CN117778684A - Spring steel 60Si2Mn cold-rolled wide steel strip and manufacturing method thereof - Google Patents
Spring steel 60Si2Mn cold-rolled wide steel strip and manufacturing method thereof Download PDFInfo
- Publication number
- CN117778684A CN117778684A CN202410009736.9A CN202410009736A CN117778684A CN 117778684 A CN117778684 A CN 117778684A CN 202410009736 A CN202410009736 A CN 202410009736A CN 117778684 A CN117778684 A CN 117778684A
- Authority
- CN
- China
- Prior art keywords
- cold
- controlled
- annealing
- steel
- 60si2mn
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 97
- 239000010959 steel Substances 0.000 title claims abstract description 97
- 229910000639 Spring steel Inorganic materials 0.000 title claims abstract description 67
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 30
- 238000000137 annealing Methods 0.000 claims abstract description 95
- 238000005097 cold rolling Methods 0.000 claims abstract description 81
- 238000005096 rolling process Methods 0.000 claims abstract description 41
- 238000000034 method Methods 0.000 claims abstract description 29
- 238000005554 pickling Methods 0.000 claims abstract description 21
- 238000001816 cooling Methods 0.000 claims description 27
- 239000000839 emulsion Substances 0.000 claims description 15
- 239000002253 acid Substances 0.000 claims description 9
- 238000004321 preservation Methods 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims description 3
- 238000005336 cracking Methods 0.000 abstract description 5
- 238000010438 heat treatment Methods 0.000 abstract description 4
- 230000002349 favourable effect Effects 0.000 abstract 1
- 238000004804 winding Methods 0.000 abstract 1
- 229910001562 pearlite Inorganic materials 0.000 description 6
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 230000002441 reversible effect Effects 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000010960 cold rolled steel Substances 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 238000005482 strain hardening Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000003490 calendering Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Landscapes
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The embodiment of the invention provides a spring steel 60Si2Mn cold-rolled wide steel strip and a manufacturing method thereof, and relates to the field of spring steel 60Si2 Mn. The method aims to solve the problem that rolling is not moving, edge cracking and belt breakage are easy to occur in the cold rolling process of the spring steel 60Si2Mn cold-rolled wide steel belt. Which comprises straightening strip steel; pickling the hot rolled wide steel strip; primary annealing; the first cold rolling comprises the steps of controlling the coil winding temperature of the steel coil at 70-80 ℃, controlling the surface temperature of the rolled steel coil at 50-60 ℃, controlling the single-pass rolling reduction rate at 10.0-18.0%, controlling the total cold rolling deformation rate at 40.0-48.0%, and controlling the total cold rolling deformation amount at 1.0-3.0 mm. After the third annealing heat treatment and the second cold rolling, the cold-rolled wide steel strip is ensured to have excellent stamping processing performance. The first cold rolling ensures that the surface temperature of the strip steel reaches 50-60 ℃ during the first rolling of the strip steel, and is favorable for avoiding brittle strip breakage during cold rolling.
Description
Technical Field
The invention relates to the field of spring steel 60Si2Mn, in particular to a spring steel 60Si2Mn cold-rolled wide steel strip and a manufacturing method thereof.
Background
After being punched and heat treated, the spring steel 60Si2Mn cold-rolled steel strip has high elastic limit, high ultimate strength and good fatigue resistance. The method is widely applied to manufacturing parts such as spiral springs, spring retainer rings, spring washers, spring clamp springs and the like.
The main process flow of the spring steel 60Si2Mn cold-rolled wide steel strip is as follows: hot-rolled wide steel strip with the width of 800-1300mm, pickling, first annealing, first cold rolling, second annealing, second cold rolling, nth spheroidizing annealing, nth cold rolling, slitting by longitudinal shearing, packaging and warehousing. The spring steel 60Si2Mn has the following problems in the production process of the cold-rolled steel strip due to high carbon and silicon contents: 1. the high silicon content steel is more compact than the iron scale formed by the conventional steel, the pickling difficulty is high, and the surface quality of the cold-rolled product is influenced by uncleanness of pickling; and high silicon content results in rolling immobility. 2. Because the strip steel has high brittleness, edge crack and even strip breakage occur easily in the cold rolling process, and particularly the probability of occurrence in the first pass is high; 3. when the spheroidizing quality is poor and the spheroidizing is uneven, the deformation resistance in the cold rolling process is large, the rolling stability is poor, the thickness size fluctuation is large, and the high-precision size requirement is difficult to meet.
