CN103834867A - High strength BA tinplate substrate and manufacturing method thereof - Google Patents
High strength BA tinplate substrate and manufacturing method thereof Download PDFInfo
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Abstract
The invention provides a high strength BA tinplate substrate and a manufacturing method thereof. The high strength BA tinplate substrate is characterized by comprising the following components by weight: 0.08-0.12% of C, 0.029-0.033% of Si, 0.49-0.52% of Mn, 0.012-0.018% of P, 0.008-0.009% of S and 0.018-0.068% of Ti or 0.028-0.068% of Cr. By adding a trace amount of alloy element Ti or Cr in a smelting process of the substrate steel, the tinplate substrate which has high strength, good yield strength, tensile strength and rebound resilience and can keep original characteristics of BA is produced.
Description
Technical field
The present invention relates to metallic substance technical field, relate in particular to a kind of high strength BA material black plate and manufacture method thereof.
Background technology
Tinplate is that a kind of surface is coated with one deck pure stannum layer as thin as a wafer or the steel sheet of pure chromium layer, has good plasticity and erosion resistance, and rich glossiness outward appearance, can weld or seaming, dual rolling sealing are produced Three piece Can; The moulding deep processing that can carry out punching press, deep-draw, fill production seamless tin, irregular shaped cans etc. such as pulling out; Also have good coating, printing color, tin coating is nontoxic in addition, and chromium coating paint adhesion is extremely good, thereby tinplate is widely used in the fields such as grocery trade, electrical equipment, instrument, toy, chemical industry, decoration, applies very extensive.
In recent years, along with the development of packaging industry, the demand steady growth of domestic and international market to tinplate and substrate thereof, domesticly also emerges a lot of BA material black plate manufacturers.The substrate common name BA material substrate that adopts bell-type annealing mode to produce; BA material relies on the lower and good formability energy of its hardness, be mainly used in the Three piece Can tank industry processed that the punching press industries such as seamless tin and hardness requirement are lower, in the tank processed of the packaging industries such as tin plate food pot, beverages can, Metal Crown Lid, chemical tank, occupy very consequence.Along with the tank-making industry development of China is rapid, in the domestic BA material tinplate process of use, what run into is BA material lower hardness compared with distinct issues, intensity is lower, elasticity is poor, there is obvious gap with CA material substrate (substrate that continuous annealing mode is produced), be difficult to adapt to the production of Three piece Can high speed body maker group and the requirement to industries such as covers at the bottom of the higher Three piece Can of hardness requirement, bottle cap, tank, be difficult to the development trend that adapts to industry reduction iron thickness, reduces production costs.Because domestic black plate production is started late and mostly is BA material substrate, and seldom produce very early in the world BA material substrate, thus very few to this Study on Problems both at home and abroad, greatly hinder the use of domestic a large amount of BA materials, do not give full play to the advantage of BA material.The BA material of domestic production at present simultaneously, because n value is less, work hardening rate is less, and in the actual course of processing, the performance of bearing Pressing Deformation is not very good, and △ r value is also larger simultaneously, and the anisotropy of punch process is larger.
Summary of the invention
The object of the invention is to, for above-mentioned technical deficiency, provides a kind of high strength BA material black plate and manufacture method thereof.
For addressing the above problem, the present invention adopts following technical scheme:
A kind of high strength BA material black plate, is characterized in that: component and weight percent that described black plate comprises are as follows: C0.08～0.12%, Si0.029～0.033%, Mn0.49～0.52%, P0.012～0.018%, S0.008～0.009%, Ti0.018～0.068% or Cr0.028-0.068%.
C0.1% described above, Si0.03%, Mn0.50%, P0.016%, S0.009%, Ti0.035%.
C0.1% described above, Si0.03%, Mn0.50%, P0.016%, S0.009%, Cr0.030%.
