CN103469062A - Isotropic cold-rolled soft tinned plate and production method thereof - Google Patents
Isotropic cold-rolled soft tinned plate and production method thereof Download PDFInfo
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Abstract
The invention discloses an isotropic cold-rolled soft tinned plate and a production method thereof. The soft tinned plate comprises a primary plate and a tin coating, wherein the primary plate comprises the following chemical components in percentage by weight: 0.055-0.080% of C, at most 0.02% of Si, 0.55-0.65% of Mn, at most 0.015% of P, at most 0.012% of S, 0.005-0.025% of Als, at most 0.004% of N, and the balance of Fe and inevitable impurities. The production method sequentially comprises the following steps: molten iron desulfurization, converter smelting, RH vacuum treatment, continuous casting, hot continuous rolling, acid washing, cold rolling, electrolytic degreasing, full-hydrogen furnace cover annealing at 650-660 DEG C, flattening and electrotinning, wherein the cold rolling is performed by an HC rolling mill in a five-six pass mode, and the reduction rate is 85-93%. The tinned plate disclosed by the invention has the advantages of isotropy, low hardness value and high corrosion resistance; and the method is simple and convenient, and is low in cost and easy to implement.
Description
Technical field
The invention belongs to the iron and steel technical field, be specifically related to the cold rolling soft tin-plate of a kind of isotropy and production method thereof.
Background technology
For soft tin-plate product requirement plane isotropy and the excellent corrosion resistance of food cans, and there is high cleanliness, high ductibility, great surface quality, low △ r value, do not produce the performances such as cracking while shaping.Wherein isotropy and erosion resistance are the most important performances of soft tin-plate for food cans.The factor that affects soft tin-plate isotropy and erosion resistance has a lot, as raw sheet surface clearness, electroplating technology and soft-melting process etc. before raw sheet composition, cold rolling draft, recrystallization annealing process, plating.
For improving soft tin-plate processing characteristics and erosion resistance for food cans, the researchist has done a large amount of work.For example, (number of patent application: CN200510027290.X) disclose the soft tin-plate of a kind of hardness HR30T within 51 ± 3, its composition is (weight percent): C≤0.005% for the soft tin-plate of the hardness HR30T of the inventions such as Baosteel Li Jun in 51 ± 3 and manufacture method thereof; Mn:0.20～0.30%; Al:0.03～0.06%; Si≤0.03%; Ti:0.03%～0.06%; P≤0.012%; S≤0.015%; N≤0.003%; O≤0.004%; Surplus is Fe and some inevitable impurity elements.Its method comprises the steps: that steel-making → continuous casting → hot rolling → acid rolls associating → continuous annealing → smooth → zinc-plated, the main production parameter is as follows: 1190～1250 ℃ of slab tapping temperatures, 880～920 ℃ of finishing temperatures, coiling temperature is controlled between 560～620 ℃, between 730 ℃～760 ℃ of annealing temperatures, soaking time 25～50s, smooth unit elongation 1.2～2.2%.But this invention is the tin plate that a kind of continuous annealing is produced, and in the substrate composition, C content is low, and has added alloying element Ti, belong to the IF steel, and IF steel temperature when carrying out continuous annealing is high, and wooden dipper song, broken belt easily occur steel band, cause lumber recovery low, and production cost is high.And for example, good zinc-plated former steel plate and the manufacture method (number of patent application: CN201210408099.X) disclose a kind of soft zinc-plated former steel plate and manufacture method thereof thereof of a kind of punching performance of the invention such as Lv Jiashun.The chemical constitution of this steel plate is: C:0.0001～0.010%, and Si≤0.02%, Mn:0.10～0.60%, P≤0.02%, S≤0.02%, Al≤0.02%, N≤0.002%, O≤0.005%, Nb:0.005～0.05% and/or Ti:0.005～0.07%, remaining is Fe.Its technical process is: hot metal pretreatment-converter smelting-external refining-protective casting-hot rolling-pickling and cold-rolling-annealing-inspection-packing; Controlling molten steel terminal oxygen activity during converter smelting is 0.02～0.06%; In the external refining process, molten steel is carried out to vacuum-treat, accurately control the alloying element contents such as C, Mn, the gas contents such as the oxygen in the minimizing molten steel, nitrogen.But in the disclosed substrate composition of this patent, same C content is low, and has added alloy element Nb and/or Ti, belongs to the IF steel, and production cost is high.
