WO2010101074A1 - 曲げ加工性に優れた冷延鋼板、その製造方法およびそれを用いた部材 - Google Patents
曲げ加工性に優れた冷延鋼板、その製造方法およびそれを用いた部材 Download PDFInfo
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- WO2010101074A1 WO2010101074A1 PCT/JP2010/053016 JP2010053016W WO2010101074A1 WO 2010101074 A1 WO2010101074 A1 WO 2010101074A1 JP 2010053016 W JP2010053016 W JP 2010053016W WO 2010101074 A1 WO2010101074 A1 WO 2010101074A1
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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
- 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
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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
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold 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
- C21D8/0426—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
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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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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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
- C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
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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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/003—Cementite
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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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
- 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
Definitions
- the present invention relates to a cold-rolled steel sheet for processing used in the fields of electrical machinery, building materials, automobiles, etc., in particular, a cold-rolled steel sheet excellent in bending workability, a manufacturing method thereof, and a member using the same.
- JIS G 3141 for members that are not subject to extremely strict drawing or overhanging, such as electrical equipment casings, construction scaffolding plates, cabinet side plates, and top plates, among members applied to electrical equipment, building materials, automobiles, etc.
- a cold-rolled steel sheet for general processing called SPCC is used. From the viewpoint of reducing the material cost, it is desired to reduce the thickness of the steel sheet used for the member. However, the decrease in the strength of the member becomes a problem as the thickness is reduced.
- the problem of member strength reduction is solved by using a high-strength steel sheet having a tensile strength TS of 390 MPa or more as shown in Non-Patent Document 1, but such a high-strength steel sheet contains an expensive element such as Mn. Since it is added, the manufacturing cost is high, and even if the gauge is reduced, the member cost is often not lowered.
- cold-rolled steel sheets used in electrical machinery, building materials, automobiles, etc. are manufactured by cold-rolling and then recrystallized annealing, but they are cheap and high-strength steel sheets, so-called full steel that omits annealing after cold-rolling.
- a cold-rolled steel sheet called a hard material is known.
- This full hard material has a rolled structure, uses work hardening by cold working, and is designed to increase strength without using expensive alloying elements. This is a preferable material.
- members used in the electric field may be used with screw pilot holes formed by burring and screwed. In the case where a full hard material is used for such a member, it is further required that the burring workability for a screw pilot hole is good and the screw breaking torque is high.
- Patent Documents 1 to 5 Conventionally, as a technique for improving the workability of a full hard material, as described in Patent Documents 1 to 5, C is reduced as much as possible, and Ti, Nb is added as necessary, or cold rolling is performed by ⁇ -range rolling. A method for softening a hot-rolled steel sheet before rolling is known. Further, Patent Document 6 discloses that during the flange processing after DI processing of an ultrathin steel plate having a thickness of 0.25 mm by controlling the contents of C, Mn, and Al and adding Nb to refine the crystal grain size to 8 ⁇ m or less. Techniques for improving the ductility of the are disclosed.
- Patent Document 7 discloses that mass% is C: more than 0.0040% and less than 0.08%, and P: less than 0.030%. Further, Ti is limited to less than 0.010% and Nb is less than 0.010%, and a steel having a component composition consisting of the balance Fe and inevitable impurities, the coiling temperature after hot rolling is 650 ⁇ 750 ° C., the average particle size before cold rolling is less than 30 ⁇ m, the method of manufacturing without passing through an annealing step after 70% or more cold rolling, or hot rolling at a finishing temperature less than the Ar 3 transformation temperature, There has been proposed a method of manufacturing without undergoing an annealing process after cold rolling of 70% or more.
- the present invention is inexpensive and can be subjected to severe 90-degree bending with a punch tip curvature of 2R or less even when the gauge is reduced, or has excellent screw pilot hole burring workability and can advantageously realize high screw breaking torque. It aims at providing the cold-rolled steel plate excellent in bending workability, its manufacturing method, and a member using the same.
- the component composition, particularly C It is necessary to optimize the amount and adjust the presence of precipitates in the hot-rolled steel sheet before cold rolling to obtain a cold-rolled steel sheet having a plate thickness direction ultimate deformability of 1.3 or more.
- the ultimate deformability in the plate thickness direction is the natural logarithm Ln (t of the ratio between the plate thickness t 0 before the test and the plate thickness t 1 of the fracture surface after the test when a tensile test of the steel plate is performed. 0 / t 1 ).
- the present invention has been made on the basis of such findings.
- C 0.025% or less
- Si 0.1% or less
- Mn 0.05 to 0.5%
- P 0.0. 03% or less
- S 0.02% or less
- sol. Al 0.01% to 0.1%
- the balance being a component composition composed of Fe and inevitable impurities, and a microstructure that is a ferrite rolled structure, a tensile strength TS of 390 MPa or more, and a sheet thickness of 0.
- the present invention is mass%, C: 0.025% or less, Si: 0.1% or less, Mn: 0.05 to 0.5%, P: 0.03% or less, S: 0.02 % Or less, sol. Al: 0.01 to 0.1% is included, the remainder has a composition composed of Fe and inevitable impurities, the tensile strength TS is 390 MPa or more, the yield ratio is 80% or more, the plate thickness is 0.4 mm or more, And the cold-rolled steel plate excellent in bending workability characterized by having a plate thickness direction ultimate deformability of 1.3 or more.
- the present invention is a cold-rolled steel sheet obtained by cold rolling a hot-rolled steel sheet, and in mass%, C: 0.025% or less, Si: 0.1% or less, Mn: 0.05 to 0 .5%, P: 0.03% or less, S: 0.02% or less, sol.
- a cold-rolled steel sheet excellent in bending workability characterized by having a tensile strength TS of 390 MPa or more, a plate thickness of 0.4 mm or more, and a plate thickness direction ultimate deformability of 1.3 or more.
- the average crystal grain size of the hot-rolled steel sheet is preferably 25 ⁇ m or less.
- the component composition is mass% and the C content is C: 0.0040% or less, or the component composition is further mass. %, Ti: 0.002 to 0.05%, Nb: One or two of 0.002 to 0.05%, or B: 0.0001 to 0.005% It is preferable.
- the cold-rolled steel sheet of the present invention preferably has a tensile strength TS of 490 MPa or more.
- Such a cold-rolled steel sheet of the present invention is preferably used as a member having a bent portion.
- the cold-rolled steel sheet excellent in bending workability of the present invention as described above is obtained by hot-rolling a steel having the above-described composition at a finishing temperature not lower than the Ar 3 transformation point, and a coiling temperature not lower than 500 ° C. and not higher than 650 ° C. After cold rolling and pickling, cold rolling is performed so that the rolling rate is in the range of 85% or less, and the steel sheet after cold rolling has a tensile strength TS of 390 MPa or more and a thickness of 0.4 mm or more. Can be manufactured. In the method for producing a cold-rolled steel sheet of the present invention, it is preferable to perform recovery annealing after cold rolling.
- the present invention it is possible to provide a steel plate that has a high tensile strength TS of 390 MPa or more and that can be subjected to severe 90-degree bending with a punch tip curvature of 2 R or less. Gaugeing is possible.
- the present invention has been cold-rolled with high strength without using expensive reinforcing elements, or has undergone recovery annealing By using the cold-rolled steel sheet, it was possible to significantly reduce the cost.
- this invention is applicable also to the member which has a screw pilot hole processed part by adjusting the tensile strength TS of a cold-rolled steel plate.
- the point of the present invention is to adjust the component composition and the presence state of precipitates in the hot-rolled steel sheet, further adjust the rolling rate of cold working to increase the strength, and make the plate thickness limit deformability 1.3 or more.
- Excellent bending that enables cold-rolled steel sheets that are cold-rolled or subjected to recovery annealing to achieve high strength with a tensile strength TS of 390 MPa or more and severe 90-degree bending with a punch tip curvature of 2R or less. It is in having made sex compatible.
- the screw pilot hole burring workability and the screw breaking torque are improved.
- Component composition C 0.025% or less
- the C content exceeds 0.025%, a large amount of coarse cementite precipitates during hot rolling, and the 90-degree bending workability with a punch tip curvature of 2R or less is significantly deteriorated. Therefore, the C content is 0.025% or less, more preferably 0.020% or less. In order to enable close contact bending, the C content is preferably 0.0040% or less. More preferably, it is 0.0030% or less. In addition, since it will lead to a cost increase if C amount is reduced too much, it is preferable to make C amount 0.0010% or more.
- the C content is too low, less than 0.0010%, the crystal grain size of the hot-rolled steel sheet tends to be coarsened, and the appearance of the processed part tends to deteriorate, and in particular, burring processing is performed to provide a screw pilot hole. When performed, burring workability tends to be reduced. Also from this viewpoint, the C content is preferably 0.0010% or more.
- Si 0.1% or less If Si is contained in a large amount exceeding 0.1%, the surface properties of the steel sheet are deteriorated, so the upper limit is made 0.1%. More preferably, it is 0.013% or less.
- Mn 0.05 to 0.5% Since Mn is an element that forms sulfides and improves hot brittleness, its amount is 0.05% or more. On the other hand, even if contained in a large amount, the effect tends to saturate, which leads to an increase in cost. Therefore, the upper limit is made 0.5%.
