CN114055082B - Production method of high-grade special steel precision steel strip for crochet hook - Google Patents
Production method of high-grade special steel precision steel strip for crochet hook Download PDFInfo
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- CN114055082B CN114055082B CN202111346661.6A CN202111346661A CN114055082B CN 114055082 B CN114055082 B CN 114055082B CN 202111346661 A CN202111346661 A CN 202111346661A CN 114055082 B CN114055082 B CN 114055082B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 81
- 239000010959 steel Substances 0.000 title claims abstract description 81
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- 238000000137 annealing Methods 0.000 claims abstract description 50
- 238000000034 method Methods 0.000 claims abstract description 48
- 238000005097 cold rolling Methods 0.000 claims abstract description 44
- 238000004140 cleaning Methods 0.000 claims abstract description 32
- 239000000839 emulsion Substances 0.000 claims abstract description 27
- 239000002994 raw material Substances 0.000 claims abstract description 21
- 238000010008 shearing Methods 0.000 claims abstract description 13
- 238000004806 packaging method and process Methods 0.000 claims abstract description 8
- 238000009966 trimming Methods 0.000 claims abstract description 8
- 238000005520 cutting process Methods 0.000 claims abstract description 4
- 238000001816 cooling Methods 0.000 claims description 41
- 238000005096 rolling process Methods 0.000 claims description 40
- 238000010438 heat treatment Methods 0.000 claims description 25
- 238000005238 degreasing Methods 0.000 claims description 18
- 239000012530 fluid Substances 0.000 claims description 12
- 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
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 7
- 238000004804 winding Methods 0.000 claims description 7
- 230000004075 alteration Effects 0.000 abstract description 6
- 239000003921 oil Substances 0.000 description 27
- 230000000052 comparative effect Effects 0.000 description 4
- 238000005554 pickling Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000010960 cold rolled steel Substances 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 229910001562 pearlite Inorganic materials 0.000 description 2
- 239000010731 rolling oil Substances 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
- 238000009825 accumulation Methods 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 238000005406 washing 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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- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
The invention discloses a production method of a high-grade special steel precision steel belt for a crochet hook, which comprises the following steps: step one: preparing raw materials; step two: cutting longitudinally; step three: cold rolling the secondary emulsion; step four: primary cleaning; step five: primary annealing; step six: cold rolling with secondary oil; step seven: secondary cleaning; step eight: trimming; step nine: secondary annealing; step ten: oil cold rolling for three times; step eleven: leveling oil; step twelve: shearing; step thirteen: packaging; step fourteen: and (5) warehousing. The method has the advantages that the manufactured high-grade special steel precision steel strip for the crochet hook has small thickness tolerance, stable performance, no chromatic aberration on the surface and good flatness of the appearance plate, the quality of the manufactured high-grade special steel strip for the crochet hook is obviously improved compared with the process product in the prior art, and the high-quality requirement of crochet hook use can be met.
Description
Technical Field
The invention relates to the technical field of steel plate strip production, in particular to a production method of a precision steel strip of high-grade special steel for crochet hooks.
Background
At present, raw materials (hot-rolled acid-washed coil), 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, shearing, packaging and warehousing are all adopted for producing the high-grade special steel cold-rolled thin steel strip for the crochet hook, but the high-grade special steel cold-rolled thin steel strip for the crochet hook, which is manufactured by adopting the prior art, has the defects of large thickness tolerance fluctuation, unstable performance, low spheroidizing rate, chromatic aberration on the surface, poor flatness of appearance plate shape and the like, and cannot meet the precision requirement of the high-grade 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-grade special steel precision steel strip for a crochet hook.
The technical scheme for achieving the purpose is that the production method of the high-grade special steel precision steel strip for the crochet hook comprises the following steps of:
step one: preparing raw materials;
step two: cutting longitudinally;
step three: cold rolling the secondary emulsion;
step four: primary cleaning;
step five: primary annealing;
step six: cold rolling with secondary oil;
step seven: secondary cleaning;
step eight: trimming;
step nine: secondary annealing;
step ten: oil cold rolling for three times;
step eleven: leveling oil;
step twelve: shearing;
step thirteen: packaging;
step fourteen: and (5) warehousing.
As a further description of the technical scheme, in the first step, raw materials are selected: 2.3mm hot rolled pickled coil steel strip, the components of which are controlled as follows: 0.8-0.9% of C, 0.1-0.3% of Si, 0.1-0.5% of Mn, less than or equal to 0.03% of P, less than or equal to 0.015% of S, less than or equal to 0.2% of Ni, less than or equal to 0.25% of Cr and less than or equal to 0.25% of Cu; in the second step, a raw material slitting machine set is adopted for slitting the hot-rolled pickled coil raw material, the speed of the machine set is controlled to be 80-120m/min, in the third step, the first emulsion cold rolling is carried out on the hot-rolled pickled coil raw material subjected to slitting, the rolling machine set is a 850 six-roller reversible emulsion mill, the total deformation is 21.7%, and the thickness of 2.3mm is rolled to be 1.8 mm.
As a further description of the technical scheme, in the fourth step, the steel coil with the thickness of 1.8mm after the first cold rolling is subjected to a primary cleaning process, wherein the concentration of the chemical degreasing fluid is 50-70g/l, the concentration of the electrolytic degreasing fluid is 40-50g/l, and the electrolytic degreasing current is 10-20A/dm 2 The temperature is 55-70 ℃, and the unit tension of cleaning and unreeling is 3-4Kg/mm 2 The winding tension is controlled to be 5-6Kg/mm 2 The cleaning process not only can achieve the original rewinding process to improve the interlayer tension of the steel coil and avoid the problem of steel sticking after subsequent annealing, but also can reduce the emulsion residue on the surface of the steel belt, clean the surface of the steel belt and improve the surface quality of the steel belt.
As a further description of the technical scheme, in the fifth step, the steel coil after primary cleaning is annealed for the first time, and the first annealing adopts a circulating spheroidizing annealing process, and the technical process is as follows:
and (3) heating: heating to 450 ℃ for 4 hours, preserving heat for 2 hours, and heating to 710 ℃ for 5 hours;
and (3) heat preservation: preserving heat at 710 ℃ for 1 hour, reducing the temperature to 690 ℃ for 0.5 hour, preserving heat for 1 hour, and raising the temperature to 710 ℃ for 0.5 hour, wherein the 3 hours are taken as one cycle, 6 cycles are added, and 18 hours are accumulated;
and (3) a cooling stage: cooling the steel plate with a cover for 4 hours to 550 ℃, then changing the cover for air cooling for 4 hours to 220 ℃, then water cooling to 50 ℃, and discharging and air cooling.
As a further description of the technical scheme, in the step six, the steel coil after the first circulating spheroidizing annealing is subjected to the second oil cold rolling, a 650 six-roller reversible oil rolling unit is adopted as a rolling unit, the total deformation of the second rolling is 33.3%, and the thickness of 1.8mm is rolled to the thickness of 1.2 mm.
As a further description of the technical scheme, in the step seven, 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 fluid is 50-70g/l, the concentration of the electrolytic degreasing fluid is 40-50g/l, and the electrolytic degreasing current is 10-20A/dm 2 The temperature is 55-70 ℃, and the unreeling tension is 3-4kg/mm 2 Winding tension of 7-8Kg/mm 2 。
As a further description of the technical scheme, in the step nine, 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 technical process is as follows:
and (3) heating: heating to 450 ℃ for 4 hours, preserving heat for 2 hours, and heating to 730 ℃ for 5 hours;
and (3) heat preservation: preserving heat at 730 ℃ for 1 hour, reducing the temperature to 700 ℃ for 0.5 hour, preserving heat for 1 hour, and raising the temperature to 730 ℃ for 0.5 hour, wherein 3 hours are taken as one cycle, 6 cycles are taken as a whole, and 18 hours are accumulated;
and (3) a cooling stage: cooling the steel plate with a cover for 4 hours to 550 ℃, then changing the cover for air cooling for 4 hours to 220 ℃, then water cooling to 50 ℃, and discharging and air cooling.
