CN111530942A - Hot rolling process of high-quality carbon structural steel - Google Patents
Hot rolling process of high-quality carbon structural steel Download PDFInfo
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- CN111530942A CN111530942A CN202010412908.9A CN202010412908A CN111530942A CN 111530942 A CN111530942 A CN 111530942A CN 202010412908 A CN202010412908 A CN 202010412908A CN 111530942 A CN111530942 A CN 111530942A
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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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- 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
- B21B37/46—Roll speed or drive motor control
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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
- B21B37/56—Elongation control
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- 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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- 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
- B21B45/02—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 for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
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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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
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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
- B21B2015/0057—Coiling the rolled product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2265/00—Forming parameters
- B21B2265/10—Compression, e.g. longitudinal compression
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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 provides a hot rolling process of high-quality carbon structural steel, which adopts the procedures of preheating, heating, soaking, rolling, cooling, finishing and inspection, controls the temperature of a heating section to be 1060-1250 ℃ and the temperature of a soaking section to be 1040-1240 ℃ so as to avoid the increase of rolling force and overload of a rolling mill caused by over-low temperature of the heating section and the soaking section, and reduce the risk of equipment damage; controlling the finish rolling temperature to be 900-950 ℃, enabling the finish rolling temperature to be close to a phase transition point, accelerating the transformation rate of super-cooled austenite to pearlite and ferrite, reducing the Brinell hardness of a high-quality carbon structure steel, and improving the phenomenon that cracks are easy to generate in the subsequent cold shearing process; the method has the advantages of controlling the components of the steel billet, the cooling mode, the curling temperature and other modes, further reducing the edge crack phenomenon in the production process of the carbon structural steel, along with small control difficulty, strong operability, simple method, no need of high-cost modification of a cooling control process, low cost and suitability for the production of high-quality carbon structural steel with various specifications.
Description
Technical Field
The invention relates to the technical field of hot rolled steel, in particular to a hot rolling process of high-quality carbon structural steel.
Background
The carbon steel is an iron-carbon alloy with carbon mass fraction of 0.2-2.06% and containing a small amount of impurities such as Si, Mn, P, S and the like, and can be classified into carbon structural steel, carbon tool steel and carbon cast steel according to the application. The carbon structural steel can be divided into common carbon structural steel and high-quality carbon structural steel according to metallurgical quality. The common carbon structural steel has simple smelting method and contains harmful impurities and nonmetallic inclusions, and the high-quality carbon structural steel refers to carbon steel containing less than 0.8 percent of carbon, less sulfur, phosphorus and nonmetallic inclusions, better uniformity and surface quality and better mechanical property.
At present, in the process of preparing high-quality carbon structural steel, a steel mill can add a trace amount of alloy elements such as Ti, Nb and the like to separate out fine and dispersed carbon and nitrogen compounds, and has good effects on the aspects of grain refinement, precipitation strengthening, recrystallization control and the like, thereby not only effectively improving the strength of the high-quality carbon structural steel, but also improving the ductility and toughness and meeting the requirements of the comprehensive performance of the high-quality carbon structural steel. In order to fully play the roles of grain refinement and precipitation strengthening of alloy elements, a controlled rolling and controlled cooling process is widely adopted in steel mills at present, a cooling bed adopted by a production line is generally a stepping cooling bed, the cooling speed is required to be less than 10 ℃/s so as to ensure that the transformation from austenite to ferrite and pearlite (the structure transformation product of ferrite and pearlite at the temperature of more than 550 ℃) in high-quality carbon structural steel is completely finished in a phase transformation region at the temperature, but a steel billet is required to be rapidly cooled to the coiling temperature condition after finish rolling, the supercooled austenite cannot be transformed to the ferrite and pearlite due to the excessively high cooling speed, an upper bainite structure is generated, the hardness of the upper bainite structure is high, cracks are frequently generated during subsequent cold shearing of the steel billet, and the product performance is influenced, so that the controlled rolling and controlled cooling process can be effectively used for reducing the surface hardness of the high-quality carbon structural, The hot rolling process suitable for producing high-quality carbon structural steel of various specifications is very important.
Disclosure of Invention
The invention aims to provide a hot rolling process of high-quality carbon structural steel, which is used for reducing the surface hardness of a high-quality carbon structural steel billet, improving the problem of billet cracking in cold shearing, avoiding high-cost modification of a controlled cooling process and being suitable for producing high-quality carbon structural steel with various specifications.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a hot rolling process of high-quality carbon structural steel comprises the following steps:
(1) preheating a high-quality carbon structural steel billet, and controlling the temperature of a preheating section to be less than or equal to 800 ℃;
(2) after preheating, allowing the steel billet to enter a heating section, and controlling the temperature of the heating section to be 1060-1250 ℃;
(3) after heating, the steel billet enters a soaking section, and the temperature of the soaking section is controlled to be 1040-1240 ℃;
(4) rolling a steel billet, wherein the final rolling temperature is controlled to be 900-950 ℃ in the rolling process;
(5) cooling the rolled steel billet;
(6) and finishing and inspecting the steel billet after cooling to finally prepare the high-quality carbon structural steel.
Further, the high-quality carbon structural steel billet comprises the following chemical components in percentage by weight: c: 0.42 to 0.50%, Si: 0.20 to 0.35%, Mn: 0.10-0.15%, P: 0-0.035%, S: 0-0.035%, Al: 0.005-0.030%, Ti: 0.009-0.015%, Cr: 0.01 to 0.02%, Nb: 0.015-0.019%, and the balance of Fe and inevitable impurities.
Further, the temperature of the heating section in the step (2) is 1140-1250 ℃; the temperature of the soaking section in the step (3) is 1130-1240 ℃; and (4) controlling the finishing temperature to be 920-940 ℃.
Further, the heating section is divided into a first heating section and a second heating section; the temperature of the first heating section is 880-1100 ℃; the temperature of the heating second section is 1060-1250 ℃; the heating time of the heating process is 135-200 min.
Further, before the billet enters the rolling stage, a high-pressure water descaling procedure needs to be carried out on the surface of the billet.
Further, the rolling is performed by adopting 3 groups of rough rolling units, 2 groups of middle rolling units and 4 groups of finish rolling units, the initial rolling temperature is controlled to be 960-980 ℃, the rolling speed is 0.5-3 m/s, the total rolling reduction rate is more than or equal to 30%, and the final pass reduction rate is less than or equal to 20%; the multiple groups of rough rolling units, the middle rolling units and the finishing rolling units are arranged in a flat-crossed alternative mode.
Further, a water curtain cooling device is adopted for cooling, and the cooling speed is 30-50 ℃/s.
Further, the finishing comprises the step of curling the steel billet, and the curling temperature is controlled to be 500-650 ℃.
The invention has the beneficial effects that:
1. according to the invention, the temperature of the heating section and the temperature of the soaking section are controlled to prevent austenite grains from coarsening, so that the conditions that the rolling force is increased and the load of a rolling mill is too heavy due to too low temperature of the heating section and the temperature of the soaking section are avoided, and the risk of equipment damage is reduced; the finish rolling temperature of the rolling process is controlled to be close to the phase transition point, the phase transition is induced by thermal deformation, the phase transition temperature is increased, the incubation period is shortened, the transformation rate of super-cooled austenite to pearlite + ferrite is accelerated, the rolled steel structure is ensured to be pearlite + ferrite, the Brinell hardness of the high-quality carbon structure steel is reduced, the Brinell hardness is reduced from about 217HBW to about 172HBW, and the phenomenon that cracks are easily generated in the subsequent cold shearing process is improved.
2. The method further reduces the occurrence of edge cracking in the production process of the carbon structural steel by controlling the components of the steel billet, the cooling mode, the curling temperature and the like, has small control difficulty, strong operability, simple method, no need of high-cost transformation of a cooling control process and low cost, and is suitable for producing high-quality carbon structural steel with various specifications.
Drawings
FIG. 1 is a flow chart of a hot rolling process of the high-quality carbon structural steel.
Detailed Description
The invention will be described in further detail below with reference to the drawings, but the scope of the invention is not limited thereto.
The invention provides a hot rolling process of high-quality carbon structural steel, which comprises a heating process and a rolling process, wherein the heating process comprises a heating section and a soaking section; the Brinell hardness of the high-quality carbon structural steel is reduced by controlling the temperature of the heating section to be 1060-1250 ℃, controlling the temperature of the soaking section to be 1040-1240 ℃ and controlling the finish rolling temperature of the rolling process to be 900-950 ℃.
Example 1
The invention provides a hot rolling process of high-quality carbon structural steel, which comprises the steps of preheating, heating, soaking, rolling, cooling and finishing a steel billet, wherein the heating is divided into a first heating section and a second heating section, and the finishing comprises the step of curling the steel billet, and specifically comprises the following steps:
(1) the chemical components of the steel billet used in the preheating section are as follows by weight percent: c: 0.45%, Si: 0.20%, Mn: 0.12%, P: 0.015%, S: 0.02%, Al: 0.0025%, Ti: 0.01%, Cr: 0.01%, Nb: 0.016% and the balance of Fe and inevitable impurities.
(2) The temperature of the preheating section is 750 ℃; the temperature of the first heating section is 920 ℃; the temperature of the heating second section is 1200 ℃; the heating time of the heating process is 135 min;
(3) the method comprises the following steps that (1) a billet enters a rolling process from a heating process, wherein the initial rolling temperature of the rolling process is 960 ℃, and the final rolling temperature of the rolling process is 940 ℃; in the rolling process, 3 groups of rough rolling units, 2 groups of middle rolling units and 4 groups of finish rolling units are adopted for continuous rolling, the rolling speed is 2m/s, the total reduction rate is 30 percent, and the final reduction rate is 20 percent; the multiple groups of rough rolling units, the middle rolling units and the finishing rolling units are arranged alternately in a flat-crossed mode, all continuous non-twisting rolling is adopted, twisting in the rolling process of rolled pieces is avoided, and surface defects of finished products are effectively reduced.
(4) And immediately cooling by adopting a water curtain cooling device after finishing the finish rolling at a cooling speed of 36 ℃/s to 620 ℃ for curling, and then inspecting to finally prepare the high-quality carbon structural steel.
The Brinell hardness of the high-quality carbon structural steel obtained by the process is 190HBW, the problem that the billet is cracked during cold shearing is solved, high-cost transformation of a controlled cooling process is not needed, and the process is suitable for producing high-quality carbon structural steels of various specifications.
Example 2
The invention provides a hot rolling process of high-quality carbon structural steel, which comprises the steps of preheating, heating, soaking, rolling, cooling and finishing a steel billet, wherein the heating is divided into a first heating section and a second heating section, and the finishing comprises the step of curling the steel billet, and specifically comprises the following steps:
(1) the chemical components of the steel billet used in the heating section are as follows by weight percent: c: 0.45%, Si: 0.20%, Mn: 0.12%, P: 0.015%, S: 0.02%, Al: 0.0025%, Ti: 0.01%, Cr: 0.01%, Nb: 0.016% and the balance of Fe and inevitable impurities.
(2) The temperature of the preheating section is 800 ℃; the temperature of the first heating section is 1040 ℃; the temperature of the heating second section is 1160 ℃; the heating time of the heating process is 180 min;
(3) the method comprises the following steps that (1) a billet enters a rolling process from a heating process, wherein the initial rolling temperature of the rolling process is 960 ℃, and the final rolling temperature is 900 ℃; in the rolling process, 3 groups of rough rolling units, 2 groups of middle rolling units and 4 groups of finish rolling units are adopted for continuous rolling, the rolling speed is 3m/s, the total reduction rate is 30 percent, and the final reduction rate is 20 percent; the multiple groups of rough rolling units, the middle rolling units and the finishing rolling units are arranged alternately in a flat-crossed mode, all continuous non-twisting rolling is adopted, twisting in the rolling process of rolled pieces is avoided, and surface defects of finished products are effectively reduced.
