WO2015079699A1 - 焼付け硬化型溶融亜鉛めっき鋼板 - Google Patents
焼付け硬化型溶融亜鉛めっき鋼板 Download PDFInfo
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- WO2015079699A1 WO2015079699A1 PCT/JP2014/005944 JP2014005944W WO2015079699A1 WO 2015079699 A1 WO2015079699 A1 WO 2015079699A1 JP 2014005944 W JP2014005944 W JP 2014005944W WO 2015079699 A1 WO2015079699 A1 WO 2015079699A1
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- Prior art keywords
- steel sheet
- bake
- ferrite
- base steel
- dip galvanized
- Prior art date
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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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- 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
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- 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
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
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- 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
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B15/043—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of metal
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- 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
- B32B15/18—Layered products comprising a layer of metal comprising iron or steel
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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
- 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
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
- C21D1/76—Adjusting the composition of the atmosphere
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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
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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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
- C21D8/0247—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
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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
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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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- 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
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- 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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C—CHEMISTRY; METALLURGY
- 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
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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
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
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- 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
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- 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
- C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
- C23C2/36—Elongated material
- C23C2/40—Plates; Strips
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- 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
- C23C30/00—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process
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- 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
- C23C30/00—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process
- C23C30/005—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process on hard metal substrates
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- 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
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F17/00—Multi-step processes for surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by subclass C21D or C22F or class C25
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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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- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y10T428/12771—Transition metal-base component
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- Y10T428/12799—Next to Fe-base component [e.g., galvanized]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y10T428/12972—Containing 0.01-1.7% carbon [i.e., steel]
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Definitions
- the present invention relates to a bake-hardening hot-dip galvanized steel sheet that is optimal for manufacturing automobile outer plates, structural framework materials, and other machine structural parts.
- Patent Documents 1 to 3 disclose a method for manufacturing a bake hardened steel sheet that can be manufactured in a continuous annealing furnace.
- Patent Document 4 discloses a method for improving the volume fraction of intragranular carbides to 80% or more with respect to all carbides precipitated during continuous annealing and overaging treatment.
- Patent Document 5 discloses a method of setting the intragranular carbide to 4 ⁇ 10 4 pieces / mm 2 or more in order to obtain paint bake hardenability at a low temperature of 150 ° C. or lower.
- Patent Document 6 discloses a method for manufacturing a hot dip galvanized steel sheet that has been hot dip galvanized for improving corrosion resistance.
- Patent Document 7 discloses a method of controlling the size and amount of Ti-based precipitates in an ultra-low carbon steel with C ⁇ 0.005%.
- Japanese Patent Laid-Open No. 56-119736 JP 58-019442 A Japanese Patent Laid-Open No. 02-125817 JP 05-059445 A Japanese Patent Laid-Open No. 06-073498 Japanese Patent Laid-Open No. 58-031035 JP 2002-167646 A
- the object of the present invention is to use low carbon steel that is relatively easy to melt, and at a low production cost, it is suitable for automobile outer panels, has bake hardenability and corrosion resistance, and has good press formability.
- An object of the present invention is to provide a bake hardening type hot dip galvanized steel sheet that does not cause blister defects in hot dip galvanizing.
- the present inventors have intensively studied to solve the above problems. In that process, the present inventors thought that blister generation can be suppressed by trapping hydrogen, which is the cause of blister generation, in the steel sheet and preventing diffusion to the surface.
- the present inventors thought that blister generation can be suppressed by trapping hydrogen, which is the cause of blister generation, in the steel sheet and preventing diffusion to the surface.
- Ti is used in order to use the Ti-based precipitates disclosed in Patent Document 7, in the case of low carbon steel, a large amount of fine TiC is generated, so that the strength is increased, which is necessary as an outer panel. Moldability was not obtained.
- Patent Documents 4 and 5 in low-carbon steel cementite can be generated in ferrite, so the effect of hydrogen trap by cementite was expected.
- the blister suppression effect could not be obtained simply by controlling the location and number density of cementite.
- the present inventors have found that the surface area of the interface between ferrite and cementite has the most influence on the hydrogen trap characteristics. And, when adjusting the surface area, considering the composition of the underlying steel sheet, metal structure, hydrogen concentration in the steel, and the amount of plating layer deposited, the occurrence of blisters can be suppressed and the formability optimal as an automobile outer plate It was clarified that can be achieved.
- a bake hardening type hot dip galvanized steel sheet having a base steel sheet and a plating layer formed on the base steel sheet, wherein the base steel sheet is in mass% and C: 0.015 to 0.100% , Si: 0.01 to 0.30%, Mn: 0.1 to 1.0%, P: 0.010 to 0.070%, S: 0.003 to 0.020%, Sol.
