WO2011126154A1 - 温間加工性に優れた高強度鋼板およびその製造方法 - Google Patents
温間加工性に優れた高強度鋼板およびその製造方法 Download PDFInfo
- Publication number
- WO2011126154A1 WO2011126154A1 PCT/JP2011/059459 JP2011059459W WO2011126154A1 WO 2011126154 A1 WO2011126154 A1 WO 2011126154A1 JP 2011059459 W JP2011059459 W JP 2011059459W WO 2011126154 A1 WO2011126154 A1 WO 2011126154A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- less
- steel sheet
- temperature
- strength
- elongation
- Prior art date
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 122
- 239000010959 steel Substances 0.000 title claims abstract description 122
- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000005098 hot rolling Methods 0.000 title claims abstract description 18
- 230000008569 process Effects 0.000 title claims abstract description 10
- 238000004519 manufacturing process Methods 0.000 title claims description 14
- 238000010438 heat treatment Methods 0.000 claims abstract description 45
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 25
- 239000000956 alloy Substances 0.000 claims abstract description 25
- 239000011159 matrix material Substances 0.000 claims abstract description 19
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 19
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 17
- 239000000463 material Substances 0.000 claims abstract description 16
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 14
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 13
- 229910052796 boron Inorganic materials 0.000 claims abstract description 12
- 239000000203 mixture Substances 0.000 claims abstract description 12
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 12
- 229910052721 tungsten Inorganic materials 0.000 claims abstract description 11
- 238000005096 rolling process Methods 0.000 claims abstract description 10
- 238000004804 winding Methods 0.000 claims abstract description 10
- 229910001566 austenite Inorganic materials 0.000 claims abstract description 8
- 238000009864 tensile test Methods 0.000 claims description 23
- 238000005246 galvanizing Methods 0.000 claims description 9
- 238000007747 plating Methods 0.000 claims description 9
- 229910052698 phosphorus Inorganic materials 0.000 claims description 8
- 229910052710 silicon Inorganic materials 0.000 claims description 8
- 239000012535 impurity Substances 0.000 claims description 7
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- 238000005275 alloying Methods 0.000 claims description 4
- 239000000126 substance Substances 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 15
- 150000001247 metal acetylides Chemical class 0.000 description 14
- 238000000465 moulding Methods 0.000 description 13
- 238000001816 cooling Methods 0.000 description 11
- 230000000694 effects Effects 0.000 description 11
- 238000001556 precipitation Methods 0.000 description 11
- 239000002244 precipitate Substances 0.000 description 8
- 229910000734 martensite Inorganic materials 0.000 description 7
- 230000009466 transformation Effects 0.000 description 7
- 230000007423 decrease Effects 0.000 description 6
- 238000010791 quenching Methods 0.000 description 6
- 238000005728 strengthening Methods 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 5
- 239000013078 crystal Substances 0.000 description 5
- 239000006185 dispersion Substances 0.000 description 5
- 229910052748 manganese Inorganic materials 0.000 description 5
- 229910052757 nitrogen Inorganic materials 0.000 description 5
- 239000000047 product Substances 0.000 description 4
- 230000002411 adverse Effects 0.000 description 3
- 229910052804 chromium Inorganic materials 0.000 description 3
- 239000006104 solid solution Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000009749 continuous casting Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000005554 pickling Methods 0.000 description 2
- 229910052718 tin Inorganic materials 0.000 description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 229910011214 Ti—Mo Inorganic materials 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- 229910001563 bainite Inorganic materials 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000005539 carbonized material Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000005501 phase interface Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
- B32B15/013—Layered products comprising a layer of metal all layers being exclusively metallic one layer being formed of an iron alloy or steel, another layer being formed of a metal other than iron or aluminium
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/62—Quenching devices
- C21D1/673—Quenching devices for die quenching
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
-
- 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
-
- 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
- C21D8/0431—Warm 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
- C21D8/0463—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 following hot rolling
-
- 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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
- C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
- C23C2/0224—Two or more thermal pretreatments
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
- C23C2/024—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by cleaning or etching
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/26—After-treatment
- C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
Definitions
- the present invention relates to a high-strength steel sheet suitable for use in transportation equipment, construction equipment, and the like, and particularly relates to improvement of warm workability for automobile parts, and more particularly to improvement of warm press formability.
- “high strength” refers to a case where the tensile strength TS is 590 MPa or higher, preferably 780 MPa or higher.
- Patent Document 1 discloses, in weight%, C: 0.1 %, Mo: 0.05 to 0.6%, Ti: 0.02 to 0.10%, and substantially within the ferrite structure, Ti / Mo: 0.1 or more in atomic ratio
- a high formability, high-tensile hot-rolled steel sheet with excellent material uniformity formed by dispersion and precipitation of carbide containing Mo and Mo has been proposed.
- the hot-rolled steel sheet described in Patent Document 1 is preferably C: 0.06% or less, Si: 0.3% or less, Mn: 1 to 2%, P: 0.06% or less, S: 0.005 %: Al: 0.06% or less, N: 0.006% or less, Cr: 0.04-0.5%, Mo: 0.05-0.5%, Ti: 0.02-0.10 %, Nb: 0.08% or less, and a composition containing Ti / Mo at an atomic ratio of 0.1 or more is heated to an austenite single-phase temperature and then finish-rolled at 880 ° C. or more. Is completed, and it can be manufactured by a manufacturing method of winding at 550 to 700 ° C.
- This high-strength steel sheet has a high strength of tensile strength TS: 590 MPa or more, but has high formability, and can be used for press forming of members with particularly complicated cross-sectional shapes during cold press forming. It is said that.
- a die quench method has been proposed as one method for solving the problems in cold press forming of high-strength steel sheets.
- This die quench method is a forming method in which a steel plate as a workpiece is heated to an austenite temperature range of, for example, 900 ° C. or higher, and then press-molded into a desired part shape using a press die.
- the steel plate (component) can be rapidly cooled with a mold.
- it can be formed into a desired part shape, and the structure can be made a martensite-based structure by rapid cooling with a mold, so that a high-strength part can be easily manufactured with high shape accuracy.
- Patent Document 2 discloses a method for obtaining a high-strength press part by utilizing such warm press molding at a higher temperature than conventionally performed.
- a steel sheet is heated to a temperature of 200 to 850 ° C., and then subjected to warm forming that imparts a plastic strain of 2% or more to a portion requiring strength. Is the method.
- the steel plate used by the technique described in patent document 2 is the mass%, C: 0.01-0.20%, Si: 0.01-3.0%, Mn: 0.01-3.
- JP 2002-322541 A Japanese Patent No. 3962186
- a conventional high-strength steel sheet of various transformation structure strengthening type with a low-temperature transformation product such as martensite as a strengthening factor is heated to a temperature of over 200 ° C to about 850 ° C and press-molded.
- the steel sheet strength is reduced because it is heated to a temperature higher than the temperature at the time of manufacture, and press forming becomes easy.
- the strengthening structure factor such as martensite decomposes during heating, There is a problem that the desired high strength cannot be maintained when cooled.
- the overhang forming portion is likely to be broken.
- the present invention solves such problems of the prior art, is excellent in warm workability, can be applied to a warm press method of heating to a temperature of over 200 ° C. to about 850 ° C. and press-molding at that temperature, In addition, it is possible to produce a desired high-strength part without requiring long-time holding in the mold at the time of processing and regardless of the amount of warm processing.
- Tensile strength TS 590 MPa or more, preferably 780 MPa or more It aims at providing the high strength steel plate which comprises high strength, and its manufacturing method.
- the present inventors have intensively studied the deformation behavior of a steel sheet during warm press forming.
- the temperature of the steel sheet which is a material to be molded, first comes into contact with the mold (punch), and the temperature rapidly decreases due to contact with the mold (punch), and the temperature is relatively low (400
- uniform elongation is high at a low temperature of less than 400 ° C.