In sum, owing to producing soft tin-plate, adopt ultra low-carbon steel, soft steel and/or add Ti, Nb element, production cost is high.
Summary of the invention
The object of the present invention is to provide the cold rolling soft tin-plate of a kind of isotropy with low cost and production method thereof.
For achieving the above object, the cold rolling soft tin-plate of isotropy of the present invention comprises raw sheet and tin coating, the chemical composition of described raw sheet is by weight percentage: C:0.055～0.080%, Si≤0.02%, Mn:0.55～0.65%, P≤0.015%, S≤0.012%, Als:0.005～0.025%, N≤0.004%, all the other are Fe and inevitable impurity.
The cold rolling soft tin-plate production method of isotropy of the present invention comprises the following steps successively: desulfurizing iron, converter smelting, RH vacuum-treat, continuous casting, hot continuous rolling, pickling, and cold rolling, electrolytic degreasing, perhydro bonnet formula (BA) annealing, smooth, eleetrotinplate;
Described cold rolling employing HC milling train carries out 5～6 passage rollings, and draft is 85～93%,
During described perhydro bonnet formula annealing, annealing temperature control is 650～660 ℃.
Further, the annealing time 18～20h in described perhydro bonnet formula annealing process.
The principle that in the starting material steel chemical composition mechanism of selecting in the present invention and production method, every technical parameter limits is as follows:
C:C is the most effective solution strengthening element, and along with the increase of C content, raw steel is hardening gradually, and its cold-forming property (punching press, drawing) and welding property also can variation simultaneously.Due to cementite, for matrix is ferritic carbon steel, be negative electrode, therefore, when in product, C content increases, negative electrode quantity and area have just been increased, correspondingly its corrosion current has also increased, and has caused the product erosion resistance to reduce, and pickling time lag (PL) increases.For guaranteeing punch process and the erosion resistance of tin plate, need to be controlled at the weight percentage of C in 0.055-0.080%.
Si: in tin plate, the content of Si is higher, and the SiO2 content of the oxidized generation of Si increases thereupon.And the SiO2 content on raw steel surface is higher, the adhesivity of coating is just poorer.Therefore, for guaranteeing the erosion resistance of tin plate, need to be controlled at the weight percentage of Si below 0.02%.
Mn: manganese energy reinforced ferrite, the meeting solid solution increases the hardness of tin plate, and in tin plate, the content of Mn is higher, and pickling time lag is just larger, and the erosion resistance of tin plate also can descend.Therefore the present invention controls the weight percentage of Mn for 0.55-0.65%.
Segregation easily occurs in P:P, and causes the reduction of the corrosion resistance nature of steel, so content requirement is low as far as possible, needs the weight percentage of controlling P to be controlled at below 0.015%.
S: in steel, S is the detrimental impurity element, and the erosion resistance of the less steel of content of S is better.Therefore control the weight percentage of S below 0.012%.
The Al that Als: Xiang Gangzhong adds can form sour molten aluminium (Als) and sour insoluble aluminium, and Als comprises solid solution aluminium and AlN, and the AlN particle of disperse can stop growing up of austenite crystal, crystal grain thinning, thus contribute to improve the processing forming of steel plate.But for aluminium killed steel, along with the increase of Als, the Al in steel
2o
3the amount of inclusions increases, and inclusion size also will become greatly, will cause corrosion resisting property and the coating adhesion variation of tin plate, and pickling time lag (PL) value is larger; But in order to guarantee the surface quality of the complete deoxidation of molten steel and continuously cast bloom, the weight percent of Als should guarantee>=0.005%.Therefore the present invention is controlled at Als content in 0.005～0.030%.
N:N is the same with C, is also solid solution element.Along with the increase of N content in steel, will cause its pressworkability to degenerate, simultaneously, solid solution N is the major cause that causes tin plate finished product timeliness, particularly, for the strain aging effect after smooth, the impact of N is especially large, therefore requires N as far as possible low.Concerning tin plate of the present invention, the N content in steel should be controlled at below 0.004%.
The present invention is except containing above-mentioned chemical composition, and surplus is Fe and inevitably is mingled with.
