WO2008105524A1 - 缶用鋼板およびその母材に用いる熱延鋼板ならびにそれらの製造方法 - Google Patents
缶用鋼板およびその母材に用いる熱延鋼板ならびにそれらの製造方法 Download PDFInfo
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- WO2008105524A1 WO2008105524A1 PCT/JP2008/053589 JP2008053589W WO2008105524A1 WO 2008105524 A1 WO2008105524 A1 WO 2008105524A1 JP 2008053589 W JP2008053589 W JP 2008053589W WO 2008105524 A1 WO2008105524 A1 WO 2008105524A1
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Classifications
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- 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- 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
- C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
-
- 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
- C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
- C21D8/0421—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the working steps
- C21D8/0426—Hot rolling
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- 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
- C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
- C21D8/0421—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the working steps
- C21D8/0436—Cold rolling
-
- 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
- C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
- C21D8/0447—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the heat treatment
- C21D8/0473—Final recrystallisation annealing
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
- C21D9/48—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals deep-drawing sheets
-
- 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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- 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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
Definitions
- the present invention relates to a steel plate for tin (tin mill black plate) and a hot-rolled steel sheet used as a base material thereof.
- the present invention also relates to a method for producing a hot-rolled steel sheet for the base steel sheet for cans.
- the present invention relates to a steel plate for cans having high ductility, high strength and low anisotropy ( ⁇ ) (in-plate plastic anisotropy), a hot-rolled steel plate used as a base material thereof, and a method for producing them. is there. Background art
- One way to reduce can manufacturing costs is to reduce the cost of materials. In other words, even in 2-piece cans that are drawn (drawing) and 3-piece cans mainly made of simple cylindrical forming, the use of thinner steel sheets (gauge down) is being promoted. .
- these ultra-thin and hard steel plates for cans are manufactured by the Double Reduce method (hereinafter referred to as DR method) in which secondary cold rolling is performed after annealing.
- Steel sheets produced by the DR method are characterized by high strength and low yield point elongation.
- DRD can drawn and redrawn can
- the DR method is effective.
- DRD cans require low earing, but the DR method tends to generate anisotropy because it tends to increase anisotropy, and anisotropy (A r) prevents earing. There is a problem of making it smaller.
- DR material with poor ductility is inferior in workability and is difficult to apply to deformed cans.
- DR has a higher production cost because it requires more production steps than steel sheets that are subjected to temper rolling (pressure regulation) after normal annealing.
- temper rolling pressure regulation
- various strengthening methods are used in the Single Reduce method (SR method), which mainly controls the properties in the cold rolling and annealing processes.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2001-107186
- C and N a total of more than 0050 mass%
- bake hardening the strength is as high as that of DR material.
- Patent Document 2 Japanese Patent Laid-Open No. 11-199991 (Patent Document 2) also proposes a technique for increasing the strength by baking after coating, as in Patent Document 1.
- aging by solid solution C (solute C) (about 5 to 15 ppm) is mainly used, and continuous annealing is performed. Is decarburized.
- N is not used as an aging element, but is precipitated and fixed as A1N by scraping at S00 ° C or higher (approximately 680 ° C). The resulting bake hardening is about 40-55 MPa.
- Patent Document 3 JP 2005-336610 (Patent Document 3) describes precipitation strengthening by Nb carbide.
- JP-A-59-129733 Patent Document 4
- the yield elongation is set to about 1.0% or less by suppressing C to 0.0030% or less and performing temper rolling of 10% or more.
- a production method has been proposed in which the generation of strechture strain is prevented and a steel having a strength level equivalent to T 4 to T 6 is obtained.
- Patent Document 5 an average crystal grain size obtained at a primary cold pressure of 80 to 88% is 6 ⁇ m or less, stretch yarn strain is not generated, and ear generation rate is low. (A r is within ⁇ 0.1) Ultra-thin steel sheets have been proposed.
- Patent Document 6 proposes a technique for obtaining a high-strength steel sheet by using fine graining by transformation.
- low-carbon steel is hot-rolled in the ⁇ + ⁇ region and then cooled at a high speed, and the heating rate for annealing is regulated to refine the steel sheet, resulting in a tensile strength of 600 MPa and a total elongation of 30% or more.
- the steel plate which has is obtained. Disclosure of the invention
- the same plate thickness as the DR material is essential to secure strength in order to reduce the thickness.
- the same plate thickness as the DR material is essential to secure strength in order to reduce the thickness.
- the yield strength In order to obtain the current can strength with steel plates (about 0.15-0.18mm), the yield strength must be 500 MPa or more.
- steel with a high ear occurrence rate on 2-piece cans such as D RD cans When this is applied, the trim margin of the ear increases and the yield decreases. Therefore, a steel sheet with low ear generation, that is, low anisotropy is desired.
- Patent Document 2 age hardening is performed by baking treatment, but the tensile strength of the steel described in the examples is up to about 38 OMPa, and the yield strength of 500 MPa or more, which is the target in the present invention, cannot be obtained.
- Patent Document 3 high strength by composite strengthening such as precipitation strengthening and solid solution strengthening is used, but generally steel using precipitation strengthening is inferior in anisotropy, and in particular, the hot rolling conditions proposed in Patent Document 3 Then, the target anisotropy in the present invention cannot be obtained.
- Patent Document 4 describes T 6 level steel that yield elongation is almost zero, it is necessary to perform temper rolling at a rolling rate of 10% or more, which is substantially the same as DR material. Manufacturing method and high cost. In addition, there is no description to manufacture steel with a T6 value. Furthermore, although there is no description about ductility in the specification, it is estimated that if the rolling is performed at a rolling reduction of 10% or more, the ductility is inferior.
- Patent Document 5 discloses a method of manufacturing a steel sheet that suppresses the generation of ears by controlling manufacturing conditions such as components and hot rolling conditions.
- the yield strength of steel described in the examples is 420 MPa. However, it does not reach the target of 500 MPa or more.
- Patent Document 6 The high strength by rapid cooling proposed in Patent Document 6 increases the operational cost. Become. Further, the anisotropy targeted in the present invention cannot be obtained in the structure obtained in Patent Document 6. This is compared with the technology of the present invention described later. In the technology of Patent Document 6, the temperature range of 80 ° C. or more is achieved at a cooling rate of 100 ° C./s or more within 1 s after the end of hot rolling. It is thought that this is related to the fact that the crystal grains of the hot-rolled steel sheet do not grow sufficiently.
- the present invention has been made in view of such circumstances, and has a yield strength of 500 MPa or more after paint baking, a yield ratio of 0.9 or more, a total elongation of 10% or more, and ⁇ r is ⁇ 0.50 to
- An object of the present invention is to provide a steel plate for cans that is 0, a hot-rolled steel plate that is a base material thereof, and a method for producing the same.
- the present inventors have intensively studied to solve the above problems. As a result, the following knowledge was obtained.
- the present inventors paid attention to a complex combination of solid solution strengthening, precipitation strengthening, grain refinement strengthening, and age hardening.
- solid solution strengthening is performed using solid solution strengthening elements, and combined strengthening by solid solution strengthening with Nb, P, and Mn, precipitation strengthening and grain refining hardening is achieved.
- solute C and solute N in steel the strength is increased by age hardening after paint baking.
- the microstructure into a substantial single phase of ferrite and prescribing the ferrite average crystal grain size, both high strength and high ductility are maintained, yield strength of 500 MPa or more, and total elongation of 10% or more are obtained. It is done.
- the anisotropy is improved by appropriately controlling the hot rolling conditions, and ⁇ r is reduced to 1 ⁇ 50. It can be set to ⁇ 0.
- the production method of the steel plate for high strength and high ductility cans has been completed.
