CN114700364A - 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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- CN114700364A CN114700364A CN202210326322.XA CN202210326322A CN114700364A CN 114700364 A CN114700364 A CN 114700364A CN 202210326322 A CN202210326322 A CN 202210326322A CN 114700364 A CN114700364 A CN 114700364A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 55
- 239000010959 steel Substances 0.000 title claims abstract description 55
- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000005098 hot rolling Methods 0.000 title claims abstract description 35
- 238000005096 rolling process Methods 0.000 claims abstract description 77
- 230000008569 process Effects 0.000 claims abstract description 16
- 238000001816 cooling Methods 0.000 claims abstract description 13
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 238000013000 roll bending Methods 0.000 claims description 9
- 230000009467 reduction Effects 0.000 claims description 8
- 238000010079 rubber tapping Methods 0.000 claims description 8
- 238000005520 cutting process Methods 0.000 claims description 7
- 238000009826 distribution Methods 0.000 claims description 6
- 238000005452 bending Methods 0.000 claims description 4
- 230000009286 beneficial effect Effects 0.000 claims description 4
- 239000011229 interlayer Substances 0.000 claims description 3
- 238000004886 process control Methods 0.000 claims description 3
- 230000033764 rhythmic process Effects 0.000 claims description 3
- 238000010583 slow cooling Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 4
- 230000009466 transformation Effects 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 description 10
- 230000006872 improvement Effects 0.000 description 8
- 230000007547 defect Effects 0.000 description 6
- 206010000496 acne Diseases 0.000 description 4
- 239000011651 chromium Substances 0.000 description 3
- 239000011572 manganese Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000007689 inspection Methods 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
- 230000002146 bilateral effect Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000003247 decreasing effect 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
- 238000009776 industrial production Methods 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000002893 slag Substances 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
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
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 process parameters of the hot rolling process, such as heating, rolling, cooling, coiling and the like, and can easily and obviously improve the hot rolling stability of the 75Cr1 saw blade steel without equipment and system transformation. The technical scheme is subjected to industrial tests and application in 1450 hot continuous rolling in a certain factory, the effect is obvious, and the hot rolling stability of the 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 75Cr1 saw blade steel contains 0.70-0.80% of carbon, has hardenability, obdurability and high surface quality, is widely applied to the saw blade industries of diamond saws, stone saws and the like, and is known as a crown on the saw blade steel. Because the steel has high contents of carbon, manganese and chromium and has overheating sensitivity, a plurality of unstable factors exist in the production process, and the factors are mainly reflected in that:
(1) the rolling load is large.
(2) The problems of poor plate shapes such as medium waves, edge waves and the like are prominent.
(3) The rolling and milling process is easy to have crushing and tail flicking accidents, and the production rhythm is seriously influenced.
(4) Roll mark defects occur frequently.
(5) The flat roll is easy to generate.
Therefore, the hot rolling stability of the 75Cr1 saw blade steel becomes a technical bottleneck of production, 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, the intermediate blank is subjected to rough rolling for 5 times, the final rolling temperature is 880-920 ℃ after being rolled by seven finishing mill groups, and the curling temperature is 730-770 ℃; strong cold water between frames and surface cooling water are not used in the rolling process, so that cracking caused by chilling is prevented; the rolling force between the finishing mill frames is particularly decreased gradually from front to back according to the range of 200-300 tons from F4-F7, so that the phenomenon that the threading is unstable due to the rebound of the rolling force is avoided; the roll bending force is 50-150 tons, the small roll bending force of the rear frame is controlled, and micro bilateral wave penetrating rolling is adopted. The method adopts high coiling temperature (730-770 ℃), greatly increases the probability of flat coiling, adopts micro-edge wave rolling, is not easy to control edge waves, does not greatly increase waves, and needs finishing, thus increasing the rolling cost.
CN101745535B discloses a method for producing a 75Cr1 hot-rolled steel plate, which adopts the following technology: the superheat degree T of molten steel is more than 30 ℃ and less than or equal to 45 ℃, the charging temperature T of a casting blank is more than or equal to 900 ℃ and less than or equal to 1050 ℃, the finish rolling temperature T is more than or equal to 850 ℃ and less than or equal to 950 ℃, the coiling temperature T coil 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 5.5 m/min; casting by adopting covering slag; the molten steel comprises the following chemical components: 0.70-0.80% of C, 0.20-0.45% of Si, 0.60-0.90% of Mn, less than or equal to 0.025% of P, less than or equal to 0.025% of S, 0.30-0.60% of Cr and 0.02-0.08% of V. The strength and the hardness of the 75Cr are very high, the method adopts low-temperature coiling, the cracking is easy to occur in the coiling process, and the damage to coiling equipment is large. The low-temperature coiling causes high strength of the steel coil and is not beneficial to subsequent flat slitting.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a method for improving the hot rolling stability of 75Cr1 saw blade steel, which is easy to realize without equipment and system modification.
In order to realize the purpose 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 hot rolling process flows of the 75Cr1 saw blade steel: feeding- > heating- > hot rolling- > laminar cooling- > coiling- > warehousing and stacking cooling- > leveling, specifically: in the feeding process, the head-tail width difference and the width reduction quantity of the blank are ensured to be as small as possible; hot charging is adopted in the heating process, 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 on-line equal steel time and optimizes the thickness of the intermediate billet, thereby achieving 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, the end cutting treatment is carried out, the finish rolling threading stability is improved, the load distribution of a finish rolling mill is corrected, the roll bending force of the finish rolling mill is forced, and the positive tolerance rolling is adopted in the finish rolling stage, so that the middle wave of the strip steel is avoided, and the dimensional precision is improved; the coiling process controls the coiling tension, increases the middle temperature compensation, optimizes the coil unloading time and improves the coil quality.
The improvement is that the difference of the head width and the tail width of the width-adjusted blank and the width reduction amount in the feeding process are less than 50mm, so that the overload tripping of the vertical roll caused by overlarge side pressure is avoided.
The improvement is that the steel charging temperature is more than or equal to 400 ℃, the furnace time is more than or equal to 200min and not more than 210min, and the uniform temperature of the plate blank can be effectively ensured; the tapping temperature is controlled within 1260 plus or minus 20 ℃ to ensure the structure and the 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, and the outlet temperature of the rough rolling is 1040 +/-20 ℃, so that the temperature drop loss in the rolling process is reduced, the rolling stability is ensured, and the guarantee of the hit of the final rolling temperature is realized; the thickness of the rough rolling intermediate billet is set to be 33-45 mm.
The improved structure is characterized in that the length of the end cutting treatment is controlled to be 180-360mm, so that the blackhead part of the intermediate blank is completely cut off, and the roll mark defect caused by the impact of the blackhead on the roll is favorably controlled.
As an improvement, the load of the finishing mill is corrected: f1: -5% to-6%, F3: 3 to 4 percent below zero, ensures reasonable rolling load distribution of each frame and improves the stability of the rolled through plate.
The improvement is that the thickness of the finished product is rolled by positive tolerance on the premise of meeting delivery standards, namely the contract thickness is plus 0.05 mm; when the width of the finished product is more than or equal to 1250mm, the F7 roller bending force is forced to be-100 to-400 in the finish rolling stage, so that the generation of middle waves is effectively avoided; the width of the finished product is less than 1250, and the roll bending force of F7 is forced to be +100 to 4000, so that the generation of double-edge waves is effectively avoided.
As a refinement, the temperature setting of the final rolling stage is 880. + -. 20 ℃.
The improvement is that the coiling temperature is set to be 680 +/-20 ℃ so as to ensure the mechanical property of the finished product; coiling tension of 30-35N/mm2The coiling temperature of the head part is compensated by 20-50 ℃, and the coiling is unloaded in a coiling machine after 3-5 minutes so as to reduce the interlayer gap of the finished coil and give proper slow cooling time to the finished coil, thereby being beneficial to preventing flat coiling.
As an improvement, the non-cooling length of the laminar cooling tail in the laminar cooling process is set to be 5-15 meters so as to reduce the impact on the coiling equipment and ensure the coiling of the outer ring of the finished product.
Has the advantages 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 technological parameters of the hot rolling process, such as heating, rolling, cooling, coiling and the like, 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, those skilled in the art will readily appreciate that the specific material ratios, process conditions and results thereof described in the examples are illustrative only and should not be taken as limiting the invention as detailed in the claims.
A method for improving hot rolling stability of 75Cr1 saw blade steel comprises the following hot rolling process flows of the 75Cr1 saw blade steel: feeding- > heating- > hot rolling- > laminar cooling- > coiling- > warehousing and stacking cooling- > leveling, specifically: in the feeding process, the head-tail width difference and the width reduction quantity of the blank are ensured to be as small as possible; hot charging is adopted in the heating process, the furnace time is reduced, and the tapping temperature is controlled; in the hot rolling process, the speed is controlled in the rough rolling stage, the online equal steel time is reduced, and the thickness of the intermediate blank is optimized, so that the aims of reducing the temperature loss of the intermediate blank and improving the rough rolling outlet temperature of the intermediate blank are fulfilled; before the intermediate billet enters a finish rolling stage, the end cutting treatment is carried out, the finish rolling threading stability is improved, the load distribution of a finish rolling mill is corrected, the roll bending force of the finish rolling mill is forced, and the positive tolerance rolling is adopted in the finish rolling stage, so that the middle wave of the strip steel is avoided, and the dimensional precision is improved; the coiling process controls the coiling tension, increases the middle temperature compensation, optimizes the coil unloading time and improves the coil quality.
The width difference between the head and the tail of the wide blank is adjusted and the width reduction amount is less than 50mm in the feeding process, so that the overload tripping of the vertical roller caused by overlarge side pressure is avoided.
The steel charging temperature is more than or equal to 400 ℃, the furnace time is more than or equal to 200min and cannot exceed 210min, and the uniform temperature of the plate blank can be effectively ensured; the tapping temperature is controlled within 1260 plus or minus 20 ℃ to ensure the structure and the grain size of the slab.
The accumulated equal steel time of each pass of rough rolling is less than or equal to 30S, and the outlet temperature of the rough rolling is 1040 +/-20 ℃, so that the temperature drop loss in the rolling process is reduced, the rolling stability is ensured, and the guarantee of the final rolling temperature hit is realized; the thickness of the rough rolling intermediate billet is set to be 33-45 mm.
The length of the end cutting treatment is controlled to be 180-360mm, so that the blackhead part of the intermediate blank is completely cut off, and the roller mark defect caused by the impact of the blackhead on the roller is favorably controlled.
Correcting the load of the finishing mill: f1: -5% to-6%, F3: 3 to 4 percent below zero, ensures reasonable rolling load distribution of each frame and improves the stability of the rolled through plate.
On the premise that the thickness of the finished product meets delivery standards, positive tolerance rolling is adopted, namely the contract thickness is +0.05 mm; when the width of the finished product is more than or equal to 1250mm, the F7 roller bending force is forced to be-100 to-400 in the finish rolling stage, so that the generation of middle waves is effectively avoided; the width of the finished product is less than 1250, and the roll bending force of F7 is forced to be +100 to 4000, so that the generation of double-edge waves is effectively avoided.
The temperature setting of the final rolling stage is 880 + -20 deg.C.
The coiling temperature is set to be 680 +/-20 ℃ so as to ensure the mechanical property of the finished product; coiling tension of 30-35N/mm2The coiling temperature of the head part is compensated by 20-50 ℃, and the coil is unloaded in the coiling machine after 3-5 minutes so as to reduce the interlayer gap of the finished coil and give proper slow cooling time to the finished coil, thereby being beneficial to preventing flat coil.
In the process of laminar cooling, the uncooled length of the tail part of the laminar cooling is set to be 5-15 meters, so that the impact on coiling equipment is reduced, and the outer ring of a finished product is ensured to be coiled.
The method is characterized in that 25 coils of 75Cr1 saw blade steel is produced in batches by combining a 1450 hot continuous rolling production line in a certain factory, the specification of a finished product is 3.5 mm/1250 mm, and the 75Cr1 saw blade steel comprises the following chemical components in percentage by mass: c, 0.72-0.78, Si: 0.25-0.35, Mn: 0.65-0.75, Cr: 0.40-0.50, Al: 0.020-0.045, less than 0.0050 of S, less than 0.015 of P and the balance of Fe; the production line comprises the following process flows: feeding- > heating- > hot rolling- > laminar cooling- > coiling- > warehousing and stacking cooling- > leveling.
Example 1
A method for improving hot rolling stability of 75Cr1 saw blade steel comprises the following specific parameters:
(1) the width reduction amount of the plate blank is 30 mm;
(2) the steel charging temperature is 474 ℃. The furnace time is 210 min;
(3) the tapping temperature is 1278 ℃;
(4) the accumulated equal steel time of each pass of rough rolling is 26S, and the rough rolling outlet temperature is 1055;
(5) the thickness of the rough rolling intermediate billet is set to be 35 mm;
(6) the length of the flying shear cutting head is controlled to be 220 mm;
(7) the thickness of the finished product is controlled according to 3.05 mm;
(8) correcting the load of the finishing mill: f1: -5% to-6%, F3: -3% to-4%;
(9) f7 roll bending force is forced to be-350;
(10) the finishing temperature is 889 ℃;
(11) laminar cooling the tail part for 10m without cooling;
(12) setting the coiling temperature at 682 ℃;
(13) coiling tension of 32N/mm2；
(14) The coiling temperature of the head is compensated by 50 ℃;
(15) and unloading the coil after waiting for 3 minutes in the coiling machine.
And (3) according to the hot rolled plate inspection protocol, the experimental result is as follows: the production of 25 coils is stable, the rolling force of finish rolling F1 and F3 is only 2400 tons at most, roll marks, waves and flat coils do not occur, and the defect occurrence ratio is 0%.
Comparative example 1
The relevant process parameters, which are not clear, are carried out according to the prior art:
(1) the width reduction amount of the plate blank is 30 mm;
(2) the steel charging temperature is 365 ℃. The furnace time is 190 min;
(3) the tapping temperature is 1258 ℃;
(4) the accumulated equal steel time of each pass of rough rolling is 42S, and the outlet temperature of rough rolling is 1023;
(5) the thickness of the rough rolling intermediate billet is set to be between 40 mm;
(6) the length of the cutting head of the flying shear is controlled to be 150 mm;
(7) the thickness of the finished product is controlled according to 3.5 mm;
(8) the load distribution of the finishing mill is not corrected;
(9) f7 forced bending force + 100;
(10) the finishing temperature is 895 ℃;
(11) cooling the tail part by laminar flow;
(12) setting the coiling temperature to 678 ℃;
(13) coiling tension 23N/mm 2;
(14) the coiling temperature of the head is compensated for 150 ℃;
(15) and unloading the coil after waiting for 1 minute in the coiling machine.
And (3) according to the hot rolled plate inspection protocol, the experimental result is as follows: the production of 25 coils is unstable, the rolling force of finish rolling F1 and F3 reaches 2880 tons, and the rolls are changed once by drifting the tail. Roll mark (2 rolls), wave (1 roll) and flat roll (8 rolls) in quality, and the defect occurrence ratio is 44%.
The application field of the 75Cr1 saw blade steel is wide, the improvement of the production process has great significance on energy consumption and quality, the effect can be achieved by optimizing the process parameters of heating, rolling, cooling, coiling and the like of the hot rolling process, and the method disclosed by the invention effectively improves the hot rolling stability of the 75Cr1 saw blade steel as can be known from the comparison between the embodiment 1 and the comparative example 1. The hot rolling stability of the 75Cr1 saw blade steel is obviously improved without equipment and system modification, and the method is very suitable for industrial production.
The above description is only a preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, and any simple modifications 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 are within the scope of the present invention.
Claims (10)
1. A method for improving hot rolling stability of 75Cr1 saw blade steel comprises the following hot rolling process flows of the 75Cr1 saw blade steel: feeding- > heating- > hot rolling- > laminar cooling- > coiling- > warehousing and stacking cooling- > leveling, which is characterized in that the width difference between the head and the tail of the blank and the width reduction amount are ensured to be as small as possible in the feeding process; hot charging is adopted in the heating process, 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 on-line equal steel time and optimizes the thickness of the intermediate billet, thereby achieving 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, the end cutting treatment is carried out, the finish rolling threading stability is improved, the load distribution of a finish rolling mill is corrected in the finish rolling stage, the roll bending force of the finish rolling mill is forced, the positive tolerance rolling is adopted, the middle wave of the strip steel is avoided, the size precision is improved, and the mechanical property of a finished product is ensured by controlling the finish rolling temperature in the finish rolling stage; the coiling process controls the coiling tension, increases the middle temperature compensation, optimizes the coil unloading time and improves the coil quality.
