TW200948984A - Manufacturing method of steel sheet for cans - Google Patents

Abstract

Disclosed is a method for producing can manufacturing steel sheet with which the steel sheet production cost is reduced by omitting a recrystallization annealing step, excessive strengthening caused by hardening with cold rolling is avoided, and variation in the sheet thickness in the length direction of the steel sheet coil is controlled. The steel components comprise, in mass%, C: 0.005% or less, Mn: 0.05-0.5%, Al: 0.01-0.10%, N: 0.0010-0.0070%, B: 0.15 N to 0.75 N (by atom ratio, 0.20 N to 0.97 N) and also comprise one or both of Nb: 4 C to 20 C (by atom ratio, 0.52 C to 2.58 C) and Ti: 2 C to 10 C (by atom ratio, 0.50 C to 2.51 C), with the remainder being Fe and unavoidable impurities. Said steel is formed into slabs by means of continuous casting. It is then hot rolled at a finishing temperature equal to or lower than the Ar3 transformation point, coiled and pickled, followed by cold rolling at a rolling reduction rate of 50-96%.

Description

200948984 VI. Description of the Invention: [Technical Field] The present invention relates to a method for producing a steel sheet for can making which has excellent plate thickness precision, and more particularly to a method suitable for crushing a can into a diameter equal to that of a can. A method for producing a steel sheet for cans which is used for the purpose of flange processing after being bent into a cylindrical shape or a rectangular tube shape and joining the end portions to form a can body. [Prior Art] 罐 A can, a food can, an 18 liter can, a pail can, etc. can be roughly divided into two cans (tw〇_piece can) and three cans according to the method (step) thereof. (three-piece can). The two-piece can is a surface-treated steel plate which is subjected to treatments such as tin plating, chrome plating, metal oxide coating treatment, chemical synthesis treatment, inorganic film coating treatment, organic resin coating treatment, oil coating, etc. Press processing, DWI (drawand wall iron), DR〇 (draw_redraw) processing, etc., so that the bottom of the can is formed integrally with the can body, and the cover is mounted by two A can of parts. The two-piece can refers to a can composed of three parts of the top cover and the bottom cover after the surface-treated steel plate is bent into a cylindrical shape or a rectangular tube shape and joined to the ends to form a can body. In these tanks, the proportion of material cost to the cost of the towel is higher than that of I. Therefore, the cost of reducing the cost of the steel plate is strong when the cost of the tank is lowered. Here, it goes without saying that the more the number of processing steps in manufacturing the steel sheet, the higher the cost. Among them, in particular, the annealing step of recrystallizing the steel sheet 098110593 3 200948984 at a high temperature is a step of increasing the manufacturing cost because it consumes a large amount of energy due to heating. Therefore, the industry is considering ways to reduce costs by omitting this step. However, since the steel sheet which is not subjected to recrystallization after cold rolling is in an excessively high strength due to work hardening, it is not suitable for can making. Therefore, a method of obtaining a steel sheet having moderate strength by appropriately controlling the steel composition and hot rolling conditions has been previously studied. For example, Patent Document 1 discloses a method for producing a steel sheet for a can, characterized in that Nb which is a carbonitride forming element is added to an extremely low carbon steel, and hot rolling is performed in a so-called α region below A1·3 point. And after annealing, it is not annealed. However, the steel sheet obtained by the technique of Patent Document 1 is in a state of being cold-rolled, so that the ductility is poor, and it is not sufficient in some applications. As a technique for improving the above aspect, Patent Document 2 discloses a technique in which Nb and Ti which are carbonitride forming elements are added to a very low steel, and hot rolling is performed at a point A1·3 or less, and after cold rolling. Low temperature annealing is performed to improve the ductility. The term "low temperature annealing" as used herein refers to a treatment performed at a temperature at which no recrystallization occurs, so that the energy cost for heating is lowered. Further, Patent Document 3 discloses a technique of adding Nb, Ti, Zr, V, and yttrium belonging to a carbon gasification forming element to an extremely low carbon steel, and performing hot rolling at a point below, and after cold rolling, Annealing is performed at a temperature below the recrystallization temperature. [Patent Document 1] Japanese Patent Laid-Open No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. A common feature in the background art of 3 is the use of very low carbon steel: for the steel's further addition of carbonitride forming elements, and pure under the paper point. Lang, under this condition, there is a poor uniformity of the thickness of the steel sheet in the direction of the length of the coil. Correction, in the patent literature

/, Patent Document 3 _ after the cold milk annealing, according to the embodiment is carried out in the case of more than 400d, the mismatch with the previous recrystallization is lower than the lower temperature, but the heat is high The treatment of τ is not sufficient in terms of sufficiently reducing the energy cost required for heating.

The present invention has been developed in view of the above circumstances, and an object of the present invention is to provide a method for producing a steel sheet for can making, which is to avoid the cold rolling in the case of attempting to reduce the manufacturing cost of the steel sheet by omitting the recrystallization annealing step. The excessive strength due to work hardening reduces the variation in the thickness of the steel sheet coil in the longitudinal direction, and maximizes the cost reduction effect caused by omitting the recrystallization annealing step. The gist of the present invention is as follows. [1] A method for producing a steel sheet for can making, characterized in that: steel is buried in steel by continuous casting, and hot rolling is performed at a finishing temperature below An transformation point, and is wound and pickled. Thereafter, cold rolling is performed at a rolling reduction ratio of 5 〇 to 96%, and the steel-based steel component contains, by weight %, c: 0.005% or less, Μη: 〇.〇5 to 0.5%, Α1: 0.01 to 0.12%, Ν : 0.0010~0.0070%, β : 〇.ΐ5χ 098110593 5 200948984 N~0·75χΝ (in atomic ratio '〇.2〇χΝ~0.97χΝ)' and further contains Nb: 4xC~20xC (in atomic ratio) One or two of 〇.52xC~2.58xC), Ti: 2χ C~10xC (in atomic ratio, 〇.5〇xC~2.51xC), and the remainder consists of Fe and unavoidable impurities. The steel of the elements. [2] The method for producing a steel sheet for can making according to the above [1], wherein the winding is carried out at a temperature of from 64 Torr to 75 °C. [3] The method for producing a steel sheet for can making according to the above [1] or [2] wherein, after the cold rolling, heat treatment is performed at a temperature of 150 to 400 °C. Further, in the present invention, the % of the components representing steel is % by weight. According to the present invention, the reduction in the manufacturing cost of the steel sheet can be achieved by omitting the recrystallization annealing step. Further, a steel sheet having a variation in the thickness of the squash coil in the longitudinal direction can be obtained. As described above, the recrystallization annealing is omitted, and a steel sheet having a variation in the thickness of the steel sheet coil in the longitudinal direction can be obtained, whereby a steel sheet having a lower cost can be produced, and the cost of the tank itself can be reduced. . [Embodiment] Hereinafter, the present invention will be described in detail. Steel in the = Ming (4) _ crane _ the end of the extremely low carbon; r3 point of the temperature of the wire, and further into the thickness of the steel coil in the direction of the thickness of the discussion, the next 'detailed' . The cost of the month First, the reasons for limiting the steel components are explained separately. 098110593 200948984 c ·· 0.005% or less The present invention is a method for producing a steel sheet for can making which is intended to reduce the cost by omitting the recrystallization annealing step. However, since the steel sheet which is not subjected to recrystallization after cold rolling is in an excessively high strength due to work hardening, and the ductility is also poor, it is not suitable for can making. Therefore, it is necessary to use low-strength steel as the steel itself in advance. Therefore, it is necessary to use extremely low carbon steel which has reduced carbon of high solid solution strengthening energy as a steel component. If C exceeds 0.005%, the steel will become too high in strength and inferior in ductility after cold rolling, and thus it is not suitable for can making. Therefore, the content of c is made 0.005% or less', preferably _3% or less. Further, in the case where the low-strength steel is used in advance as the steel itself, the lower the content of c, the better, but it takes time to perform the decarburization operation in order to lower the content of c, which leads to an increase in manufacturing cost. Therefore, the lower limit of the 'C content is preferably 05% or more, and more preferably 15% or more. Μ η : 0.05 to 0.5% If the content of Μη is less than 0·05%, it is difficult to avoid the so-called brittleness _ sh ess if the s content is lowered, and problems such as surface cracking may occur. On the other hand, if it exceeds 〇·5〇/0, the metamorphic point is too low, and the hot rolling below the metamorphic point is yelling. 0, the hidden content is set to (10) above and below 0.50%. Further, in the case where the workability is particularly emphasized, it is preferably 0.20% or less. S: 0.008% or less (better conditions) S does not hide the ambiguity of the present invention (4). However, when the S content exceeds _%, when the added content exceeds 〇.%, the MnS which is produced in a large amount in 098110593 7 200948984 becomes a precipitation nucleus, and BN and Nb (C, which are nitrides and carbonitrides). N) and A1N are precipitated, and the hot ductility (h〇t duc touch y) is lowered. Therefore, it is desirable that the S content is set to 〇 8% or less. A1 : 0.01 to 0.12% If the A1 content is less than 〇.01%', the deoxidation effect cannot be sufficiently obtained. In addition, it is not possible to sufficiently obtain the effect of reducing the solid solution N in the steel by forming N and applying ϋ® 'if it exceeds G12%, not only the effects are saturated, but also the intermediates such as oxidized imitation are easily generated. (1) (4). Therefore, the amount is set to 0.01% or more and 0.12% or less. N: 0.0010~〇·〇〇7〇% If N is less than G.G_%, the manufacturing cost of the steel sheet increases, and it is difficult to achieve stable production. Further, in the case of the present invention, the ratio of b to N is very important as described later. If the N content is small, it is difficult to control the B content for maintaining the ratio of B to N within a fixed range. On the other hand, if n exceeds the 〇 〇 surface, then the heat of steel is New Wei. When the N content is 5%, the BN and Nb (N, niobium, and other nitrides and carbonitrides are precipitated to cause embrittlement, especially in continuous casting, the risk of rupture increases. If there is a rupture of the contact, riding on the broken part, the step of cutting the corner or using the step of grinding and nurturing, because of the large amount of labor and cost, will greatly hinder the productivity. Therefore, the N content is set to 〇 _% or more and 0.0070% or less, preferably 〇〇〇44% or less. B ·· 0.15χΝ~〇, 75xn 098110593 200948984 ❹ ❹ B is an important element of the present invention which has a significant influence on the characteristics of the steel sheet. The method of manufacturing a steel sheet for cans which attempts to reduce the cost by omitting the recrystallization annealing step, and therefore (1) adding carbonitride forming elements using steel as the steel (7), and (3) performing the temperature below the Ar3 point. However, the steel plate manufactured under the conditions has a problem that the plate thickness in the longitudinal direction of the steel sheet coil is not uniform. Therefore, the present invention has studied the phenomenon in detail, and as a result, the following findings are obtained: in The medium amount of pure addition can well maintain the thickness of the steel sheet coil in the longitudinal direction. This opinion can be considered as the following mechanism. First, the uneven thickness of the sheet thickness in the longitudinal direction of the steel sheet coil It is produced at the stage of the hot-sand steel plate. It can be considered that the reason is that the deformation resistance is interrupted due to the addition of carbonitride to form a very low-quality singularity from Walston (Wa_Wei became ferrite (We)). The ground changes, so when there is a metamorphosis between the hot-screw brackets, the tension between the hot-rolled brackets and the load of the hot-rolling load will change, resulting in a variation in the thickness of the sheet. It can be considered that by adding B, the deformation resistance can be suppressed. The change of the thickness of the sheet is improved, that is, the focus of the present invention is to appropriately specify the amount of addition of B to suppress the change of the resistance of the (four) shape. As a result of the study, it is known that the amount of addition of B must be In order to obtain this effect, it is necessary to add B in a weight ratio of 0 or more. In addition, if B is added in % by weight or more, then Effect Saturated, but also the cost is increased. Therefore, the amount of B-ΐ5χΝ~〇75χΝ set square (in atom 0_20χΝ~0.97χΝ). 098110593 9 200948984

Nb: 4xC~20xC (in terms of atomic ratio '〇52xC~2 58xC), Ti: 2χ C~10xC (atomic ratio, 〇.5〇xC~2.51xC) or one of two Nb-based carbons The nitride-forming element has an effect of fixing C and N in the steel as precipitates to lower the strength of the steel. In order to fully exert this effect, it is necessary to achieve an addition amount of 4xC or more by weight. On the other hand, if the amount of Nb added is too large, not only the effect of reducing the solid solution C is saturated, but also the production cost is increased because the Nb is expensive. Therefore, it is necessary to suppress the addition amount of the scent to 20xC or less. Therefore, the amount of addition of Nb is set to a range of ~2 〇 x C (in atomic ratio s tens of 〇. 52 x C to 2.58 x C) by weight ratio. The Τι-based carbonitrides form halogens' have the effect of fixing C and N in the steel as precipitates to lower the strength of the steel. In order to fully exert this effect, it is necessary to achieve an addition amount of 2xC or more in terms of a weight ratio. On the other hand, if the amount of ruthenium added is too large, not only the effect of reducing the solid solution c is saturated, but also the production cost is increased by the price of Tl. Therefore, it is necessary to suppress the addition amount of Ti to below the pulse. Therefore, the addition amount of Ti is set to a range of % 1 〇 x C (in terms of atomic ratio, 〇 5 () x C 〜 2 51 x C) by weight. Further, the remainder other than the above is composed of Fe and unavoidable impurities. As the inaudible impurity, for example, the following elements may be contained within the range of the side effects of the present invention.

Si ·· 0.020% or less When the Si content exceeds 0.020%, the surface properties of the steel sheet are deteriorated. Not only is the surface-treated steel sheet unsatisfactory, but the steel is hardened and it is difficult to carry out the hot milk step 〇 9811〇593 200948984. Therefore, the Si content is preferably 〇 〇 2 〇 or less. P: 0.020% or less. Therefore, by reducing the P content, the effect of improving the mixing and the recording resistance can be obtained, but excessive reduction causes an increase in the manufacturing cost, and the 'p content is preferably 0.020. %the following.

... In addition to the above-mentioned components, it may contain unavoidable impurities such as Cr and cu. However, these components are affected by the gender of the sun and the moon. Therefore, it can be contained within a range that does not affect other characteristics. . Further, elements other than the above may be added without causing a π-material _ for the characteristics of the steel sheet. Next, the reasons for limiting the manufacturing conditions will be explained. The steel sheet for can making of the present invention can be obtained by the following method: • Steel which is adjusted to the above chemical composition range by continuous assembly, and is reduced in the finishing temperature below the known deformation point, and is recorded and wound. After pickling, the material was subjected to a rolling reduction of 5 G to 96%. It is difficult to perform the above winding at a temperature of 64 G to 75 () t. More preferably after the above cold rolling, at 15G ~ Cui. Heat treatment at a temperature of ^. Hereinafter, the details will be described. Hot rolling conditions Energy-cutting temperature of hot rolling: Below the Ah point of hot rolling The finishing temperature of hot rolling is an important requirement in the present invention. By subjecting the steel of the component specified in the present invention to hot rolling at a finishing temperature below the Ah transformation point, a fiber material capable of withstanding the can and I can be obtained. It can be considered that the reason is that by hot rolling below the Α1·3 metamorphic point, the particle size of the hot-rolled steel sheet becomes 098110593 11 200948984, which is sufficiently coarse, the work hardening in cold rolling is suppressed, and the strength after cold rolling is not There will be excess. Further, the A1·3 metamorphic point can be obtained as a temperature which is caused by a volume change of the A1·3 metamorphosis in the processing heat treatment test in the hot rolling process and the heat history test. The steel component specified in the present invention has a metamorphosis point of about 9 〇〇 ° C, and the finishing temperature is lower than the temperature, but in order to achieve this reliably, it is desirable to set it to 860 ° C. the following. In addition, although the detailed mechanism is not clear, the uniformity of the structure is excellent and the material is stabilized by making the total rolling reduction ratio of the Ar3 transformation point below 40% or more and the final reduction ratio is 25% or more. Sexuality is improved. In order to further improve the above effects, it is preferred to have a total reduction ratio of 50% or more and a final reduction ratio of 3 〇 0 / 〇 or more. Further, by setting the inlet side temperature of the finishing mill to 95 CTC or less, hot rolling can be reliably performed below the Ah transformation point, and uniformity of the structure can be achieved, which is more preferable in the present invention. The detailed mechanism cannot be fully clarified, but it is presumed that it is related to the particle size of the Worth field before the start of finish rolling. From the viewpoint of preventing the occurrence of scale, it is more preferable to set the temperature at the inlet side of the finishing mill to 920 ° C or lower. Winding temperature: 640 to 750 ° C (suitable conditions) The winding temperature must be set in such a way as not to cause an obstacle to the next step, pickling and cold rolling. That is, when winding at a temperature exceeding 750 ° C, not only the thickness of the steel sheet is significantly increased, but also the descaling property during pickling is deteriorated, and sometimes 098110593 12 200948984 = high temperature strength of the TL plate itself The deformation of the coil is caused by the decrease, etc. == If the thief is less than 6 thieves, the heat retention effect after winding is not sufficient, and the particle size of the hot-rolled steel sheet is difficult to be sufficiently coarsened. The steel plate is subjected to cold rolling conditions after pickling: the rolling reduction ratio is 50 to 96%, and the cold rolling after pickling is such that the dry shrinkage ratio is 5 〇 to 96%. If the shrinkage rate is not full, the crystal structure becomes not (4), so the deformation will be uneven when the can making process, and the surface of the product becomes _. In addition, the cold rolling also plays a role in adjusting the shape of the steel sheet. Therefore, it is necessary to perform the above-mentioned (10) on these aspects. In addition, the upper limit depends on the strength and thickness of the product deemed to be necessary, and the equipment capacity of hot rolling or cold rolling. However, if it is more than 96%, it is difficult to avoid the deterioration of local ductility, so it cannot be applied except for extremely special. Heat treatment temperature after cold milk: 15 〇 ~ 4 〇〇 ° C (suitable conditions)

. When heat treatment is performed after cold rolling, the heat treatment temperature is set to 15 〇 to shed c. The recrystallization temperature of the component of the present invention is about 73 (rc or more, and therefore does not cause recrystallization at (9) 400 C, but according to the content relationship of C, Nb, N, and B as defined in the present invention' The heat treatment in the temperature range can achieve a decrease in strength and an improvement in ductility. This phenomenon can be considered to soften at a temperature at a low taste, so that it is easy to diffuse at this temperature (:, ?^, etc. It is caused by the poor row interaction introduced by cold rolling. That is, it can be considered that the solid solution of the ferrite 098110593 13 200948984 is obtained by the content relationship of C, Nb, Ti, N, B as defined in the present invention ( :,; ^ to achieve the desired state, whereby the decrease in strength and the improvement in ductility can be obtained at a lower temperature. In particular, it can be considered that the influence of the addition condition of B specified in the present invention is significant. Forming bn with n causes the fixed N to decrease, the solid solution B to segregate to the grain boundary to prevent the segregation of c and N to the grain boundary, and the difference between the C and N adhesions introduced by cold rolling in the matrix by heat treatment. The state of the row becomes sticky and is released, and can be obtained The decrease in strength and the improvement in ductility. The temperature at which the lower limit of the improvement effect can be expected is 15 。. On the other hand, if the temperature reaches 40 (TC or more, the strain energy in the cold rolling is large. The crystal grains of the bismuth are preferentially restored, resulting in uneven deformation during the potting process, and the surface of the product becomes coarse. Therefore, the heat treatment temperature after the cold is 15 〇 to 4 G ( Further, in order to stably obtain strength and ductility, the heat treatment temperature is preferably in the range of 200 to 350 ° C. Further, as long as the heat treatment time is sufficient, the element is sufficient for the solid solution element to be inferred from the present invention. The time for leaving the difference row is not limited, but is preferably in the range of about 1 〇 to 90 s. [Examples] [Example 1] Hereinafter, examples will be described. Various steels shown in Table 1 are cast and cast. The billet is made into a billet, which is heated and rolled at a heating temperature of 11 〇〇 to 125 〇◦C, and hot rolled at the finishing temperature of the watch, and then wound at a winding temperature. _, pickling After that, cold rolling is performed at a rolling reduction rate of 90%. 098110593 14 200948984 The thickness variation of the steel sheet obtained by the above method was evaluated. The thickness variation was measured by the X-ray thickness gauge provided in the cold-rolling equipment, and the length of the steel coil was measured. The plate thickness is evaluated as a rate of change with respect to the average plate thickness, and the rate of change is considered to be acceptable as ±3% or less of the product, and is expressed as 合格, and the rate of change exceeding ±3% is regarded as not In addition, in Table 1, the finishing temperature of hot rolling is regarded as 〇 · · · 3 3 3 3 四 四 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 For X, the results obtained by the above method are shown together with the conditions.