- P 0.03% or less P is segregated during casting of the slab and deteriorates mechanical properties. Therefore, the upper limit is made 0.03%.
- S 0.02% or less Since S is an element that lowers hot workability, the upper limit is made 0.02%. More preferably, it is 0.010% or less. On the other hand, if the amount of S is extremely low, the crystal grain size of the hot-rolled steel sheet tends to be coarsened, and particularly when performing burring of a screw pilot hole, the burring workability for the screw pilot hole may be deteriorated.
- the lower limit is preferably about 0.003%.
- sol. Al 0.01 to 0.1% Since Al has a deoxidizing action, sol.
- the amount of Al is 0.01% or more. From the viewpoint of cost reduction, the upper limit is made 0.1%.
- the balance other than the above elements is Fe and unavoidable impurities, but it may further contain one or two of Ti: 0.002 to 0.05% and Nb: 0.002 to 0.05%. it can.
- Ti and Nb have the effect of reducing the crystal grain size of the hot-rolled steel sheet and improving the appearance of the bent portion.
- C when C is 0.0040% or less, the crystal grain size of the hot-rolled steel sheet tends to be large, and the burring workability of the screw pilot hole may be deteriorated, so addition from this viewpoint is also preferable.
- B 0.0001 to 0.005% can be contained in order to improve the uniformity of the plate thickness after cold rolling and to improve the low temperature brittleness.
- Ti 0.002 to 0.05%
- Ti has the effect of refining the crystal grain size of the hot-rolled steel sheet. For this reason, it is preferable to add 0.002% or more.
- the crystal grain size of the hot-rolled steel sheet is large, roughening may occur in the bent portion and the appearance may be deteriorated. However, this can be improved by the refinement effect by Ti.
- burring workability tends to be reduced, and in particular, when C: 0.004% or less, it is likely to be a problem, but Ti addition This can improve the screw hole burring workability.
- the upper limit of Ti content is preferably 0.05%, more preferably 0.04% or less. is there.
- Nb 0.002 to 0.05% Nb also has the effect of refining the crystal grain size of the hot-rolled steel sheet and improving the appearance of the bent portion or the burring workability for a screw pilot hole, similarly to Ti. For this reason, containing 0.002% or more is preferable. On the other hand, if the content exceeds 0.05%, the effect is saturated and the cost is increased. Therefore, the upper limit of the Nb amount is preferably 0.05%, more preferably 0.04% or less. is there.
- B 0.0001 to 0.005% Since B has a stronger affinity for N than Al, it suppresses the formation of fine AlN that precipitates unevenly after hot rolling and causes variations in the strength in the longitudinal direction of the coil, and the thickness after cold rolling Reduce the variation of In particular, when C is not more than 0.004%, when Ti or Nb is added and solid solution C or solid solution N in the steel is fixed, grain boundary segregation occurs, and grain boundary strength. To improve low temperature brittleness. In order to obtain such an effect, the B content is preferably 0.0001% or more. On the other hand, when the amount of B exceeds 0.005%, the effect is saturated and the cost is increased. Therefore, the upper limit of the amount of B is preferably 0.005%, and more preferably 0.003%.
- the present invention is a high-strength cold-rolled steel sheet having a sheet thickness of 0.4 mm or more and a tensile strength TS of 390 MPa or more, which enables the thickness of the sheet to be reduced.
- the plate thickness needs to be 0.4 mm or more, more preferably 0.5 mm or more. It is.
- the upper limit of the plate thickness in the application in which the cold-rolled steel sheet of the present invention is used is about 3.2 mm, and the upper limit of the plate thickness is about 1.6 mm in the application for performing screw pilot hole machining.
- the tensile strength TS is required to be about 390 MPa or more as described above.
- the increase in strength is achieved by work hardening in cold rolling. That is, the hot-rolled steel sheet having the above-described component composition of the present invention is obtained by cold rolling.
- the hot-rolled steel sheet which is a rolled material having the above composition
- the cold-rolled steel sheet of the present invention has a ferrite rolled structure.
- the YR is about 80% or more, further about 90% or more, or about 95% or more.
- board thickness direction ultimate deformability shall be 1.3 or more. More preferably, it is 1.5 or more.
- the ultimate thickness direction deformability is determined as follows. That is, using a JIS No. 5 tensile test specimen collected along the rolling direction and the direction perpendicular to the rolling direction, a tensile test was performed by the method described in JIS Z 2241, and then the thickness of the fracture surface after the fracture was measured. The average sheet thickness direction ultimate deformability in the direction perpendicular to the rolling direction is obtained, and this average sheet thickness direction ultimate deformability is defined as the sheet thickness direction ultimate deformability.
- the amount of precipitation is preferably as small as possible. If the precipitation amount of cementite is less than 5.0 ⁇ 10 3 pieces / mm 2 , severe 90 ° bending with a punch tip curvature of 2R or less is possible. In order to enable close-contact bending, it is desirable that it is less than 2.3 ⁇ 10 3 pieces / mm 2 . In the case of C: 0.0040% or less, the amount of cementite deposited is small and less than 0.1 ⁇ 10 3 pieces / mm 2 .
- the ferrite average crystal grain size of the hot-rolled steel sheet which is a cold rolled material, is 25 ⁇ m or less.
- a threading process of a female screw is performed after burring the punched hole.
- the upper limit is preferably 25 ⁇ m.
- the ferrite average crystal grain size of the hot-rolled steel sheet is 15 ⁇ m or less. Excessive grain refinement is not preferable because it requires a special manufacturing method such as introduction of large strains during hot rolling, resulting in high costs.
- the average crystal grain size of the hot-rolled steel sheet is 8 ⁇ m or more, there is no problem in burring workability, and therefore it is preferably 8 ⁇ m or more. Furthermore, it is necessary to have excellent screw pilot hole strength so that the screw hole does not break at the time of threading. To that end, it is necessary to set the tensile strength TS of the cold-rolled steel sheet to 490 MPa or more and the screw breaking torque to 20 kgf ⁇ cm or more. is there. That is, in the present invention, in particular, the hot rolled steel sheet, which is a cold-rolled material, has a ferrite average crystal grain size of 25 ⁇ m or less and a tensile strength TS of 490 MPa or more. In addition, an excellent cold-rolled steel sheet can be obtained.
- the cold-rolled steel sheet of the present invention is obtained by rolling a steel having the above-described composition at a winding temperature of 500 ° C. or higher and lower than 650 ° C. after hot rolling at a finishing temperature not lower than the Ar 3 transformation point. Thereafter, the steel sheet can be manufactured by cold rolling so that the rolling rate is 85% or less, and the steel sheet after cold rolling has a tensile strength TS of 390 MPa or more and a plate thickness of 0.4 mm or more.
- TS tensile strength
- Finishing temperature during hot rolling Ar 3 transformation point or higher
- the finishing temperature is less than Ar 3 transformation point
- the average crystal grain size of hot-rolled steel sheet tends to be large and tends to be mixed, so the finishing temperature Is not less than the Ar 3 transformation point.
- it is 10% or more and less than 25% at the final rolling of finish rolling. It is preferable to introduce strain. This is because if the strain is less than 10%, the frequency of transformation nuclei decreases and the hot-rolled steel sheet tends to become coarse, and if it exceeds 25%, it becomes difficult to control the crown of the hot-rolled steel sheet, and the quality after cold rolling deteriorates. It is because it is easy to do.
- Winding temperature after hot rolling 500 ° C. or higher and 650 ° C. or lower
- the winding temperature is preferably 650 ° C. or lower. Is 600 ° C. or lower.
- the temperature is lower than 500 ° C., the precipitation amount of cementite increases, so the temperature is set to 500 ° C. or higher.
- the rolling rate in order to ensure TS ⁇ 390 MPa, is preferably 9% or more. Further, in order to obtain a good screw breaking torque with a tensile strength TS ⁇ 490 MPa, the rolling rate is preferably 30% or more.
- recovery annealing means annealing under conditions that can maintain TS ⁇ 390 MPa and YR ⁇ 80%, and the microstructure is substantially maintained as a ferrite rolling structure. That is, in this recovery annealing, the strain energy accumulated in the steel sheet by cold rolling is partly released by the thermal energy applied during annealing, but as the microstructure, the ferrite rolling structure is maintained for the most part,
- the area ratio of polygonal ferrite as recrystallized grains is about 10% or less.
- annealing is preferably performed at 500 ° C. for about 50 to 150 seconds, and when Ti or Nb is added, annealing is preferably performed at 600 ° C. for about 50 to 150 seconds.
- the cold-rolled steel sheet of the present invention can be plated with zinc, nickel, etc. for automobiles and home appliances. At this time, when plating is performed by a hot dipping method, the recovery annealing can also be performed by immersion in a plating bath or heat treatment after plating. Moreover, even if a chemical conversion film is applied or a laminated steel sheet is used, the effect of the present invention is not impaired.
- a sheet thickness cross section in the rolling direction was subjected to nital corrosion and a sheet thickness 1 ⁇ 4 position was observed at 200 times, and a photograph was taken, as described in JIS G 0552 (1998).
- the average crystal grain size was calculated by the cutting method.
- the amount of cementite deposited was measured by taking a photograph of a field of view of 0.21 ⁇ 0.16 mm at a thickness of 1/4 at 400 times by picral corrosion, counting the number of cementite in the observation field, and unit area The number of cementite per unit was evaluated.
- ⁇ indicates that no crack was observed
- ⁇ indicates that no crack was observed in the 90-degree V bending test
- ⁇ indicates that no crack was observed in the 90-degree V bending test.
- the observed material was evaluated as x, and the bending workability was evaluated. In the observation of the bent portion, the presence or absence of rough skin was also confirmed.
- the 60 ° conical punch was pushed up from the opposite side of the burr, and the hole diameter dmm when the crack penetrated the plate thickness was set.
- ⁇ is 50% or more
- ⁇ is 60% or more
- ⁇ is less than 50%
- burring process for a screw pilot hole. Sex was evaluated.
- JIS No. 5 tensile test specimens were taken along the rolling direction and the perpendicular direction of rolling, and subjected to a tensile test by the method described in JIS Z 2241. The average tensile strength TS and the average yield strength YS in the rolling direction and the perpendicular direction of rolling were measured.
- YS yield strength
- the thickness of the fracture surface after fracture was measured to determine the average thickness direction ultimate deformability in the rolling direction and the direction perpendicular to the rolling direction, and this was defined as the thickness direction ultimate deformability.
- burring with a ⁇ of 47% was performed to make a 2.5 mm screw pilot hole, and an M3 tapping screw was used to measure the torque at which the screw pilot hole breaks (screw breaking torque).
- the precipitation amount of cementite in the hot-rolled steel sheet is 5.0 ⁇ 10 3 pieces / mm 2 or more, and the ultimate deformability in the thickness direction of the cold-rolled steel sheet is less than 1.3, which is inferior in the C bending workability. .
- steel Nos. With low amounts of C and S are available. In Nos. 1 and 2, the crystal grain size of the hot-rolled steel sheet exceeds 25 ⁇ m, roughening is observed in the bent portion, and ⁇ is less than 50%, and the burring workability required for screw pilot hole machining is poor.
- the hot rolled steel sheet has a crystal grain size of 25 ⁇ m or less, rough surface is not required in the bent portion, ⁇ is 50% or more, and excellent burring workability required for screw pilot hole machining is excellent. .
- Example 1 7 Steel No. in Table 1 7 was used to produce a hot-rolled steel sheet under the same conditions as in Example 1. Next, after grinding the front and back of the hot-rolled steel sheet to various plate thicknesses, the rolling rate was changed in the range of 0 to 72% and cold-rolled to obtain a cold-rolled steel plate having a thickness of 0.8 mm. And for the hot rolled steel sheet and cold rolled steel sheet with a rolling rate of 0%, in the same manner as in Example 1, the average tensile strength TS, the yield ratio YR, the average sheet thickness direction ultimate deformability, the hole expansion ratio ⁇ , the screw fracture Torque was measured and bending workability was evaluated.
- the thickness direction cross section of the rolling direction was subjected to nital corrosion, and a photograph was taken by observing two views of the thickness 1/4 position at 200 times, from these two views.
- the bendability can be improved by performing annealing (recovery annealing) at 450 ° C. for 100 seconds so that TS ⁇ 390 MPa and YR ⁇ 80% can be maintained. Further, when annealing is performed at 700 ° C. for 100 seconds so that TS ⁇ 390 MPa and YR ⁇ 80%, the screw breaking torque is greatly reduced. It was confirmed that the area ratio of polygonal ferrite in the microstructure of the steel sheet after annealing at 450 ° C. for 100 seconds was 10% or less. Moreover, the area ratio of polygonal ferrite in the microstructure of the steel sheet after annealing at 700 ° C. for 100 seconds exceeded 10%.
- the area ratio of polygonal ferrite in the microstructure of the steel sheet after annealing at 600 ° C. for 100 seconds was confirmed to be 10% or less. Further, the area ratio of polygonal ferrite in the microstructure of the steel sheet after annealing at 800 ° C. for 100 seconds exceeded 10%.
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Abstract
Description
C:0.025%以下
C量が0.025%を超えると、熱間圧延時に粗大セメンタイトが多数析出し、ポンチ先端曲率が2R以下の90度曲げ加工性を著しく劣化させる。そのため、C量は0.025%以下とし、より好ましくは0.020%以下とする。密着曲げ加工を可能にするには、C量は0.0040%以下とすることが好ましい。より好ましくは0.0030%以下である。なお、C量を過度に低減すると、コストアップにつながるため、C量は0.0010%以上とすることが好ましい。また、C量が0.0010%未満と低くなりすぎると、熱延鋼板の結晶粒径が粗大化しやすく、加工部の外観が悪くなる傾向にあり、特にネジ下穴を設けるためにバーリング加工を行う場合、バーリング加工性が低下する傾向にある。この観点からも、C量は0.0010%以上とすることが好ましい。
Siは0.1%を超えて多量に含有すると、鋼板の表面性状を劣化させるため、その上限を0.1%とする。より好ましくは0.013%以下である。
Mnは硫化物を形成して熱間脆性を改善する元素であるため、その量は0.05%以上とする。一方、多量に含有してもその効果は飽和する傾向にあり、かえってコストアップにつながるため、その上限は0.5%とする。
Pはスラブの鋳造時に偏析して、機械特性を劣化させるため、その上限は0.03%とする。
Sは熱間での加工性を低下させる元素であるため、その上限は0.02%とする。より好ましくは0.010%以下である。一方、極端にS量が低いと、熱延鋼板の結晶粒径が粗大化しやすくなり、特にネジ下穴のバーリング加工を行う場合、ネジ下穴用バーリング加工性を劣化させる場合があるので、その下限を0.003%程度とすることが好ましい。
Alは脱酸作用があるため、sol.Al量は0.01%以上とする。また、低コスト化の観点から、その上限は0.1%とする。
Tiは熱延鋼板の結晶粒径を微細化する効果を有し、このため0.002%以上添加することが好ましい。上記したように、熱延鋼板の結晶粒径が大きい場合、曲げ加工部に肌荒れが生じ外観が悪くなることがあるが、Tiによる微細化効果により、これを改善することができる。さらに、ネジ下穴用バーリング加工を施す場合、熱延鋼板の結晶粒径が大きいと、バーリング加工性が低下する傾向にあり、特にC:0.004%以下の場合問題となりやすいが、Ti添加によりネジ下穴バーリング加工性も改善できる。一方、0.05%を超えて含有してもその効果は飽和し、かえってコスト高になるため、Ti量の上限は0.05%とすることが好ましく、より好ましくは0.04%以下である。
NbもTiと同様に熱延鋼板の結晶粒径を微細化し、曲げ加工部位の外観、あるいはさらにネジ下穴用バーリング加工性を改善する効果を有する。このため、0.002%以上の含有が好ましい。一方、0.05%を超えて含有してもその効果は飽和し、かえってコスト高になるため、Nb量の上限は0.05%とすることが好ましく、より好ましくは0.04%以下である。
Bは、Nとの親和力がAlより強いため、熱間圧延後に不均一に析出してコイル長手方向の強度のばらつきの原因となる微細なAlNの生成を抑制し、冷間圧延後の板厚のばらつきを小さくする。また、特にC:0.004%以下の場合に顕著であるが、TiやNbを添加して鋼中の固溶Cや固溶Nが固定された場合は、粒界偏析し、粒界強度を高めて低温脆性を改善する。こうした効果を得るにはB量を0.0001%以上にすることが好ましい。一方、B量が0.005%を超えるとその効果は飽和し、かえってコスト高になるため、B量の上限は0.005%とすることが好ましく、より好ましくは0.003%である。
本発明は、板厚の薄ゲージ化を可能とした、板厚0.4mm以上で、引張強度TSが390MPa以上の高強度冷延鋼板である。
ポンチ先端曲率が2R以下の厳しい90度曲げ加工性は、その変形領域が局所に限定されるため、通常の伸び特性では評価できないので、本発明では板厚方向極限変形能:Ln(試験前板厚/引張試験後の破面板厚)を導入している。この板厚方向極限変形能が1.3以上であればポンチ先端曲率が2R以下の90度曲げ加工が可能であり、最も厳しい90度曲げである0R(ポンチ先端曲率半径が0mm)での90度曲げ加工が可能である。さらにこの板厚方向極限変形能が1.5以上であれば密着曲げが可能となる。このため、本発明では、板厚方向極限変形能を1.3以上とする。より好ましくは1.5以上である。なお、本発明において、板厚方向極限変形能は次のようにして求める。すなわち、圧延方向および圧延直角方向に沿って採取したJIS 5号引張試験片を用い、JIS Z 2241に記載の方法で引張試験を行い、次いで、破断後の破断面の厚みを測定して、圧延方向および圧延直角方向の平均板厚方向極限変形能を求め、この平均板厚方向極限変形能を板厚方向極限変形能とする。
過度の細粒化は、熱間圧延時に大歪み導入などの特別な製造方法が必要となるため、高コストとなり好ましくない。熱延鋼板の平均結晶粒径が8μm以上であれば、バーリング加工性に問題がないため、8μm以上であることが好ましい。さらに、ネジ切り時にネジ穴が破壊しないようにネジ下穴強度に優れることが必要であるが、それには冷延鋼板の引張強度TSを490MPa以上としてネジ破壊トルクを20kgf・cm以上にする必要がある。すなわち、本発明においては、特に、冷間圧延素材である熱延鋼板のフェライト平均結晶粒径を25μm以下とし、引張強度TSを490MPa以上とすることで、曲げ加工性に優れ、さらにネジ破壊トルクにも優れた冷延鋼板とすることができる。
本発明の冷延鋼板は、上記の成分組成の鋼を、Ar3変態点以上の仕上温度で熱間圧延後、500℃以上650℃未満の巻取温度で巻取り、酸洗後、圧延率が85%以下の範囲で、かつ冷間圧延後の鋼板の引張強度TSが390MPa以上、板厚が0.4mm以上となるように冷間圧延を行うことによって製造できる。以下に、その限定理由を説明する。
仕上温度がAr3変態点未満となった場合には、熱延鋼板の平均結晶粒径が大きくなりやすく、また混粒となりやすいため、仕上温度はAr3変態点以上とする。本発明のようにC:0.025%以下と粒成長しやすい鋼を用いて熱延鋼板の結晶粒径を微細化するためには、仕上圧延の最終圧延時に、10%以上25%未満の歪みを導入することが好ましい。これは、歪みが10%未満では変態核の生成頻度が減少して熱延鋼板が粗粒になりやすく、25%以上では熱延鋼板のクラウン制御が困難となり、冷間圧延後の品質が低下しやすいためである。
巻取温度が650℃超えの場合には、熱延鋼板の結晶粒径が大きくなりやすいため、巻取温度は650℃以下、より好ましくは600℃以下とする。一方、500℃未満の場合は、セメンタイトの析出量が増えるため500℃以上とする。
熱延鋼板のスケールを除去するため、通常の条件で酸洗を行う。
冷間圧延時の圧下率である圧延率が85%を超えると、圧延直角方向の曲げ加工性が著しく低下し、ポンチ先端曲率が2R以下の90度曲げ加工が困難になる。したがって、圧延率が85%以下、より好ましくは75%以下とする。なお、圧延率は引張強度TS≧390MPaの所望のTSを得るように適宜定めればよい。本発明ではTS≧390MPaを確保する上では圧延率は9%以上とすることが好ましい。また、引張強度TS≧490MPaとしてネジ破壊トルクを良好とする上では、圧延率は30%以上とすることが好ましい。
Claims (14)
- 質量%で、C:0.025%以下、Si:0.1%以下、Mn:0.05~0.5%、P:0.03%以下、S:0.02%以下、sol.Al:0.01~0.1%を含み、残部がFeおよび不可避的不純物からなる成分組成と、フェライト圧延組織であるミクロ組織とを有し、引張強度TSが390MPa以上、板厚が0.4mm以上、かつ板厚方向極限変形能が1.3以上であることを特徴とする曲げ加工性に優れた冷延鋼板;
ここで、板厚方向極限変形能とは、鋼板の引張試験を行ったとき、試験前の鋼板板厚t0と試験後の鋼板破断面の板厚t1との比の自然対数Ln(t0/t1)のことである。 - 質量%で、C:0.025%以下、Si:0.1%以下、Mn:0.05~0.5%、P:0.03%以下、S:0.02%以下、sol.Al:0.01~0.1%を含み、残部がFeおよび不可避的不純物からなる成分組成を有し、引張強度TSが390MPa以上、降伏比が80%以上、板厚が0.4mm以上、かつ板厚方向極限変形能が1.3以上であることを特徴とする曲げ加工性に優れた冷延鋼板;
ここで、板厚方向極限変形能とは、鋼板の引張試験を行ったとき、試験前の鋼板板厚t0と試験後の鋼板破断面の板厚t1との比の自然対数Ln(t0/t1)のことである。 - 熱延鋼板を冷間圧延してなる冷延鋼板であって、質量%で、C:0.025%以下、Si:0.1%以下、Mn:0.05~0.5%、P:0.03%以下、S:0.02%以下、sol.Al:0.01~0.1%を含み、残部がFeおよび不可避的不純物からなる成分組成を有し、前記熱延鋼板においてセメンタイトの析出量が5.0×103個/mm2未満であり、引張強度TSが390MPa以上、板厚が0.4mm以上、かつ板厚方向極限変形能が1.3以上であることを特徴とする曲げ加工性に優れた冷延鋼板;
ここで、板厚方向極限変形能とは、鋼板の引張試験を行ったとき、試験前の鋼板板厚t0と試験後の鋼板破断面の板厚t1との比の自然対数Ln(t0/t1)のことである。 - 前記熱延鋼板の平均結晶粒径が25μm以下であることを特徴とする請求項3に記載の曲げ加工性に優れた冷延鋼板。
- 前記成分組成において、C含有量が、質量%で、C:0.0040%以下であることを特徴とする請求項1ないし4に記載の曲げ加工性に優れた冷延鋼板。
- 前記成分組成が、さらに、質量%で、Ti:0.002~0.05%、Nb:0.002~0.05%の1種または2種を含有することを特徴とする請求項1ないし5に記載の曲げ加工性に優れた冷延鋼板。
- 前記成分組成が、さらに、質量%で、B:0.0001~0.005%を含有することを特徴とする請求項1ないし6に記載の曲げ加工性に優れた冷延鋼板。
- 引張強度TSが490MPa以上であることを特徴とする請求項1ないし7に記載の曲げ加工性に優れた冷延鋼板。
- 請求項1ないし8に記載の冷延鋼板を用い、曲げ加工部を有することを特徴とする部材。
- 質量%で、C:0.025%以下、Si:0.1%以下、Mn:0.05~0.5%、P:0.03%以下、S:0.02%以下、sol.Al:0.01~0.1%を含み、残部がFeおよび不可避的不純物からなる成分組成を有する鋼を、Ar3変態点以上の仕上温度で熱間圧延後、500℃以上650℃以下の巻取温度で巻取り、
酸洗後、圧延率が85%以下の範囲で、かつ冷間圧延後の鋼板の引張強度TSが390MPa以上、板厚が0.4mm以上となるように冷間圧延を行うことを特徴とする曲げ加工性に優れた冷延鋼板の製造方法。 - 前記成分組成において、C含有量が、質量%で、C:0.0040%以下であることを特徴とする請求項10に記載の曲げ加工性に優れた冷延鋼板の製造方法。
- 前記成分組成が、さらに、質量%で、Ti:0.002~0.05%、Nb:0.002~0.05%の1種または2種を含有することを特徴とする請求項10または11に記載の曲げ加工性に優れた冷延鋼板の製造方法。
- 前記成分組成が、さらに、質量%で、B:0.0001~0.005%を含有することを特徴とする請求項10ないし12に記載の曲げ加工性に優れた冷延鋼板の製造方法。
- 冷間圧延後、さらに、回復焼鈍を行うことを特徴とする請求項10ないし13に記載の曲げ加工性に優れた冷延鋼板の製造方法。
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- 2009-12-22 JP JP2009290244A patent/JP5655300B2/ja active Active
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2010
- 2010-02-19 KR KR1020117019568A patent/KR101431316B1/ko active IP Right Grant
- 2010-02-19 ES ES10748669T patent/ES2704707T3/es active Active
- 2010-02-19 WO PCT/JP2010/053016 patent/WO2010101074A1/ja active Application Filing
- 2010-02-19 MY MYPI2011003360A patent/MY161077A/en unknown
- 2010-02-19 PL PL10748669T patent/PL2405026T3/pl unknown
- 2010-02-19 CN CN201080010706.6A patent/CN102341519B/zh not_active Expired - Fee Related
- 2010-02-19 KR KR1020137022206A patent/KR101612593B1/ko active IP Right Grant
- 2010-02-19 EP EP10748669.8A patent/EP2405026B1/en active Active
- 2010-02-19 US US13/254,050 patent/US20110318217A1/en not_active Abandoned
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See also references of EP2405026A4 |
Also Published As
Publication number | Publication date |
---|---|
MY161077A (en) | 2017-04-14 |
KR20130101588A (ko) | 2013-09-13 |
KR101431316B1 (ko) | 2014-08-20 |
CN102341519A (zh) | 2012-02-01 |
CN102341519B (zh) | 2015-02-18 |
KR20110105403A (ko) | 2011-09-26 |
EP2405026B1 (en) | 2018-11-28 |
EP2405026A1 (en) | 2012-01-11 |
JP2010229545A (ja) | 2010-10-14 |
JP5655300B2 (ja) | 2015-01-21 |
EP2405026A4 (en) | 2014-04-23 |
KR101612593B1 (ko) | 2016-04-15 |
ES2704707T3 (es) | 2019-03-19 |
PL2405026T3 (pl) | 2019-06-28 |
US20110318217A1 (en) | 2011-12-29 |
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