CN113333463A - Q195 cold forging steel production process - Google Patents
Q195 cold forging steel production process Download PDFInfo
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- CN113333463A CN113333463A CN202110585472.8A CN202110585472A CN113333463A CN 113333463 A CN113333463 A CN 113333463A CN 202110585472 A CN202110585472 A CN 202110585472A CN 113333463 A CN113333463 A CN 113333463A
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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
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/02—Shape or construction of rolls
- B21B27/024—Rolls for bars, rods, rounds, tubes, wire or the like
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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
- 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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- 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
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
- B21B45/0224—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for wire, rods, rounds, bars
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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
- B21B2015/0021—Cutting or shearing the product in the rolling direction
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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
Abstract
The invention discloses a Q195 cold forging steel production process, which comprises the following steps: (1) heating; (2) rough rolling; (3) primary medium rolling; (4) secondary medium rolling; (5) pre-finish rolling; (6) primary water penetration cooling; (7) finish rolling; (8) secondary water cooling; (9) spinning and forming; (10) air cooling, and (11) sending the mixture into a P & F line for cooling. In order to make up for the defects of the prior art, the invention realizes the Q195 cold heading steel high-quality product with refined grains, uniform structure, high elongation and improved cold heading performance brought by rolling reinforcement of the controlled rolling and controlled cooling technology, realizes stable production and stable quality, and solves the problems in the prior art.
Description
Technical Field
The invention relates to the field of cold forging steel production processes, in particular to a Q195 cold forging steel production process.
Background
In the field of cold heading steel of hot rolled steel wire rod hot rolled disc strips in the steel industry, Q195 cold heading steel is produced by adopting high-temperature rolling and a conventional high-temperature rolling process, but crystal grains are expanded due to rolling temperature rise, the elongation coefficient of a finished product is lower, the wire breakage rate in the processing process is higher, and the Q195 cold heading steel is lower in strength, limited in rolling speed and lower in yield. The difficulty of cold heading steel production of rolled steel wires mainly solves the problems of easy cracking and low elongation of cold heading.
Disclosure of Invention
The invention aims to provide a Q195 cold heading steel production process, which aims to solve the problems of easy cracking and low elongation rate of cold heading in the cold heading steel rolling production process in the prior art.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a Q195 cold forging steel production process comprises the following steps:
(1) selecting a square billet with the height multiplied by the width multiplied by the length multiplied by 150mm multiplied by 12000mm as a blank, and heating the blank to 1090-1130 ℃ by a heating furnace.
(2) And (2) descaling the steel billet heated in the step (1) by high-pressure water, and then carrying out rough rolling to obtain a first round rolled piece with the diameter of 70 mm.
In the step (2), the rough rolling is carried out by adopting a rough rolling unit consisting of 6 rough rolling mills, and the hole patterns of the 6 rough rolling mills are box-type-box-round-elliptical-round in sequence. In the roughing mill group, the height and width of the material of the 1 st roughing mill are (109 +/-1 mm) × (164 +/-1 mm); the height and width of the 2 nd rough rolling mill are (118 +/-1 mm) × (118 +/-1 mm); the height and width of the 3 rd rough rolling mill are (82 +/-1 mm) × (134 +/-1 mm); the height and width of the material of the 4 th rough rolling mill are (95 +/-1 mm) × (95 +/-1 mm); the height and width of the material of the 5 th rough rolling mill are (59 +/-1 mm) × (120 +/-1 mm); the material height of the 6 th rough rolling mill is (70 +/-0.5 mm) × (70 +/-0.5 mm).
(3) And (3) shearing the head and the tail of the first round rolled piece obtained in the step (2) by a first flying shear, and then carrying out medium rolling to obtain a second round rolled piece with the material height multiplied by the width multiplied by (37 +/-0.5 mm) × (37 +/-0.5 mm).
In the step (3), the middle rolling is carried out by a middle rolling unit consisting of 4 middle rolling mills, and the hole patterns of the 4 middle rolling mills are elliptical, circular, elliptical and circular in sequence. In the middle rolling mill group, the height and the width of the material of the middle rolling mill of the 1 st frame are (43 +/-1 mm) × (96 +/-1 mm); the height and width of the rolling mill material in the 2 nd frame are (54 +/-1 mm) × (54 +/-1 mm); the height and width of the rolling mill material in the 3 rd frame are (31 +/-1 mm) × (74 +/-1 mm); the height of the mill material in the 4 th stand was (37. + -. 0.5 mm). times. (37. + -. 0.5 mm).
(4) And (4) shearing the head and the tail of the second round rolled piece obtained in the step (3) by a second flying shear, and then carrying out medium rolling again to obtain a third round rolled piece with the material height multiplied by the width multiplied by (31 +/-0.5 mm).
In the step (4), the middle rolling is carried out by a middle rolling unit consisting of 2 middle rolling mills, and the hole patterns of the 2 middle rolling mills are elliptical-circular in sequence. In the middle rolling mill set, the height multiplied by the width of the middle rolling mill material of the 1 st frame is (24 +/-0.5 mm) × (44 +/-0.5 mm); the height of the mill material in the 2 nd stand is (31 + -0.5 mm) × (31 + -0.5 mm).
(5) And (3) performing pre-finish rolling on the third round rolled piece obtained in the step (4), wherein the rolling speed of the pre-finish rolling is controlled to be 10-12 m/s, and the fourth round rolled piece with the material height multiplied by the width multiplied by (22 +/-0.5 mm) is obtained through the pre-finish rolling.
In the step (5), the pre-finish rolling is performed by a pre-finish rolling unit consisting of 2 pre-finish rolling mills, and the hole patterns of the 2 pre-finish rolling mills are elliptical-circular in sequence. In the pre-finishing mill group, the height multiplied by the width of the material of the 1 st pre-finishing mill is (18 +/-0.5 mm) × (35 +/-0.5 mm); the 2 nd pre-finish rolling mill material had a height X width of (22. + -. 0.5 mm). times. (22. + -. 0.5 mm).
(6) And (5) cooling the fourth round rolled piece obtained in the step (5) through water to cool the fourth round rolled piece to the temperature of 900-.
In the step (6), the water penetration cooling is carried out by adopting two sections of pre-water cooling devices to control rolling of the pre-water penetration devices. Wherein the water pressure of the first-stage pre-water cooling device is 0.60-0.80MPa, and the water flow is 60-80m3H; the water pressure of the two-stage pre-water cooling device is 0.60-0.80MPa, and the water flow is 40-60m3/h。
(7) And (4) cutting the head and the tail of the fourth round rolled piece cooled in the step (6) by a third flying shear, and then performing finish rolling to obtain a hot-rolled disc strip with the diameter of 10 mm.
In the step (7), the finish rolling is performed by a finishing mill group consisting of 8 finish rolling mills, and the pass of the 8 finish rolling mills is elliptical, circular, elliptical, circular. In the finishing mill group, the height and width of the 1 st finishing mill material are (16 +/-0.3 mm) × (27 +/-0.3 mm); the height and width of the 2 nd finish rolling mill material are (20 +/-0.3 mm) × (20 +/-0.3 mm); the height and width of the 3 rd finish rolling mill material are (13 +/-0.3 mm) × (23 +/-0.3 mm); the height and width of the 4 th finish rolling mill material are (20 +/-0.3 mm) × (20 +/-0.3 mm); the height and width of the 5 th finish rolling mill material are (10 +/-0.3 mm) × (19.5 +/-0.3 mm); the height and width of the material of the 6 th finish rolling mill are (12.5 +/-0.3 mm) × (12.5 +/-0.3 mm); the height and width of the material of the 7 th finish rolling mill are (7.5 +/-0.3 mm) × (16.5 +/-0.3 mm); the height X width of the 8 th finish rolling mill material was (10.1. + -. 0.1mm) × (10.1. + -. 0.1 mm).
(8) And (3) cooling the hot-rolled disc strip obtained in the step (7) by water cooling to ensure that the temperature of the hot-rolled disc strip is cooled to 940-980 ℃.
In the step (8), the water-passing cooling is carried out by adopting a controlled cooling water-passing device after being rolled by a four-section water-cooling device. Wherein the water pressure of the first section of water cooling device is 0.60-0.80MPa, and the water flow is 20-40m3H; the water pressure of the two-stage water cooling device is 0.60-0.80MPa, and the water flow is 20-40m3H; the water pressure of the three-section water cooling device is 0.60-0.80MPa, and the water flow is 10-30m3H; four-section water cooling deviceWater pressure of 0.60-0.80MPa and water flow of 0-10m3/h。
(9) And (4) spinning and forming the hot-rolled disc strip cooled in the step (8) into a wire rod.
In this step (9), the laying head is used for laying formation. The lead coefficient of the laying head is 1.010-1.025, the swing positive amplitude coefficient is 0.02, and the swing time is 8 seconds.
(10) And (4) cooling the wire rod obtained in the step (9) by air, cooling the wire rod to below 700 ℃, and then preserving heat for 50-70 seconds.
And (10) performing air cooling by adopting an air cooling roller way, performing air cooling on the steel bar sent into the air cooling roller way by cooling through a stelmor fan, and performing heat preservation in a heat preservation cover mode of the air cooling roller way. The number of the stelmor fans is 12, and the number 1 fan is opened for 30-40% of air volume; the 2# fan is started to have 30-40% of air volume; the No. 11 fan is started to have 30-40% of air volume; the No. 12 fan is started to have 30-40% of air volume; the air cooling roller way has 11 sections, and the roller way speed of 1 section is 0.45-0.48 m/s; the speed of the 2-section roller way is 0.48-0.51 m/s; the speed of the 3-section roller way is 0.51-0.54 m/s; the speed of the 4-section roller way is 0.54-0.57 m/s; the speed of the 5-section roller way is 0.57-0.60 m/s; the speed of the 6-section roller way is 0.60-0.63 m/s; the speed of the 7-section roller way is 0.63-0.66 m/s; the speed of the 8-section roller way is 0.66-0.70 m/s; the speed of the 9-section roller way is 0.70-0.75 m/s; the speed of the 10-section roller way is 0.70-0.75 m/s; the speed of the 11-section roller way is 0.80-0.85 m/s; the total number of the heat preservation covers is 15, and 5# -10# heat preservation covers are closed.
(11) And (3) collecting the wire rods cooled and insulated in the step (10) by a lower collecting roll, putting the wire rods on a C-shaped hook by a coil conveying trolley, and conveying the wire rods to a P & F wire for natural cooling for 30-40 minutes. And cooling to obtain the finished product Q195 cold forging steel.
According to the invention, the rollers of the roughing mill group and the rollers of the intermediate mill group adopt common cast iron rollers, and the accurate control of material types is realized through the optimized configuration of the materials of the rollers and the roller rings, so that the quality of Q195 cold heading steel finished products is further improved.
In the invention, water cooling is carried out between the pre-finish rolling and the finish rolling, so that the cold heading steel is rolled at the steel temperature of 900 plus 940 ℃; after finish rolling, water cooling is carried out, and the temperature of the steel is reduced to 940-980 ℃ after rolling; and the hot-rolled disc strip is cooled to below 700 ℃ in an air cooling mode for heat preservation, so that the aims of grain refinement, uniform structure, high elongation and cold heading performance improvement of the cold heading steel are fulfilled.
In the invention, two middle rolling mills move backwards to reduce the middle rolling speed and create technical conditions for the uniformity of the pre-water penetration. By optimizing a series of process methods such as material type control, water penetration control, air cooling control, heat preservation control and the like, the Q195 cold heading steel high-quality product with refined grains, uniform structure, high elongation and improved cold heading performance, which are brought by rolling strengthening of the controlled rolling and controlled cooling technology, is realized, the production stability and the quality stability are realized, and the problems in the prior art are solved.
Aiming at the technical requirements of Q195 cold heading steel, the invention combines various factors influencing the performance and rolling speed of the cold heading steel and the actual production, and adopts the medium-rolling large-size and controlled-rolling controlled-cooling process technology to ensure that the cold heading steel obtains the required structure and performance, ensure the strength and plasticity of the cold heading steel, simultaneously improve the finish rolling speed and improve the productivity.
Compared with the prior art, the invention has the advantages that:
by adopting the scheme, the invention has reasonable structural design, realizes grain refinement, uniform structure, high elongation and improved cold heading performance, and also realizes great economic and social benefits brought by greatly improving production efficiency and greatly reducing rolling energy consumption.
Drawings
FIG. 1 is a system flow diagram of the production process of the present invention.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
As shown in fig. 1, the system involved in the production process of the present invention comprises, arranged in a straight line in sequence: the device comprises a heating furnace 1, a high-pressure water descaling device 2, a roughing mill group 3, a first flying shear machine 4, a first intermediate mill group 5, a second flying shear machine 6, a second intermediate mill group 7, a pre-finishing mill group 8, a pre-water cooling device 9, a third flying shear machine 10, a finishing mill group 11, a water cooling device 12, a wire laying machine 13, an air cooling roller way 14 and a P & F line 18 (a stacking type suspension conveyor), wherein the air cooling roller way 14 is provided with a fan 15 and a heat preservation cover 16, and products flowing out of the air cooling roller way 14 are transported to the P & F line 18 through a winding core frame 17. Wherein:
the heating furnace 1 is used for heating the blank in the step (1).
The high-pressure water descaling device 2 is used for descaling in the step (2); and the roughing mill group 3 is used for roughing in the step (2).
The first flying shear 4 is used for shearing the head and the tail in the step (3), and the first intermediate mill group 5 is used for the first intermediate rolling in the step (3).
And a second flying shear 6 is used for shearing the head and the tail in the step (4), and a second intermediate mill unit 7 is used for the second intermediate rolling in the step (4).
And the pre-finishing mill group 8 is used for pre-finishing in the step (5).
The pre-water cooling device 9 is used for the through-water cooling of the step (6).
The third flying shear 10 is used for shearing the head and the tail in the step (7), and the finishing mill group 11 is used for finishing in the step (7).
The water cooling device 12 is used for the through water cooling of the step (8).
The laying head 13 is used for laying and forming in the step (9).
And (3) using the air-cooled roller way 14 and the fan 15 and the heat-insulating cover 16 which are configured on the air-cooled roller way for air cooling and heat insulation in the step (10).
The P & F wire 18 is used for natural cooling in step (11), and the winding core holder 17 is used for transporting the wire rod to the P & F wire 18.
Example 1: the special production process method of phi 10mmQ195 cold heading steel comprises the following steps:
(1) selecting a square billet with the height multiplied by the width multiplied by the length multiplied by 150mm multiplied by 12000mm as a blank, and heating the blank to 1090-1130 ℃ by a heating furnace;
(2) descaling the steel billet heated in the step (1) by high-pressure water, and then feeding the steel billet into a six-frame rolling mill of a roughing mill set for rolling, wherein the six-frame roughing mill adopts a box-round-oval-round hole type system and rolls the steel billet into a round rolled piece with the diameter of 70 mm;
(3) after the head and the tail of the round rolled piece rolled in the step (2) are cut by a first flying shear, the round rolled piece is sent into a four-frame rolling mill of a middle rolling mill set for rolling, and a hole pattern system of the four-frame middle rolling mill is an oval-round-oval-round hole pattern and is rolled into a round rolled piece with the height multiplied by the width of 37 +/-0.5 mm multiplied by 37 +/-0.5 mm;
(4) after the round rolled piece rolled in the step (3) is subjected to second flying shear head and tail cutting, the round rolled piece is sent into two rolling mills of a middle rolling mill set for rolling, the hole pattern systems of the two middle rolling mills are oval-round hole patterns, and the round rolled piece with the height multiplied by the width of 31 +/-0.5 mm multiplied by 31 +/-0.5 mm is rolled;
(5) sending the round rolled piece rolled in the step (4) into two rolling mills of a pre-finishing rolling mill set for rolling, wherein the hole pattern systems of the two pre-finishing rolling mill sets are oval-round-oval-round hole patterns, the rolling speed is 12m/s, and the round rolled piece with the height multiplied by the width of 22 +/-0.5 mm multiplied by 22 +/-0.5 mm is rolled;
(6) sending the round rolled piece rolled in the step (5) into a pre-water cooling device for water cooling, and cooling the temperature of the rolled piece to 900-;
(7) and (4) cutting the head and the tail of the rolled piece subjected to water cooling by the pre-water cooling device in the step (6) by a third flying shear, and then feeding the rolled piece into eight rolling mills of the finishing mill group, wherein the hole pattern system of the eight finishing mill groups is a hot rolling disc strip with the diameter of 10mm rolled by an ellipse-circle-ellipse-circle system, and the rolling speed reaches 65 m/s.
(8) Sending the hot rolling disc strip rolled in the step (7) into a water cooling device to cool the hot rolling disc strip to 940-;
(9) feeding the hot-rolled disc strip cooled in the step (8) into a wire laying machine for laying wire and forming a ring;
(10) conveying the step (9) to an air cooling roller way for transportation, cooling by a No. 1 fan, and insulating by a No. 5-15 insulating cover;
(11) conveying the hot-rolled disc strip cooled in the step (10) into a winding core frame for transportation;
(12) and (3) sending the step (11) to a P & F line for cooling.
Example 2: the special production process method of phi 12mmQ195 cold heading steel comprises the following steps:
(1) selecting a square billet with the height multiplied by the width multiplied by the length multiplied by 150mm multiplied by 12000mm as a blank, and heating the blank to 1090-1130 ℃ by a heating furnace;
(2) descaling the steel billet heated in the step (1) by high-pressure water, and then feeding the steel billet into a six-frame rolling mill of a roughing mill set for rolling, wherein the six-frame roughing mill adopts a box-round-oval-round hole type system and rolls the steel billet into a round rolled piece with the diameter of 70 mm;
(3) after the head and the tail of the round rolled piece rolled in the step (2) are cut by a first flying shear, the round rolled piece is sent into a four-frame rolling mill of a middle rolling mill set for rolling, and a hole pattern system of the four-frame middle rolling mill is an oval-round-oval-round hole pattern and is rolled into a round rolled piece with the height multiplied by the width of 37 +/-0.5 mm multiplied by 37 +/-0.5 mm;
(4) after the round rolled piece rolled in the step (3) is subjected to second flying shear head and tail cutting, the round rolled piece is sent into two rolling mills of a middle rolling mill set for rolling, the hole pattern systems of the two middle rolling mills are oval-round hole patterns, and the round rolled piece with the height multiplied by the width of 31 +/-0.5 mm multiplied by 31 +/-0.5 mm is rolled;
(5) sending the round rolled piece rolled in the step (4) into two rolling mills of a pre-finishing rolling mill set for rolling, wherein the hole pattern systems of the two pre-finishing rolling mill sets are oval-round-oval-round hole patterns, the rolling speed is 10m/s, and the round rolled piece with the height multiplied by the width of 22 +/-0.5 mm multiplied by 22 +/-0.5 mm is rolled;
(6) sending the round rolled piece rolled in the step (5) into a pre-water cooling device for water cooling, and cooling the temperature of the rolled piece to 900-;
(7) after the water cooling device in the step (6) cools the rolled piece through water, the rolled piece enters a six-frame rolling mill of a finishing mill set after the head and the tail of the rolled piece are cut by a third flying shear, the hole pattern system of the six-frame finishing mill set is a hot rolling disc strip with the diameter of 12mm rolled by an ellipse-circle-ellipse-circle system, and the rolling speed reaches 46 m/s;
(8) sending the hot rolling disc strip rolled in the step (7) into a water cooling device to cool the hot rolling disc strip to 940-;
(9) feeding the hot-rolled disc strip cooled in the step (8) into a wire laying machine for laying wire and forming a ring;
(10) conveying the step (9) to an air cooling roller way for transportation, cooling by 1#, 2# and 11# fans, and insulating by a 5# -10# heat-insulating cover;
(11) conveying the hot-rolled disc strip cooled in the step (10) into a winding core frame for transportation;
(12) and (3) sending the step (11) to a P & F line for cooling.
In the invention, a pre-water cooling device 9 is arranged between a pre-finishing mill unit 8 and a finishing mill unit 11 to realize the rolling of cold heading steel at the temperature of 940 ℃ plus 900, a water cooling device is arranged behind the finishing mill unit to reduce the temperature of the steel to 940 plus 980 ℃ after the rolling, a fan is adopted for cooling in air-cooled roller way transportation, a hot rolling disc strip is cooled to below 700 ℃, and a heat-insulating cover is covered for heat insulation, so that the crystal grain is refined, the structure is uniform, the elongation is high, the cold heading performance is improved, and the stable production and the stable quality are realized by matching with the head with irregular shearing deformation and large temperature drop of a third flying shear 10.
The rollers of the roughing mill group and the rollers of the middle mill group adopt common cast iron rollers, the rollers of the pre-finishing mill group and the finishing mill group adopt tungsten carbide roller rings, and the accurate control of material types is realized through the optimized configuration of the materials of the rollers and the roller rings, so that the quality of Q195 cold heading steel finished products is further improved, and the problem of easy cracking of cold heading is solved.
The embodiments of the present invention are described only for the preferred embodiments of the present invention, and not for the limitation of the concept and scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the design concept of the present invention shall fall into the protection scope of the present invention, and the technical content of the present invention which is claimed is fully set forth in the claims.
Claims (10)
1. The production process of Q195 cold forging steel is characterized by comprising the following steps:
(1) selecting a square billet as a billet, and heating the billet to 1090-1130 ℃;
(2) carrying out rough rolling on the billet heated in the step (1) to obtain a first round rolled piece;
(3) cutting the head and the tail of the first round rolled piece obtained in the step (2), and then carrying out medium rolling to obtain a second round rolled piece;
(4) cutting the head and the tail of the second round rolled piece obtained in the step (3), and then performing medium rolling again to obtain a third round rolled piece;
(5) pre-finish rolling the third round rolled piece obtained in the step (4), wherein the rolling speed of the pre-finish rolling is controlled to be 10-12 m/s, and a fourth round rolled piece is obtained through the pre-finish rolling;
(6) cooling the fourth round rolled piece obtained in the step (5) through water to cool the fourth round rolled piece to the temperature of 900-;
(7) cutting the head and the tail of the fourth round rolled piece cooled in the step (6), and then performing finish rolling to obtain a hot-rolled disc strip;
(8) cooling the hot-rolled disc strip obtained in the step (7) through water to cool the temperature of the hot-rolled disc strip to 940-980 ℃;
(9) spinning and forming the hot-rolled disc strip cooled in the step (8) into a wire rod;
(10) cooling the wire rod obtained in the step (9) by air, cooling the wire rod to below 700 ℃, and then preserving heat for 50-70 seconds;
(11) and (3) collecting the wire rods cooled and insulated in the step (10) by a lower collecting roll, putting the wire rods on a C-shaped hook by a coil conveying trolley, conveying the wire rods to a P & F wire for natural cooling for 30-40 minutes, and cooling to obtain a finished product.
2. The process for producing Q195 cold forging steel according to claim 1, wherein in the step (2), the rough rolling is performed by a rough rolling mill group consisting of 6 rough rolling mills, and the pass of the 6 rough rolling mills is sequentially box-round-oval-round.
3. The process for producing Q195 cold forging steel according to claim 1, wherein in the step (3), the intermediate rolling is performed by using an intermediate rolling mill group consisting of 4 intermediate rolling mills, and the hole patterns of the 4 intermediate rolling mills are elliptical-circular-elliptical-circular in sequence.
4. The process for producing Q195 cold forging steel according to claim 1, wherein in the step (4), the intermediate rolling is performed by using an intermediate rolling mill group consisting of 2 intermediate rolling mills, and the hole patterns of the 2 intermediate rolling mills are elliptical-circular in sequence.
5. The process for producing Q195 cold forging steel according to claim 1, wherein in the step (5), the pre-finish rolling is performed by a pre-finishing mill group consisting of 2 pre-finish rolling mills, and the hole patterns of the 2 pre-finish rolling mills are elliptical-circular in sequence.
6. The process for producing Q195 cold forging steel as claimed in claim 1, wherein in step (6), the through water cooling is carried out by using two sections of pre-water cooling devices, wherein the water pressure of one section of pre-water cooling device is 0.60-0.80MPa, and the water flow is 60-80m3H; the water pressure of the two-stage pre-water cooling device is 0.60-0.80MPa, and the water flow is 40-60m3/h。
7. The process for producing Q195 cold forging steel according to claim 1, wherein in the step (7), the finish rolling is performed by a finish rolling unit consisting of 8 finish rolling mills, and the hole patterns of the 8 finish rolling mills are elliptical, circular, elliptical, circular.
8. The production process of Q195 cold heading steel as claimed in claim 1, wherein in step (8), water passing cooling is performed by four water cooling devices, wherein the water pressure of the water cooling device at one stage is 0.60-0.80MPa, and the water flow is 20-40m 3/h; the water pressure of the two-stage water cooling device is 0.60-0.80MPa, and the water flow is 20-40m3H; the water pressure of the three-section water cooling device is 0.60-0.80MPa, and the water flow is 10-30m3H; the water pressure of the four-section water cooling device is 0.60-0.80MPa, and the water flow is 0-10m3/h。
9. The process for producing Q195 cold forging steel according to claim 1, wherein in the step (9), the laying head is used for laying head forming, the lead coefficient of the laying head is 1.010-1.025, the swing positive amplitude coefficient is 0.02, and the swing time is 8 seconds.
10. The production process of Q195 cold heading steel as claimed in claim 1, wherein in step (10), air cooling is performed by using an air cooling roller table.
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