WO2022176851A1 - ホットスタンプ用めっき鋼板およびホットスタンプ成形体の製造方法、ならびにホットスタンプ成形体 - Google Patents
ホットスタンプ用めっき鋼板およびホットスタンプ成形体の製造方法、ならびにホットスタンプ成形体 Download PDFInfo
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- steel sheet
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- zinc plating
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 54
- 239000010959 steel Substances 0.000 title claims abstract description 54
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 29
- 238000007747 plating Methods 0.000 claims abstract description 77
- 239000011701 zinc Substances 0.000 claims abstract description 60
- 238000000227 grinding Methods 0.000 claims abstract description 51
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 36
- 239000000463 material Substances 0.000 claims abstract description 35
- 238000000034 method Methods 0.000 claims abstract description 35
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 34
- 238000005246 galvanizing Methods 0.000 claims abstract description 27
- 238000001816 cooling Methods 0.000 claims abstract description 18
- 239000010410 layer Substances 0.000 claims description 93
- 238000010438 heat treatment Methods 0.000 claims description 26
- 239000000126 substance Substances 0.000 claims description 15
- 239000000203 mixture Substances 0.000 claims description 12
- 239000002344 surface layer Substances 0.000 claims description 10
- 230000015572 biosynthetic process Effects 0.000 claims description 9
- 238000000465 moulding Methods 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 abstract description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract 1
- 230000008021 deposition Effects 0.000 abstract 1
- 241000239290 Araneae Species 0.000 description 17
- 230000007547 defect Effects 0.000 description 15
- 239000011248 coating agent Substances 0.000 description 14
- 238000000576 coating method Methods 0.000 description 14
- 238000005259 measurement Methods 0.000 description 12
- 239000000758 substrate Substances 0.000 description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 9
- 238000010828 elution Methods 0.000 description 9
- 230000002787 reinforcement Effects 0.000 description 7
- 229910001335 Galvanized steel Inorganic materials 0.000 description 5
- 239000010960 cold rolled steel Substances 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 5
- 238000009792 diffusion process Methods 0.000 description 5
- 239000008397 galvanized steel Substances 0.000 description 5
- 238000004070 electrodeposition Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 229910000765 intermetallic Inorganic materials 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 238000005275 alloying Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000011247 coating layer Substances 0.000 description 3
- 239000012141 concentrate Substances 0.000 description 3
- 239000003973 paint Substances 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 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
- 238000002441 X-ray diffraction Methods 0.000 description 2
- 239000006061 abrasive grain Substances 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000000112 cooling gas Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005485 electric heating Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000005554 pickling Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000004993 emission spectroscopy Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000004020 luminiscence type Methods 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000007591 painting process Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- LRXTYHSAJDENHV-UHFFFAOYSA-H zinc phosphate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O LRXTYHSAJDENHV-UHFFFAOYSA-H 0.000 description 1
- 229910000165 zinc phosphate Inorganic materials 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/20—Deep-drawing
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/26—After-treatment
-
- 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
Definitions
- the present invention relates to a plated steel sheet for hot stamping, a method for producing a hot stamped product, and a hot stamped product.
- iron oxide scale is generated on the surface of the steel sheet during heating. This oxide scale not only peels off during forming and wears the mold, but also causes flaws on the surface of the steel sheet. In addition, if oxide scale remains on the surface of the steel sheet after forming, it may cause poor welding in the subsequent welding process or poor paint adhesion in the painting process.
- JP-A-2003-126921 Japanese Patent Application Laid-Open No. 2005-240072 JP 2006-022395 A Japanese Patent Application Laid-Open No. 2007-182608 JP 2011-117086 A JP 2015-094006 A
- the plating bath contains A small amount of Al should be included.
- spider web-like surface defects may occur after heating and molding.
- This spider web-like surface defect is a convex defect, and it is not preferable in terms of quality because it may stand out on the surface even after coating for automobiles.
- the present invention solves the above problems and provides a method for producing a hot stamping plated steel sheet and a hot stamped product that can suppress spider web-like surface defects when using Al-containing Zn plating. and to provide a hot-stamped article.
- the present invention has been made to solve the above problems, and the gist of the present invention is the following hot stamping plated steel sheet, method for producing a hot stamped product, and hot stamped product.
- a hot-dip galvanizing step of forming a galvanized layer on the surface of the base material to form a plated steel sheet A surface grinding step of surface grinding the plated steel sheet; A hot stamping step in which the plated steel sheet after the surface grinding is heated and then formed and quenched at the same time, In the hot dip galvanizing process, After the formation of the zinc plating layer, the average cooling rate during the cooling of the surface temperature of the zinc plating layer to 400 ° C.
