CN112692053A - Steel rolling process of vanadium-titanium steel bar - Google Patents
Steel rolling process of vanadium-titanium steel bar Download PDFInfo
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- CN112692053A CN112692053A CN202011434674.4A CN202011434674A CN112692053A CN 112692053 A CN112692053 A CN 112692053A CN 202011434674 A CN202011434674 A CN 202011434674A CN 112692053 A CN112692053 A CN 112692053A
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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
- B21B1/16—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
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- 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
- B21B15/0007—Cutting or shearing the product
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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
-
- 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
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/004—Heating the product
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
Abstract
The invention discloses a steel rolling process of a vanadium-titanium steel bar, which comprises the following steps: (1) feeding a steel billet into a furnace: conveying the continuously cast and cut steel billet into a heating furnace, wherein the continuous casting temperature is 1400-1500 ℃, and the continuous casting speed is 1.5-2.0 m/min; (2) heating: and (2) heating the steel billet in the step (1) in a heating furnace, wherein the heating comprises a preheating section and a heating section, the preheating is slow heating, the heating temperature is 600-700 ℃, the heating time is 60-90 minutes, the heating section is rapid heating, the heating temperature is 950-1000 ℃, and the heating time is 30-60 minutes. (3) Steel billet tapping: tapping the steel billet heated in the step (2) through a tapping machine; (4) rolling: and (4) rolling the steel billet tapped in the step (3), wherein the rolling comprises rough rolling, head cutting, intermediate rolling, pre-finish rolling, finish rolling and tail cutting. The steel bar obtained by the invention has stable performance and uniform structure, and can obviously improve the strength and the plastic toughness of the steel bar.
Description
Technical Field
The invention relates to a process flow, in particular to a steel rolling process of a vanadium-titanium steel bar.
Background
Steel rolling refers to a press working process in which metal is compressed between rotating rolls to produce plastic deformation. The purpose of steel rolling is to obtain a steel material with a desired shape, and to improve the internal quality and mechanical properties of the steel.
The rolling production process flow (rolling process now) is a combination and sequence of a series of processes required for sharpening steel or rolling a steel slab into a steel product having a certain shape, size and properties. The production process flow is different for different rolled products. The establishment of the production process flow of steel rolling is one of the important items of the design of a steel rolling workshop. At present, the production process flow of steel rolling can be summarized into 3 basic diagrams, namely a carbon steel (low alloy steel) hot rolling production process flow diagram, an alloy steel hot rolling production process flow diagram and a cold working production process flow diagram. In the carbon steel production process flow diagram, if the same steel is produced, different process flows can be adopted, but the technical and economic effects obtained by the process flows are different. Therefore, when the product process flow is formulated, the required processes, the sequence of the process arrangement, the specific content of each process and the parameters thereof are correctly selected, so that the aims of high yield, high quality and low consumption can be achieved.
For the rolling process of the vanadium-titanium steel bar, because the deformation condition of the vanadium-titanium steel bar is greatly different from that of the plate strip, the shearing stress borne by the plate strip in the rolling process is very large, the steel bar is subjected to multidirectional stress, and the local stress is relatively small.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a steel rolling process of a vanadium-titanium steel bar under the conditions of resource saving and existing production, which can obviously improve the performance of the steel bar, and improve the strength grade and the use efficiency.
The technical scheme of the invention is as follows:
a steel rolling process of a vanadium-titanium steel bar comprises the following steps:
(1) feeding a steel billet into a furnace: conveying the continuously cast and cut steel billet into a heating furnace, wherein the continuous casting temperature is 1400-1500 ℃, and the continuous casting speed is 1.5-2.0 m/min;
(2) heating: and (2) heating the steel billet in the step (1) in a heating furnace, wherein the heating comprises a preheating section and a heating section, the preheating is slow heating, the heating temperature is 600-700 ℃, the heating time is 60-90 minutes, the heating section is rapid heating, the heating temperature is 950-1000 ℃, and the heating time is 30-60 minutes.
(3) Steel billet tapping: tapping the steel billet heated in the step (2) through a tapping machine;
(4) rolling: rolling the steel billet tapped in the step (3), wherein the rolling comprises rough rolling, head cutting, intermediate rolling, pre-finish rolling, finish rolling and tail cutting;
(5) and (3) finishing: and (4) carrying out multiple-length flying shear, cooling and inspection on the billet rolled in the step (4).
Preferably, the continuous casting temperature of the step (1) is 1450 ℃.
