CN114055082A - Production method of high-quality and special-steel precision steel belt for crochet hook - Google Patents
Production method of high-quality and special-steel precision steel belt for crochet hook Download PDFInfo
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- CN114055082A CN114055082A CN202111346661.6A CN202111346661A CN114055082A CN 114055082 A CN114055082 A CN 114055082A CN 202111346661 A CN202111346661 A CN 202111346661A CN 114055082 A CN114055082 A CN 114055082A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 129
- 239000010959 steel Substances 0.000 title claims abstract description 129
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 28
- 238000000137 annealing Methods 0.000 claims abstract description 51
- 238000000034 method Methods 0.000 claims abstract description 50
- 238000005097 cold rolling Methods 0.000 claims abstract description 44
- 230000008569 process Effects 0.000 claims abstract description 44
- 238000004140 cleaning Methods 0.000 claims abstract description 32
- 239000000839 emulsion Substances 0.000 claims abstract description 28
- 238000010008 shearing Methods 0.000 claims abstract description 24
- 239000002994 raw material Substances 0.000 claims abstract description 21
- 238000004806 packaging method and process Methods 0.000 claims abstract description 8
- 238000009966 trimming Methods 0.000 claims abstract description 8
- 238000005096 rolling process Methods 0.000 claims description 53
- 238000001816 cooling Methods 0.000 claims description 39
- 238000010438 heat treatment Methods 0.000 claims description 24
- 238000005238 degreasing Methods 0.000 claims description 18
- 230000002441 reversible effect Effects 0.000 claims description 11
- 238000007599 discharging Methods 0.000 claims description 8
- 238000004321 preservation Methods 0.000 claims description 8
- 230000000630 rising effect Effects 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 7
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 238000004804 winding Methods 0.000 claims description 4
- 230000009286 beneficial effect Effects 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000011229 interlayer Substances 0.000 claims description 3
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 239000003921 oil Substances 0.000 description 27
- 230000000052 comparative effect Effects 0.000 description 4
- 238000009826 distribution Methods 0.000 description 3
- 230000004075 alteration Effects 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
- 229910001562 pearlite Inorganic materials 0.000 description 2
- 238000005554 pickling Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910001315 Tool steel Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 239000010731 rolling oil Substances 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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Abstract
The invention discloses a production method of a high-quality special steel precision steel strip for a crochet hook, which comprises the following steps: the method comprises the following steps: preparing raw materials; step two: longitudinally shearing; step three: cold rolling the secondary emulsion; step four: cleaning for the first time; step five: primary annealing; step six: cold rolling with secondary oil; step seven: secondary cleaning; step eight: trimming; step nine: secondary annealing; step ten: third oil cold rolling; step eleven: leveling oil; step twelve: dividing and shearing; step thirteen: packaging; fourteen steps: and (7) warehousing. The invention has the advantages that the excellent special steel precision steel strip for the crochet hook processed by the production method has small product thickness tolerance, stable performance, no color difference on the surface and good flatness of the appearance plate shape, obviously improves the product quality compared with the process of the prior art, and can meet the high-quality requirement of the crochet hook.
Description
Technical Field
The invention relates to the technical field of steel plate strip production, in particular to a production method of a high-quality special steel precision steel strip for a crochet hook.
Background
At present, the excellent special steel cold-rolled thin steel strip for manufacturing the crochet hook is produced by adopting raw materials (hot rolling and acid pickling rolls) → longitudinal shearing → primary emulsion cold rolling → rewinding → primary common spheroidizing annealing → secondary emulsion cold rolling → primary cleaning → trimming → secondary common spheroidizing annealing → tertiary emulsion cold rolling → secondary cleaning → split shearing → packaging → warehousing, but the excellent special steel cold-rolled thin steel strip for the crochet hook manufactured by adopting the prior art has the defects of large thickness tolerance fluctuation, unstable performance, low spheroidization rate, chromatic aberration on the surface, poor flatness of appearance plate shape and the like, and can not meet the precision requirement of the excellent special steel cold-rolled thin steel strip for the crochet hook.
Disclosure of Invention
The invention aims to solve the problems and designs a production method of a high-quality special steel precision steel strip for a crochet hook.
The technical scheme of the invention is that the production method of the high-quality special steel precision steel strip for the crochet hook comprises the following steps:
the method comprises the following steps: preparing raw materials;
step two: longitudinally shearing;
step three: cold rolling the secondary emulsion;
step four: cleaning for the first time;
step five: primary annealing;
step six: cold rolling with secondary oil;
step seven: secondary cleaning;
step eight: trimming;
step nine: secondary annealing;
step ten: third oil cold rolling;
step eleven: leveling oil;
step twelve: dividing and shearing;
step thirteen: packaging;
fourteen steps: and (7) warehousing.
As a further description of the technical solution, in the step one, the raw materials are selected from: 2.3mm hot-rolled pickled coil steel strip, the composition of which is controlled as follows: 0.8 to 0.9 percent of C, 0.1 to 0.3 percent of Si, 0.1 to 0.5 percent of Mn, less than or equal to 0.03 percent of P, less than or equal to 0.015 percent of S, less than or equal to 0.2 percent of Ni, less than or equal to 0.25 percent of Cr and less than or equal to 0.25 percent of Cu; in the second step, a raw material longitudinal shearing unit is adopted for longitudinally shearing the hot-rolled acid-washed coil raw material, the speed of the unit is controlled to be 80-120m/min, in the third step, the hot-rolled acid-washed coil raw material after longitudinal shearing is subjected to first emulsion cold rolling, the rolling unit is a 850-six-roller reversible emulsion rolling mill, the total deformation amount is 21.7%, and the thickness of 2.3mm is rolled to be 1.8 mm.
As a further description of the technical solution, in the fourth step, a primary cleaning process is performed on the 1.8mm thick steel coil after the primary cold rolling, wherein the concentration of the chemical degreasing solution is 50-70g/l, the concentration of the electrolytic degreasing solution is 40-50g/l, and the electrolytic degreasing current is 10-20A/dm2At the temperature of 55-70 ℃, the unit tension of cleaning and unreeling is 3-4Kg/mm2The winding tension is controlled to be 5-6Kg/mm2The cleaning process can not only improve the interlayer tension of the steel coil by the original recoiling process, avoid the problem of steel sticking after subsequent annealing, but also reduce the emulsion residue on the surface of the steel strip, clean the surface of the steel strip and improve the surface quality of the steel strip.
As a further description of the technical solution, in the fifth step, the steel coil after being cleaned for one time is annealed for the first time, and the first annealing adopts a circulating spheroidizing annealing process, and the process flow is as follows:
a temperature rising stage: heating to 450 ℃ within 4 hours, preserving the heat for 2 hours, and heating to 710 ℃ within 5 hours later;
and (3) a heat preservation stage: keeping the temperature at 710 ℃ for 1 hour, cooling to 690 ℃ within 0.5 hour, keeping the temperature for 1 hour, heating to 710 ℃ within 0.5 hour, taking 3 hours as a cycle, and accumulating for 18 hours in total for 6 cycles;
and (3) a cooling stage: cooling the steel strip with a cover for 4 hours to 550 ℃, then changing the cover to cool the steel strip for 4 hours to 220 ℃, then cooling the steel strip with water to 50 ℃, and discharging the steel strip from the furnace for air cooling.
As a further description of the technical solution, in the sixth step, the steel coil after the first circulation spheroidizing annealing is subjected to the second oil cold rolling, the rolling unit adopts a 650 six-roller reversible oil rolling unit, the total deformation amount of the second rolling is 33.3%, and the steel coil is rolled to have a thickness of 1.8mm to a thickness of 1.2 mm.
As a further description of the technical solution, in the seventh step, the steel coil with the thickness of 1.2mm after the second cold rolling is cleaned for the second time, the concentration of the chemical degreasing solution is 50-70g/l, the concentration of the electrolytic degreasing solution is 40-50g/l, and the electrolytic degreasing current is 10-20A/dm2At the temperature of 55-70 ℃, the unreeling tension is 3-4kg/mm2The rolling tension is 7-8Kg/mm2。
As a further description of the technical solution, in the ninth step, the steel coil after the second cleaning is annealed for the second time, and the second annealing adopts a circulating spheroidizing annealing process, and the process flow is as follows:
a temperature rising stage: heating to 450 ℃ within 4 hours, preserving heat for 2 hours, and heating to 730 ℃ within 5 hours;
and (3) a heat preservation stage: 730, preserving heat for 1 hour, cooling to 700 ℃ in 0.5 hour, preserving heat for 1 hour, heating to 730 ℃ in 0.5 hour, taking 3 hours as a cycle, and accumulating for 18 hours in total for 6 cycles;
and (3) a cooling stage: cooling the steel strip with a cover for 4 hours to 550 ℃, then changing the cover to cool the steel strip for 4 hours to 220 ℃, then cooling the steel strip with water to 50 ℃, and discharging the steel strip from the furnace for air cooling.
As a further description of the technical solution, in the step ten, the coil after the second annealing is subjected to the third oil cold rolling, the rolling unit adopts a 650 six-roller reversible oil rolling unit, the total deformation amount is 31.25%, and the coil is rolled to a thickness of 1.2mm to a thickness of 0.825 mm.
As a further description of the technical solution, in the step ten, in the rolling process, the first two passes adopt 0.2 μm plain-barreled roll rolling, and the last pass adopts an ultra-flat-barreled roll rolling with roughness less than 0.1 μm.
As a further description of the technical solution, in the eleventh step, constant extension control is adopted to significantly improve the flatness of the appearance plate, that is, the constant extension control can be beneficial to improving the stability and uniformity of the thickness tolerance of the product, the leveling total pressure is 100-150 tons, and the constant extension control mode is adopted to control the elongation at 0.8% -1.2%.
The production method has the beneficial effects that the excellent special steel precision steel strip for the crochet hook, which is obtained by processing by adopting the production method, has the advantages of small product thickness tolerance, stable performance, no color difference on the surface, good flatness of the appearance plate shape, remarkably improved product quality compared with the process product in the prior art, and capability of meeting the high-quality requirement of the crochet hook.
Detailed Description
Firstly, explaining the design purpose of the invention, the high-quality special steel cold-rolled thin steel strip for manufacturing the crochet needle at present adopts the raw materials (hot rolling and pickling coil) → longitudinal shearing → first emulsion cold rolling → rewinding → first common spheroidizing annealing → second emulsion cold rolling → first cleaning → trimming → second common spheroidizing annealing → third emulsion cold rolling → second cleaning → dividing shearing → packaging → warehousing. However, the high-quality special steel cold-rolled thin steel strip for the crochet hook manufactured by the prior art has the defects of large thickness tolerance fluctuation, unstable performance, low spheroidization rate, chromatic aberration on the surface, poor flatness of appearance plate shape and the like, and can not meet the precision requirement of the high-quality special steel cold-rolled thin steel strip for the crochet hook. Therefore, the invention designs a production method of the high-quality special steel precision steel strip for the crochet hook.
The invention will be described in detail below, a method for producing a precision steel strip of high-quality special steel for a crochet hook, which will be described in detail by the comparative examples and the embodiment: the method comprises the following steps:
the method comprises the following steps: preparing raw materials;
step two: longitudinally shearing;
step three: cold rolling the secondary emulsion;
step four: cleaning for the first time;
step five: primary annealing;
step six: cold rolling with secondary oil;
step seven: secondary cleaning;
step eight: trimming;
step nine: secondary annealing;
step ten: third oil cold rolling;
step eleven: leveling oil;
step twelve: dividing and shearing;
step thirteen: packaging;
fourteen steps: and (7) warehousing.
Comparative example:
raw materials (hot-rolled and acid-washed coil) → longitudinal shearing → primary emulsion cold rolling → rewinding → primary ordinary spheroidizing annealing → secondary emulsion cold rolling → primary cleaning → trimming → secondary ordinary spheroidizing annealing → tertiary emulsion cold rolling → secondary cleaning → split shearing → packaging → warehousing.
Example (b):
raw materials (hot-rolled and acid-pickled coils) → longitudinal shearing → primary emulsion cold rolling → primary cleaning → primary circulation spheroidizing annealing → secondary oil cold rolling → secondary cleaning → trimming → secondary circulation spheroidizing annealing → tertiary oil cold rolling → oil leveling → split shearing → packaging → warehousing.
In the first step, the raw material is selected from 2.3mm hot-rolled pickled steel strip, and the chemical components are controlled as follows: 0.8 to 0.9 percent of C, 0.1 to 0.3 percent of Si, 0.1 to 0.5 percent of Mn, less than or equal to 0.03 percent of P, less than or equal to 0.015 percent of S, less than or equal to 0.2 percent of Ni, less than or equal to 0.25 percent of Cr and less than or equal to 0.25 percent of Cu;
in the second step, the hot-rolled acid-washed coil raw material is longitudinally sheared by a raw material longitudinal shearing unit, and the speed of the unit is controlled to be 80-120 m/min;
in the third step, the hot-rolled acid-washed coil raw material after longitudinal shearing is subjected to first emulsion cold rolling, the rolling unit is a 850-six-roller reversible emulsion rolling mill, the total deformation is 21.7%, and the thickness of 2.3mm is rolled to be 1.8 mm;
and a process of cleaning the steel coil with the thickness of 1.8mm after the first cold rolling is added to replace the original recoiling process.
In the fourth step, the concentration of the chemical degreasing solution is 50-70g/l, the concentration of the electrolytic degreasing solution is 40-50g/l, and the electrolytic degreasing current is 10-20A/dm2At the temperature of 55-70 ℃, the unit tension of cleaning and unreeling is 3-4Kg/mm2The winding tension is controlled to be 5-6Kg/mm2The cleaning process can not only achieve the effects of improving the interlayer tension of the steel coil and avoiding the problems of steel sticking and the like after subsequent annealing in the original recoiling process, but also reduce the emulsion residue on the surface of the steel strip, clean the surface of the steel strip and improve the surface quality of the steel strip;
and in the fifth step, carrying out primary annealing on the steel coil subjected to primary cleaning, wherein the primary annealing adopts a circulating spheroidizing annealing process to replace the prior common spheroidizing annealing process.
The original common spheroidizing annealing process comprises the following steps:
a temperature rising stage: heating to 450 ℃ within 4 hours, preserving the heat for 2 hours, and heating to 710 ℃ within 5 hours later; and (3) a heat preservation stage: keeping the temperature at 710 ℃ for 18 hours; and (3) a cooling stage: cooling the steel strip with a cover for 4 hours to 550 ℃, then changing the cover to cool the steel strip for 4 hours to 220 ℃, then cooling the steel strip with water to 50 ℃, and discharging the steel strip from the furnace for air cooling.
The cyclic spheroidizing annealing process comprises the following steps:
a temperature rising stage: heating to 450 ℃ within 4 hours, preserving the heat for 2 hours, and heating to 710 ℃ within 5 hours later;
and (3) a heat preservation stage: 710 preserving heat for 1 hour, cooling to 690 ℃ in 0.5 hour, preserving heat for 1 hour, heating to 710 ℃ in 0.5 hour, taking 3 hours as a cycle, and accumulating for 18 hours in total for 6 cycles;
and (3) a cooling stage: cooling the steel strip with a cover for 4 hours to 550 ℃, then changing the cover to cool the steel strip for 4 hours to 220 ℃, then cooling the steel strip with water to 50 ℃, and discharging the steel strip from the furnace for air cooling.
In the sixth step, the steel coil subjected to the first circulation spheroidizing annealing is subjected to second oil cold rolling, the rolling mill set is changed from the previous 850 six-roller reversible emulsion rolling mill set to the 650 six-roller reversible oil rolling mill set, because the steel strip rolled by the oil rolling mill set can obtain better surface quality, however, the 650 oil rolling mill has a poor cooling effect and a lower rated rolling force compared with the 850 emulsion rolling mill, a rolling flow needs to be set specifically, the total deformation of the second rolling is 33.3%, the steel strip is rolled to a thickness of 1.8mm to a thickness of 1.2mm, and the pass distribution is compared as follows:
in the seventh step, the steel coil with the thickness of 1.2mm after the second cold rolling is cleaned for the second time, the concentration of the chemical degreasing solution is 50-70g/l, the concentration of the electrolytic degreasing solution is 40-50g/l, and the electrolytic degreasing current is 10-20A/dm2At the temperature of 55-70 ℃, the unreeling tension is 3-4kg/mm2The rolling tension is 7-8Kg/mm2；
And step nine, carrying out secondary annealing on the steel coil subjected to secondary cleaning, wherein the secondary annealing adopts a circulating spheroidizing annealing process to replace the previous common spheroidizing annealing process.
The original common spheroidizing annealing process comprises the following steps:
a temperature rising stage: heating to 450 ℃ within 4 hours, preserving heat for 2 hours, and heating to 730 ℃ within 5 hours; and (3) a heat preservation stage: preserving the heat at 730 ℃ for 18 hours; and (3) a cooling stage: cooling the steel strip with a cover for 4 hours to 550 ℃, then changing the cover to cool the steel strip for 4 hours to 220 ℃, then cooling the steel strip with water to 50 ℃, and discharging the steel strip from the furnace for air cooling.
And (3) evaluating a metallographic structure: the spheroidization grade is 2-3 (refer to the standard GB/T1299-2000), and the spheroidization rate reaches more than 90 percent.
The cyclic spheroidizing annealing process comprises the following steps:
a temperature rising stage: heating to 450 ℃ within 4 hours, preserving heat for 2 hours, and heating to 730 ℃ within 5 hours; and (3) a heat preservation stage: 730 for 1 hour, 0.5 hour, cooling to 700 ℃, keeping the temperature for 1 hour, then 0.5 hour, heating to 730 ℃, and taking 3 hours as a cycle. 6 cycles in total, totalizing 18 hours; and (3) a cooling stage: cooling the steel strip with a cover for 4 hours to 550 ℃, then changing the cover to cool the steel strip for 4 hours to 220 ℃, then cooling the steel strip with water to 50 ℃, and discharging the steel strip from the furnace for air cooling.
And (3) evaluating a metallographic structure: the spheroidization rate reaches over 95 percent in grade 3 (refer to the standard GB/T1299-2000).
In the tenth step, the steel coil after the second annealing is subjected to third oil cold rolling, the rolling unit is changed from the previous 850 six-roller reversible emulsion rolling unit to a 650 six-roller reversible oil rolling unit, the total deformation is 31.25%, and the steel coil is rolled to the thickness of 0.825mm from the thickness of 1.2 mm. The pass distribution is compared as follows:
in the third oil rolling process, the working roll is replaced by the common smooth roll rolling with the roughness less than 0.2 μm of the previous comparative example, the common smooth roll rolling with the roughness less than 0.2 μm of the previous two passes is used for rolling, and the super smooth roll rolling with the roughness less than 0.1 μm of the last pass is used for rolling.
And adding an oil leveling process to the steel coil subjected to the three-time cold rolling to replace the third cleaning of the comparative example, wherein the rolling oil used by the oil rolling mill and the oil leveling unit is the same, so that the products can be directly butted, and the cleaning link is omitted. The oil leveling process is added on the basis of the existing production process, and constant extension control is adopted, so that the flatness of the appearance plate type is obviously improved, namely the constant extension control can be favorable for improving the stability and the uniformity of the thickness tolerance of the product.
Leveling the total pressure of 100-150 tons, adopting a constant extension control mode, controlling the extension rate to be 0.8-1.2%,
the product prepared by the process has the technical indexes of the finished product
(1) Thickness deviation: 0.825 + -0.005 m;
(2) hardness (HV 0.5): 250-270;
(3) apparent plate flatness (camber): less than or equal to 2mm/10 m;
(4) surface: the color is bright and clean, and has no color difference;
(5) the organization spheroidization grade is grade 3.
Annealing process: in order to ensure the stability of the performance, the annealing process is also crucial except that the content of key elements of the material is optimally controlled, the raw material used in the invention is alloy carbon tool steel of SK5 brand, the subsequent heat treatment processes such as quenching and tempering and the like can be carried out in the production process, and the comprehensive performance of the product after heat treatment can be greatly determined by the performance of the steel strip structure; therefore, the reasonable spheroidizing annealing of the steel strip in the cold rolling process is very important; the spheroidizing annealing process of each rolling process is researched and optimized, the original common spheroidizing annealing process is replaced by the circulating spheroidizing annealing process, the structure of the spherical pearlite obtained by the method is grade 3 (refer to the standard GB/T1299-2000), the spheroidizing rate reaches more than 95 percent, and the stability of the performance of the steel strip is obviously improved; the spheroidization rate of the spherical pearlite structure obtained by adopting the traditional isothermal annealing spheroidization process is relatively low, about 90 percent, the structure stability is slightly poor, and the spheroidization grade is grade 2-3.
