CN110541123B - Cold-rolled strip steel for battery case and preparation method thereof - Google Patents
Cold-rolled strip steel for battery case and preparation method thereof Download PDFInfo
- Publication number
- CN110541123B CN110541123B CN201910840477.3A CN201910840477A CN110541123B CN 110541123 B CN110541123 B CN 110541123B CN 201910840477 A CN201910840477 A CN 201910840477A CN 110541123 B CN110541123 B CN 110541123B
- Authority
- CN
- China
- Prior art keywords
- equal
- percent
- rolling
- less
- steel
- 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.)
- Active
Links
Images
Classifications
-
- 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
-
- 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
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- 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
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/663—Bell-type furnaces
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- 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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- 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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- 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
-
- 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
-
- 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
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/003—Cementite
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
Landscapes
- 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)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention relates to a cold-rolled strip steel for battery cases and a preparation method thereof, belonging to the technical field of new materials, and the cold-rolled strip steel for the battery cases provided by the embodiment of the invention comprises the following chemical components in percentage by weight: c is more than or equal to 0.03 percent and less than or equal to 0.06 percent, Si is more than or equal to 0.03 percent, Mn is more than or equal to 0.25 percent and less than or equal to 0.15 percent, P is less than or equal to 0.012 percent, S is less than or equal to 0.010 percent, Cr is more than or equal to 0.03 percent and less than or equal to 0.05 percent, B is more than or equal to 0.0004 percent and less than or equal to 0.0008 percent, Alt is more than or equal to 0.06 percent and less than or equal to 0.09 percent, N is less than or equal.
Description
Technical Field
The invention belongs to the technical field of new materials, and particularly relates to a cold-rolled strip steel for a battery case and a preparation method thereof.
Background
The steel for the battery steel shell is mainly used for producing high-end alkaline battery steel shells and rechargeable battery steel shells, is a precision cold-rolled strip steel with extremely high quality requirements, and the punching process generally comprises 7-10 times of stretching and thinning, so that strict requirements are provided for various technical indexes such as purity, anisotropy, performance uniformity, dimensional precision, surface quality and the like of the strip steel. Because of harsh processing conditions, the current steel for battery cases in China mainly depends on foreign import, so the development of the steel for battery cases, which has low cost and can reach various technical indexes, is urgently needed in the field.
Chinese patent CN1940109A adopts low-carbon components to produce the steel for the battery case with excellent plane isotropy, and the main chemical component ranges are as follows: c (percent) is more than or equal to 0.01 and less than or equal to 0.05, Si (percent) is more than or equal to 0.03, Mn (percent) is more than or equal to 0.1 and less than or equal to 0.5, P (percent) is more than or equal to 0.02, S (percent) is more than or equal to 0.015, Alt (percent) is more than or equal to 0.01 and less than or equal to 0.10, Ti (percent) is more than or equal to 0.005 and less than or equal to 0.020, N (percent) is more than or equal to 0.002 and less than or equal to 0.007, and the anisotropy index delta r is less than 0.3, thereby. The patent document does not make a clear explanation about the key index of the purity of the steel grade, namely the inclusion control level, and the defect of 'sand holes' caused by large-size inclusions exists in the actual punching process.
Chinese patent CN102286699A adopts ultra-low carbon components to produce steel for battery cases with the stamping speed more than or equal to 150 per minute, and the main chemical component ranges are as follows: c ((%) is more than or equal to 0.0001 and less than or equal to 0.0050, Mn ((%) is more than or equal to 0.10 and less than or equal to 0.20, Al ((%) is more than or equal to 0.01 and less than or equal to 0.05, N ((%) is more than or equal to 0.0001 and less than or equal to 0.0040, Nb ((%)) is more than or equal to 0.010 and less than or equal to 0.030, and controlling: p (%) < 0.020, S (%) < 0.015, Cu (%) < 0.05, Ni (%) < 0.05, Cr (%) < 0.08, Mo (%) < 0.05, Si (%) < 0.02. The nitrogen content is less than or equal to 30ppm, the size of the inclusion is less than or equal to 10 mu m, the yield ratio is less than or equal to 0.6, and the anisotropy index delta r is less than 0.3, so that the requirement of rapid processing and forming of a high-speed punch press can be met. The patent document adopts ultra-low carbon component design, so that the smelting cost is increased, and the cover type annealing adopts a high-temperature annealing process at 700 ℃, so that the bonding risk is increased, and the improvement of the surface quality of a finished product is not facilitated.
The patent (No. CN109136444A) adopts ultra-low carbon components to produce the steel for the battery case of the new energy automobile which is quickly and thinly stamped, and the steel mainly comprises the following chemical components in percentage by weight: c (percent) is more than or equal to 0.003 and less than or equal to 0.005, Mn (percent) is more than or equal to 0.10 and less than or equal to 0.20, Si (percent) is more than or equal to 0.03, Als (percent) is more than or equal to 0.05 and less than or equal to 0.09, Ti (percent) is more than or equal to 0.050 and less than or equal to 0.070, P (percent) is more than or equal to 0.015, S (percent) is more than or equal to 0.012, and N (percent) is more than or equal to 0.004, and the method. The patent document adopts ultra-low carbon component design, and adopts 700-740 ℃ low-temperature two-phase region annealing in the subsequent Continuous Annealing (CA) process to obtain an incomplete annealing structure, and the two-phase region annealing process involved in the patent is relatively unfavorable for realizing the precise control of the microstructure and the high performance uniformity of coil passing.
Disclosure of Invention
In view of the above problems, the present invention has been made to provide a cold rolled steel strip for battery cases and a method for manufacturing the same, which overcome the above problems or at least partially solve the above problems.
The embodiment of the invention provides a cold-rolled strip steel for a battery case, which comprises the following chemical components in percentage by weight: c is more than or equal to 0.03 percent and less than or equal to 0.06 percent, Si is more than or equal to 0.03 percent, Mn is more than or equal to 0.25 percent and less than or equal to 0.15 percent, P is less than or equal to 0.012 percent, S is less than or equal to 0.010 percent, Cr is more than or equal to 0.03 percent and less than or equal to 0.05 percent, B is more than or equal to 0.0004 percent and less than or equal to 0.0008 percent, Alt is more than or equal to 0.06 percent and less than or equal to 0.09 percent, N is less than or equal.
Further, the metallographic structure of the steel is ferrite and free cementite.
Further, the ferrite content is more than or equal to 95 percent, and the balance is free cementite according to volume percentage. .
Furthermore, the grain size of the ferrite is 10.0-11.0 grade, and the average size of the inclusions is less than 20 mu m.
Further, the thickness of the steel is 0.30-0.50 mm.
Based on the same invention concept, the embodiment of the invention also provides a preparation method of the cold-rolled strip steel for the battery case, which comprises the working procedures of smelting, continuous casting, casting blank heating, hot rolling, acid rolling, cover annealing and flattening;
in the smelting, molten steel components are prepared according to the steel chemical components, and a KR-LD-RH-CC process is adopted;
the continuous casting drawing speed is 1.2-1.4 m/min;
in the process of heating the casting blank, the discharging temperature of the casting blank is 1180-1220 ℃;
in the hot rolling, the final rolling temperature is 850-890 ℃, and the hot rolling convexity is 20-60 mu m;
in the acid rolling, the total rolling reduction rate of the cold rolling is 82-89%;
in the cover annealing, the hot spot temperature is 650-660 ℃, and the cold spot temperature is 600-610 ℃;
the flat elongation is 0.9-1.1%.
Further, in the smelting, the rare earth wire feeding of the crystallizer is carried out, and the rare earth addition mass is 100-200g/t molten steel.
Furthermore, coiling is carried out after the hot rolling is finished, and the coiling temperature is 560-600 ℃.
Further, the acid rolling adopts five machine frames for continuous rolling, 1-3# machine frames in the five machine frames adopt intermediate roll shifting, and the intermediate roll shifting UC-delta is 25 mm.
Furthermore, in the hood-type annealing, the soaking time is 10-12 h.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
according to the cold-rolled strip steel for the battery case and the preparation method thereof provided by the embodiment of the invention, through steel chemical component control and preparation technology, the yield strength Rel is more than or equal to 200 and less than or equal to 230MPa, the tensile strength Rm is more than or equal to 330 and less than or equal to 360MPa, and the elongation percentage A is obtained50The strip steel for the cold-rolled battery case has the anisotropy delta r less than 0.30 and is more than or equal to 36.0 percent.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a metallographic structure diagram of steel for a battery case in example 1 of the invention;
FIG. 2 is a diagram showing inclusions in steel for battery cases in example 1 of the present invention;
FIG. 3 is a metallographic structure diagram of steel for a battery case in example 2 of the invention;
FIG. 4 is a diagram showing inclusions in steel for battery cases in example 2 of the present invention;
FIG. 5 is a metallographic structure diagram of steel for a battery case in example 3 of the invention;
FIG. 6 is a drawing showing inclusions in steel for battery cases in example 3 of the present invention;
FIG. 7 is a metallographic structure diagram of steel for a battery case in example 4 of the invention;
FIG. 8 is a drawing showing inclusions in steel for battery cases in example 4 of the present invention;
FIG. 9 is a metallographic structure diagram of steel for a battery case in example 5 of the invention;
FIG. 10 is a diagram showing inclusions in steel for battery cases in example 5 of the present invention.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that these specific embodiments and examples are for the purpose of illustrating the invention and are not to be construed as limiting the invention.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
In order to solve the technical problems, the general idea of the embodiment of the application is as follows:
the application provides a cold-rolled strip steel for battery cases, which comprises the following chemical components in percentage by weight: c is more than or equal to 0.03 percent and less than or equal to 0.06 percent, Si is more than or equal to 0.03 percent, Mn is more than or equal to 0.25 percent and less than or equal to 0.15 percent, P is less than or equal to 0.012 percent, S is less than or equal to 0.010 percent, Cr is more than or equal to 0.03 percent and less than or equal to 0.05 percent, B is more than or equal to 0.0004 percent and less than or equal to 0.0008 percent, Alt is more than or equal to 0.06 percent and less than or equal to 0.09 percent, N is less than or equal.