- the Mn content in the base material is more than 1.3% by mass;
- the Mn content in the base material is more than 1.3% by mass;
- the inventors of the present invention have obtained the following knowledge as a result of investigating the cause of the occurrence of spider web-like surface defects.
- Mn or the like in the plating flows into gaps caused by cracks in the oxide layer, and these oxides fill the gaps, causing spider web-like color unevenness and degrading the surface properties.
- the inventors have made extensive studies on methods for suppressing surface defects caused by cracks in the oxide layer, and have come up with the following ideas.
- Mn is contained in the plating by eluting from the base material, and diffuses from there to the plating surface. Local cracks in the oxide layer cause local Mn enrichment, which causes spider web-like color shading.
- the Mn eluted in the plating flows into the gaps between the finely crushed oxide layers and uniformly concentrates on the plating surface, making it possible to suppress spider web-like color unevenness.
- a method for producing a plated steel sheet for hot stamping according to one embodiment of the present invention includes a hot-dip galvanizing step and a surface grinding step. Moreover, you may further provide a base material manufacturing process. Each step will be described in detail below.
- the base material of the plated steel sheet for hot stamping is manufactured.
- molten steel having a predetermined chemical composition is produced, and using this molten steel, slabs are produced by casting or ingots are produced by ingot casting. Then, the slab or ingot is hot-rolled to obtain a base material (hot-rolled sheet).
- the base material may be a cold-rolled sheet obtained by subjecting the hot-rolled sheet to a pickling treatment and surface-grinding the hot-rolled sheet after the pickling treatment. Furthermore, the hot-rolled annealed sheet or the cold-rolled annealed sheet obtained by annealing the above hot-rolled sheet or cold-rolled sheet may be used as the base material.
- the Mn content in the substrate is preferably more than 1.3% by mass. It is more preferably 5% or more. Although it is not necessary to set an upper limit for the Mn content, it is preferably 3.0% or less, more preferably 2.7% or less.
- a galvanized steel sheet is formed by forming a galvanized layer on the surface of the base material.
- the galvanized layer can be formed, for example, by hot dip plating.
- an example of forming a galvanized layer by hot-dip plating is as follows. That is, the substrate is immersed in a hot dip galvanizing bath containing Zn, Al and impurities to deposit a galvanized layer on the surface of the substrate.
- the chemical composition of the hot-dip galvanizing bath is mainly Zn. Specifically, the Zn content is 90% by mass or more.
- the temperature of the plating bath is generally 440-470°C, more preferably 450-460°C.
- the Al content of the hot dip galvanizing bath is preferably 0.05 to 0.50%, more preferably 0.10 to 0.30%, and 0.12 to 0.20%. is more preferred.
- the Al content in the galvanized layer is slightly higher than the Al content in the plating bath, depending on the type of steel sheet or plating conditions. At this time, since the state of formation of Al oxide on the plating surface varies depending on the Al content in the zinc plating layer, in the present invention, the Al content in the zinc plating layer is used instead of the Al content in the plating bath. It is necessary to adjust the grinding amount.
- the Al content in the galvanized layer is 0.15 to 0.70% by mass, preferably 0.15 to 0.60%, and preferably 0.20 to 0.50%. more preferred.
- Fluorescent X-ray analysis is used for in-line measurement as a method for measuring the Al content in the galvanized layer. Specifically, using a predetermined plated steel sheet in advance, the relationship between the Al measurement value obtained by fluorescent X-ray analysis and the Al content measured by ICP emission spectrometry after dissolving the galvanized layer in dilute hydrochloric acid is derived. . Then, the plated steel sheet to be measured is irradiated with fluorescent X-rays to obtain an Al measurement value, and the Al content is obtained from the above relationship.
- the hot-dip galvanizing bath may additionally contain Mg, Pb, Si, etc., but the total content of these is preferably 10% by mass or less.
- the substrate with the galvanized layer attached is pulled out of the plating bath.
- the thickness of the galvanized layer can be adjusted by appropriately adjusting the speed at which the steel sheet is lifted from the plating bath and the flow rate and velocity of the wiping gas.
- the flow velocity of the wiping gas is preferably 10 m/s or more, for example.
- the substrate is pulled out of the plating bath, the thickness of the galvanized layer is adjusted, and after the galvanized layer is formed, it is cooled until the galvanized layer solidifies. If the cooling rate at this time is low, as described above, the Fe—Al intermetallic compound layer is formed thickly near the interface with the base material in the galvanized layer, and the elution of Mn from the base material is significantly inhibited. be.
- the average cooling rate during the period from the formation of the galvanized layer until the surface temperature of the galvanized layer cools to 400°C is set to 10°C/s or more.
- the average cooling rate is preferably 15° C./s or higher, more preferably 20° C./s or higher. There is no need to put an upper limit on the average cooling rate.
- the cooling rate after plating is often adjusted by blowing cooling gas or mist. If the spraying speed at this time is excessive, it may cause uneven appearance. Therefore, the cooling rate after plating is preferably 30° C./s or less, more preferably 25° C./s or less.
- the coating weight of the zinc coating layer formed on the substrate surface is 65 to 150 g/m 2 in terms of Zn content.
- a hot-stamped article having excellent corrosion resistance can be produced by making the coating thick.
- the effect of the present invention is remarkably exhibited when the coating weight of the zinc coating layer is 65 g/m 2 or more in terms of Zn content.
- the coating weight of the zinc coating layer exceeds 150 g/m 2 in terms of Zn content, it becomes extremely difficult to suppress the flow of the plating liquid phase caused by heating during hot stamping.
- the coating weight of the zinc plating layer in terms of Zn content, is preferably over 100 g/m 2 , more preferably 110 g/m 2 or more, and preferably 130 g/m 2 or less.
- the problem of spider web-like surface defects occurs when hot-stamping a hot-dip galvanized steel sheet that has been solidified without being alloyed after plating.
- An alloyed hot-dip galvanized steel sheet that is further alloyed after hot-dip galvanizing treatment does not have such a problem, and is not the object of the present embodiment. That is, alloying treatment is not performed in the hot-dip galvanizing treatment step in this embodiment.
- the grinding amount G (g/m 2 ) is subjected to surface grinding under conditions satisfying the following formula (ii) in relation to L defined by the following formula (i).
- M in the formula (i) is the coating weight (g/m 2 ) in terms of the Zn content of the galvanized layer
- A is the Al content (% by mass) in the galvanized layer.
- the grinding amount G is set to 10 L or less, preferably 5 L or less.
- the amount of grinding can be obtained from the change in weight of a steel plate of a given size before and after grinding. Also, the amount of grinding can be controlled by changing the type of brush used for grinding, the rotation speed, the pressing force against the steel plate, the difference in the opposing speed with respect to the steel plate, and the like. Specifically, it is preferable that the opposing speed difference between the brush used for grinding and the steel plate is 50 mpm or more.
- a brush with a hard plastic wire containing abrasive grains such as ceramics on a steel core is used.
- the grain size of the abrasive grains is preferably 1 mm or less in diameter.
- the method for manufacturing a hot-stamped article according to one embodiment of the present invention further includes a hot stamping step in addition to the hot-dip galvanizing step and surface grinding step described above.
- the hot stamping process will be described in detail below.
- the hot stamping process In the hot stamping process, the plated steel sheet after surface grinding is heated, and then formed and quenched at the same time. There are no particular restrictions on the heating conditions in the hot stamping process.
- the maximum temperature reached during heating can be, for example, Ac 3 point to 950°C. By setting the maximum temperature to Ac 3 or more, the base material becomes austenite during heating, and a sufficient quenching effect can be obtained.
- the highest temperature is 950° C. or lower, preferably 900° C. or lower, more preferably 890° C. or lower, and even more preferably 870° C. or lower.
- the heating rate there are no particular restrictions on the heating rate, and rapid heating is desired from the viewpoint of reducing manufacturing costs.
- the average heating rate is preferably less than 20 ° C./s, and 18 ° C./s. It is more preferable to set the following average heating rate.
- the temperature mentioned above means the surface temperature of the steel sheet.
- the most accurate method is to attach a thermocouple to the material.
- traces of attaching thermocouples remain, which is not preferable.
- the heat pattern is measured in advance with a dummy material with a thermocouple attached for each part shape, plate thickness, and plating weight, and the heating conditions of the furnace are set so that the heat pattern suitable for the present invention can be reproduced.
- heating can be performed under conditions suitable for the present invention.
- thermometer As a method other than using a thermocouple, it is also possible to install a radiation thermometer in the furnace, set the conditions in advance, and measure the emissivity with a radiation thermometer that has a specified emissivity. Strictly speaking, the emissivity varies depending on the state of the surface of the material, but in the case of this material, if it is set to about 0.5, it is possible to measure temperature with the effect of the present invention.
- the heated galvanized steel sheet is press-molded using a mold.
- the steel plate is quenched by a die.
- a cooling medium for example, water
- a compact can be produced by the above steps.
