WO2004070075A1 - めっき密着性に優れた合金化溶融亜鉛めっき鋼板およびその製造方法 - Google Patents
めっき密着性に優れた合金化溶融亜鉛めっき鋼板およびその製造方法 Download PDFInfo
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- WO2004070075A1 WO2004070075A1 PCT/JP2004/001209 JP2004001209W WO2004070075A1 WO 2004070075 A1 WO2004070075 A1 WO 2004070075A1 JP 2004001209 W JP2004001209 W JP 2004001209W WO 2004070075 A1 WO2004070075 A1 WO 2004070075A1
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- steel sheet
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 226
- 239000010959 steel Substances 0.000 title claims abstract description 226
- 239000011701 zinc Substances 0.000 title abstract description 21
- 229910052725 zinc Inorganic materials 0.000 title abstract description 13
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 title abstract description 8
- 238000007598 dipping method Methods 0.000 title abstract 5
- 238000000034 method Methods 0.000 title description 32
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- 229910001335 Galvanized steel Inorganic materials 0.000 claims description 41
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 41
- 239000008397 galvanized steel Substances 0.000 claims description 41
- 238000010438 heat treatment Methods 0.000 claims description 38
- 238000005275 alloying Methods 0.000 claims description 34
- 239000000203 mixture Substances 0.000 claims description 25
- 229910052799 carbon Inorganic materials 0.000 claims description 19
- 229910052698 phosphorus Inorganic materials 0.000 claims description 18
- 229910052758 niobium Inorganic materials 0.000 claims description 16
- 229910052719 titanium Inorganic materials 0.000 claims description 16
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 15
- 229910052760 oxygen Inorganic materials 0.000 claims description 15
- 239000001301 oxygen Substances 0.000 claims description 15
- 229910052710 silicon Inorganic materials 0.000 claims description 14
- 229910052720 vanadium Inorganic materials 0.000 claims description 13
- 238000004519 manufacturing process Methods 0.000 claims description 11
- 238000005246 galvanizing Methods 0.000 claims description 7
- 229910052742 iron Inorganic materials 0.000 claims description 7
- 239000011247 coating layer Substances 0.000 claims description 5
- 229910052717 sulfur Inorganic materials 0.000 claims description 5
- 229910052748 manganese Inorganic materials 0.000 claims description 4
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 2
- 238000012360 testing method Methods 0.000 description 28
- 238000011156 evaluation Methods 0.000 description 27
- 230000000694 effects Effects 0.000 description 20
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 18
- 238000000137 annealing Methods 0.000 description 18
- 239000010936 titanium Substances 0.000 description 17
- 239000011295 pitch Substances 0.000 description 13
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- 229910052757 nitrogen Inorganic materials 0.000 description 11
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 10
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 10
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- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
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- 238000012935 Averaging Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 101000993059 Homo sapiens Hereditary hemochromatosis protein Proteins 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 239000012670 alkaline solution Substances 0.000 description 2
- 239000004566 building material Substances 0.000 description 2
- 238000005097 cold rolling Methods 0.000 description 2
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- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 241001422033 Thestylus Species 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/26—After-treatment
- C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/26—After-treatment
- C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
- C23C2/29—Cooling or quenching
-
- 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
-
- 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
- Y10T428/12472—Microscopic interfacial wave or roughness
-
- 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]
Definitions
- the present invention relates to an alloyed hot-dip galvanized steel sheet having excellent plating adhesion to a base steel sheet and a method for producing the same.
- the interface between the plated layer of the alloyed hot-dip galvanized steel sheet and the base steel sheet is fragile.
- the plated layer peels off during press forming with a mold, and the peeled plating layer adheres to the mold, resulting in product quality. It is necessary to frequently clean the mold because it deteriorates.
- the adhered layer is peeled off at the adhesive joint part by the auxiliary material, and a desired adhesive strength cannot be obtained.
- the plating layer is peeled off due to chipping caused by stone splashes or the like when the vehicle is running in the winter, and thus it is not possible to maintain a desired waterproof property.
- hot-dip galvanized steel sheets are cleaned by degreasing and Z or pickling the surface of the material steel sheet in the pre-treatment process, or by omitting the pre-treatment process in a preheating furnace. After burning off the oil, it is pre-ripened in a weakly oxidizing or reducing atmosphere and then recrystallized and annealed in a reducing atmosphere. Then, the material steel sheet is cooled to a temperature suitable for plating in a reducing atmosphere, and immersed in a hot-dip galvanizing bath containing a small amount of A1 (about 0.1 to 0.2% by mass) without contacting the atmosphere. After that, it is manufactured by adjusting the plating thickness.
- the plated layer of the alloyed hot-dip galvanized steel sheet consists of an Fe-Zn alloy phase formed by the interdiffusion of Fe and Zn.
- a Fe-Zn alloy phase with a high Fe content is formed near the interface between the plating layer and the base steel sheet, and a Fe-Zn alloy phase with a low Fe content is formed toward the plating surface layer. Since the Fe-Zn alloy phase with a high Fe content (for example, ⁇ phase and ⁇ 1 phase) formed near the interface between the plating layer and the steel sheet is hard and brittle, if it is formed too thick, it will cause Promotes the brittleness of the interface of the material steel plate.
- Patent Document 1 when a steel sheet with high strength (for example, a steel sheet in which the base material contains a large amount of C and other alloy elements and has a tensile strength of 440 MPa or more) is used, the method described in Patent Document 1 is not necessarily satisfactory. There was a problem that the adhesion of the tacky film could not be obtained.
- Patent Document 2 a P-added steel containing P: 0.010 to 0.10 mass% and Si: 0.05 to 0.20 mass% in a base material and satisfying Si ⁇ P It is described that the adhesion of the plating film is improved when is used. When applied to steel sheets other than the P-added steel, there was a problem that a satisfactory adhesion of the plating film could not be obtained.
- Patent Document 3 low-carbon steel of C: 0.05 to 0.25 mass% is used as a base material, and in the case of a high-strength retained austenitic steel to which appropriate amounts of Si and A1 are added, Ti, A technique has been disclosed in which an appropriate amount of Nb or the like is added to fix the grain boundary C to improve the plating interface strength.
- this is a technique for retained austenitic steel, and the method described in Patent Document 3 has a problem that sufficient performance is not necessarily obtained for other high-strength steel sheets having no residual austenite phase.
- Patent Documents 4 and 5 disclose techniques in which the surface roughness of a steel sheet after removing a plating layer is 6 points or more in terms of a 10-point average roughness Rz.
- Patent Document 6 discloses that the surface roughness Rz of the steel surface after removing the plating film of P-added steel is 12 ⁇ Rz ⁇ 0.0075.
- Sm + 6.7 where Rz ( ⁇ ): 10-point average
- a technique has been disclosed in which the roughness, Sra ( ⁇ ), is the average distance between irregularities.
- the shape of the interface between the plating layer and the base steel sheet, which contributes to the plating adhesion was determined by the 10-point average roughness Rz expressed by the conventional knowledge. It is important to obtain fine irregularities that cannot be defined, and it has been newly obtained that it is possible to obtain an alloyed hot-dip galvanized steel sheet with remarkably excellent adhesion and adhesion, which has not been achieved in the past.
- Patent Document 1 Patent No. 3163986
- Patent Document 2 Patent No. 2993404
- Patent Document 3 JP 2001-335908 A
- Patent Document 4 Patent No. 2638400
- Patent Document 5 Patent No. 2932850
- Patent Document 6 Patent No. 2976845 Disclosure of the Invention
- An object of the present invention is to provide an alloyed hot-dip galvanized steel sheet having significantly superior plating adhesion as compared with conventional products, and a method for producing the same.
- the gist of the present invention is as follows.
- the material steel sheet is represented by mass%, and C: 0.25% or less;
- An alloy with excellent adhesion and adhesion characterized by containing Si: 0.03% to 2.0% and P: 0.005% to 0.07%, and having a composition satisfying the following formula (1). Fused zinc coated steel sheet.
- [C], [P] and [Si] are the contents of C, P and Si in the steel sheet, respectively.
- the material steel sheet further contains, by mass%, Mn: 5% or less, S: 0.011% or less.
- the material steel sheet may further contain Ti: 0.2% or less, Nb: 0.2% or less in mass%.
- [C], [P] and [Si] mean the contents (% by mass) of C, P and Si in the material steel sheet, respectively.
- the material steel sheet further has a composition containing, by mass%, Mn: 5% or less, S: 0.01% or less, and A1: 0.08% or less.
- the material steel sheet further contains, by mass%, Ti: 0.2% or less, Nb: 0.2% or less, and V: 0.2% or less.
- FIG. 1 is a SEM photograph of the steel sheet surface after the plating layer is dissolved and removed in the alloyed hot-dip galvanized steel sheet of the present invention.
- FIG. 2 is a cross-sectional SEM photograph of the alloyed hot-dip galvanized steel sheet of the present invention.
- FIG. 3 is a diagram illustrating fine irregularities formed at the interface between the plating layer and the steel sheet in the alloyed hot-dip galvanized steel sheet of the present invention.
- Figure 4 is a graph showing the relationship between the proportion of fine irregularities formed at the interface between the plating layer and the steel sheet and the plating interface strength.
- FIG. 5 is a graph showing the relationship between the developed area ratio Sdr and the plating interface strength.
- FIG. 6 is a graph showing the effect of the Si content and the heating rate on the area ratio of fine irregularities in a steel sheet containing one or more of Ti, Nb, and V.
- FIG. 7 is a diagram showing an outline of a test material used for a tensile test for evaluating plating adhesion 1.
- FIG. 8 is a diagram showing an outline of a test for evaluating plating adhesion 2 (bending-bending return processing test).
- FIG. 9 is a diagram showing an outline of a test in which a plating die 4 is mounted on a bead mold and formed into a U-shape in order to evaluate plating adhesion4.
- Fig. 10 is a 3D-S EM image of the material surface after removing the plating layer of the alloyed hot-dip galvanized steel sheet, (a) is a poor adhesion material (comparative example), (b) is adhesion This is the case with a material having good properties (inventive example).
- the first aspect of the present invention is to provide an alloyed hot-dip galvanized layer and a steel sheet on which the hot-dip galvanized layer is to be formed at a pitch of 0.5 m or less and a depth of 10 nm or more.
- This is an alloyed hot-dip galvanized steel sheet with excellent adhesion and adhesion, with one or more irregularities per 5 / zm of interface length.
- the present inventors have conducted intensive studies and found that by forming continuous fine irregularities at the interface between the plating layer and the steel sheet, the adhesion at the interface between the plating layer and the material steel sheet is significantly improved by the anchor effect. I found it.
- FIG. 1 and FIG. 2 are SEM photographs observed with a scanning electron microscope (SEM) showing continuous irregularities at the interface between the plating layer and the material steel sheet according to one embodiment of the present invention.
- Fig. 1 shows the results of a scanning electron microscope in which the alloyed hot-dip galvanized layer is dissolved and removed by applying ultrasonic waves in an alkaline solution to expose the surface of the material steel sheet at the interface between the plating layer and the material steel sheet. This is a SEM photograph of the surface.
- Figure 2 is a cross-sectional SEM photograph of a cross-section of an alloyed hot-dip galvanized steel sheet polished, etched with a 0.1% by mass nitral solution, and observed with a scanning electron microscope. It is preferable that the pitch of the uneven portion is finer and the depth of the unevenness is deep.
- the present inventors have examined the correlation between the plating adhesion and the recessed state at the plating interface, and found that the results are as follows.
- the pitch depth is measured by using the unevenness curve 1 of the interface which can be confirmed by the cross-sectional observation.
- a certain reference length L (for example, ⁇ . ⁇ ⁇ ) Inside Find the valley 2 with the lowest height, and the two peaks 3 and 4 with the highest height on both sides of the valley 2, respectively, and find the length between these two peaks 3 and 4.
- the linear distance measured in the direction is defined as the pitch P, and the linear distance measured in the height direction between the lower peak 3 and the valley 2 of the two peaks 3 and 4 is defined as the depth D.
- the depth D is lO nm or more within the reference length L (for example, 0.5 / m)
- a depth D of 10 nm or more at a pitch P of 0.5 / zm or less It will have fine irregularities.
- irregularities having a pitch D of 0.5 m or less and a depth D of 10 nm or more correspond to the length of the interface (where the interface length is a straight line between two points on the interface in the cross section in the thickness direction). This means the distance.) There must be at least one per 5 / zm. If it does not exist at this ratio, it does not contribute to improvement in plating adhesion.
- the method of measuring the unevenness is performed as described below. That is, the plating section of ⁇ ⁇ length is divided into reference lengths L (0.5 ⁇ m) and observed in 20 fields of view (each field shall be measured at least at a magnification of 5000 or more).
- FIG. 4 shows the relationship between the ratio occupied by the fine irregularities measured as described above and the adhesion strength of the plating layer. From FIG. 4, it can be seen that when the proportion of the fine unevenness is 10% or more, the adhesion strength of the plating layer shows a high value.
- the adhesion strength of the plating layer is a value obtained by performing a tensile test according to the method described in the following example (evaluation of plating adhesion 1), and dividing the tensile strength by the bonding area.
- irregularities with a pitch of 0.5 m or less and a depth of 10 nm or more are formed at the interface between the alloyed hot-dip galvanized layer and the material steel sheet per 5 ⁇ m of the interface length. Need to exist more than one.
- the developed area ratio Sdr of the surface shape of the material steel sheet observed after removing the alloyed hot-dip galvanized layer by applying a high-pass filter with a cut-off wavelength of 0.5 ⁇ m is 2. It is an alloyed hot-dip galvanized steel sheet having excellent adhesion and adhesion characterized by being 0 or more.
- the present inventors have focused on the development area ratio Sdr as an index that can measure the degree of the continuous irregularities at the steel sheet interface shown in FIGS. 1 and 2 from the surface.
- Developed interfacial area ratio shows the ratio of the area of the actual uneven surface to the area of the flat surface without unevenness in the measurement area, and is expressed by the following formula.
- A The actual surface area of the convex interface in the measurement area
- Sdr is large at the interface with large irregularities and large surface area. Since the interface shape according to the present invention is very minute unevenness, it has been difficult to quantitatively evaluate it. However, it was considered that a good interface was revealed, a high-magnification SEM image was obtained, and the above evaluation index was accurately calculated to evaluate minute irregularities. That is, after removing the plating layer of the alloyed hot-dip galvanized steel sheet, the surface of the material was coated with tens of nm of Au so as not to be affected by the surface composition, and this was treated with Elionix's electron beam three-dimensional roughness. Measurements were performed using the analyzer ERA-8800FE, and shape analysis was performed to determine the developed area ratio Sdr.
- the shape analysis was performed at an accelerating voltage of 15 kV.
- a 10,000-fold field of view (viewing area: 12 ⁇ 9 / im) was captured at a resolution of 1200 ⁇ 900 points, and data processing was performed.
- the development area ratio Sdr was determined by arbitrarily selecting an area and averaging it.
- the height calibration using this device was conducted by NIST, a U.S. national research institute, using the SHS thin film step standard (for the stylus and optical surface roughness measuring instruments of VLSI Standard, a traceable sampler). Steps of 18 nin, 88 nm, and 450 nm) were used. Furthermore, a high-pass filter with a cut-off wavelength of 0.5 ⁇ was used to calculate the three-dimensional shape parameters.
- FIG. 10 shows a measurement example.
- Fig. 10 (a) is a 3D-SEM image of a material with poor adhesion (Comparative Example)
- Fig. 10 (b) is a 3D-SEM image of a material with good adhesion (Invention Example).
- Fig. 5 is a graph showing the relationship between the developed area ratio Sdr value and the plating interface strength at the interface between the plating layer and the base steel sheet. From Fig. 5, it can be seen that high interface strength can be obtained when the developed area ratio Sdr value is 2.0% or more.
- the shape is defined using the expansion area ratio of the three-dimensional parameter which is considered to be most suitable for evaluation. However, after performing the same high-pass filter processing, the RSm (roughness) of the two-dimensional parameter is determined. The average length of the curve element can also be used for evaluation.
- the material steel sheet contains, by mass%, C: 0.25% or less, Si: 0.03 to 2.0% and P: 0.005 to 0.07%, and satisfies the following formula (1) Preferably, it is a composition.
- [C], [P] and [Si] mean the contents (% by mass) of C, P and Si in the material steel sheet, respectively.
- the components C, P, and Si in the steel of the base steel sheet (base metal) be within the above ranges for the following reasons.
- all element contents (%) mean mass%.
- the C content can easily increase the strength of steel, and is an essential element for increasing the strength of the base steel sheet. However, if the C content is too large, the ductility or weldability of the base material deteriorates, so the C content is preferably set to 0.25% or less. In the case of steel sheets for deep drawing, it is desirable not to add C as much as possible.
- Si is an element that strengthens the steel and also forms a continuous uneven portion at the interface between the plating layer and the base steel sheet. Details are unknown, but if the Si content is less than 0.03%, it is difficult to form continuous concave and convex portions. On the other hand, since Si delays the alloying reaction, it is desirable not to add Si as much as possible from the viewpoint of alloying. If the Si content is more than 2.0%, the effect of improving the plating adhesion will be saturated and the alloying reaction will be excessive. The problem of delay is likely to occur. Therefore, the Si content is preferably in the range of 0.03 to 2.0%.
- P is a strengthening element for steel.
- it is a remarkable grain boundary segregation element, which excessively delays the alloying reaction and deteriorates the weldability. Therefore, it is desirable to reduce the P content as much as possible. 0.07% or less is preferable.
- the P content is 0.005%. It is preferable that it is above.
- the content of C, Si, and P in the material steel sheet is limited to the above range, and the composition satisfy the following expression (1).
- [C], [P] and [Si] are the contents of C, P and Si in the steel sheet, respectively.
- C and P are steel strengthening elements, and are essential elements for increasing strength. That is, in order to form a continuous uneven portion that contributes to plating adhesion, it is necessary to adjust the amount of Si added as shown in the above equation (1) according to the amounts of C and P added. In the case of [C] + [P] ⁇ [Si], it is easy to form a continuous uneven portion at the interface between the plating layer and the steel sheet.
- elements other than C, Si and P may be contained in the steel.
- Mn is a strengthening element for steel and can be contained as needed. 'However, if the Mn content exceeds 5%, the workability and economy of the base material are impaired, so the Mn content is preferably set to 5% or less. In order to sufficiently obtain the strengthening effect of steel, the Mn content is preferably set to 0.5% or more.
- the S content is preferably set to 0.01% or less.
- the A1 content is preferably set to 0.08% or less. In order to exhibit the function as a deoxidizing agent, the A1 content is preferably set to 0.02% or more.
- one or more selected from Ti, Nb and V may be contained as a steel strengthening element. All of Ti, Nb and V combine with C and N in steel to form fine precipitates, which can increase the strength of the material steel sheet.
- the respective components of Ti, Nb and V are added in excess of 0.2%, the workability tends to be impaired, so the contents of Ti, Nb and V are each 0.2%. It is preferable to set the following.
- Ti, Nb and V When one or more selected from Ti, Nb and V are added in an appropriate amount, they are combined with solid solution P to form a fine precipitate of Fe— (Ti, Nb, V) -P, Some solid solution P can be made harmless. As a result, the plating interface strength can be significantly improved without excessively delaying the interdiffusion reaction between Fe and Zn. In order to achieve such an effect, it is preferable to include one or more of Ti, Nb and V satisfying the following expression (3) according to the P content in the steel.
- [Ti], [Nb], [V] and [P] mean the contents (% by mass) of Ti, Nb, V and P in the base steel sheet, respectively.
- Components such as Cr, Mo, Cu, Ni, Ca, B, N, and Sb other than the components in the material steel plate described above do not contribute to the effects of the present invention at all regardless of whether or not they are added. Therefore, it may be added as needed.
- Reasons for addition and preferred ranges are as follows. Cr: 0.5% or less
- the content is preferably set to 0.5% or less.
- Ni 0.5% or less It is a plating property improving element and may be added as necessary. However, if the content exceeds 0.5%, the effect is saturated and the economy is impaired. Therefore, the content is preferably set to 0.5% or less.
- Secondary processing embrittlement can be improved by strengthening the grain boundaries. If the content exceeds 0.003%, the effect is saturated, so the content is preferably 0.003% or less.
- N is mixed in as an impurity. If it exceeds 0.01%, the ductility decreases, so that 0.01% or less is preferable.
- the content is preferably 0.05% or less.
- the balance other than the elements described above is preferably made of Fe and unavoidable impurities.
- the tensile strength of the base steel sheet is preferably 440 MPa or more as measured by a tensile test method specified in JIS G 3302 using a No. 5 test piece specified in JIS Z2201. Good. This is because by using a high-tensile steel sheet with a tensile strength of 440MPa or more, the material steel sheet can satisfy the demand for higher strength and / or lighter weight in the fields of automobiles, home appliances, and building materials.
- the unevenness of the present invention an unevenness of 0.5 nm or less at a pitch of 10 nm or less and a depth of 10 nm or more, More than one piece of force, or the surface area of the material steel sheet observed by peeling off the galvannealed layer, using a high-pass filter with a cut-off wavelength of 0.5 ⁇ to measure the developed area ratio
- the manufacturing conditions for forming irregularities having an Sdr of 2.0% or more will be described below.
- the alloyed hot-dip galvanized steel sheet of the present invention can be produced, for example, by subjecting a steel sheet having the above-described composition to a material steel sheet and subjecting it to hot-dip galvanizing and then performing an alloying treatment.
- the material steel sheet may be any of a hot-rolled steel sheet, a cold-rolled steel sheet, or a steel sheet subjected to a special heat treatment, and is not particularly limited.
- the material steel sheet is cleaned by degreasing or pickling the surface in the pre-treatment process, or by omitting the pre-treatment process and burning off the oil on the surface of the material steel plate in the preheating furnace, and then reducing the surface. Anneal at about 750 to 900 ° C in the atmosphere.
- Si may be selectively oxidized to the surface of Fe even in a reducing atmosphere.
- Si oxides selectively oxidized on the surface reduce ⁇ S relatability with molten zinc during plating and cause non-plating, so it is necessary to suppress selective surface oxidation in a reducing atmosphere .
- it has the effect of forming fine concaves and convexes at the interface between the Si plating layer in steel and the material steel sheet.However, even if Si is present as an oxide, its effect is not exhibited. It is necessary to substantially suppress selective surface oxidation in a reducing atmosphere.
- the method for obtaining a state in which Si is not substantially selectively oxidized in a reducing atmosphere using a steel in which Si is added to the steel is not particularly limited, but may be a method before annealing in a reducing atmosphere.
- there is a method of performing a preliminary heat treatment or a heating and heating treatment in a weakly oxidizing atmosphere for example, an inert gas atmosphere containing a trace amount of oxygen of l vol% or less.
- weakly oxidizing atmosphere means an oxidizing atmosphere that can be sufficiently reduced in a subsequent reducing atmosphere, and is not particularly limited.
- the weakly oxidizing atmosphere includes, for example, oxygen: 0.01 to 0.5 vol%, dew point: -20 ° C to + 20 ° C, the balance being nitrogen, and temperature: 300 to 500 ° C.
- Examples of the reducing atmosphere include an atmosphere containing 3 to 20 vol% of hydrogen, the balance being nitrogen, and a temperature of 750 to 900 ° C.
- the iron oxide formed in the weakly oxidizing atmosphere The material is reduced by subsequent annealing in a reducing atmosphere, and the Si oxide is not reduced even during annealing in a reducing atmosphere, so it remains as an internal oxide in the base steel immediately below the surface of the base steel sheet .
- This internal oxide is distinguished from an oxide in which Si is selectively oxidized on the surface, and has an action of suppressing the selective oxidation of Si in the surface during annealing in a reducing atmosphere. This internal oxide remains after the galvanizing step and the subsequent alloying step.
- the method for obtaining a state in which Si is not substantially selectively oxidized in a reducing atmosphere is not particularly limited, and any method that does not prevent the effect of the present invention is used. Absent.
- the annealed material steel sheet is cooled to a temperature suitable for plating in the reducing atmosphere, preferably to 440 to 540 ° C, and immersed in a hot-dip galvanizing bath without being exposed to the air to be plated.
- the atmosphere immediately before plating is an atmosphere having an oxygen concentration of 0.005 vol% or less. This is because oxygen, in particular, reduces the reactivity of the surface of the base steel sheet and inhibits the formation of fine irregularities at the interface between the plating layer and the base steel sheet.
- the remaining gas other than oxygen is not limited because it does not particularly affect the formation of the fine irregularities.
- oxygen lowers the wettability with the molten zinc and induces non-plating. Therefore, the lower the oxygen, the better.
- the hot-dip galvanizing treatment may be performed according to a conventional method.
- the plating bath temperature is about 450 to 500 ° C, and the A1 concentration in the plating bath is 0.10 to 0.15 mass%. It is preferred that However, the above-mentioned plating conditions need to be changed depending on the components in the steel, but the difference in the plating conditions does not contribute to the effect of the present invention at all, and is not particularly limited.
- the method of adjusting the thickness of the plating layer after plating is not particularly limited, but gas wiping is generally used and is adjusted by the gas pressure of the gas wiping, the distance between the wiping nozzle and the steel plate, and the like. .
- the thickness of the plating layer is preferably in the range of 3 to 15 ⁇ . If it is less than 30, sufficient protection cannot be obtained.
- the alloying heat treatment after adjusting the plating thickness is not preferable because the effect of improving the fire resistance is saturated and the workability and economic efficiency tend to decrease. It can be performed by a method such as heating. However, the average rate of temperature rise to the alloying temperature must be 20 ° CZs or more. If the temperature is less than 20 ° CZs, the residence time in the low temperature range is long, and the alloying reaction is delayed, which hinders the formation of fine irregularities at the interface between the plating layer and the steel sheet.
- the heating rate during heating in the alloying treatment and the Si content in the base steel sheet are as follows (2). It is necessary to satisfy the formula. Record
- the heating rate during the alloying treatment is set to 20 ° C / s. Even above, fine irregularities at the interface between the plating layer of the present invention and the base steel sheet may not be formed, and it has been found that it is necessary to increase the heating rate according to the Si content.
- Figure 6 shows the effect of the Si content and the heating rate on the area ratio of fine irregularities in steel sheets containing one or more of Ti, Nb, and V as long as the above equation (3) is satisfied.
- FIG. It can be seen that satisfying the above equation (2) increases the area ratio of the fine recess to 10% or more.
- the alloying treatment time is not particularly limited, but the Fe content in the plating layer is preferably adjusted to 8 to 13% by mass. If the Fe content in the plating layer is less than 8% by mass, the above-mentioned Fe-Zn alloy phase is not sufficiently generated, and a soft 77-Zn phase remains on the plating surface layer, which impairs workability and adhesiveness. There are cases. On the other hand, if the Fe content in the plating layer exceeds 13% by mass, a hard and brittle Fe—Zn alloy phase (for example, ⁇ phase or ⁇ 1 phase) is excessively formed at the interface between the plating layer and the material steel sheet, This is a problem because it promotes the brittleness of the interface between the layer and the steel sheet.
- ⁇ phase or ⁇ 1 phase a hard and brittle Fe—Zn alloy phase
- the “Fe content in the plating layer” is the mass percentage of Fe in the plating layer with respect to the entire coating layer, and is the average Fe content.
- the method for measuring the Fe content in the plating layer can be measured, for example, by dissolving the alloyed hot-dip galvanized layer with hydrochloric acid containing an inhibitor, and then using an ICP (Inductively Coupled Plasma) emission spectroscopy.
- ICP Inductively Coupled Plasma
- the method of adjusting the Fe content in the plating layer to 8 to 13% by mass is not particularly limited, but is generally adjusted by the sheet temperature and the furnace time in the alloy heat treatment furnace.
- the time in the furnace is preferably shorter from the viewpoint of productivity. Specifically, the furnace is operated in about 5 to 30 seconds.
- the sheet temperature is selected in relation to the furnace time, but it is generally operated at 460 to 600 ° C.
- the temperature is lower than 460 ° C, alloying for a long time must be performed to adjust the Fe content in the plating layer to 8 to 13% by mass. A furnace is required. Therefore, the temperature is preferably 460 ° C or higher because there is a problem that productivity is lowered or huge facility costs are required.
- the temperature exceeds 600 ° C, an excessively thick hard and brittle Fe-Zn alloy phase (for example, ⁇ phase or ⁇ 1 phase) is formed at the interface between the plating layer and the material steel sheet.
- the temperature is preferably set to 600 ° C. or less, since it causes a problem that it becomes brittle and promotes the brittleness of the interface between the plating layer and the material steel sheet.
- the cooling method is not particularly limited, but it is desirable to perform rapid cooling of 30 ° C or more for up to 420 ° C at which the alloying reaction is completed, for example, conventional cooling such as gas cooling or mist cooling. It is sufficient to use a method that is available.
- a steel ingot having the chemical composition shown in Table 1 was heated to 1250 ° C and hot-rolled to remove black scale on the surface to obtain a hot-rolled steel sheet having a thickness of 2.0 mm.
- a primary heat treatment at 830 ° C was performed in a heating furnace in a nitrogen atmosphere to clean the surface and then used as a material steel sheet.
- Recrystallization annealing conditions and plating conditions are as follows.
- Atmosphere 5 vol% hydrogen + nitrogen (dew point: one 35 ° C)
- Oxygen concentration in the atmosphere immediately before plating the conditions described in Table 2 (remainder 5 vol% hydrogen + nitrogen (dew point: -35 ° C))
- the resulting plated steel sheet contained A1: 0.2 to 0.5% by mass and Fe: 0.5 to 2% by mass in the plating layer.
- an alloying treatment was performed in the atmosphere in an electric heating furnace. The heating rate and the alloying temperature during the alloying treatment were the conditions shown in Table 2.
- the cooling atmosphere after recrystallization annealing until plating the thickness of the plated layer, the rate of temperature rise, the temperature holding time in the alloying treatment, the Fe content in the plated layer, the plated layer Table 2 shows the proportion of fine irregularities formed at the interface between the steel plate and the steel sheet, and the developed area ratio Sdr.
- the method for evaluating the plating adhesion 1 of the obtained plated steel sheet is shown below, and the evaluation results are also shown in Table 2.
- the plating layer is removed by performing constant potential electrolysis in an alkaline solution containing NaOH, NaCl, and triethanolamine to reveal the interface between the plating layer and the material steel sheet.
- the surface shape was measured using the ERA-8800FE (Elionix) analyzer.
- the samples were coated with several tens of Au so as not to be affected by the surface composition, and used for measurement.
- the shape analysis measurement was performed at an accelerating voltage of 15 kV, and a 10,000-fold field of view (viewing area 12 / mx 9 ⁇ ⁇ ) was captured at a resolution of 1200 x 900 points, and data processing was performed. Expansion area ratio
- the Sdr value was obtained by averaging the results obtained by measuring three arbitrarily selected areas.
- the height direction calibration using this device is performed by the NIST, a national research institute in the United States. Standards (three steps: 18 nm, 88 nm, and 450 nm) were used. Furthermore, a high-pass filter with a cutoff wavelength of 0.5 / zm was used for calculation of three-dimensional shape parameters.
- the cross section of the obtained plated steel sheet was observed with an optical microscope (magnification: 400 times), and the thickness of the plating layer at any three points was measured. did.
- the plating layer of the obtained plated steel sheet is dissolved with hydrochloric acid containing an inhibitor, and Zn and Fe in the plating layer are quantitatively analyzed by ICP emission spectroscopy, and the mass percentage of Fe to (Zn + Fe) (mass) %) was taken as the Fe content in the plating layer.
- the tensile shear strength was evaluated as a ratio (%) to the strength when a tensile test was performed using a cold-rolled steel sheet (non-plated material) having the same steel composition and size. Evaluation criteria for tensile shear strength
- peeling at the interface between the plating layer and the material steel sheet means peeling at the interface between the plating layer and the material steel sheet. In some cases, it does not occur, so even if it peels off within 2 m or less from the interface between the plating layer and the material steel sheet to the plating layer side or to the material steel sheet side, it is assumed that it has separated at the interface between the plating layer and the material steel sheet.
- Test material Plating layer Material sales plate Plating adhesion 1
- the alloyed hot-dip galvanized steel sheet of the present invention (Example) has significantly increased interfacial strength between the plated layer and the steel sheet and improved plating adhesion compared to the conventional steel sheet (Comparative Example). You can see that it is doing.
- a steel ingot having the chemical composition shown in Table 3 was heated to 1250 ° C and hot rolled to remove black scale on the surface to obtain a hot-rolled steel sheet having a thickness of 2.0 mra.
- cold rolling was performed at a draft of 50% to obtain a cold-rolled steel sheet with a thickness of 1. Omm, a width of 70 mm and a length of 180 mm, and the surface was cleaned to obtain a material steel sheet.
- the steel sheet is immersed in 5% hydrochloric acid at 60 ° C for 10 seconds, pickled and then kept at 400 ° C for 1 second in a nitrogen atmosphere (dew point: + 20 ° C) containing 0.1vol% oxygen.
- Atmosphere 5 vol% hydrogen + nitrogen (dew point: one 35 ° C) Temperature: 830 ° C Hold time: 20 seconds
- the obtained plated steel sheet contained A1: 0.2 to 0.5% by mass and Fe: 0.5 to 2% by mass in the plating layer.
- an alloying treatment was performed in the atmosphere in an electric heating furnace. The heating rate and the alloying temperature during the alloying treatment were set to the conditions shown in Table 4.
- the cooling atmosphere after recrystallization annealing until plating, the thickness of the plated layer, the rate of temperature rise, the temperature holding time in the alloying treatment, the Fe content in the plated layer, the plated layer The existence ratio of fine irregularities formed at the interface between the steel plate and the material steel sheet, and the development area ratio Sdr were investigated in the same manner as in the method described in Example 1 above.
- the evaluation of the plating adhesion 2 shown below was also performed.
- Table 4 shows the results. The method for evaluating the plating adhesion of the obtained plated steel sheet is shown below, and the evaluation results are also shown in Table 4.
- test material 9 was placed in a concave mold 10 as shown in Fig. 8, and a test was performed in which the surface of the test material 9 was lowered by lowering the convex mold 11 and pushed by a load W. .
- the surface of the mold was polished with # 1200 abrasive paper to remove foreign substances adhering to the test every time.
- the indentation load P of the mold was set to 8 kN, and the speed of extracting the test material was set to 20 niin / s.
- the test material was slightly degreased, and cellophane tape (made of Nichipan, width: 24 mm) was applied to the sliding part with the mold, and the amount of Zn adhering to the cellophane tape when peeled off was counted by fluorescent X-ray It was measured as a number and evaluated according to the following criteria. ⁇ Evaluation criteria for plating adhesion 2>
- the alloyed hot-dip galvanized steel sheet of the present invention (Example) has significantly increased interfacial strength between the plated layer and the steel sheet and improved plating adhesion compared to the conventional steel sheet (Comparative Example). You can see that it is doing.
- a steel ingot having the chemical composition shown in Table 5 was heated to 1250 ° C and hot-rolled to remove black scale on the surface to obtain a hot-rolled steel sheet having a thickness of 2.0 ⁇ .
- cold rolling was performed at a rolling reduction of 65% to obtain a cold-rolled steel sheet with a thickness of 0.7 mm, and was cut into a width of 70 mm and a length of 180 mm.
- a primary heat treatment of 830 ° C was performed in a heating furnace in a nitrogen atmosphere containing 3 vol% hydrogen at 30 ° C. After the surface was cleaned, a steel sheet was obtained. The steel sheet was immersed in 5% hydrochloric acid at 60 ° C for 10 seconds, pickled, and then recrystallized and plated with a lab plating simulator. Recrystallization annealing conditions and plating conditions are as follows.
- Atmosphere 5 vol% hydrogen + nitrogen (dew point:-35 ° C)
- Oxygen concentration in the atmosphere immediately before plating the conditions shown in Table 6 (remainder 5 vol% hydrogen + nitrogen (dew point: _35.C))
- the obtained plated steel sheet contained A1: 0.2 to 0.5% by mass and Fe: 0.5 to 2% by mass in the plating layer.
- an alloying treatment was performed in the atmosphere in an electric heating furnace. The heating rate and the alloying temperature during the alloying treatment were set to the conditions shown in Table 6.
- a test piece of width: 40 mm, length: 100 mm was cut out from the obtained plated steel sheet, and cellophane tape (made by Nichiban, width: 24 mm) was attached at the position of length: 50 mm, and the tape face was bent inward by 90 °. Thereafter, the sheet was bent back and the cellophane tape was peeled off, and the amount of Zn attached when the cellophane tape was peeled off was measured as a count number by X-ray fluorescence. The measured Zn count was corrected to the number of counts per test specimen width: unit length (lm), and evaluated according to the following criteria.
- Specimens of width: 70mni, length: 150mm were cut out from the obtained plated steel sheet, immersed in gas-proof oil: 550KH (manufactured by Parker Kosan) and left standing for 24 hours in the air. And while holding both ends of the test material 13 between the die 14 and the wrinkle retainer 15 constituting the die 16 with a bead as shown in FIG. 9, press the punch 13 from the back of the test material 13 with the punch 17. A test for forming a U-shape was performed. In addition, the surface of the mold was cleaned with a polishing paper of # 1000 to remove foreign substances adhering to the polishing for each test. The wrinkle holding force P was 12 kN, and the punch speed was 100 mm / min.
- test material was slightly degreased, a cellophane tape (made of Nichipan, width: 24 mm) was stuck on the convex side, and the amount of Zn adhering to the cellophane tape when peeled off was measured as a count using fluorescent X-rays. Evaluation was made according to the following criteria.
- the alloyed hot-dip galvanized steel sheet of the present invention (Example) has significantly increased interfacial strength between the plated layer and the steel sheet and improved plating adhesion compared to the conventional steel sheet (Comparative Example). You can see that it is doing.
- the alloyed hot-dip galvanized steel sheet of the present invention is an alloyed hot-dip galvanized steel sheet with extremely excellent plating adhesion at the interface between the plating layer and the material steel sheet, which has never been seen before.
- the field there is no problem of peeling of the plating layer during processing, the appearance after processing is good, and sufficient heat resistance can be maintained. Therefore, it is possible to bring about an industrially useful effect that high strength and light weight can be achieved for components of all shapes.
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Abstract
Description
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Priority Applications (4)
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CA2498223A CA2498223C (en) | 2003-02-10 | 2004-02-05 | Galvannealed steel sheet excellent in coating adhesion and manufacturing method thereof |
AU2004209947A AU2004209947B2 (en) | 2003-02-10 | 2004-02-05 | Steel sheet plated by hot dipping with alloyed zinc with excellent adhesion and process for producing the same |
EP04708495.9A EP1595969B1 (en) | 2003-02-10 | 2004-02-05 | Galvannealed steel sheet excellent in coating adhesion and manufacturing method thereof |
US10/527,182 US20060057417A1 (en) | 2003-02-10 | 2004-02-05 | Steel sheet plated by hot dipping with alloyed zinc with excellent adhesion and process for producing the same |
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JP2003032321 | 2003-02-10 | ||
JP2004013269A JP4729850B2 (ja) | 2003-02-10 | 2004-01-21 | めっき密着性に優れた合金化溶融亜鉛めっき鋼板およびその製造方法 |
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ES2382811T3 (es) * | 2004-09-15 | 2012-06-13 | Nippon Steel Corporation | Procedimiento para producir una parte de alta resistencia |
JP2006274288A (ja) * | 2005-03-28 | 2006-10-12 | Jfe Steel Kk | 表面外観に優れた高強度溶融亜鉛系めっき鋼板 |
KR100711445B1 (ko) * | 2005-12-19 | 2007-04-24 | 주식회사 포스코 | 도금밀착성 및 충격특성이 우수한 열간성형 가공용 합금화용융아연도금강판의 제조방법, 이 강판을 이용한열간성형부품의 제조방법 |
JP4926814B2 (ja) * | 2007-04-27 | 2012-05-09 | 新日本製鐵株式会社 | 降伏点伸びを制御した高強度鋼板とその製造方法 |
EP2009129A1 (en) * | 2007-06-29 | 2008-12-31 | ArcelorMittal France | Process for manufacturing a galvannealed steel sheet by DFF regulation |
CN101910446B (zh) * | 2008-03-13 | 2013-09-04 | 蓝野钢铁有限公司 | 金属镀覆钢带 |
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- 2004-01-21 JP JP2004013269A patent/JP4729850B2/ja not_active Expired - Fee Related
- 2004-02-05 EP EP04708495.9A patent/EP1595969B1/en not_active Expired - Lifetime
- 2004-02-05 CA CA2498223A patent/CA2498223C/en not_active Expired - Fee Related
- 2004-02-05 WO PCT/JP2004/001209 patent/WO2004070075A1/ja active Application Filing
- 2004-02-05 US US10/527,182 patent/US20060057417A1/en not_active Abandoned
- 2004-02-05 KR KR1020057006326A patent/KR100675565B1/ko active IP Right Grant
- 2004-02-05 AU AU2004209947A patent/AU2004209947B2/en not_active Ceased
- 2004-02-10 TW TW093103023A patent/TW200424353A/zh unknown
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Also Published As
Publication number | Publication date |
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CA2498223C (en) | 2010-05-18 |
TW200424353A (en) | 2004-11-16 |
EP1595969B1 (en) | 2017-06-28 |
JP2004263295A (ja) | 2004-09-24 |
US20060057417A1 (en) | 2006-03-16 |
CA2498223A1 (en) | 2004-08-19 |
KR20050061533A (ko) | 2005-06-22 |
JP4729850B2 (ja) | 2011-07-20 |
EP1595969A1 (en) | 2005-11-16 |
EP1595969A4 (en) | 2010-02-03 |
KR100675565B1 (ko) | 2007-01-30 |
AU2004209947B2 (en) | 2006-12-14 |
AU2004209947A1 (en) | 2004-08-19 |
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