Preferably, the drawing speed of the continuous casting of the step (1) is 1.8 m/min;
preferably, the initial rolling temperature before the rough rolling in the step (4) is 900-.
Preferably, the rough rolling finishing temperature in the step (4) is 950-.
Preferably, the equipment used for the end cutting in the step (4) is a shearing machine, the shearing force is 150-.
Preferably, the medium rolling temperature in the step (4) is 900-950 ℃.
Preferably, the pre-finish rolling temperature of the step (4) is 930-1030 ℃.
Preferably, the pre-finish rolling billet in the step (4) is finish rolled after passing through a water cooling device, and the finish rolling temperature is 800-900 ℃.
Preferably, the cooling process of step (5) comprises: cooling to 300-500 deg.C at a rate of 8-10 deg.C/s, and air cooling to 20-30 deg.C.
The invention has the beneficial effects that: the steel rolling process of the vanadium-titanium steel bar is particularly suitable for the production of vanadium-titanium steel bar rolling, the heating process in the production process can save fuel, reduce cost, and ensure that a steel billet has good plasticity and is easy to deform; the invention adopts low-temperature rolling to ensure that a workpiece does not deform in a crystallization area to obtain smaller grain size, and the rolling adopts combined action of rough rolling, medium rolling, pre-finish rolling and finish rolling, so that the obtained steel bar has stable performance and uniform tissue, the strength and the plastic toughness of the vanadium-titanium steel bar can be obviously improved, the potential performance of the product is improved, and the economic benefit of enterprises is improved.
Detailed Description
In order that those skilled in the art will better understand the technical solutions of the present invention, the present invention will be further described in detail with reference to the following embodiments.
The key point of the steel rolling process of the vanadium-titanium steel bar is that in the process, each process parameter is controlled so as to implement controlled rolling in a critical austenite region and controlled cooling after rolling, thereby realizing deformation induced ferrite phase transformation, and finally achieving the purpose of refining ferrite-pearlite grains, namely improving the strength of the steel bar and keeping good plasticity.
The technical scheme of the invention is a steel rolling process of a vanadium-titanium steel bar, which comprises the following steps:
(1) feeding a steel billet into a furnace: conveying the continuously cast and cut steel billet into a heating furnace, wherein the continuous casting temperature is 1400-1500 ℃, and the continuous casting speed is 1.5-2.0 m/min;
(2) heating: and (2) heating the steel billet in the step (1) in a heating furnace, wherein the heating comprises a preheating section and a heating section, the preheating is slow heating, the heating temperature is 600-700 ℃, the heating time is 60-90 minutes, the heating section is rapid heating, the heating temperature is 950-1000 ℃, and the heating time is 30-60 minutes.
The purpose of heating the steel billet is to improve the plasticity of the steel and reduce the deformation resistance so as to facilitate rolling; the correct heating process can also eliminate or reduce the internal structure defects of the steel billet. The heating process of the vanadium-titanium steel bar has direct relation with various technical and economic indexes such as steel quality, rolling mill yield, energy consumption, rolling mill service life and the like. Can restrain the excessive growth of tissue crystalline grain and become coarse grain structure under this temperature, and the cohesion between the reduction grain of production reduces the problem of plasticity of steel, utilizes the heating flue gas waste heat to preheat the billet to fuel saving, reduce cost, and the billet has good plasticity this moment, easily warp.
(3) Steel billet tapping: tapping the steel billet heated in the step (2) through a tapping machine;
(4) rolling: rolling the steel billet tapped in the step (3), wherein the rolling comprises rough rolling, head cutting, intermediate rolling, pre-finish rolling, finish rolling and tail cutting;
(5) and (3) finishing: and (4) carrying out multiple-length flying shear, cooling and inspection on the billet rolled in the step (4).
Preferably, the continuous casting temperature of the step (1) is 1450 ℃.
Preferably, the drawing speed of the continuous casting of the step (1) is 1.8 m/min;
preferably, the initial rolling temperature before the rough rolling in the step (4) is 900-.
Preferably, the rough rolling finishing temperature in the step (4) is 950-. And the workpiece is not deformed in a crystallization area by adopting low-temperature rolling, so that a smaller grain size is obtained.
Preferably, the equipment used for the end cutting in the step (4) is a shearing machine, the shearing force is 150-. In the rolling process, it is necessary to perform crop and crop in order to make the rolling process smoothly.