- tensile elongation is high at a high temperature of 400 ° C. or higher
- the tensile strength at room temperature after warm press forming concludes that if it is a material (steel plate) having a high strength of 590 MPa or more, preferably 780 MPa or more, it is possible to manufacture a high-strength automotive part having a complicated shape by applying warm press molding. Reached.
- a steel sheet having the following tensile properties is preferable as a steel sheet suitable for warm press forming.
- Steel sheet suitable for warm press forming is uniformly stretched at a relatively low temperature (less than 400 ° C) corresponding to the part subjected to overhang forming at a relatively low temperature (less than 400 ° C). Then, the amount of deformation until the maximum load is shown) is large, and it does not come into contact with the mold and corresponds to the part subjected to stretch flange molding at a high temperature (400 ° C. or higher), at a high temperature (400 ° C. or higher).
- the present inventors have newly found that the steel sheet has a tensile property that combines a large local elongation (here, the amount of deformation from the highest load to the fracture).
- the steel sheet having the tensile properties as described above is a matrix that is substantially a ferrite phase, that is, a ferrite fraction of 95% or more, preferably 98% or more.
- the precipitate that is dispersed and precipitated in the “state without variant selection” is a state in which the crystal orientation of the precipitate is not constant with respect to the parent phase and all variants that can be precipitated are selected.
- the “state with variant selection” refers to a case where the crystal orientation of the precipitate is aligned in one direction with respect to the parent phase, for example, phase interface precipitation.
- a steel sheet (hot rolled steel sheet) having the above-described structure is wound after the predetermined hot rolling is completed at a coiling temperature of less than 600 ° C., and then 650 It was found that it can be obtained by heat treatment in a temperature range of ⁇ 750 ° C.
- the present invention has been completed based on such findings and further studies. That is, the gist of the present invention is as follows.
- Tensile strength a high strength steel sheet having a high strength of 590 MPa or higher
- a test temperature obtained by a tensile test conducted at 400 ° C. The amount of deformation from the start of tension to the point before the maximum load is obtained, which is greater than the amount of deformation from the start of tension to the point before the maximum load is obtained and the test temperature is less than 400 ° C.
- the high-strength steel sheet is, in mass%, C: 0.01 to 0.2%, Si: 0.5% or less, Mn: 2% or less, P: 0.03% or less. , S: 0.01% or less, Al: 0.07% or less, N: 0.01% or less, Ti: 0.005-0.3%, Nb: 0.005-0.6% , V: 0.005 to 1.0%, Mo: 0.005 ⁇ 0.5%, W: 0.01 ⁇ 1.0%, B: contain one or more selected from 0.0005 ⁇ 0.0040%, from the remainder Fe and inevitable impurities
- a high-strength steel sheet characterized by having a composition as follows.
- a heat treatment step at a temperature range heat treatment characterized in that sequentially applied, tensile strength: have more than 590 MPa, the method of producing a high strength steel sheet excellent in warm workability.
- a high-strength steel sheet excellent in warm workability can be manufactured easily and inexpensively, and an industrially remarkable effect is achieved.
- there is an effect that high-strength parts for automobiles having desired high strength and desired shape accuracy can be easily and inexpensively manufactured by applying warm press molding.
- the steel sheet of the present invention is a steel sheet having a high tensile strength of 590 MPa or more and having tensile properties suitable for warm press forming, in particular, elongation properties consistent with warm press forming.
- the steel sheet of the present invention has a tensile property that the uniform elongation is larger than the local elongation, that is, the elongation property that the uniform elongation is 40% or more in terms of the total elongation.
- the test temperature is a high temperature of 400 ° C.
- the local elongation is larger than the uniform elongation, that is, the ratio of the local elongation to the uniform elongation has an elongation property exceeding 1.0.
- the part where stretch flange molding is performed maintains a high temperature state of the steel sheet without touching the mold, so that when the local elongation at high temperature is higher than the uniform elongation, the stretch flange can be formed better.
- Combining the elongation characteristics in this facilitates forming into a complex desired shape part by warm press forming.
- a steel plate that cannot satisfy either of the low temperature and high temperature elongation characteristics cannot produce a part having a desired complex shape by warm press forming.
- uniform elongation refers to the amount of deformation from the start of tension to the maximum load (ratio to the distance between gauge points) obtained from the load-elongation curve obtained in the tensile test, regardless of the test temperature.
- local elongation means the amount of deformation from the maximum load to the fracture (ratio to the distance between the gauge points) obtained from the load-elongation curve obtained in the tensile test regardless of the test temperature.
- total elongation refers to the total deformation amount (ratio to the distance between gauge points) from the start of tension to fracture, which is the so-called total elongation obtained from a load-elongation curve obtained in a tensile test. .
- test temperature is lower than 400 ° C.” means that the test temperature is 300 ° C.
- test temperature is higher than 400 ° C.” means that the test temperature is 500 ° C. It may represent tensile properties.
- the elongation characteristic in the case of test temperature: less than 400 degreeC is the test temperature of less than 400 degreeC which extract
- a tensile test is performed at (for example, 300 ° C.) in accordance with JIS G 0567, and the total elongation, local elongation and uniform elongation are obtained from the obtained load-elongation curve.
- the tensile speed is 10 mm / min.
- the elongation characteristics when the test temperature is 400 ° C. or higher were obtained by taking a type I test piece (parallel part width: 10 mm, GL: 50 mm) defined in JIS G 0567 from a steel sheet, and a test temperature of 400 ° C. or higher. (For example, 500 ° C.), in accordance with JIS G 0567, a tensile rate: 10 mm / min, and a high-temperature tensile test is performed. From the obtained load-elongation curve, total elongation, uniform elongation, local elongation The elongation shall be calculated.
- the structure (matrix) is substantially a single phase of ferrite phase.
- the term “substantially a ferrite phase single phase” as used herein allows a case where the second phase includes an area ratio of up to 5%. That is, it means that the ferrite phase is 95% or more in terms of the area ratio with respect to the entire structure. If the second phase is up to 5%, a significant decrease in strength due to heating to a warm press molding temperature is not observed, and the effects of the invention can be exhibited.
- the second phase is preferably 2% or less.
- the steel sheet of the present invention has a structure in which alloy carbide having a size of less than 10 nm is dispersed and precipitated in the above-described matrix.
- the size of the alloy carbide precipitated in the matrix is increased to 10 nm or more, the carbide is coarsened, the strength is lowered, the local portion is reduced, and the warm workability is lowered.
- the number of dispersed alloy carbides having a size of less than 10 nm is preferably 5 ⁇ 10 11 pieces / mm 3 or more.
- the alloy carbide referred to here is a carbide such as Ti, Nb, or V. Note that these may be combined.
- alloy carbide having a size of less than 10 nm that is dispersed and precipitated in the matrix is dispersed and precipitated in a state where no variant is selected.
- state without variant selection refers to the case where the relationship between the crystal orientation of the parent phase and the crystal orientation of the alloy carbide is not constant, and there is no single orientation that can be precipitated.
- the steel sheet of the present invention is preferably in mass%, C: 0.01 to 0.2%, Si: 0.5% or less, Mn: 2% or less, P: 0.03% or less, S: 0.01 %: Al: 0.07% or less, N: 0.01% or less, Ti: 0.005-0.3%, Nb: 0.005-0.6%, V: 0.005 ⁇ 1.0%, Mo: 0.005-0.5%, W: 0.01-1.0%, B: One or more selected from 0.0005-0.0040% And has a composition composed of the balance Fe and inevitable impurities.
- mass% is simply referred to as%.
- C 0.01 to 0.2%
- C is the most important element that forms carbides and increases the strength of the steel sheet.
- C precipitates as fine carbides in the matrix during the process before the hot press forming process, particularly the heat treatment after hot rolling, and contributes to the enhancement of the strength of the part.
- it is preferable to contain 0.01% or more.
- the content exceeds 0.2%, it becomes difficult to make the matrix substantially a ferrite single phase, and the ductility is significantly lowered.
- C is preferably limited to a range of 0.01 to 0.2%. In addition, More preferably, it is 0.18% or less. Further, the amount of C can be roughly defined by a desired strength level.
- C is preferably 0.01% or more and 0.03% or less
- C is more than 0.03% to 0%. 0.06% or less
- C is preferably more than 0.06% to 0.09% or less
- C is preferably more than 0.09% to 0.2% or less.
- Si 0.5% or less
- Si is an element that enhances temper softening resistance. Therefore, Si is actively added. In the present invention, however, in order to promote the degradation of surface properties and the variant-selected precipitation of alloy carbides. It is desirable to reduce as much as possible.
- Si increases deformation resistance in the warm state, it inhibits the increase in elongation. For this reason, Si is preferably limited to 0.5% or less in the present invention. In addition, More preferably, it is 0.3% or less, More preferably, it is 0.1% or less.
- Mn 2% or less Mn is an element having a function of increasing the strength of a steel sheet by solid solution. In order to obtain such an effect, 0.1% or more is desirable, but it exceeds 2%. When contained, segregation becomes remarkable and hardenability increases, making it difficult to make the structure a single phase of ferrite. For this reason, it is preferable to limit Mn to 2% or less. More preferably, the content is 0.1 to 1.6%.
- P 0.03% or less
- P is an element that effectively contributes to an increase in the strength of the steel sheet by solid solution strengthening, but is easily segregated at the grain boundaries and causes remarkable cracks during processing. For this reason, in the present invention, it is desirable to reduce as much as possible, but if it is reduced to about 0.03% or less, such adverse effects are reduced to an acceptable level. Therefore, P is preferably 0.03% or less. In addition, More preferably, it is 0.02% or less.
- S 0.01% or less S forms MnS, promotes the generation of voids during molding, and decreases warm workability. For this reason, it is desirable to reduce S as much as possible. If it is reduced to about 0.01% or less, such adverse effects can be reduced to an acceptable level. For this reason, it is preferable to limit S to 0.01% or less. In addition, More preferably, it is 0.002% or less.
- Al 0.07% or less
- Al is an element that acts as a deoxidizer, and in order to obtain such an effect, it is desirable to contain 0.01% or more, but the content exceeding 0.07% Oxide inclusions are likely to increase, reducing the cleanliness of the steel and lowering the warm workability. For this reason, Al is preferably limited to 0.07% or less. More preferably, it is 0.03 to 0.06%.
- N 0.01% or less N is an element having an adverse effect of lowering local elongation due to coarse precipitation of TiN, and is desirably reduced as much as possible in the present invention. If the content exceeds 0.01%, coarse nitrides are formed and formability is lowered. For this reason, it is preferable to limit N to 0.01% or less. In addition, More preferably, it is 0.005% or less.
- carbonized_material (alloy carbide) the combination of Ti-Mo, Nb-Mo, Ti-Nb-Mo, Ti-W, Ti-Nb-Mo-W is more preferable.
- V and Ti are contained together, the fine carbide targeted by the present invention can be easily obtained by setting V / Ti to 1.75 or less by mass ratio.
- the balance other than the components described above consists of Fe and inevitable impurities.
- Inevitable impurities include, for example, Cu: 0.1% or less, Ni: 0.1% or less, Sn: 0.1% or less, Mg: 0.01% or less, Sb: 0.01% or less, Co: 0.01% or less is allowed.
- the preferable manufacturing method of this invention steel plate is demonstrated.
- a steel material having the above composition is used as a starting material.
- the manufacturing method of a steel raw material does not need to be specifically limited in the present invention, and any generally known manufacturing method can be applied.
- the present invention is not limited to this.
- steel materials such as slabs are not cooled to room temperature, inserted into a heating furnace and hot-rolled. Absent.
- the steel material is preferably heated to an austenite single-phase temperature range of 1150 ° C. or higher in order to sufficiently re-dissolve alloy carbides and the like in the steel material.
- the heating temperature is less than 1150 ° C., the deformation resistance is too high, the load on the hot rolling mill is increased, and hot rolling may be difficult.
- the heating temperature may be 1300 ° C. or less. preferable. For this reason, the heating temperature of the steel material is preferably 1150 to 1300 ° C.
- the steel material heated to the austenite single-phase temperature range is then subjected to a hot rolling process.
- the steel material is hot-rolled at a rolling end temperature of 850 ° C. or higher to form a hot-rolled sheet, which is wound at a winding temperature of 400 ° C. or higher and lower than 600 ° C.
- rolling end temperature is less than 850 ° C.
- the surface layer structure becomes coarse and the warm workability is lowered.
- rolling completion temperature shall be 850 degreeC or more.
- the temperature is more preferably 880 to 940 ° C.
- winding is performed at a winding temperature of 400 ° C. or higher and lower than 600 ° C.
- the coiling temperature is less than 400 ° C.
- a martensite phase is generated, and a structure of a single ferrite phase cannot be obtained.
- alloy carbides are likely to be coarsened and fine carbides are difficult to obtain.
- the coiling temperature is 600 ° C. or higher, alloy carbide selected as a variant is generated in the steel sheet, and the desired warm workability cannot be ensured.
- it is less than 550 degreeC, More preferably, it is 530 degrees C or less.
- the hot rolling conditions are within the scope of the present invention, fine (less than 10 nm) alloy carbides are hardly precipitated after the hot rolling step, and dispersion precipitation in the absence of the selection of a variant is not recognized. .
- the surface scale of the hot rolled sheet is removed by pickling or the like.
- a heat treatment step is performed.
- a heat treatment is performed at a heating temperature of 650 to 750 ° C., and preferably for a holding time of 10 to 300 s, followed by cooling.
- the cooling is not particularly limited but is preferably air cooling or standing cooling.
- a desired alloy carbide is precipitated by heat treatment at 650 to 750 ° C.
- the heat treatment described above can be replaced by a heat treatment at the time of warm press forming if the heating temperatures overlap.
- alloy carbides of less than 10 nm are not precipitated after the forming process, but are already precipitated before the forming process during the warm press forming.
- the steel plate which performed the heat treatment process is good also as a plated steel plate by performing the plating process which makes a plating layer adhere to the surface further. Examples of the plating layer include a hot dip galvanized layer, an electrogalvanized layer, and a hot dip aluminum plated layer.
- a hot dip galvanized layer on the surface of a hot-rolled sheet for example, preferably after performing the above-described heat treatment step using a continuous hot dip galvanizing line, to a predetermined temperature of about 500 ° C. or less.
- a hot dip galvanizing treatment may be performed by cooling and subsequently immersing in a hot dip galvanizing bath maintained at a predetermined temperature of about 470 ° C. to form a hot dip galvanized layer on the surface of the steel sheet.
- a regular plating line other than the continuous hot dip galvanizing line is used.
- a steel material (slab) having the composition shown in Table 1 is subjected to a hot rolling process to obtain a hot rolled sheet having a thickness of 1.6 mm at the heating temperature, finish rolling finishing temperature, and winding temperature under the conditions shown in Table 2. Then, after pickling to remove the scale on the surface of the hot-rolled sheet, a heat treatment step was performed in which heat treatment under the conditions shown in Table 2 was carried out under the heating temperature, holding time, and cooling conditions. In some hot-rolled sheets, a hot dip galvanizing treatment is performed by cooling to the cooling stop temperature shown in Table 2 without cooling to the room temperature in the above heat treatment step, and subsequently immersing in a hot dip galvanizing bath at a liquid temperature of 470 ° C.
- the plating adhesion amount was 45 g / m 2 .
- Test pieces were collected from the obtained hot-rolled plate or plated plate and subjected to structure observation and tensile test.
- the test method is as follows.
- (1) Microstructure observation A specimen for microstructural observation is collected from the obtained steel sheet, and the cross section (L cross section) parallel to the rolling direction is polished, subjected to Nital corrosion, and optical microscope (magnification: 400 times) and scanning type. The tissue was observed and imaged with an electron microscope (magnification: 5000 times), and the type identification and the tissue fraction of each phase were measured using an image analyzer.
- EDX energy dispersive X-ray spectrometer
- a type I test piece (parallel part width: 10 mm, GL: 50 mm) defined in JIS G 0567 was collected, and JIS G 0567 was tested at a test temperature (500 ° C.) of 400 ° C. or higher.
- a high temperature tensile test was performed in accordance with the regulations. From the obtained load-elongation curve, the amount of deformation from the start of tension to the point before showing the maximum load as uniform elongation, and the amount of deformation until the break after showing the maximum load as the local elongation are obtained. Elongation was calculated.
- the test temperature was a value measured with a thermocouple attached to the center of the parallel part of the test piece, and the tensile speed was 10 mm / min.
- the uniform elongation / total elongation is 40% or more
- the tensile test conducted at a test temperature of 400 ° C. or more 500 ° C.
- the case where the local elongation / uniform elongation was over 1.0 was evaluated as being excellent in warm press formability as ⁇ . In other cases, it was evaluated that the warm press formability was poor as x.
- a tensile test piece was collected from the obtained steel plate, heated at 700 ° C., held for 3 min, and then air-cooled without processing to simulate the heat history of warm press forming. The tensile test was carried out at room temperature, the tensile strength TS was measured, and the change in strength due to warm press molding heating was observed.
- Each of the inventive examples has a high strength of 590 MPa or more, and is a tensile test conducted at a test temperature of less than 400 ° C. (300 ° C.), and (uniform elongation) / (total elongation) is 40% or more.
- (local elongation) / (uniform elongation) is more than 1.0, excellent in warm press formability, and at the time of warm press forming No significant change in strength is observed by heating.
- a comparative example out of the scope of the present invention is a tensile test conducted at a test temperature of less than 400 ° C. (300 ° C.), where (uniform elongation) / (total elongation) is less than 40% or 400 ° C.
- a test temperature of less than 400 ° C. (300 ° C.)
- (uniform elongation) / (total elongation) is less than 40% or 400 ° C.
- the tensile test conducted at the above test temperature (500 ° C.) whether (local elongation) / (uniform elongation) is 1.0 or less, the warm press formability is lowered, or the warm press The tensile strength is greatly reduced by heating during molding.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
Description
高強度鋼板としては、フェライトに、例えばマルテンサイト等の低温変態生成物を適正量、複合させて高強度化を図る、各種の変態組織強化型の高強度鋼板が提案されている。しかし、一般に、このような高強度鋼板は、軟鋼や低強度の鋼板と比べて、塑性変形が抑制され延性(伸び)が低下しており、冷間で、複雑な形状へのプレス成形を行うと、割れ等が生じる危険性が高く、プレス成形が難しいという問題がある。またさらに、このような高強度鋼板は、高強度であるため、冷間でのプレス成形においては、スプリングバックによる成形品の形状精度が低下するという問題もある。
%以下、Mo:0.05~0.6%、Ti:0.02~0.10%を含み、実質的にフェライト組織に、原子比でTi/Mo:0.1以上を満たす範囲でTiおよびMoを含む炭化物が分散析出してなる材質均一性に優れた高成形性高張力熱延鋼板が提案されている。特許文献1に記載された熱延鋼板は、好ましくはC:0.06%以下、Si:0.3%以下、Mn:1~2%、P:0.06%以下、S:0.005%以下、Al:0.06%以下、N:0.006%以下、Cr:0.04~0.5%、Mo:0.05~0.5%、Ti:0.02~0.10%、Nb:0.08%以下を含み、原子比でTi/Moを0.1以上を満たすように含む組成の鋼を、オーステナイト単相域の温度に加熱したのち、880℃以上で仕上圧延を完了し、550~700℃で巻取る、製造方法で製造できるとしている。この高強度鋼板は、引張強さTS:590MPa以上の高強度を有しているが、高成形性を有し、とくに冷間でのプレス成形時の断面形状が複雑な部材のプレス成形が可能であるとしている。
このような、従来行われているよりも高温での温間プレス成形を利用して、高強度のプレス部品を得る方法が例えば特許文献2に記載されている。特許文献2に記載の高強度プレス成形体の製造方法は、鋼板を200~850℃の温度に加熱したのち、強度が必要な部位に、2%以上の塑性歪を付与する温間成形を施す方法である。この方法によれば、鋼板に、所定温度域への加熱と所定量の塑性歪付与とを合わせ施すことにより、所望の高強度を確保することができるとしている。なお、特許文献2に記載された技術で使用する鋼板は、質量%で、C:0.01~0.20%、Si:0.01~3.0%、Mn:0.01~3.0%、P:0.002~0.2%、S:0.001~0.020%、Al:0.005~2.0%、N:0.002~0.01%、Mo:0.01~1.5%を含み、さらにCr:0.01~1.5%、Nb:0.005~0.10%、Ti:0.005~0.10%、V:0.005~0.10%、B:0.0003~0.005%、の1種または2種以上を含有し、Si、P、Mo、Cr、Nb、Ti、V、B含有量の間の特定関係式が所定値以下(140以下)である式(A)を満足する組成を有する鋼板である。
また、特許文献1に記載された技術で製造された鋼板に、このような温間プレス工法を適用すると、張り出し成形部位が割れやすくなるという問題がある。
温間プレス成形に適した鋼板は、金型(ポンチ)と当たり比較的低温(400℃未満)での張出し成形をうける部位に対応して、比較的低温(400℃未満)で均一伸び(ここでは、最高荷重を示すまでの変形量とする)が大きいこと、金型と接触せず、高温(400℃以上)で伸びフランジ成形をうける部位に対応して、高温(400℃以上)での局部伸び(ここでは、最高荷重を示してから破断までの変形量とする)が大きいこと、を兼備する引張特性を有する鋼板であることを新たに見出した。
本発明者らの更なる研究によれば、上記したような組織を有する鋼板(熱延鋼板)は、所定の熱間圧延終了後、巻取温度を600℃未満として、巻き取ったのち、650~750℃の温度域で熱処理を施すことにより、得られることを知見した。
(1)引張強さ:590MPa以上の高強度を有する高強度鋼板であって、試験温度:400℃以上で行った引張試験で得られた、最高荷重を示したのち破断までの変形量が、引張開始から該最高荷重を示す前までの変形量よりも大きく、かつ試験温度:400℃未満で行った引張試験で得られた、引張開始から最高荷重を示す前までの変形量が、引張開始から破断までの全変形量に対する比率で40%以上である引張特性と、フェライト相の面積率が95%以上である実質的にフェライト相単相のマトリックスと該マトリックス中に大きさが10nm未満の合金炭化物がバリアント選択のない状態で分散析出した組織と、を有することを特徴とする温間加工性に優れた高強度鋼板。
~0.5%、W:0.01~1.0%、B:0.0005~0.0040%のうちから選ばれた1種または2種以上を含有し、残部Feおよび不可避的不純物からなる組成を有することを特徴とする高強度鋼板。
(4)(3)において、前記めっき層が溶融亜鉛めっき層または合金化溶融亜鉛めっき層であることを特徴とする高強度鋼板。
(5)質量%で、C:0.01~0.2%、Si:0.5%以下、Mn:2%以下、P:0.03%以下、S:0.01%以下、Al:0.07%以下、N:0.01%以下を含み、さらに、Ti:0.005~0.3%、Nb:0.005~0.6%、V:0.005~1.0%、Mo:0.005~0.5%、W:0.01~1.0%、B:0.0005~0.0040%のうちから選ばれた1種または2種以上を含有し、残部Feおよび不可避的不純物からなる組成を有する鋼素材を、オーステナイト単相温度域に加熱したのち、仕上圧延終了温度:860℃以上とする熱間圧延を施し、巻取温度:400℃以上600℃未満で巻き取り、熱延板とする熱延工程と、ついで、該熱延板の表面スケールを除去したのち、該熱延板に650~750℃の温度域で熱処理を施す熱処理工程とを、順次施すことを特徴とする、引張強さ:590MPa以上を有し、温間加工性に優れた高強度鋼板の製造方法。
(7)(5)において、前記熱処理工程に引続き、溶融亜鉛めっき処理、あるいはさらに合金化処理を施すことを特徴とする高強度鋼板の製造方法。
なお、試験温度:400℃未満の場合の伸び特性は、鋼板から、JIS G 0567に規定されるI型試験片(平行部幅:10mm、GL:50mm)を採取し、400℃未満の試験温度(例えば300℃)で、JIS G 0567の規定に準拠して、引張試験を実施し、得られた荷重−伸び曲線から、全伸び、局部伸びおよび均一伸びを求めるものとする。なお、引張速度は10mm/minとする。
一方、試験温度:400℃以上の場合の伸び特性は、鋼板から、JIS G 0567に規定されるI型試験片(平行部幅:10mm、GL:50mm)を採取し、400℃以上の試験温度(例えば500℃)に加熱して、JIS G 0567の規定に準拠して、引張速度:10mm/minで高温引張試験を実施し、得られた荷重−伸び曲線から、全伸び、均一伸び、局部伸びを算出するものとする。
本発明鋼板では、組織(マトリックス)を、実質的にフェライト相単相とする。組織を、延性に富むフェライト相とすることにより、所望の温間プレス成形性を保持できるうえ、マルテンサイト等低温変態生成物を強化因子とする変態組織強化型鋼板のような温間プレス成形温度に加熱することによる大幅な強度低下はなく、温間プレス成形後にも所望の高強度を維持できる。なお、ここでいう「実質的にフェライト相単相」とは、面積率で5%までの第二相を含む場合も許容する。すなわち、フェライト相が、組織全体に対する面積率で95%以上であることを意味する。5%までの第二相であれば、とくに温間プレス成形温度に加熱することによる大幅な強度低下は認められず、発明の効果を発揮できる。なお、第二相は、好ましくは2%以下である。さらに、本発明鋼板は、上記したマトリックス中に、大きさが10nm未満の合金炭化物が分散析出した組織を有する。マトリックス中に析出する合金炭化物の大きさが10nm以上と大きくなると、炭化物が粗大化し、強度が低下するとともに、局部が小さくなり、温間加工性が低下する。なお、大きさが10nm未満の合金炭化物の分散個数は5×1011個/mm3以上とすることが好ましい。また、ここでいう合金炭化物とは、Ti、Nb、V等の炭化物である。なお、これらの複合となっていてもよい。
微細な合金炭化物が、バリアント選択のない状態で分散析出することにより、高温での引張試験において、局部伸びが均一伸びに比べて大きくなり、かつ低温での引張試験において、均一伸びが局部伸びに比べて大きくなり、温間プレス成形に適した鋼板とすることができる。一方、微細な合金炭化物が、バリアント選択のある状態で分散析出した鋼板の場合には、とくに高温において、局部伸びが均一伸びに比べて大きくなる引張特性(伸び特性)を確保できなくなる。
本発明鋼板は、好ましくは、質量%で、C:0.01~0.2%、Si:0.5%以下、Mn:2%以下、P:0.03%以下、S:0.01%以下、Al:0.07%以下、N:0.01%以下を含み、さらに、Ti:0.005~0.3%、Nb:0.005~0.6%、V:0.005~1.0%、Mo:0.005~0.5%、W:0.01~1.0%、B:0.0005~0.0040%のうちから選ばれた1種または2種以上を含み、残部Feおよび不可避的不純物からなる組成を有する。以下、とくに断わらないかぎり質量%は単に%と記す。
Cは、炭化物を形成し、鋼板の強度を増加させる最も重要な元素である。本発明ではCは、温間プレス成形の成形加工前までの工程、とくに熱間圧延後の熱処理で、マトリックス中に微細炭化物として析出し、部品の高強度化に寄与する。このような効果を得るためには、0.01%以上含有することが好ましい。一方、0.2%を超える含有は、マトリックスを実質的にフェライト単相とすることが難しくなり、延性の低下が著しくなる。このため、Cは0.01~0.2%の範囲に限定することが好ましい。なお、より好ましくは0.18%以下である。また、所望の強度レベルによって、概ねC量を規定することができる。例えば、引張強さTS:590MPa級では、Cは0.01%以上~0.03%以下とすることが好ましく、また、引張強さTS:780MPa級では、Cは0.03%超~0.06%以下とすることが好ましく、また、引張強さTS:980MPa級では、Cは0.06%超~0.09%以下とすることが好ましく、また、引張強さTS:1180MPa級では、Cは0.09%超~0.2%以下とすることが好ましい。
Siは、一般に焼戻軟化抵抗を高める元素であることから、積極的に添加されるが、本発明では表面性状の劣化や合金炭化物のバリアント選択した析出を促進するため、できるだけ低減することが望ましい。また、Siは温間では変形抵抗を高めるため、伸びの上昇を阻害する。このようなことから、本発明ではSiは0.5%以下に限定することが好ましい。なお、より好ましくは0.3%以下、さらに好ましくは0.1%以下である。
Mnは、固溶して鋼板強度を増加させる作用を有する元素であり、このような効果を得るためには0.1%以上含有することが望ましいが、2%を超えて含有すると、偏析が著しくなるとともに、焼入れ性が増大して組織をフェライト相単相とすることが困難となる。このため、Mnは2%以下に限定することが好ましい。なお、より好ましくは0.1~1.6%である。
Pは、固溶強化により鋼板の強度増加に有効に寄与する元素であるが、粒界に偏析しやすく、加工時に顕著な割れを発生させる。このため、本発明では、できるだけ低減することが望ましいが、0.03%以下程度まで低減すれば、このような悪影響は許容できるまで低減される。このようなことから、Pは0.03%以下とすることが好ましい。なお、より好ましくは0.02%以下である。
Sは、MnSを形成し、成形時にボイドの発生を促進し、温間加工性を低下させる。このため、Sはできるだけ低減することが望ましい。0.01%以下程度に低減すれば、このような悪影響は許容できる程度まで低減できる。このため、Sは0.01%以下に限定することが好ましい。なお、より好ましくは0.002%以下である。
Alは、脱酸剤として作用する元素であり、このような効果を得るためには0.01%以上含有することが望ましいが、0.07%を超える含有は、酸化物系介在物が増加しやすく、鋼の清浄度を低下させるとともに、温間加工性を低下させる。このため、Alは0.07%以下に限定することが好ましい。なお、より好ましくは0.03~0.06%である。
Nは、TiNの粗大析出による局部伸び低下という悪影響を及ぼす元素であり、本発明ではできるだけ低減することが望ましい。0.01%を超える含有は、粗大な窒化物を形成し、成形性を低下させる。このため、Nは0.01%以下に限定することが好ましい。なお、より好ましくは0.005%以下である。
Ti、Nb、V、Mo、W、Bはいずれも、微細な炭化物を構成する元素または析出を促進させる作用を有する元素であり、選択して1種または2種以上含有することが好ましい。このような効果を得るためには、Ti:0.005%以上、Nb:0.005%以上、V:0.005%以上、Mo:0.005%以上、W:0.01%以上、B:0.0005%以上、それぞれ含有することが好ましい。一方、Ti:0.3%、Nb:0.6%、V:1.0%、Mo:0.5%、W:1.0%、B:0.0040%を、それぞれ超える含有は、固溶強化により温間加工性を低下させる。このため、含有する場合には、それぞれ、Ti:0.005~0.3%、Nb:0.005~0.6%、V:0.005~1.0%、Mo:0.005~0.5%、W:0.01~1.0%、B:0.0005~0.0040%の範囲に限定することが好ましい。
なお、微細な炭化物(合金炭化物)を形成する組合せとしては、Ti−Mo、Nb−Mo、Ti−Nb−Mo、Ti−W、Ti−Nb−Mo−Wの組合せがより好ましい。またとくに、VとTiとを合わせて含有する場合は、質量比でV/Tiを1.75以下とすることにより、本発明の目的とする微細な炭化物が得やすくなる。
つぎに、本発明鋼板の好ましい製造方法について説明する。
本発明では、上記した組成を有する鋼素材を、出発素材とする。なお、鋼素材の製造方法は、本発明ではとくに限定する必要はなく、通常公知の製造方法がいずれも適用できる。たとえば、上記した組成の溶鋼を、転炉等で溶製し、連続鋳造法等の鋳造方法でスラブ等の鋼素材とすることが好ましいが、本発明ではこれに限定されない。また、連続鋳造後、スラブ等の鋼素材を室温まで冷却せずに、加熱炉に装入し熱間圧延しても、また加熱せず、直接熱間圧延する直送圧延を行っても問題はない。
圧延終了温度が850℃未満では、表層組織が粗大化し、温間加工性が低下する。このため、圧延終了温度は850℃以上とすることが好ましい。なお、より好ましくは880~940℃である。
熱延工程後、熱延板は、酸洗等により、表面スケールを除去される。そして、その後、熱処理工程を施す。熱処理工程では、加熱温度:650~750℃で、好ましくは,保持時間:10~300sの間保持する熱処理を施されたのち、冷却される。冷却は、とくに限定する必要はないが、空冷、放冷とすることが好ましい。熱処理工程では、650~750℃での熱処理により所望の合金炭化物を析出させる。加熱温度が650℃未満では、合金炭化物の析出が遅く、所望の10nm未満の合金炭化物の、バリエント選択のない状態での分散析出は認められない。また、ベイナイトが一部に残留することで、フェライト単相のマトリックスが得にくくなる。一方、750℃を超える高温では、析出が速く、粗大な合金炭化物となり、所望の高強度を確保できなくなる。また、組織の一部が、オーステナイトへ変態し、冷却後にフェライト+マルテンサイト組織となる。
なお、熱処理工程を施された鋼板は、さらに表面にめっき層を付着させる、めっき処理を施して、めっき鋼板としてもよい。めっき層としては、溶融亜鉛めっき層、電気亜鉛めっき層、溶融アルミめっき層等がいずれも、例示できる。
以下、実施例に基づいて、さらに本発明を詳細に説明する。
(1)組織観察
得られた鋼板から、組織観察用試験片を採取し、圧延方向と平行な断面(L断面)について、研磨し、ナイタール腐食して光学顕微鏡(倍率:400倍)および走査型電子顕微鏡(倍率:5000倍)で、組織を観察し、撮像し画像解析装置を用いて、種類の同定および各相の組織分率を測定した。さらに、鋼板から採取した薄膜を用いて、エネルギー分散型X線分光装置(EDX)付き透過型電子顕微鏡により、マトリックス中に析出した析出物中に含まれる成分を分析し、析出物の種類(合金炭化物)を同定するとともに、析出物(合金炭化物)の大きさと、その分散状態を調査した。なお、分散状態は、バリアント選択なしの析出か、あるいはバリアント選択ありの析出か、で分類した。
得られた鋼板から、JIS G 0567に規定されるI型試験片(平行部幅:10mm、GL:50mm)を採取し、室温(20℃)で、JIS Z 2241の規定に準拠して、引張試験を実施し、引張特性(降伏強さYS、引張強さTS、伸びEl)を測定した。また、400℃未満の試験温度(300℃)で、JIS G 0567の規定に準拠して、引張試験を実施し、得られた荷重−伸び曲線から、全伸びとして引張開始から破断までの全伸びを、および、均一伸びとして引張開始から最高荷重を示す前までの変形量を求め、(均一伸び)/(全伸び)を算出した。
なお、得られた鋼板から、引張試験片を採取し、加熱温度:700℃で、保持時間:3min間保持したのち、加工せずに、空冷する、温間プレス成形の熱履歴をシミュレートし、室温で、引張試験を実施し、引張強さTSを測定し、温間プレス成形加熱による強度の変化をみた。
Claims (7)
- 引張強さ:590MPa以上の高強度を有する高強度鋼板であって、試験温度:400℃以上で行った引張試験で得られた、最高荷重を示したのち破断までの変形量が、引張開始から該最高荷重を示す前までの変形量よりも大きく、かつ試験温度:400℃未満で行った引張試験で得られた、引張開始から最高荷重を示す前までの変形量が、引張開始から破断までの全変形量に対する比率で40%以上である引張特性と、フェライト相の面積率が95%以上である実質的にフェライト相単相のマトリックスと該マトリックス中に大きさが10nm未満の合金炭化物がバリアント選択のない状態で分散析出した組織と、を有することを特徴とする温間加工性に優れた高強度鋼板。
- 質量%で、
C:0.01~0.2%、 Si:0.5%以下、
Mn:2%以下、 P:0.03%以下、
S:0.01%以下、 Al:0.07%以下、
N:0.01%以下
を含み、さらに、Ti:0.005~0.3%、Nb:0.005~0.6%、V:0.005~1.0%、Mo:0.005~0.5%、W:0.01~1.0%、B:0.0005~0.0040%のうちから選ばれた1種または2種以上を含有し、残部Feおよび不可避的不純物からなる組成を有することを特徴とする請求項1に記載の高強度鋼板。 - 前記高強度鋼板が、表面にめっき層を有することを特徴とする請求項1または2に記載の高強度鋼板。
- 前記めっき層が、溶融亜鉛めっき層または合金化溶融亜鉛めっき層であることを特徴とする請求項3に記載の高強度鋼板。
- 質量%で、
C:0.01~0.2%、 Si:0.5%以下、
Mn:2%以下、 P:0.03%以下、
S:0.01%以下、 Al:0.07%以下、
N:0.01%以下
を含み、さらに、Ti:0.005~0.3%、Nb:0.005~0.6%、V:0.005~1.0%、Mo:0.005~0.5%、W:0.01~1.0%、B:0.0005~0.0040%のうちから選ばれた1種または2種以上を含有し、残部Feおよび不可避的不純物からなる組成を有する鋼素材を、オーステナイト単相温度域に加熱したのち、仕上圧延終了温度:860℃以上とする熱間圧延を施し、巻取温度:400℃以上600℃未満で巻き取り、熱延板とする熱延工程と、ついで、該熱延板の表面スケールを除去したのち、該熱延板に650~750℃の温度域で熱処理を施す熱処理工程と、を順次施すことを特徴とする、引張強さ:590MPa以上を有し、温間加工性に優れた高強度鋼板の製造方法。 - 前記熱処理工程を施された熱延板に、さらにめっき処理を施すことを特徴とする請求項5に記載の高強度鋼板の製造方法。
- 前記熱処理工程に引続き、溶融亜鉛めっき処理、あるいはさらに合金化処理を施すことを特徴とする請求項5に記載の高強度鋼板の製造方法。
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201180018211.2A CN102834539B (zh) | 2010-04-09 | 2011-04-11 | 温加工性优良的高强度钢板及其制造方法 |
KR1020157031295A KR20150127298A (ko) | 2010-04-09 | 2011-04-11 | 온간 가공성이 우수한 고강도 강판 및 그 제조 방법 |
KR1020127026949A KR20120135521A (ko) | 2010-04-09 | 2011-04-11 | 온간 가공성이 우수한 고강도 강판 및 그 제조 방법 |
CA2795714A CA2795714C (en) | 2010-04-09 | 2011-04-11 | High strength steel sheet having excellent warm stamp formability and method for manufacturing the same |
EP11766051.4A EP2557193B1 (en) | 2010-04-09 | 2011-04-11 | High-strength steel sheet having excellent hot rolling workability, and process for production thereof |
US13/639,272 US20130192725A1 (en) | 2010-04-09 | 2011-04-11 | High strength steel sheet having excellent warm stamp formability and method for manufacturing the same |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2010090796A JP5609223B2 (ja) | 2010-04-09 | 2010-04-09 | 温間加工性に優れた高強度鋼板およびその製造方法 |
JP2010-090796 | 2010-04-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2011126154A1 true WO2011126154A1 (ja) | 2011-10-13 |
Family
ID=44763082
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2011/059459 WO2011126154A1 (ja) | 2010-04-09 | 2011-04-11 | 温間加工性に優れた高強度鋼板およびその製造方法 |
Country Status (8)
Country | Link |
---|---|
US (1) | US20130192725A1 (ja) |
EP (1) | EP2557193B1 (ja) |
JP (1) | JP5609223B2 (ja) |
KR (2) | KR20150127298A (ja) |
CN (1) | CN102834539B (ja) |
CA (1) | CA2795714C (ja) |
TW (1) | TWI485261B (ja) |
WO (1) | WO2011126154A1 (ja) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2765211A1 (en) * | 2011-11-08 | 2014-08-13 | JFE Steel Corporation | High-tensile-strength hot-rolled steel sheet and method for producing same |
CN104040001A (zh) * | 2012-01-05 | 2014-09-10 | 杰富意钢铁株式会社 | 合金化热镀锌钢板 |
US20140305550A1 (en) * | 2011-11-08 | 2014-10-16 | Jfe Steel Corporation | High strength hot rolled steel sheet and method for producing the same |
JP5610089B2 (ja) * | 2011-10-25 | 2014-10-22 | Jfeスチール株式会社 | 高張力熱延鋼板およびその製造方法 |
Families Citing this family (25)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2719787B1 (en) | 2011-06-10 | 2016-04-13 | Kabushiki Kaisha Kobe Seiko Sho | Hot press molded article, method for producing same, and thin steel sheet for hot press molding |
JP5754279B2 (ja) * | 2011-07-20 | 2015-07-29 | Jfeスチール株式会社 | 温間成形用高強度鋼板およびその製造方法 |
JP5887903B2 (ja) * | 2011-12-15 | 2016-03-16 | Jfeスチール株式会社 | 溶接性に優れた高強度熱延鋼板およびその製造方法 |
JP5884476B2 (ja) * | 2011-12-27 | 2016-03-15 | Jfeスチール株式会社 | 曲げ加工性に優れた高張力熱延鋼板およびその製造方法 |
JP5957878B2 (ja) * | 2011-12-27 | 2016-07-27 | Jfeスチール株式会社 | 温間成形用高強度熱延鋼板およびその製造方法 |
JP5578288B2 (ja) * | 2012-01-31 | 2014-08-27 | Jfeスチール株式会社 | 発電機リム用熱延鋼板およびその製造方法 |
WO2013132821A1 (ja) * | 2012-03-06 | 2013-09-12 | Jfeスチール株式会社 | 温間プレス成形方法および自動車骨格部品 |
WO2013132823A1 (ja) * | 2012-03-06 | 2013-09-12 | Jfeスチール株式会社 | 温間プレス成形方法および自動車骨格部品 |
JP5870825B2 (ja) * | 2012-04-06 | 2016-03-01 | 新日鐵住金株式会社 | 合金化溶融亜鉛めっき熱延鋼板およびその製造方法 |
MX2014012798A (es) * | 2012-04-23 | 2015-04-14 | Kobe Steel Ltd | Metodo de fabricacion de hoja de acero galvanizado para estampacion en caliente, hoja de acero galvanizado y recocido por inmersion en caliente para estampacion en caliente y metodo de fabricacion de las mismas, y componente estampado en caliente. |
JP5994356B2 (ja) * | 2012-04-24 | 2016-09-21 | Jfeスチール株式会社 | 形状凍結性に優れた高強度薄鋼板およびその製造方法 |
ES2612184T3 (es) * | 2012-05-08 | 2017-05-12 | Tata Steel Ijmuiden Bv | Parte de chasis automotriz fabricado a partir de chapa de acero laminada en caliente, conformable, de alta resistencia |
JP5915412B2 (ja) * | 2012-06-29 | 2016-05-11 | Jfeスチール株式会社 | 曲げ性に優れた高強度熱延鋼板およびその製造方法 |
WO2014115549A1 (ja) * | 2013-01-24 | 2014-07-31 | Jfeスチール株式会社 | 高強度ラインパイプ用熱延鋼板 |
CA2898421C (en) * | 2013-02-11 | 2017-09-12 | Tata Steel Ijmuiden B.V. | A high-strength hot-rolled steel strip or sheet with excellent formability and fatigue performance and a method of manufacturing said steel strip or sheet |
CN103205639B (zh) * | 2013-03-14 | 2015-02-18 | 长安大学 | 一种装载机铲刀刃及其制备方法 |
JP5904342B2 (ja) * | 2013-03-29 | 2016-04-13 | Jfeスチール株式会社 | 高強度熱延鋼板とその製造方法 |
JP6052504B2 (ja) * | 2013-03-29 | 2016-12-27 | Jfeスチール株式会社 | 高強度熱延鋼板とその製造方法 |
JP6052503B2 (ja) * | 2013-03-29 | 2016-12-27 | Jfeスチール株式会社 | 高強度熱延鋼板とその製造方法 |
CN107923014B (zh) * | 2015-08-19 | 2020-06-16 | 杰富意钢铁株式会社 | 高强度钢板和其制造方法 |
CN107923013B (zh) * | 2015-08-19 | 2020-06-16 | 杰富意钢铁株式会社 | 高强度钢板及其制造方法 |
KR101899677B1 (ko) * | 2016-12-20 | 2018-09-17 | 주식회사 포스코 | 가공성이 우수한 용융도금강재 및 그 제조방법 |
CN110806725B (zh) * | 2019-11-07 | 2021-03-12 | 山西太钢不锈钢股份有限公司 | 拉伸试样的加工方法及装置 |
CN110951956B (zh) * | 2019-12-19 | 2021-07-27 | 中北大学 | 一种超高塑性twip钢的生产方法 |
CN115595505B (zh) * | 2022-10-28 | 2024-03-19 | 武汉钢铁有限公司 | 具有耐高温高扩孔率的600MPa级桥壳钢及生产方法 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002322541A (ja) | 2000-10-31 | 2002-11-08 | Nkk Corp | 材質均一性に優れた高成形性高張力熱延鋼板ならびにその製造方法および加工方法 |
JP3775337B2 (ja) * | 2002-04-26 | 2006-05-17 | Jfeスチール株式会社 | 材質均一性に優れた高成形性高張力熱延鋼板ならびにその製造方法および加工方法 |
JP3962186B2 (ja) | 1998-12-11 | 2007-08-22 | 新日本製鐵株式会社 | 熱処理硬化能に優れた薄鋼板及びその鋼板を用いた高強度プレス成形体の製造方法 |
JP2009084643A (ja) * | 2007-09-28 | 2009-04-23 | Kobe Steel Ltd | 疲労特性及び伸びフランジ性バランスに優れた熱延鋼板 |
WO2009118945A1 (ja) * | 2008-03-26 | 2009-10-01 | 新日本製鐵株式会社 | 疲労特性と伸びフランジ性に優れた熱延鋼板およびその製造方法 |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3233743B2 (ja) * | 1993-06-28 | 2001-11-26 | 株式会社神戸製鋼所 | 伸びフランジ性に優れた高強度熱延鋼板 |
JP3725367B2 (ja) * | 1999-05-13 | 2005-12-07 | 株式会社神戸製鋼所 | 伸びフランジ性に優れた超微細フェライト組織高強度熱延鋼板およびその製造方法 |
WO2002036840A1 (fr) * | 2000-10-31 | 2002-05-10 | Nkk Corporation | Tole d"acier laminee a chaud presentant une resistance elevee a la traction et procede de fabrication |
TWI248977B (en) * | 2003-06-26 | 2006-02-11 | Nippon Steel Corp | High-strength hot-rolled steel sheet excellent in shape fixability and method of producing the same |
AU2005227564B2 (en) * | 2004-03-31 | 2008-02-21 | Jfe Steel Corporation | High-rigidity high-strength thin steel sheet and method for producing same |
US20090162691A1 (en) * | 2005-04-20 | 2009-06-25 | Nippon Steel Corporation | Hot dip galvannealed steel sheet and method for producing the same |
ES2528427T3 (es) * | 2005-08-05 | 2015-02-09 | Jfe Steel Corporation | Lámina de acero de alta tracción y procedimiento para producir la misma |
JP5040197B2 (ja) * | 2006-07-10 | 2012-10-03 | Jfeスチール株式会社 | 加工性に優れ、かつ熱処理後の強度靭性に優れた熱延薄鋼板およびその製造方法 |
-
2010
- 2010-04-09 JP JP2010090796A patent/JP5609223B2/ja not_active Expired - Fee Related
-
2011
- 2011-04-08 TW TW100112401A patent/TWI485261B/zh not_active IP Right Cessation
- 2011-04-11 EP EP11766051.4A patent/EP2557193B1/en active Active
- 2011-04-11 KR KR1020157031295A patent/KR20150127298A/ko not_active Application Discontinuation
- 2011-04-11 CA CA2795714A patent/CA2795714C/en not_active Expired - Fee Related
- 2011-04-11 CN CN201180018211.2A patent/CN102834539B/zh active Active
- 2011-04-11 WO PCT/JP2011/059459 patent/WO2011126154A1/ja active Application Filing
- 2011-04-11 US US13/639,272 patent/US20130192725A1/en not_active Abandoned
- 2011-04-11 KR KR1020127026949A patent/KR20120135521A/ko active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3962186B2 (ja) | 1998-12-11 | 2007-08-22 | 新日本製鐵株式会社 | 熱処理硬化能に優れた薄鋼板及びその鋼板を用いた高強度プレス成形体の製造方法 |
JP2002322541A (ja) | 2000-10-31 | 2002-11-08 | Nkk Corp | 材質均一性に優れた高成形性高張力熱延鋼板ならびにその製造方法および加工方法 |
JP3775337B2 (ja) * | 2002-04-26 | 2006-05-17 | Jfeスチール株式会社 | 材質均一性に優れた高成形性高張力熱延鋼板ならびにその製造方法および加工方法 |
JP2009084643A (ja) * | 2007-09-28 | 2009-04-23 | Kobe Steel Ltd | 疲労特性及び伸びフランジ性バランスに優れた熱延鋼板 |
WO2009118945A1 (ja) * | 2008-03-26 | 2009-10-01 | 新日本製鐵株式会社 | 疲労特性と伸びフランジ性に優れた熱延鋼板およびその製造方法 |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5610089B2 (ja) * | 2011-10-25 | 2014-10-22 | Jfeスチール株式会社 | 高張力熱延鋼板およびその製造方法 |
EP2765211A1 (en) * | 2011-11-08 | 2014-08-13 | JFE Steel Corporation | High-tensile-strength hot-rolled steel sheet and method for producing same |
US20140305550A1 (en) * | 2011-11-08 | 2014-10-16 | Jfe Steel Corporation | High strength hot rolled steel sheet and method for producing the same |
EP2765211A4 (en) * | 2011-11-08 | 2015-11-04 | Jfe Steel Corp | HOT ROLLED STEEL SHEET OF HIGH TENSILE STRENGTH, AND METHOD OF MANUFACTURING THE SAME |
CN104040001A (zh) * | 2012-01-05 | 2014-09-10 | 杰富意钢铁株式会社 | 合金化热镀锌钢板 |
CN104040001B (zh) * | 2012-01-05 | 2016-03-09 | 杰富意钢铁株式会社 | 合金化热镀锌钢板 |
Also Published As
Publication number | Publication date |
---|---|
US20130192725A1 (en) | 2013-08-01 |
CA2795714A1 (en) | 2011-10-13 |
TW201215685A (en) | 2012-04-16 |
JP2011219826A (ja) | 2011-11-04 |
EP2557193B1 (en) | 2020-04-01 |
EP2557193A4 (en) | 2017-04-19 |
EP2557193A1 (en) | 2013-02-13 |
CN102834539B (zh) | 2015-04-08 |
CA2795714C (en) | 2015-11-24 |
CN102834539A (zh) | 2012-12-19 |
KR20120135521A (ko) | 2012-12-14 |
JP5609223B2 (ja) | 2014-10-22 |
TWI485261B (zh) | 2015-05-21 |
KR20150127298A (ko) | 2015-11-16 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP5609223B2 (ja) | 温間加工性に優れた高強度鋼板およびその製造方法 | |
KR101621639B1 (ko) | 강판, 도금 강판 및 그들의 제조 방법 | |
JP5549414B2 (ja) | 形状凍結性に優れた冷延薄鋼板およびその製造方法 | |
CN107923013B (zh) | 高强度钢板及其制造方法 | |
JP5126399B2 (ja) | 伸びフランジ性に優れた高強度冷延鋼板およびその製造方法 | |
CN111527224B (zh) | 高强度钢板及其制造方法 | |
JP5803836B2 (ja) | 熱間プレス鋼板部材、その製造方法と熱間プレス用鋼板 | |
CN112930413A (zh) | 高强度钢板及其制造方法 | |
JP2017048412A (ja) | 溶融亜鉛めっき鋼板、合金化溶融亜鉛めっき鋼板、およびそれらの製造方法 | |
JP2014080665A (ja) | 高強度冷延鋼板およびその製造方法 | |
JP2007002276A (ja) | 高強度鋼板およびその製造方法 | |
WO2013094130A1 (ja) | 高強度鋼板およびその製造方法 | |
JP5835621B2 (ja) | 熱間プレス鋼板部材およびその製造方法ならびに熱間プレス用鋼板 | |
JP5857913B2 (ja) | 熱間成形鋼板部材およびその製造方法ならびに熱間成形用鋼板 | |
JP6048623B2 (ja) | 高強度鋼板 | |
CN107208207B (zh) | 高强度钢板及其制造方法 | |
CN115461482A (zh) | 钢板、部件及其制造方法 | |
JP5310920B2 (ja) | 耐時効性と焼付き硬化性に優れた高強度冷延鋼板 | |
JP5903884B2 (ja) | 耐腰折れ性に優れた高強度薄鋼板の製造方法 | |
JP4367205B2 (ja) | 鋼板の歪時効処理方法および高強度構造部材の製造方法 | |
CN111315907B (zh) | 钢板 | |
JP7215646B1 (ja) | 高強度鋼板およびその製造方法 | |
JP5245948B2 (ja) | 冷延鋼帯の製造方法 | |
JP5682357B2 (ja) | 合金化溶融亜鉛めっき鋼板およびその製造方法 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 201180018211.2 Country of ref document: CN |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 11766051 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 2795714 Country of ref document: CA |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2979/KOLNP/2012 Country of ref document: IN |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
ENP | Entry into the national phase |
Ref document number: 20127026949 Country of ref document: KR Kind code of ref document: A |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2011766051 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 13639272 Country of ref document: US |