The cold rolling process comprises the following steps: in order to ensure the stability of thickness size precision, the cold rolling total deformation, pass deformation and rolling passes are researched and optimized, particularly the design of the final rolling pass total deformation control, the rolling pass distribution and the winding and unwinding tension is combined with the application of a hydraulic AGC thickness automatic control system to control the cold rolling process, so that the thickness precision and the steel strip plate type quality are obviously improved. Compared with an emulsion rolling mill, the product produced by the oil rolling mill has better surface quality. In the rolling process, the final pass adopts a super smooth roller for rolling, the roughness of the roller surface is less than 0.1 mu m, the extremely high surface quality can be obtained, the surface of the product is bright and clean, and the roughness is less than 0.1 mu m. The former rolling process adopts emulsion rolling, the roller adopts a common smooth roller with the roughness of about 0.2 mu m, and the roughness of the rolled plate surface is between 0.1 and 0.2 mu m.
Oil leveling process: an oil leveling process is added on the basis of the existing production process, and constant extension control is adopted, so that the flatness of the appearance plate shape is obviously improved.
By adopting the production method, the processed excellent special steel precision steel strip for the crochet hook has the advantages of small product thickness tolerance, stable performance, no surface color difference and good flatness of the appearance plate shape, obviously improves the product quality compared with the process in the prior art, and can meet the high-quality requirement of the crochet hook.
The technical solutions described above only represent the preferred technical solutions of the present invention, and some possible modifications to some parts of the technical solutions by those skilled in the art all represent the principles of the present invention, and fall within the protection scope of the present invention.
Claims (10)
1. A production method of a high-quality special steel precision steel strip for a crochet hook is characterized by comprising the following steps:
the method comprises the following steps: preparing raw materials;
step two: longitudinally shearing;
step three: cold rolling the secondary emulsion;
step four: cleaning for the first time;
step five: primary annealing;
step six: cold rolling with secondary oil;
step seven: secondary cleaning;
step eight: trimming;
step nine: secondary annealing;
step ten: third oil cold rolling;
step eleven: leveling oil;
step twelve: dividing and shearing;
step thirteen: packaging;
fourteen steps: and (7) warehousing.
2. The method for producing the fine special steel precision steel strip for the crochet hook according to the claim 1, characterized in that, in the step one, the raw materials are selected from the following materials: 2.3mm hot-rolled pickled coil steel strip, the composition of which is controlled as follows: 0.8 to 0.9 percent of C, 0.1 to 0.3 percent of Si, 0.1 to 0.5 percent of Mn, less than or equal to 0.03 percent of P, less than or equal to 0.015 percent of S, less than or equal to 0.2 percent of Ni, less than or equal to 0.25 percent of Cr and less than or equal to 0.25 percent of Cu; in the second step, a raw material longitudinal shearing unit is adopted for longitudinally shearing the hot-rolled acid-washed coil raw material, the speed of the unit is controlled to be 80-120m/min, in the third step, the hot-rolled acid-washed coil raw material after longitudinal shearing is subjected to first emulsion cold rolling, the rolling unit is a 850-six-roller reversible emulsion rolling mill, the total deformation amount is 21.7%, and the thickness of 2.3mm is rolled to be 1.8 mm.
3. The method for producing a fine and special steel precision steel strip for a crochet hook according to claim 2, characterized in that in the fourth step, a 1.8mm thick steel coil after the first cold rolling is subjected to a primary cleaning process, the concentration of the chemical degreasing solution is 50-70g/l, the concentration of the electrolytic degreasing solution is 40-50g/l, and the electrolytic degreasing current is 10-20A/dm2At the temperature of 55-70 ℃, the unit tension of cleaning and unreeling is 3-4Kg/mm2The winding tension is controlled to be 5-6Kg/mm2The cleaning process can not only improve the interlayer tension of the steel coil by the original recoiling process, avoid the problem of steel sticking after subsequent annealing, but also reduce the emulsion residue on the surface of the steel strip, clean the surface of the steel strip and improve the surface quality of the steel strip.
4. The method for producing the high-quality and special-steel precision steel strip for the crochet hook according to the claim 3, characterized in that in the fifth step, the steel coil after being cleaned for one time is annealed for the first time, the first annealing adopts a circulating spheroidizing annealing process, and the technological process is as follows:
a temperature rising stage: heating to 450 ℃ within 4 hours, preserving the heat for 2 hours, and heating to 710 ℃ within 5 hours later;
and (3) a heat preservation stage: keeping the temperature at 710 ℃ for 1 hour, cooling to 690 ℃ within 0.5 hour, keeping the temperature for 1 hour, heating to 710 ℃ within 0.5 hour, taking 3 hours as a cycle, and accumulating for 18 hours in total for 6 cycles;
and (3) a cooling stage: cooling the steel strip with a cover for 4 hours to 550 ℃, then changing the cover to cool the steel strip for 4 hours to 220 ℃, then cooling the steel strip with water to 50 ℃, and discharging the steel strip from the furnace for air cooling.
5. The method for producing the high-quality and special-steel precision steel strip for the crochet hook according to the claim 4, characterized in that in the sixth step, the steel coil after the first circulation spheroidizing annealing is subjected to the second oil cold rolling, a 650-six roller reversible oil rolling unit is adopted, the total deformation amount of the second rolling is 33.3%, and the steel coil is rolled to the thickness of 1.8mm to the thickness of 1.2 mm.
6. The method for producing a fine and special steel precision steel strip for a crochet hook according to claim 5, characterized in that in the seventh step, the steel coil with the thickness of 1.2mm after the second cold rolling is subjected to the second cleaning, the concentration of the chemical degreasing solution is 50-70g/l, the concentration of the electrolytic degreasing solution is 40-50g/l, and the electrolytic degreasing current is 10-20A/dm2At the temperature of 55-70 ℃, the unreeling tension is 3-4kg/mm2The rolling tension is 7-8Kg/mm2。
7. The method for producing the high-quality and special-steel precision steel strip for the crochet hook according to claim 6, characterized in that in the ninth step, the steel coil after the second cleaning is annealed for the second time, and the second annealing adopts a circulating spheroidizing annealing process, and the technological process is as follows:
a temperature rising stage: heating to 450 ℃ within 4 hours, preserving heat for 2 hours, and heating to 730 ℃ within 5 hours;
and (3) a heat preservation stage: 730, preserving heat for 1 hour, cooling to 700 ℃ in 0.5 hour, preserving heat for 1 hour, heating to 730 ℃ in 0.5 hour, taking 3 hours as a cycle, and accumulating for 18 hours in total for 6 cycles;
and (3) a cooling stage: cooling the steel strip with a cover for 4 hours to 550 ℃, then changing the cover to cool the steel strip for 4 hours to 220 ℃, then cooling the steel strip with water to 50 ℃, and discharging the steel strip from the furnace for air cooling.
8. The method for producing the high-quality and high-precision steel strip for the crochet hook according to the claim 1, characterized in that in the tenth step, the second annealed steel coil is subjected to the third oil cold rolling, a 650-six roller reversible oil rolling unit is adopted as a rolling unit, the total deformation is 31.25%, and the thickness of 1.2mm is rolled to be 0.825 mm.
9. The method for producing the precision steel strip for the crochet needles as claimed in claim 8, wherein in the step ten, the first two passes of the rolling process adopt 0.2 μm plain-barreled roll rolling, and the last pass adopts ultra-barreled roll rolling with roughness less than 0.1 μm.
10. The method for producing the high-quality and high-precision steel strip for the crochet hook as claimed in claim 1, wherein in the step eleven, the constant elongation control is adopted to significantly improve the flatness of the appearance plate, namely the constant elongation control can be beneficial to improving the stability and uniformity of the thickness tolerance of the product, the leveling total pressure is 100 tons, and the constant elongation control is adopted to control the elongation at 0.8% -1.2%.
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