CN114058817A - Production method of cold-rolled deep-drawing steel with thickness of 3.0mm - Google Patents
Production method of cold-rolled deep-drawing steel with thickness of 3.0mm Download PDFInfo
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- CN114058817A CN114058817A CN202111371799.1A CN202111371799A CN114058817A CN 114058817 A CN114058817 A CN 114058817A CN 202111371799 A CN202111371799 A CN 202111371799A CN 114058817 A CN114058817 A CN 114058817A
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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
- 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
- C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
- C21D8/0421—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the working steps
- C21D8/0436—Cold rolling
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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
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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
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
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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
- 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
- C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
- C21D8/0421—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the working steps
- C21D8/0442—Flattening; Dressing; Flexing
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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
- 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
- C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
- C21D8/0447—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the heat treatment
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Metal Rolling (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention discloses a method for producing deep drawing steel with the thickness of 3.0mm, wherein the thickness of 3.0mm is the limit specification of a cold-rolled product, a continuous annealing production line can only produce the maximum thickness of 2.5mm, the invention utilizes a hot-rolled raw material of the deep drawing steel, the production process flow comprises a 5-frame cold continuous rolling process, a cleaning process, a cover type annealing process, a leveling process and a re-coiling process, and the mechanical property value meeting the standard is obtained through cold rolling, a reasonable cover type annealing process and a leveling process, so that the stamping and strength requirements of users on the material are met.
Description
Technical Field
The invention relates to the field of cold-rolled deep-drawing steel (in particular to the technical field of the limit thickness of deep-drawing steel), and particularly relates to a production method of cold-rolled deep-drawing steel with the thickness of 3.0 mm.
Background
The cold-rolled deep-drawing steel with the limit thickness of 3.0mm has certain market demands, for example, the cold-rolled deep-drawing steel is used in the fields of mechanical parts (engine guard plates and automobile parts), buildings (structural parts), seals (flanges), smelting alloy containers and the like, the raw materials are required to have good stamping performance, surface quality and anti-aging performance, and the cold-rolled deep-drawing steel cannot be replaced by products such as hot-rolled, pickled plates and cold-rolled low-carbon steel.
In most domestic cold rolling continuous annealing production lines, the maximum thickness of deep drawing steel can be only 2.5 mm. For the bell-type annealing production line, the maximum thickness of the raw material required by the acid rolling production line is 6.0mm, and the reduction rate of the acid rolling is only 50% when the finished product with the thickness of 3.0mm is rolled, while the high reduction of the acid rolling is a prerequisite guarantee for obtaining good stamping performance. Under the condition of the existing reduction rate, the key control technology is to realize the good stamping performance and strength offline of the product. Meanwhile, the yield platform, the surface cleanliness, the plate shape and the surface roughness of the product are also controlled.
Disclosure of Invention
The invention aims to provide a production method of cold-rolled deep-drawing steel with the thickness of 3.0mm, and solves the problem.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention relates to a production method of 3.0mm thick cold-rolled deep-drawing steel, wherein a hot-rolled raw material is subjected to a cold rolling process, a cleaning process, a cover annealing process, a leveling process and a rewinding process to obtain a 3.0mm thick deep-drawing steel finished product; the method specifically comprises the following steps:
the cold rolling process comprises the steps of cutting off the head and the tail of the raw material, welding, straightening, pickling, rinsing, drying, trimming, cold continuous rolling and coiling;
in the cold continuous rolling process, the rolling mill adopts 5 frames for continuous arrangement, and the roller system consists of a working roller, a middle roller and a supporting roller; the range of the surface roughness Ra of the working roll is as follows: 1.8-4.5 μm, 5 frame total reduction rate of 50%, and coiling tension of 38-42N/mm2The rolled product is a cold-hard roll with the thickness of 3.0 mm;
the cleaning process comprises the steps of carrying out degreasing treatment on rolling oil, ash and iron powder impurities remained on the surface of the steel strip in the modes of alkali washing, electrolysis, rinsing and drying;
the cover annealing process adopts a one-stage or two-stage heating mode, the initial heat preservation platform temperature of the two-stage heating is 500-600 ℃, the heating rate is less than or equal to 60 ℃/h, the heat preservation temperature is 710-750 ℃, the heat preservation time is 10-18 h, and the slow cooling time is 4-6 h;
the steel rolling in the leveling process adopts an elongation control mode, the elongation is set to be 0.6-1.0%, the plate shape is controlled through bending rollers and leveling, air blowing is arranged, and the pressure is more than or equal to 5.5 bar.
The re-coiling process comprises a withdrawal and straightening machine, wherein the elongation rate is set to be 0.1-0.8%, and the double-sided oiling amount is 600-1000 mg/m2。
Further, the mechanical property range of the obtained deep-drawing steel coil with the thickness of 3.0mm is as follows: the yield strength is 120-150 MPa, the tensile strength is 260-280 MPa, the elongation A80 is 45% -56%, the n value is 0.19-0.23, and the r value is 1.3-2.0.
Furthermore, in the cold rolling procedure, hydrochloric acid with the concentration of free acid being more than 160% is adopted for acid cleaning, the acid cleaning temperature is 80-90 ℃, the acid cleaning speed is less than or equal to 120m/min, the straightening elongation is 1.0-1.5%, and the straightening and acid cleaning aims at removing the iron oxide scale on the surface of the strip steel.
Furthermore, the middle roller is a CVC transverse shifting roller, the shifting amount is +/-120 mm, and the roller diameter of the working roller is 420-470 mm; spraying emulsion to a roller and a steel strip deformation area during rolling for process lubrication and cooling, wherein the concentration of the emulsion is 0.5-3.0%, the temperature range of the emulsion is 50-60 ℃, the shape of a steel strip plate is adjusted by controlling the hole shape of a working roller through a CVC roller shifting roller and a bending roller, and a rolled product is a chilled roll with the thickness of 3.0 mm.
Furthermore, in the cleaning procedure, the conductivity of the alkali liquor is 30-45 ms/cm, the conductivity of the electrolyte is 20-35 ms/cm, the temperature of the alkali liquor is 60-80 ℃, and the brush roll current of the alkali brush and water brush roll is 11.0-15.0A.
Furthermore, in the hood-type annealing process, the hydrogen flow rate in the temperature rise section is 30m3/h～40m3H, hydrogen flow rate of 20m in heat preservation section3/h～30m3H; spraying water to the inner cover to rapidly cool the inner cover to 380 ℃, removing the inner temperature of the inner cover to be less than or equal to 95 ℃, and placing the discharged steel coil on a final cooling platform to cool the steel coil to room temperature.
Compared with the prior art, the invention has the beneficial technical effects that:
the invention adopts a cover type annealing mode, expands the upper limit of the maximum thickness specification of 2.5mm of continuous annealing production, the maximum thickness of the cold-rolled deep-drawing steel reaches 3.0mm, the deep-drawing steel product with the thickness has application in a plurality of fields of mechanical manufacture, automobile parts and the like, and some products are manufactured by machine processing modes of turning, milling and the like.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
In the following examples, the process flow is: hot rolling raw materials, cold continuous rolling, cleaning, cover annealing, leveling, recoiling and obtaining finished products.
Example 1:
the Ti-series hot rolling raw material coil comprises the following chemical components in percentage by weight: c: 0.002%, Si: 0.01%, Mn: 0.10%, P: 0.020%, S: 0.008%, Als: 0.045%, Ti: 0.054%, N: 0.0025 percent, and the balance of Fe and inevitable impurity elements.
The Ti-series ultra-low carbon hot rolled coil with the thickness of 6.0mm is adopted as a raw material for producing deep drawing steel with the thickness of 3.0mm, the raw material is subjected to head and tail cutting, welding, straightening and drawing and pickling treatment, the concentration of free hydrochloric acid in the pickling process is 180 percent, the pickling temperature is 85 ℃, the pickling speed is 90m/min, the straightening and drawing elongation rate is 1.2 percent, the raw material is rolled by a 5-stand cold continuous rolling mill set, the thickness of a finished product is 3.0mm, the surface roughness Ra of a working roll is 2.0 mu m, the total reduction rate of 5 stands is 50 percent, and the coiling tension is 38N/mm2When rolling, the concentration of the emulsion is 2.7% in the front 4 stands, 0.5% in the end stands and 55 ℃ at the emulsion temperature.
And (3) cleaning the chilled coil, wherein the conductivity of the alkali liquor is 42ms/cm, the conductivity of the electrolyte is 28ms/cm, the temperature of the alkali liquor is 70 ℃, and the brush roller current of the alkali brush and water brush rollers is 13.0A.
The annealing process adopts a one-stage heating mode, the heating rate is 55 ℃/h, and the hydrogen flow rate in the heating stage is 30m3H, the heat preservation temperature is 720 ℃, the heat preservation time is 12h, and the hydrogen flow in the heat preservation section is 20m3And h, slow cooling period time is 4 h.
And rolling the annealed steel coil by a temper mill, wherein the concentration of the temper rolling liquid is 4.5%, the elongation is set to be 0.8%, and the air blowing pressure is 5.5 bar. Finally, small rolls are cut through the rewinding process, the elongation is set to be 0.2 percent, and the double-sided oiling amount is 300mg/m2。
The mechanical properties of the deep-drawing steel coil with the thickness of 3.0mm obtained by the method are as follows: yield strength: 145MPa, tensile strength: 278MPa, elongation (a 80): 48%, n value: 0.21, r value: 1.78.
example 2:
the Ti + Nb series hot rolling raw material coil comprises the following chemical components in percentage by weight: c: 0.0015%, Si: 0.01%, Mn: 0.13%, P: 0.018%, S: 0.001%, Als: 0.05%, Ti: 0.04%, Nb: 0.02%, N: 0.0018 percent, and the balance of Fe and inevitable impurity elements.
The Ti + Nb series ultra-low carbon hot rolled coil with the thickness of 6.0mm is adopted as a raw material for producing deep drawing steel with the thickness of 3.0mm, and the raw material is subjected to head and tail cutting, welding, pulling and straightening and pickling treatment, wherein the concentration of free hydrochloric acid in the pickling process is 200 percent, the pickling temperature is 90 ℃, and the pickling speed is 110m/min, a withdrawal and straightening elongation of 1.3%, and rolling by a 5-stand cold continuous rolling mill to obtain a chilled coil with a thickness of 3.0mm, wherein the surface roughness Ra of a working roll is 1.9 mu m, the total reduction rate of the 5 stands is 50%, and the coiling tension is 40N/mm2When rolling, the concentration of the emulsion is 2.9% in the front 4 stands, 0.65% in the end stands and 60 ℃ at the emulsion temperature.
And cleaning the chilled coil, wherein the conductivity of the alkali liquor is 38ms/cm, the conductivity of the electrolyte is 25ms/cm, the temperature of the alkali liquor is 65 ℃, and the brush roller current of the alkali brush and water brush rollers is 13.0A.
The annealing process adopts a two-stage heating mode, the temperature of an initial heat-preservation platform is 500 ℃, the heating rate is 50 ℃/h, and the hydrogen flow rate of a heating section is 35m3H, the heat preservation temperature is 730 ℃, the heat preservation time is 15h, and the hydrogen flow in the heat preservation section is 26m3And h, the slow cooling period is 6 h.
And rolling the annealed steel coil by a temper mill, wherein the concentration of the temper rolling liquid is 4.8%, the elongation is set to be 0.9%, and the air blowing pressure is 5.8 bar. Finally, small rolls are cut through the rewinding process, the elongation is set to be 0.3 percent, and the double-sided oiling amount is 300mg/m2。
The mechanical properties of the deep-drawing steel coil with the thickness of 3.0mm obtained by the method are as follows: yield strength: 138MPa, tensile strength: 273MPa, elongation (a 80): 50%, n value: 0.21, r value: 2.02.
the above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (6)
1. A production method of cold-rolled deep-drawing steel with the thickness of 3.0mm is characterized by comprising the following steps: the hot rolling raw material is subjected to a cold rolling process, a cleaning process, a cover annealing process, a leveling process and a rewinding process to obtain a deep drawing steel finished product with the thickness of 3.0 mm; the method specifically comprises the following steps:
the cold rolling process comprises the steps of cutting off the head and the tail of the raw material, welding, straightening, pickling, rinsing, drying, trimming, cold continuous rolling and coiling;
in the cold continuous rolling process, the rolling mill adopts 5 frames for continuous arrangement, and the roller system consists of a working roller, a middle roller and a supporting roller; the range of the surface roughness Ra of the working roll is as follows: 1.8-4.5 μm, 5 frame total reduction rate of 50%, and coiling tension of 38-42N/mm2The rolled product is a cold-hard roll with the thickness of 3.0 mm;
the cleaning process comprises the steps of carrying out degreasing treatment on rolling oil, ash and iron powder impurities remained on the surface of the steel strip in the modes of alkali washing, electrolysis, rinsing and drying;
the cover annealing process adopts a one-stage or two-stage heating mode, the initial heat preservation platform temperature of the two-stage heating is 500-600 ℃, the heating rate is less than or equal to 60 ℃/h, the heat preservation temperature is 710-750 ℃, the heat preservation time is 10-18 h, and the slow cooling time is 4-6 h;
the steel rolling in the leveling process adopts an elongation control mode, the elongation is set to be 0.6-1.0%, the plate shape is controlled through bending rollers and leveling, air blowing is arranged, and the pressure is more than or equal to 5.5 bar;
the re-coiling process comprises a withdrawal and straightening machine, wherein the elongation rate is set to be 0.1-0.8%, and the double-sided oiling amount is 600-1000 mg/m2。
2. Method for producing cold-rolled deep-drawing steel with a thickness of 3.0mm according to claim 1, characterised in that: the mechanical property range of the obtained deep drawing steel coil with the thickness of 3.0mm is as follows: the yield strength is 120-150 MPa, the tensile strength is 260-280 MPa, the elongation A80 is 45% -56%, the n value is 0.19-0.23, and the r value is 1.3-2.0.