- a hot-stamped article according to one embodiment of the present invention has a galvanized layer with a thickness of 1 ⁇ m or more on the surface of a substrate.
- the chemical composition in the surface layer region from the surface of the galvanized layer to a depth of 1 ⁇ m satisfies the following formula (iii). Mn/Al ⁇ 5.0 (iii)
- the symbol of each element in the above formula represents the content (% by mass) of each element in the surface layer region of the galvanized layer.
- the left-side value of the above formula (iii) is preferably 12.0 or more.
- 20.0 is a substantial upper limit when the Mn content in the substrate is 3.0% or less.
- the thickness of the galvanized layer after hot stamping is usually 10 ⁇ m or more.
- the thickness of the galvanized layer is preferably 16 ⁇ m or more, more preferably 18 ⁇ m or more or 20 ⁇ m or more.
- the thickness of the galvanized layer is preferably 37 ⁇ m or less, more preferably 35 ⁇ m or less or 32 ⁇ m or less.
- the chemical composition in the surface region of the galvanized layer and the thickness of the galvanized layer can be measured with a high-frequency glow discharge luminescence surface spectrometer (GDS). Specifically, the measurement is performed according to the following procedure.
- GDS glow discharge luminescence surface spectrometer
- the chemical composition is measured in the depth direction, and the depth until the Zn content becomes 15% or less is determined. Then, the average depth at each measurement point is obtained, and the average value is taken as the thickness of the galvanized layer.
- a GDS850A device manufactured by LECO Japan may be used, and the measurement conditions may be 30 W, 1000 V, an argon pressure of 0.27 MPa, and a measurement diameter of 4 mm ⁇ .
- Three types of cold-rolled steel sheets having a thickness of 1.0 mm and a Mn content of 1.3%, 1.5%, or 2.0% by mass were prepared.
- the chemical compositions other than the Mn content of these cold-rolled steel sheets are C: 0.21%, Si: 0.2%, P: 0.01%, S: 0.007%, Cr: 0.2 %, Ti: 0.02%, B: 0.003%, balance: Fe and impurities.
- the Ac 3 points of the above cold-rolled steel sheets depended on the heating rate and the Mn content, but all were within the range of about 810 to 840°C.
- the above cold-rolled steel sheets were annealed by a continuous hot-dip galvanizing line and then plated under the conditions shown in Table 1 to obtain plated steel sheets.
- the plating bath composition was Al content: 0.13% by mass, the balance: Zn, and the plating bath temperature was 460°C. After plating, the jetting distance and flow rate of the wiping gas and the cooling gas were adjusted to variously adjust the average cooling rate until the temperature of the surface of the galvanized layer reached 400°C.
- the obtained plated steel sheet was further subjected to surface grinding under the conditions shown in Table 1. After that, the plated steel sheet of each test example was cut into a size of 100 mm square, heated to 900 ° C. at the average heating rate shown in Table 1 using an electric heating furnace in an air atmosphere, and then water cooling pipes were quickly incorporated. It was sandwiched between plate presses and quenched to obtain a hot-stamped product.
- the chemical composition in the surface layer region of the galvanized layer was measured by the method described above, and the Mn/Al value was calculated.
- the thickness of the galvanized layer was 10 ⁇ m or more.
- the evaluation criteria are F when the spider web-like defect is very clearly visible on the surface of the molded body, C when it is faintly visible and visible even after chemical electrodeposition, and slightly visible but visible after chemical electrodeposition. B was given when it was absent, and A was given when it was not visible even before chemical electrodeposition. In the present example, C or higher was regarded as acceptable.
- corrosion resistance was evaluated by a coating film adhesion test by immersion in hot salt water. After hot stamping, the test material was subjected to zinc phosphate treatment using PBL-3080 manufactured by Nihon Parkerizing Co., Ltd. under normal chemical conversion treatment conditions, and then electrodeposition paint GT-10 manufactured by Kansai Paint Co., Ltd. was electrodeposited at a slope current of 200V. It was painted and baked at a baking temperature of 150° C. for 20 minutes. The coating thickness was 20 ⁇ m. After immersing the sample in a 5% NaCl aqueous solution at 50 ° C. for 500 hours, the coating was subjected to a tape peeling test. If 5% or more peeling occurred, the corrosion resistance was poor, and 1% or more and less than 5% was C. , B when over 0% and less than 1%, and A when 0%. In this example, B or higher was regarded as acceptable.
