CN103014483B - The secondary cold-rolling plate of high extension and manufacture method thereof - Google Patents
The secondary cold-rolling plate of high extension and manufacture method thereof Download PDFInfo
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Abstract
The present invention relates to a kind of secondary cold-rolling plate with high extension, its chemical composition is by weight percentage: C:0.15-0.20%, Si≤0.030%, Mn:0.10-0.50%, P≤0.020%, S≤0.020%, Al:0.01-0.05%, N:0.0030-0.0080%, all the other are iron and inevitable impurity.Its manufacture method, comprising: material is through hot metal pretreatment, converter smelting, furnace rear refining, hot rolling, pickling, cold rolling, continuous annealing, secondary cold-rolling, finishing finished product volume; Wherein, in hot rolling, control Heating temperature is 1150-1270 DEG C, and finishing temperature is Ar
3above, coiling temperature is≤600 DEG C; Cold rolling reduction is>=60%, and continuous annealing temperature is 600-700 DEG C; Annealing time is 40-100 second; Secondary cold-rolling rate 5-15%.The secondary cold-rolling plate hardness obtained is HR30T66-80, and stretch percentage elongation is >=5%.
Description
Technical field
The present invention relates to secondary cold-rolling plate, particularly relate to one high extension secondary cold-rolling plate and manufacture method thereof, described cold-reduced sheet has the high steel product extending requirement for making easy open end, punching press tank etc.
Background technology
Tin plate, chrome plating are widely used in can body, the cover of food packaging industry.The secondary cold-rolling type grown up in recent years zinc-plated (chromium plating) product becomes the first-selection that vast cylinder of steel manufacturer reduces costs, ensures the quality of products especially with characteristics such as its high strength, very narrow thickness, high-elongations.Because Three piece Can makes complicated, replace and adopt punching press tank DRD and rush cup DI, they are mainly used in food cans and beverages can field.If it is no problem that secondary cold rolled material DR material is used as Three piece Can, if but when being used for doing the purposes such as part DRD food cans or easy open end, because the ductility deficiency of secondary cold-rolling thin plate easily causes cracking phenomena.Some secondary cold-rolling tin-plated product manufacturing technology can produce the secondary cold-rolling product of high rigidity, but because the deformation rate of secondary cold-rolling is generally larger, the material unit elongation produced is also all lower, general all at about 0-4%, the particularly secondary cold-rolling deformation rate situation that is greater than 30%, the unit elongation of material is substantially close to 0%, common as shown in Figure 1 DR7MCA, DR8CA, DR9CA (respectively see GB/T2520-2008, JISG3303:2008, ASTMA623M-08) reach the hardness that product standard requires, and the unit elongation of material is less than 3% substantially.CN101649381A discloses a kind of production method of secondary cold-rolling tinning original plate.The method comprises the following steps: smelt and vacuum-treat through Blowing Converter after desulfurizing iron, the weight percent controlling steel chemical composition again after hot rolling meets: C:0.05-0.13, Si≤0.030, Mn≤0.60, P≤0.020, S≤0.050, and all the other are Fe and inevitable impurity; It is cold rolling that steel carry out first time with HC milling train again through diluted acid cleaning, and accumulative draft controls at 85-90%; Then through perhydro stove bell-type annealing, annealing temperature controls between 510-560 DEG C; Carry out second time with HC milling train more cold rolling, accumulative draft controls at 30-40%; Namely secondary cold-rolling tinning original plate is obtained finally by two-shipper is smooth.The material of the uncoated tinplate base produced by this method does not relate to stretch percentage elongation and is greater than 5%.
Therefore, need to provide the secondary cold-rolling plate with high extension, high rigidity, low cost, good processability, to be widely used as the wrapping material such as food and drink.
Summary of the invention
The object of this invention is to provide a kind of secondary cold-rolling plate with high extension, to solve tank stamping cracking phenomenon processed.
The present invention passes through to control certain composition, hot-rolled temperature, once cold rolling rate, annealing temperature and secondary cold-rolling rate, to improve the unit elongation of secondary cold-rolling material.
To achieve these goals, the chemical constitution weight percent that height of the present invention extends secondary cold-rolling plate is: C:0.15-0.20%, Si≤0.030%, Mn:0.10-0.50%, P≤0.020%, S≤0.020%, Al:0.01-0.05%, N:0.0030-0.0080%, all the other are iron and inevitable impurity.
Preferably, Si:0.005-0.025%.
Preferably, Mn:0.14-0.50%.
Preferably, Al:0.02-0.049%.
Preferably, N:0.0033-0.0079%.
In the present invention, unless otherwise, content all refers to weight percent content.
Another object of the present invention is to provide the manufacture method that above-mentioned height extends secondary cold-rolling plate, and the method comprises: by said ratio material through hot metal pretreatment, converter smelting, furnace rear refining, hot rolling, pickling, cold rolling, continuous annealing, secondary cold-rolling, finishing finished product volume.Wherein controlling hot rolling: Heating temperature 1150-1270 DEG C, finishing temperature is Ar
3above, coiling temperature is≤600 DEG C; Cold rolling reduction controls>=60%, and continuous annealing temperature is 600-700 DEG C; Annealing time is 40-100 second; Secondary cold-rolling draft is 5-15%, other routinely technique carry out.The performance obtaining product is: hardness is HR30T66-80, stretch percentage elongation >=5%.
Wherein, controlling Heating temperature in preferred hot rolling is 1180-1250 DEG C.
Preferably, finishing temperature is 840-900 DEG C.
Preferably, coiling temperature is 500-580 DEG C
Preferably, annealing temperature is 620-680 DEG C.
Preferably, annealing time is 50-90 second.
Preferably, secondary cold-rolling draft is 7-13%.
The present invention designs and manufactures the secondary cold-rolling plate with high extension, high rigidity, low cost, good processability by suitable Composition Design and secondary cold-rolling and annealing process, can be widely used as the wrapping material such as food and drink.Steel grade of the present invention has the features such as excellent ductility, high rigidity, has the high purposes extending requirement for making easy open end, punching press tank etc.The present invention is mainly with C, N strengthening, and the alloy that Mn etc. are more expensive adds less, adopts continuous annealing to produce and lower secondary cold-rolling rate, so corresponding production cost is also lower.
Accompanying drawing explanation
Fig. 1 is the relation of secondary cold-rolling material unit elongation and secondary cold-rolling rate.
Embodiment
Below by way of being described in detail feature of the present invention and effect in conjunction with specific embodiments.
In order to realize the object providing high extension secondary cold-rolling plate of the present invention, composition of the present invention and technique control as follows: be mainly used in the purposes such as the higher easy open end of hardness, punching press tank due to secondary cold rolled material, not only require that hardness is high but also need stretch pressing performance good, according to this purposes characteristic and requirement, material composition of the present invention controls as follows:
C: because C exists with the form of interstitial atom and cementite in the material, there is very strong strengthening effect in steel, in order to strengthening material, therefore need to retain a certain amount of carbon in the material to improve hardness, carbon content too soft is not enough, carbon content too high-ductility is deteriorated, unfavorable to finished product processing after secondary cold-rolling.Carbon especially easily produces slab crackle within the scope of the peritectoid district of about 0.08-0.14%, and steel-making manufactures more difficult, and therefore C control should be proper in the scope of 0.15-0.20%.
Si:Si easily produces the SiO of low melting point when hot rolling
2the iron scale of FeO eutectic system, be difficult to remove at hot rolling high pressure water, thus remain in iron scale that hot-rolled steel sheet takes on a red color, this iron scale is engaged in dearly and hot-rolled steel sheet is difficult to pickling washes off, thus cold rolled surface quality is produced bad, affect the outward appearance of steel plate, even cause stamping cracking, so Si controls below 0.030% as far as possible.Preferably, Si:0.005-0.025%.
Mn:Mn with C is the same is the strengthening element of material, suitably adds the raising that a small amount of Mn is conducive to intensity in the material, adds a small amount of Mn simultaneously and can combine with S and generate MnS, and it is hot-short to reduce surface, avoids surface quality problems; But it is too much unfavorable to punch process to add, so Mn should control at 0.10-0.50%.Preferably, Mn:0.14-0.50%.
The lower processibility of P, S:P, S is better, and P can improve the intensity of material, but P can cause the fragility of material and unfavorable to solidity to corrosion.S is harmful element to material of the present invention, can produce inclusion, affects the toughness of material, also unfavorable to solidity to corrosion.So the content of P, S to try one's best low.General P controls below 0.020%; S controls below 0.020%.
Al:Al adds when making steel as reductor, simultaneously favourable as improving materials processing, when being less than 0.01%, the insufficient meeting of deoxidation causes material internal and surface quality problems, and Al is greater than 0.05% makes that N element in material is separated out too much, precipitate is excessively thick, and the strengthening effect of N can be caused to weaken.Preferably, Al:0.02-0.049%.
N: nitrogen and calorize are closed the precipitate that forms AlN and freely the strength of materials can be made to increase, and improve material hardness, too low strengthening effect is bad, too high reinforcing degree too greatly, simultaneously also unfavorable to material ductility, so N control should control at 0.0030-0.0080%.Preferably, N:0.0033-0.0079%.
Steel grade of the present invention makes slab through continuous casting, then carries out hot rolling, and hot rolling technology controls as follows:
Heating temperature: hot rolling heating object promotes C in material, atom N abundant solid solution as far as possible, for follow-up finish rolling, batch cooling material separate out control provide basis, in general Heating temperature is high, cold rolling material hardness is also higher, but the too high surface quality to material of Heating temperature is unfavorable, so hot rolling heating and temperature control is at 1150-1270 DEG C.
Hot rolling finishing temperature: hot rolling finishing temperature adopts higher than Ar
3temperature be rolled, the too high easy generation iron scale of finishing temperature, too lowly enters two-phase region rolling, can produce material structure uneven and cause that hardness is uneven, poor processability, affect tank processed and process.
Coiling temperature: if when coiling temperature is greater than 600 DEG C, in material, the precipitate of C, N compound is separated out too much, causes finished product hardness too low, but the too low hot rolling reeling cooling of temperature controls difficulty, so oiler temperature control is at≤600 DEG C, is preferably 500-580 DEG C.
Cold-rolling process controls as follows:
Once cold rolling deflection: along with the increase of once cold rolling deflection, the annealing recrystallization temperature of material declines, if once cold rolling rate is too small, material re-crystallizes temperature improves, certainly will need to improve annealing temperature, cause continuous annealing to produce difficulty etc., so rolling reduction controls more than 60%.
Annealing temperature: annealing temperature can affect comparatively large on material ductility, the too low annealing of annealing temperature is insufficient, much higher hard, ductility deteriorates.But the too high lower hardness of annealing temperature, so annealing temperature span of control is at 600-700 DEG C, preferred 620-680 DEG C.Annealing time is 40-100 second, is preferably 50-90 second.
Secondary cold-rolling rate: secondary cold-rolling deflection on the ductility impact of material significantly, with the increase of secondary cold-rolling deflection, the unit elongation of its material reduces, and secondary cold-rolling draft undue ambassador's material unit elongation declines by a big margin, too little, can not get required hardness.So secondary cold-rolling draft controls at 5-15%, preferred 7-13%.
Embodiment
The chemical composition of four embodiments (A ~ E) of the present invention and two comparative examples (F, G) sees the following form 1.
Table 1wt%
Four embodiments (A ~ E) of the present invention and the hot rolling of two comparative examples (F, G), cold rolling concrete technology and performance are in table 2.
Table 2
Test example 1: hardness
Adopt GB/T230.1-2004 to test the hardness of embodiment of the present invention A-E and Comparative Example F, G, it the results are shown in Table 2.
Test example 2: unit elongation
According to GB/T228 method test embodiment of the present invention A-E and Comparative Example F, G unit elongation, it the results are shown in Table 2.
Fig. 1 is the relation of secondary cold-rolling material unit elongation and secondary cold-rolling rate.As seen from the figure, (wherein DR7MCA is equivalent to embodiment D, B for DR7MCA, DR8CA, DR9CA of the present invention; DR8CA is equivalent to Embodiment C; DR9CA is equivalent to embodiment A, E; Common DR7MCA, DR8CA, DR9CA are equivalent to comparative example) under same hardness condition, unit elongation is relatively high, can realize stretch percentage elongation >=5%.
Comparative example unit elongation is all less than 5% as can be seen from Table 2, and the unit elongation of embodiment of the present invention steel is 6-15% is all greater than 5%.Material unit elongation of the present invention is better than the secondary cold rolled material unit elongation of general similar stiffness.The present invention is by controlling a certain amount of composition, hot-rolled temperature, cold rolling reduction, annealing temperature and secondary cold-rolling rate, to improve the ductility of high rigidity secondary cold-rolling material, its hardness is HR30T66-80, unit elongation >=5%, can solve in tank punching course processed and produce avulsion phenomenon, be suitable for making easy open end, punching press tank etc. and there is the high purposes extending requirement.
Claims (13)
1. one kind has the high secondary cold-rolling plate extended, its chemical composition is by weight percentage: C:0.15-0.20%, Si≤0.030%, Mn:0.10-0.50%, P≤0.020%, S≤0.020%, Al:0.01-0.05%, N:0.0030-0.0080%, all the other are iron and inevitable impurity;
Described secondary cold-rolling plate is by comprising the method manufacture of following steps:
Material is through hot metal pretreatment, converter smelting, furnace rear refining, hot rolling, pickling, cold rolling, continuous annealing, secondary cold-rolling, finishing finished product volume;
Wherein, in hot rolling, control Heating temperature is 1150-1270 DEG C, and finishing temperature is Ar
3above, coiling temperature is≤600 DEG C; Cold rolling reduction is>=60%, and continuous annealing temperature is 600-700 DEG C; Annealing time is 40-100 second; Secondary cold-rolling rate is 5-15%.
2. there is the high secondary cold-rolling plate extended as claimed in claim 1, it is characterized in that, Si:0.005-0.025%.
3. there is the high secondary cold-rolling plate extended as claimed in claim 1, it is characterized in that, Mn:0.14-0.50%.
4. there is the high secondary cold-rolling plate extended as claimed in claim 1, it is characterized in that, Al:0.02-0.049%.
5. there is the high secondary cold-rolling plate extended as claimed in claim 1, it is characterized in that, N:0.0033-0.0079%.
6. secondary cold-rolling plate as claimed in claim 1, it is characterized in that, controlling Heating temperature in hot rolling is 1180-1250 DEG C.
7. secondary cold-rolling plate as claimed in claim 1, it is characterized in that, finishing temperature is 820-890 DEG C.
8. secondary cold-rolling plate as claimed in claim 1, it is characterized in that, coiling temperature is 500-580 DEG C.
9. secondary cold-rolling plate as claimed in claim 1, it is characterized in that, secondary cold-rolling rate is 7-13%.
10. secondary cold-rolling plate as claimed in claim 1, it is characterized in that, annealing temperature is 620-680 DEG C.
11. secondary cold-rolling plate as claimed in claim 1, it is characterized in that, annealing time is 50-90 second.
12. secondary cold-rolling plate as claimed in claim 1, it is characterized in that, once cold rolling draft is more than 60%.
13. as arbitrary in claim 1-12 as described in there is the high secondary cold-rolling plate extended, its hardness is HR30T66 ~ 80, and stretch percentage elongation is >=5%.
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| CN104419865B (en) * | 2013-08-31 | 2016-12-07 | 上海梅山钢铁股份有限公司 | A kind of easy-open end cold-rolled tin plate and production method thereof |
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