Disclosure of Invention
The invention aims to provide a manufacturing method of a spring steel 60Si2Mn cold-rolled wide steel strip, which can solve the problems of rolling immobility, edge cracking and strip breakage in the cold rolling process of the spring steel 60Si2Mn cold-rolled wide steel strip.
The invention further aims to provide the spring steel 60Si2Mn cold-rolled wide steel strip, which can solve the problems of rolling immobility, edge crack and strip breakage in the cold rolling process of the spring steel 60Si2Mn cold-rolled wide steel strip.
Embodiments of the invention may be implemented as follows:
the embodiment of the invention provides a manufacturing method of a spring steel 60Si2Mn cold-rolled wide steel strip, which comprises the following steps:
straightening strip steel, pickling hot-rolled wide strip steel, performing first annealing, performing first cold rolling, performing second annealing, performing second cold rolling and performing third annealing;
wherein the first cold rolling step comprises: and (3) carrying out cold rolling on the hot rolled wide steel strip with the thickness of 2.5-6.0 mm after the primary annealing treatment, wherein the coiling temperature of the steel strip is controlled at 70-80 ℃, the surface temperature of the rolled steel strip is controlled at 50-60 ℃, the single-pass reduction rate is controlled at 10.0-18.0%, the total cold rolling deformation rate is controlled at 40.0-48.0%, and the total cold rolling deformation is controlled at 1.0-3.0 mm.
In addition, the manufacturing method of the spring steel 60Si2Mn cold-rolled wide steel strip provided by the embodiment of the invention can also have the following additional technical characteristics:
optionally, after the first annealing treatment, the ratio of the carbide structure diameter of the metallographic structure to the carbide structure diameter of 0.3-0.8um is more than or equal to 92%; after the second annealing treatment, the ratio of the carbide tissue diameter in the tissue to the carbide tissue diameter of 0.2-0.6um is more than or equal to 95 percent; after the third annealing treatment, the ratio of the tissue carbide tissue diameter of 0.2-0.6um is more than or equal to 98 percent.
Optionally, the step of pickling the hot rolled wide steel strip comprises: the pickling speed is 30-50 m/min, the acid solution concentration is 110-220 g/L, and the acid solution temperature is 80-85 ℃.
Optionally, the step of first annealing includes: heat preservation is carried out for 4 hours at 760 ℃ to 770 ℃, then 10 ℃/s is reduced to 740 ℃ for heat preservation for 16 hours, cooling is carried out with a furnace to 640 ℃ to 650 ℃, air cooling is carried out by changing a cooling cover, cooling is carried out to 350 ℃ to 380 ℃, and spray cooling is carried out to 90 ℃ to 100 ℃ for discharging.
Optionally, the step of first cold rolling further comprises: the temperature of the emulsion is controlled at 50-55 ℃, the mass concentration of the emulsion is controlled at 3.0% -3.5%, the rolling speed is controlled at 300-400 m/min, the rolling force is controlled at 15000-21000 KN, the outlet tension is controlled at 220-350 KN, the inlet tension is controlled at 180-250 KN, and the outlet tension is larger than the inlet tension.
Optionally, the step of annealing the second time includes: the annealing temperature is 740-750 ℃, the heat is preserved for 14-17 h, the annealing temperature is cooled to 640-650 ℃ along with the furnace, the cooling cover is changed for air cooling, the annealing temperature is cooled to 350-380 ℃, and the annealing temperature is sprayed and cooled to 80-90 ℃ and is discharged from the furnace.
Optionally, after the second annealing treatment, the tensile strength is controlled to be 650MPa-720MPa, the yield strength is controlled to be 550MPa-630Pa, the elongation is controlled to be 25.0% -35.0%, and the Brinell hardness is 190-210HB.