- the balance is made of iron and inevitable impurities
- the metal structure of the base steel sheet is composed of a ferrite phase and a cementite phase
- the average particle diameter of ferrite is 10-30 ⁇ m
- the surface area of the interface between ferrite and cementite per unit volume is 1.0-10.0 / mm
- the hydrogen concentration in the steel of the base steel sheet is less than 0.1 ppm
- the bake hardened hot dip galvanized steel sheet, wherein the zinc coating amount of the plating layer is 40 to 100 g / m 2 with respect to the surface area of the steel sheet.
- the base steel sheet is in mass%, further Ti: 0.001 to 0.1%, Nb: 0.001 to 0.1%, Zr: 0.001 to 0.1%, Cr: 0.00. Contains at least one selected from 001 to 0.1%, Cu: 0.001 to 0.1%, Ni: 0.001 to 0.1% and V: 0.001 to 0.1%.
- a baking hardening type that is suitable for an automobile outer plate and the like, has a bake hardenability, corrosion resistance, and a good press formability, and does not cause blister defects in hot dip galvanizing, while having a low production cost.
- a hot-dip galvanized steel sheet can be provided. That is, the present invention can contribute to improving the safety of passengers and preserving the global environment through increasing the strength and weight of automobiles.
- the bake hardened hot dip galvanized steel sheet of the present invention has a base steel sheet and a plating layer formed on the base steel sheet.
- the underlying steel plate is, by mass, C: 0.015 to 0.100%, Si: 0.01 to 0.30%, Mn: 0.1 to 1.0%, P: 0.00. 010 to 0.070%, S: 0.003 to 0.020%, Sol. Al: 0.01% to 0.10%, N: 0.002% to 0.005%, with the balance being iron and unavoidable impurities.
- the base steel sheet of the present invention may further contain B: 0.0010 to 0.0050%.
- the base steel sheet of the present invention is in mass%, and further Ti: 0.001 to 0.1%, Nb: 0.001 to 0.1%, Zr: 0.001 to 0.1%, Cr: 0 0.001 to 0.1%, Cu: 0.001 to 0.1%, Ni: 0.001 to 0.1%, and V: 0.001 to 0.1%. May be. First, the reasons for limiting the chemical components of the base steel sheet will be described.
- C 0.015 to 0.100%
- C has an effect of strengthening the steel sheet, and has an effect of suppressing cement blisters by generating cementite and trapping hydrogen. If the C content is less than 0.015%, the effect of suppressing blisters is not sufficient. On the other hand, if the C content exceeds 0.100%, the strength increases excessively and the workability is impaired. Therefore, the C content is 0.015 to 0.100%.
- strength of a bake hardening type hot-dip galvanized steel sheet can be adjusted with content of C, according to desired intensity
- Si 0.01 to 0.30%
- the desiliconization cost increases remarkably. If the Si content exceeds 0.30%, Si oxide is formed during the heating and holding for the annealing treatment after cold rolling, thereby inhibiting the adhesion of hot dip galvanizing. Therefore, the Si content needs to be 0.01 to 0.30%.
- Mn 0.1 to 1.0%
- Mn is an element that contributes to strengthening of the steel sheet at the same time as detoxifying S by forming MnS and improving the workability of the steel sheet. If the Mn content is less than 0.1%, the effect of forming MnS is not sufficient. On the other hand, if the Mn content exceeds 1.0%, the strength increases excessively and the workability is impaired. Therefore, the Mn content needs to be 0.1 to 1.0%. Moreover, since the intensity
- P 0.010 to 0.070%
- the dephosphorization cost is remarkably increased. If the P content exceeds 0.070%, the strength increases excessively and the workability is impaired. Therefore, the P content needs to be 0.010 to 0.070%.
- Sol. Al 0.01 to 0.10% Al is used for deoxidation. Sol. If the Al content is less than 0.01%, the effect is not sufficient and the risk of surface defects is increased. On the other hand, Sol. If the Al content exceeds 0.10%, the effect of deoxidation is saturated, which is uneconomical. Therefore, Sol. The Al content is 0.01 to 0.10%.
- N 0.002 to 0.005%
- the base steel sheet in the present invention often contains N as an impurity. If the N content exceeds 0.005%, moldability deterioration and surface defects are caused. On the other hand, in order to make the N content less than 0.002%, the denitrification cost increases remarkably. Therefore, the N content needs to be 0.002 to 0.005%.