A kind of manufacture method of high strength BA material black plate, it is characterized in that comprising the steps: that the continuously cast bloom to having a same composition with substrate described above carries out hot-rolled process, pickling process successively, cold rolling process, obtain chill roll bending, wherein hot-rolled process comprise again heating, roughing, finish rolling, cooling, batch, in described heating process, furnace temp is 1200 DEG C, insulation 1～2hr; The start rolling temperature of described roughing is at 1150～1200 DEG C; The finishing temperature of described finish rolling is controlled at 760～800 DEG C; In described refrigerating work procedure, utilize pipe stream water spray cooling, speed of cooling is controlled at 30 DEG C/s; In described coiling process, coiling temperature is controlled between 500～640 DEG C.
A kind of manufacture method of high strength BA material black plate, it is characterized in that comprising the steps: that the continuously cast bloom to having a same composition with substrate described above carries out hot-rolled process, pickling process successively, cold rolling process, annealing operation, smooth operation, obtains cold-reduced sheet, wherein hot-rolled process comprise again heating, roughing, finish rolling, cooling, batch, in described heating process, furnace temp is 1200 DEG C, insulation 1～2hr; The start rolling temperature of described roughing is at 1150～1200 DEG C; The finishing temperature of described finish rolling is controlled at 760～800 DEG C; In described refrigerating work procedure, utilize pipe stream water spray cooling, speed of cooling is controlled at 30 DEG C/s; In described coiling process, coiling temperature is controlled between 500～640 DEG C.
In hot-rolled process described above, roughing is divided into 4 passages, and rolling temperature is controlled at 1000～1150 DEG C, and deflection is controlled at 20～40%; Finish rolling operation is divided into 3 passages, and rolling temperature is controlled at 870～950 DEG C, and deflection is controlled at 20～40%, and the temperature drop between each passage is all in 5～10 DEG C/s left and right.
In annealing operation described above, annealing temperature is 570～610 DEG C.
In smooth operation described above, smooth draft 4～8%.
Composition Design explanation of the present invention: from the Composition Design of experimental steel, add micro-alloying element Ti or Cr, this trace alloying element can with baseplate material in nitrogen and carbon react, and the reaction occurring has following characteristics, when Ti or Cr content are while being abundant, it is separated out with nitride form, when high temperature, can hinder growing up of austenite crystal, plays refined crystalline strengthening effect; And along with the continuation of this trace alloying element content increases, the nitride particles of this micro-alloying element will alligatoring, thin brilliant effect weakens; The oxide particle of the trace alloying element that when low temperature, this trace alloying element diffusion-precipitation is tiny, plays precipitation strength effect, thereby plays the intensity, the hardness that improve original material.
Compared with prior art, the invention has the advantages that:
1,, by add micro-alloying element Ti or Cr in substrate steel are smelted, produce a kind of black plate that can keep the original feature of BA material in thering is high rigidity, good yield strength, tensile strength, rebound performance.
2, BA material black plate of the present invention, when thickness equals 0.23mm, its yield strength, tensile strength average can reach respectively σ s (MPa) 450Mpa and σ b (MPa) 415Mpa, springback angle reach 85 degree, HR30T hardness reaches more than 65; The bending resistance of the crown cork of making when thickness equals 0.23mm can approach 120N, far above the T4BA material black plate of condition of equivalent thickness, close to the T4CA material black plate of condition of equivalent thickness.
3, BA material black plate of the present invention can meet high strength Three piece Can, at a high speed performance and the production requirement of cover at the bottom of tank processed, high strength bottle cap, high strength tank, can be conducive to reduce with iron thickness, reduce production costs.
Brief description of the drawings
Fig. 1 is process flow sheet of the present invention.
Fig. 2 a is the metallographic structure figure that does not add alloying element Ti cold-rolled products annealing metacoxa.
Fig. 2 b is the metallographic structure figure that adds alloying element Ti cold-rolled products annealing metacoxa.
Fig. 3 a, 3b add the shape appearance figure of carbide in alloying element Ti cold-rolled products annealing metacoxa.
Fig. 3 c, 3d do not add the shape appearance figure of carbide in alloying element Ti cold-rolled products annealing metacoxa.
Fig. 4 a is the TEM shape appearance figure that adds oval precipitate in alloying element Ti cold-rolled products annealing metacoxa.
Fig. 4 b is the TEM shape appearance figure that adds square precipitate in alloying element Ti cold-rolled products annealing metacoxa.
Embodiment
Below in conjunction with accompanying drawing and some preferred embodiments, technical scheme of the present invention is elaborated.
In following examples, pickling adopts common push pull pickling line, the cold rolling unit of cold rolling employing six roller single stand reversible; The smooth unit of smooth employing four roller single chassis; Adopt 4～8% smooth drafts can improve the hardness after cold-reduced sheet annealing.
Adopt six roller single stand reversible cold-rolling mills, its cold rolling unit elongation is larger, adopts the thinner substrate of cost, rolling that approaches 90% cold rolling unit elongation and can reduce hot rolling raw material, simultaneously can crystal grain thinning, improve the hardness before cold-reduced sheet annealing.
Annealing adopts the intermittent type full-hydrogen hood-type annealing furnace table that circulates by force.Adopt hydrogen as shielding gas, utilize high-speed circulating blower fan, make hydrogen quick transmission of heat by convection in inner cover, reach fast, heating and cooling annealed material equably, product performance are even, production efficiency is high.
Tension specimen is according to GB/T228-2002 " metallic substance tensile testing at ambient temperature " processing, and tension test is carried out in SANSCMT5000 electric mechanical experimental machine, and cross beam movement speed is 2.5mm/min.
Metallographic specimen is to cut sample along rolling direction, and the sample cutting is polished with sand paper; Then polishing on mechanical polisher, rumbling compound Cr2O3, until can not see cut on metaloscope; Finally wipe sassafras totally and dry up with raw spirit cotton balls.Adopt 4% nital to carry out etching pit.Etch rear rapidly with alcohol clean, then dry up.On the multi-functional metaloscope of OLYMPUS GX51 inversion type, observe metallographic structure.
What sclerometer adopted is 452SVD Vickers hardness tester.
Embodiment 1
The present embodiment smelting technology is as follows, and Chemical Composition is as table 1.
Be specially: continuously cast bloom adopts the mode of hot charging stove, enter stove at 750～800 DEG C, reheat the austenitizing temperature insulation 1～2hr to 1200 DEG C, after coming out of the stove, adopt two stage rolling of roughing and finish rolling, start rolling temperature is low approximately 100 DEG C compared with austenitizing temperature, is controlled within the scope of 1150～1200 DEG C.Rolling is designed to 7 passages, and wherein roughing is 4 passages, and rolling temperature is controlled at 1000～1150 DEG C, and deflection is controlled at 20～40%; Finish rolling is 3 passages, and rolling temperature is controlled at 870～950 DEG C, and deflection is controlled at 20～40%, and finishing temperature is controlled at 760～800 DEG C.Temperature drop between each passage is all in 5～10 DEG C/s left and right.Roll the cooling rolled piece of rear utilization pipe stream water spray, by regulating the flow of water coolant and the group number of water cooling equipment to control water-cooled speed, speed of cooling is controlled at 30 DEG C/s.Water-cooled is to different coiling temperatures air cooling afterwards, and coiling temperature is controlled between 500～640 DEG C.The measurement of rolled piece surface temperature adopts Japan to produce ICON portable infrared temperature measurer, and the scope that pyroscope is measured temperature is 600～3000 DEG C, and the useful range of low temperature instrument is-50～1000 DEG C.
Hot-rolled sheet obtains chill volume substrate through pickling, after cold rolling, and the thickness of substrate is 0.38mm; Then carry out Mechanics Performance Testing.
It is as shown in table 2 that the present embodiment obtains the mechanical property of chill volume substrate.
Embodiment 2
The present embodiment Chemical Composition is as table 1, and manufacture method and performance test methods are with embodiment 1.
The present embodiment Chemical Composition is as table 1, and manufacture method and performance test methods are with embodiment 1.
Embodiment 4
The present embodiment Chemical Composition is as table 1, and manufacture method and performance test methods are with embodiment 1.
Embodiment 5
The present embodiment Chemical Composition is as table 1, and manufacture method and performance test methods are with embodiment 1.
The Chemical Composition of embodiment 6-8 is with embodiment 2, manufacture method is after pickling, cold rolling through 5 passages, then obtains cold-reduced sheet after degreasing, annealing, smooth, straightening, product final thickness is 0.23mm, and the technical process before pickling and cold-rolled products performance test methods are with embodiment 1-5.
Embodiment 6
The present embodiment Chemical Composition is as embodiment 2, and manufacture method is after hot-rolled sheet pickling, cold rolling through 5 passages, then obtains cold-reduced sheet after degreasing, annealing, smooth, straightening, and cold-reduced sheet final thickness is 0.23mm.Annealing temperature is 570 DEG C, and smooth draft is 6%.Then carry out Mechanics Performance Testing.Technical process before pickling and cold-reduced sheet performance test methods are with embodiment 1-5.
Embodiment 7
The present embodiment Chemical Composition is as embodiment 2, and manufacture method is after hot-rolled sheet pickling, cold rolling through 5 passages, then obtains cold-reduced sheet after degreasing, annealing, smooth, straightening, and cold-reduced sheet final thickness is 0.23mm.Annealing temperature is 588 DEG C, and smooth draft is 6%.Then carry out Mechanics Performance Testing.Technical process before pickling and cold-reduced sheet performance test methods are with embodiment 1-5.
Embodiment 8
The present embodiment Chemical Composition is as embodiment 2, and manufacture method is after hot-rolled sheet pickling, cold rolling through 5 passages, then obtains cold-reduced sheet after degreasing, annealing, smooth, straightening, and cold-reduced sheet final thickness is 0.23mm.Annealing temperature is 592 DEG C, and smooth draft is 6%.Then carry out Mechanics Performance Testing.Technical process before pickling and cold-reduced sheet performance test methods are with embodiment 1-5.
Comparative example 1
Chemical Composition is as table 1, and manufacture method and performance test methods are with embodiment 1-5.
Comparative example 2
Chemical Composition is as comparative example 1, and manufacture method is with embodiment 6.Hot-rolled sheet is through pickling, and 5 passages are cold rolling, and after degreasing, annealing, smooth, straightening, final thickness is 0.23mm.Annealing temperature is 570 DEG C, and smooth draft is 6%.Then carry out Mechanics Performance Testing.All the other technical process and performance test methods are with embodiment 1-5.
Comparative example 3
Chemical Composition is as comparative example 1, and manufacture method is with embodiment 7.Hot-rolled sheet is through pickling, and 5 passages are cold rolling, and after degreasing, annealing, smooth, straightening, final thickness is 0.23mm.Annealing temperature is 588 DEG C, and smooth draft is 6%.Then carry out Mechanics Performance Testing.All the other technical process and performance test methods are with embodiment 1-5.
Comparative example 4
Chemical Composition is as comparative example 1, and manufacture method is with embodiment 8.Hot-rolled sheet is through pickling, and 5 passages are cold rolling, and after degreasing, annealing, smooth, straightening, final thickness is 0.23mm.Annealing temperature is 592 DEG C, and smooth draft is 6%.Then carry out Mechanics Performance Testing.All the other manufacture method and performance test methods are with embodiment 1-5.
The mechanical experimental results of the comparative example 2-4 of embodiment 6-8 and same method processing is in table 3.
Table 1 obtains the Chemical Composition of chill volume product and the Chemical Composition of comparative example 1 for embodiment 1-5
| ? | C | Si | Mn | P | S | Ti |
| Comparative example 1 | 0.1 | 0.03 | 0.50 | 0.016 | 0.009 | ≤0.01 |
| Embodiment 1 | 0.1 | 0.03 | 0.50 | 0.016 | 0.009 | 0.018 |
[0064]?
| Embodiment 2 | 0.1 | 0.03 | 0.50 | 0.016 | 0.009 | 0.035 |
| |
0.1 | 0.03 | 0.50 | 0.016 | 0.009 | 0.068 |
| ? | C | Si | Mn | P | S | Cr |
| Embodiment 4 | 0.1 | 0.03 | 0.50 | 0.016 | 0.009 | 0.035 |
| Embodiment 5 | 0.1 | 0.03 | 0.50 | 0.016 | 0.009 | 0.068 |
Table 2 obtains the mechanical property of chill volume product and comparative example 1 product mechanical property contrast for embodiment 1-5
Can find from upper table, consider the factor of performance and cost, the over-all properties optimums such as the product strength of interpolation 0.035Ti.