In the present application, the metallographic structure of the steel is ferrite and free cementite.
In the application, the ferrite content is more than or equal to 95 percent, and the balance is free cementite according to volume percentage. .
In the application, the grain size of the ferrite is 10.0-11.0 grade, and the average size of the inclusions is less than 20 mu m.
In the present application, the thickness of the steel is 0.30-0.50 mm.
Based on the same invention concept, the embodiment of the invention also provides a preparation method of the cold-rolled strip steel for the battery case, which comprises the working procedures of smelting, continuous casting, casting blank heating, hot rolling, acid rolling, cover annealing and flattening;
in the smelting, molten steel components are prepared according to the steel chemical components, and a KR-LD-RH-CC process is adopted;
the continuous casting drawing speed is 1.2-1.4 m/min;
in the process of heating the casting blank, the discharging temperature of the casting blank is 1180-1220 ℃;
in the hot rolling, the final rolling temperature is 850-890 ℃, and the hot rolling convexity is 20-60 mu m;
in the acid rolling, the total rolling reduction rate of the cold rolling is 82-89%;
in the cover annealing, the hot spot temperature is 650-660 ℃, and the cold spot temperature is 600-610 ℃;
the flat elongation is 0.9-1.1%.
In the application, in the smelting, the rare earth wire feeding of the crystallizer is carried out, and the rare earth addition mass is 100-200g/t molten steel.
In the application, coiling is carried out after the hot rolling is finished, and the coiling temperature is 560-600 ℃.
In the application, the acid rolling adopts five-stand continuous rolling, 1-3# stand in five stands adopts middle roller to scurry the roller, middle roller scurry roller volume UC-delta sets for 25 mm.
In the present application, the soaking time in the hood-type annealing is 10 to 12 hours.
In the present application, acid rolling is a collective term for pickling and cold rolling processes.
In the embodiment of the invention, the steel has the following chemical component elements:
c: c is an important element for ensuring the required strength of the steel for the battery shell, the carbon content is too low, the strength of the strip steel is not enough, and the requirement on the compressive strength of the battery shell cannot be met. The carbon content is too high, a great amount of carbide precipitates in ferrite grain boundaries and crystal grains, and the interface of the carbide and the parent phase is often the initiation point of micro-cracks in the punching and drawing process, so that the punching performance is deteriorated. In order to ensure the stamping forming performance of the steel material for the battery shell and the basic strength requirement of the shell, the content of the C element is limited to 0.03-0.06.
Si: si has a certain strengthening effect, excessive Si may deteriorate the platability of Ni, and the Si content is limited to 0.03 or less in the present invention.
Mn: mn can play a role in solid solution strengthening so as to improve the strength of the steel, and can promote S in the steel to precipitate and separate out in a MnS form. Mn is not favorable for improving the corrosion resistance of the shell and the platability of the Ni plating layer, and the content of Mn element is controlled to be 0.15-0.25 on the premise of fully playing the solid solution strengthening and S fixing functions of Mn.
And (3) Alt: al is mainly used for fixing N in steel, and the aging performance of the battery case steel can be improved. Al and N in the steel are combined to form AIN, so that {111} texture can be obtained in the annealing process, and the stamping forming performance of the battery case steel is improved. The present invention limits the Al content to the range of 0.06-0.09.
Cr: the tiny cracks formed between the steel surface grains and between the carbide and the matrix in the battery case punching and drawing process tend to accelerate the corrosion of the surface of the case, and the addition of more than 0.03 percent of Cr in the steel can remarkably inhibit the corrosion resistance deterioration of the case caused by the surface damage in the punching process. The steel for battery cases is often subjected to Ni plating treatment before or after punching, and excessively high Cr in the steel tends to promote the formation of a dense Cr oxide film on the surface of the base material, resulting in deterioration of the platability of the Ni plating layer. In order to take the corrosion resistance of the shell and the platability of the Ni coating into consideration, the Cr content in the steel is limited to 0.03-0.05.
B: b can improve the binding force between ferrite grains and between carbide and a matrix and inhibit the expansion of microcracks in the drawing process. The addition of 0.0003% or more of B to steel improves the work embrittlement accompanying the ironing, and the strength of steel increases significantly when the B content exceeds 0.0015%, and the B/N ratio in steel increases when the B content is too high, and in particular, when the B/N content exceeds 1.0, the material anisotropy increases and the press-forming earing ratio increases. In order to improve the punching formability, the content of B in the steel is limited to 0.0004-0.0008.
N: the nitrogen dissolved in the gaps in the steel often causes the strength and the hardness of the steel to be improved, the plasticity is reduced, the punching forming is not favorable, the content of N in the battery case steel is required to be as low as possible, and the content of N is limited to be less than or equal to 0.003.