Optionally, the step of second cold rolling includes: the total deformation rate of the cold rolling is controlled to be 35.0% -45.0%; the temperature of the emulsion is controlled at 50-55 ℃, the mass concentration of the emulsion is controlled at 3.0-3.5%, the rolling speed is controlled at 350-500 m/min, and the rolling force is controlled at 14000-19000 KN; the outlet tension is controlled to be 150KN-250KN, and the inlet tension is controlled to be 120KN-220KN; the outlet tension is greater than the inlet tension.
Optionally, the step of third annealing includes: the annealing temperature is 730-740 ℃, the heat is preserved for 12-15 h, the annealing temperature is cooled to 580-600 ℃ along with the furnace, the cooling cover is changed for air cooling, the annealing temperature is cooled to 340-360 ℃, and the annealing temperature is sprayed and cooled to 80-85 ℃ and is discharged from the furnace.
The embodiment of the invention also provides a spring steel 60Si2Mn cold-rolled wide steel strip. The spring steel 60Si2Mn cold-rolled wide steel strip is manufactured by adopting a manufacturing method of the spring steel 60Si2Mn cold-rolled wide steel strip, and the spring steel 60Si2Mn cold-rolled wide steel strip comprises the following components: c:0.58-0.64%, mn:0.70-0.90%, S is less than or equal to 0.010%, P is less than or equal to 0.020%, si:1.6-2.0%, cr:0.20-0.35%, ni:0.15-0.25%, cu: less than or equal to 0.20 percent, als:0.010-0.060%.
The spring steel 60Si2Mn cold-rolled wide steel strip and the manufacturing method thereof have the beneficial effects that:
the manufacturing method of the spring steel 60Si2Mn cold-rolled wide steel strip comprises the following steps: straightening strip steel; pickling the hot rolled wide steel strip; primary annealing; cold rolling for the first time; the first cold rolling step includes: cold rolling the hot rolled wide steel strip with the thickness of 2.5mm-6.0mm after the primary annealing treatment, controlling the coiling temperature of the steel strip at 70-80 ℃, controlling the surface temperature of the rolled steel strip at 50-60 ℃, controlling the single-pass rolling reduction rate at 10.0-18.0%, controlling the total cold rolling deformation rate at 40.0-48.0%, and controlling the total cold rolling deformation amount at 1.0-3.0 mm; annealing for the second time; cold rolling for the second time; and (3) annealing for the third time.
After the third annealing heat treatment and the second cold rolling, the spring steel 60Si2Mn cold-rolled wide steel strip with uniformly distributed granular pearlite structure is obtained, and the spring steel 60Si2Mn cold-rolled wide steel strip is ensured to have excellent stamping processing performance. The hot-rolled wide steel strip after pickling is subjected to cold rolling for the first time, so that the surface temperature of the steel strip reaches 50-60 ℃ during the first time of rolling of the steel strip, and the brittle broken strip during cold rolling is avoided. Realize stable rolling, guarantee product quality, avoid rolling edge crack and broken area to appear.
The spring steel 60Si2Mn cold-rolled wide steel strip is manufactured by adopting the manufacturing method, so that the problems of rolling immobility, edge crack and strip breakage easily occur in the cold-rolling process of the spring steel 60Si2Mn cold-rolled wide steel strip can be solved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a block diagram showing steps of a method for manufacturing a spring steel 60Si2Mn cold-rolled wide steel strip according to the present embodiment.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present invention, it should be noted that, if the terms "upper", "lower", "inner", "outer", and the like indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, or the azimuth or the positional relationship in which the inventive product is conventionally put in use, it is merely for convenience of describing the present invention and simplifying the description, and it is not indicated or implied that the apparatus or element referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus it should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, if any, are used merely for distinguishing between descriptions and not for indicating or implying a relative importance.
It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.
The method for manufacturing the spring steel 60Si2Mn cold-rolled wide strip according to the present embodiment will be described in detail with reference to fig. 1.
Referring to fig. 1, an embodiment of the invention provides a method for manufacturing a spring steel 60Si2Mn cold-rolled wide steel strip, which comprises the following steps:
step S1, straightening strip steel;
step S2, pickling the hot rolled wide steel strip;
step S3, primary annealing;
s4, performing first cold rolling; the first cold rolling step includes: cold rolling the hot rolled wide steel strip with the thickness of 2.5mm-6.0mm after the primary annealing treatment, controlling the coiling temperature of the steel strip at 70-80 ℃, controlling the surface temperature of the rolled steel strip at 50-60 ℃, controlling the single-pass rolling reduction rate at 10.0-18.0%, controlling the total cold rolling deformation rate at 40.0-48.0%, and controlling the total cold rolling deformation amount at 1.0-3.0 mm;
s5, annealing for the second time;
s6, performing secondary cold rolling;
and S7, annealing for the third time.
Before entering the acid tank, the strip steel is straightened by a nine-roller straightener. The first annealing spheroidizing is ready for cold rolling. The first annealing and the first cold rolling are to avoid cracking during the cold rolling. And the second annealing eliminates work hardening generated by cold rolling and further spheroidizing. And the second cold rolling realizes stable rolling and high-precision quality control of thickness.
The spring steel 60Si2Mn hot rolled wide steel strip after acid washing is subjected to cold rolling by adopting a 1450mm single-frame six-roller reversible rolling mill for the first cold rolling. After the steel coil is discharged from the furnace at 90-100 ℃ after the primary annealing treatment, the steel coil is immediately transferred to a cold rolling mill for cold rolling, so that the surface temperature of the steel strip reaches 50-60 ℃ during the primary rolling of the steel strip, and the brittle broken strip during the cold rolling is avoided. Stable rolling is realized, the product quality is ensured, and rolling edge cracking and belt breakage are further avoided. The continuous and stable rolling of the spring steel 60Si2Mn cold-rolled wide steel strip can be realized, and the dimensional accuracy and the product quality are ensured.
Strip straightening and hot-rolled wide strip pickling are performed on hot-rolled wide strips with a thickness of 2.5mm-6.0mm and a width of 900mm-1300 mm.
The strip steel is pulled and straightened by a nine-roller straightener before entering an acid tank, and the parameters of straightening and rolling are shown in table 1.
TABLE 1 straightening roll pressing parameters
And the surface scale of the strip steel is loosened through straightening, so that the surface scale of the spring steel 60Si2Mn hot rolled wide strip steel is further ensured to be washed clean, and the surface quality of the subsequent spring steel 60Si2Mn cold rolled wide strip steel is ensured.
In the embodiment, after the first annealing treatment in the step S3, the ratio of the carbide structure diameter of the metallographic structure to the diameter of 0.3-0.8um is more than or equal to 92%; after the second annealing treatment in the step S5, the ratio of the carbide tissue diameter in the tissue to the carbide tissue diameter of 0.2-0.6um is more than or equal to 95 percent; after the third annealing treatment in the step S7, the ratio of the tissue diameter of the tissue carbide is more than or equal to 98 percent and is 0.2-0.6 um.
After the first annealing treatment in the step S3, the Brinell hardness of the spring steel 60Si2Mn hot rolled wide steel strip is 190-215HB, and the ratio of the carbide structure diameter of the metallographic structure is 0.3-0.8um is more than or equal to 92 percent.
After the second spheroidizing annealing in the step S5, the tensile strength is controlled to be 650MPa-720MPa, the yield strength is controlled to be 550MPa-630Pa, the elongation is controlled to be 25.0% -35.0%, the Brinell hardness is 190-210HB, and the ratio of the carbide tissue diameter in the tissue is 0.2-0.6um is more than or equal to 95%.
After the third annealing treatment in the step S7, the tensile strength of the spring steel 60Si2Mn is controlled to be 550-680 MPa, the yield strength is controlled to be 400-460 MPa, the elongation is controlled to be 27.0-34.0%, the Vickers hardness is controlled to be 180-200HV, and the ratio of the tissue carbide tissue diameter to be 0.2-0.6um is more than or equal to 98%.
In this embodiment, step S2 of pickling the hot rolled wide strip comprises: the pickling speed is 30-50 m/min, the acid solution concentration is 110-220 g/L, and the acid solution temperature is 80-85 ℃.
The spring steel 60Si2Mn hot rolled wide steel strip is pickled by adopting hydrochloric acid pickling, and a push-pull type pickling line is adopted, so that the surface of the steel coil is not coated with oil in the pickling process, black spots are prevented from being formed in the subsequent annealing process, and the surface quality of the spring steel 60Si2Mn cold rolled wide steel strip is further ensured.