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ISI 161 03 - SSI 1860 200948984 • From Table 1, it can be seen that in the example of the present invention, the variation in the thickness of the sheet is ±3% or less, and the steel sheet in which the thickness variation in the longitudinal direction of the steel sheet coil is suppressed has been obtained. In other words, it is understood that the suppression of the thickness (4) of the first object of the present invention is solved by satisfying the conditions specified in the first invention as shown in the table. [Example 2] The various steels shown in Table 2 were made into steel, and heated at a heating temperature of biliary to (10) ° C, and then at a temperature below the Μ metamorphic point, that is, under the temperature of 8 wrists. Hot rolling was performed, and then winding was performed at the winding temperature shown in Table 2. Then, pickling was carried out, and cold milk was carried out at a rate of (10) shown in Table 2. The plate thickness variation of the steel sheet which was whipped by the above method was evaluated. The thickness of the steel sheet was measured by the thickness of the steel sheet coil by the thickness of the steel sheet coil, and the thickness of the sheet was measured with respect to the average sheet thickness. The evaluation results are shown in Table 2. The rate of change is considered to be qualified as *3 Α or less of the product. * It is expressed as 〇, and the rate of change exceeds the evaluator. Then, the steel sheets were heat-treated at 3 s in the heat treatment temperature shown in Table 2. Thereafter, two surface treatments were carried out. A type of tin-free steel sheet (hereinafter referred to as TFS (Tin Free Steel)) is formed on the surface clock Cr, and a polyethylene terephthalate (PET) resin film is further laminated. The other is to form a tin-plated steel sheet by plating Sn on the surface. The PET resin film laminated on the TFS was processed into a DRD can having an extrusion ratio of 2.2 and the roughness of the can body and the bottom of the can was evaluated by visual inspection at 098110593 17 200948984. There is no such thing as a good balance between the price and the excellent, good, and poor boundaries. (4) There is a slight change in the experience. Here, the poor, the wealth of the dress, the "range of nn heart" , , ~ 〜 粗 粗 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 The welding can of mm is subjected to flange processing with an expansion ratio of 6% and 8%, and the occurrence of flange cracking is evaluated. The evaluation result is that no crack is generated in the flange processing of 6% and 8%. 〇, even if cracking occurs in the 8% flange processing, if no crack occurs in the 6% flange processing, it is recorded as △, and cracks will be generated in the 6% and 8% flange processing. The results obtained are shown in Table 2. 098110593 18

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The present invention is most suitably used as a food can or a beverage can. Moreover, in addition to the above, the organic resin film laminated steel sheet as assumed in the present invention is formed as a DVD-, stretched, before the damage. Avoid _, 昜 and require the extraction of the tank.

098110593 20

Claims (1)

200948984 · VII. Patent application scope: 1. A method for manufacturing steel plate for can making, characterized in that steel is made into steel slab by continuous scale and skin, and hot rolling is performed at a finishing temperature below An transformation point. After being wound and pickled, the steel is cold-rolled at a rolling reduction ratio of 50 to 96%, and the steel-based steel component contains C·· 0.005% or less and Mn: 〇〇5 to 0.5% by weight%. Al : 〇.〇1 ～0.12%, Ν: 0.0010~〇.〇070〇/〇, β: 〇15χΝ to 0.75χΝ (in atomic ratio, 〇.2〇xN~0.97χΝ), and further includes ❹ Nb : one or both of 4xC to 20xC (in terms of atomic ratio, 52.52xC to 2.58xC), Ti: 2xC to 10xC (in atomic ratio, 〇.5〇xC to 2.51xC), and The remainder consists of steel composed of Fe and inevitable impurity elements. 2. The above-mentioned winding is carried out at a temperature of 640 to 750 ° C as in the method for producing a steel sheet for can making of the first application of the patent application. 3. The method for producing a steel sheet for can making according to claim 1 or 2, wherein after the cold rolling, heat treatment is performed at a temperature of 150 to 40 (TC temperature: 098110593 21 200948984. : (1) The representative representative of the case is: No (2) The symbol of the symbol of the representative figure is simple: <,,, 5. If there is a chemical formula in this case, please disclose the chemical formula that best shows the characteristics of the invention: 098110593