The mechanical property contrast of the 0.23mm thickness cold-rolled products of table 3, interpolation 0.035Ti in the time of different annealing temperature
Comprehensively compared by upper table, in the time that annealing temperature is 570 DEG C, steel has higher intensity mechanical property; The comprehensive mechanical property optimum of embodiment 6.
Separately, contriver further finds in the time of preparing product process, if other parameter constants, improve smooth draft, as smooth draft is greater than 6%, when annealing temperature is 570 DEG C～585 DEG C, the HR30T hardness of product is greater than 65, σ b (MPa) and σ s (MPa) can reach respectively that 450MPa and 415Mpa are above, springback angle can reach more than 85 °.
Shown in Fig. 2 a and Fig. 2 b, the metallographic structure that interpolation alloying element Ti and same batch raw material do not add alloying element Ti cold-rolled products annealing metacoxa is ferrite and free cementite, but grain size and cementite distribution exist difference.Aspect grain size, add the substrate crystal grain of alloying element Ti tiny; Aspect the distribution of cementite, the cementite not adding in the substrate of alloying element Ti also has distribution at inside and the grain boundaries of crystal grain, for fine granularity, and the very disperse distributing and even, in the substrate of the alloying element Ti containing micro-, cementite distributes, and also comparatively disperse is even, and has the carbide of a lot of nano level Ti, be of a size of 3～5nm left and right, it is favourable that this performance to material improves.
Can be found out by Fig. 3 a, 3b, 3c, 3d, the particle adding in alloying element Ti substrate is the inhomogeneous disperse distribution of point range shape, in crystal grain, strengthening level is high, do not add precipitate in alloying element Ti substrate and be chain-cluster and be distributed in crystal boundary, play strengthening crystal boundary, strengthening level is low.
As shown in Fig. 4 a, in annealed sheet, carbide shape is mainly ellipse, is of a size of several nanometers to hundreds of nanometer not etc.As shown in Figure 4 b, also found the square TIN particle that is of a size of 300～400nm in annealed sheet, the TiN in annealed sheet is the second phase particles of separating out in the pyrotic smelting stage, and Main Function is pinning crystal boundary, hinders Austenite Grain Growth.In multiple microalloy carbonitride, the most remarkable with this effect of TiN, this is because its solubleness in austenite is minimum, has high thermodynamic stability, is difficult for alligatoring most.
Claims (8)
1. a high strength BA material black plate, is characterized in that: component and weight percent that described black plate comprises are as follows: C0.08～0.12%, Si0.029～0.033%, Mn0.49～0.52%, P0.012～0.018%, S0.008～0.009%, Ti0.018～0.068% or Cr0.028-0.068%.
2. a kind of high strength BA material black plate as claimed in claim 1, is characterized in that: described C0.1%, Si0.03%, Mn0.50%, P0.016%, S0.009%, Ti0.035%.
3. a kind of high strength BA material black plate as claimed in claim 1, is characterized in that: described C0.1%, Si0.03%, Mn0.50%, P0.016%, S0.009%, Cr0.030%.
4. the manufacture method of a high strength BA material black plate, it is characterized in that comprising the steps: that the continuously cast bloom that the substrate as described in as arbitrary in claims 1 to 3 is had to a same composition carries out hot-rolled process, pickling process successively, cold rolling process, obtain chill roll bending, wherein hot-rolled process comprise again heating, roughing, finish rolling, cooling, batch, in described heating process, furnace temp is 1200 DEG C, insulation 1～2hr; The start rolling temperature of described roughing is at 1150～1200 DEG C; The finishing temperature of described finish rolling is controlled at 760～800 DEG C; In described refrigerating work procedure, utilize pipe stream water spray cooling, speed of cooling is controlled at 30 DEG C/s; In described coiling process, coiling temperature is controlled between 500～640 DEG C.