In this embodiment, the first annealing in step S3 includes: heat preservation is carried out for 4 hours at 760 ℃ to 770 ℃, then 10 ℃/s is reduced to 740 ℃ for heat preservation for 16 hours, cooling is carried out with a furnace to 640 ℃ to 650 ℃, air cooling is carried out by changing a cooling cover, cooling is carried out to 350 ℃ to 380 ℃, and spray cooling is carried out to 90 ℃ to 100 ℃ for discharging.
And (5) annealing treatment is carried out by adopting a full hydrogen hood-type annealing furnace. The first annealing is carried out by carrying out the first spheroidizing annealing treatment on the spring steel 60Si2Mn hot rolled wide steel strip, so that the flaky pearlite in the hot rolled structure is spheroidized, and a certain amount and size of granular pearlite structure is obtained, thereby reducing the hardness and strength of the steel strip and improving the plasticity. The annealed spring steel 60Si2Mn hot rolled wide steel strip is ensured to have good structure and performance, and is prepared for cold rolling.
In this embodiment, the first cold rolling in step S4 further includes: the temperature of the emulsion is controlled at 50-55 ℃, the mass concentration of the emulsion is controlled at 3.0% -3.5%, the rolling speed is controlled at 300-400 m/min, the rolling force is controlled at 15000-21000 KN, the outlet tension is controlled at 220-350 KN, the inlet tension is controlled at 180-250 KN, and the outlet tension is larger than the inlet tension.
And optimizing the lubrication parameters of the emulsion in the first cold rolling process. The rolling tension setting adopts a strategy that the outlet tension is larger than the inlet tension. The first cold rolling realizes stable rolling, ensures the product quality, and further avoids the occurrence of rolling edge crack and broken belt.
In this embodiment, the second annealing in step S5 includes: the annealing temperature is 740-750 ℃, the heat is preserved for 14-17 h, the annealing temperature is cooled to 640-650 ℃ along with the furnace, the cooling cover is changed for air cooling, the annealing temperature is cooled to 350-380 ℃, and the annealing temperature is sprayed and cooled to 80-90 ℃ and is discharged from the furnace.
And (5) carrying out secondary annealing treatment by adopting a full-hydrogen hood-type annealing furnace. The second annealing eliminates the work hardening phenomenon generated by the first cold rolling, further makes the structure of the spring steel 60Si2Mn cold-rolled wide steel strip more uniform, and prepares for the subsequent cold rolling.
In the embodiment, after the second annealing treatment in the step S5, the tensile strength is controlled to be 650MPa-720MPa, the yield strength is controlled to be 550MPa-630Pa, the elongation is controlled to be 25.0% -35.0%, and the Brinell hardness is 190-210HB.
After the second spheroidizing annealing, the tensile strength is controlled at 650MPa-720MPa, the yield strength is controlled at 550MPa-630Pa, the elongation is controlled at 25.0% -35.0%, the Brinell hardness is 190-210HB, and the carbide tissue diameter in the tissue is 0.2-0.6um with the percentage of more than or equal to 95%.
In this embodiment, the second cold rolling in step S6 includes: the total deformation rate of the cold rolling is controlled to be 35.0% -45.0%; the temperature of the emulsion is controlled at 50-55 ℃, the mass concentration of the emulsion is controlled at 3.0-3.5%, the rolling speed is controlled at 350-500 m/min, and the rolling force is controlled at 14000-19000 KN; the outlet tension is controlled to be 150KN-250KN, and the inlet tension is controlled to be 120KN-220KN; the outlet tension is greater than the inlet tension.
The secondary cold rolling can realize stable rolling, ensure the product quality and avoid rolling strip breakage. The thickness is controlled with high precision and quality by the second cold rolling, the thickness tolerance after cold rolling is controlled within-10 mu m to +10 mu m, and the surface of the steel strip is smooth and flat.
Continuously adopting a 1450mm single-frame six-roller reversible rolling mill to perform secondary cold rolling on the spring steel 60Si2Mn cold-rolled wide steel strip subjected to secondary spheroidizing annealing; the total deformation rate of the cold rolling is controlled to be 35.0% -45.0%. The second cold rolling adopts emulsion lubrication. The rolling tension setting adopts a strategy that the outlet tension is larger than the inlet tension.
