CN102719738B - Hard tinned original plate with thin specification and manufacture method thereof - Google Patents

Hard tinned original plate with thin specification and manufacture method thereof Download PDF

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CN102719738B
CN102719738B CN201110077796.7A CN201110077796A CN102719738B CN 102719738 B CN102719738 B CN 102719738B CN 201110077796 A CN201110077796 A CN 201110077796A CN 102719738 B CN102719738 B CN 102719738B
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rolling
temperature
annealing
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steel
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CN102719738A (en
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孔祥磊
黄国建
杨旭
黄明浩
于斌
徐烽
张英慧
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Angang Steel Co Ltd
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Angang Steel Co Ltd
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Abstract

The invention provides a hard tinned original plate with a thin specification and a manufacture method thereof, wherein the original plate comprises components of C 0.095%-0.130%, Si <= 0.020%, Mn 0.25%-0.40%, P <=0.015%, S <=0.015%, Als 0.015%-0.055%, Ti 0.005%-0.020%, N <= 0.003% and the balance being Fe. The method comprises smelting, continuous casting, hot rolling, acid pickling, cold rolling, electrolytic degreasing, full hydrogen cover annealing and flattening. The size of nonmetallic inclusions in steel after smelting is smaller than 10 [mu]m and lower than 0.04 unit/m2. Zero defect continuous casting is adopted. The heating temperature of hot rolling slabs is 1190-1250 DEG C and the heating time thereof is no shorter than 200 minutes, and the rough rolling temperature, finish rolling temperature and coiling temperature are 1030-1090 DEG C, 860-900 DEG C and 540-600 DEG C respectively. A CVC rolling mill is used in cold rolling, the total reduction rate being 86%-93%. The annealing temperature is no higher than 560 DEG C and the annealing time is no shorter than 12 hours. The flattening elongation percentage is 1.5%-2.0%. The alloy of the invention has low cost, small and few nonmetallic inclusions, excellent stamping performance, high product hardness value and small thickness.