For guaranteeing that soft tin-plate of the present invention has good isotropy and deep drawability and thickness (thickness is 0.20-0.35mm) as thin as a wafer, need carry out heavy reduction rate rolling to the starting material steel.Because deflection is larger, the broken thin degree of crystal grain is larger, and just the more, just the more, the unstable of tissue is just higher for the lattice defects such as dislocation for the amount of subgrain boundary, and during recrystallization annealing, the motivating force of grain growth is also larger.That is to say, cold rolling draft is larger, and crystal grain during recrystallization annealing is more easily grown up.On the one hand, the recrystal grain size is more even, and the isotropy of product is better, | △ r| levels off to 0; And on the other hand, recrystal grain is larger, its grain fineness number is less, and the deep drawability of steel is just better.In sum, the cold rolling draft of tin plate of the present invention is controlled at 85～93% scopes.
Steel plate is after cold rolling, and along with dislocation desity sharply raises, its intensity and hardness is corresponding rapid increase also.For making by cold rolling elongated grain by recrystallize, to recover plasticity, to reduce hardness, obtain stable tissue and performance, the coil of strip after cold rolling need carry out recrystallization annealing through Full Hydrogen Bell Type Annealing Furnace, obtains required mechanical property and the processing characteristics of user.For bell-type annealing, the annealing temperature general control is at 560～720 ℃, and annealing time is controlled at 10～20h, and in this temperature range, annealing temperature is higher, and annealing time is longer, and crystal grain is larger, and grain fineness number is less.But, for bell-type annealing, along with the raising of annealing temperature, easily produce bonding between adjacent coil of strip layer, therefore, annealing temperature can not be too high.In sum, for the recrystal grain degree that makes raw steel of the present invention reaches 7～9 grades, requirement according to soft tin-plate chemical composition of the present invention and finished product hardness value 51 ± 4, the annealing temperature of soft tin-plate of the present invention is controlled at 650～660 ℃, and the annealing time in perhydro bonnet formula annealing process is controlled at 18～20h.
The cold rolled annealed mode of soft tin-plate of the present invention is bell-type annealing, the electrolytic tinplate thickness of producing is 0.20～0.35mm, cold rolling reduction is controlled at 85～93%, hardness level is T-1.5, and hardness value (HR30Tm) is 51 ± 4, tensile strength >=300MPa, unit elongation >=42%, average Erichsen number >=9.1mm, pickling time lag (PL)≤2 second, | △ r|≤0.1.
Tin plate of the present invention has following advantage:
(1) the cold rolling soft tin-plate of the present invention has advantages of that isotropy, hardness value are low, being conducive to the user uses corrosion-resistant tin plate to make deep Drawn Can, and the tank of making is without ear processed, improved user's lumber recovery, but also have advantages of that erosion resistance is strong, is conducive to the corrosion protection of the wrapping material such as food and drink.
(2) production method of the cold rolling soft tin-plate of isotropy of the present invention is used the bell-type annealing mode to produce, and has the production control difficulty little, and cost is low, is easy to the advantage of implementing in large production, is conducive to the user and reduces costs.
Embodiment
Below in conjunction with embodiment, the present invention is further detailed explanation.
Embodiment 1
By the chemical component weight percentage composition, be: C:0.055, Si:0.01, Mn:0.55, P:0.009, S:0.012, Als:0.015, N:0.0025, all the other raw material carbon aluminium-killed steels that are Fe and inevitable impurity are through desulfurizing iron, again after converter smelting, by molten steel through the RH vacuum-treat, then the molten steel after processing is continuously cast into to steel billet, continuous casting steel billet becomes steel band through hot continuous rolling, then hot rolled strip is carried out to pickling, under the condition that is 85% at draft, with the HC milling train carry out cold rolling after, through electrolytic degreasing, Full Hydrogen Bell Type Annealing Furnace annealing (BA) is annealed, perhydro bell-type annealing temperature is 660 ℃, annealing time is 18h, carry out again two-shipper smooth, eleetrotinplate, obtaining thickness is the cold rolling soft tin-plate of 0.25mm.After testing, its grain fineness number is 8 grades, and hardness value (HR30Tm) is 52, and tensile strength is 310MPa, unit elongation 43%, and pickling time lag (PL) is 1.5s, Erichsen number is 9.3mm.| △ r| is 0.05.