In this embodiment, the third annealing in step S7 includes: the annealing temperature is 730-740 ℃, the heat is preserved for 12-15 h, the annealing temperature is cooled to 580-600 ℃ along with the furnace, the cooling cover is changed for air cooling, the annealing temperature is cooled to 340-360 ℃, and the annealing temperature is sprayed and cooled to 80-85 ℃ and is discharged from the furnace.
And adopting a full hydrogen hood-type annealing furnace to carry out the third annealing treatment. After the third annealing treatment, the tensile strength of the spring steel 60Si2Mn is controlled to be 550-680 MPa, the yield strength is controlled to be 400-460 MPa, the elongation is controlled to be 27.0-34.0%, the Vickers hardness is controlled to be 180-200HV, the ratio of the tissue diameter of the tissue carbide to be 0.2-0.6 mu m is more than or equal to 98%, and the spring steel is packaged and warehoused after being inspected and judged to be qualified by various technical indexes.
And thirdly, carrying out spheroidizing annealing treatment on the spring steel 60Si2Mn cold-rolled wide steel strip for the third time to obtain the uniformly distributed granular pearlite structure. The Vickers hardness is controlled to be 180-200HV, and the annealing spheroidization rate is controlled to be more than or equal to 98%. The spring steel 60Si2Mn cold-rolled wide steel strip is guaranteed to have excellent stamping processing performance, smooth stamping and deformation processing can be realized, and the user requirements are better met.
According to the manufacturing method of the spring steel 60Si2Mn cold-rolled wide steel strip provided by the embodiment, the working principle of the manufacturing method of the spring steel 60Si2Mn cold-rolled wide steel strip is as follows: after the third annealing heat treatment and the second cold rolling, the spring steel 60Si2Mn cold-rolled wide steel strip with uniformly distributed granular pearlite structure is obtained, the Vickers hardness is 180-200HV, the annealing spheroidization rate is more than or equal to 98%, and the thickness dimension tolerance is controlled between-10 mu m and +10 mu m. The spring steel 60Si2Mn cold-rolled wide steel strip is guaranteed to have excellent stamping processing performance, smooth stamping and deformation processing can be realized, and the requirements of the user on dimensional precision and product quality are met better.
The manufacturing method of the spring steel 60Si2Mn cold-rolled wide steel strip provided by the embodiment has at least the following advantages:
by optimizing the pickling process and setting straightening parameters, the surface quality of the spring steel 60Si2Mn pickling is improved.
The cold rolling parameters are optimized by improving the solubility and the temperature of the emulsion, so that the surface temperature of the steel coil during cold rolling is ensured, and the cold rolling strip breakage phenomenon is reduced.
The method adopts the designed full-hydrogen bell-type furnace annealing process for heat treatment, and the designed 1450mm single-frame six-roller reversible rolling mill cold rolling process parameters, and the steel strip is subjected to large-deformation cold rolling and calendaring after annealing, so that pearlite grains are elongated and crushed, crystal defects are greatly increased, annealing driving energy is obviously increased, the annealed structure is more uniform, and meanwhile, the dimensional accuracy is excellent.
The high silicon steel is subjected to primary annealing, primary control of a cold rolling process and total process control of cold rolling, so that rolling immobility, edge cracking and strip breakage in the 60Si2Mn cold rolling process are avoided. The surface quality of the spring steel 60Si2Mn is improved.
The embodiment of the invention also provides a spring steel 60Si2Mn cold-rolled wide steel strip. The spring steel 60Si2Mn cold-rolled wide steel strip is manufactured by adopting a manufacturing method of the spring steel 60Si2Mn cold-rolled wide steel strip, and comprises the following components: c:0.58-0.64%, mn:0.70-0.90%, S is less than or equal to 0.010%, P is less than or equal to 0.020%, si:1.6-2.0%, cr:0.20-0.35%, ni:0.15-0.25%, cu: less than or equal to 0.20 percent, als:0.010-0.060%.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be included in the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The manufacturing method of the spring steel 60Si2Mn cold-rolled wide steel strip is characterized by comprising the following steps of:
straightening strip steel, pickling hot-rolled wide strip steel, performing first annealing, performing first cold rolling, performing second annealing, performing second cold rolling and performing third annealing;
wherein the first cold rolling step comprises: and (3) carrying out cold rolling on the hot rolled wide steel strip with the thickness of 2.5-6.0 mm after the primary annealing treatment, wherein the coiling temperature of the steel strip is controlled at 70-80 ℃, the surface temperature of the rolled steel strip is controlled at 50-60 ℃, the single-pass reduction rate is controlled at 10.0-18.0%, the total cold rolling deformation rate is controlled at 40.0-48.0%, and the total cold rolling deformation is controlled at 1.0-3.0 mm.