P: p has a serious segregation tendency, which often causes the strip structure in steel to be aggravated, the plasticity and the toughness of the steel to be reduced, the forming performance to be deteriorated, and the platability of Ni to be deteriorated due to the over-high content of P, and the content of P is limited to be less than or equal to 0.0012.
S: s is a harmful impurity element in steel, a sulfide inclusion in the steel often becomes a stress source during stamping cracking, the content of S in the battery case steel is strictly controlled, and the content of S is limited to be less than or equal to 0.012.
In the embodiment of the invention, the preparation method of the cold-rolled strip steel for the battery case mainly comprises the following steps:
smelting: the smelting process adopts a production process of KR-LD-RH-CC, the rare earth wire feeding treatment of a crystallizer is carried out, the mark of rare earth RECe-48 is obtained, the addition amount of the rare earth is controlled at 200g/t, the continuous casting drawing speed is controlled at 1.2-1.4m/min, and the casting blank obtained by smelting is subjected to hot rolling after being subjected to the peeling treatment by a four-side machine.
Hot rolling: the hot rolling is finished in an austenite region, the tapping temperature of the plate blank is controlled to be 1180-1220 ℃, the finishing temperature is controlled to be 850-890 ℃, and the coiling temperature is controlled to be 560-600 ℃ by adopting a low-temperature coiling process. In order to ensure the dimensional accuracy of the subsequent cold-rolled finished product, the hot-rolling convexity is controlled to be 20-60 mu m.
Acid rolling (acid pickling and cold rolling): and (3) adopting an acid rolling combined unit, or pickling firstly and then carrying out cold continuous rolling or multiple reversible cold rolling. When the acid rolling is five-stand continuous rolling, the total reduction rate is controlled to be 82-89%, the acid rolling 1# -3# stand adopts intermediate roll shifting, and the intermediate roll shifting UC-delta is set to be 25 mm. .
Hood annealing (BA): after the steel coil is subjected to electrolytic degreasing, recrystallization annealing is carried out by adopting a full-hydrogen type hood-type annealing furnace, the temperature of a hot spot of the hood-type annealing is controlled to be 650-660 ℃, the temperature of a cold spot is controlled to be 600-610 ℃, and the soaking time is controlled to be 10-12 h. The cover annealing (BA) process promotes the full development of main texture components {111} < 110>, {111} < 112> and the like in the annealing process, reduces the anisotropy of materials, and reduces the occurrence of lug making defects in the stamping process.
Leveling by a double-machine frame: the flatness of the strip steel after recrystallization annealing can better improve the plate shape of the cold-rolled strip steel and improve the dimensional precision of the cold-rolled strip steel. The battery case steel is flattened by adopting the double-frame after annealing, and the total elongation of the flattening is controlled within 0.9-1.1% to meet the design requirement of product quality.
The cold rolled steel strip for battery cases of the present application will be described in detail with reference to specific examples.
The chemical composition (Wt%) of the steel in examples 1 to 5 described below is shown in Table 1.
TABLE 1
| Examples | C(％) | Si(％) | Mn(％) | P(％) | S(％) | Alt(％) | Cr(％) | B(％) | N(％) | 0(％) |
| Example 1 | 0.06 | 0.01 | 0.15 | 0.008 | 0.006 | 0.06 | 0.04 | 0.0005 | 0.002 | 0.002 |
| Example 2 | 0.04 | 0.02 | 0.2 | 0.007 | 0.005 | 0.08 | 0.03 | 0.0007 | 0.0018 | 0.0022 |
| Example 3 | 0.03 | 0.01 | 0.22 | 0.006 | 0.009 | 0.07 | 0.04 | 0.0006 | 0.0019 | 0.0018 |
| Example 4 | 0.04 | 0.01 | 0.14 | 0.008 | 0.005 | 0.06 | 0.04 | 0.0004 | 0.0017 | 0.0016 |
| Example 5 | 0.03 | 0.02 | 0.25 | 0.006 | 0.008 | 0.09 | 0.05 | 0.0008 | 0.0025 | 0.0022 |
The main rolling process parameters in examples 1-5 below are shown in table 2.
TABLE 2
| Examples | Tapping temperature (. degree. C.) | Finish Rolling temperature (. degree.C.) | Coiling temperature (. degree.C.) | Cold rolling reduction (%) |
| Example 1 | 1210 | 875 | 572 | 84 |
| Example 2 | 1200 | 886 | 585 | 87 |
| Example 3 | 1220 | 877 | 579 | 89 |
| Example 4 | 1180 | 881 | 580 | 82 |
| Example 5 | 1198 | 879 | 582 | 85 |
The annealing and planarization process parameters for examples 1-5 below are shown in table 3.
TABLE 3
| Examples | Hotspot temperature (. degree.C.) | Cold Point temperature (. degree. C.) | Soaking time (h) | Flat elongation (%) |
| Example 1 | 650 | 602 | 12 | 1.1 |
| Example 2 | 652 | 600 | 10 | 1.0 |
| Example 3 | 659 | 610 | 12 | 1.1 |
| Example 4 | 653 | 604 | 11 | 0.9 |
| Example 5 | 660 | 607 | 12 | 1.0 |
Example 1
In the embodiment, a KR-LD-RH-CC production process is adopted in the smelting process, the rare earth wire feeding treatment is carried out on the crystallizer, the rare earth mark REce-48 is adopted, the addition amount of the rare earth is controlled to be 180g/t, the continuous casting drawing speed is controlled to be 1.2m/min, and the chemical components of the plate blank are shown in the embodiment 1 in the attached table 1.
The four-side surface cleaning and peeling treatment of the continuous casting billet is carried out, after the hot rolling, the heating, the rough rolling, the finish rolling, the layer cooling and the coiling, the cold rolling plate is produced by an acid pickling and cold continuous rolling unit, the hot rolling convexity is 40 mu m, a No. 1-3 stand of the acid rolling adopts a middle roller shifting, the middle roller shifting UC-delta is set to be 25mm, and the specific process parameters are shown in the embodiment 1 of the attached table 2.
The cold-rolled strip steel is recrystallized and annealed in an all-hydrogen cover annealing furnace, and then is leveled by a double-rack after the annealing is finished, wherein the annealing and leveling process parameters are shown in the attached table 3, example 1.
The finished product coil after flattening is detected to have mechanical properties in three directions of rolling direction, 45 degrees and transverse direction, and the actual performance of the mechanical properties is shown in the embodiment 1 of the attached table 4.
The grain size of the steel for the battery case produced by the embodiment is controlled to be 10.5 grade, the average size of inclusions is controlled to be 5 mu m, the transverse thickness difference CW10 is controlled to be 6 mu m, the performance of the finished product is stable, the steel is successfully applied to a battery case punching production line, and no obvious defects such as sand holes, cracking, wrinkling and the like are seen in the using process.
Example 2
In the embodiment, a KR-LD-RH-CC production process is adopted in the smelting process, the rare earth wire feeding treatment is carried out on the crystallizer, the rare earth mark RECe-48 is adopted, the rare earth amount is controlled to be 120g/t, the continuous casting drawing speed is controlled to be 1.4m/min, and the chemical components of the plate blank are shown in the embodiment 2 in the attached table 1.
The four-side surface cleaning and peeling treatment of the continuous casting billet is carried out, after the hot rolling, the heating, the rough rolling, the finish rolling, the layer cooling and the coiling, the cold rolled plate is produced by an acid pickling and cold continuous rolling unit, the hot rolling convexity is 30 mu m, a No. 1-3 stand of the acid rolling adopts a middle roller shifting, the middle roller shifting UC-delta is set to be 25mm, and the specific process is shown in the embodiment 2 of the attached table 2.
The cold-rolled strip steel is recrystallized and annealed in an all-hydrogen cover annealing furnace, and then is leveled by a double-rack after the annealing is finished, wherein the annealing and leveling process parameters are shown in the embodiment 2 of the attached table 3.
The finished product coil after flattening is detected to have mechanical properties in three directions of rolling direction, 45 degrees and transverse direction, and the actual performance of the mechanical properties is shown in the embodiment 2 of the attached table 4.
The grain size of the steel for the battery case produced by the embodiment is controlled to be 10.0 grade, the average size of inclusions is controlled to be 4 microns, the transverse thickness difference CW10 is controlled to be 5 microns, the performance of the finished product is stable, the steel is successfully applied to a battery case punching production line, and no obvious defects such as sand holes, cracking, wrinkling and the like are seen in the using process.
Example 3
In the embodiment, a KR-LD-RH-CC production process is adopted in the smelting process, the rare earth wire feeding treatment is carried out on the crystallizer, the mark of the rare earth RECe-48 is adopted, the addition of the rare earth is controlled to be 100g/t, the continuous casting drawing speed is controlled to be 1.3m/min, and the chemical components of the plate blank are shown in the embodiment 3 in the attached table 1.
The four-side surface cleaning and peeling treatment of the continuous casting billet is carried out, after the hot rolling, the heating, the rough rolling, the finish rolling, the layer cooling and the coiling, the cold rolled plate is produced by an acid pickling and cold continuous rolling unit, the hot rolling convexity is 58 mu m, a No. 1-3 stand of the acid rolling adopts a middle roller shifting, the middle roller shifting UC-delta is set to be 25mm, and the specific process is shown in the embodiment 3 of the attached table 2.
The cold-rolled strip steel is recrystallized and annealed in an all-hydrogen cover annealing furnace, and then is leveled by a double-rack after the annealing is finished, wherein the annealing and leveling process parameters are shown in the embodiment 3 of the attached table 3.
The finished product coil after flattening is detected to have mechanical properties in three directions of rolling direction, 45 degrees and transverse direction, and the actual performance of the mechanical properties is shown in the embodiment 3 of the attached table 4.
The grain size of the steel for the battery case produced by the embodiment is controlled to be 11.0 grade, the average size of inclusions is controlled to be 6 microns, the transverse thickness difference CW10 is controlled to be 7 microns, the performance of the finished product is stable, the steel is successfully applied to a battery case punching production line, and no obvious defects such as sand holes, cracking, wrinkling and the like are seen in the using process.
Example 4
In the embodiment, a KR-LD-RH-CC production process is adopted in the smelting process, the rare earth wire feeding treatment is carried out on the crystallizer, the grade of the rare earth RECe-48 is controlled, the addition of the rare earth is controlled to be 200g/t, the continuous casting speed is controlled to be 1.3m/min, and the chemical composition table of a plate blank is shown in the embodiment 4 in the attached table 1.
The four-side surface cleaning and peeling treatment of the continuous casting billet is carried out, after the hot rolling, the heating, the rough rolling, the finish rolling, the layer cooling and the coiling, the cold rolling plate is produced by an acid pickling and cold continuous rolling unit, the hot rolling convexity is 28 mu m, a No. 1-3 stand of the acid rolling adopts a middle roller shifting amount UC-delta which is set to be 25mm, and the specific process is shown in an embodiment 4 of an attached table 2.
The cold-rolled strip steel is recrystallized and annealed in an all-hydrogen cover annealing furnace, and then is leveled by a double-rack after the annealing is finished, wherein the annealing and leveling process parameters are shown in the embodiment 4 of the attached table 3.
The finished product coil after flattening is detected in mechanical properties in three directions of rolling direction, 45 degrees and transverse direction, and the actual performance of the mechanical properties is shown in embodiment 4 of the attached table 4.
The grain size of the steel for the battery case produced by the embodiment is controlled to be 10.5 grade, the average size of inclusions is controlled to be 5 mu m, the transverse thickness difference CW10 is controlled to be 5 mu m, the performance of the finished product is stable, the steel is successfully applied to a battery case punching production line, and no obvious defects such as sand holes, cracking, wrinkling and the like are seen in the using process.
Example 5
In the embodiment, a KR-LD-RH-CC production process is adopted in the smelting process, the rare earth wire feeding treatment is carried out on the crystallizer, the grade of the rare earth RECe-48 is controlled, the addition of the rare earth is controlled to be 100g/t, the continuous casting drawing speed is controlled to be 1.2m/min, and the chemical components of a plate blank are shown in an embodiment 5 in an attached table 1.
The four-side surface cleaning and peeling treatment of the continuous casting billet is carried out, after the hot rolling, the heating, the rough rolling, the finish rolling, the layer cooling and the coiling, the cold rolling plate is produced by an acid pickling and cold continuous rolling unit, the hot rolling convexity is 50 mu m, a No. 1-3 stand of the acid rolling adopts a middle roller shifting, the middle roller shifting UC-delta is set to be 25mm, and the specific process parameters are shown in an embodiment 5 of an attached table 2.
The cold-rolled strip steel is recrystallized and annealed in an all-hydrogen cover annealing furnace, and then is leveled by a double-rack after the annealing is finished, wherein the annealing and leveling process parameters are shown in the attached table 3 and example 5.
The finished product coil after flattening is detected to have mechanical properties in three directions of rolling direction, 45 degrees and transverse direction, and the actual performance of the mechanical properties is shown in the embodiment 5 of the attached table 4.
The grain size of the steel for the battery case produced by the embodiment is controlled to be 10.0 grade, the average size of inclusions is controlled to be 5 mu m, the transverse thickness difference CW10 is controlled to be 6 mu m, the performance of the finished product is stable, the steel is successfully applied to a battery case punching production line, and no obvious defects such as sand holes, cracking, wrinkling and the like are seen in the using process.
The steels for battery cases obtained in the above examples 1 to 5 were subjected to the performance test, and the test results are shown in table 4.
TABLE 4
Finally, it should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (1)
1. The preparation method of the cold-rolled strip steel for the battery case is characterized in that the steel comprises the following chemical components: c is more than or equal to 0.03 percent and less than or equal to 0.06 percent, Si is more than or equal to 0.03 percent, Mn is more than or equal to 0.25 percent and less than or equal to 0.15 percent and less than or equal to 0.25 percent, P is less than or equal to 0.012 percent, S is less than or equal to 0.010 percent, Cr is more than or equal to 0.03 percent and less than or equal to 0.05 percent, B is more than or equal to 0.0004 percent and less than or equal to 0.0008 percent, Alt is more than or equal to 0.06 percent and less than or equal to 0.09 percent, N is less than or equal to 0.003 percent and less than or equal to 0.0025 percent, and the balance of Fe and inevitable impurity elements, wherein the metallographic structure of the steel is ferrite and free cementite, the,
the preparation method sequentially comprises the working procedures of smelting, continuous casting, casting blank heating, hot rolling, acid rolling, cover annealing and leveling; the smelting process adopts a production process of 'KR-LD-RH-CC', the rare earth wire feeding treatment of a crystallizer is carried out, hot rolling is carried out in an austenite region phase region to finish rolling, acid rolling comprises pickling and cold rolling, an acid rolling combined unit is adopted, or pickling is carried out firstly, then cold continuous rolling or multiple reversible cold rolling is carried out, a steel coil after cold rolling is subjected to electrolytic degreasing and then recrystallization annealing is carried out by adopting a full-hydrogen cover type annealing furnace, and the steel coil is leveled by adopting a double-frame after annealing;
the continuous casting drawing speed is 1.2-1.4 m/min;
in the process of heating the casting blank, the discharging temperature of the casting blank is 1180-1220 ℃;
in the hot rolling, the final rolling temperature is 850-890 ℃, and the hot rolling convexity is 20-60 mu m;
in the acid rolling, the total rolling reduction rate of the cold rolling is 82-89%;
in the cover annealing, the hot spot temperature is 650-660 ℃, and the cold spot temperature is 600-610 ℃;
the leveling elongation rate is 0.9-1.1%, in the smelting process, the rare earth wire feeding treatment is carried out on a crystallizer, the rare earth addition mass is 200g/t of molten steel, after the hot rolling is finished, coiling is carried out, the coiling temperature is 560-600 ℃, the acid rolling adopts five frames for continuous rolling, 1-3# frames in the five frames adopt intermediate roll shifting, the intermediate roll shifting UC-delta is 25mm, and in the cover annealing process, the soaking time is 10-12 h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910840477.3A CN110541123B (en) | 2019-09-05 | 2019-09-05 | Cold-rolled strip steel for battery case and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910840477.3A CN110541123B (en) | 2019-09-05 | 2019-09-05 | Cold-rolled strip steel for battery case and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110541123A CN110541123A (en) | 2019-12-06 |
| CN110541123B true CN110541123B (en) | 2021-06-15 |
Family
ID=68712799
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910840477.3A Active CN110541123B (en) | 2019-09-05 | 2019-09-05 | Cold-rolled strip steel for battery case and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110541123B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09241759A (en) * | 1996-03-08 | 1997-09-16 | Nkk Corp | Production of steel sheet for external cylinder of battery, excellent in material uniformity and corrosion resistance |
| JP2002088446A (en) * | 2000-09-12 | 2002-03-27 | Toyo Kohan Co Ltd | Steel sheet for forming outer cylinder of battery having excellent anisotropy and its production method |
| WO2010113333A1 (en) * | 2009-04-02 | 2010-10-07 | Ｊｆｅスチール株式会社 | Steel sheet for high‑strength container and manufacturing method thereof |
| CN109136444A (en) * | 2018-08-30 | 2019-01-04 | 唐山钢铁集团有限责任公司 | Quickly, the new energy car battery shell steel and production method of punch process is thinned |
| CN109321842A (en) * | 2018-11-01 | 2019-02-12 | 宁波钢铁有限公司 | A kind of batteries of electric automobile clean steel band and preparation method thereof |
| CN110106449A (en) * | 2019-05-31 | 2019-08-09 | 张家港扬子江冷轧板有限公司 | Battery case cold rolling thin steel strip and its production method |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100293169B1 (en) * | 1996-02-08 | 2001-06-15 | 야마오카 요지로 | Steel sheet for two-piece battery can excellent in moldability, secondary work embrittlement resistance, and corrosion resistance |
| JPH09241760A (en) * | 1996-03-08 | 1997-09-16 | Nkk Corp | Production of steel sheet for external cylinder of battery, excellent in material uniformity and corrosion resistance |
| JP3292034B2 (en) * | 1996-03-08 | 2002-06-17 | 日本鋼管株式会社 | Manufacturing method of steel sheet for battery outer cylinder with excellent material uniformity and corrosion resistance |
| JP3292033B2 (en) * | 1996-03-08 | 2002-06-17 | 日本鋼管株式会社 | Manufacturing method of steel sheet for battery outer cylinder with excellent material uniformity and corrosion resistance |
| CN1174109C (en) * | 2002-09-20 | 2004-11-03 | 武汉钢铁(集团)公司 | Tagger steel strip for battery casing, and producing method thereof |
| JP4191069B2 (en) * | 2004-03-12 | 2008-12-03 | 日新製鋼株式会社 | Ferritic stainless steel sheet for drawing and ironing and manufacturing method |