Description

A kind of thin specification hard uncoated tinplate base and manufacture method thereof
Technical field
The invention belongs to smelting iron and steel Material Field, relate to thin specification hard uncoated tinplate base and manufacture method thereof that making rigidity can body and bottle cap are used, relate in particular to uncoated tinplate base and the manufacture method thereof of a kind of hardness HR30Tm in 61 ± 3.
Background technology
Tin plate is the important raw and processed materials of making the packaging vessels such as various food cans, bottle cap and chemical products, desired strength is high, good moldability, excellent corrosion resistance, weldability is strong, outward appearance is glossy and printing color is good, is the product that a kind of production technology is strong, manufacturing process is long, specification of quality is high and manufacture difficulty is large.The quality control gordian technique of uncoated tinplate base is mainly reflected in following 4 aspects: composition and Properties Control, thickness and precision, plate shape precision and surface quality.
High-quality uncoated tinplate base requires to get over Bao Yuehao on the basis that meets intensity index and deep drawability energy, and thickness thinning can significantly reduce production costs.Current domestic uncoated tinplate base thickness general control is at 0.2~0.5mm, but the optimization and upgrading of milling equipment and Controlling System makes the further attenuate of product become possibility.
Because tin plate is thinner, generally using hardness as the metewand of the strength of materials, according to the JIS G3303 of Japanese Industrial Standards, T1 is soft tin-plate to T3, T4 is hard tinned plate to T6.
Publication number is CN 101603147A, and the Chinese patent of " being applicable to hard tinned plate and the production technique thereof of punch process " by name discloses a kind of hard tinned plate that is applicable to punch process, produces with carbon aluminium-killed steel.This patent tin plate specification thicker (0.20~0.39mm), C low (in embodiment 0.086~0.094%) in composition, Mn high (0.047~0.049%), thereby production cost is higher, hardness fluctuations is slightly large in addition, and punching performance is on the low side, be unfavorable for the stably manufactured of subsequent product.
Publication number is CN 1193293A, it is wide more than 950mm that the Chinese patent of " ultra-thin steel sheet and manufacture method thereof " by name discloses a kind of plate, the tin plate of average thickness of slab below 0.20mm, the weight percent of its chemical composition is C:< 0.1% (being less than 0.09% in embodiment), Si :≤0.03%, Mn:0.05%~0.60%, P≤0.02%, S≤0.02%, Als:0.02%~0.20%, O:< 0.01%, N:< 0.015%, all the other are comprised of Fe and inevitable impurity.This patent is taked continuous annealing mode, during annealing, heating and cooling are all very fast, thereby punching performance deviation and easily cause the logical plate fault causing because of warpage and cold warpage, the HC intersection displacement rolling technique that this patent adopts is in addition more inadequate than slightly with CVC rolling technique in control thickness and plate shape ability, is difficult to meet the high-quality tin plate accuracy requirement of increasingly stringent.
Publication number is JP 58027933A, the Japanese Patent of " Production of T-3 mild blackplatehaving excellent corrosion resistance by continuous annealing " by name (a kind of soft blackplate of T-3 level with excellent corrosive nature that adopts continuous annealing to produce), this technology adopts continuous annealing mode, C content low (0.02~0.09), thereby low (the genus soft tin-plate of hardness, T-3 rank), be not suitable for making can body and the bottle cap of rigidity.
Publication number is CN101591755A, and the Chinese patent of by name " uncoated tinplate base for acidic food can and manufacture method thereof " is for improving raw sheet solidity to corrosion, and the impurity elements such as S, P and Cu, Cr, Ni, Mo have all been carried out to strict control.Production cost is higher, and its bell-type annealing temperature is high, and leveling elongation is low, is unfavorable for improving the hardness of tin plate.In addition, the solidity to corrosion of tin plate has only been emphasized in this invention, does not mention hardness, thickness and punching performance.
Publication number is CN 101643828A, the Chinese patent of " a kind of production method of anti-aging tinning black plate " by name relates to the production method that a kind of hardness HR30Tm is the anti-aging tinning black plate in 55 ± 4, its C content is low, and hardness is low, and specification partially thick (0.20~0.28mm).
" produce the metallurgical technology control principle of uncoated tinplate base " (bao steel technology, 1998 (4), P:40-44) paper is mentioned a kind of continuous annealing mode, its C content is low, specification 0.18-0.55mm.
" cover annealing T4 level upper limit hardness TECHNICAL OPTIMIZATION FOR " (iron and steel, 2007,37 (7), P:33-36) paper is not mentioned relevant composition and hot rolling technology, only relate to the optimization of bell-type annealing and flattening process, and leveling elongation is still on the low side.
In a word, in prior art or in composition, C content is on the low side, hardness value is low, specification is partially thick, employing continuous annealing mode, punching performance deviation and easily cause logical plate fault, otherwise the rolling technique ability adopting is slightly inadequate, is difficult to meet the high-quality tin plate accuracy requirement of increasingly stringent.
Summary of the invention
The object of the invention is to overcome above-mentioned the deficiencies in the prior art, provide a kind of hardness HR30Tm scope to be: 61 ± 3, thickness is: thin specification hard tinned plate and the production method thereof of 0.10~0.20mm.
The present invention is achieved in that the composition of this hard uncoated tinplate base is (weight percent): C:0.095%~0.130%, Si :≤0.020%, Mn:0.25%~0.40%, P≤0.015%, S≤0.015%, Als:0.015%~0.055%, Ti:0.005%~0.020%, N :≤0.003%, O :≤0.0035%, and surplus is Fe and inevitable impurity element.
Effect and the restriction of each principal element of the present invention are described as follows.
C: hardness is lower in the scope of carbon content 0.02%~0.07%, increase gradually, but its cold working (punching press, drawing) simultaneously and welding property degenerates with the hardness of the increase steel of carbon content.In addition because cementite is negative electrode with respect to carbon steel (matrix is ferrite), when carbon content increases, negative electrode quantity and area have been increased, correspondingly its corrosion current has increased, thereby cause pickling time lag (PL) to increase, for this reason, determine that hard uncoated tinplate base selects carbon aluminium-killed steel, carbon content control is 0.095%~0.130%.
Si: the content of uncoated tinplate base silicon is higher, the SiO of the oxidized production of silicon 2content increases thereupon, surface of steel plate SiO 2content is higher, and the adhesivity of coating is poorer.Therefore, for guaranteeing solidity to corrosion and the ageing resistance of uncoated tinplate base, need carry out strict control to silicone content, therefore silicone content is controlled at≤0.020%.
Mn: manganese is that generation is split on the limit of the hot rolled strip that can prevent that sulphur from producing on the one hand, on the other hand can reinforced ferrite, and solid solution increases the hardness of tin plate base material.But uncoated tinplate base manganese content is higher, PL value is larger, and the solidity to corrosion of tin plate declines.Therefore, hard tinned plate manganese content is 0.25%~0.40%.
P, S: in general, phosphorus sulphur all belongs to detrimental impurity element, should strictly control are more low better.Phosphorus can make material harden and worsen tinplate solidity to corrosion, and sulfide separate out and sulphur system is mingled with and easily causes hot-rolling edge cracking and stamping defect, therefore, phosphorus content≤0.015%, sulphur content≤0.015%.
Al: aluminium is calm element, also be strong nitride forming element, be used for fixing nitrogen-atoms, favourable for the ageing resistance performance that improves material, indispensable reductor when aluminium is also steel-making simultaneously, when its content is less than 0.015%, cannot meet specification of quality, and its content is higher than 0.055% time, not only cost up, and the growth of recrystal grain when suppressing annealing, so aluminium content is controlled between 0.015%~0.055%.
Ti: titanium is typical microalloy element, and the effect of titanium is crystal grain thinning, is carrying the high-intensity while, improves the toughness of steel.Under high temperature, Ti and N or O generate TiN or Ti 2o 3micropartical, refine austenite crystal grain is as the forming core core of pro-eutectoid α-Fe.Titanium content is too much, by forming large TiN particle, causes steel to become fragile, thereby reduces pressworkability, and titanium content is very few, be difficult to play the effect of microalloying, so titanium content is controlled between 0.005%~0.020%.
N: nitrogen is solid solution element, increase with nitrogen in steel content, cause pressworkability to degenerate, simultaneously, solid solution nitrogen is the major cause that causes tin plate finished product timeliness, and particularly, for the strain aging effect after smooth, the impact of nitrogen is especially large, therefore require nitrogen content as far as possible low, therefore Control of Nitrogen Content is≤0.003%.
O: oxygen solid solution in steel hardly, mainly with non-metallic inclusion, exist, while causing press working, crack and worsen steel plate solidity to corrosion, should strictly control, so Control for Oxygen Content is≤0.0035%.
Hard uncoated tinplate base of the present invention adopts following explained hereafter: the uncoated tinplate base that smelting → continuous casting → hot rolling → pickling → cold rolling → electrolytic degreasing → perhydro bell-type annealing → smooth → hardness HR30Tm is 61 ± 3.
Smelt: molten iron must carry out desiliconization, dephosphorization, desulfurization before steel-making; Converter smelting adopts top blast or top bottom blowing, during tapping, must adopt pushing off the slag technology; External refining adopts RH vacuum-treat, carry out oxygen decarburization, composition adjustment, remove in molten steel the harmful elements such as (H), (O), (N) and liquid steel temperature is controlled, make the chemical composition of steel pure, segregation-free, and control nonmetallic inclusionsin steel size below 10 μ m and be less than 0.04/m 2.
Zero defect continuous casting: adopt the technology such as large capacity tundish, induction stirring or dynamic soft-reduction, continuous casting covering slag, strand aerosol are cooling, multi-point straightening, improve slab inside and surface quality, guarantee to obtain flawless continuous-casting billet.
