CN103320685A - Hard tinned sheet steel and its production method - Google Patents
Hard tinned sheet steel and its production method Download PDFInfo
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- CN103320685A CN103320685A CN2012100770017A CN201210077001A CN103320685A CN 103320685 A CN103320685 A CN 103320685A CN 2012100770017 A CN2012100770017 A CN 2012100770017A CN 201210077001 A CN201210077001 A CN 201210077001A CN 103320685 A CN103320685 A CN 103320685A
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Abstract
The invention relates to a hard tinned sheet steel produced from low carbon aluminium killed steel so as to solve the technical problems of easy appearance of local edge waves during current pickling rolling production of tinned sheet steel, high incidence of surface iron oxide scale during continuous annealing production, high yield ratio of tin plates, undesirable stamping processing and the like. The hard tinned sheet steel and its raw sheet comprise the following chemical components (by weight): 0.05-0.07% of C, less than or equal to 0.1% of Si, 0.20-0.30% of Mn, less than or equal to 0.020% of P, less than or equal to 0.020% of S, 0.010-0.060% of Alt, less than or equal to 0.0060% of N, and the balance Fe and some inevitable impurity elements. The production method of the hard tinned sheet steel includes: steelmaking, continuous casting, hot rolling, combined pickling rolling, continuous annealing, double-stand tempering, and electrotinning. The hard tinned sheet steel produced in the invention has the advantages of small production control difficulty, excellent appearance quality, thin specification, stable hardness, and good stamping processing performance, etc., can meet the use requirements of high-speed canning, and can be widely used as a food cans, beverage cans, aerosol cans and other packaging materials.
Description
Technical field
The present invention relates to a kind of steel sheet, particularly a kind of hard Tinplate and production method thereof; Described hard Tinplate and production method thereof can be improved the quality of products and pressworkability.
Background technology
Tin plate is commonly called as " tinplate ", refer to that the two sides is coated with Low carbon cold rolling steel sheet or the steel band of commercially pure tin, it is incorporated into solidity to corrosion, weldability and the appearance attractive in appearance of the intensity of steel and formability and tin among a kind of material, have corrosion-resistant, nontoxic, high strength and good ductility, be widely used in the packaging fields such as food cans, beverages can, inhalator jar, chemical tank.
Fe-C binary alloy phase diagram shows: along with the increase of C content in the steel, the solid-state phase changes temperature Ar3 of γ → α descends.This type of hard Tinplate C content is lower at present, and the Ar3 temperature of γ → α is higher during this material hot rolling, thereby requires hot rolling finishing temperature higher.Different from other products, zinc-plated very thin with steel plate thickness, require the hot rolling raw sheet corresponding also thinner, so be difficult to the finishing temperature that reaches higher, hot rolling is easily rolling at γ+α two-phase region, cause the former edges of boards of hot rolling section heavier mixed crystal phenomenon, plate width direction mechanical property inequality to occur, thereby the local edge wave when cold rolling, easily occurs; In order to reach higher finishing temperature requirement, general as far as possible with the past upper limit control of finish rolling temperature in during production simultaneously, increased again the incidence of scale on surface defective; And in order to satisfy the tin plate hardness requirement, annealing temperature is lower during continuous annealing, causes tin plate yield tensile ratio mean value up to 0.95, is prone to punch process bad.
Chinese patent application number provides a kind of soft tin-plate of producing with continuous annealing mode for 201010201708.5 patent document, the chemical component weight per-cent of the raw material carbon aluminium-killed steel of this tin plate is: C:0.01-0.03%, Si :≤0.025%, Mn:0.10-0.25%, P :≤0.015%, S :≤0.012%, Als:0.04-0.08%, N :≤0.004%, and all the other are Fe and inevitable impurity; Namely obtain uncoated tinplate base after, electrolytic degreasing cold rolling through step desulfurizing iron, converter smelting, vacuum-treat, continuous casting, hot continuous rolling, pickling, HC milling train, the continuous annealing.By this chemical composition design requirement hot rolling finishing temperature more than 890 ℃, pressing embodiment 1,3,4 calculates, its hot rolled strip thickness is respectively 1.05mm, 1.67mm and 1.33mm, and the hot rolled strip production difficulty of this thickness is very big, and finishing temperature also is difficult to reach the control requirement; Therefore, this design is unsuitable for producing thin slab product, and the tin plate thickness range of patent protection is obviously unreasonable.The hardness HR30Tm of this design tin plate is 55 ± 4 simultaneously, and the hardness fluctuations scope is bigger than normal, can not satisfy the at a high speed industry development requirement of tank processed, high speed stamping.
The patent document of China Patent Publication No. CN 101603147A has been announced a kind of punch process that is applicable to, hard tinned plate with carbon aluminium-killed steel production, raw sheet chemical composition (wt%) is C:0.08-0.13, Si :≤0.025, Mn :≤0.65, P :≤0.020, S :≤0.020, solAl:0.02-0.06, Ti :≤0.03, N :≤0.005, all the other are Fe and inevitable impurity, through the production stage molten iron-steelmaking, continuous casting, hot rolling, plug-type pickling, the HC milling train is cold rolling, electrolytic degreasing, Full Hydrogen Bell Type Annealing Furnace annealing (BA), two-shipper is smooth, eleetrotinplate namely obtains this hard tinned plate.This chemical composition design steel grade belongs to inferior peritectic steel, the difficult control of crackle when continuous casting is produced, tin plate sheet surface difficult quality guarantee; Simultaneously this process using cover annealing, zinc-plated coiled sheet head, in, the tail mechanical heterogeneity, product plate shape and surface quality also can not show a candle to the hard tinned plate that continuous annealing is produced; Raising along with tank speed processed, present most customer requirements tin plate hardness is pressed HR30T target value ± 3 delivery, HR30T target value ± 2 delivery are pressed in a few high-end user even requirement, this design hardness fluctuations scope HR30T is 65 ± 5, can not satisfy user's delivery requirements and the requirement that tank industry processed develops to high speed far away.
Summary of the invention
The invention provides a kind of hard Tinplate and production method thereof, mainly solving at present this type of Tinplate acid rolls and is prone to the local edge wave when producing, connects that to move back when producing the scale on surface incidence high, the high bad technical barrier that waits of punch process that is prone to of tin plate yield tensile ratio, reduced production difficulty, the tin plate sheet surface Functionality, quality and appealing design, hardness performance is stable, is suitable for the at a high speed processing service requirements of tank processed.
Technical scheme of the present invention is: a kind of hard Tinplate, it is characterized in that raw sheet chemical composition (weight percent) is C:0.05-0.07%, Si≤0.1%, Mn:0.20-0.30%, P≤0.020%, S≤0.020%, Alt:0.010-0.060%, N≤0.0060%, surplus are Fe and some inevitable impurity.
A kind of production method of hard Tinplate, step comprises: steel-making, continuous casting, hot rolling, acid roll that associating, continuous annealing, Stand Mill are smooth, eleetrotinplate, it is characterized in that: 1200 ± 30 ℃ of hot rolling slab tapping temperatures, 870 ± 25 ℃ of finishing temperatures, 590 ± 30 ℃ of coiling temperatures, cold rolling reduction 85%~92%, 600 ± 15 ℃ of annealing heating section temperature, 600 ± 15 ℃ of annealing soaking zone temperature, annealing time 70s~95s, smooth unit elongation 1.0%~2.0%.The hardness value of hard Tinplate is HR30T 61 ± 3, and thickness is 0.17~0.38 ㎜, yield tensile ratio mean value≤0.90.
Through experimental studies have found that: when Mn=0.3 wt.% and one timing of other composition, when C brought up to 0.06 wt.% by 0.03 wt.%, the Ar3 temperature of γ → α approximately descended 12 ℃ in (1) carbon aluminium-killed steel.(2) optimization design of C content: utilize the strengthening effect of C element, suitably improve C content, improve annealing temperature, be conducive to reduce the tin plate yield tensile ratio; Simultaneously because the peritectoid transformation temperature (approximately 1495 ℃) of inferior peritectic steel (C:0.08 ~ 0.17 wt.%) is in zero strength temperature district and the zero plasticity humidity province of steel, when peritectic transformation occurs, the permission deflection of steel reduces, increased the tendency that continuously cast bloom cracks, the harsh control of continuous casting two cold processing requirement difficulty increases greatly simultaneously, so reduced the surface quality of tin plate; Therefore, in the strengthening effect that utilizes C simultaneously, also will avoid inferior peritectoid district, namely the C upper content limit needs less than 0.08 wt.%.
Technique effect of the present invention is: by chemical composition, hot rolling, cold-rolling process design, significantly reduce the finishing temperature control difficulty of especially thin size hot-rolled raw sheet, solved and be prone to the local edge wave when production is rolled in acid, connected the high problem of scale on surface incidence when producing of moving back; By avoiding the C content design in inferior peritectoid district, slab and tin plate sheet surface quality have been improved; Rationally utilize simultaneously the strengthening effect of C element, suitably improved the continuous annealing temperature, so that the tin plate metallographic structure is more even, tin plate hardness not only meets the demands but also have very high stability, effectively reduces yield tensile ratio; The advantages such as hard tinned plate of the present invention has the production control difficulty little, and visual appearance is excellent, and specification is thin, hardness is stable, and pressworkability is good have satisfied the at a high speed service requirements of tank processed of user.
Description of drawings
Fig. 1 is 500 times of metallographs of hard Tinplate of the present invention.
Embodiment
A kind of hard Tinplate is characterized in that raw sheet chemical composition (weight percent) is C:0.05-0.07%%, Si≤0.1%, Mn:0.20-0.30%, P≤0.020%, S≤0.020%, Alt:0.010-0.060%, N≤0.0060%, surplus is Fe and some inevitable impurity elements; Its production method comprises: associating → continuous annealing → Stand Mill is rolled in steel-making → continuous casting → hot rolling → acid smooth → eleetrotinplate.
The invention will be further described below in conjunction with embodiment and comparative example:
(1) steel-making: steel-making requires organizational routine production according to Composition Design, and its technological process of production is: enter after hot metal mixer is smelted ladle pouring station through desulfurization, skim, converter, Argon station, CAS are processed, continuous casting, Surface Quality of Steel Billet is good.The chemical composition of molten steel is as shown in table 1, and surplus is Fe and other inevitable impurity element;
Table 1 raw sheet chemical composition actual achievement, wt%
Numbering | C | Si | Mn | P | S | Alt | N |
Embodiment 1 | 0.05 | 0.0042 | 0.2416 | 0.0148 | 0.0145 | 0.0275 | 0.00216 |
Embodiment 2 | 0.0506 | 0.0113 | 0.2667 | 0.0118 | 0.0116 | 0.0583 | 0.00512 |
Embodiment 3 | 0.0619 | 0.0271 | 0.2896 | 0.0106 | 0.0105 | 0.0145 | 0.00281 |
Embodiment 4 | 0.0638 | 0.0065 | 0.2176 | 0.0093 | 0.0114 | 0.0385 | 0.00145 |
Embodiment 5 | 0.07 | 0.0082 | 0.2597 | 0.0145 | 0.0103 | 0.0361 | 0.00325 |
Comparative example 1 | 0.0355 | 0.0055 | 0.2796 | 0.015 | 0.0102 | 0.0492 | 0.00286 |
Comparative example 2 | 0.0329 | 0.0056 | 0.2044 | 0.0084 | 0.0115 | 0.0215 | 0.00246 |
(2) associating is rolled in hot rolling, acid: hot rolling mill is pressed the production of production engineering specifications tissue, stable temperature control; It is stable that the production operation of rolling is rolled in acid, the local edge wave do not occur, and the technique actual achievement sees Table 2:
The process integration actual achievement is rolled in table 2 hot rolling, acid
Numbering | Rolling thickness (㎜) | The finish rolling temperature in (℃) | Finishing temperature (℃) | Coiling temperature (℃) | Cold rolling reduction (%) |
Embodiment 1 | 2 | 1012 | 872 | 618 | 90 |
Embodiment 2 | 2 | 999 | 848 | 561 | 91 |
Embodiment 3 | 2.3 | 991 | 870 | 592 | 89 |
Embodiment 4 | 2.5 | 995 | 894 | 589 | 87 |
Embodiment 5 | 2.6 | 1005 | 885 | 584 | 85 |
Comparative example 1 | 2 | 1012 | 863 | 569 | 90 |
Comparative example 2 | 2.5 | 1010 | 876 | 582 | 87 |
(3) continuous annealing, Stand Mill is smooth and eleetrotinplate: connect and move back by the production of annealing process tissue, then eleetrotinplate technique is produced routinely, and product hardness is all qualified, and surface quality is good, and the technique actual achievement sees Table 3:
Table 3 continuous annealing process actual achievement
Numbering | Material thickness (㎜) | The heating zone temperature (℃) | The soaking zone temperature (℃) | Annealing time (s) | Smooth unit elongation (%) |
Embodiment 1 | 0.20 | 606 | 604 | 71 | 1.55 |
Embodiment 2 | 0.18 | 595 | 595 | 77 | 1.25 |
Embodiment 3 | 0.24 | 590 | 590 | 85 | 1.02 |
Embodiment 4 | 0.32 | 586 | 587 | 95 | 1.33 |
Embodiment 5 | 0.37 | 594 | 593 | 93 | 1.1 |
Comparative example 1 | 0.20 | 595 | 593 | 75 | 1.32 |
Comparative example 2 | 0.32 | 585 | 587 | 94 | 1.34 |
(4) end properties detects: the tin plate finished product is carried out metallographic structure, hardness and mechanical property detect, material structure of the present invention is ferrite+free cementite, sees Fig. 1.Mechanical property and hardness actual achievement see Table 4:
Table 4 mechanical property and hardness actual achievement
Numbering | ReL(MPa) | Rm(MPa) | Yield tensile ratio | A50mm% | Hardness HR30T |
Embodiment 1 | 360 | 420 | 0.857 | 32.5 | 58.6 |
Embodiment 2 | 350 | 405 | 0.864 | 28.5 | 59.8 |
Embodiment 3 | 395 | 440 | 0.898 | 31.5 | 60.4 |
Embodiment 4 | 395 | 435 | 0.908 | 31 | 61 |
Embodiment 5 | 380 | 415 | 0.916 | 30 | 61.4 |
Comparative example 1 | 395 | 410 | 0.963 | 28.5 | 59.8 |
Comparative example 2 | 395 | 405 | 0.975 | 34.5 | 59.5 |
Claims (5)
1. a hard Tinplate is characterized in that raw sheet chemical component weight per-cent is C:0.05-0.07%, Si≤0.1%, Mn:0.20-0.30%, P≤0.020%, S≤0.020%, Alt:0.010-0.060%, N≤0.0060%, surplus is Fe and some inevitable impurity elements.
2. the production method of the described hard Tinplate of claim 1 may further comprise the steps: steel-making, continuous casting, hot rolling, acid roll that associating, continuous annealing, Stand Mill are smooth, eleetrotinplate, it is characterized in that:
1200 ± 30 ℃ of hot rolling slab tapping temperatures,
870 ± 25 ℃ of finishing temperatures,
590 ± 30 ℃ of coiling temperatures,
Cold rolling reduction 85%~92%,
600 ± 15 ℃ of annealing heating section temperature,
600 ± 15 ℃ of annealing soaking zone temperature,
Annealing time 70s~95s,
Smooth unit elongation 1.0%~2.0%.
3. a kind of hard Tinplate according to claim 1, it is characterized in that: the hardness value of hard Tinplate is HR30T 61 ± 3.
4. a kind of hard Tinplate according to claim 1, it is characterized in that: the thickness of hard Tinplate is 0.17~0.38 ㎜.
5. a kind of hard Tinplate according to claim 1 is characterized in that: the yield tensile ratio mean value of hard Tinplate≤0.90.
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