- the balance is iron and inevitable impurities
- the essential components contained in the base steel sheet in the present invention are as described above, and the balance is composed of iron and steel raw materials or inevitable impurity elements that can be mixed in the manufacturing process.
- the base steel plate in the present invention may further contain a small amount of other elements as long as the above-described effects of the component elements are not impaired.
- elements that do not impair the effects of the present invention and inevitable impurity elements include Mo, Cr, Ti, Nb, V, Cu, Ni, B, Ca, and Zr. These elements have effects such as increasing the strength. However, when there is too much content of these elements, ductility and surface properties will deteriorate.
- Mo is 0.5% or less
- Cr is 1.0% or less
- Ti is 0.2% or less
- Nb is 0.1% or less
- V is 0.1% or less
- Cu should be suppressed to 1.0% or less
- Ni to 1.0% or less Ca to 0.005% or less
- Zr to 0.1% or less.
- the base steel sheet further contains B: 0.0010 to 0.0050%.
- B 0.0010 to 0.0050%
- B has the effect of combining with solid solution N to produce coarse BN and detoxifying N, and is added as necessary. If the content of B is less than 0.0010%, the above effect is not sufficient. If it exceeds 0.0050%, the aging property is excessively increased and stretcher strain is likely to be generated.
- the content of B is preferably 0.0010 to 0.0050%.
- the base steel plate is Ti: 0.001 to 0.1%, Nb: 0.001 to 0.1%, Zr: 0.001 to 0.1%, Cr : At least one selected from 0.001 to 0.1%, Cu: 0.001 to 0.1%, Ni: 0.001 to 0.1%, and V: 0.001 to 0.1% Furthermore, it is preferable to contain.
- Ti 0.001 to 0.1%
- Ti combines with solute N to generate TiN.
- Ti has the effect of detoxifying N. If the Ti content is less than 0.001%, the above effects are not sufficient. If the Ti content exceeds 0.1%, TiC may be excessively formed and elongation may deteriorate. Therefore, when Ti is contained, the Ti content is preferably 0.001 to 0.1%.
- Nb 0.001 to 0.1%
- the base steel sheet contains Nb
- Zr 0.001 to 0.1%
- the Zr content is preferably 0.001 to 0.1%.
- Cr 0.001 to 0.1%
- the content of Cr is less than 0.001%, the above effect is not sufficient. If the Cr content exceeds 0.1%, the elongation may deteriorate. Therefore, when Cr is contained, the Cr content is preferably 0.001 to 0.1%.
- Cu 0.001 to 0.1%
- the Cu content is preferably 0.001 to 0.1%.
- Ni 0.001 to 0.1%
- the Ni content is preferably 0.001 to 0.1%.
- V 0.001 to 0.1%
- the content of V is preferably 0.001 to 0.1%.
- the metal structure of the present invention is composed of a ferrite phase and a cementite phase, has an average ferrite particle size of 10 to 30 ⁇ m, and a surface area of an interface between ferrite and cementite per unit volume of 1.0 to 10.0 / mm (mm 2 / mm 3 ).
- the ferrite phase has the effect of increasing strength and workability
- the cementite phase has the effect of suppressing blistering by hydrogen trapping.
- the pearlite phase is a layered structure of a ferrite phase and a cementite phase, it is composed of a ferrite phase and a cementite phase.
- the low temperature transformation phase such as bainite and martensite is not generated as much as possible from the viewpoint of workability. If the content of the low-temperature transformation phase is 5% by volume or less, the influence is small, so these phases may be included.
- carbides, nitrides, and sulfides of contained metal elements may be included depending on the content of each element.
- it can confirm that a metal structure is comprised from a ferrite phase and a cementite phase by the method as described in an Example.
- the average ferrite particle size is the average ferrite particle size obtained by measurement by the method described in the examples.
- the surface area of the interface between ferrite and cementite per unit volume is 1.0-10.0 / mm
- the surface area of the ferrite / cementite interface per unit volume is 1.0-10.0 / mm
- the occurrence of blistering in hot dip galvanizing can be suppressed. If the surface area is less than 1.0 / mm, this effect is not sufficient, and if it exceeds 10.0 / mm, the local ductility of the steel sheet is lowered and workability is deteriorated.
- Hydrogen concentration in steel is less than 0.1 ppm Hydrogen penetrates from the atmospheric gas in the heat treatment step after cold rolling and is enclosed in the steel plate during the plating process, causing blistering after plating. Therefore, it is necessary to evaluate the hydrogen concentration in the steel sheet after plating. When the value is 0.1 ppm or more, it is difficult to suppress the generation of blisters even if the metal structure is appropriately controlled. Therefore, the hydrogen concentration in steel must be less than 0.1 ppm.