Embodiment 2
By the chemical component weight percentage composition, be: C:0.060, Si:0.02, Mn:0.60, P:0.011, S:0.009, Als:0.005, N:0.003, all the other raw material carbon aluminium-killed steels that are Fe and inevitable impurity are through desulfurizing iron, again after converter smelting, by molten steel through the RH vacuum-treat, then the molten steel after processing is continuously cast into to steel billet, continuous casting steel billet becomes steel band through hot continuous rolling, then hot rolled strip is carried out to pickling, under the condition that is 90% at draft, with the HC milling train carry out cold rolling after, through electrolytic degreasing, Full Hydrogen Bell Type Annealing Furnace annealing (BA) is annealed, perhydro bell-type annealing temperature is 655 ℃, annealing time is 20h, carry out again two-shipper smooth, eleetrotinplate, obtaining thickness is the cold rolling soft tin-plate of 0.22mm.After testing, its grain fineness number is 7 grades, and hardness value (HR30Tm) is 50, and tensile strength is 300MPa, unit elongation 45%, and pickling time lag (PL) is 1.0s, Erichsen number is 9.6mm.| △ r| is 0.02.
Embodiment 3
By the chemical component weight percentage composition, be: C:0.080, Si:0.01, Mn:0.55, P:0.015, S:0.007, Als:0.025, N:0.0040, all the other raw material carbon aluminium-killed steels that are Fe and inevitable impurity are through desulfurizing iron, again after converter smelting, by molten steel through the RH vacuum-treat, then the molten steel after processing is continuously cast into to steel billet, continuous casting steel billet becomes steel band through hot continuous rolling, then hot rolled strip is carried out to pickling, under the condition that is 91% at draft, with the HC milling train carry out cold rolling after, through electrolytic degreasing, Full Hydrogen Bell Type Annealing Furnace annealing (BA) is annealed, perhydro bell-type annealing temperature is 650 ℃, annealing time is 19.5h, carry out again two-shipper smooth, eleetrotinplate, obtaining thickness is the cold rolling soft tin-plate of 0.35mm.After testing, its grain fineness number is 9 grades, and hardness value (HR30Tm) is 55, and tensile strength is 350MPa, unit elongation 42%, and pickling time lag (PL) is 2.0s, Erichsen number is 9.1mm.| △ r| is 0.1.
Embodiment 4
By the chemical component weight percentage composition, be: C:0.070, Si:0.009, Mn:0.65, P:0.013, S:0.008, Als:0.025, Ti:0.003, Nb:0.002, N:0.0018, all the other raw material carbon aluminium-killed steels that are Fe and inevitable impurity are through desulfurizing iron, again after converter smelting, by molten steel through the RH vacuum-treat, then the molten steel after processing is continuously cast into to steel billet, continuous casting steel billet becomes steel band through hot continuous rolling, then hot rolled strip is carried out to pickling, under the condition that is 93% at draft, with the HC milling train carry out cold rolling after, through electrolytic degreasing, Full Hydrogen Bell Type Annealing Furnace annealing (BA) is annealed, perhydro bell-type annealing temperature is 650 ℃, annealing time is 19.5h, carry out again two-shipper smooth, eleetrotinplate, obtaining thickness is the cold rolling soft tin-plate of 0.28mm.After testing, its grain fineness number is 8 grades, and hardness value (HR30Tm) is 51, and tensile strength is 320MPa, unit elongation 45%, and pickling time lag (PL) is 1.0s, Erichsen number is 9.3mm.| △ r| is 0.05.
Embodiment 5
By the chemical component weight percentage composition, be: C:0.065, Si:0.007, Mn:0.58, P:0.008, S:0.011, Als:0.010, Ti:0.0015, Nb:0.0016, N:0.0026, all the other raw material carbon aluminium-killed steels that are Fe and inevitable impurity are through desulfurizing iron, again after converter smelting, by molten steel through the RH vacuum-treat, then the molten steel after processing is continuously cast into to steel billet, continuous casting steel billet becomes steel band through hot continuous rolling, then hot rolled strip is carried out to pickling, under the condition that is 88% at draft, with the HC milling train carry out cold rolling after, through electrolytic degreasing, Full Hydrogen Bell Type Annealing Furnace annealing (BA) is annealed, perhydro bell-type annealing temperature is 650 ℃, annealing time is 19.5h, carry out again two-shipper smooth, eleetrotinplate, obtaining thickness is the cold rolling soft tin-plate of 0.28mm.After testing, its grain fineness number is 7 grades, and hardness value (HR30Tm) is 47, and tensile strength is 310MPa, unit elongation 48%, and pickling time lag (PL) is 1.0s, Erichsen number is 9.7mm.| △ r| is 0.03.
By above embodiment, can find out, isotropy of the present invention and corrosion-resistant good cold rolling soft tin-plate, thickness is 0.20～0.35mm, and cold rolling reduction is controlled at 85～93%, and hardness level is T-1.5, hardness value (HR30Tm) is 51 ± 4, tensile strength >=300MPa, unit elongation >=42%, average Erichsen number >=9.1mm, pickling time lag (PL)≤2 second, | △ r|≤0.1.
Claims (5)
1. the cold rolling soft tin-plate of isotropy, it is characterized in that: this tin plate comprises raw sheet and tin coating, the chemical composition of described raw sheet is by weight percentage: C:0.055～0.080%, Si≤0.02%, Mn:0.55～0.65%, P≤0.015%, S≤0.012%, Als:0.005～0.025%, N≤0.004%, all the other are Fe and inevitable impurity.
2. the production method of the cold rolling soft tin-plate of isotropy claimed in claim 1, it is characterized in that: the method comprises the following steps successively: desulfurizing iron, converter smelting, RH vacuum-treat, continuous casting, hot continuous rolling, pickling, cold rolling, electrolytic degreasing, the annealing of perhydro bonnet formula, smooth, eleetrotinplate;
Described cold rolling employing HC milling train carries out 5～6 passage rollings, and draft is 85～93%,
During described perhydro bonnet formula annealing, annealing temperature control is 650～660 ℃.
3. the production method of the cold rolling soft tin-plate of isotropy according to claim 2, is characterized in that: the annealing time 18～20h in described perhydro bonnet formula annealing process.
4. the production method of the cold rolling soft tin-plate of isotropy according to claim 2, is characterized in that: the annealing time 18.5～19.5h in described perhydro bonnet formula annealing process.
5. according to the production method of claim 2 or the cold rolling soft tin-plate of 3 or 4 described isotropy, it is characterized in that: described cold rolling employing HC milling train carries out 5～6 passage rollings, and draft is 88～91%.
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| CN107287513A (en) * | 2017-06-01 | 2017-10-24 | 首钢总公司 | Novel tin plate and preparation method thereof |
| CN107614729A (en) * | 2015-05-29 | 2018-01-19 | 杰富意钢铁株式会社 | High-strength steel sheet and its manufacture method |
| CN108300948A (en) * | 2018-02-27 | 2018-07-20 | 首钢京唐钢铁联合有限责任公司 | MR T-5CA steel grade tinned substrate and manufacturing method thereof |
| CN110218936A (en) * | 2019-06-03 | 2019-09-10 | 武汉钢铁有限公司 | A kind of boracic Ultra-low carbon tin plate and production method |
| CN111455290A (en) * | 2020-04-15 | 2020-07-28 | 深圳市兴鸿泰锡业有限公司 | Tin plate and production method thereof |
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| CN112226597A (en) * | 2020-10-16 | 2021-01-15 | 四川汇源钢建科技股份有限公司 | Cold rolling annealing method for cold-rolled strip steel |
| CN114058946A (en) * | 2021-10-14 | 2022-02-18 | 首钢集团有限公司 | Low-anisotropy high-strength high-elongation steel substrate, tin-plated plate and preparation method of tin-plated plate |
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| CN117004890A (en) * | 2023-06-29 | 2023-11-07 | 邯郸市金泰包装材料有限公司 | Tinned iron for high-tin-content aerosol valve and manufacturing method thereof |
| CN117004890B (en) * | 2023-06-29 | 2024-04-02 | 邯郸市金泰包装材料有限公司 | Tinned iron for high-tin-content aerosol valve and manufacturing method thereof |
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