Hot rolling: continuous casting steel billet cold charge or direct hot charging are sent into walking beam furnace heating, and slab heating temperature is controlled at 1190~1250 ℃, heating of plate blank time >=200 minute; Roughing temperature is controlled at 1030~1090 ℃, and finishing temperature is controlled at 860~900 ℃.When finishing temperature is greater than 900 ℃, belt steel surface oxidation is serious, and product surface quality is poor, and when finishing temperature is less than 860 ℃, hot rolled strip is prone to mixed grain structure.Cooling through laminar flow, Strip Steel Coiling Temperature is controlled at 540~600 ℃.In order to make AlN solid solution, Fe3C refinement, and prevent that belt steel surface iron scale from thickening, coiling temperature should be controlled at below 600 ℃, and when temperature is during lower than 540 ℃, product is prone to perlite JiMA island, deep drawability variation.Final acquisition hot-rolled finished product thickness is 1.4~2.3mm.
On roughing mill, carry out multi-pass reversible rolling, in finishing train, carry out continuous irreversible rolling.For guaranteeing hot rolled strip quality, roughing and finish rolling are all controlled (AWC) function with the automatic width of hydraulic pressure, finish rolling adopts hydraulic bending roll, becomes contact support roll (VCR) and continuously variable crown (CVC) milling train, hydraulic press down system, High Precision Automatic gauge control (AGC) System Assurance thickness and convexity, between roughing and finish rolling, be provided with in addition electromagnetic induction heating type strip edge heater and Coil Box even to guarantee belt steel temperature, and by high pressure dephosphorization before roughing and finish rolling, indirectly fuel system lubricating oil rolling and between frame, establish wet-esp to guarantee surface clean zero defect.Final hot rolled strip quality control: thickness deviation 0~25 μ m, width 0~10mm, convexity deviation 0~0.030mm, Flatness ± 25I.
Pickling and cold rolling: can adopt acid to roll associating unit and produce, also can first pickling, after carry out cold continuous rolling.But preferably adopt acid to roll associating unit, produce, to enhance productivity.During pickling, should adjust unit speed according to the pickling ability of unit, guarantee pickling effect.Cold rolling employing CVC milling train tandem rolling, equipment thickness tester and laser Doppler anemometer before and after the most front and most end rolling mill, plate shape measurement roller is equipped with in last stand outlet, can measure strip tension and plate shape simultaneously, before last stand, complete distortion, last stand is only used as levelling machine, adopt permanent rolling load rolling to guarantee plate shape, CVC Controlling System and hydraulic pressing, the positive and negative roller of working roll and intermediate roll, traversing and the roll cooling of working roll and intermediate roll forms the closed loop system of flatness control, final strip thickness deviation 0~5 μ m that guarantees, convexity deviation 0~0.020mm, Flatness ± 10I.Cold rolling total reduction is 86%~93%.Cold rolling reduction is controlled the mechanical property, dimensional precision and the plate shape that affect material.Deflection is small wood material insufficient formability too, and the too large cold rolling production consumption increase of deflection and plate deformation are poor.
Electrolytic degreasing and perhydro bell-type annealing: in order to remove ROLLING OIL residue, adopt electrolytic degreasing.Band steel after degreasing enters full-hydrogen hood-type annealing furnace annealing.Annealing temperature≤560 ℃, annealing time >=12 hour.If annealing temperature is too high, after annealing, hardness is not enough, and annealing time is too short, and separating out of AlN is insufficient, and ferrite crystal grain can not fully be grown up, and is difficult to obtain the tissue that is conducive to deep-draw.
Smooth: after annealing, adopt Stand Mill smooth, smooth elongation control is within 1.5~2.0%.When smooth unit elongation is less than 1.5%, product surface quality roughness and plate shape are difficult to control, and material is partially soft; And smooth rate is while being greater than 2.0%, hardness significantly improves, and the processability of material and welding property will worsen, and leveling roll roller consumption also can increase.Therefore, smooth elongation control is within 1.5%~2.0%.
Adopting mentioned component and technique can obtain hardness HR30Tm exists: the thin specification hard uncoated tinplate base in 61 ± 3.
The present invention adopts the low Mn Composition Design of high C, and cost of alloy is low; Adopt RH vacuum-treat, composition is even, and nonmetal inclusion is little and few; Adopt bell-type annealing technique, product punching performance is excellent, the logical plate fault that the poor and warpage of punching performance that in the time of can eliminating because of continuous annealing, heating and cooling are fast caused simultaneously and cold warpage cause; Utilize CVC rolling and thickness, width, plate shape and surperficial control techniques, guaranteed quality product; Product hardness value is high, thickness is little (0.10~0.20mm), can significantly reduce user cost.
Embodiment
The present invention is further described by the following embodiment.
The chemical composition (surplus is Fe and inevitable impurity) as shown in table 1 of embodiment of the present invention molten steel.Continuously cast bloom, after again heating, being incubated, batches after roughing, finish rolling and laminar flow are cooling, and room temperature is cooling by pickling and cold rolling, and concrete technology parameter is in Table 2.Cold rolled strip, through annealing, smooth, obtains uncoated tinplate base, and relevant parameter is in Table 3.
The chemical smelting component (Wt%) of table 1 embodiment of the present invention raw sheet
The main technologic parameters of table 2 embodiment of the present invention
The parameter and annealing of table 3 embodiment of the present invention and performance