- the hydrogen concentration in steel after plating is measured by an inert gas melting-thermal conductivity method without removing the plating layer.
- the plating is removed by pickling, hydrogen penetrates into the steel at that time, and when the plating is mechanically removed, hydrogen is released and the hydrogen concentration decreases, so the analysis is performed without removing the plating layer. There is a need to. Note that the temperature rising analysis method is not suitable because galvanization suppresses hydrogen release.
- the plating layer includes an alloyed zinc plating layer mainly containing an Fe—Zn alloy in which Fe in the steel can be diffused during zinc plating by an alloying reaction. .
- the plating layer includes Fe, Al, Sb, Pb, Bi, Mg, Ca, Be, Ti, Cu, Ni, Co, Cr, Mn, P, B, Sn, Zr, Hf, Sr, V, Se and REM may be included as long as the effects of the present invention are not impaired.
- the zinc adhesion amount of the plating layer is 40 to 100 g / m 2 with respect to the steel plate surface area.
- the zinc adhesion amount of the plating layer is 40 to 100 g / m 2 with respect to the steel plate surface area. If the zinc adhesion amount is in the above range, necessary corrosion resistance and workability, and blister resistance can be imparted to a steel sheet for processing including automobile outer plate applications. More specifically, when the zinc adhesion amount is less than 40 g / m 2 , sufficient corrosion resistance cannot be obtained. On the other hand, when the zinc adhesion amount exceeds 100 g / m 2 , the surface friction coefficient of the plated steel sheet increases and the workability deteriorates. Further, the effect of confining hydrogen in the steel sheet by the plating layer is increased, and blisters are easily generated. Therefore, the zinc adhesion amount of the plating layer needs to be 40 to 100 g / m 2 with respect to the steel plate surface area.
- a steel slab is manufactured so that the composition of the base steel sheet is in the above range.
- the manufacturing method of the steel slab is not particularly limited. For example, a method of melting steel by adopting a known melting method such as a converter or an electric furnace, and then converting the steel into a steel slab (steel material) by a continuous casting method. Is mentioned.
- the steel slab may be hot-rolled as it is, or after being cooled to an arbitrary temperature, re-heated in a heating furnace, and then hot-rolled.
- the heating temperature for reheating is preferably 1150 ° C. to 1300 ° C. If the said heating temperature is less than 1150 degreeC, a deformation resistance is large and rolling to the desired board thickness may become difficult. On the other hand, when the heating temperature exceeds 1300 ° C., the surface oxidation of the ingot becomes remarkable, and the surface appearance of the product is often impaired.
- the average cooling rate up to 600 ° C. is set to 100 ° C./sec or more, and winding is performed at 500 ° C. or less, so that the surface area of the interface between ferrite and cementite is desired. It is preferable to adjust to the range. More preferably, the winding temperature is 350 ° C. or lower.
- the holding time is less than 10 s.
- the upper limit of the holding time is not set, it is preferably 10 minutes or less from the viewpoint of productivity.
- this heat treatment is preferably performed in a specific atmosphere gas.
- the atmospheric gas at this time is important.
- a preferable atmosphere gas is a mixed gas of 3 to 15% by volume of hydrogen, 0.001 to 0.1% by volume of oxygen, 100 to 2000 ppm by volume of CO, and the balance nitrogen, and has a dew point of ⁇ 30 to ⁇ 60. ° C.
- the reason why it is preferable to use the atmospheric gas is as follows.
- hot dip galvanizing is performed, and an appropriate Al concentration in the hot dip zinc bath is 0.1 to 1%.
- An alloying treatment may be performed after hot dip galvanization.
- temper rolling may be performed at an elongation rate of 1.2 to 2.0%. If the elongation rate is less than 1.2%, yield elongation occurs and the surface properties after press molding deteriorate. On the other hand, if the elongation rate exceeds 2.0%, the elongation is significantly deteriorated.
- Example 1 Steel ingots having the steel components and compositions shown in Table 1 were melted and cast. This was heated to 1250 ° C. and hot-rolled to a thickness of 3.6 mm. The final pass outlet temperature in hot rolling was 860 ° C. After cooling at an average cooling rate of 100 to 250 ° C./s, it was wound up at 300 to 350 ° C. Subsequently, cold rolling was performed to obtain a plate thickness of 1.2 mm, followed by heat treatment.