(4) And immediately cooling by adopting a water curtain cooling device at a cooling speed of 48 ℃/s to 620 ℃ after finishing rolling, curling, and inspecting to finally obtain the high-quality carbon structural steel.
The Brinell hardness of the high-quality carbon structural steel obtained by the process is 182HBW, the problem of billet cracking during cold shearing is solved, high-cost transformation of a controlled cooling process is not needed, and the process is suitable for production of high-quality carbon structural steels of various specifications.
Example 3
The invention provides a hot rolling process of high-quality carbon structural steel, which comprises the steps of preheating, heating, soaking, rolling, cooling and finishing a steel billet, wherein the heating is divided into a first heating section and a second heating section, and the finishing comprises the step of curling the steel billet, and specifically comprises the following steps:
(1) the chemical components of the steel billet used in the heating section are as follows by weight percent: c: 0.45%, Si: 0.20%, Mn: 0.12%, P: 0.015%, S: 0.02%, Al: 0.0025%, Ti: 0.01%, Cr: 0.01%, Nb: 0.016% and the balance of Fe and inevitable impurities.
(2) The temperature of the preheating section is 800 ℃; the temperature of the first heating section is 1040 ℃; the temperature of the heating second section is 1160 ℃; the heating time of the heating process is 180 min;
(3) the method comprises the following steps that (1) a billet enters a rolling process from a heating process, wherein the initial rolling temperature of the rolling process is 960 ℃, and the final rolling temperature is 900 ℃; in the rolling process, 3 groups of rough rolling units, 2 groups of middle rolling units and 4 groups of finish rolling units are adopted for continuous rolling, the rolling speed is 2m/s, the total reduction rate is 40 percent, and the final reduction rate is 20 percent; the multiple groups of rough rolling units, the middle rolling units and the finishing rolling units are arranged alternately in a flat-crossed mode, all continuous non-twisting rolling is adopted, twisting in the rolling process of rolled pieces is avoided, and surface defects of finished products are effectively reduced.
(4) And immediately cooling by adopting a water curtain cooling device at a cooling speed of 50 ℃/s to 650 ℃ after finishing rolling, curling, and inspecting to finally obtain the high-quality carbon structural steel.
The Brinell hardness of the high-quality carbon structural steel obtained by the process is 168HBW, the problem that the steel billet is cracked during cold shearing is solved, high-cost transformation of a controlled cooling process is not needed, and the process is suitable for producing high-quality carbon structural steels of various specifications.
Comparative example 1
This comparative example provides a hot rolling process of a high quality carbon structural steel, which is the same as example 1 except that the heating zone temperature and the soaking zone temperature of step (2) are 1240 ℃.
The Brinell hardness of the high-quality carbon structural steel obtained by the method is 216 HBW.
Comparative example 2
This comparative example provides a hot rolling process of a high quality carbon structural steel, which is the same as example 2 except that the finish rolling temperature in step (3) is 980 ℃.
The Brinell hardness of the high-quality carbon structural steel obtained by the method is 210 HBW.
It can be seen from examples 1-3 and comparative examples 1-2 that the control of the heating section, the soaking section and the finish rolling temperature is very important in the method for controlling the Brinell hardness of the high-quality carbon structural steel provided by the invention, and the Brinell hardness of the high-quality carbon structural steel can be effectively reduced only by ensuring that the heating section, the soaking section and the finish rolling temperature are within the range given by the claims of the invention.
The hot rolling process of the high-quality carbon structural steel provided by the invention can effectively reduce the Brinell hardness of the high-quality carbon structural steel to 168HBW, which is obviously lower than the Brinell hardness 216HBW and 210HBW of the high-quality carbon structural steel processed by adopting the prior art in comparative examples 1 and 2.
The present invention is not limited to the above-described embodiments, and any obvious improvements, substitutions or modifications can be made by those skilled in the art without departing from the spirit of the present invention.
Claims (8)
1. The hot rolling process of the high-quality carbon structural steel is characterized by comprising the following steps of:
(1) preheating a high-quality carbon structural steel billet, and controlling the temperature of a preheating section to be less than or equal to 800 ℃;
(2) after preheating, allowing the steel billet to enter a heating section, and controlling the temperature of the heating section to be 1060-1250 ℃;
(3) after heating, the steel billet enters a soaking section, and the temperature of the soaking section is controlled to be 1040-1240 ℃;
(4) rolling a steel billet, wherein the final rolling temperature is controlled to be 900-950 ℃ in the rolling process;
(5) cooling the rolled steel billet;
(6) and finishing and inspecting the steel billet after cooling to finally prepare the high-quality carbon structural steel.
2. The hot rolling process according to claim 1, wherein the high-quality carbon structural steel billet comprises the following chemical components in percentage by weight: c: 0.42 to 0.50%, Si: 0.20 to 0.35%, Mn: 0.10-0.15%, P: 0-0.035%, S: 0-0.035%, Al: 0.005-0.030%, Ti: 0.009-0.015%, Cr: 0.01 to 0.02%, Nb: 0.015-0.019%, and the balance of Fe and inevitable impurities.
3. The hot rolling process according to claim 1, wherein the temperature of the heating section in the step (2) is 1140-1250 ℃; the temperature of the soaking section in the step (3) is 1130-1240 ℃; and (4) controlling the finishing temperature to be 920-940 ℃.
4. The hot rolling process as claimed in claim 1, wherein the heating section is divided into a heating section and a heating section; the temperature of the first heating section is 880-1100 ℃; the temperature of the heating second section is 1060-1250 ℃; the heating time of the heating process is 135-200 min.
5. The hot rolling process of claim 1, wherein the high pressure water descaling is applied to the surface of the slab prior to the slab entering the rolling stage.
6. The hot rolling process according to claim 1, wherein 3 groups of rough rolling mill sets, 2 groups of middle rolling mill sets and 4 groups of finish rolling mill sets are adopted for continuous rolling, the initial rolling temperature is controlled to be 960-980 ℃, the rolling speed is 0.5-3 m/s, the total rolling reduction rate is more than or equal to 30%, and the final rolling reduction rate is less than or equal to 20%; the multiple groups of rough rolling units, the middle rolling units and the finishing rolling units are alternately arranged in a flat-crossed manner.
7. The hot rolling process according to claim 1, wherein the cooling is performed by a water curtain cooling device at a cooling speed of 30-50 ℃/s.
8. The hot rolling process according to claim 1, wherein the finishing comprises coiling the steel slab at a controlled coiling temperature of 500-650 ℃.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112234439A (en) * | 2020-09-02 | 2021-01-15 | 国网山东省电力公司宁阳县供电公司 | Portable electric energy meter fixed bolster |
| CN112792127A (en) * | 2020-12-18 | 2021-05-14 | 江苏永钢集团有限公司 | Production process of CB890QL hot-rolled round steel for crawler crane boom |
| CN113414243A (en) * | 2021-06-24 | 2021-09-21 | 江苏永钢集团有限公司 | Method for improving bending of small-size gear steel round steel |
| CN115351094A (en) * | 2022-06-28 | 2022-11-18 | 武安市裕华钢铁有限公司 | Production method of carbon structural steel for pipe making with low welding crack sensitivity |
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| CN112234439A (en) * | 2020-09-02 | 2021-01-15 | 国网山东省电力公司宁阳县供电公司 | Portable electric energy meter fixed bolster |
| CN112792127A (en) * | 2020-12-18 | 2021-05-14 | 江苏永钢集团有限公司 | Production process of CB890QL hot-rolled round steel for crawler crane boom |
| CN112792127B (en) * | 2020-12-18 | 2022-07-05 | 江苏永钢集团有限公司 | Production process of CB890QL hot-rolled round steel for crawler crane boom |
| CN113414243A (en) * | 2021-06-24 | 2021-09-21 | 江苏永钢集团有限公司 | Method for improving bending of small-size gear steel round steel |
| CN115351094A (en) * | 2022-06-28 | 2022-11-18 | 武安市裕华钢铁有限公司 | Production method of carbon structural steel for pipe making with low welding crack sensitivity |
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