3. Method for producing cold-rolled deep-drawing steel with a thickness of 3.0mm according to claim 1, characterised in that: in the cold rolling procedure, hydrochloric acid with the concentration of free acid being more than 160% is adopted for acid cleaning, the acid cleaning temperature is 80-90 ℃, the acid cleaning speed is less than or equal to 120m/min, the withdrawal and straightening elongation is 1.0-1.5%, and the withdrawal, straightening and acid cleaning aim at removing the iron scale on the surface of the strip steel.
4. Method for producing cold-rolled deep-drawing steel with a thickness of 3.0mm according to claim 1, characterised in that: the middle roller is a CVC transverse shifting roller, the shifting amount is +/-120 mm, and the roller diameter of the working roller is 420-470 mm; spraying emulsion to a roller and a steel strip deformation area during rolling for process lubrication and cooling, wherein the concentration of the emulsion is 0.5-3.0%, the temperature range of the emulsion is 50-60 ℃, the shape of a steel strip plate is adjusted by controlling the hole shape of a working roller through a CVC roller shifting roller and a bending roller, and a rolled product is a chilled roll with the thickness of 3.0 mm.
5. Method for producing cold-rolled deep-drawing steel with a thickness of 3.0mm according to claim 1, characterised in that: in the cleaning procedure, the conductivity of the alkali liquor is 30-45 ms/cm, the conductivity of the electrolyte is 20-35 ms/cm, the temperature of the alkali liquor is 60-80 ℃, and the brush roll current of the alkali brush and water brush roll is 11.0-15.0A.
6. Method for producing cold-rolled deep-drawing steel with a thickness of 3.0mm according to claim 1, characterised in that: in the cover type annealing process, the hydrogen flow rate of the temperature rising section is 30m3/h～40m3H, hydrogen flow rate of 20m in heat preservation section3/h～30m3H; spraying water to the inner cover to rapidly cool the inner cover to 380 ℃, removing the inner temperature of the inner cover to be less than or equal to 95 ℃, and placing the discharged steel coil on a final cooling platform to cool the steel coil to room temperature.
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| CN202111371799.1A CN114058817A (en) | 2021-11-18 | 2021-11-18 | Production method of cold-rolled deep-drawing steel with thickness of 3.0mm |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114525391A (en) * | 2022-02-22 | 2022-05-24 | 湖南华菱涟源钢铁有限公司 | Production process of high-carbon tool steel cold-rolled coil |
| CN114558904A (en) * | 2022-03-22 | 2022-05-31 | 新疆八一钢铁股份有限公司 | Cold rolling and cover annealing process of deep-drawing Ti-IF steel |
| CN114561530A (en) * | 2022-03-21 | 2022-05-31 | 包头钢铁（集团）有限责任公司 | Preparation method of low-carbon steel plate for manufacturing portable fire extinguisher |
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| CN105624559A (en) * | 2014-10-25 | 2016-06-01 | 上海梅山钢铁股份有限公司 | Thick-gauge ultra-deep drawing cold rolled steel plate and manufacturing method thereof |
| CN105463321A (en) * | 2015-12-08 | 2016-04-06 | 武汉钢铁(集团)公司 | Batch annealing process plane isotropy steel and manufacturing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114525391A (en) * | 2022-02-22 | 2022-05-24 | 湖南华菱涟源钢铁有限公司 | Production process of high-carbon tool steel cold-rolled coil |
| CN114525391B (en) * | 2022-02-22 | 2024-03-22 | 湖南华菱涟源钢铁有限公司 | Production process of high-carbon tool steel cold-rolled sheet |
| CN114561530A (en) * | 2022-03-21 | 2022-05-31 | 包头钢铁（集团）有限责任公司 | Preparation method of low-carbon steel plate for manufacturing portable fire extinguisher |
| CN114561530B (en) * | 2022-03-21 | 2024-03-08 | 包头钢铁（集团）有限责任公司 | Preparation method of low-carbon steel plate for manufacturing portable fire extinguisher |
| CN114558904A (en) * | 2022-03-22 | 2022-05-31 | 新疆八一钢铁股份有限公司 | Cold rolling and cover annealing process of deep-drawing Ti-IF steel |
| CN114558904B (en) * | 2022-03-22 | 2022-12-30 | 新疆八一钢铁股份有限公司 | Cold rolling and cover annealing process of deep drawing Ti-IF steel |
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