- the conditions for this heat treatment were as follows: hydrogen concentration 10 vol%, oxygen concentration 0.01 vol%, CO concentration 500 vol ppm, the balance being nitrogen, an atmospheric gas with a dew point of ⁇ 50 ° C., an average heating rate of 100 to 150 ° C./s and 750 Heated to ° C. and held for 300 s.
- the hot-dip galvanized steel sheet thus manufactured was evaluated by the following method.
- the average ferrite grain size was measured by a cutting method (JIS G0552-1977) from a 100-fold optical microscope image after mirror-polishing the cross section in the rolling direction and corroding with 3% nital.
- the surface area of the interface between ferrite and cementite was measured by the line segment method after discriminating and separating the ferrite phase and the cementite phase with a scanning electron microscope (SEM) using the above sample.
- the hydrogen in the steel was measured by an inert gas melting-thermal conductivity method (hydrogen analyzer: RH-402, manufactured by LECO) with the plated steel sheet as it is.
- the tensile characteristics of were measured in accordance with JIS Z2241 by collecting JIS No. 5 test piece (JIS Z2201) from the direction perpendicular to the rolling direction.
- the coating bake hardening amount (BH) was measured according to JIS G3135 appendix.
- the blisters were visually observed and observed with a 10-fold magnifier for plating bulge portions having a diameter of 0.1 mm or more present per 1 m 2 of the steel plate surface area, and the number of the blisters was measured.
- Corrosion resistance was evaluated by the following method. Chemical conversion treatment was performed with Nippon Parkerizing Co., Ltd. chemical conversion treatment solution PB-SX35T, and then Cationic electrodeposition paint Powernics 110 manufactured by Nippon Paint Co., Ltd. was applied to a thickness of about 20 ⁇ m. After that, a cross cut was put into the coating film with a cutter, and a composite corrosion test (JASO-M609) determined by the Japan Automobile Engineering Association was performed for 180 cycles (60 days), and the swollen width from the cross cut (maximum swollen width on one side) was measured. . As a result, the swollen width was 5 mm or less, and those exceeding 5 mm were evaluated as x.
- the press formability was evaluated by visual inspection for the presence or absence of cracks and the quality of the surface properties of the press products using a 500 mm square kamaboko punch with a wrinkle holding force of 20 tons and a molding height of 60 mm.
- the steel sheet produced by the method of the present invention is excellent in tensile properties, paint bake hardening amount, blister resistance, and press formability.
- the steel sheet outside the conditions of the present invention is inferior in any of the characteristics.
- the steel plates 1 and 2 have a low C content, a sufficient interface between ferrite and cementite was not generated, and blisters were generated.
- the steel plate 9 has a high C content, cementite is excessively generated, the elongation is lowered, and the press formability is deteriorated.
- steel 10 had a high Mn content, the elongation decreased and the press formability deteriorated.
- steels 11 and 12 had a high Si content or P content, the elongation decreased, the press formability deteriorated, and plating defects occurred. Since steel 14 had a high B content, yield elongation occurred, and stretcher strain occurred in the press formability test.
- Example 2 Using the steel shown in Table 1, a hot-dip galvanized steel sheet having a thickness of 1.2 mm was manufactured under the manufacturing conditions shown in Table 3. The hot-dip galvanized steel sheet thus produced was evaluated in the same manner as in Example 1. The evaluation results are shown in Table 4 (Table 4 and Table 4-2 are combined into Table 4). As is apparent from the results, the steel sheet produced by a suitable method is excellent in tensile properties, paint bake hardening amount, blister resistance, and press formability. On the other hand, it can be said from Tables 3 and 4 that the steel sheet outside the preferred conditions may be inferior in either characteristic.
- the interface between ferrite and cementite was not sufficiently generated, and blisters were generated.
- the steel plate B had a low cooling rate after hot rolling, a sufficient interface between ferrite and cementite was not generated, and blisters were generated.
- the steel sheet C had a high hot rolling coiling temperature, the interface between ferrite and cementite was not sufficiently generated, and blisters were generated.
- the steel sheet F had a high hydrogen concentration in the atmosphere gas for heat treatment and a high hydrogen concentration in the plated steel sheet, blistering occurred.
- the steel plate G had a low oxygen concentration in the atmosphere gas for heat treatment and a high hydrogen concentration in the plated steel plate, blisters were generated.
- Steel sheet I had a low dew point of the atmosphere gas for heat treatment, and the hydrogen concentration in the plated steel sheet was high, so that blisters were generated. Since the steel plate J had a low heat treatment temperature and a small ferrite crystal grain size, the elongation was low and the press formability deteriorated. Since the steel plate K had a high heat treatment temperature and the hydrogen concentration in the plated steel plate was high, blisters were generated. Moreover, since the ferrite crystal grain size was large, rough skin defects occurred in the press formability test. Since the steel sheet O had a large amount of hot dip galvanized coating, blisters were generated. Also, cracks occurred in the press molding test. Steel sheet P had insufficient corrosion resistance due to the small amount of hot dip galvanized adhesion.
Abstract
Description
本発明における下地鋼板は、質量%で、C:0.015~0.100%、Si:0.01~0.30%、Mn:0.1~1.0%、P:0.010~0.070%、S:0.003~0.020%、Sol.Al:0.01~0.10%、N:0.002~0.005%を含有し、残部が鉄および不可避的不純物からなる。また、本発明の下地鋼板は、さらに、B:0.0010~0.0050%を含んでもよい。また、本発明の下地鋼板は、質量%で、さらにTi:0.001~0.1%、Nb:0.001~0.1%、Zr:0.001~0.1%、Cr:0.001~0.1%、Cu:0.001~0.1%、Ni:0.001~0.1%及びV:0.001~0.1%から選択される少なくとも1種を含有してもよい。まず、下地鋼板の化学成分の限定理由について説明する。
Cには、鋼板を強化する効果があり、また、セメンタイトを生成して水素をトラップし、めっきのブリスターを抑制する効果がある。Cの含有量が0.015%未満ではブリスター抑制の効果が十分でない。また、Cの含有量が0.100%を超えると強度が上昇しすぎて、加工性を損なう。したがって、Cの含有量は0.015~0.100%とする。また、Cの含有量によって、焼付け硬化型溶融亜鉛めっき鋼板の強度を調整できるため、所望の強度に応じて、上記範囲内でCの含有量を決定してもよい。
下地鋼板のSiの含有量を0.01%未満とするには脱珪コストが著しく上昇する。Siの含有量が0.30%を超えると、冷延後の焼鈍処理のための加熱保持中にSi酸化物が形成され、溶融亜鉛めっきの付着を阻害する。したがって、Siの含有量は0.01~0.30%とする必要がある。
Mnは、MnSを形成することでSを無害化し、鋼板の加工性を向上すると同時に、鋼板の強化にも寄与する元素である。Mnの含有量が0.1%未満では、MnS形成の効果が十分でない。また、Mnの含有量が1.0%を超えると強度が上昇しすぎて加工性を損なう。したがって、Mnの含有量は0.1~1.0%とする必要がある。また、Mnの含有量によって、焼付け硬化型溶融亜鉛めっき鋼板の強度を調整できるため、所望の強度に応じて、上記範囲内でMnの含有量を決定してもよい。
下地鋼板のPの含有量を0.010%未満とするには脱燐コストが著しく上昇する。Pの含有量が0.070%を超えると、強度が上昇しすぎて加工性を損なう。したがって、Pの含有量は0.010~0.070%とする必要がある。
本発明における下地鋼板では、Sの含有量が0.020%を超えると、成形性劣化や表面欠陥の原因となる。一方、Sの含有量を0.003%未満とするには脱硫コストが著しく上昇する。したがって、Sの含有量を0.003~0.020%とする必要がある。
Alは、脱酸のために使用される。Sol.Alの含有量が0.01%未満では、その効果が十分でなく表面欠陥の発生リスクを高める。一方、Sol.Alの含有量が0.10%を超えると脱酸の効果が飽和し、不経済となる。したがって、Sol.Alの含有量は、0.01~0.10%とする。
本発明における下地鋼板では、不純物としてNを含有する場合が多い。Nの含有量が0.005%超えになると成形性劣化や表面欠陥の原因となる。一方、Nの含有量を0.002%未満とするには脱窒コストが著しく上昇する。したがって、Nの含有量は0.002~0.005%とする必要がある。
本発明における下地鋼板に含まれる必須成分は上記の通りであり、残部は鉄と、鋼原料もしくはその製造工程で混入し得る不可避不純物元素よりなる。
Bは、固溶Nと結合して粗大なBNを生成し、Nを無害化させる効果があり、必要に応じて添加される。Bの含有量が0.0010%未満では、上記効果が十分でない。0.0050%を超えると、時効性を過度に上昇させ、ストレッチャーストレインを発生させやすくなる。Bを添加する場合、Bの含有量は0.0010~0.0050%が好ましい。
下地鋼板がTiを含むと、Tiは固溶Nと結合してTiNを生成する。このようにTiは、Nを無害化する効果を有する。Tiの含有量が0.001%未満では、上記効果が十分でない。Tiの含有量が0.1%を超えるとTiCを過剰に形成して、伸びが劣化する場合がある。したがって、Tiを含有する場合、Tiの含有量は0.001~0.1%であることが好ましい。
下地鋼板がNbを含むと、NbCの析出による析出強化の効果がある。Nbの含有量が0.001%未満では、上記効果が十分でない。Nbの含有量が0.1%を超えるとNbCが過剰に生成して、伸びが劣化する場合がある。したがって、Nbを含有する場合、Nbの含有量は0.001~0.1%であることが好ましい。
Zrを含むとZrCの析出による析出強化の効果がある。Zrの含有量が0.001%未満では、上記効果が十分でない。Zrの含有量が0.1%を超えるとZrCが過剰に生成して、伸びが劣化する場合がある。したがって、Zrを含有する場合、Zrの含有量は0.001~0.1%であることが好ましい。
Crを含むと固溶強化の効果がある。Crの含有量が0.001%未満では、上記効果が十分でない。Crの含有量が0.1%を超えると、伸びが劣化する場合がある。したがって、Crを含有する場合、Crの含有量は0.001~0.1%であることが好ましい。
Cuを含むと固溶強化の効果がある。Cuの含有量が0.001%未満では、上記効果が十分でない。Cuの含有量が0.1%を超えると、伸びが劣化する場合がある。したがって、Cuを含有する場合、Cuの含有量は0.001~0.1%であることが好ましい。
Niを含むと固溶強化の効果がある。Niの含有量が0.001%未満では、上記効果が十分でない。Niの含有量が0.1%を超えると、伸びが劣化する場合がある。したがって、Niを含有する場合、Niの含有量は0.001~0.1%であることが好ましい。
Vを含むとVCの析出による析出強化の効果がある。Vの含有量が0.001%未満では、上記効果が十分でない。Vの含有量が0.1%を超えるとVCが過剰に生成して、伸びが劣化する場合がある。したがって、Vを含有する場合、Vの含有量は0.001~0.1%であることが好ましい。
フェライト相は強度と加工性を高める効果があり、セメンタイト相は水素トラップによりブリスター発生抑制の効果がある。パーライト相はフェライト相とセメンタイト相の層状組織であるので、フェライト相とセメンタイト相から構成されるものである。また、ベイナイト、マルテンサイトなどの低温変態相は、加工性の観点から極力発生させない方が望ましい。低温変態相の含有量がそれぞれ5体積%以下であれば影響が少ないので、これらの相を含んでもよい。その他に、含有金属元素の炭化物、窒化物、硫化物がそれぞれの元素含有量に応じて含まれてもよい。なお、金属組織がフェライト相とセメンタイト相から構成されることは、実施例に記載の方法で確認することができる。
フェライト平均粒径が10μm未満では加工性が劣化する。また、フェライト平均粒径が30μmを超えると、プレス加工などにより変形しやすくなり、結晶粒ごとの変形量の差異に起因した鋼板表面の凹凸が発生し、成形品の美観を損なう。したがって、フェライト平均粒径は10~30μmとする必要がある。なお、フェライト平均粒径とは、実施例に記載の方法で測定して得られるフェライト平均粒径である。
単位体積あたりのフェライトとセメンタイトの界面の表面積を1.0~10.0/mmに制御することにより、溶融亜鉛めっきのブリスター発生を抑制できる。当該表面積が1.0/mm未満ではこの効果が十分でなく、10.0/mmを超えると鋼板の局部延性が低下し、加工性が劣化する。
水素は、冷間圧延後の熱処理工程で雰囲気ガスから侵入し、めっき処理のときに鋼板中に封入され、めっき後のブリスター発生の原因となる。したがって、鋼板中の水素濃度はめっき後に評価することが必要である。その値が0.1ppm以上では、金属組織を適正に制御してもブリスターの発生抑制が困難である。そのため、鋼中水素濃度は0.1ppm未満でなければならない。
めっき層には、Znを主体として含む亜鉛めっき層以外に、合金化反応によって亜鉛めっき中に鋼中のFeが拡散しできたFe-Zn合金を主体として含む合金化亜鉛めっき層を含む。
めっき層の亜鉛付着量は鋼板表面積に対し40~100g/m2である。亜鉛付着量が上記の範囲にあれば、自動車外板用途をはじめとする加工用鋼板に対して、必要な耐食性と加工性、また、耐ブリスター性を付与できる。より具体的には、亜鉛付着量が40g/m2未満では、十分な耐食性が得られない。また、亜鉛付着量が100g/m2を超えるとめっき鋼板の表面摩擦係数が上昇して、加工性が劣化する。また、めっき層による鋼板中の水素の封じ込め効果が増し、ブリスターが発生しやすくなる。したがって、めっき層の亜鉛付着量が鋼板表面積に対し40~100g/m2である必要がある。
本発明の焼付け硬化型溶融亜鉛めっき鋼板の製造方法について、好ましい方法、条件について説明する。
表1に示す鋼成分、組成を有する鋼塊を溶解、鋳造した。これを1250℃に加熱し、板厚3.6mmまで熱間圧延した。熱間圧延における最終パス出側温度は860℃であった。100~250℃/sの平均冷却速度で冷却後、300~350℃で巻き取った。続いて冷間圧延を行い、板厚1.2mmとし、さらに熱処理を実施した。この熱処理の条件は、水素濃度10体積%、酸素濃度0.01体積%、CO濃度500体積ppm、残部が窒素、露点-50℃の雰囲気ガス、平均加熱速度は100~150℃/sで750℃に加熱、300s保持とした。
表1に示す鋼を用いて、表3に示す製造条件で板厚1.2mmの溶融亜鉛めっき鋼板を製造した。こうして製造した溶融亜鉛めっき鋼板を実施例1と同様の方法で評価を行った。表4(表4-1と表4-2を合わせて表4とする。)に評価結果を示す。本結果より明らかなように、好適な方法により製造した鋼板は引張特性、塗装焼付け硬化量、耐ブリスター性、プレス成形性においていずれも優れる。一方、表3及び4から、好適条件外の鋼板はいずれかの特性が劣る場合があるといえる。例えば、鋼板Aは鋼成分が本発明範囲から外れるため、フェライトとセメンタイトの界面が十分に生成せず、ブリスターが発生した。鋼板Bは熱間圧延後の冷却速度が低いため、フェライトとセメンタイトの界面が十分に生成せず、ブリスターが発生した。鋼板Cは熱延巻き取り温度が高いため、フェライトとセメンタイトの界面が十分に生成せず、ブリスターが発生した。鋼板Fは熱処理の雰囲気ガス中の水素濃度が高く、めっき鋼板中の水素濃度が高いため、ブリスターが発生した。鋼板Gは熱処理の雰囲気ガス中の酸素濃度が低く、めっき鋼板中の水素濃度が高いため、ブリスターが発生した。鋼板Iは熱処理の雰囲気ガスの露点が低く、めっき鋼板中の水素濃度が高いため、ブリスターが発生した。鋼板Jは熱処理温度が低く、フェライト結晶粒径が小さいため、伸びが低く、プレス成形性が劣化した。鋼板Kは熱処理温度が高く、めっき鋼板中の水素濃度が高いため、ブリスターが発生した。また、フェライト結晶粒径が大きいため、プレス成形性試験において肌荒れ欠陥が発生した。鋼板Oは溶融亜鉛めっきの付着量が多いため、ブリスターが発生した。また、プレス成形試験においても割れが発生した。鋼板Pは溶融亜鉛めっきの付着量が少ないため、耐食性が不十分であった。
Claims (3)
- 下地鋼板と、該下地鋼板上に形成されるめっき層とを有する焼付け硬化型溶融亜鉛めっき鋼板であって、
前記下地鋼板は、質量%で、C:0.015~0.100%、Si:0.01~0.30%、Mn:0.1~1.0%、P:0.010~0.070%、S:0.003~0.020%、Sol.Al:0.01~0.10%、N:0.002~0.005%を含有し、残部が鉄および不可避的不純物からなり、
前記下地鋼板の金属組織は、フェライト相とセメンタイト相から構成され、フェライト平均粒径が10~30μmであり、単位体積あたりのフェライトとセメンタイトの界面の表面積が1.0~10.0/mmであり、
前記下地鋼板の鋼中水素濃度が0.1ppm未満であり、
前記めっき層の亜鉛付着量が鋼板表面積に対し40~100g/m2であることを特徴とする、焼付け硬化型溶融亜鉛めっき鋼板。 - 前記下地鋼板は、質量%で、さらにB:0.0010~0.0050%を含有することを特徴とする請求項1に記載の焼付け硬化型溶融亜鉛めっき鋼板。
- 前記下地鋼板は、質量%で、さらにTi:0.001~0.1%、Nb:0.001~0.1%、Zr:0.001~0.1%、Cr:0.001~0.1%、Cu:0.001~0.1%、Ni:0.001~0.1%及びV:0.001~0.1%から選択される少なくとも1種を含有することを特徴とする請求項1又は2に記載の焼付け硬化型溶融亜鉛めっき鋼板。
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