CN114700364B - Method for improving hot rolling stability of 75Cr1 saw blade steel - Google Patents
Method for improving hot rolling stability of 75Cr1 saw blade steel Download PDFInfo
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- CN114700364B CN114700364B CN202210326322.XA CN202210326322A CN114700364B CN 114700364 B CN114700364 B CN 114700364B CN 202210326322 A CN202210326322 A CN 202210326322A CN 114700364 B CN114700364 B CN 114700364B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 47
- 239000010959 steel Substances 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000005098 hot rolling Methods 0.000 title claims abstract description 25
- 238000005096 rolling process Methods 0.000 claims abstract description 73
- 238000001816 cooling Methods 0.000 claims abstract description 16
- 238000010438 heat treatment Methods 0.000 claims abstract description 10
- 230000008569 process Effects 0.000 claims description 14
- 238000005452 bending Methods 0.000 claims description 9
- 238000010079 rubber tapping Methods 0.000 claims description 8
- 238000005520 cutting process Methods 0.000 claims description 7
- 230000009286 beneficial effect Effects 0.000 claims description 6
- 238000009826 distribution Methods 0.000 claims description 6
- 230000009467 reduction Effects 0.000 claims description 5
- 230000033764 rhythmic process Effects 0.000 claims description 4
- 239000011229 interlayer Substances 0.000 claims description 3
- 238000004886 process control Methods 0.000 claims description 3
- 238000013000 roll bending Methods 0.000 claims description 3
- 238000010583 slow cooling Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 230000009466 transformation Effects 0.000 abstract description 3
- 230000006872 improvement Effects 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 10
- 230000007547 defect Effects 0.000 description 5
- 238000007689 inspection Methods 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 239000011572 manganese Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—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 plates, strips, bands or sheets of indefinite length
- B21B1/24—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 plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
- B21B1/26—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 plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—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
- B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates
-
- 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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention discloses a method for improving the hot rolling stability of 75Cr1 saw blade steel, which can achieve the effect by optimizing the technological parameters of heating, rolling, cooling, coiling and the like in the hot rolling procedure, does not need to carry out equipment and system transformation, and is easy to obviously improve the hot rolling stability of the 75Cr1 saw blade steel. The scheme is applied to industrial tests in hot continuous rolling in a factory 1450, the effect is obvious, and the hot rolling stability of 75Cr1 saw blade steel is effectively improved.
Description
Technical Field
The invention relates to the field of rolling of coiled plates, in particular to a method for improving hot rolling stability of 75Cr1 saw blade steel.
Background
The carbon content of the 75Cr1 saw blade steel is 0.70-0.80%, and the saw blade steel has hardenability, toughness and high surface quality, is widely applied to saw blade industries such as diamond saw, stone saw and the like, and is known as a crown on the saw blade steel. Because the content of carbon, manganese and chromium in the steel is high, the steel has overheat sensitivity, and a plurality of unstable factors exist in the production process, and the main appearance is as follows:
(1) The rolling load is large.
(2) The problem of poor plate shape such as middle waves and side waves is prominent.
(3) During the finish rolling process, crushing and tail flicking accidents easily occur, and the production rhythm is seriously influenced.
(4) Roll mark defects frequently occur.
(5) Flat rolls are easy to generate.
Therefore, the hot rolling stability of the 75Cr1 saw blade steel becomes a production technical bottleneck and needs to be solved urgently.
CN105734403B discloses a hot rolled coil for saw blade steel and a production method thereof, which adopts the following technology: the thickness of the intermediate blank is set to be 30-50 mm, rough rolling is carried out for 5 times, the final rolling temperature after seven finishing mill groups are used for rolling is 880-920 ℃, and the curling temperature is 730-770 ℃; strong cold water and surface cooling water among frames in the rolling process are not used, so that cracking caused by chilling is prevented; the rolling force among the finishing mill frames, particularly the F4-F7 rolling force is reduced from front to back in a range of 200-300 tons in sequence, so that unstable threading caused by rebound of the rolling force is avoided; the bending force is 50-150 tons, and the small bending force of the rear frame is controlled by adopting micro-double-side wave threading rolling. The method adopts high coiling temperature (730-770 ℃), greatly increases the probability of flat coil, adopts micro-edge wave rolling, is not easy to control edge wave, does not need to finish the rolling in excessive wave, and increases the rolling cost.
CN101745535B discloses a method for producing 75Cr1 hot rolled steel sheet, which adopts the following technique: the superheat degree T of molten steel is more than 30 ℃ and less than or equal to 45 ℃, the temperature T of a casting blank entering a furnace is more than or equal to 900 ℃ and less than or equal to 1050 ℃, the final rolling temperature T is more than or equal to 850 ℃ and less than or equal to 950 ℃, the coiling temperature T is more than or equal to 550 ℃ and less than or equal to 630 ℃, and the continuous casting pulling speed S is more than or equal to 3.5m/min and less than or equal to 5.5m/min; casting with mold flux; the molten steel comprises the following chemical components: 0.70 to 0.80 percent of C, 0.20 to 0.45 percent of Si, 0.60 to 0.90 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.025 percent of S, 0.30 to 0.60 percent of Cr and 0.02 to 0.08 percent of V. The 75Cr strength and hardness are very high, the method adopts low-temperature coiling, the coiling process is easy to crack, and the damage to coiling equipment is large. The coil strength is high due to low-temperature coiling, and the subsequent leveling and cutting are not facilitated.
Disclosure of Invention
In view of the deficiencies of the prior art, it is an object of the present invention to provide a method for improving the hot rolling stability of 75Cr1 saw blade steel which is easy to implement without equipment and system modifications.
In order to achieve the aim of the invention, the invention adopts the following technical scheme:
A method for improving hot rolling stability of 75Cr1 saw blade steel comprises the following steps: feeding, heating, hot rolling, laminar cooling, coiling, warehouse entry and stacking cooling, and leveling, wherein the method comprises the following steps of: in the feeding process, the head-tail width difference value and the width reduction of the blank are ensured to be as small as possible; the heating process adopts hot charging, the furnace time is reduced, and the tapping temperature is controlled; in the hot rolling process, the rough rolling stage controls the rhythm, reduces the online steel time and the like, optimizes the thickness of the intermediate billet, and achieves the purposes of reducing the temperature loss of the intermediate billet and improving the rough rolling outlet temperature of the intermediate billet; before the intermediate billet enters a finish rolling stage, performing head cutting treatment to improve the finish rolling threading stability, correcting the load distribution of a finishing mill in the finish rolling stage, forcing the roll bending force of the finishing mill, adopting positive tolerance rolling, avoiding the generation of medium waves of strip steel, and improving the dimensional accuracy; the coiling process controls the coiling tension, increases the middle temperature compensation, optimizes the coil unloading time and improves the coil shape quality.
The improvement is that the difference value of the head and tail widths of the width-adjustable blanks and the width reduction amount are less than 50mm in the feeding process, so that the overload tripping of the vertical rolls caused by overlarge side pressure amount is avoided.
As improvement, the steel loading temperature is more than or equal to 400 ℃, the furnace time is more than or equal to 200min, and the steel loading time is not more than 210min, so that the temperature uniformity of the plate blank can be effectively ensured; the tapping temperature is controlled within 1260+/-20 ℃ to ensure the structure and grain size of the slab.
The improvement is that the accumulated equal steel time of each pass of rough rolling is less than or equal to 30S, the outlet temperature of rough rolling is 1040+/-20 ℃, so as to reduce the temperature drop loss in the rolling process, ensure the rolling stability and ensure the final rolling temperature hit; the thickness of the rough rolling intermediate billet is set to 33-45mm.
As an improvement, the length of the head cutting process is controlled to be 180-360mm so as to ensure that the black head part of the intermediate blank is completely cut off, thereby being beneficial to controlling the roll mark defect caused by the impact of the black head on the roll.
As an improvement, finishing mill load correction: f1: -5% to-6%, F3: -3 to-4 percent, ensuring reasonable rolling load distribution of each stand and improving the stability of rolled pass plates.
As an improvement, the thickness of the finished product is rolled by adopting a positive tolerance on the premise of meeting the delivery standard, namely, the contract thickness is +0.05mm; when the width of the finished product is more than or equal to 1250mm, F7 roller bending force is forced to be-100 to-400 in the finish rolling stage, so that the generation of medium waves is effectively avoided; the width of the finished product is less than 1250, the F7 bending roller force is forced to be +100 to 4000, and the generation of double-side waves is effectively avoided.
As an improvement, the temperature in the finishing stage is set at 880±20 ℃.
As an improvement, the coiling temperature is set to 680+/-20 ℃ so as to ensure the mechanical property of the finished product; the coiling tension is 30-35N/mm 2, the head coiling temperature is compensated for 20-50 ℃, the coil is unwound after 3-5 minutes in a coiling machine, so as to reduce the interlayer gap of the finished coil, and the coil is given proper slow cooling time, thereby being beneficial to preventing flat coils.
As an improvement, the uncooled length of the tail part of the laminar cooling in the laminar cooling process is set to be 5-15 meters, so that the impact on coiling equipment is reduced, and the winding of the finished outer ring is ensured.
The beneficial effects are that:
compared with the prior art, the method for improving the hot rolling stability of the 75Cr1 saw blade steel can achieve the effect by optimizing the process parameters of heating, rolling, cooling, coiling and the like in the hot rolling process, does not need equipment and system transformation, and is easy to obviously improve the hot rolling stability of the 75Cr1 saw blade steel.
Detailed Description
The invention is further illustrated by the following examples: the invention will be better understood from the following examples. However, it will be readily understood by those skilled in the art that the specific material ratios, process conditions and results thereof described in the examples are illustrative of the present invention and should not be construed as limiting the invention described in detail in the claims.
A method for improving hot rolling stability of 75Cr1 saw blade steel comprises the following steps: feeding, heating, hot rolling, laminar cooling, coiling, warehouse entry and stacking cooling, and leveling, wherein the method comprises the following steps of: in the feeding process, the head-tail width difference value and the width reduction of the blank are ensured to be as small as possible; the heating process adopts hot charging, the furnace time is reduced, and the tapping temperature is controlled; in the hot rolling process, the rough rolling stage controls the rhythm, reduces the online steel time and the like, optimizes the thickness of the intermediate billet, and achieves the purposes of reducing the temperature loss of the intermediate billet and improving the rough rolling outlet temperature of the intermediate billet; before the intermediate billet enters a finish rolling stage, performing head cutting treatment to improve the finish rolling threading stability, correcting the load distribution of a finishing mill in the finish rolling stage, forcing the roll bending force of the finishing mill, adopting positive tolerance rolling, avoiding the generation of medium waves of strip steel, and improving the dimensional accuracy; the coiling process controls the coiling tension, increases the middle temperature compensation, optimizes the coil unloading time and improves the coil shape quality.
In the feeding process, the head-tail width difference value and the width reduction amount of the width-adjustable blank are less than 50mm, so that the overload tripping of the vertical roller caused by overlarge side pressure is avoided.
The steel loading temperature is more than or equal to 400 ℃, the furnace time is more than or equal to 200min, and the steel loading time is not more than 210min, so that the temperature uniformity of the plate blank can be effectively ensured; the tapping temperature is controlled within 1260+/-20 ℃ to ensure the structure and grain size of the slab.
The accumulated steel waiting time of each pass of rough rolling is less than or equal to 30S, and the rough rolling outlet temperature is 1040+/-20 ℃, so that the temperature drop loss in the rolling process is reduced, the rolling stability is ensured, and the rolling stability is used as the guarantee of final rolling temperature hit; the thickness of the rough rolling intermediate billet is set to 33-45mm.
The length of the head cutting treatment is controlled to be 180-360mm so as to ensure that the black head part of the intermediate blank is completely cut off, thereby being beneficial to controlling the roll mark defect caused by the impact of the black head on the roll.
Finishing mill load correction: f1: -5% to-6%, F3: -3 to-4 percent, ensuring reasonable rolling load distribution of each stand and improving the stability of rolled pass plates.
On the premise that the thickness of the finished product meets the delivery standard, rolling with positive tolerance, namely, the contract thickness is +0.05mm; when the width of the finished product is more than or equal to 1250mm, F7 roller bending force is forced to be-100 to-400 in the finish rolling stage, so that the generation of medium waves is effectively avoided; the width of the finished product is less than 1250, the F7 bending roller force is forced to be +100 to 4000, and the generation of double-side waves is effectively avoided.
The temperature in the finishing stage is set at 880.+ -. 20 ℃.
Setting 680+/-20 ℃ of coiling temperature to ensure the mechanical property of the finished product; the coiling tension is 30-35N/mm 2, the head coiling temperature is compensated for 20-50 ℃, the coil is unwound after 3-5 minutes in a coiling machine, so as to reduce the interlayer gap of the finished coil, and the coil is given proper slow cooling time, thereby being beneficial to preventing flat coils.
In the laminar cooling process, the uncooled length of the tail part of the laminar cooling is set to be 5-15 meters so as to reduce the impact on coiling equipment and ensure the coiling of the finished outer ring.
The following is combined with a hot continuous rolling production line of a certain factory 1450, 25 rolls of 75Cr1 saw blade steel are produced in batches, the specification of a finished product is 3.5mm or 1250mm, and the chemical components and mass percentages of the 75Cr1 saw blade steel are as follows: c0.72-0.78, si:0.25-0.35, mn:0.65-0.75, cr:0.40-0.50, al:0.020-0.045, S < 0.0050, P < 0.015, and the balance Fe; the production line comprises the following process flows: feeding, heating, hot rolling, laminar cooling, coiling, warehouse entry and cold stacking, and leveling.
Example 1
A method for improving hot rolling stability of 75Cr1 saw blade steel comprises the following specific parameters:
(1) The width of the slab is reduced by 30mm;
(2) The steel loading temperature is 474 ℃. The furnace time is 210min;
(3) The tapping temperature is 1278 ℃;
(4) Accumulating the steel waiting time 26S for each rough rolling pass, and performing rough rolling at an outlet temperature 1055;
(5) The thickness of the rough rolling intermediate billet is set to be 35mm;
(6) The length of the flying shear head is controlled to be 220mm;
(7) The thickness of the finished product is controlled to be 3.05 mm;
(8) Finishing mill load correction: f1: -5% to-6%, F3: -3% to-4%;
(9) F7, forced bending force is-350;
(10) The final rolling temperature is 889 ℃;
(11) The tail part of the laminar cooling is 10 meters uncooled;
(12) Setting the coiling temperature to 682 ℃;
(13) The coiling tension is 32N/mm 2;
(14) Compensating the coiling temperature of the head by 50 ℃;
(15) The coil is removed after 3 minutes in a coiling machine.
And (3) carrying out inspection according to a hot coil inspection procedure, wherein the experimental result is as follows: the 25 rolls are stable in production, the rolling force of finish rolling F1 and F3 is only 2400 tons at the maximum, no roll marks, waves and flat rolls are generated, and the defect occurrence ratio is 0%.
Comparative example 1
Related technological parameters, which are not defined, are all carried out according to the prior art:
(1) The width of the slab is reduced by 30mm;
(2) The steel loading temperature is 365 ℃. The furnace time is 190min;
(3) The tapping temperature is 1258 ℃;
(4) Accumulating the steel waiting time 42S of each pass of rough rolling, and controlling the rough rolling outlet temperature to 1023;
(5) The thickness of the rough rolling intermediate billet is set to be between 40 mm;
(6) The length of the flying shear head is controlled to be 150mm;
(7) The thickness of the finished product is controlled to be 3.5 mm;
(8) Load distribution of the finishing mill is not corrected;
(9) F7 roller force +100;
(10) The final rolling temperature is 895 ℃;
(11) Laminar cooling tail part is totally cold;
(12) Setting the coiling temperature to 678 ℃;
(13) The coiling tension is 23N/mm <2 >;
(14) Compensating the coiling temperature of the head by 150 ℃;
(15) The coil is removed after 1 minute in the coiling machine.
And (3) carrying out inspection according to a hot coil inspection procedure, wherein the experimental result is as follows: the production of 25 rolls is unstable, the rolling force of finish rolling F1 and F3 is up to 2880 tons, and the tail is thrown and the roll is changed once. Roll marks (2 rolls), waves (1 roll) and flat rolls (8 rolls) in terms of quality, and the defect occurrence rate is 44%.
The 75Cr1 saw blade steel has wide application field, the improvement of the production process has great significance in energy consumption and quality, and the hot rolling stability of the 75Cr1 saw blade steel can be effectively improved by optimizing the process parameters of heating, rolling, cooling, coiling and the like in the hot rolling process and comparing the embodiment 1 with the comparison example 1. The hot rolling stability of the 75Cr1 saw blade steel is obviously improved without equipment and system transformation, and the method is very suitable for industrial production.
In the foregoing, the protection scope of the present invention is not limited to the preferred embodiments of the present invention, and any simple changes or equivalent substitutions of the technical solutions that can be obviously obtained by those skilled in the art within the technical scope of the present invention disclosed in the present invention fall within the protection scope of the present invention.
Claims (1)
1. A method for improving hot rolling stability of 75Cr1 saw blade steel comprises the following steps: the method is characterized in that the difference value of the head and the tail width and the width reduction of the blank are ensured to be less than 50mm in the feeding process; the heating process adopts hot charging, the furnace time is reduced, and the tapping temperature is controlled; the method comprises the steps of controlling the rhythm, reducing the online waiting time of steel in the rough rolling stage and optimizing the thickness of an intermediate billet in the hot rolling process, so as to achieve the purposes of reducing the temperature loss of the intermediate billet and improving the rough rolling outlet temperature of the intermediate billet, wherein the steel temperature in the heating process is more than or equal to 400 ℃, the furnace time is more than or equal to 200min, the steel tapping temperature is controlled to be 1260+/-20 ℃ and the steel not more than 210 min; the accumulated equal steel time of each pass in the rough rolling stage is less than or equal to 30S, and the rough rolling outlet temperature is 1040+/-20 ℃; the thickness of the rough rolling intermediate billet is 33-45mm; before the intermediate billet enters the finish rolling stage, carrying out head cutting treatment, wherein the length of the head cutting treatment is controlled to be 180-360mm, the finish rolling threading stability is improved, the load distribution of a finishing mill is corrected, the roll bending force of the finishing mill is forced, and positive tolerance rolling is adopted in the finish rolling stage, wherein the load of the finishing mill is corrected: f1: -5% to-6%, F3: 3 to 4 percent of the thickness of the finished product is rolled by adopting a positive tolerance on the premise of meeting delivery standards, namely, the thickness of the finished product is +0.05mm by controlling the temperature of 880+/-20 ℃ of the final rolling to ensure the mechanical property of the finished product; when the width of the finished product is more than or equal to 1250mm, F7 roller bending force is forced to be-100 to-400 in the finish rolling stage, so that the generation of medium waves is effectively avoided; the width of the finished product is less than 1250, the F7 roller bending force is forced to be +100 to 4000, and the generation of double-side waves is effectively avoided; the coiling process controls the coiling tension, increases the middle temperature compensation, optimizes the coil unloading time and improves the coil shape quality, wherein the temperature in the coiling process is set to 680+/-20 ℃, the coiling tension is 30-35N/mm 2, the head coiling temperature is compensated to 20-50 ℃, and the coil is unloaded after 3-5 minutes in a coiling machine so as to reduce the interlayer gap of the finished coil and give the coil a proper slow cooling time, thereby being beneficial to preventing flat coils; in the laminar cooling process, the uncooled length of the tail part of the laminar cooling is set to be 5-15 m.
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| CN101745535A (en) * | 2010-01-21 | 2010-06-23 | 广州珠江钢铁有限责任公司 | Method for producing 75Cr1 hot-rolled sheet steel |
| CN102134681A (en) * | 2010-01-22 | 2011-07-27 | 宝山钢铁股份有限公司 | Steel for saw blade substrate and manufacturing method thereof |
| KR20120052022A (en) * | 2010-11-15 | 2012-05-23 | 주식회사 포스코 | Method for manufacturing tensile strength 590mpa class hot rolled dp steel with excellent workability and variation of mechanical property |
| CN103157658A (en) * | 2013-04-12 | 2013-06-19 | 湖南华菱涟源钢铁有限公司 | Process for rolling stainless steel coil on conventional hot continuous rolling production line |
| CN103878178A (en) * | 2014-03-04 | 2014-06-25 | 河北钢铁股份有限公司唐山分公司 | Method for producing ultrathin hot-rolled coils from sheet billets by continuous casting and rolling |
| CN104099520A (en) * | 2014-07-14 | 2014-10-15 | 首钢总公司 | High-carbon and low-alloy saw blade steel and production method of hot-rolled steel plate thereof |
| CN105734403A (en) * | 2016-03-04 | 2016-07-06 | 河北钢铁股份有限公司承德分公司 | Hot-rolled coil for saw blade steel and production method of hot-rolled coil |
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