| CN100560770C (en) * | 2005-09-29 | 2009-11-18 | 宝山钢铁股份有限公司 | Battery case steel and manufacture method thereof that the plane isotropy is good |
| JP5434212B2 (en) * | 2008-04-11 | 2014-03-05 | Ｊｆｅスチール株式会社 | Steel plate for high-strength container and manufacturing method thereof |
| CN102876971A (en) * | 2012-09-24 | 2013-01-16 | 无锡市方正金属捆带有限公司 | Method for manufacturing nickel-chromium plating steel band for battery steel shell |
| CN105838994B (en) * | 2016-04-26 | 2018-03-06 | 江苏省沙钢钢铁研究院有限公司 | Chrome plating and its manufacture method, crown plug |
| CN108588559A (en) * | 2018-05-17 | 2018-09-28 | 柳州钢铁股份有限公司 | The cold rolling glassed steel of yield strength 230MPa or more |
| CN108342654A (en) * | 2018-05-17 | 2018-07-31 | 柳州钢铁股份有限公司 | The manufacturing method of the cold rolling glassed steel of yield strength 230MPa or more |
| CN108796388B (en) * | 2018-08-06 | 2021-03-23 | 首钢集团有限公司 | Hot-dip galvanized steel plate for color coating and manufacturing method thereof |
| CN109321840A (en) * | 2018-10-24 | 2019-02-12 | 首钢京唐钢铁联合有限责任公司 | A kind of 280MPa level low alloy high-strength steel and its manufacturing method |
| CN109881102A (en) * | 2019-03-19 | 2019-06-14 | 首钢集团有限公司 | A kind of mild steel and its manufacturing method |
-
2019
- 2019-09-05 CN CN201910840477.3A patent/CN110541123B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09241759A (en) * | 1996-03-08 | 1997-09-16 | Nkk Corp | Production of steel sheet for external cylinder of battery, excellent in material uniformity and corrosion resistance |
| JP2002088446A (en) * | 2000-09-12 | 2002-03-27 | Toyo Kohan Co Ltd | Steel sheet for forming outer cylinder of battery having excellent anisotropy and its production method |
| WO2010113333A1 (en) * | 2009-04-02 | 2010-10-07 | Ｊｆｅスチール株式会社 | Steel sheet for high‑strength container and manufacturing method thereof |
| CN109136444A (en) * | 2018-08-30 | 2019-01-04 | 唐山钢铁集团有限责任公司 | Quickly, the new energy car battery shell steel and production method of punch process is thinned |
| CN109321842A (en) * | 2018-11-01 | 2019-02-12 | 宁波钢铁有限公司 | A kind of batteries of electric automobile clean steel band and preparation method thereof |
| CN110106449A (en) * | 2019-05-31 | 2019-08-09 | 张家港扬子江冷轧板有限公司 | Battery case cold rolling thin steel strip and its production method |
Non-Patent Citations (2)
| Title |
|---|
| 包钢电池壳钢的研制;韩玉龙等;《包钢科技》;20180225;第44卷(第1期);全文 * |
| 电池壳用超深冲冷轧带钢生产的改进措施;徐飞;《轧钢》;19960630(第3期);全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110541123A (en) | 2019-12-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP5549414B2 (en) | Cold-rolled thin steel sheet having excellent shape freezing property and manufacturing method thereof | |
| CN112301272B (en) | High-yield steel for one-time cold rolling cover unpacking and preparation method thereof | |
| CN105441795B (en) | A kind of LED lead frame low-carbon cold rolling steel plate and its production method | |
| CN109321839B (en) | 240 MPa-grade bake-hardening steel and manufacturing method thereof | |
| CN113774274B (en) | Low-cost well-formed battery case steel and production method thereof | |
| CN114012056B (en) | 1500 MPa-level hot forming steel and preparation method thereof | |
| JP6037084B2 (en) | Steel plate for squeezed can and method for manufacturing the same | |
| CN102653839A (en) | Low-temperature continuous-annealing interstitial-free atom cold-rolled steel plate and production method thereof | |
| CN109694990A (en) | Light phase transition inducing plasticity steel and its production method with good strong plasticity | |
| CN107012392A (en) | A kind of 600MPa grade high-strengths low-alloy cold-strip steel and its production method | |
| JP5930144B1 (en) | Steel plate for squeezed can and method for manufacturing the same | |
| CN113249646B (en) | High-strength-plasticity hot-base galvanized medium manganese steel sheet and preparation method thereof | |
| CN104651715A (en) | Cold-rolled steel plate, preparation method of cold-rolled steel plate, hot-dip galvanized steel plate, and preparation method of hot-dip galvanized steel plate | |
| CN115505847B (en) | Cold-rolled ultrahigh-strength steel plate with excellent impact property and preparation method thereof | |
| KR101543834B1 (en) | Thin, hot-rolled steel sheet having excellnet workability and anti-aging properties, and method for manufacturing the same | |
| CN110541123B (en) | Cold-rolled strip steel for battery case and preparation method thereof | |
| CN112501513B (en) | Low-carbon acid-pickled steel with excellent formability and surface quality and production method thereof | |
| CN108474084B (en) | Hot-rolled plated steel sheet having excellent workability and method for producing same | |
| CN116254460A (en) | Cold-rolled high-strength weather-resistant steel, preparation process and application thereof | |
| CN109385569B (en) | High-hardness cold-rolled electrotinning steel plate and production method thereof | |
| CN111636031A (en) | Ultra-low carbon bake-hardening steel and production method thereof | |
| CN111763875A (en) | High-hardness cold-rolled electrotinning substrate for bottle cap and production method thereof | |
| EP2431490B1 (en) | Cold-rolled steel sheet with excellent formability, shape retentivity, and surface appearance and process for producing same | |
| KR102484992B1 (en) | Plated steel sheet having excellent strength, formability and surface property and method for manufacturing the same | |
| CN117512304A (en) | Tinning plate for DI (DI) tank and preparation method thereof |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |