CN100560770C - Battery case steel and manufacture method thereof that the plane isotropy is good - Google Patents
Battery case steel and manufacture method thereof that the plane isotropy is good Download PDFInfo
- Publication number
- CN100560770C CN100560770C CNB2005100301546A CN200510030154A CN100560770C CN 100560770 C CN100560770 C CN 100560770C CN B2005100301546 A CNB2005100301546 A CN B2005100301546A CN 200510030154 A CN200510030154 A CN 200510030154A CN 100560770 C CN100560770 C CN 100560770C
- Authority
- CN
- China
- Prior art keywords
- battery case
- steel
- temperature
- manufacture method
- good
- 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
Landscapes
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The present invention relates to a kind of battery steel shell steel and manufacture method thereof.Mainly solve plane anisotropic big, secondary work embrittlement resistance relatively poor, the production cost more high defective of existing battery case with the steel existence.The battery case steel that plane of the present invention isotropy is good, the weight percent of its chemical element moiety is: C: Si≤0.01～0.05% :≤0.03%, Mn:0.10～0.50%, P: S≤0.02% :≤0.015%, Al:0.01～0.10%, N:0.002～0.007%, Ti:0.005～0.02%, all the other are iron and inevitably are mingled with.Manufacture method may further comprise the steps: hot metal pretreatment, converter smelting, furnace rear refining, hot rolling, pickling, cold rolling, bell-type annealing, smooth, finishing finished product volume, it is characterized in that: Heating temperature :≤1270 ℃, finishing temperature: 860～930 ℃, coiling temperature :≤640 ℃; Cold rolling reduction is controlled at 75%～90%, the cover annealing temperature: 650～800 ℃; Other routinely technology carry out.Product is used for after the electronickelling punching press or directly strikes out battery case.
Description
Technical field:
The present invention relates to a kind of battery case steel and manufacture method thereof, particularly a kind of good battery case steel and manufacture method thereof of plane isotropy that is used to make TunePower and dry type battery case.
Background technology:
Battery case is mainly used in the box hat of punching out dry type battery and TunePower with cold-rolled steel strip.Battery case becomes battery case with steel band with the punch press punching out, by attenuate or not the attenuate punching out become the battery case product that defectives such as crackle, trachoma, snow must not be arranged, and require plane isotropy good (system ear little) and anti-interior compressive strain.For this to the steel band material require to have high cleanliness, high ductibility, great surface quality, low Δ r value, can carry out deep-drawing such as attenuate and not produce cracking, snowflake spot defect.Before the present invention, " battery case steel band and the manufacture method thereof as thin as a wafer " that CN1401807A is arranged, this patent application adopts Ultra-low carbon Nb-Ti-IF steel to produce the battery case steel, but this type of steel grade is compared with middle carbon aluminium-killed steel, owing to need carbonization treatment, alloy to add more, therefore production cost is higher, and secondary work embrittlement resistance is relatively poor, and in-plane anisotropy (Δ r value) is bigger.There is some battery case producer to adopt general aluminium killed steel punching out battery case again, owing to do not pass through the special control of composition, tissue, the easy chap of material grains and cementite, the surface easily produces " snow " defective and punch process cracking, influence the visual appearance and the use of battery case, and in-plane anisotropy is bigger, not only the ears or side handles of a utensil can appear in the battery case of punching out, and the battery case internal stress of punching out is big, and reduction is low.
Summary of the invention:
The purpose of this invention is to provide a kind of battery case steel with good plane isotropy, deep drawing quality, anti-secondary processing embrittlement and great surface quality, the weight percent of its chemical element moiety is:
C：≤0.01~0.05％
Si：≤0.03％
Mn：0.10~0.50％
P：≤0.02％
S：≤0.015％
Al：0.01~0.10％
N：0.002~0.007％
Ti：0.005~0.02％
All the other are iron and unavoidable impurities.
Battery case steel making method,, hot rolling concise behind hot metal pretreatment, converter smelting, stove, pickling, cold rolling, cover annealing, finishing finished product volume by the said ratio material.Controlling hot rolling wherein: Heating temperature :≤1270 ℃, finishing temperature: 860～930 ℃, coiling temperature :≤640 ℃; Cold rolling reduction is controlled at 75%～90%, the cover annealing temperature: 650～800 ℃; Other routinely technology carry out.The performance that obtains product is: yield strength: 〉=220Mpa, and hardness: HR30T:45 ~ 55, in-plane anisotropy: | Δ r|≤0.3.
Composition design of the present invention and controlling of production process principle are: because battery case is with being used for TunePower and disposable dry type battery, cell internal pressure is bigger, good to the material requirements deep drawability, resistance to pressure (yield strength is higher), the system ear is little, the surface does not have ' snow ', be mingled with, characteristics such as the secondary processing embrittlement temperature is low, according to characteristic and the requirement of battery case with steel, key design one cover chemical ingredients, hot rolling, cold rolling, annealed technology is reaching certain material pressworkability and good surface quality, so steel grades control principle of the present invention is as follows:
C: because C exists with the form of interstitial atom and cementite in material, in steel, has very strong strengthening effect, because dress solution has certain pressure in the battery, the low battery case that causes easily of intensity is out of shape, therefore need keep a certain amount of carbon in material improves intensity, the embrittlement of the secondary of the weak easily generation of the too low grain-boundary strength of carbon simultaneously, and the Ar3 temperature is improved, easily at the rolling generation mixed grain structure of two-phase region, but carbon is the high-ductility variation too, can produce a large amount of cementites and separate out, bring out cracking, deep drawability is descended at crystal boundary.Therefore C control should be in 0.01% ~ 0.05% scope.
Si: the element that silicon improves the strength of materials, but Si produces the SiO of low melting point easily when hot rolling
2.FeO the iron scale of eutectic system, be difficult to remove with high pressure water in hot rolling, thereby remain in the iron scale that takes on a red color on the hot-rolled steel sheet, this iron scale is deep is engaged in and is difficult to pickling on the hot-rolled steel sheet and washes off, thereby it is bad to produce cold rolling surface quality, influence the outward appearance of battery case, even cause stamping cracking, so Si is controlled at below 0.03% as far as possible.
Mn:Mn is the same with C to be the strengthening element of material, suitably adds the raising that a small amount of Mn helps intensity in material, add simultaneously a small amount of Mn can with S in conjunction with generating MnS, it is hot-short to reduce the surface, avoids surface quality problems; But it is too much unfavorable to punch process to add, so Mn should be controlled at 0.10 ~ 0.50%.
The low more processibility of P, S:P, S is good more, and P can improve the intensity of material, but P can cause the fragility of material, S is a harmful element to material, can produce inclusion, influence the toughness of material, particularly unfavorable in the flange of later process and so on secondary workability, solidity to corrosion to battery case.So it is low that the content of P, S will be tried one's best.General P is controlled at below 0.020%; S is controlled at below 0.015%.
Al:Al adds in when steel-making as reductor, increases less than inclusion in 0.01% o'clock molten steel, particularly SiO
2Inclusion increase, cause poor processability, the addition effect greater than 0.1% is saturated substantially.
Ti:Ti in little Ti steel material mainly the form with TiN etc. separate out, in austenite and ferrite, precipitate, hinder grain growth, can avoid coarse-grain and mixed crystal, make the battery case outward appearance not have the snowflake spot defect, make tinyization of cementite precipitate simultaneously, can reduce the possibility that cracks owing to cementite, the too high processibility to material of Ti is unfavorable.The present invention adopts little Ti to handle, because Ti to crystal grain-growth and recrystallize inhibition, can access very low Δ r value, so Ti of the present invention is controlled in 0.005 ~ 0.02% scope.
N: nitrogen and titanizing close the precipitate that forms TiN play strengthening material effect and N in conjunction with after effective Ti the strength of materials is had a significant effect, adding under the situation of Ti in a subtle way, Ti is certain, N is high, and effectively Ti is low, the strength of materials rises.So N is controlled at 20 ~ 70ppm, promptly 0.002 ~ 0.007%.
Steel grade of the present invention is made slab through continuous casting, then carries out hot rolling. and the hot rolling technology control principle is as follows:
1), hot rolling finishing temperature: hot rolling finishing temperature adopts and is higher than Ar
3Temperature be rolled, the too high iron scale that is easy to generate of finishing temperature, cross that low to enter two-phase region rolling, material structure can produce mixed crystal, thereby can produce the snowflake spot defect at the punching out battery case, influence the visual appearance of battery case, unfavorable to the isotropy of material simultaneously, so finishing temperature generally be controlled at 860 ℃ ~ 930 ℃ relatively good.
2), coiling temperature: if coiling temperature during greater than 640 ℃, precipitate is thick easily, causes yield strength low, coiling temperature is too high simultaneously, be easy to generate iron scale and avoid coarse-grain, cause surface imperfection in the punch process process, thus coiling temperature be controlled at≤640 ℃.
The cold-rolling process control principle is as follows:
1), deflection: the increase along with deflection under bigger deflection can reduce Δ r, but the increase of deflection can increase rolling difficulty, and Δ r deflection negative value is unfavorable to punching press simultaneously, so rolling reduction is controlled at about 75～90%.
2) annealing temperature: annealing temperature is bigger to the pressworkability influence, and too low yield strength is too high, unit elongation is on the low side for annealing temperature, the punch process variation.But it is on the low side that annealing temperature is crossed high strength, and Δ r increases, and influences the usability of battery case, so the annealing temperature span of control is at 650 ~ 800 ℃.
The invention has the beneficial effects as follows: steel grade of the present invention has characteristics such as good isotropy, deep drawing quality, great surface quality.The present invention need not carbonization treatment, less, the employing bell furnace production of adding alloy, and production cost is lower, superior in quality, production is stable, is fit to all kinds of producers suitability for industrialized production.
Description of drawings:
Fig. 1 adds the plain body tissue of ferrotianium metallograph for the present invention
Fig. 2 organizes metallograph for the present invention adds the titanium cementite
Fig. 3 adds the influence figure of titanium to Δ r for the present invention
Fig. 4 is the influence figure of cold rolling reduction of the present invention to Δ r
Embodiment:
Three embodiment of the present invention and a comparative example see the following form 1:
The technology controlling and process of embodiment A is: controlling hot rolling: Heating temperature≤1270 ℃, and finishing temperature is 870 ℃, coiling temperature is 640 ℃; Cold rolling reduction is 76%, 650 ℃ of bell-type annealing temperature.As seen the material structure crystal grain that adds behind the Ti from Fig. 1, Fig. 2 is tiny, and cementite is also tiny.Tiny crystal grain not only can battery case attractive in appearance outward appearance, and can improve the secondary workability that resembles flange and so on.Fig. 1 is ferritic structure (an ASTM standard: 11 grades), and Fig. 2 is the cementite tissue.As shown in Figure 3, the increase Δ r value along with Ti under the carbon aluminium-killed steel situation descends, but adds too much Ti, and the decline of Δ r value too much becomes negative value and also is unfavorable for punch process.See Fig. 4, the increase along with deflection under bigger deflection can reduce Δ r.
The technology controlling and process of Embodiment B is: controlling hot rolling: Heating temperature :≤1270 ℃, and finishing temperature: 920 ℃, coiling temperature: 540 ℃; Cold rolling reduction is 82%, 670 ℃ of bell-type annealing temperature.
The technology controlling and process of Embodiment C is: controlling hot rolling: Heating temperature :≤1270 ℃, and finishing temperature: 890 ℃, coiling temperature: 600 ℃; Cold rolling reduction is 87%, 730 ℃ of bell-type annealing temperature.
Hardness in the table 1 and tensile property adopt general GB standard testing.
Claims (1)
1: the battery case steel that a kind of plane isotropy is good, the weight percent of its chemical element moiety is: C:0.01～0.05%, Si :≤0.03%, Mn:0.10 ~ 0.50%, P :≤0.02%, S :≤0.015%, Al:0.01 ~ 0.10%, N:0.002 ~ 0.007%, Ti:0.005 ~ 0.02%, all the other are iron and inevitably are mingled with; This battery case obtains by following steps with steel: hot metal pretreatment, converter smelting, furnace rear refining, hot rolling, pickling, cold rolling, cover annealing, smooth, finishing become the finished product volume, hot rolling Heating temperature≤1270 ℃, finishing temperature is controlled at 860～930 ℃, coiling temperature≤640 ℃; Cold rolling reduction is controlled at 75%～90%, and the cover annealing temperature is controlled at 650～800 ℃; Battery case steel yield strength: 〉=220Mpa, hardness: HR30T:45 ~ 55, in-plane anisotropy: | Δ r|≤0.3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100301546A CN100560770C (en) | 2005-09-29 | 2005-09-29 | Battery case steel and manufacture method thereof that the plane isotropy is good |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100301546A CN100560770C (en) | 2005-09-29 | 2005-09-29 | Battery case steel and manufacture method thereof that the plane isotropy is good |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1940109A CN1940109A (en) | 2007-04-04 |
| CN100560770C true CN100560770C (en) | 2009-11-18 |
Family
ID=37958631
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100301546A Active CN100560770C (en) | 2005-09-29 | 2005-09-29 | Battery case steel and manufacture method thereof that the plane isotropy is good |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100560770C (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101353754B (en) * | 2007-07-23 | 2011-03-30 | 宝山钢铁股份有限公司 | Steel for internal magnetic shield and manufacturing method thereof |
| CN101514425B (en) * | 2008-02-21 | 2011-05-11 | 宝山钢铁股份有限公司 | Yield strength 160MPa grade building earthquake-resistance low-yield strength steel and method for producing same |
| CN101993988B (en) * | 2009-08-25 | 2012-07-18 | 鞍钢股份有限公司 | Method for producing ultrathin ultra-deep stamping cold-rolled sheet by vertical continuous annealing furnace |
| CN102234736A (en) * | 2010-04-22 | 2011-11-09 | 宝山钢铁股份有限公司 | Secondary cold-rolled high-hardness stamping steel with high isotropy and manufacturing method thereof |
| CN102021270B (en) * | 2010-12-15 | 2013-02-27 | 山西太钢不锈钢股份有限公司 | Method for improving isotropy of alloy constructional steel |
| CN106148803B (en) * | 2016-08-30 | 2017-11-24 | 唐山钢铁集团有限责任公司 | A kind of production method of deep-draw battery case steel |
| CN107177731A (en) * | 2017-05-18 | 2017-09-19 | 永鑫精密材料（无锡）有限公司 | A kind of charging battery jar deep-draw cold-rolled strip and its preparation method and application |
| CN108346759A (en) * | 2017-12-28 | 2018-07-31 | 江苏海德森能源有限公司 | A kind of lithium battery of high intensity and preparation method thereof |
| CN110541123B (en) * | 2019-09-05 | 2021-06-15 | 首钢集团有限公司 | Cold-rolled strip steel for battery case and preparation method thereof |
| CN110935789B (en) * | 2019-12-12 | 2021-12-24 | 武汉市杰精精密电子有限公司 | Process for stretching and punching flanging hole on lithium zinc battery shell and punching device thereof |
| CN113930664B (en) * | 2020-06-29 | 2023-04-11 | 宝山钢铁股份有限公司 | High-purity battery case steel and manufacturing method thereof |
| CN115852243B (en) * | 2021-09-24 | 2024-07-12 | 宝山钢铁股份有限公司 | Nickel-plated battery case steel with high corrosion resistance and heat resistance and manufacturing method thereof |
| CN115558855B (en) * | 2022-09-29 | 2023-11-24 | 马鞍山钢铁股份有限公司 | Cold-rolled sheet for battery shell by hood-type annealing and production method thereof |
-
2005
- 2005-09-29 CN CNB2005100301546A patent/CN100560770C/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN1940109A (en) | 2007-04-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100560770C (en) | Battery case steel and manufacture method thereof that the plane isotropy is good | |
| CN109504900B (en) | Ultrahigh-strength cold-rolled phase-change induced plasticity steel and preparation method thereof | |
| CN103060678B (en) | A kind of warm-working nanometer austenite strengthens plasticising steel and preparation method thereof | |
| CN101168826B (en) | High-performance low-carbon bainite structural steel and production method thereof | |
| CN101643828B (en) | Production method of anti-aging tinning black plate | |
| CN111074140B (en) | Method for manufacturing cold-rolled low-carbon enamel steel for household appliances | |
| CN102041437B (en) | 160mm-thick Q345E-Z35 steel plate for high-rise buildings and production method thereof | |
| CN101748339B (en) | High-strength ferritic stainless steel band and manufacturing method thereof | |
| CN100507053C (en) | 800MPa cold rolled and hot zinc plated double phase steel and its producing method | |
| CN102080183A (en) | Q345GJ series structural steel plates for ultra-thick building and production method thereof | |
| CN102011047A (en) | Production method of steel plate for pressure vessel with low cost and high performance | |
| CN102061424A (en) | Super-thick Q390GJC-Z35 steel plate for high-rise buildings and production method thereof | |
| CN110923550A (en) | Hot-rolled structural steel with high surface quality, high strength and toughness produced by adopting short process and production method | |
| CN102234736A (en) | Secondary cold-rolled high-hardness stamping steel with high isotropy and manufacturing method thereof | |
| CN101928876A (en) | TRIP/TWIP high-strength plastic automobile steel with excellent processability and preparation method thereof | |
| CN110284070A (en) | A kind of 260MPa rank hot rolling acid-cleaning glassed steel and its production method | |
| CN102286699B (en) | Corrosion-resistant steel with impact molding rate not smaller than 150 per minute for cell shell and preparation method thereof | |
| CN107868908A (en) | A kind of deep-draw two-sided dust coat cold rolling glassed steel and production method | |
| CN105925896A (en) | 1000 MPa-grade high-strength and high-plasticity hot-rolled steel plate and manufacturing method thereof | |
| CN102747301B (en) | High-strength stainless steel cold-rolled sheet strip and manufacturing method thereof | |
| CN102586683A (en) | Ni-series low-temperature steel, manufacture method thereof, liquefied natural gas storage tank and ship body for transportation ship | |
| CN105200329A (en) | Tensile strength-700MPa level easy-to-weld low-internal-stress structural steel plate and manufacturing method thereof | |
| CN110343970A (en) | A kind of hot rolling high strength and ductility medium managese steel and preparation method thereof having lower Mn content | |
| JP3845554B2 (en) | Super high strength cold-rolled steel sheet with excellent bending workability | |
| CN108690939A (en) | A kind of high forming nitrogenous austenitic stainless steel and its manufacturing method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |