CN113600611A - Method for improving hot rolling flatness of bar and controlling bending - Google Patents
Method for improving hot rolling flatness of bar and controlling bending Download PDFInfo
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- CN113600611A CN113600611A CN202110914756.7A CN202110914756A CN113600611A CN 113600611 A CN113600611 A CN 113600611A CN 202110914756 A CN202110914756 A CN 202110914756A CN 113600611 A CN113600611 A CN 113600611A
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- 238000005452 bending Methods 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000005098 hot rolling Methods 0.000 title claims abstract description 24
- 238000005096 rolling process Methods 0.000 claims abstract description 118
- 238000001816 cooling Methods 0.000 claims abstract description 61
- 238000010438 heat treatment Methods 0.000 claims abstract description 39
- 238000009749 continuous casting Methods 0.000 claims description 47
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 238000010583 slow cooling Methods 0.000 claims description 15
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 10
- 238000002791 soaking Methods 0.000 claims description 10
- 238000010008 shearing Methods 0.000 claims description 8
- 238000004806 packaging method and process Methods 0.000 claims description 6
- 239000011295 pitch Substances 0.000 claims description 5
- 238000004321 preservation Methods 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 abstract description 22
- 239000010959 steel Substances 0.000 abstract description 22
- 239000002184 metal Substances 0.000 abstract description 5
- 229910052751 metal Inorganic materials 0.000 abstract description 5
- 239000002994 raw material Substances 0.000 abstract description 5
- 238000012545 processing Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000005303 weighing Methods 0.000 description 3
- 230000002195 synergetic effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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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
- 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
- B21B45/04—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 de-scaling, e.g. by brushing
- B21B45/08—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 de-scaling, e.g. by brushing hydraulically
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Abstract
The invention belongs to the technical field of metal pressure processing, and particularly relates to a method for improving hot rolling straightness of a bar and controlling bending. The method comprises a blank heating system, rolling process temperature control, cooling bed cooling control, bar sawing and bar finishing. With the saw cutting of blank heating, rolling control by temperature change, cold bed cooling control by temperature change and rod and finishing overall design for the bar of easily bending process raw materials heating, rolling temperature control and cold bed cooling control after, can effectively avoid the crooked situation of steel, reach the national standard requirement, avoid the rod because of the surface hardening phenomenon that brings after the crooked aligning, satisfy user's demand.
Description
Technical Field
The invention belongs to the technical field of metal pressure processing, and particularly relates to a method for improving hot rolling straightness of a bar and controlling bending.
Background
In the field of metal press working, hot rolling is the plastic deformation of metal by a rolling mill at a temperature above the recrystallization temperature of the metal. The hot rolling process generally comprises raw material heating, raw material rolling, finished product cooling and finished product sectional packaging. The bar is a hot rolled product, and during the hot rolling process of part of steel types such as 30CrMnTi, J30CrMnTiA, 30CrMnSiTiA and the like, the bar can be bent, and the bending degree of the bar after being straightened still can not meet the national standard requirements, thereby producing batch waste products. The bending degree refers to the bending degree of the bar in the length direction, the chord height of the bar bent in each meter length is the bending degree in each meter, the ratio of the total chord height of the total length bending to the total length is the total bending degree, and the bending degree of various rolled pieces is specified in the product standard.
The bending of rolled pieces is generally caused by uneven cooling speed and inconsistent contraction during hot rolling; the heating temperature of the raw materials is not uniform; the accessories of the rolling mill are not properly installed in the hot rolling process, and the like. At present, the rolling control bending of each rolling line bar generally adopts an on-line real-time control mode in the rolling process, for example, the guide and guard devices at the inlet and the outlet of a rolling mill are adjusted, the pressure configuration of a pass is optimized, and the like, but the final control effect is not obvious because the blank temperature is not uniform, the head-tail temperature difference, the wear of the pass is not uniform, and the like. Therefore, a rolling method capable of remarkably improving the hot rolling flatness of the bar and controlling the bending degree is needed.
Disclosure of Invention
The invention aims to provide a method for improving the hot rolling straightness of a bar and controlling bending, aiming at the existing defects, the method integrates and designs blank heating, rolling temperature control, cooling temperature control of a cooling bed and sawing and finishing of the bar, so that after the bar which is easy to bend is subjected to raw material heating, rolling temperature control and cooling control of the cooling bed, the bending condition of steel can be effectively avoided, the national standard requirement is met, the surface hardening phenomenon caused by bending and straightening of the bar is avoided, and the requirements of users are met.
The technical scheme of the invention is as follows: a method for improving hot rolling flatness of a bar to control bending comprises the following steps:
(1) heating the blank: putting the continuous casting slab into a heating furnace for heating, wherein the temperature of a preheating section is 500-950 ℃, the temperature of a heating section I is 950-1120 ℃, the temperature of a heating section II is 1120-1210 ℃, the temperature of a soaking section is 1130-1180 ℃, the heat preservation time of the soaking section is more than or equal to 35 minutes, and the total heating time is more than or equal to 210 minutes; the temperature difference of the section of the continuous casting billet is less than 30 ℃;
(2) dephosphorization by high-pressure water: after the continuous casting billet is discharged from the furnace, the continuous casting billet enters a high-pressure water descaling device to remove the iron oxide scales on the surface of the continuous casting billet;
(3) rough rolling: controlling the initial rolling temperature to be 1030-1100 ℃, and enabling the continuous casting slab to enter a roughing mill set;
(4) intermediate rolling: the rough-rolled continuous casting billet enters a middle finishing mill group;
(5) finish rolling: after medium rolling, the continuous casting billet enters a finishing mill group, and the temperature after finishing rolling, namely the finishing rolling temperature, is controlled to be 900-950 ℃;
(6) cooling by a cooling bed: after finish rolling, the obtained bars enter a multiple length cooling bed to be cooled, wherein the bars are arranged on the cooling bed at intervals of 2-3 tooth pitches; the temperature of the upper cooling bed is less than or equal to 920 ℃, and the temperature of the lower cooling bed is less than or equal to 350 ℃;
(7) sawing the bar: the bar is segmented by sawing, collected, bundled and then put into a slow cooling pit for slow cooling, and the temperature of the put into the pit is 240-300 ℃; fully and slowly cooling the bar in a slow cooling pit for 24 hours, wherein the pit outlet temperature is less than or equal to 100 ℃;
(8) finishing the bars: and (4) carrying out standard packaging after the bar is straightened, peeled and detected.
The specification of the continuous casting billet in the step (1) is 260mm multiplied by 3000mm multiplied by 7000 mm.
And (3) the water pressure of the high-pressure water descaling in the step (2) is 25 MPa.
The roughing mill group in the step (3) is provided with 7 rolling mills in total, and consists of 6 rolling mills with the diameter of 1000mm and 1 rolling mill with the diameter of 780 mm; the rolling mill is a high-rigidity short-stress-path rolling mill which is alternately arranged in a flat-crossed manner, and a head is cut by hydraulic pressure after rough rolling.
The middle finishing mill group in the step (4) consists of 6 frames of rolling mills with the diameter of 780mm, and the hydraulic shearing head is used after the middle rolling.
The finishing mill group in the step (5) consists of 4 frames of rolling mills with the diameter of 600 mm; the rolling mill is a high-rigidity short-stress-path rolling mill and adopts a flat-crossed alternative arrangement.
The invention has the beneficial effects that: according to the method, the heating temperature of the blank is controlled to ensure that the bar has proper initial rolling temperature and finish rolling temperature, and finally the upper cooling bed temperature and the lower cooling bed temperature of the bar have reasonable cooling ranges. Meanwhile, the arrangement intervals of the bars on the cooling bed are different, the cooling speed is controlled by adjusting the interval distance between the bars and the cooling bed, the bending degree of the bars during hot rolling can be effectively reduced, and the generation of bending waste products is avoided.
According to the invention, the hot rolling temperature control, the cooling bed cooling temperature control and the bar arrangement interval are verified to be synergistic through tests, and the specific verification data are shown in table 1.
