WO1999053113A1 - Feuille d'acier pour boite boissons et procede de fabrication correspondant - Google Patents
Feuille d'acier pour boite boissons et procede de fabrication correspondant Download PDFInfo
- Publication number
- WO1999053113A1 WO1999053113A1 PCT/JP1999/001843 JP9901843W WO9953113A1 WO 1999053113 A1 WO1999053113 A1 WO 1999053113A1 JP 9901843 W JP9901843 W JP 9901843W WO 9953113 A1 WO9953113 A1 WO 9953113A1
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- WO
- WIPO (PCT)
- Prior art keywords
- less
- steel sheet
- cans
- rolling
- steel
- Prior art date
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 125
- 239000010959 steel Substances 0.000 title claims abstract description 125
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 25
- 238000000137 annealing Methods 0.000 claims abstract description 66
- 238000000034 method Methods 0.000 claims abstract description 44
- 238000005097 cold rolling Methods 0.000 claims abstract description 25
- 238000005098 hot rolling Methods 0.000 claims abstract description 15
- 238000001953 recrystallisation Methods 0.000 claims abstract description 13
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 6
- 238000005096 rolling process Methods 0.000 claims description 49
- 239000000203 mixture Substances 0.000 claims description 26
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- 238000013461 design Methods 0.000 description 7
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- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 6
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- 238000009864 tensile test Methods 0.000 description 3
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- 150000003568 thioethers Chemical class 0.000 description 3
- 229910000532 Deoxidized steel Inorganic materials 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 229910000655 Killed steel Inorganic materials 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
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- 229910052742 iron Inorganic materials 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
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- 150000001247 metal acetylides Chemical class 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 150000004767 nitrides Chemical class 0.000 description 2
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- 229910000882 Ca alloy Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 206010013786 Dry skin Diseases 0.000 description 1
- 229910005438 FeTi Inorganic materials 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- WXOMTJVVIMOXJL-BOBFKVMVSA-A O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O[Al](O)O.O[Al](O)O.O[Al](O)O.O[Al](O)O.O[Al](O)O.O[Al](O)O.O[Al](O)O.O[Al](O)O.O[Al](O)OS(=O)(=O)OC[C@H]1O[C@@H](O[C@]2(COS(=O)(=O)O[Al](O)O)O[C@H](OS(=O)(=O)O[Al](O)O)[C@@H](OS(=O)(=O)O[Al](O)O)[C@@H]2OS(=O)(=O)O[Al](O)O)[C@H](OS(=O)(=O)O[Al](O)O)[C@@H](OS(=O)(=O)O[Al](O)O)[C@@H]1OS(=O)(=O)O[Al](O)O Chemical compound O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O[Al](O)O.O[Al](O)O.O[Al](O)O.O[Al](O)O.O[Al](O)O.O[Al](O)O.O[Al](O)O.O[Al](O)O.O[Al](O)OS(=O)(=O)OC[C@H]1O[C@@H](O[C@]2(COS(=O)(=O)O[Al](O)O)O[C@H](OS(=O)(=O)O[Al](O)O)[C@@H](OS(=O)(=O)O[Al](O)O)[C@@H]2OS(=O)(=O)O[Al](O)O)[C@H](OS(=O)(=O)O[Al](O)O)[C@@H](OS(=O)(=O)O[Al](O)O)[C@@H]1OS(=O)(=O)O[Al](O)O WXOMTJVVIMOXJL-BOBFKVMVSA-A 0.000 description 1
- 206010039509 Scab Diseases 0.000 description 1
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- 229910011212 Ti—Fe Inorganic materials 0.000 description 1
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- 239000000155 melt Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0273—Final recrystallisation annealing
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
Definitions
- the present invention relates to a steel plate for cans and a method for producing the same, and more particularly to a steel plate for cans suitable for use in a three-piece can, particularly a modified three-piece can, and a method for producing the same.
- can containers can be broadly classified into two-piece cans consisting of a can body and a top lid, and three-piece cans consisting of a can body, a top lid, and a bottom lid.
- the can bodies are joined by methods such as soldering, resin bonding, and welding.
- design cans are mainly manufactured in three-piece cans, molded into a cylinder, joined, and then applied to the cylindrical joint body by using techniques such as elaborate split molds and hydrostatic pressing. To give the desired shape, for example, a barrel shape. Design cans manufactured by such a method are referred to as deformed three-piece cans, and are required to have the following characteristics superior to conventional three-piece cans.
- the main forms of fracture in the secondary deformation include a fracture near the welded portion and a fracture in the body, and the main defects in the secondary deformation include rough skin and stretch yard strain.
- the r-value can be lowered although it is insufficient compared with the method of box annealing low-carbon steel.
- Prevention and securing strength (hardness) are also easy.
- the workability is insufficient, and the secondary deformation tends to cause breakage, especially near the weld.
- this method is difficult to de-age and tends to generate strain trains.
