CN113578962B - Production method of ultrathin cold-rolled steel strip for clothes - Google Patents
Production method of ultrathin cold-rolled steel strip for clothes Download PDFInfo
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- CN113578962B CN113578962B CN202110838501.7A CN202110838501A CN113578962B CN 113578962 B CN113578962 B CN 113578962B CN 202110838501 A CN202110838501 A CN 202110838501A CN 113578962 B CN113578962 B CN 113578962B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
- B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B15/0007—Cutting or shearing the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/02—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of sheets
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/30—Stress-relieving
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold rolling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B15/0007—Cutting or shearing the product
- B21B2015/0021—Cutting or shearing the product in the rolling direction
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/10—Reduction of greenhouse gas [GHG] emissions
- Y02P10/143—Reduction of greenhouse gas [GHG] emissions of methane [CH4]
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Child & Adolescent Psychology (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention discloses a production method of an ultrathin cold-rolled steel strip for clothing, which comprises the following steps of selecting raw materials, softening and annealing, rolling, rewinding, stress relief annealing, tension straightening, slitting, inspecting, packaging and warehousing; the invention carries out a series of innovative designs, replaces hot rolled steel strips with hard rolled coils from the selection of raw materials, reduces procedures such as hot rolling pickling, rough rolling and the like, and greatly shortens the process flow; innovating from the rolling process, reducing one rolling process, improving the production efficiency and reducing the rolling cost; innovating from the heat treatment process, increasing a temperature rising platform and improving the uniformity of the performance; the double-bending double-straightening stretching and straightening process is adopted to replace a leveling process, so that the elimination capability of the belt type and yield platforms is improved.
Description
Technical Field
The invention relates to the technical field of cold-rolled steel strips, in particular to a production method of an ultrathin cold-rolled steel strip for clothes.
Background
The existing production process of the cold-rolled steel strip for clothes comprises the following steps:
the process route comprises the steps of raw material (2.5-2.75 mm hot rolled steel strip), pickling, primary rolling (four-frame continuous rolling), intermediate annealing, secondary rolling (four-frame continuous rolling), coil separation, coil loosening, stress relief annealing, leveling, inspection, packaging and warehousing.
The rolling process is divided into two rolling processes, wherein the first rolling process is 2.5 mm-2.0 mm-1.5 mm-1.1 mm-0.9 mm; the second rolling process is 0.9 mm-0.6 mm-0.45 mm-0.25 mm-0.2 mm.
The annealing process is divided into two times of annealing, and the intermediate annealing process comprises charging, heating to 680 ℃ (heating rate 85 ℃/h, heating time 8 h), heat preservation 680 ℃ (heat preservation time 18 h), air cooling to 350 ℃ (air cooling time 5 h), cooling to 100 ℃ along with the furnace, cooling for 16h along with the furnace, and discharging; the stress relief annealing comprises charging, heating to 650 ℃ (heating rate 85 ℃/h, heating time 8 h), heat preservation 680 ℃ (heat preservation time 18 h), air cooling to 320 ℃ (air cooling time 5 h), furnace cooling to 100 ℃ (furnace cooling time 16 h), and furnace discharging
Disadvantages of the prior art
(1) The process route is long, and the production efficiency is low: 2 rolling passes and 8 passes are needed from raw materials to finished products, the number of the processing passes is large, and the processing cost is high.
(2) The quality of the steel belt is unstable, and the waste rate of the product is higher: when the product is applied to deep drawing, the anisotropy of the steel strip can cause skirt lace defects to the punched part, thereby leading to the increase of the waste rate.
(3) Has certain environmental influence: the hot rolled coil needs acid washing to remove oxide skin, and the waste water can affect the environment.
Disclosure of Invention
The invention aims to provide a production method of an ultrathin cold-rolled steel strip for clothes, which aims to solve the problems in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a production method of ultrathin cold-rolled steel strip for clothing, which comprises the following steps,
step one, selecting raw materials: selecting a steel belt with the specification of 0.7mm x 575-615 mm;
step two, softening and annealing: the softening annealing adopts a natural gas bright bell-type furnace, and specifically comprises the following steps of;
charging: the steel strip in the first step is stacked on a furnace table in a delta shape, and an inner container is buckled;
heating: covering a heating cover, and heating to 670 ℃ at a heating rate of 80 ℃/h;
and (3) heat preservation: preserving heat at 670 ℃ for 17 hours;
air cooling: lifting the heating cover, cooling to 580 ℃ along with the furnace, fastening the cooling cover, performing air cooling for 4h, lifting the cooling cover when the temperature in the furnace is reduced to 320 ℃, and cooling along with the furnace;
air cooling: when the temperature of the steel belt is reduced to 100 ℃, hanging away the liner, and performing air cooling;
discharging: and discharging when the air cooling is carried out to room temperature.
Step three, rolling: and (3) conveying the steel strip in the second step to an HC rolling mill for 4-pass rolling, wherein rolling reduction is sequentially 0.7mm, 0.50mm, 0.35mm, 0.25mm and 0.20mm, and all flat rollers are adopted in the rolling process, and the plate type is regulated by drawing through an intermediate roller.
Step four, rewinding: and (3) conveying the steel belt in the third step to a rewinding unit for unreeling.
Step five, stress relief annealing, adopting an electric heating hood-type bright annealing furnace, specifically comprising the following steps,
charging: stacking the steel strip single coil in the fourth step onto a furnace table, buckling an inner container, and introducing high-hydrogen protective gas; heating: covering a heating cover, heating to 480 ℃ at a heating rate of 120 ℃/h, and preserving heat for 2h at the temperature; then continuously heating, and heating to 650 ℃ at a heating rate of 80 ℃/h;
and (3) heat preservation: preserving heat at 650 ℃ for 16 hours;
air cooling: lifting away the heating cover, cooling to 500 ℃ along with the furnace, fastening the cooling cover for air cooling for 4h, lifting away the cooling cover when the temperature in the furnace is reduced to 280 ℃, and cooling along with the furnace;
air cooling: when the temperature of the steel coil is reduced to 80 ℃, hanging away the liner, and performing air cooling;
discharging: and discharging when the air cooling is carried out to room temperature.
Step six, withdrawal and straightening: and (3) conveying the steel belt in the fifth step to a drawing and straightening unit for drawing and straightening by adopting double bending and double straightening.
Step seven, slitting: and D, conveying the steel belt in the step six to a slitting machine set for edge cutting or slitting into narrow strips.
Step eight, checking, packaging and warehousing: and D, inspecting the steel belt in the step seven, and packaging and warehousing after the steel belt is inspected to be qualified.
Furthermore, after the liner is buckled in the second step, high-hydrogen protective gas is introduced, and the hydrogen is used as the protective gas of the heat transfer medium and the characteristic of high heat conduction efficiency of the hydrogen, so that the uniform heating of the steel strip can be effectively ensured.
Compared with the prior art, the invention has the beneficial effects that:
the invention carries out a series of innovative designs, replaces hot rolled steel strips with hard rolled coils from the selection of raw materials, reduces procedures such as hot rolling pickling, rough rolling and the like, and greatly shortens the process flow; innovating from the rolling process, reducing one rolling process, improving the production efficiency and reducing the rolling cost; innovating from the heat treatment process, increasing a temperature rising platform and improving the uniformity of the performance; the double-bending double-straightening stretching and straightening process is adopted to replace a leveling process, so that the elimination capability of the belt type and yield platforms is improved.
(1) In the aspect of raw material selection, the hot rolled steel strip is replaced by the hard rolled coil, so that the original procedures of hot rolling, pickling, rough rolling and the like are reduced, the process flow is greatly shortened, and meanwhile, the environmental influence caused by pickling is reduced.
(2) In the aspect of the rolling process, the rolling process is reduced from two rolling processes to one rolling process, namely 4 rolling processes are reduced, the production efficiency is improved, and meanwhile, the rolling cost is reduced.
(3) In the aspect of annealing process, a heat preservation platform is added in the heating stage, and the uniformity of furnace temperature in the annealing process is improved through the control of heating rate, namely the uniformity of the performance of the steel strip is improved, meanwhile, the heat preservation time is shortened, the annealing period is shortened as a whole, and the energy is saved.
(4) The stretch bending correction technology of double bending and double correction is used for replacing a leveling procedure, so that the quality defects of wave edges, wave shapes, buckling, sickle bending and the like are eliminated, a good plate shape is obtained, meanwhile, the anisotropy of a steel belt is reduced, and the deep drawing performance of a product is improved.
Drawings
Fig. 1 is a process flow diagram of the present invention.
Detailed Description
The following describes embodiments of the present invention in detail, however, the embodiments of the present invention are not limited thereto. 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.
In the embodiment of the invention, the following steps are included: provides a production method of ultrathin cold-rolled steel strip for clothing, which comprises the following steps,
step one, raw material selection: selecting a rolled hard coil with the specification of 0.7mm x 575-615 mm;
step two, softening and annealing by adopting a natural gas bright bell-type furnace, and charging: the steel strip in the first step is stacked on a furnace table in a delta shape, and an inner container is buckled; heating: covering a heating cover, and heating to 680 ℃ at a heating rate of 85 ℃/h; and (3) heat preservation: preserving heat at 680 ℃ for 18 hours; air cooling: lifting away the heating cover, cooling to 580 ℃ along with the furnace, fastening the cooling cover for air cooling for 4h, lifting away the cooling cover when the temperature in the furnace is reduced to 320 ℃, and cooling along with the furnace; air cooling: when the temperature of the coil falls to 100 ℃, hanging away the liner, and performing air cooling; discharging: and discharging when the air cooling is carried out to room temperature.
Step three, rolling: and (3) conveying the steel strip in the second step to an HC rolling mill for 4-pass rolling, wherein rolling reduction is distributed to be 0.7 mm-0.50 mm-0.35 mm-0.25 mm-0.20 mm, and all flat rollers are adopted in the rolling process, and the plate type is regulated by drawing through an intermediate roller.
Step four, rewinding: and (3) conveying the steel belt in the step three to a recoiling machine set for unreeling so as to remove the tension of the coil generated in the rolling process.
Step five, stress relief annealing: an electric heating hood-type bright annealing furnace is adopted. Charging: stacking the steel strip single coil in the fourth step onto a furnace table, buckling an inner container, and introducing high-hydrogen protective gas; heating: covering a heating cover, heating to 480 ℃ at a heating rate of 120 ℃/h, and preserving heat at the temperature for 2h to form a heating platform so as to improve the temperature uniformity in the furnace; then continuously heating, and heating to 650 ℃ at a heating rate of 85 ℃/h; and (3) heat preservation: preserving heat at 650 ℃ for 16 hours; air cooling: lifting away the heating cover, cooling to 500 ℃ along with the furnace, fastening the cooling cover for air cooling for 4h, lifting away the cooling cover when the temperature in the furnace is reduced to 280 ℃, and cooling along with the furnace; air cooling: when the temperature of the coil falls to 80 ℃, hanging away the liner, and performing air cooling; discharging: and discharging when the air cooling is carried out to room temperature.
Step six, withdrawal and straightening: and (3) conveying the steel belt in the fifth step to a drawing and straightening unit for drawing and straightening by adopting double bending and double straightening.
Step seven, slitting: and D, conveying the steel belt in the step six to a slitting machine set for edge cutting or slitting into narrow strips.
Step eight, checking, packaging and warehousing: and D, inspecting the steel belt in the step seven, and packaging and warehousing after the steel belt is inspected to be qualified.
According to the above embodiment, further, after the liner is fastened in the second step, high hydrogen shielding gas is introduced.