2. The method for manufacturing a spring steel 60Si2Mn cold-rolled wide steel strip according to claim 1, wherein:
after the first annealing treatment, the ratio of the carbide structure diameter of the metallographic structure to the diameter of 0.3-0.8um is more than or equal to 92 percent; after the second annealing treatment, the ratio of the carbide tissue diameter in the tissue to the carbide tissue diameter of 0.2-0.6um is more than or equal to 95 percent; after the third annealing treatment, the ratio of the tissue carbide tissue diameter of 0.2-0.6um is more than or equal to 98 percent.
3. The method for manufacturing a spring steel 60Si2Mn cold-rolled wide steel strip according to claim 1, wherein the step of pickling the hot-rolled wide steel strip comprises: the pickling speed is 30-50 m/min, the acid solution concentration is 110-220 g/L, and the acid solution temperature is 80-85 ℃.
4. The method for manufacturing a spring steel 60Si2Mn cold-rolled wide strip according to claim 1, wherein the step of first annealing comprises:
heat preservation is carried out for 4 hours at 760 ℃ to 770 ℃, then 10 ℃/s is reduced to 740 ℃ for heat preservation for 16 hours, cooling is carried out with a furnace to 640 ℃ to 650 ℃, air cooling is carried out by changing a cooling cover, cooling is carried out to 350 ℃ to 380 ℃, and spray cooling is carried out to 90 ℃ to 100 ℃ for discharging.
5. The method of manufacturing a spring steel 60Si2Mn cold-rolled wide strip according to claim 1, wherein the step of first cold rolling further comprises:
the temperature of the emulsion is controlled at 50-55 ℃, the mass concentration of the emulsion is controlled at 3.0% -3.5%, the rolling speed is controlled at 300-400 m/min, the rolling force is controlled at 15000-21000 KN, the outlet tension is controlled at 220-350 KN, the inlet tension is controlled at 180-250 KN, and the outlet tension is larger than the inlet tension.
6. The method for manufacturing a spring steel 60Si2Mn cold-rolled wide strip according to claim 1, wherein the step of the second annealing comprises:
the annealing temperature is 740-750 ℃, the heat is preserved for 14-17 h, the annealing temperature is cooled to 640-650 ℃ along with the furnace, the cooling cover is changed for air cooling, the annealing temperature is cooled to 350-380 ℃, and the annealing temperature is sprayed and cooled to 80-90 ℃ and is discharged from the furnace.
7. The method for manufacturing a spring steel 60Si2Mn cold-rolled wide strip according to claim 6, wherein:
after the second annealing treatment, the tensile strength is controlled to be 650MPa-720MPa, the yield strength is controlled to be 550MPa-630Pa, the elongation is controlled to be 25.0% -35.0%, and the Brinell hardness is 190-210HB.
8. The method for manufacturing a spring steel 60Si2Mn cold-rolled wide steel strip according to claim 1, wherein the step of the second cold rolling comprises:
the total deformation rate of the cold rolling is controlled to be 35.0% -45.0%; the temperature of the emulsion is controlled at 50-55 ℃, the mass concentration of the emulsion is controlled at 3.0-3.5%, the rolling speed is controlled at 350-500 m/min, and the rolling force is controlled at 14000-19000 KN; the outlet tension is controlled to be 150KN-250KN, and the inlet tension is controlled to be 120KN-220KN; the outlet tension is greater than the inlet tension.
9. The method for manufacturing a spring steel 60Si2Mn cold-rolled wide strip according to claim 1, wherein the third annealing step comprises:
the annealing temperature is 730-740 ℃, the heat is preserved for 12-15 h, the annealing temperature is cooled to 580-600 ℃ along with the furnace, the cooling cover is changed for air cooling, the annealing temperature is cooled to 340-360 ℃, and the annealing temperature is sprayed and cooled to 80-85 ℃ and is discharged from the furnace.