- the method of (ii i) continuous annealing of IF steel generally has excellent non-aging properties, but is most disadvantageous in preventing rough skin because it tends to become coarse grains, and has the highest r-value. Although it is possible to solve these problems by a method of incompletely performing recrystallization annealing, it is difficult to obtain sufficient workability for secondary deformation. As described above, in the conventional method, it is difficult to reduce the r value to less than 1.Q to suppress a decrease in the can height, and in general, to prevent rough skin and secondary deformability and non-aging property. It is difficult to achieve both.
- Japanese Patent Application Laid-Open No. 1-116030 discloses that after substantially annealing low carbon steel of C : 0.10% or less at a recrystallization temperature of 800 ° C or less, a temperature of 300 to 700 ° C. By performing box annealing within the range, it has fine grains with a grain size number of 9 or more (corresponding to an average grain size of 17.6 / m or less). There is disclosed a technique for obtaining a steel sheet for easy-open cans having excellent can properties and the like. However, even with this technology, the r-value is 1.0 or more, and the secondary deformation workability, hardness, and rough surface resistance are at the levels required for the deformed three-piece cans targeted by the present invention. Was not satisfactory.
- the present invention solves the above-mentioned problems of the prior art, and provides a steel sheet for cans that satisfies workability, appearance properties after processing, and high yieldability that can meet the demands of complex can designs and a method of manufacturing the same.
- the present invention can effectively prevent the occurrence of surface defects caused by cluster-like inclusions such as alumina, and has good surface properties such as beautiful appearance and no defect, and excellent moldability of a welded portion.
- the purpose of the present invention is to provide a steel sheet and a method for manufacturing the same. Disclosure of the invention
- the present inventors have intensively studied to achieve the above object. As a result, by combining the addition of an appropriate amount of Mn and continuous annealing under appropriate conditions, it is possible to simultaneously reduce the r-value, refine the crystal grains, and increase the hardness, and furthermore, perform the heat treatment in the box annealing cycle. It has been newly found that the application can improve the secondary deformation workability and achieve non-aging.
- the present inventors have found that in order to prevent can body cracking during secondary deformation, it is important to suppress the concentration of deformation due to uneven thickness distribution. It has been found that it is effective to set it to 5 ⁇ or less.
- the present inventors have made it possible to improve the surface properties of a steel sheet and improve the formability of a welded portion.
- controlling the composition of oxides and sulfides remaining in steel is an important factor. That is, by controlling the composition of these inclusions within an appropriate range, and more preferably, by optimizing the manufacturing process of these steel sheets.
- the present invention has been completed based on the above findings.
- a steel sheet for cans characterized in that the r value in the direction perpendicular to the rolling direction is 0.4 to less than 1.0 and the age hardening index AI value is 30 MPa or less.
- the steel sheet for cans according to (1) which has a composition containing, by weight%, C: 0.03 to 0.1% and Mn: more than 0.5% to 1.0%.
- the composition contains, by weight%, C: 0.03 to 0.1%, Mn: more than 0.5% to 1.0%, A1: 0.10% or less, N: 0.0050% or less, A plate for cans characterized by the balance consisting of Fe and unavoidable impurities.
- a steel sheet for cans characterized in that the recrystallization texture is equal to or less than 1.0 in the r value of at least one of the rolling direction and the direction perpendicular to the rolling direction.
- oxide inclusions with a particle size of 1 to 50 m are composed of Ti oxide: 20 wt% or more and 90 wt% or less, and one or two of CaO and RE oxides in total of 10 wt% or more and 40 wt% hereinafter, A1 2 0 3: 40 wt% or less (Ti oxides, CaO, 1 kind or two kinds of RE oxides, total A1 2 0 3 100% or less) a steel sheet for cans, which is a.
- the crown of the hot-rolled sheet is set to 40 m or less in the hot rolling, and the crown of the cold-rolled sheet is set to 5 m or less in the cold rolling.
- FIG. 1 is a graph showing the relationship between crack generation and Bl / t during secondary molding.
- FIG. 2 is a graph showing the relationship between the yield elongation after aging treatment and the age hardening index AI value.
- FIG. 3 is a graph showing the relationship between the surface roughness after the secondary molding and the average crystal grain size of the product plate.
- FIG. 4 is an explanatory view showing an example of a modified three-piece can.
- Figure 5 shows the secondary moldability and the can height in the can height direction.
- 9 is a graph showing a relationship between a change and a rolling direction r value.
- the can body of a three-piece can is formed by cylindrical molding (normal grain method) so that the L direction (rolling direction) of the steel sheet is the circumferential direction of the can, and the C direction (right angle direction of rolling) of the steel sheet is the circle of the can.
- the steel sheet is stretched in the L direction by secondary forming after cylindrical forming (see Fig. 4).
- the amount of shrinkage in the can height direction is correlated with the amount of shrinkage in the width direction (perpendicular to the tensile direction) when tensile deformation is applied in the steel plate L direction, that is, the r value in the steel plate L direction.
- the steel sheet is drawn in the C direction by secondary forming. Therefore, the shrinkage in the can height direction is correlated with the r value in the steel sheet C direction. Therefore, the smaller the respective r values, the smaller the amount of shrinkage in the can axis direction after the secondary molding.
- the r-value is high, the can height tends to be uneven in the circumferential direction.
- the height of the can after secondary molding is determined by the strength of the can.However, if the amount of shrinkage is excessively large, it will be difficult to secure the internal capacity, or the can lid, can bottom and can body will be tightened. And other problems will occur.
- Figure 5 shows the relationship between the rolling direction r value of the steel sheet and the change in can height after secondary forming. From FIG. 5, it can be seen that it is appropriate to set the r value to 0.4 to 1.0 in order to reduce the change in the height of the can and to ensure sufficient workability. This tendency is the same for the reverse grain method. By setting the r-value of the steel sheet to 0.4 to 1.0 in both the L and C directions, the change in can height can be reduced irrespective of the direction of cylindrical forming.
- the A I value is the change in yield stress before and after the aging treatment at 100 ° C for 30 min after a tensile prestrain of 7.5% is applied to the product sheet.
- the same product plate was formed into a barrel-shaped can with a uniaxial strain range of 0.05 to 0.15 applied to the steel plate after the secondary forming, the presence or absence of stretch yaw strain in the body of the can was determined.
- a survey was conducted and also shown in Figure 2.
- the present inventors performed continuous annealing for low r value and the like, followed by overaging treatment by box-type annealing to sufficiently remove carbides and nitrides. And found that it is essential to reduce the amount of solute C and solute N as much as possible.o
- the crystal grain size of the product plate must be 10 m or less in order to prevent the occurrence of surface roughness after secondary molding.
- adjust the C content to 0.03% or more and perform recrystallization annealing after cold rolling by continuous annealing, which is short-time annealing, followed by It is preferable that the box-type annealing be performed within a range in which the crystal grains are not coarsened, and only for the purpose of promoting the precipitation of carbides and nitrides.
- C is one of the important elements in the present invention, and the strength of the steel sheet as it is annealed can be determined by increasing the amount of C. If the C content is less than 0.005%, the crystal grains become too coarse, and when applied for cans, the danger of causing a skin roughness phenomenon increases. From the viewpoint of ensuring the stability of product materials, it is desirable that the C content be 0.01% or more.
- the C content if the C content exceeds 0.1%, the pearlite content of the light-purity structure increases, and both hot rolling property and cold rolling property deteriorate. It becomes harder, and the moldability and corrosion resistance are significantly reduced, which is not preferable for use as a steel can plate. Further, the C content directly affects the increase in hardness of the welded portion. As the C content increases, the hardness of the welded portion increases, and as a result, the formability of the welded portion decreases.
- the C content is preferably in the range of 0.03 to 0.1% from the viewpoint of strengthening the steel sheet to obtain the strength of the can corresponding to the thinning and reducing the aging property of the steel sheet. In order to reduce aging, it is necessary to sufficiently precipitate cementite and reduce the amount of solid solution in steel. If the C content is less than 0.03%, the strength of the can corresponding to the thinning cannot be obtained.
- ⁇ is effective for deoxidation during smelting and also has the effect of suppressing hot brittleness of steel. In order to exhibit these desirable effects, it is desirable to add 0.05% or more.
- Mn is also one of the important elements for controlling the r-value of the steel sheet to a low r-value within the target range. Deformation For 3-piece cans, reduce the amount of shrinkage in the can height direction after secondary deformation. In order to reduce the cost, the r value of the product steel sheet in the L and C directions must be 0.4 or more and less than 1.0. Although the detailed mechanism of the effect of Mn on the reduction of the r value is unknown, it is considered that the increase of the solid solution Mn in the steel is effective in reducing the r value.
- Mn is also considered to be effective in reducing the aging of steel sheets.
- concentration of Mn in cementite has the effect of slowing down the moving speed at the cementite / flight interface. Cementite precipitated from the hot-rolled sheet partially re-dissolves in the annealing process, but the Mn concentration in the cementite slows down the movement speed of the cementite-flight interface. For this reason, it is difficult for cementite to be dissolved again. From this, it is considered that a steel sheet exhibiting low aging properties can be obtained by suppressing the increase of solid solution C in the annealing stage by Mn.
- Mn is also effective for solid solution strengthening, and the addition of Mn is effective in responding to future thinning. To achieve these effects, it is desirable to add more than 0.5%.
- the upper limit is set to 1.0% because the steel sheet is hardened and the workability such as stretch flangeability is deteriorated. . Preferably it is 0.7% or less.
- N contributes as a solid solution strengthening component, and when applied to extremely severe plasticity as in the present invention, leads to a decrease in ductility. Therefore, it is desirable to reduce N as much as possible. Considering the amount of ductility deterioration accompanying an increase in the N content, it is desirable to set the upper limit to 0.02%. N is an element that enhances aging and increases the frequency of strain strain. From the viewpoint of aging, practical problems can be prevented by setting the content to 0.0005% or less. Therefore, it is more preferable to set the N content to 0.0050% or less.
- the lower limit of the N content is not particularly limited, but if it is 0.0010%, it can be said that it is a range that can be industrially achieved in terms of cost. Further, from the viewpoint of ductility, the N content is preferably not more than 0.0030%, and from the viewpoint of securing a stable material, the amount of N is preferably not more than 0.0020%. An enclosure is more preferred.
- A1 0.10% or less
- A1 is an element that fixes solid solution N in steel as A1N and is effective for aging resistance. In order to enhance the aging resistance, it is preferable to add 0.01% or more of A1. However, in applications where aging resistance is more severe, it is desirable to add 0.05% or more of A1. Also, as the content increases, the frequency of occurrence of surface defects caused by alumina class dust etc. increases rapidly, so the upper limit was set to 0.10%. From the viewpoint of moldability, A1 is preferably set to 0.07% or less.
- A1 should be adjusted to 0.01% or less. When A1 is greater than 0.1% 0., giant A1 2 0 3 clusters deoxidization becomes A1 deoxidation is produced in large quantities, and tend to degrade the surface properties.
- one or more of Ti, B, V, and Nb may be added in place of part or all of A1 in order to reduce solid solution N.
- Ti is an element that combines with N as TiN and reduces the amount of solute N, and is an effective element for aging resistance.
- the addition amount of Ti, B, etc. is adjusted according to the N content, but when Ti is added alone, it is desirable to add 0.01% or more.
- Ti is set to 0.20% or less, preferably 0.01% or more. If there are strict requirements on the surface properties, the content of Ti should be in the range of 0.015% to 0.10% in order to form fine oxide inclusions and achieve finer crystal grains. desirable.
- B is an element that binds to N as BN and reduces the amount of solute N, and is an element effective for aging resistance.
- the addition amount of Ti, B, etc. is adjusted according to the N content, but when B is added alone, the amount is preferably 0.0003% or more. If B is added in excess of 0.01%, the cost increases and the embrittlement of the steel due to the formation of BN becomes significant.
- V 0.1% or less
- V is an element that combines with N as VN and reduces the amount of solute N, and is an element effective for aging resistance.
- the addition amount of Ti, V, etc. is adjusted according to the N content, but when V is added alone, it is preferably 0.005% or more, more preferably 0.01% or more. % Or more is good. On the other hand, if V is added in excess of 0.1%, the cost increases and the ductility decreases.
- Nb is an element that combines with N as NbN to reduce the amount of solute N, and is an element effective for aging resistance.
- the addition amount of Ti, Nb, etc. is adjusted according to the N content, but when Nb is added alone, it is preferably 0.002% or more, more preferably 0.005% or more. % Or more is good.
- Nb is added in excess of 0.1%, the cost increases and the ductility decreases.
- Al, Ti, B, V, Nb, and N are the contents (wt%) of each element.
- the above-mentioned A1 amount is further limited to 0.001 to 0.01%
- the above-mentioned Ti amount is limited to 0.015 to 0.10%
- the amount of cafe and Z or REM is set to 0.0005 to 0.01%.
- the fine oxide of Ti can improve the formability of the welded part by suppressing the coarsening of the structure of the welded part (particularly, the heat-affected zone). If the amount of Ti is less than 0.015%, the desired effect cannot be obtained because the amount of the fine oxide is too small. However, when the addition amount of Ti exceeds 0.10%, hot rollability, cold rollability, and secondary cold rollability after annealing are significantly reduced, and the surface properties of the product are also significantly reduced. Therefore, it is desirable to set the range of 0.015 to 0.10%. In order to secure more excellent surface properties, the content is more preferably 0.05% or less.
- A1 is greater than 0.1% 0.
- giant A1 2 0 3 classes evening scratch deoxidization becomes A1 deoxidation is mass produced, it tends to degrade the surface properties.
- A1 exceeds 0.01%, the amount of fine oxides of 50 / m or less that can control the grain growth during cold rolling and annealing is reduced, and there is the danger of problems such as rough skin during can making. Sex is increased.
- inclusion composition and amount A1 is large, A1 2 0 3 - CaO and Z or A1 2 0 3 -, and therefore RE M oxide, such inclusions become a starting point of ⁇ , corrosion resistance It tends to deteriorate.
- A1 is preferably set to 0.001% or more.
- One or two of Ca and REM are 0.0005-0.01% in total
- REM refers to rare earth elements such as a and Ce.
- CaO and / or REM oxides can contribute to the suppression of grain growth after cold rolling and annealing and the prevention of coarsening of welds (particularly weld heat affected zones). From these, Ca EM is contained in a total of 0.0005% or more. On the other hand, when the total amount of Ca and REM exceeds 0.01%, the risk of surface defects increases, and the disadvantage that corrosion resistance, which is important as a substrate for cans, decreases, becomes apparent.
- the upper limit is preferably set to 0.01%.
- Ca may be added for deoxidation, but if it exceeds 0.01%, processability is deteriorated.
- the upper limit is preferably set to 0.01% in consideration of the cost required for desulfurization treatment and the effect of improving mechanical properties by desulfurization. Further, a preferable upper limit value is 0.005% from the viewpoint of workability.
- S can exist as various sulfides in steel, but when it exists as MnS-based inclusions, it significantly expands in the rolling direction during hot rolling and cracks during can manufacturing of the final product. To encourage.
- ⁇ is from the viewpoint of producing a fine oxide is a necessary ingredient, when added in excess of 010% 0., coarse A1 2 0 3 by a large amount of generated decreases the ductility, deep drawability Let me do it. Therefore, it is preferable that the upper limit is 0.010%. Further, the more preferable upper limit of ⁇ is 0.007%. Further, 0 is more preferably 0.005% or less. If good surface properties are strictly required, adjust the amount of AL, Ti, and Ca and / or REM to an appropriate range, and further reduce S, Ca, and REM so as to reduce the amount of harmful S.
- the composition is optimized for the content of one or two of the following, with a particle size of 1 to 50 It is preferable that the oxide inclusion of m contains one or two of Ti oxide, CaO, and RBM oxide.
- Inclusions as deoxidation products Ti oxides and CaO, 1 kind or two kinds of RBM oxide, more particularly, Ti oxides CaO and Roh or REM oxide one A1 2 0 3 - Si0 2 system
- oxide-based inclusions specified in the present invention are limited to those having a particle size of 1 to 50 zm.
- inclusions in such a range can be regarded as inclusions generated by deoxidation.
- inclusions having a particle size of more than 50 ⁇ m are mainly caused by foreign inclusions such as slag and mold powder.
- A1 2 0 3 based cluster scratch there is also than this huge ones, if oxide composition having a particle diameter of 50 m or less inclusions satisfies the above requirements, a huge A1 2 0 3 system
- the clusters can be considered to be sufficiently reduced.
- the composition of the oxide-based inclusions having a particle size of 1 to 50 m is as follows: Ti oxide: 20 wt% or more and 90 wt% or less, one of CaO, RE oxide or two total: more than 10 wt% 40 wt% or less, A1 2 0 3: 40 wt% or less (Ti oxides, CaO, 1 kind or two kinds of REM oxides, A1 2 0 total 3 10 0% or less) in Is more preferable.
- the concentration of Ti oxide is preferably set to 20% by weight or more.
- the Ti oxide concentration is preferably set to 90 wt% or less. More preferably, the content is 30 wt% or more and 80 wt% or less.
- the inclusions do not become inclusions having a low melting point, causing nozzle clogging.
- the content exceeds 40 wt%, the inclusions subsequently absorb S and change to water-soluble, which is the starting point for Yasushi Therefore, the corrosion resistance decreases.
- a more preferred range is 20 to 40 wt%.
- the content of the oxide-based inclusions having a particle size of 1 to 50 n) is preferably not less than 80 wt% of the total amount of the inclusions. The reason for this is that if it is less than 80 vvt%, the control of inclusions is insufficient, which causes a surface defect of the coil and clogging of the nozzle.
- the upper limit is set to 0.10%. In particular, when excellent corrosion resistance is required, 0.02% or less is more preferable.
- the upper limit is set to 0.04% because, when P is contained in a large amount, ⁇ is hardened and workability is deteriorated, and corrosion resistance is also deteriorated. If these characteristics are particularly important, the content should be 0.01% or less.
- S exists as inclusions, reducing the ductility of the steel sheet and deteriorating the corrosion resistance. Since it is a chemical element, its upper limit is preferably set to 0.01%. For applications requiring particularly good workability, the content is preferably 0.005% or less.
- the steel sheet for cans of the present invention has a main phase of frit, an average crystal grain size of 10 ni or less, and preferably, a volume ratio of a powder phase having a particle size of 0.5 to 3 urn. It is preferred that the tissue contains 0.1 to 1%. In addition, the powder phase other than the above particle size is permissible up to a volume ratio of 1% or less.
- Average grain size 10 zm or less
- the average crystal grain size of the product plate is set to 10 m or less in order to prevent the occurrence of surface roughness during the secondary molding. It is preferable that the thickness be 5 im or more from the viewpoint of ensuring ductility.
- the average grain size is defined as the average grain size of the crystal grains measured in the thickness section (section in the rolling direction) using a cutting method in accordance with the provisions of J1S G0552 (however, The top 5 m was excluded from the average).
- r value 0.4 to less than 1.0 in the rolling direction or the direction perpendicular to the rolling direction
- the r-value in the rolling direction or the direction perpendicular to the rolling By setting the r-value in the rolling direction or the direction perpendicular to the rolling to 0.4 or more and less than 1.0, the amount of shrinkage in the longitudinal direction of the cylinder can be suppressed to the minimum during the secondary forming of the cylindrical can body. Yield can be improved. Although the deformed portion is thinned, the strength is increased by work hardening, and there is no problem in the properties of the can body. This is desirable from the viewpoint of reducing the weight of the can body.
- the r value may be any one of the rolling direction and the direction perpendicular to the rolling direction, as long as the direction matches the tensile direction of the secondary forming at the time of can-making, but it is more preferable that both directions are satisfied.
- Aging index AI value 30MPa or less
- the AI value of the product plate exceeds 30MPa, strain will occur during secondary molding and the appearance will be poor, so the AI value must be 30MPa or less. Preferably it is 20 MPa or less.
- the total elongation in each direction EL / thickness t ratio (B / t) should be 110 or more. Is preferred. It is more preferably 140 or more.
- the hardness of the steel sheet is lower than 50 in HR30T, sufficient strength of the can is not obtained, and it is easily deformed by external force. Due to this force, the flanges formed on the top and bottom of the can are deformed, and the lid becomes difficult to wind up. On the other hand, when it exceeds 57, the flange formability deteriorates and cracks easily occur. In addition, if it exceeds 57, even with the method of the present invention, tempering rolling must be more than 5%, and the amount of springback during cylindrical molding increases, causing problems such as poor welding. . Therefore, the hardness is preferably HR30T50-57.
- a steel material (slab) having the above composition is hot-rolled to form a hot-rolled steel plate, or the hot-rolled plate is further cold-rolled by cold rolling.
- the slab heating temperature for heating the slab prior to hot rolling is less than 1000, it is difficult to secure a high hot rolling finish temperature, while if the heating temperature exceeds 1300 ° C, the surface properties of the steel sheet It deteriorates remarkably.
- the slab heating temperature is preferably set to 1000 to 1300 ° C.
- the slab may be once cooled to room temperature and then reheated, or may be inserted into a heating furnace and heated without cooling. Also, finishing pressure Rough rolling may be performed prior to rolling, or direct finish rolling may be performed using a thin slab.
- Finish rolling temperature 800 to 1000 ° C
- finish rolling temperature is less than 800 ° C, it is difficult to refine the crystal grains of the final product sheet, and the aesthetic appearance after can making is lost.
- finish rolling temperature was limited to 800 to 1000 ° C.
- the finish rolling temperature shall be the value measured at the exit of the rolling mill according to the usual method.
- the hot rolling it is preferable to perform rolling in which the crown of the hot-rolled sheet is equal to or less than the following so that the crown of the cold-rolled sheet can be smoothly finished to 5 m or less.
- Rolling to reduce the crown of the hot-rolled sheet to 40 m or less is performed by roll-cross rolling, and in particular, it is desirable that at least three stands be rolled with a pair-cloth ⁇ -roll during finish rolling.
- crown is the absolute value (average value measured at both plate width ends) of [plate width center plate thickness-plate width end (plate thickness is 30 more than the end) plate thickness].
- Winding temperature 500 to 750 ° C
- the winding temperature is lower than 500, the uniformity of the shape and the material in the width direction of the steel sheet will be reduced. Further, in order to fix the solute N as A1N or the like and reduce the aging property, it is desirable that the winding temperature be 600 ° C or more. When fixing solid solution N mainly by Ti alone, the winding temperature may be as low as 500 ° C. On the other hand, if the winding temperature exceeds 700 ° C, the cementite aggregates and coarsens, the r-value after cold rolling and annealing becomes higher than the target range, and the uniformity of the microstructure of the hot-rolled base plate decreases. Further, the thickness of the scale is significantly increased, and the descaling property is reduced.
- the pickling conditions are not particularly limited, and normal pickling with hydrochloric acid or sulfuric acid is preferred.
- the pickled hot-rolled sheet is subjected to cold rolling.
- the conditions for cold rolling are not particularly limited, but in the production of ultra-thin steel sheets, it is usually advantageous to set it to 80% or more in terms of hot rolling and pickling costs.
- the crown of the cold rolled sheet shall be 5 or less. If the crown exceeds 5 m, breakage may occur in the can body, especially when performing secondary deformation of the steel plate stripped from the vicinity of the width end.
- Recrystallization annealing By continuous annealing method, the steel sheet is annealed at a temperature equal to or higher than the recrystallization end temperature and at a temperature equal to or higher than the recrystallization end temperature and higher than 80 (TC or less in the present invention because high secondary formability after cylindrical forming is required. Although it is possible to use a partially recrystallized structure as a special purpose, it is difficult to ensure the stability of the material. If the annealing is performed at a high temperature exceeding 800 ° C, the high-temperature strength is reduced and the thickness of the steel sheet is reduced, which increases the risk of causing a failure phenomenon called a heat buckle.
- Annealing is performed by the continuous annealing method.
- the temperature after heating is 800 ° C or lower.
- the structure after continuous annealing has ferrite as the main phase, and the powdery phase with a grain size of 0.5 to 3 in the X-ray is 0.5% by volume. It was found that the non-aging property after box annealing and the ductility were improved by using a structure containing 1 to 1% .In order to obtain such a structure, it is preferable to set the annealing temperature to 720 or more. .
- box annealing is a heat treatment for long-term soaking and slow cooling for the purpose of accelerating the precipitation of cementite and A1N. It is preferable that the box annealing be performed at a temperature of over 500 to 600 ° C for 1 to 10 hours. If the heat treatment temperature is lower than 500, precipitation of cementite, A1N, etc. is insufficient, and ductility is insufficient. On the other hand, if the heat treatment temperature exceeds 600 ° C, the cementite becomes excessively coarse and recrystallized grains become coarse.
- the box annealing treatment temperature is set to exceed 500 ° C and 600 ° C or less. Also, box annealing When the holding time is less than 1 hr, the above effects cannot be obtained. On the other hand, when the holding time is more than 10 hr, the productivity is lowered, so that the holding time is preferably 1 to 10 hr. Adequate precipitation of cementite and A1N improves aging resistance and ductility, and prevents the occurrence of strain strain during secondary molding and cracking during secondary molding. Secondary rolling reduction after recrystallization annealing: 0.5 to 5%
- the rolling reduction in the secondary cold rolling is preferably set to 0.5 to 5% in order to secure the strength of the can body, to make the material of the annealed plate uniform, and to reduce aging by introducing movable dislocations. At a rolling reduction of less than 0.5%, the desired effect is not observed. On the other hand, when the rolling reduction exceeds 5%, problems such as an increase in the amount of springback during cylindrical molding, deterioration of ductility, and generation of flange cracks due to ductility anisotropy occur.
- the thickness of the material is being reduced from the viewpoint of reducing the cost of can making, and the thickness of the plate is preferably 0.25 mm or less from the purpose of the present invention that it meets the needs of can makers.
- the steel sheet (method) of the present invention exhibits particularly superior secondary deformability at a thickness of t.
- ⁇ with the chemical composition shown in Table 1 was smelted in a converter and made into a slab by the continuous production method. These slabs were subjected to hot rolling, cold rolling, continuous annealing, and secondary cold rolling under the conditions shown in Table 2 to obtain a cold-rolled sheet with a final finished thickness of 0.22 nim. Next, tin plating equivalent to No. 25 was continuously applied on an ⁇ -gen type electric tin plating line to finish the tinplate.
- a specimen was taken from the direction perpendicular to the rolling direction (L direction) and the direction perpendicular to the rolling direction (L direction) of the tin-plated steel sheet obtained in this way, and the total elongation ⁇ , surface hardness HR30T, r value, AI value and The yield point elongation (Y-E1) after aging treatment equivalent to baking (210 ° C for 20 minutes) and the total elongation EL / t ratio were investigated. These used J1S No. 5 tensile test pieces.
- the r value is controlled in an appropriate range, the amount of shrinkage in the can axis direction during the secondary molding is small, and the initial blank shape can be made smaller.
- the yield improvement by this is about 2%, but it has a remarkable effect in the product field where the production volume is extremely large.
- the present invention example also has other characteristics more than the comparative example.
- tin plating is applied in the embodiment, but tin-free steel sheet, composite It may be used as a coated steel sheet without plating.
- the present invention can be applied to steel materials in which a resin film is adhered to the surface of a steel sheet.
- there is no problem in using it not only as a steel plate for three-piece cans but also as a steel plate for two-piece cans.
- the Ti concentration is 0.026 to 0.058 wt%
- the A1 concentration is 0.001 to 0.005 wt%
- the Ca concentration is 0.0000 to 0.0036 wt%
- the REM concentration is 0.000 to 0.0021 wt%
- the concentration of Ca and RBM is The sum was 0.0005-0.0043 wt%.
- the steel was produced by a two-strand slab continuous production apparatus to produce a continuous slab.
- Ar gas was not blown into the tundish or immersion nozzle. Observation after the continuous production showed that there was almost no deposit in the tundish and the immersion nozzle.
- the continuous slab was hot-rolled to a thickness of 1.8 mm.
- the hot rolling conditions were a slab heating temperature of 1130 ° C, a finish rolling temperature of 890 ° C, and a hot rolling winding temperature of 620.
- the hot-rolled steel sheet was pickled and cold-rolled to a cold-rolled sheet thickness of 0.18 mm.
- a continuous annealing type short-time annealing with 20S soaking at 740 was performed to obtain a cold-rolled annealed sheet.
- Specimens were collected from the cold-rolled annealed sheet thus obtained, and the structure of inclusions, r value, and AI value were examined. J1S No. 5 tensile test pieces were used to investigate these r values and A values.
- this slab was manufactured using a two-strand slab continuous manufacturing apparatus to manufacture a continuous slab.
- the average composition of inclusions Tandy Mesh molten steel, 95 ⁇ 98wt% Al 2 0 3, 5 wt% or less of Ti 2 0 3 clusters one shaped inclusions were mainly o
- the above-mentioned continuous slab is heated at a slab heating temperature of 1150 ° C, a finishing rolling temperature of 890 ° C, a hot rolling coiling temperature of 680 and hot rolled to 1.8 ⁇ , then pickled and cold rolled.
- a cold-rolled sheet having a thickness of 0.18 mm was obtained.
- a continuous annealing type short-time annealing was performed at 750 mm for 20 s soaking to obtain a cold-rolled annealed sheet.
- Specimens were collected from the cold-rolled annealed sheet thus obtained, and the structure of inclusions, r value, and AI value were examined. J IS No. 5 tensile test pieces were used for the investigation of r value and AI value.
- the amount of width shrinkage in the can axial direction is reduced.
- the yield of the material can be improved.
- the copper plate of the present invention has a small amount of cracks, has little deterioration in deformability due to inclusions or precipitates, has no surface defects due to cluster-like inclusions, has good surface properties, and has good weldability. It is a steel sheet with excellent formability in the part, and is extremely excellent as a steel sheet for 3-piece cans.
- the steel plate for cans which has the workability which can respond also to the requirement of a complicated can design and the appearance characteristic after a process can be manufactured. Further, according to the present invention, it is possible to improve the yield of raw materials in the production of cans, and to achieve a remarkable industrial effect.
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Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/445,404 US6221180B1 (en) | 1998-04-08 | 1999-04-07 | Steel sheet for can and manufacturing method thereof |
EP99912131A EP0999288B1 (en) | 1998-04-08 | 1999-04-07 | Steel sheet for can and manufacturing method thereof |
KR1019997011531A KR100615380B1 (ko) | 1998-04-08 | 1999-04-07 | 캔용 강판 및 그 제조방법 |
DE69937481T DE69937481T2 (de) | 1998-04-08 | 1999-04-07 | Stahlblech für eine dose und herstellungsverfahren dafür |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10/96481 | 1998-04-08 | ||
JP09648198A JP4193228B2 (ja) | 1998-04-08 | 1998-04-08 | 缶用鋼板およびその製造方法 |
JP10/286430 | 1998-10-08 | ||
JP28643098A JP4051778B2 (ja) | 1998-10-08 | 1998-10-08 | 表面性状が良好な3ピース缶に適した缶用鋼板 |
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WO1999053113A1 true WO1999053113A1 (fr) | 1999-10-21 |
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Application Number | Title | Priority Date | Filing Date |
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PCT/JP1999/001843 WO1999053113A1 (fr) | 1998-04-08 | 1999-04-07 | Feuille d'acier pour boite boissons et procede de fabrication correspondant |
Country Status (6)
Country | Link |
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US (1) | US6221180B1 (ja) |
EP (1) | EP0999288B1 (ja) |
KR (1) | KR100615380B1 (ja) |
CN (1) | CN1101482C (ja) |
DE (1) | DE69937481T2 (ja) |
WO (1) | WO1999053113A1 (ja) |
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WO2020105406A1 (ja) * | 2018-11-21 | 2020-05-28 | Jfeスチール株式会社 | 缶用鋼板およびその製造方法 |
KR102533809B1 (ko) * | 2018-12-20 | 2023-05-17 | 제이에프이 스틸 가부시키가이샤 | 캔용 강판 및 그 제조 방법 |
MY196420A (en) * | 2019-03-29 | 2023-03-30 | Jfe Steel Corp | Steel Sheet for Cans and Method for Manufacturing the same |
CN111996463B (zh) * | 2020-07-31 | 2021-12-14 | 马鞍山钢铁股份有限公司 | 一种低成本的低合金钢卷及其制造方法 |
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US5290370A (en) * | 1991-08-19 | 1994-03-01 | Kawasaki Steel Corporation | Cold-rolled high-tension steel sheet having superior deep drawability and method thereof |
DE69311393T2 (de) * | 1992-02-21 | 1997-09-25 | Kawasaki Steel Co | Verfahren zum Herstellen hochfester Stahlbleche für Dosen |
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- 1999-04-07 KR KR1019997011531A patent/KR100615380B1/ko not_active IP Right Cessation
- 1999-04-07 DE DE69937481T patent/DE69937481T2/de not_active Expired - Lifetime
- 1999-04-07 EP EP99912131A patent/EP0999288B1/en not_active Expired - Lifetime
- 1999-04-07 CN CN99800472A patent/CN1101482C/zh not_active Expired - Fee Related
- 1999-04-07 WO PCT/JP1999/001843 patent/WO1999053113A1/ja active IP Right Grant
- 1999-04-07 US US09/445,404 patent/US6221180B1/en not_active Expired - Lifetime
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JPH08176735A (ja) * | 1994-12-20 | 1996-07-09 | Kawasaki Steel Corp | 缶用鋼板とその製造方法 |
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JP2007107099A (ja) * | 2006-11-24 | 2007-04-26 | Kobe Steel Ltd | 加工性に優れた冷延鋼板及びその製造方法並びにその鋼板を母材とする溶融亜鉛めっき鋼板 |
JP4662175B2 (ja) * | 2006-11-24 | 2011-03-30 | 株式会社神戸製鋼所 | 加工性に優れた冷延鋼板を母材とする溶融亜鉛めっき鋼板 |
US8795443B2 (en) | 2007-04-26 | 2014-08-05 | Jfe Steel Corporation | Lacquered baked steel sheet for can |
Also Published As
Publication number | Publication date |
---|---|
CN1101482C (zh) | 2003-02-12 |
EP0999288A4 (en) | 2006-04-05 |
DE69937481D1 (de) | 2007-12-20 |
CN1263568A (zh) | 2000-08-16 |
EP0999288A1 (en) | 2000-05-10 |
US6221180B1 (en) | 2001-04-24 |
DE69937481T2 (de) | 2008-08-21 |
KR20010013524A (ko) | 2001-02-26 |
EP0999288B1 (en) | 2007-11-07 |
KR100615380B1 (ko) | 2006-08-25 |
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