- the present invention has been made based on the above knowledge, and the gist thereof is as follows.
- the paint baking process is a process of applying heat treatment at 210 ° C. for 20 minutes, which is equivalent to paint baking, and is different from a so-called baking hardening process in which pre-strain is applied and an aging process is performed.
- Figure 1 shows the anisotropy ( ⁇ ⁇ ) (vertical axis) of the steel plate for cans (cold rolled steel plate) and the average crystal grain size of the hot rolled steel plate that is the base material for the steel plate for cans (horizontal axis: ⁇ ⁇ ).
- the steel sheet for cans according to the present invention has a high strength ductility that can provide steel sheet properties of yield strength of 500 MPa or more, yield ratio of 0.9 or more, total elongation of 10% or more, and ⁇ r—0.50-0 by paint baking. It is a steel plate for cans.
- the paint baking treatment is based on a treatment at 210 ° C for 20 minutes, but if it is heat treatment at 180-265 ° C for 2-30 minutes, almost the same effect can be obtained.
- a heat treatment for age hardening it is not a paint baking process but a laminating process.
- heat laminating may be performed.
- the term “paint baking” includes similar heat treatment such as laminating.
- the steel plate for cans which has been subjected to paint baking treatment and has the above steel plate characteristics is also a steel plate of the present invention.
- the coating baking process conditions also conform to the above criteria, but there is no particular limitation as long as the steel sheet characteristics can be obtained.
- steel sheets strengthened using the DR method show only a few percent elongation.
- a steel sheet strengthened by solid solution strengthening, precipitation strengthening, and grain refinement strengthening by Nb, P, and Mn is manufactured by continuous annealing, thereby increasing strength while maintaining high elongation. It is characterized by.
- aging hardening of 30 MPa or more is caused by heat treatment that is essential in the can manufacturing process such as paint baking.
- heat treatment that is essential in the can manufacturing process such as paint baking.
- ⁇ a value in the range of -0.50 to 0 Get.
- the yield strength is 500 MPa or more and the yield ratio is 0.9 or more.
- a steel plate for cans having a total elongation of 10% or more and an ⁇ r of ⁇ 0 ⁇ 50 to 0 is obtained.
- the component composition of the steel plate for cans of this invention is demonstrated.
- the steel plate for cans of the present invention it is essential to achieve a strength of a predetermined level (yield strength of 5 OOMPa or more) after continuous annealing and temper rolling, and at the same time to have a total elongation of 10% or more.
- the ferrite average crystal grain size must be 7 / xm or less. C content is important when manufacturing steel sheets that meet these characteristics.
- the amount and density of carbides are strongly related to the strength and ferrite average crystal grain size of steel sheets, so it is necessary to secure the amount of carbon that can be used for precipitation.
- by precipitating carbides at the grain boundaries segregation of P grain boundaries can be suppressed, and P solid solution strengthening can be utilized to the maximum.
- the lower limit of the C addition amount is limited to 0.01%.
- the upper limit is limited to 0.12%.
- the desirable lower limit is 0.04% or more, and the desirable upper limit is 0.10% or less.
- Si is an element that enhances the strength of steel by solid solution strengthening, but if it is contained in a large amount, the corrosion resistance force S is significantly impaired. Therefore, the upper limit of Si content is limited to 0.5%. Preferably it is 0.05% or less. On the other hand, Si needs to be as low as possible in applications that require high corrosion resistance, but the lower limit is limited to 0.005% in consideration of reduction costs.
- Mn 0.3 ⁇ 1.5% Mn increases the strength of steel by solid solution strengthening and also reduces the grain size. The effect of reducing the crystal grain size is prominent.
- the Mn content is 0.3% or more, and a Mn content of at least 0.3% is necessary to ensure the target strength. Therefore, the lower limit of the Mn content is limited to 0.3%.
- the upper limit is limited to 1.5%. Preferably it is 1.1% or less.
- the upper limit is limited to 0.2%. Preferably it is 0.1% or less.
- the lower limit is limited to 0.005%.
- the recrystallization temperature increases, so the annealing temperature must be increased.
- other elements added to increase the strength also increase the recrystallization temperature and increase the annealing temperature, so it is a good idea to avoid the increase in recrystallization temperature due to A1. Therefore, the upper limit of A1 content is limited to 0.10%.
- N is an element effective for increasing age hardening. In order to exert the effect of age hardening, it is desirable to add 0.005% or more, preferably 0.0060% or more. On the other hand, when added in a large amount, hot ductility deteriorates, and slab cracking is likely to occur in the unbending zone during continuous fabrication. Therefore, the upper limit of N content is limited to 0.012%. If age hardening by N is not actively used, a content of about 0.001 to 0.004% is sufficient, but in that case YS will be low unless other reinforcing elements are added excessively.
- Nb is an important additive element in the present invention. Nb is an element with a high ability to generate carbides, and precipitates fine carbides to increase strength. Also, Ferai 8 053589
- the strength is increased by making 10 grains fine. Moreover, the particle size affects not only the strength but also the surface properties during drawing. If the average grain size of ferrite in the final product exceeds 7; x m, after the drawing process, some rough skin will occur and the appearance of the surface will be lost. As described above, the strength and surface properties can be adjusted depending on the amount of Nb added, and this effect occurs when it exceeds 0.005%. Therefore, the lower limit is limited to 0.005%. Preferably it is 0.01% or more.
- Nb increases the recrystallization temperature. Therefore, if it is contained in an amount exceeding 0.10%, a portion of unrecrystallized remains in the continuous annealing performed at a soaking temperature of 650 to 750 ° C and a soaking time of 40 s or less as defined in the present invention. It becomes difficult to anneal. As a countermeasure, if the annealing temperature is raised, a recrystallized structure can be obtained, but the surface properties are inferior because the elements in the steel are concentrated in the surface layer. Therefore, the upper limit of Nb addition is limited to 0.10%. Preferably it is 0.06% or less.
- the balance of the steel sheet composition is Fe and inevitable impurities. For example, S is an inevitable impurity.
- the present invention it is assumed to consist essentially of ferrite single phase structure.
- “substantially” means that it is equivalent to a ferrite single-phase structure from the viewpoint of the effect of the present invention. For example, even if it contains about 1% or less of cementite or the like, it can be determined that it is substantially a ferrite single-phase structure as long as the effects of the present invention are exhibited.
- the average ferrite crystal grain size when the average ferrite crystal grain size exceeds 7 ⁇ m, the appearance of the surface after canning is lost. This is considered to correspond to an extreme change in surface roughness such as rough skin. In particular, this phenomenon is observed in the body of weld cans of 2-piece cans and in the body of 3-piece cans where canning is performed. Based on the above, the average ferrite crystal grain size should be 7 ⁇ m or less.
- the lower limit of the average ferrite crystal grain size is not particularly limited, but is usually about 4 ⁇ m or more.
- the ferrite crystal grain size is measured using the cutting method specified in JIS G0551.
- the ferrite average crystal grain size is controlled to the target value mainly by adjusting the steel plate composition, cold rolling rate, and annealing temperature. Specifically, C: 0.01 to 0.12%, Si: 0.005 to 0.5%, Mn: 0.3 to 1.5%, P: 0.005 to 0.2%, A1: 0.10% or less, N: 0.012% or less, Nb: 0.005 to 0.10 % (Or a suitable range of these) (the balance is inevitable impurities from iron), hot-rolled at a finishing temperature of 870 ° C or higher, and a speed of 40 ° C / s or lower until scraping.
- Yield strength is an important factor in securing the dent strength of welded cans.
- the dent resistance is expressed by the relation between the plate thickness and the yield strength.
- the yield strength should be 500 MPa or more in order to ensure the dent strength with the thickness of the DR material (usually 0.15-0.17 mm).