Preferably, the medium rolling temperature in the step (4) is 900-950 ℃. The temperature is the self temperature of the rough-rolled steel billet, namely the intermediate rolling temperature is not controlled, and the normal temperature is preferred.
Preferably, the pre-finish rolling temperature of the step (4) is 930-1030 ℃. This temperature is the temperature rise range after the intermediate rolling.
Preferably, the pre-finish rolling billet in the step (4) is finish rolled after passing through a water cooling device, and the finish rolling temperature is 800-. The temperature is controlled by a water cooling device, the size of crystal grains generated at the temperature is uniform and fine, and higher comprehensive performance of the material can be obtained.
Preferably, the cooling process of step (5) comprises: cooling to 300-500 deg.C at a rate of 8-10 deg.C/s, and air cooling to 20-30 deg.C.
The foregoing is a detailed description of the invention and the following is an example of the invention.
Example 1
A steel rolling process of a vanadium-titanium steel bar comprises the following steps:
(1) feeding a steel billet into a furnace: conveying the continuously cast and cut steel billet into a heating furnace, wherein the continuous casting temperature is 1400 and the continuous casting drawing speed is 1.5 m/min;
(2) heating: heating the steel billet in the step (1) in a heating furnace, wherein the heating comprises a preheating section and a heating section, the preheating section is used for slowly heating, the heating temperature is 600 ℃, the heating time is 60 minutes, the heating section is used for rapidly heating, the heating temperature is 950 ℃, and the heating time is 30 minutes.
(3) Steel billet tapping: tapping the steel billet heated in the step (2) through a tapping machine;
(4) rolling: rolling the steel billet tapped in the step (3), wherein the rolling comprises rough rolling, head cutting, intermediate rolling, pre-finish rolling, finish rolling and tail cutting; the initial rolling temperature before rough rolling is 900 ℃, the rough rolling final rolling temperature is 950 ℃, the intermediate rolling temperature is 900 ℃, the pre-finish rolling temperature is 930 ℃, the pre-finish rolling billet is subjected to finish rolling after passing through a water cooling device, the finish rolling temperature is 800 ℃, the equipment adopted for the end cutting is a shearing machine, the shearing force is 150 tons, the equipment adopted for the end cutting is a gate shear, the shearing force is 150 tons,
(5) and (3) finishing: and (4) carrying out multiple-length flying shear, cooling and inspection on the billet rolled in the step (4), wherein the cooling process is to cool the billet to 300 ℃ at the speed of 8 ℃/s, and finally, carrying out air cooling to 20 ℃.
Example 2
A steel rolling process of a vanadium-titanium steel bar comprises the following steps:
(1) feeding a steel billet into a furnace: conveying the continuously cast and cut steel billet into a heating furnace, wherein the continuous casting temperature is 1500 ℃, and the continuous casting pulling speed is 2.0 m/min;
(2) heating: heating the steel billet in the step (1) in a heating furnace, wherein the heating comprises a preheating section and a heating section, the preheating section is used for slowly heating, the heating temperature is 700 ℃, the heating time is 90 minutes, the heating section is used for rapidly heating, the heating temperature is 1000 ℃, and the heating time is 60 minutes.
(3) Steel billet tapping: tapping the steel billet heated in the step (2) through a tapping machine;
(4) rolling: rolling the steel billet tapped in the step (3), wherein the rolling comprises rough rolling, head cutting, intermediate rolling, pre-finish rolling, finish rolling and tail cutting; the initial rolling temperature before rough rolling is 1000 ℃, the rough rolling final rolling temperature is 1000 ℃, the intermediate rolling temperature is 950 ℃, the pre-finish rolling temperature is 1030 ℃, the pre-finish rolling billet is subjected to finish rolling after passing through a water cooling device, the finish rolling temperature is 900 ℃, the equipment adopted for the end cutting is a shearing machine, the shearing force is 160 tons, the equipment adopted for the end cutting is a gate shear, the shearing force is 160 tons,
(5) and (3) finishing: and (4) carrying out multiple-length flying shear, cooling and inspection on the billet rolled in the step (4), wherein the cooling process is to cool the billet to 500 ℃ at the speed of 10 ℃/s, and finally, air cooling to 30 ℃.