As a further description of the technical scheme, in the step ten, the steel coil after the second annealing is subjected to the third oil cold rolling, and the rolling unit adopts a 650 six-roller reversible oil rolling mill set, the total deformation is 31.25%, and the thickness of 1.2mm is rolled to the thickness of 0.825 mm.
As a further description of the technical scheme, in the step ten, during the rolling process, the first two passes are rolled by using a 0.2 μm plain roller, and the last pass is rolled by using a super-plain roller with roughness less than 0.1 μm.
As further description of the technical scheme, in the step eleven, constant extension control is adopted to obviously improve the flatness of the appearance plate, namely, the constant extension control can be beneficial to improving the stability and uniformity of the thickness tolerance of the product, the total pressure is leveled to be 100-150 tons, and the constant extension control mode is adopted to control the extensibility to be 0.8% -1.2%.
The method has the advantages that the manufactured high-grade special steel precision steel strip for the crochet hook has small thickness tolerance, stable performance, no chromatic aberration on the surface and good flatness of the appearance plate, and compared with the process product in the prior art, the method has the advantages that the quality of the manufactured high-grade special steel precision steel strip for the crochet hook is remarkably improved, and the high-quality requirement of crochet hook use can be met.
Detailed Description
Firstly, the design purpose of the invention is explained, and the prior production of the excellent steel cold-rolled thin steel strip for manufacturing the crochet hook adopts raw materials (hot-rolled pickling coil), 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, shearing, packaging and warehousing. However, the cold-rolled 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 the appearance plate shape and the like, and cannot meet the precision requirement of the cold-rolled steel strip for the crochet hook. Therefore, the invention designs a production method of the high-grade special steel precision steel strip for the crochet hook.
The invention will be described in detail below, which is a method for producing precision steel strip of excellent steel for crochet hook, and the technical scheme is described in detail by comparative examples and examples: the method comprises the following steps:
step one: preparing raw materials;
step two: cutting longitudinally;
step three: cold rolling the secondary emulsion;
step four: primary cleaning;
step five: primary annealing;
step six: cold rolling with secondary oil;
step seven: secondary cleaning;
step eight: trimming;
step nine: secondary annealing;
step ten: oil cold rolling for three times;
step eleven: leveling oil;
step twelve: shearing;
step thirteen: packaging;
step fourteen: and (5) warehousing.
Comparative example:
raw material (hot-rolled pickled coil), 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, shearing, packaging and warehousing.
Examples:
raw material (hot rolling pickling coil), 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, shearing, packaging and warehousing.
In the first step, the raw materials are selected from hot-rolled pickled coiled steel strips with the thickness of 2.3mm, and the chemical components are controlled as follows: 0.8-0.9% of C, 0.1-0.3% of Si, 0.1-0.5% of Mn, less than or equal to 0.03% of P, less than or equal to 0.015% of S, less than or equal to 0.2% of Ni, less than or equal to 0.25% of Cr and less than or equal to 0.25% of Cu;
in the second step, a raw material slitting machine set is adopted for slitting the hot-rolled pickling coil raw material, and the speed of the machine set is controlled to be 80-120m/min;
in the third step, performing first emulsion cold rolling on the hot-rolled pickled coil raw material subjected to longitudinal shearing, wherein a 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 1.8 mm;
and a primary cleaning process is added to the steel coil with the thickness of 1.8mm after the primary cold rolling, so that the original rewinding process is replaced.
In the fourth step, the concentration of the chemical degreasing fluid is 50-70g/l, the concentration of the electrolytic degreasing fluid is 40-50g/l, and the electrolytic degreasing current is 10-20A/dm 2 The temperature is 55-70deg.C, and the heat is removedThe unit tension of the washing and unreeling is 3-4Kg/mm 2 The winding tension is controlled to be 5-6Kg/mm 2 The cleaning process not only can achieve the effects of improving the interlayer tension of the steel coil by the original rewinding process and avoiding the problems of steel sticking and the like after subsequent annealing, but also can reduce the emulsion residue on the surface of the steel belt, clean the surface of the steel belt and improve the surface quality of the steel belt;
in the fifth step, the steel coil after primary cleaning is annealed for the first time, and the first annealing adopts a circulating spheroidizing annealing process to replace the prior ordinary spheroidizing annealing process.
