 is h3, the length of the web plate 1 is L1, the length of the inner flange 2 is L2, and the length between the inner flange 2 and the second outer flange 5 is L3, the length between the first outer flange 4 and the second outer flange 5 is set to L4.
A rolling process of F steel for a forklift mast comprises the following steps:
s1: preparing steel materials: selecting high-quality steel, and cutting by a cutting mechanism to obtain a raw material of the F-shaped steel for later use;
s2: casting blank treatment: continuously casting the raw material obtained in S1 to obtain a continuously cast slab;
s3: rough rolling treatment: preliminarily rolling the cast slab obtained in S2 by a roughing mill, thereby making it possible to move the rough rolled body;
s4: finish rolling treatment: finish rolling the rough rolling body obtained in the S3 through a plurality of groups of universal finish rolling machines to obtain an F-shaped steel semi-finished product;
s5: correcting: f-shaped steel can be obtained by straightening the F-shaped steel semi-finished product in S4 by a straightening machine;
s6: and (3) detection: the F-shaped steel obtained in S5 is detected by the detection system, so that the size, the size precision and the angle precision of the F-shaped steel can be detected, and qualified F-shaped steel can be obtained.
In the embodiment, the reversible cogging mill of the S2 roughing mill comprises a plurality of asymmetric pass, the asymmetric pass is asymmetric up and down and left and right, the plurality of universal finishing mill groups in the S4 comprise two universal finishing mills and two edgers, the two universal finishing mills and the two edgers are arranged in a crossed manner, the temperature of a blank entering the roughing mill in the S2 is 1250 ℃, the detection precision in the S6 is set to be +/-0.1 mm of dimensional precision, and +/-0.5 DEG of angular precision
In this embodiment, the contained angle between interior flange 2 and the web 1 sets up to 90, and is provided with the arcwall face that a plurality of diameters are R4 on the interior flange 2, is provided with the arcwall face that a plurality of diameters are R5 on first interior flange 4 and the second outer interior flange 5, connects the arcwall face 3 diameter and sets up to R5, L1's length sets up to 180mm, and L2's length sets up to 22mm, L3's length sets up to 90mm, L4's length sets up to 68mm, h 1's length sets up to 56mm, and h 2's length sets up to 30mm, h 3's length sets up to 47 mm.
F-shaped steel prepared in the first to fourth embodiments is selected for detection, and the table shows that:
| examples | Elongation (%) | Tensile strength Rm | Hardness (HB) |
| Example one | 21.8 | 754 | 240 |
| Example two | 22.1 | 760 | 245 |
| EXAMPLE III | 22.5 | 763 | 246 |
| Example four | 22.8 | 766 | 247 |
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (8)
1. The utility model provides a fork truck is "F" steel for portal, a serial communication port, including web (1), interior flange (2) are installed at the top of web (1), the junction of one side of interior flange (2) and web (1) sets up to connecting cambered surface (3), first outer flange (4) are installed at the top of web (1), second outer flange (5) are installed at the top of web (1), just second outer flange (5) are located one side of first outer flange (4), one side of second outer flange (5) sets up to boss (6) with the junction of web (1), be connected with transition arc surface (7) between first outer flange (4) and the second outer flange (5).
2. The steel for the forklift mast "F" according to claim 1, wherein the distance between the top of the first outer flange (4) and the bottom of the web (1) is h1, the distance between the transition arc surface (7) and the bottom of the web (1) is h2, and the distance between the top of the inner flange (2) and the bottom of the web (1) is h 3.
3. The steel for forklift mast "F" according to claim 1, wherein the length of the web (1) is set to L1, the length of the inner flange (2) is set to L2, the length between the inner flange (2) and the second outer flange (5) is set to L3, and the length between the first outer flange (4) and the second outer flange (5) is set to L4.
4. The rolling process of the F steel for the forklift mast is characterized by comprising the following steps of:
s1: preparing steel materials: selecting high-quality steel, and cutting by a cutting mechanism to obtain a raw material of the F-shaped steel for later use;
s2: casting blank treatment: continuously casting the raw material obtained in S1 to obtain a continuously cast slab;
s3: rough rolling treatment: preliminarily rolling the cast slab obtained in S2 by a roughing mill, thereby making it possible to move the rough rolled body;
s4: finish rolling treatment: finish rolling the rough rolling body obtained in the S3 through a plurality of groups of universal finish rolling machines to obtain an F-shaped steel semi-finished product;
s5: correcting: f-shaped steel can be obtained by straightening the F-shaped steel semi-finished product in S4 by a straightening machine;
s6: and (3) detection: the F-shaped steel obtained in S5 is detected by the detection system, so that the size, the size precision and the angle precision of the F-shaped steel can be detected, and qualified F-shaped steel can be obtained.
5. The process for rolling the F steel for the forklift mast according to claim 4, wherein the S2 roughing mill reversible cogging mill comprises a plurality of asymmetric passes, and the asymmetric passes are asymmetric in upper and lower directions and in left and right directions.
6. The process for rolling the F steel for the forklift mast as claimed in claim 4, wherein the plurality of universal finishing mill groups in S4 comprises two universal finishing mills and two edgers, and the two universal finishing mills and the two edgers are arranged in a crossed manner.
7. The rolling process of the F steel for the forklift mast is characterized in that the temperature of the blank entering the roughing mill in the S2 is 1170-1280 ℃.
8. The rolling process of the F steel for the forklift mast as claimed in claim 4, wherein the detection precision in the S6 is set to be within a dimensional precision of +/-0.1 mm and an angular precision of +/-0.5 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111512023.7A CN114014220A (en) | 2021-12-07 | 2021-12-07 | F steel for forklift gantry and rolling process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111512023.7A CN114014220A (en) | 2021-12-07 | 2021-12-07 | F steel for forklift gantry and rolling process |
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| CN114014220A true CN114014220A (en) | 2022-02-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111512023.7A Pending CN114014220A (en) | 2021-12-07 | 2021-12-07 | F steel for forklift gantry and rolling process |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5656702A (en) * | 1979-10-12 | 1981-05-18 | Kawasaki Steel Corp | Blooming method for rough shaped steel billet |
| CN101214494A (en) * | 2007-12-29 | 2008-07-09 | 莱芜钢铁集团有限公司 | Technique for rolling figured steel for magnetic suspension train rail |
| CN111215445A (en) * | 2020-03-02 | 2020-06-02 | 山东钢铁股份有限公司 | Special-shaped F-shaped steel, production line and production method |
-
2021
- 2021-12-07 CN CN202111512023.7A patent/CN114014220A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5656702A (en) * | 1979-10-12 | 1981-05-18 | Kawasaki Steel Corp | Blooming method for rough shaped steel billet |
| CN101214494A (en) * | 2007-12-29 | 2008-07-09 | 莱芜钢铁集团有限公司 | Technique for rolling figured steel for magnetic suspension train rail |
| CN111215445A (en) * | 2020-03-02 | 2020-06-02 | 山东钢铁股份有限公司 | Special-shaped F-shaped steel, production line and production method |
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