Example 3
A steel rolling process of a vanadium-titanium steel bar comprises the following steps:
(1) feeding a steel billet into a furnace: conveying the continuously cast and cut steel billet into a heating furnace, wherein the continuous casting temperature is 1450 ℃, and the continuous casting speed is 1.8 m/min;
(2) heating: and (2) heating the steel billet in the heating furnace in the step (1), wherein the heating comprises a preheating section and a heating section, the preheating section is used for slowly heating, the heating temperature is 650 ℃, the heating time is 80 minutes, the heating section is used for rapidly heating, the heating temperature is 980 ℃, and the heating time is 50 minutes.
(3) Steel billet tapping: tapping the steel billet heated in the step (2) through a tapping machine;
(4) rolling: rolling the steel billet tapped in the step (3), wherein the rolling comprises rough rolling, head cutting, intermediate rolling, pre-finish rolling, finish rolling and tail cutting; the initial rolling temperature before rough rolling is 980 ℃, the rough rolling final rolling temperature is 960 ℃, the intermediate rolling temperature is 930 ℃, the pre-finish rolling temperature is 950 ℃, the pre-finish rolling billet is subjected to finish rolling after passing through a water cooling device, the finish rolling temperature is 850 ℃, the head cutting equipment is a shearing machine, the shearing force is 155 tons, the tail cutting equipment is a gate shear, the shearing force is 155 tons,
(5) and (3) finishing: and (4) carrying out multiple-length flying shear, cooling and inspection on the billet rolled in the step (4), wherein the cooling process is to cool the billet to 400 ℃ at the speed of 9 ℃/s, and finally, carrying out air cooling to 25 ℃.
The above is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the spirit and scope of the invention, and these modifications and adaptations should be considered within the scope of the invention.
Claims (10)
1. A steel rolling process of a vanadium-titanium steel bar is characterized by comprising the following steps:
(1) feeding a steel billet into a furnace: conveying the continuously cast and cut steel billet into a heating furnace, wherein the continuous casting temperature is 1400-1500 ℃, and the continuous casting speed is 1.5-2.0 m/min;
(2) heating: and (2) heating the steel billet in the step (1) in a heating furnace, wherein the heating comprises a preheating section and a heating section, the preheating is slow heating, the heating temperature is 600-700 ℃, the heating time is 60-90 minutes, the heating section is rapid heating, the heating temperature is 950-1000 ℃, and the heating time is 30-60 minutes.
(3) Steel billet tapping: tapping the steel billet heated in the step (2) through a tapping machine;
(4) rolling: rolling the steel billet tapped in the step (3), wherein the rolling comprises rough rolling, head cutting, intermediate rolling, pre-finish rolling, finish rolling and tail cutting;
(5) and (3) finishing: and (4) carrying out multiple-length flying shear, cooling and inspection on the billet rolled in the step (4).
2. The process for rolling vanadium-titanium steel bars according to claim 1, characterized in that the continuous casting temperature of step (1) is 1450 ℃.
3. The steel rolling process of vanadium-titanium steel bars according to claim 1, characterized in that the continuous casting of step (1) has a casting speed of 1.8 m/min.
4. The steel rolling process of the vanadium-titanium steel bar as claimed in claim 1, wherein the rolling start temperature before the rough rolling in the step (4) is 900-1000 ℃.
5. The steel rolling process of the vanadium-titanium steel bar as claimed in claim 1, wherein the rough rolling finish rolling temperature in the step (4) is 950-.
6. The steel rolling process of vanadium-titanium steel bars as claimed in claim 1, wherein the equipment adopted for the end cutting in step (4) is a shearing machine, the shearing force is 150-.
7. The steel rolling process of vanadium-titanium steel bars as claimed in claim 1, wherein the medium rolling temperature in step (4) is 900-950 ℃.
8. The steel rolling process of vanadium-titanium steel bars as claimed in claim 1, characterized in that the pre-finish rolling temperature of step (4) is 930-1030 ℃.
9. The steel rolling process of the vanadium-titanium steel bar as claimed in claim 1, wherein the steel billet after the pre-finish rolling in the step (4) is subjected to finish rolling after passing through a water cooling device, and the finish rolling temperature is 800-900 ℃.
10. The steel rolling process of vanadium-titanium steel bars as claimed in claim 1, wherein the cooling process of step (5) comprises: cooling to 300-500 deg.C at a rate of 8-10 deg.C/s, and air cooling to 20-30 deg.C.
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| CN202011434674.4A CN112692053B (en) | 2020-12-10 | 2020-12-10 | Steel rolling process of vanadium-titanium steel bar |
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| CN112692053B (en) | 2023-03-24 |
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