CN103014483A - High extended secondary cold-rolled plate and production method thereof - Google Patents
High extended secondary cold-rolled plate and production method thereof Download PDFInfo
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- CN103014483A CN103014483A CN2011102889613A CN201110288961A CN103014483A CN 103014483 A CN103014483 A CN 103014483A CN 2011102889613 A CN2011102889613 A CN 2011102889613A CN 201110288961 A CN201110288961 A CN 201110288961A CN 103014483 A CN103014483 A CN 103014483A
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Abstract
The invention relates to a high extended cold-rolled plate, which comprises the following chemical components in percentage by weight: 0.15-0.20% of C, less than or equal to 0.030% of Si, 0.10-0.50% of Mn, less than or equal to 0.020% of P, less than or equal to 0.020% of S, 0.01-0.05% of Al, 0.0030-0.0080% of N, and the balance of iron and inevitable impurity. The production method comprises the following steps: carrying out iron pretreatment, converter melting, refining after the furnace, hot rolling, scouring, cold rolling, continuous annealing, secondary cold rolling, finishing to obtain the finished product roll, wherein in the process of the hot rolling, the controlled heating temperature is 1150-1270 DEG C, the finish rolling temperature is more than Ar3, the coiling temperature is less than or equal to 600 DEG C, the cold rolling deflection is more than or equal to 60%, the continuous annealing temperature is 600-700 DEG C, the annealing time is 40-100 seconds, the secondary cold rolling ratio is 5-15%, the hardness of the obtained secondary cold-rolled plate is HR30T66-80, and the tensile extension is more than or equal to 5%.
Description
Technical field
The present invention relates to the secondary cold-rolling plate, particularly relate to a kind of high extension secondary cold-rolling plate and manufacture method thereof, described cold-reduced sheet is used for making easy open end, punching press tank etc. and has the high steel product that require that extend.
Background technology
Tin plate, chrome plating are widely used in can body, the cover of food product pack industry.The secondary cold-rolling type that grew up in recent years zinc-plated (chromium plating) product especially with it the characteristic such as high strength, very narrow thickness, high-elongation and become the first-selection that vast cylinder of steel manufacturer reduces cost, ensures the quality of products.Because Three piece Can is made 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 be produced the secondary cold-rolling product of high rigidity, but because the deformation rate of secondary cold-rolling is generally larger, the material unit elongation of producing is also all lower, generally all about 0-4%, particularly the secondary cold-rolling deformation rate is greater than 30% situation, the unit elongation of material is substantially near 0%, common DR7MCA, DR8CA, DR9CA (respectively referring to GB/T 2520-2008, JIS G3303:2008, ASTMA623M-08) reach the hardness that product standard requires as shown in Figure 1, and the unit elongation of material is substantially less than 3%.CN101649381A discloses a kind of production method of secondary cold-rolling tinning original plate.The method may further comprise the steps: desulfurizing iron is smelted and vacuum-treat by Blowing Converter, the weight percent of control steel chemical composition satisfies after hot rolling again: 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; Steel clean through diluted acid that to carry out the first time with the HC milling train cold rolling again, and totally draft is controlled at 85-90%; Then through the annealing of perhydro bonnet formula, annealing temperature is controlled between 510-560 ℃; Carry out the second time with the HC milling train more cold rolling, the accumulative total draft is controlled at 30-40%; Finally by the smooth secondary cold-rolling tinning original plate that namely gets of two-shipper.The material of the uncoated tinplate base of producing with this method does not relate to stretch percentage elongation greater than 5%.
Therefore, need to provide the plate of the secondary cold-rolling 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 purpose of this invention is to provide a kind of high secondary cold-rolling plate that extends that has, to solve tank stamping cracking phenomenon processed.
The present invention is by 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 high chemical constitution weight percent that extends the secondary cold-rolling plate of the present invention 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%.
Among the present invention, unless otherwise, content all refers to weight percent content.
Another object of the present invention provides above-mentioned high manufacture method of extending the secondary cold-rolling plate, and the method comprises: roll up through hot metal pretreatment, converter smelting, furnace rear refining, hot rolling, pickling, cold rolling, continuous annealing, secondary cold-rolling, finishing finished product by the said ratio material.Wherein controlling hot rolling: Heating temperature 1150-1270 ℃, finishing temperature is Ar
3Above, coiling temperature is≤600 ℃; Cold rolling reduction is controlled at 〉=and 60%, the continuous annealing temperature is 600-700 ℃; Annealing time is 40-100 second; The secondary cold-rolling draft is 5-15%, other routinely technique carry out.The performance that obtains product is: hardness is HR30T 66-80, stretch percentage elongation 〉=5%.
Wherein, the control Heating temperature is 1180-1250 ℃ in the preferred hot rolling.
Preferably, finishing temperature is 840-900 ℃.
Preferably, coiling temperature is 500-580 ℃
Preferably, annealing temperature is 620-680 ℃.
Preferably, annealing time is 50-90 second.
Preferably, the secondary cold-rolling draft is 7-13%.
The present invention is the secondary cold-rolling plate that has high extension, high rigidity, low cost, good processability by designing and manufacturing of 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 characteristics such as good ductility, high rigidity, is used for making easy open end, punching press tank etc. and has the high purposes that requires of extending.The present invention mainly strengthens with C, N, and the alloy that Mn etc. are more expensive adds less, adopts continuous annealing production and lower secondary cold-rolling rate, so corresponding production cost is also lower.
Description of drawings
Fig. 1 is the relation of secondary cold-rolling material unit elongation and secondary cold-rolling rate.
Embodiment
Below by in conjunction with specific embodiments characteristics of the present invention and effect being described in detail.
For the high purpose of extending the secondary cold-rolling plate that provides of the present invention is provided, composition of the present invention and technique are carried out following control: because secondary cold rolled material is mainly used in the purposes such as the higher easy open end of hardness, punching press tank, not only require hardness high but also need the stretch pressing performance good, according to this purposes characteristic and requirement, material composition control of the present invention is as follows:
C: because C exists with the form of interstitial atom and cementite in material, in steel, has very strong strengthening effect, for strengthening material, therefore need to keep a certain amount of carbon in material improves hardness, carbon content too soft is not enough, carbon content is the high-ductility variation too, and is unfavorable to finished product processing behind the secondary cold-rolling.Especially easily produce the slab crackle in the peritectoid district scope of carbon about 0.08-0.14%, relatively difficulty is made in steel-making, so C control should be more suitable in the scope of 0.15-0.20%.
Si:Si easily produces low-melting SiO when hot rolling
2The iron scale of FeO eutectic system, be difficult to remove with high pressure water in hot rolling, thereby remain in the iron scale that takes on a red color on the hot-rolled steel sheet, this iron scale is engaged in dearly and is difficult to pickling on the hot-rolled steel sheet and washes off, thereby it is bad to produce cold rolling surface quality, affect the outward appearance of steel plate, even cause stamping cracking, so Si is controlled at below 0.030% as far as possible.Preferably, Si:0.005-0.025%.
Mn:Mn is the same with C to be the strengthening element of material, suitably adds the raising that a small amount of Mn is conducive to intensity in material, add simultaneously a small amount of Mn can with S in conjunction with generating MnS, reduce the surface hot-short, avoid surface quality problems; But it is too much unfavorable to punch process to add, so Mn should be controlled at 0.10-0.50%.Preferably, Mn:0.14-0.50%.
P, S:P, the lower processibility of S are 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, and is also unfavorable to solidity to corrosion.So it is low that the content of P, S will be tried one's best.General P is controlled at below 0.020%; S is controlled at below 0.020%.
Al:Al adds when making steel as reductor, favourable as improving materials processing simultaneously, the insufficient meeting of deoxidation causes material internal and surface quality problems less than 0.01% the time, and Al makes in the material greater than 0.05% that the N element is separated out too much, precipitate is excessively thick, can cause the strengthening effect of N to weaken.Preferably, Al:0.02-0.049%.
N: nitrogen and calorize are closed the precipitate and the free strength of materials that can make that form AlN and are risen, and improve material hardness, and too low strengthening effect is bad, too high reinforcing degree too greatly, also unfavorable to material ductility simultaneously, so N control should be controlled at 0.0030-0.0080%.Preferably, N:0.0033-0.0079%.
Steel grade of the present invention is made slab through continuous casting, then carries out hot rolling, and hot rolling technology control is as follows:
Heating temperature: hot rolling heating purpose is to promote in the material the abundant solid solution of trying one's best of C, N atom, for follow-up finish rolling, batch cooling material separate out control provide the 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 the hot rolling heating and temperature control is at 1150-1270 ℃.
Hot rolling finishing temperature: hot rolling finishing temperature adopts and is higher than Ar
3Temperature be rolled, the too high easy generation iron scale of finishing temperature, excessively low to enter two-phase region rolling, can produce material structure uneven and cause that hardness is inhomogeneous, poor processability, affect tank processed and process.
Coiling temperature: if coiling temperature during greater than 600 ℃, the precipitate of C, N compound is separated out too much in the material, causes finished product hardness excessively low, but temperature crosses low hot rolling and batch cooling control difficulty, thus coiling temperature be controlled at≤600 ℃, be preferably 500-580 ℃.
Cold-rolling process control is as follows:
The once cold rolling deflection: along with the increase of once cold rolling deflection, the annealing recrystallization drop in temperature of material is if the once cold rolling rate is too small, the material recrystallization temperature improves, certainly will need to improve annealing temperature, cause continuous annealing to produce difficulty etc., so rolling reduction is controlled at more than 60%.
Annealing temperature: annealing temperature is larger on the impact of material ductility, and the too low annealing of annealing temperature is insufficient, much higher hard, ductility variation.But the too high lower hardness of annealing temperature, thus the annealing temperature span of control at 600-700 ℃, preferred 620-680 ℃.Annealing time is 40-100 second, is preferably 50-90 second.
The secondary cold-rolling rate: the secondary cold-rolling deflection is remarkable on the ductility impact of material, increase with the secondary cold-rolling deflection, the unit elongation of its material reduces, and the undue ambassador's material of secondary cold-rolling draft unit elongation declines by a big margin, and too littlely then can not get needed hardness.So the secondary cold-rolling draft is controlled at 5-15%, preferred 7-13%.
Embodiment
(A～E) chemical composition with two comparative examples (F, G) sees the following form 1 to four embodiment of the present invention.
Table 1 wt%
Four embodiment of the present invention (A～E) see Table 2 with two comparative examples (F, G) hot rolling, cold rolling concrete technology and performance.
Table 2
Test example 1: hardness
Adopt the hardness of GB/T 230.1-2004 test embodiment of the invention A-E and Comparative Example F, G, it the results are shown in Table 2.
Test example 2: unit elongation
According to the unit elongation of GB/T 228 methods tests embodiment of the invention A-E and Comparative Example F, G, 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 of the present invention, DR8CA, DR9CA; DR8CA is equivalent to Embodiment C; DR9CA is equivalent to embodiment A, E; Common DR7MCA, DR8CA, DR9CA are equivalent to comparative example) under the same hardness condition, unit elongation is relatively high, can realize stretch percentage elongation 〉=5%.
The comparative example unit elongation is all less than 5% as can be seen from Table 2, and the unit elongation of embodiment of the invention steel is that 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 equal hardness.The present invention is by a certain amount of composition of control, 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 HR30T 66-80, unit elongation 〉=5%, can solve and produce the avulsion phenomenon in the tank punching course processed, be suitable for making easy open end, punching press tank etc. and have the high purposes that requires of extending.
Claims (14)
1. one kind has the high secondary cold-rolling plate that extends, its chemical composition by weight percentage 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.
2. the secondary cold-rolling plate with high extension as claimed in claim 1 is characterized in that Si:0.005-0.025%.
3. the secondary cold-rolling plate with high extension as claimed in claim 1 or 2 is characterized in that Mn:0.14-0.50%.
4. such as the arbitrary described high secondary cold-rolling plate that extends that has of claim 1-3, it is characterized in that Al:0.02-0.049%.
5. such as the arbitrary described high secondary cold-rolling plate that extends that has of claim 1-4, it is characterized in that N:0.0033-0.0079%.
6. such as the arbitrary described high secondary cold-rolling plate that extends that has of claim 1-5, its hardness is HR30T 66～80, and stretch percentage elongation is 〉=5%.
7. such as the arbitrary described manufacture method with high secondary cold-rolling plate that extends of claim 1-6, 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, the control Heating temperature is 1150-1270 ℃ in hot rolling, and finishing temperature is Ar
3Above, coiling temperature is≤600 ℃; Cold rolling reduction is 〉=60%, and the continuous annealing temperature is 600-700 ℃; Annealing time is 40-100 second; The secondary cold-rolling rate is 5-15%.
8. method as claimed in claim 7 is characterized in that, the control Heating temperature is 1180-1250 ℃ in the hot rolling.
9. such as claim 7 or 8 described methods, it is characterized in that, finishing temperature is 820-890 ℃.
10. such as the arbitrary described method of claim 7-9, it is characterized in that, coiling temperature is 500-580 ℃.
11. such as the arbitrary described method of claim 7-10, it is characterized in that, the secondary cold-rolling rate is 7-13%.
12. such as the arbitrary described method of claim 7-11, it is characterized in that, annealing temperature is 620-680 ℃.
13. such as the arbitrary described method of claim 7-12, it is characterized in that, annealing time is 50-90 second.
14. such as the arbitrary described method of claim 7-13, it is characterized in that, the once cold rolling draft is more than 60%.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103433319A (en) * | 2013-08-07 | 2013-12-11 | 宁波宝新不锈钢有限公司 | Manufacture method of stainless steel external wall panel for rail vehicle |
| CN104419865A (en) * | 2013-08-31 | 2015-03-18 | 上海梅山钢铁股份有限公司 | Cold-rolled tin plate for easy-to-open lid and production method of cold-rolled tin plate |
| TWI617677B (en) * | 2015-03-31 | 2018-03-11 | Jfe Steel Corp | Steel plate for can and method for producing steel plate for can |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS637336A (en) * | 1986-06-27 | 1988-01-13 | Nippon Steel Corp | Production of extra-thin steel sheet for welded can having excellent flanging property |
| JPH08283863A (en) * | 1995-04-11 | 1996-10-29 | Nkk Corp | Production of hard steel sheet for can excellent in uniformity of material |
| CN101275196A (en) * | 2007-03-27 | 2008-10-01 | 宝山钢铁股份有限公司 | Steel for seamless tin and manufacturing method thereof |
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2011
- 2011-09-26 CN CN201110288961.3A patent/CN103014483B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS637336A (en) * | 1986-06-27 | 1988-01-13 | Nippon Steel Corp | Production of extra-thin steel sheet for welded can having excellent flanging property |
| JPH08283863A (en) * | 1995-04-11 | 1996-10-29 | Nkk Corp | Production of hard steel sheet for can excellent in uniformity of material |
| CN101275196A (en) * | 2007-03-27 | 2008-10-01 | 宝山钢铁股份有限公司 | Steel for seamless tin and manufacturing method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103433319A (en) * | 2013-08-07 | 2013-12-11 | 宁波宝新不锈钢有限公司 | Manufacture method of stainless steel external wall panel for rail vehicle |
| CN104419865A (en) * | 2013-08-31 | 2015-03-18 | 上海梅山钢铁股份有限公司 | Cold-rolled tin plate for easy-to-open lid and production method of cold-rolled tin plate |
| TWI617677B (en) * | 2015-03-31 | 2018-03-11 | Jfe Steel Corp | Steel plate for can and method for producing steel plate for can |
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