Claims (1)

1. the production method of a thin specification hard uncoated tinplate base, it is characterized in that comprising following technique: smelting-continuous casting-hot rolling-pickling-cold rolling-electrolytic degreasing-perhydro bell-type annealing-smooth, pure, the segregation-free of the chemical composition of steel after smelting, nonmetallic inclusionsin steel size is below 10 μ m and be less than 0.04/m 2; Continuous casting adopts zero defect continuous casting; During hot rolling, slab heating temperature is 1190~1250 ℃, heating of plate blank time>=200 minute, and roughing temperature is 1030~1090 ℃, and finishing temperature is 860~900 ℃, and coiling temperature is 540~600 ℃, and hot-rolled sheet thickness is 1.4~2.3mm; Cold rolling employing CVC milling train, cold rolling total reduction is 86%~93%; Annealing temperature≤560 ℃, annealing time>=12 hour; Smooth elongation control is 1.5%~2.0%; In described smelting technology, molten iron is carried out to desiliconization, dephosphorization, desulfurization; Converter tapping adopts pushing off the slag technology; External refining adopts RH vacuum-treat; Described hot rolling roughing adopts multi-pass reversible rolling, and finish rolling adopts continuous rolling; Roughing and finish rolling are all with the automatic width control function of hydraulic pressure, and finish rolling adopts hydraulic bending roll, becomes contact support roll and continuously variable crown milling train, is provided with strip edge heater and Coil Box between roughing and finish rolling, is provided with wet-esp between frame; Thickness tester and laser Doppler anemometer are housed on described cold-rolling mill, and plate shape measurement roller is equipped with in outlet, adopts permanent rolling load rolling; The composition weight percent of described raw sheet is: C:0.102%~0.130%, Si :≤0.020%, Mn:0.25%~0.40%, P≤0.015%, S≤0.015%, Als:0.015%~0.055%, Ti:0.005%~0.020%, N :≤0.003%, O :≤0.0035%, and surplus is Fe and inevitable impurity element.
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CN105251768B (en) * 2014-07-16 2017-05-24 鞍钢股份有限公司 Method for rolling ultra-thin cold-rolled tinning black plate
CN106834933A (en) * 2016-12-09 2017-06-13 天长市天龙泵阀成套设备厂 High intensity tin plate
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CN101603147A (en) * 2009-07-09 2009-12-16 武汉钢铁(集团)公司 Be applicable to the hard tinned plate and the production technique thereof of punch process

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1193293A (en) * 1996-03-15 1998-09-16 川崎制铁株式会社 Ultra-thin steel sheet and mfg. method therefor
CN101603147A (en) * 2009-07-09 2009-12-16 武汉钢铁(集团)公司 Be applicable to the hard tinned plate and the production technique thereof of punch process

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