10. A spring steel 60Si2Mn cold-rolled wide strip manufactured by the method for manufacturing a spring steel 60Si2Mn cold-rolled wide strip according to any one of claims 1 to 9, characterized in that the spring steel 60Si2Mn cold-rolled wide strip comprises the following components: c:0.58-0.64%, mn:0.70-0.90%, S is less than or equal to 0.010%, P is less than or equal to 0.020%, si:1.6-2.0%, cr:0.20-0.35%, ni:0.15-0.25%, cu: less than or equal to 0.20 percent, als:0.010-0.060%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410009736.9A CN117778684A (en) | 2024-01-03 | 2024-01-03 | Spring steel 60Si2Mn cold-rolled wide steel strip and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410009736.9A CN117778684A (en) | 2024-01-03 | 2024-01-03 | Spring steel 60Si2Mn cold-rolled wide steel strip and manufacturing method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117778684A true CN117778684A (en) | 2024-03-29 |
Family
ID=90384900
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410009736.9A Pending CN117778684A (en) | 2024-01-03 | 2024-01-03 | Spring steel 60Si2Mn cold-rolled wide steel strip and manufacturing method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117778684A (en) |
-
2024
- 2024-01-03 CN CN202410009736.9A patent/CN117778684A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110904319B (en) | Manufacturing process of high-carbon tool steel SK85 cold-rolled wide steel strip | |
| US5624504A (en) | Duplex structure stainless steel having high strength and elongation and a process for producing the steel | |
| CN111041382A (en) | 1800 MPa-grade non-coating hot forming steel with low high-temperature friction coefficient and preparation method thereof | |
| KR20030030032A (en) | Steel plate excellent in shape freezing property and method for production thereof | |
| CN113399456B (en) | Ultrathin 65Mn cold-rolled wide steel strip and manufacturing method thereof | |
| CN110218852B (en) | 301 stainless steel production method, 301 stainless steel and application | |
| EP0731182A2 (en) | Method for making a steel sheet suitable as a material for can making | |
| JPH0814004B2 (en) | Method for producing high-ductility and high-strength dual-phase chrome stainless steel strip with excellent corrosion resistance | |
| CN111394643A (en) | 420 MPa-grade cold-rolled low-alloy high-strength steel for automobiles and production method thereof | |
| CN111321341A (en) | 1500 MPa-grade non-coating hot forming steel with low high-temperature friction coefficient and preparation method thereof | |
| CN105177423A (en) | Large-wall-thickness X65M pipeline steel plate and manufacturing method thereof | |
| CN104593698B (en) | Method for manufacturing high-strength cold-rolled weather resisting steel plates and high-strength cold-rolled weather resisting steel plates | |
| CN109457188A (en) | Hot-dip galvanized sheet for U-shaped shell of roller washing machine and preparation method thereof | |
| JP4102284B2 (en) | {100} <011> Cold rolled steel sheet manufacturing method with excellent shape freezing property with developed orientation | |
| JPS6386819A (en) | Production of cold rolled steel sheet for deep drawing | |
| CN117778684A (en) | Spring steel 60Si2Mn cold-rolled wide steel strip and manufacturing method thereof | |
| JPH07107178B2 (en) | Method for producing high strength dual phase chromium stainless steel strip with excellent ductility | |
| CN114985453B (en) | Thick spring steel 51CrV4 cold-rolled wide steel strip and manufacturing method thereof | |
| CN1043063C (en) | Low alloy structural steel | |
| JPS6052551A (en) | Steel having high ductility and high workability and its production | |
| CN114959478B (en) | Multi-purpose 800MPa grade complex phase steel and regulation and control method thereof | |
| CN114055082B (en) | Production method of high-grade special steel precision steel strip for crochet hook | |
| JPH07100823B2 (en) | Manufacturing method of high ductility and high strength dual phase structure chromium stainless steel strip with small in-plane anisotropy. | |
| JP3806983B2 (en) | Cold-rolled steel sheet material for deep drawing with excellent ridging resistance after cold rolling and annealing | |
| CN118653100A (en) | Production method of thin-specification cold-rolled high-strength steel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |