WO2016113789A1 - 高強度溶融亜鉛めっき鋼板およびその製造方法 - Google Patents
高強度溶融亜鉛めっき鋼板およびその製造方法 Download PDFInfo
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- WO2016113789A1 WO2016113789A1 PCT/JP2015/005821 JP2015005821W WO2016113789A1 WO 2016113789 A1 WO2016113789 A1 WO 2016113789A1 JP 2015005821 W JP2015005821 W JP 2015005821W WO 2016113789 A1 WO2016113789 A1 WO 2016113789A1
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- less
- steel sheet
- temperature
- dip galvanized
- phase
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- C23C2/36—Elongated material
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- 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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- 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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- 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
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- 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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- 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
- 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
- C21D2211/001—Austenite
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
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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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
- Y10T428/12736—Al-base component
- Y10T428/1275—Next to Group VIII or IB metal-base component
- Y10T428/12757—Fe
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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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
- Y10T428/12771—Transition metal-base component
- Y10T428/12785—Group IIB metal-base component
- Y10T428/12792—Zn-base component
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
- Y10T428/12771—Transition metal-base component
- Y10T428/12861—Group VIII or IB metal-base component
- Y10T428/12951—Fe-base component
-
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
- Y10T428/12771—Transition metal-base component
- Y10T428/12861—Group VIII or IB metal-base component
- Y10T428/12951—Fe-base component
- Y10T428/12958—Next to Fe-base component
-
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
- Y10T428/12771—Transition metal-base component
- Y10T428/12861—Group VIII or IB metal-base component
- Y10T428/12951—Fe-base component
- Y10T428/12972—Containing 0.01-1.7% carbon [i.e., steel]
Definitions
- the present invention relates to a high-strength hot-dip galvanized steel sheet and a method for producing the same.
- the high-strength hot-dip galvanized steel sheet of the present invention is suitable for use as a steel sheet for automobiles.
- Patent Document 1 discloses a high-strength hot-dip galvanized steel sheet excellent in bending workability by controlling precipitates, and a technology for controlling a cooling rate before solidification of molten steel, an annealing temperature in annealing, and a subsequent cooling rate as a manufacturing method thereof. It is disclosed.
- Patent Document 2 discloses a high-strength hot-dip galvanized steel sheet excellent in ductility and bendability by controlling the balance of Si and Al, residual ⁇ and Vickers hardness just below the surface, and the manufacturing method of finishing temperature and winding temperature.
- a technique for controlling the annealing temperature range, the cooling rate after annealing, the cooling stop temperature, and the cooling stop holding time is disclosed.
- precipitation strengthened steel has high yield strength (YS), but is not excellent in uniform elongation (UEL), and there is no knowledge in a region where TS is 1180 MPa or more. Furthermore, there is no knowledge to improve the material by performing annealing multiple times.
- the tensile strength is as low as less than 900 MPa, and there is room for improvement. In addition, there is no knowledge to improve the material by performing annealing multiple times.
- TS It is an object to be solved by the present invention to provide a high-strength hot-dip galvanized steel sheet having a high YS of 1180 MPa or more and excellent in uniform elongation and bendability and a method for producing the same.
- C 0.15% to 0.25%
- Si 0.50% to 2.5%
- Mn 2.3% to 4.0%
- Al 0.01% or more 2.5% or less
- hot rolling, cold rolling and annealing are performed under appropriate conditions, and in terms of area ratio, tempered martensite phase: 30% to 73%, ferrite phase: 25% to 68%, retained austenite Phase: 2% or more and 20% or less, other phase: 10% or less (including 0%), and martensite phase: 3% or less (including 0%) as the other phase, bainitic ferrite
- the phase less than 5% (including 0%)
- the average crystal grain size of the tempered martensite phase is 8 ⁇ m or less
- the amount of C in the residual austenite phase is less than 0.7% by mass
- TS is 1180 MPa or more
- YS is 850 MPa or more
- uniform Beauty can achieve 7.0% or more and excellent bendability.
- the present invention has been made on the basis of such knowledge, and the gist thereof is as follows.
- the component composition further contains at least one element selected from Ca: 0.001% to 0.005% and REM: 0.001% to 0.005% in mass% [1] ] To the high-strength hot-dip galvanized steel sheet according to any one of [3].
- the slab having the component composition according to any one of [1] to [4] is set to a temperature of 1100 ° C. or higher, hot-rolled at a finish rolling temperature of 800 ° C. or higher to produce a hot-rolled steel sheet, and 550 ° C. or lower.
- the galvanizing step includes galvanizing, further performing a plating alloying treatment in which a temperature range of 460 ° C. to 580 ° C. is maintained for 1 second to 120 seconds, and then cooling to room temperature [7] ]
- the “high-strength hot-dip galvanized steel sheet” is a steel sheet having a tensile strength of 1180 MPa or more, and includes not only hot-dip galvanized steel sheets but also galvannealed steel sheets.
- “Hot galvanizing” includes not only hot dip galvanizing but also galvannealed alloying. In addition, when it is necessary to distinguish between a hot-dip galvanized steel sheet and an alloyed hot-dip galvanized steel sheet, these steel sheets are described separately.
- TS 1180 MPa or more, high YS of 850 MPa or more, uniform elongation of 7.0% or more, and excellent bending with a crack of 0.5 mm or less when bent at a bending radius of 2.0 mm
- a high-strength hot-dip galvanized steel sheet having properties can be obtained.
- the high-strength hot-dip galvanized steel sheet is suitable as a material for automobile parts.
- Component composition C 0.15% or more and 0.25% or less C is an element necessary for increasing TS by generating a martensite phase or increasing the hardness of the martensite phase. . Further, it is an element necessary for stabilizing the retained austenite phase and obtaining uniform elongation. If the amount of C is less than 0.15%, the strength of the martensite phase is low and the residual austenite phase is not sufficiently stabilized, so it is difficult to achieve both TS of 1180 MPa or more and uniform elongation of 7.0% or more. is there. On the other hand, when the amount of C exceeds 0.25%, the deterioration of bendability becomes remarkable. Therefore, the C content is 0.15% or more and 0.25% or less. Regarding the content, the lower limit side is preferably 0.16% or more. The upper limit side is preferably 0.22% or less.
- Si 0.50% or more and 2.5% or less
- Si is an element effective for increasing TS by solid solution strengthening of steel. Further, it is an effective element for obtaining a retained austenite phase by suppressing the formation of cementite. In order to obtain such an effect, the Si amount needs to be 0.50% or more.
- the Si content is 0.50% or more and 2.5% or less. Preferably it is 0.50% or more and 2.0% or less, more preferably 0.50% or more and 1.8% or less.
- Mn 2.3% or more and 4.0% or less
- Mn is an element that raises TS by solid solution strengthening of steel, suppresses ferrite transformation and bainite transformation, generates martensite phase, and raises TS. is there. Moreover, it is an element which stabilizes an austenite phase and improves uniform elongation. In order to sufficiently obtain such an effect, the Mn content needs to be 2.3% or more. On the other hand, if the amount of Mn exceeds 4.0%, the increase of inclusions becomes remarkable, causing deterioration of bendability. Therefore, the amount of Mn is set to 2.3% to 4.0%. Preferably they are 2.3% or more and 3.8% or less, More preferably, they are 2.3% or more and 3.5% or less.
- P 0.100% or less P is desirably reduced as much as possible because P degrades bendability and weldability due to grain boundary segregation.
- the upper limit of the amount of P is 0.100%.
- P amount is preferably 0.050% or less, and more preferably 0.020% or less.
- the lower limit is not particularly defined, but if it is less than 0.001%, the production efficiency is lowered, so 0.001% or more is preferable.
- S 0.02% or less S is present as inclusions such as MnS, and deteriorates weldability. Therefore, the amount is preferably reduced as much as possible.
- the upper limit of the amount of S is acceptable up to 0.02%.
- the S amount is preferably 0.0040% or less.
- the lower limit is not particularly specified, but if it is less than 0.0005%, the production efficiency is lowered, so 0.0005% or more is preferable.
- Al 0.01% or more and 2.5% or less
- Al is an element effective for stabilizing the austenite phase and obtaining a retained austenite phase. If the Al content is less than 0.01%, the austenite phase cannot be stabilized and a residual austenite phase cannot be obtained. On the other hand, if the Al content exceeds 2.5%, not only the risk of slab cracking during continuous casting increases, but also the ferrite phase is excessively formed during annealing, making it difficult to achieve both TS: 1180 MPa and bendability. . Therefore, the Al content is 0.01% or more and 2.5% or less. From the viewpoint of suppressing excessive formation of the ferrite phase, it is preferably 0.01% to 1.0%, more preferably 0.01% to 0.6%.
- the balance is Fe and inevitable impurities, but one or more of the following elements can be appropriately contained as necessary.
- At least one element selected from Cr: 0.01% to 2.0%, Ni: 0.01% to 2.0%, Cu: 0.01% to 2.0%, Cr, Ni, Cu Is an element effective in increasing the strength by generating a low-temperature transformation phase such as martensite phase.
- the content of at least one element selected from Cr, Ni, and Cu is set to 0.01% or more.
- the respective contents of Cr, Ni and Cu exceed 2.0%, the effect is saturated. Therefore, when these elements are contained, the contents of Cr, Ni, and Cu are 0.01% or more and 2.0% or less, respectively.
- the lower limit is preferably 0.1% or more.
- the upper limit side is preferably 1.0% or less.
- B 0.0002% or more and 0.0050% or less B is an element effective to segregate at the grain boundary, suppress the formation of ferrite phase and bainite phase, and promote the formation of martensite phase.
- the B content needs to be 0.0002% or more.
- the amount of B exceeds 0.0050%, the effect is saturated and the cost is increased. Therefore, when it contains B, the amount of B shall be 0.0002% or more and 0.0050% or less.
- the lower limit of the content is preferably 0.0005% or more.
- the upper limit side is preferably 0.0030% or less, more preferably 0.0020% or less.
- At least one element selected from Ca: 0.001% or more and 0.005% or less, REM: 0.001% or more and 0.005% or less improves formability by controlling the form of sulfides. It is an effective element.
- the content of at least one element selected from Ca and REM is set to 0.001% or more.
- the respective contents of Ca and REM exceed 0.005%, the cleanliness of the steel may be adversely affected and the properties may be reduced. Therefore, when it contains these elements, content of Ca and REM shall be 0.001% or more and 0.005% or less.
- the area ratio of the tempered martensite phase is 30% or more and 73% or less.
- the lower limit side is preferably 40% or more.
- the upper limit side is preferably 70% or less, and more preferably 65% or less.
- the area ratio of the ferrite phase is 25% or more and 68% or less. If the area ratio of the ferrite phase is less than 25%, the uniform elongation of the present invention cannot be obtained. On the other hand, if it exceeds 68%, YS of the present invention cannot be obtained. Therefore, the area ratio of the ferrite phase is 25% or more and 68% or less.
- the lower limit side is preferably 35% or more.
- the upper limit side is preferably 60% or less. In the present invention, an unrecrystallized ferrite phase that is not preferable for ductility and bendability is not included in the ferrite phase.
- the area ratio of retained austenite phase 2% or more and 20% or less If the area ratio of the retained austenite phase is less than 2%, it is difficult to achieve both high strength of TS: 1180 MPa and uniform elongation of 7.0%. On the other hand, if it exceeds 20%, the bendability deteriorates. Therefore, the area ratio of the retained austenite phase is 2% or more and 20% or less. Regarding the area ratio, the lower limit side is preferably 3% or more. The upper limit side is preferably 15% or less.
- the steel sheet structure of the present invention may consist of three phases, a tempered martensite phase, a ferrite phase and a retained austenite phase. Further, if the area ratio is 10% or less, other phases are acceptable. Since the other phase is not preferable in terms of bendability and TS, the area ratio is set to 10% or less. Preferably it is less than 5%, more preferably less than 3%. Examples of the other phases include a martensite phase, bainitic ferrite phase, pearlite phase, and non-recrystallized ferrite phase.
- the martensite phase and bainitic ferrite phase further define an allowable area ratio for the following reasons.
- Martensite area ratio 3% or less (including 0%)
- the area ratio of the martensite phase exceeds 3%, the deterioration of bendability becomes remarkable. Therefore, the area ratio of martensite is 3% or less. Preferably it is 2% or less, More preferably, it is 1% or less.
- Area ratio of bainitic ferrite phase less than 5% (including 0%) If the area ratio of the bainitic ferrite phase is 5% or more, it is difficult to achieve both high strength of TS: 1180 MPa and uniform elongation of 7.0% or more. Therefore, the area ratio of the bainitic ferrite phase is less than 5%.
- Average crystal grain size of tempered martensite phase 8 ⁇ m or less
- the average crystal grain size of tempered martensite is 8 ⁇ m or less.
- the average crystal grain size is preferably 4 ⁇ m or less.
- the crystal grains of the tempered martensite phase are crystal grains of the tempered martensite phase surrounded by the prior austenite phase grain boundaries and grain boundaries between the tempered martensite phase and other phases such as ferrite phase and bainitic ferrite phase. is there.
- C content in residual austenite phase less than 0.7% by mass
- TS high strength of 1180 MPa or more and uniform elongation. Coexistence of 0% or more becomes difficult. Therefore, the amount of C in the retained austenite phase is less than 0.7% by mass. Preferably it is 0.6 mass% or less. In the present invention, the amount of C in the retained austenite phase is a value determined from X-ray diffraction.
- the area ratio of martensite phase, tempered martensite phase, ferrite phase, bainitic ferrite phase, pearlite phase, non-recrystallized ferrite phase is the ratio of the area of each phase in the observed area.
- These area ratios are obtained by cutting a sample from the steel sheet after the final manufacturing process, polishing the cross section parallel to the rolling direction, corroding with 3% nital, and locating the thickness 1/4 position in the steel sheet under the galvanized layer. Three fields of view were taken with a scanning electron microscope (SEM) at a magnification of 1500 times, and the area ratio of each phase was obtained from the obtained image data using Image-Pro made by Media Cybernetics, and the average area ratio of the field of view was calculated.
- SEM scanning electron microscope
- the ferrite phase is black
- the martensite phase is white without carbide
- the tempered martensite phase is gray with carbide
- the bainitic ferrite phase is dark gray with carbide or island martensite phase
- the pearlite phase Can be distinguished as black and white layers.
- the non-recrystallized ferrite phase is distinguished from the ferrite phase as a black color including subgrain boundaries.
- the island martensite phase is a tempered martensite phase
- the island martensite phase is determined as an tempered martensite phase.
- the average crystal grain size of the tempered martensite phase is obtained by dividing the total area of the tempered martensite phase of the visual field by the number of the tempered martensite phases to obtain the average area of the image data obtained by calculating the area ratio. The square was taken as the average particle size.
- the area ratio of the residual austenite phase was ground by chemical polishing so that the steel plate after the final production process was ground so that the 1/4 position of the thickness of the steel plate under the galvanized layer was the measurement surface.
- the 1/4 position plane of the plate thickness using the K ⁇ ray of Mo with an X-ray diffractometer, the (200) plane, (220) plane, (311) plane of fcc iron (austenite phase), and bcc iron (ferrite phase) ) Of (200) plane, (211) plane, and (220) plane are measured, and the integral reflection intensity from each surface of bcc iron (ferrite phase) is integrated from each surface of fcc iron (austenite phase).
- the volume ratio is obtained from the intensity ratio of the reflection intensity, and the volume ratio value is defined as the area ratio value.
- the amount of C in the retained austenite phase is calculated from the shift amount of the diffraction peak on the (220) plane by the following formula using Co K ⁇ rays with an X-ray diffractometer.
- a is the lattice constant ( ⁇ ) of austenite
- ⁇ is a value (rad) obtained by dividing the diffraction peak angle of the (220) plane by 2
- [M] is mass% of the element M in the austenite (elements not contained are 0).
- the mass% of the element M in the retained austenite phase is the mass% of the entire steel.
- the use of the high-strength hot-dip galvanized steel plate of the present invention is not particularly limited, but is preferably used for automobile parts.
- the plate thickness (not including the plating layer) of the high-strength hot-dip galvanized steel sheet of the present invention is not particularly limited, but is preferably 0.4 mm or more and 3.0 mm or less.
- the high-strength hot-dip galvanized steel sheet of the present invention is, for example, a slab having the above component composition at a temperature of 1100 ° C. or higher, hot-rolled at a finish rolling temperature of 800 ° C. or higher to manufacture a hot-rolled steel sheet, Up to a hot rolling step of winding at a winding temperature of 550 ° C. or lower, a cold rolling step of cold rolling at a cumulative rolling reduction of more than 20% to produce a cold rolled steel sheet, and an annealing temperature of 800 ° C. or higher and 1000 ° C. or lower.
- Hot rolling process slab temperature When the slab temperature is 1100 ° C. or higher and lower than 1100 ° C., the carbide remains undissolved and the steel sheet structure of the present invention cannot be obtained. Therefore, the slab heating temperature is 1100 ° C. or higher. In order to prevent an increase in scale loss, the heating temperature of the slab is preferably 1300 ° C. or lower.
- the temperature of the material to be rolled such as slab is defined as the surface temperature at the center of the width and the center of the length of the material to be rolled such as slab.
- the slab is preferably produced by a continuous casting method in order to prevent macro segregation, but can also be produced by an ingot-making method or a thin slab casting method.
- To hot-roll the slab the slab may be cooled to room temperature and then re-heated for hot rolling, or the slab may be charged in a heating furnace without being cooled to room temperature. Can also be done.
- an energy saving process in which hot rolling is performed immediately after performing a slight heat retention can also be applied.
- Finishing rolling temperature 800 ° C. or more
- the finish rolling temperature is 800 ° C. or higher.
- the upper limit of the finish rolling temperature is not particularly limited, and is preferably 950 ° C. or lower.
- the rough bar after rough rolling can be heated from the viewpoint of preventing troubles during rolling even if the heating temperature of the slab is lowered.
- a continuous rolling process which joins rough bars and performs finish rolling continuously can be applied.
- finish rolling may increase anisotropy and reduce workability after cold rolling and annealing, it is preferably performed at a finishing temperature equal to or higher than the Ar 3 transformation point.
- Winding temperature 550 ° C. or less
- a soft phase such as a ferrite phase or a pearlite phase
- the winding temperature is set to 550 ° C. or lower.
- the lower limit is not particularly specified, but if it is less than 400 ° C., the plate shape deteriorates, so 400 ° C. or higher is preferable.
- the steel sheet after winding is subjected to cold rolling, pre-annealing, main annealing, hot dip galvanizing, tempering and the like under the above conditions after removing the scale by pickling.
- a structure is formed by a preliminary annealing process, a main annealing process, and a tempering process.
- the pre-annealing step after an austenite phase is formed, cooling is performed so as to suppress soft structures such as a ferrite phase and a pearlite phase, and a hard structure including a bainite phase and a martensite phase is formed.
- the main annealing step an austenite phase is finely generated on the basis of the hard structure by controlling the rate of temperature rise and annealing temperature. Further, the bainite phase is suppressed by cooling and holding control to form a residual austenite phase and a martensite phase with less C.
- the martensite phase is tempered to form a tempered martensite phase.
- annealing temperature 800 ° C. or higher and 1000 ° C. or lower If the annealing temperature in the pre-annealing step is lower than 800 ° C., the austenite phase is not sufficiently generated, and the steel sheet structure of the present invention cannot be obtained. On the other hand, if it exceeds 1000 ° C., the austenite grains become coarse and the steel sheet structure of the present invention cannot be obtained. Therefore, the annealing temperature in the preliminary annealing step is set to 800 ° C. or higher and 1000 ° C. or lower. Preferably they are 800 degreeC or more and 930 degrees C or less.
- the annealing holding time of the pre-annealing holding for 10 seconds or more at the annealing temperature is less than 10 seconds, austenite is not sufficiently generated, and the steel sheet structure of the present invention cannot be obtained. Therefore, the annealing holding time in the preliminary annealing step is 10 seconds or more.
- the annealing holding time for preliminary annealing is not particularly limited, and is preferably 500 seconds or less.
- Average cooling rate 5 ° C./s or more If the average cooling rate from the annealing temperature to 550 ° C. is less than 5 ° C./s, a ferrite phase or a pearlite phase is generated during cooling, and the steel sheet structure of the present invention cannot be obtained. Therefore, the average cooling rate up to 550 ° C. is set to 5 ° C./s or more. Preferably it is 8 degrees C / s or more.
- “s” in the unit of average heating rate and average cooling rate means “second”.
- Cooling stop temperature 550 ° C. or less
- the cooling stop temperature at an average cooling rate of 5 ° C./s or more exceeds 550 ° C., a large amount of ferrite phase or pearlite phase is generated, and the steel sheet structure of the present invention cannot be obtained. Therefore, the cooling stop temperature at an average cooling rate of 5 ° C./s or higher is set to 550 ° C. or lower.
- the cooling rate in the range below 550 degreeC is not specifically limited, It is good also as less than 5 degreeC / s.
- the lower limit of the cooling stop temperature can be adjusted as appropriate, and is preferably 0 ° C. or higher.
- reheating may be performed after cooling in the preliminary annealing step.
- the reheating temperature is preferably 50 to 550 ° C. from the viewpoint of suppressing the ferrite phase and the pearlite phase. From the viewpoint of suppressing the ferrite phase and pearlite phase, the holding time at the reheating temperature is preferably 1 to 1000 seconds. After preliminary annealing, cool to 50 ° C or lower.
- an average heating rate shall be 10 degrees C / s or less.
- the average heating rate is a value obtained by dividing the temperature difference between the annealing temperature and 200 ° C. by the heating time from 200 ° C. to the annealing temperature.
- the annealing temperature is 680 ° C. or higher and 790 ° C. or lower and the annealing temperature is lower than 680 ° C.
- the austenite phase is not sufficiently generated, and the steel sheet structure of the present invention cannot be obtained.
- the annealing temperature is set to 680 ° C. or higher and 790 ° C. or lower. Preferably they are 700 degreeC or more and 790 degrees C or less.
- the annealing holding time is 30 to 1000 seconds.
- the lower limit side is preferably 60 seconds or longer.
- the upper limit side is preferably 600 seconds or less.
- the average cooling rate from the annealing temperature to the cooling stop temperature is less than 1.0 ° C./s when the average cooling rate is 1.0 ° C./s or more, a large amount of ferrite phase, pearlite phase, or bainite phase is generated during cooling. Steel sheet structure cannot be obtained. Therefore, the average cooling rate is set to 1.0 ° C./s or more.
- the upper limit of the average cooling rate is not particularly limited and can be adjusted as appropriate. Preferably, it is 100 degrees C / s or less.
- Cooling stop temperature 460 ° C. or more and 550 ° C. or less
- the cooling stop temperature at an average cooling rate of 1.0 ° C./s or more is less than 460 ° C.
- a large amount of bainite phase is generated, and the steel sheet structure of the present invention cannot be obtained.
- the cooling stop temperature is set to 460 ° C. or more and 550 ° C. or less.
- Cooling stop holding time 500 seconds or less
- the cooling stop holding time exceeds 500 seconds, a large amount of bainite and pearlite are generated, and the steel sheet structure of the present invention cannot be obtained. Therefore, the cooling stop holding time is set to 500 seconds or less.
- the lower limit of the cooling stop holding time is not particularly limited, can be appropriately adjusted, and may not be held.
- the cooling stop holding time means the time from after cooling to 550 ° C. or lower after annealing to immersion in the galvanizing bath, and it is not necessary to hold the temperature at the cooling stop strictly after the cooling stop, If it exists in the temperature range of 460 degreeC or more and 550 degrees C or less, it can cool or raise temperature.
- the plating treatment is preferably performed by immersing the steel plate obtained as described above in a zinc plating bath at 440 ° C. or higher and 500 ° C. or lower, and then adjusting the plating adhesion amount by gas wiping or the like. . Further, when alloying the galvanizing, it is preferable to keep the alloy in the temperature range of 460 ° C. to 580 ° C. for 1 second to 120 seconds. For the galvanization, it is preferable to use a galvanizing bath having an Al content of 0.08% by mass or more and 0.25% by mass or less.
- the steel sheet after galvanization can be subjected to various coating treatments such as resin and oil coating.
- Tempering Step Tempering temperature: 50 ° C. or higher and 400 ° C. or lower If the tempering temperature is lower than 50 ° C., the tempering of the martensite phase becomes insufficient and the steel sheet structure of the present invention cannot be obtained. On the other hand, if it exceeds 400 ° C., the austenite phase is decomposed and the steel sheet structure of the present invention cannot be obtained. Therefore, the tempering temperature is set to 50 ° C. or more and 400 ° C. or less. Regarding the tempering temperature, the lower limit is preferably 100 ° C. or higher. The upper limit side is preferably 350 ° C. or lower.
- the tempering treatment either a continuous annealing furnace or a box-type annealing furnace may be used.
- the tempering time is preferably 24 hours or less from the viewpoint of suppressing adhesion.
- Elongation ratio of temper rolling process 0.05% or more and 1.00% or less
- This temper rolling increases YS.
- the elongation rate should be 0.05% or more.
- the uniform elongation may decrease. Therefore, when performing a temper rolling process, the elongation rate of temper rolling shall be 0.05% or more and 1.00% or less.
- Table 2-1 and Table 2-2 are referred to as Table 2.
- Steel having the composition shown in Table 1 was melted in a vacuum melting furnace and rolled into a steel slab. These steel slabs were heated under the conditions shown in Table 2 and then subjected to rough rolling, finish rolling and cooling, and a winding equivalent treatment was performed to obtain hot rolled steel sheets. Subsequently, it cold-rolled to 1.4 mm, produced the cold-rolled steel plate, and used for pre-annealing and this annealing. Thereafter, a plating treatment was performed (using a zinc plating bath having an Al content of 0.08% by mass or more and 0.25% by mass or less), and cooling to room temperature was performed.
- temper rolling was performed before and / or after the tempering treatment. Under the conditions as described above, the steel plate No. 1 to 37 were produced. Annealing was performed under the conditions shown in Table 2 in a laboratory simulating a continuous hot dip galvanizing line, and hot dip galvanized steel sheets (GI) and galvannealed steel sheets (GA) were produced. The hot-dip galvanized steel sheet is immersed in a plating bath at 460 ° C. to form a plating layer with an adhesion amount of 35 to 45 g / m 2 . It produced by processing. About the obtained plated steel plate, tensile properties and bendability were determined according to the following test methods. The results are shown in Table 3.
- JIS No. 5 tensile test piece (JIS Z 2201) is taken from the steel plate after the final manufacturing process in the direction perpendicular to the rolling direction, and the tensile test conforming to the provisions of JIS Z 2241 with a strain rate of 10 ⁇ 3 / s.
- TS, YS, and UEL were obtained.
- TS was 1180 MPa or more
- YS was 850 MPa or more
- UEL was 7.0% or more.
- ⁇ Bendability test> From the annealed plate, strip-shaped test pieces having a width of 35 mm and a length of 100 mm with the direction parallel to the rolling direction as the bending test axis direction were sampled and subjected to a bending test. A 90 ° V bending test was performed at a stroke speed of 10 mm / s, an indentation load of 10 ton, a pressing holding time of 5 seconds, a bending radius R of 2.0 mm, and the ridgeline portion of the bending apex was observed with a 10 ⁇ magnifier. A case where a crack of 0.5 mm or more was observed at one position was judged as poor, and a crack of less than 0.5 mm was judged as excellent.
- All examples of the present invention are high-strength hot-dip galvanized steel sheets having TS of 1180 MPa or more, YS of 850 MPa or more, uniform elongation of 7.0% or more, and excellent bendability.
- the desired TS is not obtained, the desired YS is not obtained, the desired uniform elongation is not obtained, or the desired bendability is obtained. It is not done.
- the present invention it is possible to obtain a high-strength hot-dip galvanized steel sheet having excellent bendability with TS of 1180 MPa or more, YS of 850 MPa or more, uniform elongation of 7.0% or more.
- TS 1180 MPa or more
- YS 850 MPa or more
- uniform elongation of 7.0% or more When the high-strength hot-dip galvanized steel sheet of the present invention is used for automotive parts, it contributes to reducing the weight of an automobile and greatly contributes to improving the performance of an automobile body.
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Abstract
Description
面積率で、焼戻しマルテンサイト相:30%以上73%以下、フェライト相:25%以上68%以下、残留オーステナイト相:2%以上20%以下、他の相:10%以下(0%を含む)であり、かつ、該他の相としてマルテンサイト相:3%以下(0%を含む)、ベイニティックフェライト相:5%未満(0%を含む)を有し、前記焼戻しマルテンサイト相の平均結晶粒径が8μm以下、前記残留オーステナイト相中のC量が0.7質量%未満である鋼板組織を有する高強度溶融亜鉛めっき鋼板。
[6]前記溶融亜鉛めっき鋼板が、1180MPa以上の引張強度を有する[1]から[5]のいずれかに記載の高強度溶融亜鉛めっき鋼板。
累積圧下率20%超で冷間圧延し、冷延鋼板を製造する冷間圧延工程と、
800℃以上1000℃以下の焼鈍温度まで加熱し、該焼鈍温度で10秒以上保持した後、平均冷却速度5℃/s以上で550℃以下の冷却停止温度まで冷却する予備焼鈍工程と、
平均加熱速度10℃/s以下で680℃以上790℃以下の焼鈍温度まで加熱し、該焼鈍温度で30秒以上1000秒以下保持し、次いで1.0℃/s以上の平均冷却速度で460℃以上550℃以下の冷却停止温度まで冷却した後、該冷却停止温度で500秒以下保持する本焼鈍工程と、
本焼鈍された冷延鋼板に亜鉛めっきし、室温まで冷却する亜鉛めっき工程と、
焼戻し温度50℃以上400℃以下で焼戻しをする焼戻し工程と、
を有する高強度溶融亜鉛めっき鋼板の製造方法。
C:0.15%以上0.25%以下
Cは、マルテンサイト相を生成させたり、マルテンサイト相の硬度を上昇させたりすることでTSを上昇させるために必要な元素である。また、残留オーステナイト相を安定化し、均一伸びを得るのに必要な元素である。C量が0.15%未満では、マルテンサイト相の強度が低くまた残留オーステナイト相の安定化も不十分なため、TSが1180MPa以上と均一伸びが7.0%以上を両立することが困難である。一方、C量が0.25%を超えると曲げ性の劣化が顕著になる。したがって、C量は0.15%以上0.25%以下とする。含有量について、下限側は好ましくは0.16%以上である。上限側は好ましくは0.22%以下である。
Siは、鋼を固溶強化してTSを上昇させるのに有効な元素である。また、セメンタイト生成を抑制して残留オーステナイト相を得るのに有効な元素である。こうした効果を得るにはSi量を0.50%以上とする必要がある。一方、Siの含有量が増えると、フェライト相の過剰生成による曲げ性の低下やめっき性、溶接性の劣化を招くため、適量添加が好ましい。したがって、Si量は0.50%以上2.5%以下とする。好ましくは0.50%以上2.0%以下、より好ましくは0.50%以上1.8%以下とする。
Mnは、鋼を固溶強化してTSを上昇させたり、フェライト変態やベイナイト変態を抑制してマルテンサイト相を生成させ、TSを上昇させる元素である。また、オーステナイト相を安定化し、均一伸びを高める元素である。こうした効果を十分に得るには、Mn量を2.3%以上にする必要がある。一方、Mn量が4.0%を超えると、介在物の増加が顕著になり、曲げ性劣化の原因となる。したがって、Mn量は2.3%以上4.0%以下とする。好ましくは2.3%以上3.8%以下、より好ましくは2.3%以上3.5%以下とする。
Pは、粒界偏析により曲げ性や溶接性を劣化させるため、その量は極力低減することが望ましい。本発明ではP量は上限として0.100%まで許容できる。なお、P量は0.050%以下が好ましく、0.020%以下がより好ましい。下限は特に規定しないが、0.001%未満では生産能率の低下を招くため、0.001%以上が好ましい。
Sは、MnSなどの介在物として存在して、溶接性を劣化させるため、その量は極力低減することが好ましい。本発明ではS量は上限として0.02%まで許容できる。なお、S量は0.0040%以下が好ましい。下限は特に規定しないが、0.0005%未満では生産能率の低下を招くため、0.0005%以上が好ましい。
Alは、オーステナイト相を安定化させて残留オーステナイト相を得るのに有効な元素である。Al量が0.01%未満ではオーステナイト相を安定化させて残留オーステナイト相を得ることができない。一方、Al量が2.5%を超えると、連続鋳造時のスラブ割れの危険性が高まるばかりか、焼鈍時にフェライト相の過剰生成を招き、TS:1180MPa以上と曲げ性の両立が困難になる。したがって、Al量は0.01%以上2.5%以下とする。フェライト相の過剰生成抑制の観点から好ましくは0.01%以上1.0%以下、より好ましくは0.01%以上0.6%以下とする。
Cr、Ni、Cuはマルテンサイト相などの低温変態相を生成させ高強度化に有効な元素である。こうした効果を得るには、Cr、Ni、Cuから選ばれる少なくとも1種の元素の含有量を0.01%以上にする。一方、Cr、Ni、Cuのそれぞれの含有量が2.0%を超えると、その効果が飽和する。したがって、これらの元素を含有する場合、Cr、Ni、Cuの含有量はそれぞれ0.01%以上2.0%以下とする。各元素の含有量について、下限側は0.1%以上が好ましい。また、上限側は1.0%以下が好ましい。
Bは、粒界に偏析しフェライト相およびベイナイト相の生成を抑制し、マルテンサイト相の生成を促すのに有効な元素である。こうした効果を十分に得るには、B量を0.0002%以上にする必要がある。一方、B量が0.0050%を超えると、その効果が飽和し、コストアップを招く。したがって、Bを含有する場合、B量は0.0002%以上0.0050%以下とする。マルテンサイト相生成の観点から、含有量について、下限側は好ましくは0.0005%以上である。上限側は好ましくは0.0030%以下、より好ましくは0.0020%以下である。
Ca、REMは、いずれも硫化物の形態制御により成形性を改善させるのに有効な元素である。こうした効果を得るには、Ca、REMから選ばれる少なくとも1種の元素の含有量を0.001%以上とする。一方、Ca、REMのそれぞれの含有量が0.005%を超えると、鋼の清浄度に悪影響を及ぼし特性が低下するおそれがある。したがって、これらの元素を含有する場合、Ca、REMの含有量は0.001%以上0.005%以下とする。
焼戻しマルテンサイト相の面積率:30%以上73%以下
焼戻しマルテンサイト相の面積率が30%未満ではTS:1180MPa以上の高強度と曲げ性の両立が困難となる。一方、73%を超えると本発明の均一伸びが得られない。したがって、焼戻しマルテンサイト相の面積率は30%以上73%以下とする。面積率について、下限側は好ましくは40%以上である。上限側は好ましくは70%以下であり、より好ましくは65%以下である。
フェライト相の面積率が25%未満では本発明の均一伸びが得られない。一方、68%を超えると本発明のYSが得られない。したがって、フェライト相の面積率は25%以上68%以下とする。面積率について、下限側は好ましくは35%以上である。上限側は好ましくは60%以下である。本発明では延性や曲げ性に好ましくない未再結晶フェライト相はフェライト相に含まないものとする。
残留オーステナイト相の面積率が2%未満ではTS:1180MPa以上の高強度と均一伸び7.0%を両立することが困難となる。一方、20%を超えると曲げ性が劣化する。したがって、残留オーステナイト相の面積率は2%以上20%以下とする。面積率について、下限側は好ましくは3%以上である。上限側は好ましくは15%以下である。
マルテンサイト相の面積率が3%を超えると曲げ性の劣化が顕著になる。したがって、マルテンサイトの面積率は3%以下とする。好ましくは2%以下、より好ましくは1%以下である。
ベイニティックフェライト相の面積率が5%以上ではTS:1180MPa以上の高強度と均一伸び7.0%以上の両立が困難になる。したがって、ベイニティックフェライト相の面積率は5%未満とする。
焼戻しマルテンサイト相の平均結晶粒径が8μm超では曲げ性の劣化が顕著になる。したがって、焼戻しマルテンサイトの平均結晶粒径は8μm以下とする。平均結晶粒径は、好ましくは4μm以下である。なお、本発明において焼戻しマルテンサイト相の結晶粒とは旧オーステナイト相粒界や焼戻しマルテンサイト相とフェライト相やベイニティックフェライト相等他相との粒界によって囲まれる焼戻しマルテンサイト相の結晶粒である。
残留オーステナイト相中のC量が0.7質量%以上では残留オーステナイト相が過度に安定となり、TS:1180MPa以上の高強度と均一伸び7.0%以上の両立が困難になる。したがって、残留オーステナイト相中のC量は0.7質量%未満とする。好ましくは0.6質量%以下である。本発明において残留オーステナイト相中のC量はX線回折から求められる値とする。
a = 1.7889×(2)1/2/sinθ
a = 3.578+0.033[C]+0.00095[Mn]+0.0006[Cr]+0.022[N]+0.0056[Al]+0.0015[Cu]+0.0031[Mo]
ここで、aはオーステナイトの格子定数(Å)、θは(220)面の回折ピーク角度を2で除した値(rad)、[M]はオーステナイト中の元素Mの質量%(含有しない元素は0とする)である。本発明では残留オーステナイト相中の元素Mの質量%は鋼全体に占める質量%とした。
本発明の高強度溶融亜鉛めっき鋼板の用途は特に限定されないが、自動車部品用であることが好ましい。
本発明の高強度溶融亜鉛めっき鋼板は、例えば、上記の成分組成を有するスラブを温度1100℃以上とし、仕上げ圧延温度800℃以上で熱間圧延し、熱延鋼板を製造し、550℃以下の巻取り温度で巻き取る熱間圧延工程と、累積圧下率20%超で冷間圧延し、冷延鋼板を製造する冷間圧延工程と、800℃以上1000℃以下の焼鈍温度まで加熱し、該焼鈍温度で10秒以上保持した後、5℃/s以上の冷却停止温度で冷却停止温度550℃以下まで冷却する予備焼鈍工程と、平均加熱速度10℃/s以下で680℃以上790℃以下の焼鈍温度まで加熱し、該焼鈍温度で30秒以上1000秒以下保持し、次いで1.0℃/s以上の平均冷却速度で460℃以上550℃以下の冷却停止温度まで冷却した後、該冷却停止温度で500秒以下保持する本焼鈍工程と、本焼鈍された冷延鋼板に亜鉛めっきし、或いはさらに460~580℃に加熱してめっき合金化処理し、室温まで冷却する亜鉛めっき工程と、焼戻し温度50℃以上400℃以下で焼戻しをする焼戻し工程と、を有する製造方法によって製造できる。以下、詳しく説明する。
スラブ温度:1100℃以上
スラブの温度が1100℃未満では炭化物が溶け残り、本発明の鋼板組織が得られなくなる。したがって、スラブ加熱温度は1100℃以上とする。また、スケールロスの増大を防止するため、スラブの加熱温度は1300℃以下とすることが好ましい。なお、本発明の熱間圧延工程においてスラブ等被圧延材の温度とは、スラブ等被圧延材の幅中央部かつ長さ中央部の表面温度とする。
仕上げ圧延温度が800℃未満になるとフェライト相等が生成して2相域圧延となり、鋼板組織が不均一になり、本発明の鋼板組織が得られない。したがって、仕上げ圧延温度は800℃以上とする。一方、仕上げ圧延温度の上限は特に限定されず、950℃以下が好ましい。
巻取り温度が550℃を超えると熱延コイル中にフェライト相やパーライト相等の軟質相が混入し、本発明の鋼板組織が得られなくなる。したがって、巻取り温度は550℃以下とする。下限は特に規定しないが400℃未満になると板形状が悪化するため、400℃以上が好ましい。
累積圧下率:20%超
累積圧下率が20%以下では焼鈍の際に粗大粒が生じやすくなって本発明の鋼板組織が得られない。したがって、冷間圧延工程の累積圧下率は20%超えとする。好ましくは30%以上である。なお、上限は特に規定しないが、板形状の安定性等の観点から90%以下程度が好ましく、75%以下がより好ましい。
4-3)予備焼鈍工程
焼鈍温度:800℃以上1000℃以下
予備焼鈍工程の焼鈍温度が800℃未満では、オーステナイト相の生成が不十分になり、本発明の鋼板組織が得られない。一方、1000℃を超えるとオーステナイト粒が粗大になって本発明の鋼板組織が得られない。したがって、予備焼鈍工程の焼鈍温度は800℃以上1000℃以下とする。好ましくは800℃以上930℃以下である。
予備焼鈍の焼鈍保持時間が10秒未満では、オーステナイトの生成が不十分になり、本発明の鋼板組織が得られない。したがって、予備焼鈍工程の焼鈍保持時間は10秒以上とする。予備焼鈍の焼鈍保持時間は特に限定されず、500秒以下とすることが好ましい。
焼鈍温度から550℃までの平均冷却速度が5℃/s未満では冷却中にフェライト相やパーライト相が生成して、本発明の鋼板組織が得られない。したがって、550℃までの平均冷却速度は5℃/s以上とする。好ましくは8℃/s以上である。
5℃/s以上の平均冷却速度での冷却停止温度が550℃を超えるとフェライト相やパーライト相が多量に生成して、本発明の鋼板組織が得られない。したがって、5℃/s以上の平均冷却速度での冷却停止温度は550℃以下とする。また、550℃を下回る冷却停止温度とする場合、550℃を下回る範囲の冷却速度は特に限定されず、5℃/s未満としてもよい。冷却停止温度の下限は適宜調整可能であり、0℃以上とすることが好ましい。なお、本発明では、予備焼鈍工程において冷却後に再加熱を行っても良い。該再加熱温度はフェライト相やパーライト相抑制の観点から50~550℃が好ましい。また、フェライト相やパーライト相抑制の観点から再加熱温度での保持時間は1~1000秒が好ましい。予備焼鈍後は50℃以下まで冷却する。
平均加熱速度:10℃/s以下
焼鈍温度までの平均加熱速度が10℃/sを超えると粗大なオーステナイトが生成し、本発明の鋼板組織が得られない。したがって、平均加熱速度は10℃/s以下とする。なお、該平均加熱速度は焼鈍温度と200℃との温度差を200℃から焼鈍温度までの加熱時間で除した値である。
焼鈍温度が680℃未満ではオーステナイト相の生成が不十分になり、本発明の鋼板組織が得られない。一方、790℃を超えるとオーステナイト相が過剰に生成して本発明の鋼板組織が得られない。したがって、焼鈍温度は680℃以上790℃以下とする。好ましくは700℃以上790℃以下である。
焼鈍保持時間が30秒未満ではオーステナイト相の生成が不十分になり、本発明の鋼板組織が得られない。一方、1000秒を超えるとオーステナイト相が粗大化し、本発明の鋼板組織が得られない。したがって、焼鈍保持時間は30~1000秒とする。焼鈍保持時間について、下限側は好ましくは60秒以上である。上限側は好ましくは600秒以下である。
焼鈍温度から冷却停止温度までの平均冷却速度が1.0℃/s未満では、冷却中にフェライト相やパーライト相あるいはベイナイト相が多量に生成し、本発明の鋼板組織が得られない。したがって、平均冷却速度は1.0℃/s以上とする。平均冷却速度の上限は特に限定されず、適宜調整可能である。好ましくは、100℃/s以下である。
平均冷却速度が1.0℃/s以上での冷却停止温度が460℃未満になるとベイナイト相が多量に生成し、本発明の鋼板組織が得られない。一方、550℃を超えるとフェライト相やパーライト相が多量に生成し、本発明の鋼板組織が得られない。したがって、冷却停止温度は460℃以上550℃以下とする。
冷却停止保持時間が500秒を超えるとベイナイトやパーライトが多量に生成し、本発明の鋼板組織が得られない。したがって、冷却停止保持時間は500秒以下とする。一方、冷却停止保持時間の下限は特に限定されず、適宜調整可能であり、保持無しでも構わない。なお、ここで冷却停止保持時間とは、焼鈍後550℃以下まで冷却された後から亜鉛めっき浴浸漬までの時間を意味し、厳密に冷却停止後に冷却停止時の温度を保持する必要はなく、460℃以上550℃以下の温度域にあれば冷却や昇温することができる。
めっき処理は、上記により得られた鋼板を440℃以上500℃以下の亜鉛めっき浴中に浸漬し、その後、ガスワイピングなどによってめっき付着量を調整して行うことが好ましい。さらに亜鉛めっきを合金化する際は460℃以上580℃以下の温度域に1秒以上120秒以下保持して合金化することが好ましい。亜鉛めっきはAl量が0.08質量%以上0.25%質量%以下である亜鉛めっき浴を用いることが好ましい。
焼戻し温度:50℃以上400℃以下
焼戻し温度が50℃未満ではマルテンサイト相の焼戻しが不十分となり本発明の鋼板組織が得られない。一方、400℃を超えるとオーステナイト相が分解し、本発明の鋼板組織が得られない。したがって、焼戻し温度は50℃以上400℃以下とする。焼戻し温度について、下限側は100℃以上が好ましい。上限側は350℃以下が好ましい。焼戻し処理は連続焼鈍炉、箱型焼鈍炉等いずれを使用してもかまわない。コイルままで焼戻し処理する場合などのように鋼板同士の接触がある場合は凝着抑制等の観点から焼戻し時間は24時間以下とすることが好ましい。
伸長率:0.05%以上1.00%以下
本発明では焼戻し工程前もしくは後、又はその両方に伸長率が0.05%以上1.00%以下の調質圧延を施すことができる。この調質圧延によりYSが上昇する。このような効果を得るには0.05%以上の伸長率とする。一方、1.00%を超えると均一伸びが低下するおそれがある。したがって、調質圧延工程を行う場合は、調質圧延の伸長率は0.05%以上1.00%以下とする。
表1に示す成分組成の鋼を真空溶解炉により溶製し、圧延して鋼スラブとした。これらの鋼スラブを、表2に示す条件で、加熱後、粗圧延を施し、仕上げ圧延して冷却し、巻き取り相当処理を施し、熱延鋼板とした。次いで、1.4mmまで冷間圧延して冷延鋼板を作製し、予備焼鈍、本焼鈍に供した。その後、めっき処理を行い(Al量が0.08質量%以上0.25質量%以下である亜鉛めっき浴を使用)、室温まで冷却し、焼き戻し処理を行った。場合により、焼戻し処理の前及び/又は後に調質圧延をおこなった。以上のような条件にて鋼板No.1~37を作製した。焼鈍は連続溶融亜鉛めっきラインを模擬して実験室にて表2に示す条件で行い、溶融亜鉛めっき鋼板(GI)および合金化溶融亜鉛めっき鋼板(GA)を作製した。溶融亜鉛めっき鋼板は460℃のめっき浴中に浸漬し、付着量35~45g/m2のめっき層を形成させ、合金化溶融亜鉛めっき鋼板はめっき形成後460~580℃の範囲内で合金化処理を行うことで作製した。得られためっき鋼板について、以下の試験方法にしたがい、引張特性、曲げ性を求めた。結果を表3に示した。
最終製造工程後の鋼板より、圧延方向に対して直角方向にJIS5号引張試験片(JIS Z 2201)を採取し、歪速度が10-3/sとするJIS Z 2241の規定に準拠した引張試験を行い、TS、YS、UELを求めた。TSは1180MPa以上、YSは850MPa以上、UELは7.0%以上の場合を合格とした。
焼鈍板より、圧延方向に対して平行方向を曲げ試験軸方向とする、幅が35mm、長さが100mmの短冊形の試験片を、それぞれ採取し、曲げ試験を行った。ストローク速度が10mm/s、押込み荷重が10ton、押付け保持時間5秒、曲げ半径Rが2.0mmで90°V曲げ試験を行い、曲げ頂点の稜線部を10倍の拡大鏡で観察し、幅位置の1箇所で0.5mm以上の亀裂が認められたものを劣、亀裂が0.5mm未満のものを優として判定した。
Claims (9)
- 質量%で、C:0.15%以上0.25%以下、Si:0.50%以上2.5%以下、Mn:2.3%以上4.0%以下、P:0.100%以下、S:0.02%以下、Al:0.01%以上2.5%以下、残部がFeおよび不可避的不純物からなる成分組成を有し、
面積率で、焼戻しマルテンサイト相:30%以上73%以下、フェライト相:25%以上68%以下、残留オーステナイト相:2%以上20%以下、他の相:10%以下(0%を含む)であり、かつ、該他の相としてマルテンサイト相:3%以下(0%を含む)、ベイニティックフェライト相:5%未満(0%を含む)を有し、前記焼戻しマルテンサイト相の平均結晶粒径が8μm以下、前記残留オーステナイト相中のC量が0.7質量%未満である鋼板組織を有する高強度溶融亜鉛めっき鋼板。 - 成分組成において、さらに、質量%で、Cr:0.01%以上2.0%以下、Ni:0.01%以上2.0%以下、Cu:0.01%以上2.0%以下から選ばれる少なくとも一種の元素を含有する請求項1に記載の高強度溶融亜鉛めっき鋼板。
- 成分組成において、さらに、質量%で、B:0.0002%以上0.0050%以下を含有する請求項1または2に記載の高強度溶融亜鉛めっき鋼板。
- 成分組成において、さらに、質量%で、Ca:0.001%以上0.005%以下、REM:0.001%以上0.005%以下から選ばれる少なくとも一種の元素を含有する請求項1から3のいずれかに記載の高強度溶融亜鉛めっき鋼板。
- 前記溶融亜鉛めっき鋼板が合金化溶融亜鉛めっき鋼板を含む請求項1から4のいずれかに記載の高強度溶融亜鉛めっき鋼板。
- 前記溶融亜鉛めっき鋼板が、1180MPa以上の引張強度を有する請求項1から5のいずれかに記載の高強度溶融亜鉛めっき鋼板。
- 請求項1から4のいずれかに記載の成分組成を有するスラブを温度1100℃以上とし、仕上げ圧延温度800℃以上で熱間圧延し、熱延鋼板を製造し、550℃以下の巻取り温度で巻き取る熱間圧延工程と、
累積圧下率20%超で冷間圧延し、冷延鋼板を製造する冷間圧延工程と、
800℃以上1000℃以下の焼鈍温度まで加熱し、該焼鈍温度で10秒以上保持した後、平均冷却速度5℃/s以上で550℃以下の冷却停止温度まで冷却する予備焼鈍工程と、
平均加熱速度10℃/s以下で680℃以上790℃以下の焼鈍温度まで加熱し、該焼鈍温度で30秒以上1000秒以下保持し、次いで1.0℃/s以上の平均冷却速度で460℃以上550℃以下の冷却停止温度まで冷却した後、該冷却停止温度で500秒以下保持する本焼鈍工程と、
本焼鈍された冷延鋼板に亜鉛めっきし、室温まで冷却する亜鉛めっき工程と、
焼戻し温度50℃以上400℃以下で焼戻しをする焼戻し工程と、
を有する高強度溶融亜鉛めっき鋼板の製造方法。 - 前記亜鉛めっき工程は、亜鉛めっきし、さらに、460℃以上580℃以下の温度域に1秒以上120秒以下保持するめっき合金化処理をし、その後室温まで冷却することを含む請求項7に記載の高強度溶融亜鉛めっき鋼板の製造方法。
- さらに、前記焼戻し工程前もしくは後、又はその両方に伸長率0.05%以上1.00%以下で調質圧延をする調質圧延工程を有する請求項7または8に記載の高強度溶融亜鉛めっき鋼板の製造方法。
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Also Published As
Publication number | Publication date |
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CN107208206B (zh) | 2019-08-02 |
CN107208206A (zh) | 2017-09-26 |
US20180002800A1 (en) | 2018-01-04 |
EP3219822A1 (en) | 2017-09-20 |
US10450642B2 (en) | 2019-10-22 |
KR101930186B1 (ko) | 2018-12-17 |
KR20170086654A (ko) | 2017-07-26 |
JPWO2016113789A1 (ja) | 2017-04-27 |
EP3219822A4 (en) | 2017-12-06 |
MX2017009200A (es) | 2017-12-07 |
JP6052472B2 (ja) | 2016-12-27 |
EP3219822B1 (en) | 2018-08-22 |
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