CN114749481A - Hot rolling production process of 60-degree angle steel for iron tower - Google Patents
Hot rolling production process of 60-degree angle steel for iron tower Download PDFInfo
- Publication number
- CN114749481A CN114749481A CN202210360866.8A CN202210360866A CN114749481A CN 114749481 A CN114749481 A CN 114749481A CN 202210360866 A CN202210360866 A CN 202210360866A CN 114749481 A CN114749481 A CN 114749481A
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- China
- Prior art keywords
- angle steel
- degree angle
- rolling
- production process
- hot rolling
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Classifications
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- 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
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- 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
- B21B1/10—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 in a single two-high or universal rolling mill stand
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
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- 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
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
Abstract
The invention relates to a hot rolling production process of 60-degree angle steel for an iron tower, wherein the 60-degree angle steel is formed by heating a steel billet, ensuring the shape and the size of a final section by adopting a roll pass and performing one-step rolling, and specifically comprises the working procedures of continuous casting, heating, rolling, slow cooling and straightening. The process for producing the 60-degree angle steel is hot rolling, so that the material utilization rate is high, the cold bending process is omitted, the production efficiency is high, and the production cost is low; the integral residual stress is small, and the fatigue resistance is excellent; the fillet of the vertex angle part is small, and the fillet is more sufficient than cold bending and has large section modulus.
Description
Technical Field
The invention belongs to the field of metal processing, relates to a rolling process of a section, and particularly relates to a hot rolling production process of angle steel with an included angle of 60 degrees for an iron tower.
Background
At present, angle steel is widely applied to extra-high voltage transmission towers and communication towers, and is mainly right-angle steel, namely 90-degree angle steel; the right angle steel is produced by adopting a hot rolling process, and has the characteristics of high production efficiency, good quality stability and the like. The angle iron assembled by adopting the angle steel of 60 degrees has the characteristics of material saving, good instability resistance and the like, and a great deal of research is carried out by many scientific research institutes and colleges.
The 60-degree angle steel in the prior art is formed by cold bending a hot rolled plate, and the cold-bent angle steel has the following defects:
1. the production process of cutting and cold bending by a hot rolled plate has high cost;
2. the material utilization rate is low;
3. the thickness of the vertex angle part is reduced due to cold bending, and the section modulus is reduced;
4. the residual stress at the vertex angle part is large, so that the angle steel is unstable and the fatigue performance is reduced;
5. the thickness of the edge of the angle steel is limited by a cold bending process, and the bent parts at two ends of the angle steel are easy to crack after the thickness of the plate is increased.
Disclosure of Invention
The invention aims to provide a hot rolling production process of 60-degree angle steel for an iron tower, which adopts a hot rolling process to roll and form continuous casting billets at one time through a roll pass so as to achieve the final section shape and size, has high material utilization rate, omits a cold bending process and has low production cost; the 60-degree angle steel has small residual stress and excellent fatigue resistance.
In order to achieve the purpose, the invention adopts the following technical scheme:
a hot rolling production process of 60-degree angle steel for an iron tower is characterized in that the 60-degree angle steel is formed by heating a steel billet and adopting a one-step rolling process, and specifically comprises the working procedures of continuous casting, heating, rolling, slow cooling and straightening.
The method specifically comprises the following steps:
1) heating: heating from room temperature, controlling the heating time to be 80-400 min according to different cross section sizes of casting blanks, and controlling the tapping temperature to be 1150-1300 ℃;
2) rolling: the initial rolling temperature is controlled to be 1150-1300 ℃, and the final rolling temperature is controlled to be 780-880 ℃;
3) the reduction rate is as follows: the accumulated reduction rate is more than or equal to 50 percent;
4) slow cooling: naturally cooling in air;
5) straightening: the straightening temperature is controlled to be 10-60 ℃.
Continuous casting billets are selected, and the cross sections of the casting billets are square or rectangular.
The section size of the 60-degree angle steel is formed by extruding a blank through a cavity formed by matching an upper roller and a lower roller.
The form of the rolling mill is selected from a two-roller reversible type, a universal continuous rolling type or a combination of the two-roller reversible type and the universal continuous rolling type.
The angle steel is applied to a power transmission or communication tower, and the angle steel vertex angle theta is 60 degrees +/-50'.
Compared with the prior art, the invention has the beneficial effects that:
1) the invention adopts the hot rolling process to roll and form the continuous casting billet in one step, the material utilization rate is high, the cold bending process is omitted, and the production cost is low;
2) the hot-rolled 60-degree angle steel has small residual stress and excellent fatigue resistance; the cold bending process adopts hot rolled steel plates, and the cold bending process is formed by cutting and bending, so that plastic deformation is generated during bending, large stress is generated at a bending part, and welding and fatigue performances are reduced after the stress is increased.
3) The hot-rolled 60-degree angle steel has more sufficient top angle, small fillet, greater section modulus of the same side thickness than that of a cold bending process and good anti-instability performance;
4) the hot rolling process of the invention produces the 60-degree angle steel, has stable product quality and good consistency, is suitable for producing various specifications and is beneficial to popularization.
5) The low-alloy 60-degree angle steel is rolled according to the production process, the final rolling temperature is in a normalizing treatment temperature range, the metallographic structure is ferrite and a small amount of pearlite, and the angle steel with low residual stress and high performance can be obtained.
6) The grain size of the finished product of the angle steel can reach more than 8 grades by rolling the angle steel with 60 degrees according to the production process.
Drawings
Fig. 1 is a schematic view of a cold-bent 60 ° angle steel.
FIG. 2 is a schematic view of 60 ° angle steel produced by the hot rolling process of the present invention.
In the figure: 1-apex angle.
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings:
a hot rolling production process of 60-degree angle steel for an iron tower is characterized in that the 60-degree angle steel is formed by heating a steel billet and adopting a one-step rolling process, and specifically comprises the working procedures of continuous casting, heating, rolling, slow cooling and straightening.
The method specifically comprises the following steps:
1) heating: heating from room temperature, controlling the heating time to be 80-400 min according to different cross section sizes of casting blanks, and controlling the tapping temperature to be 1150-1300 ℃;
2) Rolling: the initial rolling temperature is controlled to be 1150-1300 ℃, and the final rolling temperature is controlled to be 780-880 ℃;
3) the reduction rate is as follows: the accumulated reduction rate is more than or equal to 50 percent;
4) slow cooling: naturally cooling in air;
5) straightening: the straightening temperature is controlled to be 10-60 ℃.
Continuous casting billets are selected, and the cross sections of the casting billets are square or rectangular.
The section size of the 60-degree angle steel is formed by extruding a blank through a cavity formed by matching an upper roller and a lower roller.
The form of the rolling mill is selected from a two-roller reversible type, a universal continuous rolling type or a combination of the two-roller reversible type and the universal continuous rolling type.
The angle steel is applied to a power transmission or communication tower, and the angle steel vertex angle theta is 60 degrees +/-50'.
Preferably, in the step 2), a multi-stage walking beam furnace is used.
As shown in fig. 1 and 2, compared with the 60-degree angle steel produced by the cold bending process, the 60-degree angle steel produced by the hot rolling process has the advantages that the top angle 1 is full, almost no round angle exists, compared with the cold bending angle steel with the same side thickness, the section modulus is larger, the anti-buckling performance is better, and as shown in the figure, the actual width b of the angle steel is wider under the condition that d is the same.
Claims (6)
1. A hot rolling production process of 60-degree angle steel for an iron tower is characterized in that the 60-degree angle steel is formed by heating a steel billet and rolling the steel billet at one time, and specifically comprises the working procedures of continuous casting, heating, rolling, slow cooling and straightening.
2. The hot rolling production process of 60-degree angle steel for the iron tower according to claim 1, which is characterized by comprising the following steps of:
1) heating: heating from room temperature, controlling the heating time to be 80-400 min, and controlling the tapping temperature to be 1150-1300 ℃;
2) rolling: the initial rolling temperature is controlled to be 1150-1300 ℃, and the final rolling temperature is controlled to be 780-880 ℃;
3) the reduction rate is as follows: the accumulated reduction rate is more than or equal to 50 percent;
4) slow cooling: naturally cooling in air;
5) straightening: the straightening temperature is controlled to be 10-60 ℃.
3. The hot rolling production process of 60-degree angle steel for iron towers according to claim 2, characterized in that continuous casting billets are selected, and the cross section of the casting billets is square or rectangular.
4. The hot rolling production process of 60-degree angle steel for iron towers according to claim 2, wherein the form of the rolling mill is selected from a two-roll reversible type, a universal continuous rolling type or a combination of the two-roll reversible type and the universal continuous rolling type.
5. The hot rolling production process of the 60-degree angle steel for the iron tower according to claim 1, wherein the cross-sectional dimension of the 60-degree angle steel is formed by a cavity extrusion blank formed by matching an upper roller and a lower roller.
6. The hot rolling production process of 60-degree angle iron for iron towers according to claim 1 or 2, wherein the angle iron is applied to power transmission or communication towers, and the angle iron vertex angle theta is 60 degrees +/-50'.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210360866.8A CN114749481A (en) | 2022-04-07 | 2022-04-07 | Hot rolling production process of 60-degree angle steel for iron tower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210360866.8A CN114749481A (en) | 2022-04-07 | 2022-04-07 | Hot rolling production process of 60-degree angle steel for iron tower |
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| Publication Number | Publication Date |
|---|---|
| CN114749481A true CN114749481A (en) | 2022-07-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210360866.8A Pending CN114749481A (en) | 2022-04-07 | 2022-04-07 | Hot rolling production process of 60-degree angle steel for iron tower |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4433565A (en) * | 1978-03-30 | 1984-02-28 | Theodor Wuppermann Gmbh | Method of and apparatus for the manufacturing of metal profile members, especially steel profile members |
| JP2001073069A (en) * | 1999-09-07 | 2001-03-21 | Kawasaki Steel Corp | High productivity and high strength rolled wide flange shape and its production |
| CN102851584A (en) * | 2012-04-20 | 2013-01-02 | 宿迁南钢金鑫轧钢有限公司 | Niobium-containing large-sized high-strength angle iron and production technology thereof |
| CN103590646A (en) * | 2013-11-11 | 2014-02-19 | 国家电网公司 | Triangular fracture surface angle steel tower for power transmission line |
| CN105886961A (en) * | 2016-06-07 | 2016-08-24 | 蒋南宁 | High-performance hot-rolled H-shape steel capable of resisting marine atmospheric environment corrosion and preparation method thereof |
-
2022
- 2022-04-07 CN CN202210360866.8A patent/CN114749481A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4433565A (en) * | 1978-03-30 | 1984-02-28 | Theodor Wuppermann Gmbh | Method of and apparatus for the manufacturing of metal profile members, especially steel profile members |
| JP2001073069A (en) * | 1999-09-07 | 2001-03-21 | Kawasaki Steel Corp | High productivity and high strength rolled wide flange shape and its production |
| CN102851584A (en) * | 2012-04-20 | 2013-01-02 | 宿迁南钢金鑫轧钢有限公司 | Niobium-containing large-sized high-strength angle iron and production technology thereof |
| CN103590646A (en) * | 2013-11-11 | 2014-02-19 | 国家电网公司 | Triangular fracture surface angle steel tower for power transmission line |
| CN105886961A (en) * | 2016-06-07 | 2016-08-24 | 蒋南宁 | High-performance hot-rolled H-shape steel capable of resisting marine atmospheric environment corrosion and preparation method thereof |
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