5. the manufacture method of a high strength BA material black plate, it is characterized in that comprising the steps: that the continuously cast bloom that the substrate as described in as arbitrary in claims 1 to 3 is had to a same composition carries out hot-rolled process, pickling process successively, cold rolling process, annealing operation, smooth operation, obtains cold-reduced sheet, wherein hot-rolled process comprise again heating, roughing, finish rolling, cooling, batch, in described heating process, furnace temp is 1200 DEG C, insulation 1～2hr; The start rolling temperature of described roughing is at 1150～1200 DEG C; The finishing temperature of described finish rolling is controlled at 760～800 DEG C; In described refrigerating work procedure, utilize pipe stream water spray cooling, speed of cooling is controlled at 30 DEG C/s; In described coiling process, coiling temperature is controlled between 500～640 DEG C.
6. the manufacture method of a kind of high strength BA material black plate as claimed in claim 5, is characterized in that: in described hot-rolled process, roughing is divided into 4 passages, and rolling temperature is controlled at 1000～1150 DEG C, and deflection is controlled at 20～40%; Finish rolling operation is divided into 3 passages, and rolling temperature is controlled at 870～950 DEG C, and deflection is controlled at 20～40%, and the temperature drop between each passage is all in 5～10 DEG C/s left and right.
7. the manufacture method of a kind of high strength BA material black plate as claimed in claim 5, is characterized in that: in described annealing operation, annealing temperature is 570～610 DEG C.
8. the manufacture method of a kind of high strength BA material black plate as claimed in claim 5, is characterized in that: in described smooth operation, and smooth draft 4～8%.
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| CN104988387A (en) * | 2015-06-19 | 2015-10-21 | 唐山不锈钢有限责任公司 | Production method of hot rolled strip steel for MRT-4 tin plate |
| CN108421831A (en) * | 2018-02-27 | 2018-08-21 | 首钢京唐钢铁联合有限责任公司 | Method and device for controlling temperature drop in rough rolling process |
| CN112176166A (en) * | 2020-09-09 | 2021-01-05 | 唐山不锈钢有限责任公司 | Production method of high-yield-strength and high-elongation T-5 tinplate base 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 |
| CN101643828A (en) * | 2009-08-25 | 2010-02-10 | 武汉钢铁(集团)公司 | Production method of anti-aging tinning black plate |
| CN102719738A (en) * | 2011-03-29 | 2012-10-10 | 鞍钢股份有限公司 | Thin-specification hard tinning raw plate and manufacturing method thereof |
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| JP2004285419A (en) * | 2003-03-24 | 2004-10-14 | Nippon Steel Corp | Steel sheet causing no stretcher strain for container and manufacturing 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 |
| CN101643828A (en) * | 2009-08-25 | 2010-02-10 | 武汉钢铁(集团)公司 | Production method of anti-aging tinning black plate |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104988387A (en) * | 2015-06-19 | 2015-10-21 | 唐山不锈钢有限责任公司 | Production method of hot rolled strip steel for MRT-4 tin plate |
| CN104988387B (en) * | 2015-06-19 | 2017-04-12 | 唐山不锈钢有限责任公司 | Production method of hot rolled strip steel for MRT-4 tin plate |
| CN108421831A (en) * | 2018-02-27 | 2018-08-21 | 首钢京唐钢铁联合有限责任公司 | Method and device for controlling temperature drop in rough rolling process |
| CN108421831B (en) * | 2018-02-27 | 2019-09-20 | 首钢京唐钢铁联合有限责任公司 | Method and device for controlling temperature drop in rough rolling process |
| CN112176166A (en) * | 2020-09-09 | 2021-01-05 | 唐山不锈钢有限责任公司 | Production method of high-yield-strength and high-elongation T-5 tinplate base plate |
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Address after: 528400 No. 25, Dong Yi Road, Torch Development Zone, Guangdong, Zhongshan Patentee after: Yuehai Zhongyue (Zhongshan) tinplate Industry Co., Ltd Address before: 528437 No. 25, Dong Yi Road, Torch Development Zone, Guangdong, Zhongshan Patentee before: ZHONGSHAN ZHONGYUE TINPLATE INDUSTRIAL Co.,Ltd. |
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