Table 1: test data
As can be seen from the comprehensive analysis of the data in the table 1, the hot rolling process is controlled at the temperature, particularly the initial rolling temperature and the final rolling temperature; the temperature control of the cooling bed cooling is not a simple single factor or a simple superposition of the upper and lower cooling bed temperatures and the arrangement of the bars on the cooling bed, but rather a cross synergistic effect of several factors.
Drawings
FIG. 1 is a schematic view of a rolling process.
FIG. 2 is a schematic diagram of cooling of the cooling bed.
Wherein, 1 is a heating furnace; 2, descaling by high-pressure water; 3 is a roughing mill group; 4, hydraulic shears; 5 is a middle mill group; 6 is a hydraulic shear; 7 is a finishing mill group; 8 is a multiple length cooling bed; 9 is a bar; 10 is a cooling bed rack; and 11 is a tooth profile angle.
Detailed Description
The technical solution of the present invention will be described in detail by examples.
Example 1
Taking the production of a J30CrMnTiA finished product bar with the specification of phi 90mm as an example, the method for improving the hot rolling straightness of the bar and controlling the bending comprises the following steps:
(1) heating the blank: weighing a continuous casting billet with the specification of 260mm multiplied by 3000mm multiplied by 7000mm through a process, measuring the length, loading the continuous casting billet into a walking beam type heating furnace through a furnace roller way and a billet drawing-in machine for heating, wherein the temperature of a preheating section is 860 ℃, the temperature of a heating section I is 1120 ℃, the temperature of a heating section II is 1210 ℃, the temperature of a soaking section is 1180 ℃, the heat preservation time of the soaking section is more than or equal to 35 minutes, and the total heating time is 210 minutes; the temperature difference of the section of the continuous casting billet is less than 30 DEG C
(2) Dephosphorization by high-pressure water: after the continuous casting billet is discharged from the furnace, the continuous casting billet enters a high-pressure water descaling device, the water pressure is 25MPa, and the iron oxide scales on the surface of the continuous casting billet are removed;
(3) rough rolling: the initial rolling temperature is controlled at 1050 ℃, the continuous casting billet enters a roughing mill group, the roughing mill group is provided with 7 rolling mills in total, and the roughing mill group consists of 6 rolling mills with the diameter of 1000mm and 1 rolling mill with the diameter of 780 mm; the rolling mill is a high-rigidity short-stress-path rolling mill, is arranged in a flat-crossed alternative mode, and is subjected to hydraulic shearing after rough rolling;
(4) intermediate rolling: the roughly rolled continuous casting blank enters a middle finishing mill group, the middle finishing mill group consists of 6 frames of rolling mills with the diameter of 780mm, and a hydraulic shearing head is arranged after the middle rolling;
(5) finish rolling: after the continuous casting billet is subjected to intermediate rolling, the continuous casting billet enters a finishing mill group, and the finishing mill group consists of 4 frames of rolling mills with the diameter of 600 mm; the rolling mill is a high-rigidity short-stress-path rolling mill and adopts a flat-crossed alternative arrangement; controlling the temperature after finish rolling, namely the finish rolling temperature to be 900-950 ℃;
(6) cooling by a cooling bed: after finish rolling, the obtained bars enter a multiple length cooling bed to be cooled, wherein the bars are arranged on the cooling bed at intervals of 2-3 tooth pitches; the temperature of an upper cooling bed is 910 ℃, and the temperature of a lower cooling bed is 270 ℃;
(7) sawing the bar: the bar is segmented by sawing, collected, bundled and then put into a slow cooling pit for slow cooling, and the temperature of the put into the pit is 240 ℃; fully and slowly cooling the bar in a slow cooling pit for 24 hours at the pit outlet temperature of 70 ℃;
(8) finishing the bars: and (4) carrying out standard packaging after the bar is straightened, peeled and detected.
The degree of bending of the steel material obtained in example 1 is shown in Table 2.
Table 2: degree of bending of steel
As can be seen from Table 2, the percentage of per meter bending of the steel obtained by conventional rolling is much higher than that of per meter bending of more than 2.5 mm; in contrast to the steel rolled according to the method described in example 1, the percentage of 4mm per meter of camber is much lower than > 2.5mm per meter of camber. Compared with the conventional rolling, the steel rolled by the method in the embodiment 1 has the advantages that the proportion of the steel in the embodiment 1 reaching the national standard 1 group is increased by 63 percent, and the proportion of the steel in the national standard 2 group is reduced by 63 percent.
Example 2
Taking the production of a bar with the specification of phi 70mm of a 30CrMnSiTiA finished product as an example, the method for improving the hot rolling straightness of the bar and controlling the bending comprises the following steps:
(1) heating the blank: weighing a continuous casting billet with the specification of 260mm multiplied by 3000mm multiplied by 7000mm through a process, measuring the length, loading the continuous casting billet into a walking beam type heating furnace through a furnace roller way and a billet drawing-in machine for heating, wherein the temperature of a preheating section is 865 ℃, the temperature of a heating section I is 1120 ℃, the temperature of a heating section II is 1210 ℃, the temperature of a soaking section is 1180 ℃, the heat preservation time of the soaking section is more than or equal to 35 minutes, the total heating time is 210 minutes, and the temperature difference of the section of the continuous casting billet is less than 30 ℃;
(2) dephosphorization by high-pressure water: after the continuous casting billet is discharged from the furnace, the continuous casting billet enters a high-pressure water descaling device, the water pressure is 25MPa, and the iron oxide scales on the surface of the continuous casting billet are removed;
(3) rough rolling: the initial rolling temperature is controlled at 1040 ℃, the continuous casting blank enters a roughing mill group, the roughing mill group is provided with 7 rolling mills in total, and the roughing mill group consists of 6 rolling mills with the diameter of 1000mm and 1 rolling mill with the diameter of 780 mm; the rolling mill is a high-rigidity short-stress-path rolling mill, is arranged in a flat-crossed alternative mode, and is subjected to hydraulic shearing after rough rolling;
(4) intermediate rolling: the roughly rolled continuous casting blank enters a middle finishing mill group, the middle finishing mill group consists of 6 frames of rolling mills with the diameter of 780mm, and a hydraulic shearing head is arranged after the middle rolling;
(5) finish rolling: after the continuous casting billet is subjected to intermediate rolling, the continuous casting billet enters a finishing mill group, and the finishing mill group consists of 4 frames of rolling mills with the diameter of 600 mm; the rolling mill is a high-rigidity short-stress-path rolling mill and adopts a flat-crossed alternative arrangement; controlling the temperature after finish rolling, namely the finish rolling temperature to be 900-950 ℃;
(6) cooling by a cooling bed: after finish rolling, the obtained bars enter a multiple length cooling bed to be cooled, wherein the bars are arranged on the cooling bed at intervals of 2-3 tooth pitches; the temperature of an upper cooling bed is 910 ℃, and the temperature of a lower cooling bed is 270 ℃;
(7) sawing the bar: the bar is segmented by sawing, collected, bundled and then put into a slow cooling pit for slow cooling, and the temperature of the put into the pit is 240 ℃; fully and slowly cooling the bar in a slow cooling pit for 24 hours at the pit outlet temperature of 60 ℃;
(8) finishing the bars: and (4) carrying out standard packaging after the bar is straightened, peeled and detected.
The degree of bending of the steel material obtained in example 2 is shown in Table 3.
Table 3: degree of bending of steel
As can be seen from Table 3, the percentage of per meter of bending > 4mm in the steel obtained by conventional rolling is much higher than per meter of bending > 2.5 mm; in contrast to the steel rolled according to the method described in example 2, the percentage of 4mm per meter of camber is much lower than > 2.5mm per meter of camber. Compared with the conventional rolling, the steel rolled by the method in the embodiment 2 has the advantages that the proportion of the steel reaching the national standard 1 group in the embodiment 2 is increased by 74 percent, and the proportion of the national standard 2 group is reduced by 74 percent.
Example 3
Taking the production of a bar with the specification of phi 85mm of a 30CrMnTi finished product as an example, the method for improving the hot rolling straightness of the bar and controlling bending comprises the following steps:
(1) heating the blank: weighing a continuous casting billet with the specification of 260mm multiplied by 3000mm multiplied by 7000mm through a process, measuring the length, loading the continuous casting billet into a walking beam type heating furnace through a furnace roller way and a billet drawing machine for heating, wherein the temperature of a preheating section is 870 ℃, the temperature of a heating section I is 1120 ℃, the temperature of a heating section II is 1210 ℃, the temperature of a soaking section is 1180 ℃, the heat preservation time of the soaking section is more than or equal to 35 minutes, the total heating time is 210 minutes, and the temperature difference of the section of the continuous casting billet is less than 30 ℃;
(2) dephosphorization by high-pressure water: after the continuous casting billet is discharged from the furnace, the continuous casting billet enters a high-pressure water descaling device, the water pressure is 25MPa, and the iron oxide scales on the surface of the continuous casting billet are removed;
(3) rough rolling: the initial rolling temperature is controlled at 1050 ℃, the continuous casting billet enters a roughing mill group, the roughing mill group is provided with 7 rolling mills in total, and the roughing mill group consists of 6 rolling mills with the diameter of 1000mm and 1 rolling mill with the diameter of 780 mm; the rolling mill is a high-rigidity short-stress-path rolling mill, is arranged in a flat-crossed alternative mode, and is subjected to hydraulic shearing after rough rolling;
(4) intermediate rolling: the roughly rolled continuous casting blank enters a middle finishing mill group, the middle finishing mill group consists of 6 frames of rolling mills with the diameter of 780mm, and a hydraulic shearing head is arranged after the middle rolling;
(5) finish rolling: after the continuous casting billet is subjected to intermediate rolling, the continuous casting billet enters a finishing mill group, and the finishing mill group consists of 4 frames of rolling mills with the diameter of 600 mm; the rolling mill is a high-rigidity short-stress-path rolling mill and adopts a flat-crossed alternative arrangement; controlling the temperature after finish rolling, namely the finish rolling temperature to be 900-950 ℃;
(6) cooling by a cooling bed: after finish rolling, the obtained bars enter a multiple length cooling bed to be cooled, wherein the bars are arranged on the cooling bed at intervals of 2-3 tooth pitches; the temperature of an upper cooling bed is 910 ℃, and the temperature of a lower cooling bed is 270 ℃;
(7) sawing the bar: the bar is segmented by sawing, collected, bundled and then put into a slow cooling pit for slow cooling, and the temperature of the put into the pit is 240 ℃; fully and slowly cooling the bar in a slow cooling pit for 24 hours at the pit outlet temperature of 60 ℃;
(8) finishing the bars: and (4) carrying out standard packaging after the bar is straightened, peeled and detected.
The degree of bending of the steel material obtained in example 3 is shown in Table 4.
Table 4: degree of bending of steel
As can be seen from Table 4, the percentage of per meter of bending > 4mm in the steel obtained by conventional rolling is much higher than per meter of bending > 2.5 mm; in contrast to the steel rolled according to the method described in example 3, the percentage of 4mm per meter of camber is much lower than 2.5mm per meter of camber. Compared with the conventional rolling, the steel rolled by the method in the embodiment 3 has the advantages that the proportion of the steel reaching the national standard 1 group in the embodiment 3 is increased by 74 percent, and the proportion of the steel reaching the national standard 2 group is reduced by 74 percent.
Claims (6)
1. A method for improving the hot rolling straightness of a bar and controlling bending is characterized by comprising the following steps:
(1) heating the blank: putting the continuous casting slab into a heating furnace for heating, wherein the temperature of a preheating section is 500-950 ℃, the temperature of a heating section I is 950-1120 ℃, the temperature of a heating section II is 1120-1210 ℃, the temperature of a soaking section is 1130-1180 ℃, the heat preservation time of the soaking section is more than or equal to 35 minutes, and the total heating time is more than or equal to 210 minutes; the temperature difference of the section of the continuous casting billet is less than 30 ℃;
(2) dephosphorization by high-pressure water: after the continuous casting billet is discharged from the furnace, the continuous casting billet enters a high-pressure water descaling device to remove the iron oxide scales on the surface of the continuous casting billet;
(3) rough rolling: controlling the initial rolling temperature to be 1030-1100 ℃, and enabling the continuous casting slab to enter a roughing mill set;
(4) intermediate rolling: the rough-rolled continuous casting billet enters a middle finishing mill group;
(5) finish rolling: after medium rolling, the continuous casting billet enters a finishing mill group, and the temperature after finishing rolling, namely the finishing rolling temperature, is controlled to be 900-950 ℃;
(6) cooling by a cooling bed: after finish rolling, the obtained bars enter a multiple length cooling bed to be cooled, wherein the bars are arranged on the cooling bed at intervals of 2-3 tooth pitches; the temperature of the upper cooling bed is less than or equal to 920 ℃, and the temperature of the lower cooling bed is less than or equal to 350 ℃;
(7) sawing the bar: the bar is segmented by sawing, collected, bundled and then put into a slow cooling pit for slow cooling, and the temperature of the put into the pit is 240-300 ℃;
fully and slowly cooling the bar in a slow cooling pit for 24 hours, wherein the pit outlet temperature is less than or equal to 100 ℃;
(8) finishing the bars: and (4) carrying out standard packaging after the bar is straightened, peeled and detected.
2. The method for improving hot rolling flatness controlled bending of a bar according to claim 1, wherein the slab size in step (1) is 260mm x 3000mm x 7000 mm.
3. The method for improving hot rolling flatness controlled bending of a rod according to claim 1, wherein the water pressure for the high pressure water descaling in the step (2) is 25 MPa.
4. The method for improving the hot rolling flatness controlled bending of a bar according to claim 1, wherein the roughing mill train in step (3) is provided with 7 rolling mills, which are composed of 6 rolling mills with a diameter of 1000mm and 1 rolling mill with a diameter of 780 mm; the rolling mill is a high-rigidity short-stress-path rolling mill which is alternately arranged in a flat-crossed manner, and a head is cut by hydraulic pressure after rough rolling.
5. The method for improving hot rolling flatness controlled bending of bars according to claim 1, wherein the intermediate finishing mill group in step (4) consists of 6 stands of 780mm rolling mills, and the intermediate rolling is followed by hydraulic shearing heads.
6. The method for improving hot rolling flatness controlled bending of a bar according to claim 1, wherein the finishing mill set in step (5) is comprised of 4 stands of a 600mm mill; the rolling mill is a high-rigidity short-stress-path rolling mill and adopts a flat-crossed alternative arrangement.
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| CN114130835A (en) * | 2021-11-26 | 2022-03-04 | 山东钢铁股份有限公司 | Production method of 35CrMnSiA round steel applied to high-speed high-load shaft |
| CN114888075A (en) * | 2022-04-13 | 2022-08-12 | 大冶特殊钢有限公司 | Rolling method of 80Mn14Ti drill core for drill tool |
| CN115365294A (en) * | 2022-09-02 | 2022-11-22 | 宝武杰富意特殊钢有限公司 | Control method for improving bending degree of hot-rolled round steel |
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| CN115466828A (en) * | 2022-08-23 | 2022-12-13 | 石钢京诚装备技术有限公司 | Production method for improving flexibility of low-alloy high-strength steel |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106216391A (en) * | 2016-08-09 | 2016-12-14 | 湖北新冶钢有限公司 | A kind of rolling production method reducing 42CrMo hardness |
| CN108994078A (en) * | 2018-06-11 | 2018-12-14 | 山东钢铁股份有限公司 | A kind of middle bar controlled rolling and controlled cooling method |
| CN111957745A (en) * | 2020-07-10 | 2020-11-20 | 山东钢铁股份有限公司 | Hot rolling controlled cooling method for low-alloy high-strength large-size bar |
| CN112792126A (en) * | 2020-12-18 | 2021-05-14 | 山东钢铁股份有限公司 | Hot rolling method of bearing steel with large compression ratio |
| CN113058995A (en) * | 2021-03-31 | 2021-07-02 | 山东钢铁股份有限公司 | Hot rolling method of bar for high-wear-resistance medium-alloy large-size bucket teeth |
-
2021
- 2021-08-10 CN CN202110914756.7A patent/CN113600611A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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