- YP and TS are controlled to target values mainly by adjusting the steel plate composition, cold rolling rate, and annealing temperature.
- C 0.01 to 0 ⁇ 12%
- Si 0.005 to 0.5%
- A1 0.10% or less
- Nb As a composition containing 0.005 to 0.10% (or suitable range thereof) (the balance is iron unavoidable impurities), hot rolling at a finishing temperature of 870 ° C or higher, and 40 ° C until scraping After cooling at a speed of 620 ° C or higher after cooling at a rate of less than / s / s, 80% or less
- the target value can be controlled by performing continuous annealing under the conditions of soaking temperature: 650 to 750 ° C, soaking time: 40 s or less.
- YP and YR before baking are not particularly limited, but are about 450 to 550 MPa and 85 to 95, respectively.
- the stretch is less than 10%, for example, it will be difficult to apply steel sheets to cans with high can body processing such as can expansion. Therefore, the total stretch is 10% or more.
- the upper limit of total elongation is not particularly limited, but generally the upper limit is about 50%. Using the above-mentioned funite single phase fine grain structure is particularly effective as a means of ensuring a total elongation of 10% or more.
- > E1 before baking is not particularly limited, but it is about 15-50%.
- ⁇ r represented by the following formula is used as an anisotropy index.
- r 0 is a tensile test in the rolling direction
- r 45 is a tensile test in the direction of 45 ° with the rolling direction
- r go is a tensile test in the direction of 90 ° with the rolling direction Indicates the r value (Lankford value) of the hour.
- ⁇ r For steel sheets with r less than -0.50, for example, when processed into a D R D can, the trim margin becomes large due to large ear formation and the yield of the steel sheet decreases. That is, ⁇ r needs to be in the range of 0.50 to 0 in order to suppress the amount of ear generation from the viewpoint of yield. Also, if the absolute value of A r is large, flange wrinkles will occur in the flange part of DRD cans and welded cans due to the circumferential thickness distribution (thickness deviation). ⁇ r:-0 It is desirable to use 45 ⁇ .0 steel. Furthermore, in applications where the roundness of the can is important, it is necessary to suppress the plate thickness distribution in the circumferential direction as much as possible. Therefore, it is desirable to set ⁇ r to 0.30-0.
- ⁇ r is controlled to the target value mainly by adjusting the finishing temperature during hot rolling, the cooling rate after finishing, and the winding temperature. Specifically, ⁇ r is hot-rolled at a finishing temperature of 870 ° C or higher, cooled to 40 ° C / s or less until scraping, and 620 ⁇ or higher. It can be controlled to the target value by scraping the coil with temperature.
- ⁇ r before baking is not particularly limited, but is generally close to that after baking.
- the structure of the hot-rolled steel sheet for the steel plate matrix for cans will be described.
- Hot-rolled steel sheet structure Fulite single-phase structure, average grain size of 6 zm or more
- the structure of the hot-rolled steel sheet is substantially ferrite single-phase yarn and weave.
- the meaning of “substantially” is the same as in the case of cold-rolled steel sheet (cold rolled, annealed, temper rolled), and even if it contains about 1% or less of cementite, etc. As long as it plays, it is judged that it is substantially a ferrite single phase structure.
- Fig. 1 The anisotropy of the steel sheet after cold rolling, continuous annealing, and temper rolling is greatly affected by the ferrite grain size at the hot-rolled steel sheet stage.
- Fig. 1 was obtained by performing continuous annealing on steel 1 shown in the examples described later at a cold rolling reduction of 90%, a soaking temperature of 710 ° C, and a soaking time of 30 s. It shows the relationship between the anisotropy of cold-rolled steel sheet and the average ferrite grain size at the hot-rolled steel sheet stage (hot-rolled material). According to Fig. 1, if the ferrite average grain size of the hot-rolled material is less than 6 / Xm, ⁇ r is less than 1.50, and the desired anisotropy value cannot be obtained.
- the ferrite average crystal grain size in the hot-rolled material is 6 m or more.
- the ferrite average crystal grain size in the hot-rolled material is 7 ⁇ m or more.
- the ferrite average crystal grain size in the hot rolled material is 8 ⁇ m or more.
- the average ferrite grain size in hot-rolled materials is usually about 15 / im or less. The method for measuring the ferrite crystal grain size is the same as for cold-rolled steel sheets.
- the crystal grain size of the hot-rolled material is controlled to the target value mainly by adjusting the components, FT during hot rolling, cooling rate to CT, and CT.
- the thickness and aging index is not particularly limited in the claims, but desirable conditions for implementing this patent are within the ranges shown below.
- Suitable thickness of steel plate for cans 0.2 or less, Suitable thickness of hot-rolled steel plate: 2 mm or less
- Thickness is mainly used at 0.2 mm or less.
- the steel should be rolled at a rolling rate of about 94% or less. Is desirable. For this reason, the thickness of the hot-rolled material is preferably 2 mm or less. • Aging index: 30MPa or more
- the aging index refers to the amount of age hardening when heat treatment is performed at 100 ° C. for 60 minutes after applying 8% pre-strain.
- a hot-rolled steel sheet is obtained by hot rolling using the rolling material obtained as described above.
- the rolling stock Prior to hot rolling, the rolling stock is desirably heated to at least 1250 ° C (SRT ⁇ 1250 ° C) o This is to complete solid solution of N in the steel.
- the rough rolling start temperature is preferably 1350 ° C or less.
- the finishing temperature shall be 870 ° C or higher. Cool down at a rate of 40 ° C / s or less until scraping, and scrape at a scraping temperature of 620 ° C or higher. From the viewpoint of anisotropy, the ferrite average grain size of the hot rolled material obtained here should be 6 ⁇ m or more.
- the base material hot-rolled steel sheet is manufactured by the above process, but may be subjected to pickling described below.
- Hot rolling finish temperature 870 ° C or higher
- the finish rolling temperature in hot rolling is an important item in controlling anisotropy.
- the ferritite average grain size of hot-rolled steel should be 6 ⁇ m or more, and the texture should be controlled. is required.
- the hot rolling finishing temperature is 870 ° C or higher.
- FT is preferably set to 950 ° C or less from the viewpoint of suppressing defects due to scale.
- the anisotropy of steel sheets for cans is greatly affected by the ferrite average crystal grain size of hot-rolled steel.
- the ferrite average crystal grain size of the hot rolled material needs to be 6 ⁇ m or more in order to make ⁇ r within the range of 0.50-50.
- the average cooling rate after hot rolling it is necessary to reduce the cooling rate after hot rolling, and the condition is that the average cooling rate after finishing is 40 ° C / s or less.
- the average cooling rate is obtained by dividing the temperature drop from the end of hot rolling to coil winding by the elapsed time.
- the average grain size of the hot rolled material In order to reliably obtain a steel with ⁇ r of -0.45 to O in the entire width direction, it is preferable to set the average grain size of the hot rolled material to 7 m or more, and for this purpose, the average cooling rate Must be 30 ° C / s or less.
- the ferritic average grain size of the hot-rolled material is 8 im or more.
- the cooling rate should be 20 ° C / s or less.
- the average cooling rate is preferably 10 ° C./s or more from the viewpoint of productivity.
- the cooling rate is controlled by the amount of cooling water supplied, for example.
- the cooling rate when water-cooled at maximum strength in a general industrial-scale hot rolling facility is about 80 to 100 ° C / s. In normal hot rolling, from the economical point of view, near this upper limit, The steel sheet is water cooled at least 50 ° C / s.
- the forced cooling means is not used at all, the cooling rate is about s in number. However, since the scraping temperature becomes high and defects due to scale occur, it is not practical as an industrial production means.
- coil winding 9 In order to increase the average ferrite grain size of hot-rolled material to 6 ⁇ m or more, coil winding 9
- the cutting temperature is set to 620 ° C or higher. From the viewpoint of setting ⁇ r to ⁇ 0.45 to 0, it is preferably 640 or more. In addition, in order to obtain a steel with a ⁇ r of -0.30 to 0, it is desirable that the staking temperature is 700 ° C or higher.
- the winding temperature is preferably 750 ° C. or less from the viewpoint of descalability.
- the rolling reduction in cold rolling is one of the important conditions in the present invention. If the rolling reduction in cold rolling is less than 80%, it is difficult to produce a steel sheet with a yield strength of 500 MPa or more. Furthermore, in order to obtain a plate thickness equivalent to that of DR material (0.2 mm or less, usually about 0.17 mm), at a rolling reduction of less than 80%, at least the thickness of the hot-rolled plate must be 1 mm or less. Yes, it is difficult to operate. Therefore, the rolling reduction is 80% or more. It should be noted that with the capacity of general rolling equipment, if the cold rolling rate is excessive, the rolling load increases and rolling becomes impossible, so the upper limit of the cold rolling rate is preferably about 96%.
- Annealing is performed by a continuous annealing method.
- the soaking temperature in continuous annealing must be equal to or higher than the recrystallization temperature of the steel sheet to ensure good workability, and in order to make the structure more uniform, at a temperature of 650 ° C or higher. Soaking up is necessary.
- in order to perform continuous annealing at temperatures exceeding 750 ° C it is necessary to reduce the speed as much as possible to prevent the steel sheet from breaking, and productivity is reduced. 750 ° C or less as a condition that does not reduce productivity.
- the soaking time should be 40 s or less because productivity cannot be ensured at a speed where the soaking time is 40 s or more. There is no particular lower limit on the soaking time. For example, there is no problem even if the soaking time is zero when the soaking temperature (maximum temperature) is reached and cooling is performed immediately.
- temper rolling was performed so that the rolling reduction (measured by elongation) was 1.5% or less, and normal chrome plating (electric plating) was continuously applied to obtain tin-free steel. It was.
- the soaking temperature was adjusted within the range of 690 ° C to 750 ° C depending on the amount of Nb added.
- the plated steel sheet (Tinfuri steel) obtained as described above was subjected to a paint baking process at 210 ° C for 20 minutes, and then a tensile test was performed.
- the crystal structure and average crystal grain size were investigated (Note that the crystal structure and crystal grain size do not change before and after the paint baking process).
- the crystal structure and average grain size of hot-rolled steel sheets were investigated.
- the survey method is as follows.
- R 0 is the tensile test in the rolling direction
- r 45 is the tensile test in the direction of 45 ° from the rolling direction
- r 90 is the tensile test in the direction of 90 ° from the rolling direction The r value is shown.
- the crystal structure (both hot-rolled steel sheet and cold-rolled steel sheet) was observed with an optical microscope after the sample (cross section in the rolling direction) was polished and the grain boundaries were corroded with nital (nitric alcohol solution).
- the average crystal grain size is the crystal structure observed as described above.
- the present invention examples (Nos. 1-6, 20, 21) have a ferrite average crystal grain size of 7 m or less in the annealed material (plated steel sheet) structure, and include a mixed grain structure by structure observation. It was confirmed that there was no uniform and fine ferrite single phase structure. Further, from Table 2, it is recognized that the inventive examples are excellent in both strength and ductility.
- the aging index achieved 3 OMPa in the invention examples (No. 1 to 6, 20) containing N of 0.005% or more, and the invention examples containing No. 1 0060% or more of N (No. 1 2, 4-6, 20) achieved 40MPa.
- the comparative example (No. 7) with an excessive Nb content has insufficient anisotropy
- the comparative example (No. 8) with an insufficient Nb content has insufficient strength.
- the hot-rolled structure was a substantial ferrite single-phase structure having an average particle diameter of 6 m or more.
- a steel slab was obtained by melting steel containing the component composition shown in Table 3 (same as No. 1 in Example 1) and the balance being Fe and inevitable impurities in an actual converter. After the obtained steel slab was reheated at 1250 ° C, hot rolling was started. Hot rolling is performed at a finishing rolling temperature of 830 to 900 ° C, cooling at an average cooling rate of 16 to 45 ° C / s until milling, and milling temperature in the range of 580 to 720 ° C. It was. Next, it was cold-rolled at a rolling reduction of 75 to 94% to produce a 0.15 to 0.18 mm thin steel sheet.
- the obtained thin steel sheet was allowed to reach 630 to 740 ° C at a heating rate of 20 ° C / sec and subjected to continuous annealing at 630 to 740 ° C for 20 to 30 seconds.
- temper rolling was performed so that the reduction ratio was 1.5% or less, and normal chrome plating was continuously applied to obtain tin-free steel.
- Table 4 Detailed manufacturing conditions are shown in Table 4.
- the plated steel sheet (Tinfuri steel) obtained as described above was subjected to a paint baking treatment at 210 ° C for 20 minutes, followed by a tensile test, and the crystal structure and average crystal grain size were investigated. The crystal structure and grain size of hot-rolled steel sheets were also investigated. Each test and adjustment method is the same as in Example 1.
- the hot-rolled structure was a substantial ferrite single-phase structure having an average particle size of 6 / X m or more.
- the present invention has a yield strength of 500 MPa or more, a yield ratio of 0.9 or more, a total elongation of 10% or more, and a high strength and high ductility can having ⁇ r of ⁇ 0.50 to 0. A steel plate is obtained.
- the present invention is based on solid solution strengthening using a solid solution strengthening element, and further performing composite strengthening (solid solution strengthening, precipitation strengthening and grain refinement strengthening) using Nb, 'P, Mn, and the like.
- composite strengthening solid solution strengthening, precipitation strengthening and grain refinement strengthening
- Nb, 'P, Mn, and the like As the strength is increased while maintaining high elongation, steel sheets with a yield strength of 500 MPa or more can be reliably manufactured even if the temper rolling after the annealing process is under a light reduction of about 1.5% or less.
- the finishing temperature is 870 ° C or higher, and the cooling rate until scraping is 40.
- a steel plate having excellent strength, ductility, and anisotropy characteristics can be obtained.
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Abstract
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CN200880003321XA CN101595234B (zh) | 2007-02-28 | 2008-02-22 | 罐用钢板及其母材使用的热轧钢板以及它们的制造方法 |
KR1020097012545A KR101167544B1 (ko) | 2007-02-28 | 2008-02-22 | 캔용 강판 및 그 모재에 사용하는 열연 강판 그리고 이들의 제조 방법 |
EP08712121.6A EP2128289B2 (en) | 2007-02-28 | 2008-02-22 | Steel sheet for cans, hot-rolled steel sheet to be used as the base metal and processes for production of both |
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JP5939368B1 (ja) * | 2014-08-29 | 2016-06-22 | Jfeスチール株式会社 | 缶用鋼板及びその製造方法 |
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WO2017150066A1 (ja) * | 2016-02-29 | 2017-09-08 | Jfeスチール株式会社 | 缶用鋼板およびその製造方法 |
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Also Published As
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EP2128289B2 (en) | 2019-10-23 |
JP2008214658A (ja) | 2008-09-18 |
CN101595234B (zh) | 2012-10-03 |
CN101595234A (zh) | 2009-12-02 |
EP2128289A1 (en) | 2009-12-02 |
EP2128289A4 (en) | 2013-06-26 |
KR101167544B1 (ko) | 2012-07-23 |
EP2128289B1 (en) | 2016-08-10 |
JP5162924B2 (ja) | 2013-03-13 |
KR20090093987A (ko) | 2009-09-02 |
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