The original common spheroidizing annealing process is as follows:
and (3) heating: heating to 450 ℃ for 4 hours, preserving heat for 2 hours, and heating to 710 ℃ for 5 hours; and (3) heat preservation: preserving heat at 710 ℃ for 18 hours; and (3) a cooling stage: cooling the steel plate with a cover for 4 hours to 550 ℃, then changing the cover for air cooling for 4 hours to 220 ℃, then water cooling to 50 ℃, and discharging and air cooling.
The cyclic spheroidizing annealing process is as follows:
and (3) heating: heating to 450 ℃ for 4 hours, preserving heat for 2 hours, and heating to 710 ℃ for 5 hours;
and (3) heat preservation: preserving heat for 1 hour at 710, reducing the temperature to 690 ℃ for 0.5 hour, preserving heat for 1 hour, and raising the temperature to 710 ℃ for 0.5 hour, wherein the 3 hours are taken as one cycle, 6 cycles are added, and 18 hours are accumulated;
and (3) a cooling stage: cooling the steel plate with a cover for 4 hours to 550 ℃, then changing the cover for air cooling for 4 hours to 220 ℃, then water cooling to 50 ℃, and discharging and air cooling.
In the sixth step, the steel coil after the first circulation ball annealing is subjected to the second oil cold rolling, the rolling unit is changed from the previous 850 six-roller reversible emulsion rolling unit into a 650 six-roller reversible oil rolling unit, and because the steel strip rolled by the oil rolling unit can obtain better surface quality, but compared with the 850 emulsion rolling unit, the 650 oil rolling unit has poorer cooling effect and lower rated rolling force, therefore, the rolling flow is required to be set in a targeted way, the total deformation amount of the second rolling is 33.3 percent, the thickness of 1.8mm is rolled to the 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 fluid is 50-70g/l, the concentration of the electrolytic degreasing fluid is 40-50g/l, and the electrolytic degreasing current is 10-20A/dm 2 The temperature is 55-70 ℃, and the unreeling tension is 3-4kg/mm 2 Winding tension of 7-8Kg/mm 2 ；
And in the step nine, carrying out secondary annealing on the steel coil after the secondary cleaning, wherein the secondary annealing adopts a circulating spheroidizing annealing process to replace the prior ordinary spheroidizing annealing process.
The original common spheroidizing annealing process is as follows:
and (3) heating: heating to 450 ℃ for 4 hours, preserving heat for 2 hours, and heating to 730 ℃ for 5 hours; and (3) heat preservation: preserving heat at 730 ℃ for 18 hours; and (3) a cooling stage: cooling the steel plate with a cover for 4 hours to 550 ℃, then changing the cover for air cooling for 4 hours to 220 ℃, then water cooling to 50 ℃, and discharging and air cooling.
Metallographic structure assessment: spheroidization grade 2-3 (refer to standard GB/T1299-2000), and spheroidization rate reaches more than 90%.
The cyclic spheroidizing annealing process is as follows:
and (3) heating: heating to 450 ℃ for 4 hours, preserving heat for 2 hours, and heating to 730 ℃ for 5 hours; and (3) heat preservation: the temperature is kept at 730 ℃ for 1 hour, the temperature is reduced to 700 ℃ for 0.5 hour, the temperature is kept for 1 hour, the temperature is increased to 730 ℃ for 0.5 hour, and 3 hours are taken as one cycle. 6 cycles total, 18 hours of accumulation; and (3) a cooling stage: cooling the steel plate with a cover for 4 hours to 550 ℃, then changing the cover for air cooling for 4 hours to 220 ℃, then water cooling to 50 ℃, and discharging and air cooling.
Metallographic structure assessment: grade 3 (refer to standard GB/T1299-2000) of spheroidization grade, the spheroidization rate reaches more than 95%.
In the step ten, the steel coil after the second annealing is subjected to the third oil cold rolling, the rolling unit is changed from the previous 850 six-roller reversible emulsion rolling unit into a 650 six-roller reversible oil rolling unit, the total deformation is 31.25%, and the thickness of 1.2mm is rolled to the thickness of 0.825 mm. The pass allocation is compared as follows:
in the third oil rolling process, the working roll is changed from the common smooth roll rolling with the roughness less than 0.2 mu m of the previous comparative example to the common smooth roll rolling with the roughness less than 0.2 mu m of the previous two passes, and finally the super smooth roll rolling with the roughness less than 0.1 mu m of the pass is adopted.
And the oil leveling process is added to the steel coil subjected to the three times of cold rolling to replace the third cleaning of the comparative example, and the products can be directly butted due to the fact that rolling oil used by an oil rolling mill and the rolling oil used by an oil leveling unit are the same, so that a cleaning link is omitted. The novel 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 beneficial to improving the stability and uniformity of the thickness tolerance of the product.
The total pressure is leveled to be 100-150 tons, the constant extension control mode is adopted, the extension rate is controlled to be 0.8-1.2 percent,
the product manufactured by the process has technical indexes of finished products
(1) Thickness deviation: 0.825 + -0.005 m;
(2) Hardness (HV 0.5): 250-270;
(3) Appearance plate flatness (camber): less than or equal to 2mm/10m;
(4) The surface: bright and clean, and no chromatic aberration;
(5) The tissue spheroidization grade is grade 3.
And (3) annealing: in order to ensure the stability of the performance, besides the optimal control of the content of key elements of the material, the annealing process is also critical, the raw material used in the invention is SK5 brand alloy carbon tool steel, the subsequent heat treatment processes such as quenching and tempering can be carried out in the production process, and the performance of the steel strip structure can determine the comprehensive performance of the heat treated product to a great extent; therefore, reasonable spheroidizing annealing of the steel strip in the cold rolling process is important; the invention researches and optimizes the spheroidizing annealing process of each rolling process, replaces the original common spheroidizing annealing process by adopting a circulating spheroidizing annealing process, and the spheroidized pearlite structure obtained by the method is grade 3, (refer to standard GB/T1299-2000), and the spheroidizing rate reaches more than 95 percent, so that 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, only about 90%, the structure stability is slightly poor, and the spheroidization grade is 2-3 grade.
The cold rolling process comprises the following steps: in order to ensure the stability of thickness dimension precision, the total deformation of cold rolling, the pass deformation and the rolling pass are researched and optimized, and particularly, the total deformation of the last rolling pass, the distribution of the rolling pass and the design of winding and unwinding tension are designed, and the cold rolling process is controlled by combining the application of a hydraulic AGC thickness automatic control system, so that the thickness precision and the steel strip plate type quality are obviously improved. The product is produced by using an oil mill, and has better surface quality compared with an emulsion mill. In the rolling process, a super-smooth roller is selected for rolling in the final pass, 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 prior 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.
The oil leveling process comprises the following steps: the novel 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.
The high-quality precision steel strip for the crochet hook, which is processed by adopting the production method, has the advantages of small thickness tolerance, stable performance, no chromatic aberration on the surface, good flatness of the appearance plate, and remarkably improved quality compared with the process product in the prior art, and can meet the high-quality requirement of crochet hook use.
The above technical solution only represents the preferred technical solution of the present invention, and some changes that may be made by those skilled in the art to some parts of the technical solution represent the principles of the present invention, and the technical solution falls within the scope of the present invention.