The cold-rolled steel strip produced by the production method reduces the yield strength through the withdrawal straightening, is plastic deformation, and cannot deform the product due to disappearance of external force, and the stamping rate is reduced to about three thousandths from about ten thousandths before.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (2)
1. The production method of the ultrathin cold-rolled steel strip for the clothes is characterized by comprising the following steps of:
step one, selecting raw materials: selecting a steel belt with the specification of 0.7mm x 575-0.7 x 615mm;
step two, softening and annealing: the softening annealing adopts a natural gas bright bell-type furnace, and specifically comprises the following steps:
charging: the steel belt in the first step is put on a furnace table in a delta-shaped mode, and a liner I is buckled;
heating: covering a heating cover I, and heating to 670 ℃ at a heating rate of 80 ℃/h;
and (3) heat preservation: preserving heat at 670 ℃ for 17 hours;
air cooling: lifting away the first heating cover, cooling to 580 ℃ along with the furnace, buckling the first cooling cover, performing air cooling, and cooling for 4 hours, wherein when the temperature in the furnace is reduced to 320 ℃, the first cooling cover is lifted away and cooled along with the furnace;
air cooling: when the temperature of the steel belt is reduced to 100 ℃, hanging away the first liner, and performing air cooling;
discharging: discharging when the air cooling is carried out to room temperature;
step three, rolling: conveying the steel strip in the second step to an HC rolling mill for 4-pass rolling, wherein rolling reduction is sequentially 0.7mm, 0.50mm, 0.35mm, 0.25mm and 0.20mm, and all flat rollers are adopted in the rolling process, and the plate type is regulated by drawing through an intermediate roller;
step four, rewinding: conveying the steel belt in the third step to a rewinding unit for unreeling;
step five, stress relief annealing, adopting an electric heating hood-type bright annealing furnace, specifically comprising the following steps,
charging: stacking the steel strip single coil in the fourth step onto a furnace table, buckling a second liner, and introducing high-hydrogen protective gas; heating: covering a heating cover II, heating to 480 ℃ at a heating rate of 120 ℃/h, and preserving heat for 2h at the temperature; then continuously heating, and heating to 650 ℃ at a heating rate of 80 ℃/h;
and (3) heat preservation: preserving heat at 650 ℃ for 16 hours;
air cooling: lifting the second heating cover, cooling to 500 ℃ along with the furnace, fastening the first cooling cover for air cooling, and lifting the second cooling cover when the temperature in the furnace is reduced to 280 ℃ for 4h and cooling along with the furnace;
air cooling: when the temperature of the steel coil is reduced to 80 ℃, hanging away the second liner, and performing air cooling;
discharging: discharging when the air cooling is carried out to room temperature;
step six, withdrawal and straightening: conveying the steel belt in the fifth step to a drawing and straightening unit for drawing and straightening by adopting double bending and double straightening;
step seven, slitting: conveying the steel belt in the step six to a slitting machine set for edge cutting or slitting into narrow strips;
step eight, checking, packaging and warehousing: and D, inspecting the steel belt in the step seven, and packaging and warehousing after the steel belt is inspected to be qualified.
2. The method of producing ultra-thin cold-rolled steel strip for apparel according to claim 1, wherein the step two is performed after the liner one is fastened, and high hydrogen protective gas is introduced.
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| CN202110838501.7A CN113578962B (en) | 2021-07-23 | 2021-07-23 | Production method of ultrathin cold-rolled steel strip for clothes |
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| CN113578962B true CN113578962B (en) | 2023-08-04 |
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2021
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| JP2004346361A (en) * | 2003-05-21 | 2004-12-09 | Jfe Steel Kk | Method for producing cold-rolled thin steel strip excellent in deep-drawability, and cold-rolled thin steel strip |
| CN1709597A (en) * | 2005-07-22 | 2005-12-21 | 濮德兴 | High-precision very-thin special-wide cold-rolled steel band and its working process |
| CN1861389A (en) * | 2006-06-13 | 2006-11-15 | 无锡市永鑫精密钢带厂 | High precision composite nickel steel band and its prodn. technique |
| CN203200318U (en) * | 2013-04-18 | 2013-09-18 | 武钢集团昆明钢铁股份有限公司 | Cold rolled titanium tape inert gas protective cover type annealing furnace |
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