2. The method for improving the hot rolling stability of the 75Cr1 saw blade steel as claimed in claim 1, wherein the difference of head-to-tail width of the wide billets and the width reduction amount in the feeding process are less than 50 mm.
3. The method for improving the hot rolling stability of the 75Cr1 saw blade steel as claimed in claim 1, wherein the heating process is carried out at a steel temperature of 400 ℃ or higher, a furnace time of 200min or more is not more than 210min, and a tapping temperature is controlled at 1260 +/-20 ℃.
4. The method for improving the hot rolling stability of the 75Cr1 saw blade steel as claimed in claim 1, wherein the accumulated equal steel time of each pass in the rough rolling stage in the hot rolling procedure 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 33-45 mm.
5. The method for improving the hot rolling stability of 75Cr1 saw blade steel as claimed in claim 1, wherein the length of the crop end treatment is controlled to 180-360 mm.
6. The method for improving the hot rolling stability of the 75Cr1 saw blade steel as claimed in claim 1, wherein the load of the finishing mill is modified by: f1: -5% to-6%, F3: -3% to-4%.
7. The method for improving the hot rolling stability of the 75Cr1 saw blade steel according to claim 1, wherein the finished product thickness is rolled with positive tolerance, i.e. contract thickness +0.05mm, on the premise of meeting delivery standards; when the width of the finished product is more than or equal to 1250mm, the F7 roller bending force is forced to be-100 to-400 in the finish rolling stage, so that the generation of middle waves is effectively avoided; the width of the finished product is less than 1250, and the roll bending force of F7 is forced to be +100 to 4000, so that the generation of double-edge waves is effectively avoided.
8. The method for improving the hot rolling stability of 75Cr1 saw blade steel according to claim 1, wherein the temperature setting of the final rolling stage is 880 +/-20 ℃.
9. The method for improving the hot rolling stability of the 75Cr1 saw blade steel as claimed in claim 1, wherein the temperature setting in the coiling process is 680 +/-20 ℃, and the coiling tension is 30-35N/mm2The coiling temperature of the head part is compensated by 20-50 ℃, and the coil is unloaded in the coiling machine after 3-5 minutes so as to reduce the interlayer gap of the finished coil and give proper slow cooling time to the finished coil, thereby being beneficial to preventing flat coil.
10. The method for improving the hot rolling stability of the 75Cr1 saw blade steel as claimed in claim 1, wherein the laminar cooling tail cold length in the laminar cooling process is set to be 5-15 m.
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| CN202210326322.XA CN114700364B (en) | 2022-03-30 | Method for improving hot rolling stability of 75Cr1 saw blade steel |
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| CN202210326322.XA CN114700364B (en) | 2022-03-30 | Method for improving hot rolling stability of 75Cr1 saw blade steel |
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| CN114700364A true CN114700364A (en) | 2022-07-05 |
| CN114700364B CN114700364B (en) | 2024-05-14 |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0937512A1 (en) * | 1998-02-19 | 1999-08-25 | Kvaerner Metals Continuous Casting Limited | Low cost apparatus and method for manufacture of light gauge steel strip |
| 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 of rolling stainless steel coil in 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 |
| US20210317543A1 (en) * | 2018-09-14 | 2021-10-14 | Baoshan Iron & Steel Co., Ltd. | Method for producing ultra-thin hot-rolled strip steel |
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0937512A1 (en) * | 1998-02-19 | 1999-08-25 | Kvaerner Metals Continuous Casting Limited | Low cost apparatus and method for manufacture of light gauge steel strip |
| 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 of rolling stainless steel coil in 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 |
| US20210317543A1 (en) * | 2018-09-14 | 2021-10-14 | Baoshan Iron & Steel Co., Ltd. | Method for producing ultra-thin hot-rolled strip steel |
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