Claims (4)
1. The production method of the high-grade special steel precision steel belt for the crochet hook is characterized by comprising the following steps of:
step one: preparing raw materials;
step two: cutting longitudinally;
step three: cold rolling primary emulsion;
step four: primary cleaning;
step five: primary annealing;
step six: cold rolling with secondary oil;
step seven: secondary cleaning;
step eight: trimming;
step nine: secondary annealing;
step ten: oil cold rolling for three times;
step eleven: leveling oil;
step twelve: shearing;
step thirteen: packaging;
step fourteen: warehousing;
in the first step, the raw materials are selected from: 2.3mm hot rolled pickled coil steel strip, the components of which are controlled as follows: 0.8-0.9% of C, 0.1-0.3% of Si, 0.1-0.5% of Mn, less than or equal to 0.03% of P, less than or equal to 0.015% of S, less than or equal to 0.2% of Ni, less than or equal to 0.25% of Cr and less than or equal to 0.25% of Cu; in the second step, a raw material slitting machine set is adopted for slitting the hot-rolled pickled coil raw material, the speed of a machine set is controlled to be 80-120m/min, in the third step, the hot-rolled pickled coil raw material subjected to slitting is subjected to first emulsion cold rolling, the rolling machine set 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;
in the fourth step, a cleaning process is carried out on the steel coil with the thickness of 1.8mm after the first cold rolling, the concentration of the chemical degreasing fluid is 50-70g/l, the concentration of the electrolytic degreasing fluid is 40-50g/l, and the electrolytic degreasing current is 10-20A/dm 2 The temperature is 55-70 ℃, and the unit tension of cleaning and unreeling is 3-4Kg/mm 2 The winding tension is controlled to be 5-6Kg/mm 2 ；
In the fifth step, the steel coil after primary cleaning is annealed for the first time, and a circulating spheroidizing annealing process is adopted for the first annealing, and the process is as follows:
and (3) heating: heating to 450 ℃ for 4 hours, preserving heat for 2 hours, and heating to 710 ℃ for 5 hours;
and (3) heat preservation: preserving heat at 710 ℃ for 1 hour, reducing the temperature to 690 ℃ for 0.5 hour, preserving heat for 1 hour, and raising the temperature to 710 ℃ for 0.5 hour, wherein the 3 hours are taken as one cycle, 6 cycles are added, and 18 hours are accumulated;
and (3) a cooling stage: cooling the steel plate with a cover for 4 hours to 550 ℃, then changing the cover for air cooling for 4 hours to 220 ℃, then water cooling to 50 ℃, discharging and air cooling;
in the step six, the steel coil after the first circulating ball annealing is subjected to secondary oil cold rolling, a 650 six-roller reversible oil rolling unit is adopted as a rolling unit, the total deformation of the secondary rolling is 33.3%, and the thickness of 1.8mm is rolled to the thickness of 1.2 mm;
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 fluid is 50-70g/l, the concentration of the electrolytic degreasing fluid is 40-50g/l, and the electrolytic degreasing current is 10-20A/dm 2 The temperature is 55-70 ℃, and the unreeling tension is 3-4kg/mm 2 Winding tension of 7-8Kg/mm 2 ；
In the step nine, the steel coil after the second cleaning is annealed for the second time, and a circulating ball annealing process is adopted for the second annealing, and the process is as follows:
and (3) heating: heating to 450 ℃ for 4 hours, preserving heat for 2 hours, and heating to 730 ℃ for 5 hours;
and (3) heat preservation: preserving heat at 730 ℃ for 1 hour, reducing the temperature to 700 ℃ for 0.5 hour, preserving heat for 1 hour, and raising the temperature to 730 ℃ for 0.5 hour, wherein 3 hours are taken as one cycle, 6 cycles are taken as a whole, and 18 hours are accumulated;
and (3) a cooling stage: cooling the steel plate with a cover for 4 hours to 550 ℃, then changing the cover for air cooling for 4 hours to 220 ℃, then water cooling to 50 ℃, and discharging and air cooling.
2. The method according to claim 1, wherein in the step ten, the steel coil after the second annealing is subjected to a third oil cold rolling, and the rolling mill set adopts a 650 six-roll reversible oil mill set, the total deformation is 31.25%, and the thickness of 1.2mm is rolled to the thickness of 0.825 mm.
3. The method according to claim 2, wherein in the step ten, the first two passes are performed by using a plain roller with a thickness of 0.2 μm and the last pass is performed by using a super-plain roller with a thickness of less than 0.1 μm.
4. The method for producing precision steel strip for crochet hook according to claim 1, wherein in the step eleven, constant extension control is adopted, the total pressure is leveled to be 100-150 tons, and the elongation is controlled to be 0.8% -1.2% by adopting a constant extension control mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111346661.6A CN114055082B (en) | 2021-11-15 | 2021-11-15 | Production method of high-grade special steel precision steel strip for crochet hook |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111346661.6A CN114055082B (en) | 2021-11-15 | 2021-11-15 | Production method of high-grade special steel precision steel strip for crochet hook |
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| Publication Number | Publication Date |
|---|---|
| CN114055082A CN114055082A (en) | 2022-02-18 |
| CN114055082B true CN114055082B (en) | 2024-02-06 |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1088237A (en) * | 1996-09-11 | 1998-04-07 | Sumitomo Metal Ind Ltd | Production of cold rolled high carbon steel strip |
| JPH11264049A (en) * | 1998-03-17 | 1999-09-28 | Sumitomo Metal Ind Ltd | High carbon steel strip and its production |
| CN102228902A (en) * | 2011-04-25 | 2011-11-02 | 无锡嘉联不锈钢有限公司 | Cold-rolling process of ultrathin stainless steel band |
| CN102383052A (en) * | 2011-10-13 | 2012-03-21 | 浪莎针织有限公司 | High wear resistance steel for knitting needle and manufacture method thereof |
| CN102560266A (en) * | 2010-12-10 | 2012-07-11 | 浪莎针织有限公司 | High-wear-resistant steel for knitting needle and manufacturing method thereof |
| CN105839022A (en) * | 2016-03-31 | 2016-08-10 | 宝钢不锈钢有限公司 | High-hardness non-magnetic nickelless stainless steel and manufacturing method thereof |
| CN107208224A (en) * | 2015-08-14 | 2017-09-26 | 株式会社特殊金属超越 | Cold-rolled high-carbon steel plate and its manufacture method |
| CN111560565A (en) * | 2020-06-29 | 2020-08-21 | 江苏九天光电科技有限公司 | Production method of high-quality special steel thin steel strip for measuring instrument |
| WO2021090472A1 (en) * | 2019-11-08 | 2021-05-14 | 株式会社特殊金属エクセル | High-carbon cold-rolled steel sheet and production method therefor, and mechanical parts made of high-carbon steel |
-
2021
- 2021-11-15 CN CN202111346661.6A patent/CN114055082B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1088237A (en) * | 1996-09-11 | 1998-04-07 | Sumitomo Metal Ind Ltd | Production of cold rolled high carbon steel strip |
| JPH11264049A (en) * | 1998-03-17 | 1999-09-28 | Sumitomo Metal Ind Ltd | High carbon steel strip and its production |
| CN102560266A (en) * | 2010-12-10 | 2012-07-11 | 浪莎针织有限公司 | High-wear-resistant steel for knitting needle and manufacturing method thereof |
| CN102228902A (en) * | 2011-04-25 | 2011-11-02 | 无锡嘉联不锈钢有限公司 | Cold-rolling process of ultrathin stainless steel band |
| CN102383052A (en) * | 2011-10-13 | 2012-03-21 | 浪莎针织有限公司 | High wear resistance steel for knitting needle and manufacture method thereof |
| CN107208224A (en) * | 2015-08-14 | 2017-09-26 | 株式会社特殊金属超越 | Cold-rolled high-carbon steel plate and its manufacture method |
| CN105839022A (en) * | 2016-03-31 | 2016-08-10 | 宝钢不锈钢有限公司 | High-hardness non-magnetic nickelless stainless steel and manufacturing method thereof |
| WO2021090472A1 (en) * | 2019-11-08 | 2021-05-14 | 株式会社特殊金属エクセル | High-carbon cold-rolled steel sheet and production method therefor, and mechanical parts made of high-carbon steel |
| CN113099723A (en) * | 2019-11-08 | 2021-07-09 | 株式会社特殊金属超越 | High-carbon cold-rolled steel sheet, method for producing same, and high-carbon steel machine component |
| CN111560565A (en) * | 2020-06-29 | 2020-08-21 | 江苏九天光电科技有限公司 | Production method of high-quality special steel thin steel strip for measuring instrument |
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