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Abstract
Description
前記めっき鋼板に対して表面研削を施す表面研削工程と、を備え、
前記溶融亜鉛めっき処理工程では、
前記亜鉛めっき層を形成してから、前記亜鉛めっき層の表面の温度が400℃まで冷却する間の平均冷却速度を10℃/s以上とし、
前記亜鉛めっき層のめっき付着量を、Zn含有量において、65~150g/m2とし、かつ、前記亜鉛めっき層中のAl含有量を、質量%で、0.15~0.70%とし、
前記表面研削工程では、前記亜鉛めっき層のZn含有量換算でのめっき付着量をM、前記亜鉛めっき層中のAl含有量をAとした時に、研削量G(g/m2)が、下記(i)式で定義されるLとの関係において、下記(ii)式を満足する条件で表面研削を施す、
ホットスタンプ用めっき鋼板の製造方法。
L=0.0048×A×M+0.138 ・・・(i)
L≦G≦10L ・・・(ii)
上記(1)に記載のホットスタンプ用めっき鋼板の製造方法。
前記めっき鋼板に対して表面研削を施す表面研削工程と、
前記表面研削を施した後の前記めっき鋼板を加熱し、その後に、成形および焼入れを同時に行うホットスタンプ工程と、を備え、
前記溶融亜鉛めっき処理工程では、
前記亜鉛めっき層を形成してから、前記亜鉛めっき層の表面の温度が400℃まで冷却する間の平均冷却速度を10℃/s以上とし、
前記亜鉛めっき層のめっき付着量を、Zn含有量において、65~150g/m2とし、かつ、前記亜鉛めっき層中のAl含有量を、質量%で、0.15~0.70%とし、
前記表面研削工程では、前記亜鉛めっき層のZn含有量換算でのめっき付着量をM、前記亜鉛めっき層中のAl含有量をAとした時に、研削量G(g/m2)が、下記(i)式で定義されるLとの関係において、下記(ii)式を満足する条件で表面研削を施す、
ホットスタンプ成形体の製造方法。
L=0.0048×A×M+0.138 ・・・(i)
L≦G≦10L ・・・(ii)
上記(3)に記載のホットスタンプ成形体の製造方法。
上記(3)または(4)に記載のホットスタンプ成形体の製造方法。
前記亜鉛めっき層中のAl含有量が、質量%で、0.15~0.70%であり、
前記亜鉛めっき層の表面から深さ1μmまでの表層領域における化学組成が、下記(iii)式を満足する、
ホットスタンプ成形体。
Mn/Al≧5.0 ・・・(iii)
但し、上記式中の元素記号は、前記表層領域中における各元素の含有量(質量%)を表す。
上記(6)に記載のホットスタンプ成形体。
本発明の一実施形態に係るホットスタンプ用めっき鋼板の製造方法は、溶融亜鉛めっき処理工程および表面研削工程を備える。また、基材製造工程をさらに備えてもよい。以下、各工程について、詳述する。
基材製造工程では、ホットスタンプ用めっき鋼板の基材を製造する。例えば、所定の化学組成を有する溶鋼を製造し、この溶鋼を用いて、鋳造法によりスラブを製造するか、または、造塊法によりインゴットを製造する。次いで、スラブまたはインゴットを熱間圧延することにより、基材(熱延板)が得られる。
溶融亜鉛めっき処理工程では、上記の基材の表面に亜鉛めっき層を形成してめっき鋼板とする。亜鉛めっき層は、例えば、溶融めっき処理を行うことにより形成することができる。
表面研削工程では、亜鉛めっき層が形成されためっき鋼板に対して、表面研削を施す。これにより、亜鉛めっき層の表面に形成された薄いAlを含む酸化物層の一部を除去し、残存部分についても細かく破砕する。
L=0.0048×A×M+0.138 ・・・(i)
L≦G≦10L ・・・(ii)
本発明の一実施形態に係るホットスタンプ成形体の製造方法は、上述の溶融亜鉛めっき処理工程および表面研削工程に加えて、ホットスタンプ工程をさらに備える。以下、ホットスタンプ工程について詳しく説明する。
ホットスタンプ工程では、表面研削を施した後のめっき鋼板を加熱し、その後に、成形および焼入れを同時に行う。ホットスタンプ工程での加熱条件については、特に制限はない。加熱する際の最高到達温度は、例えば、Ac3点~950℃とすることができる。最高到達温度をAc3点以上とすることで、加熱時に基材がオーステナイト化し、十分な焼入れ効果が得られる。
次に、上述の方法で製造されるホットスタンプ成形体について説明する。本発明の一実施形態に係るホットスタンプ成形体は、基材の表面に厚さ1μm以上の亜鉛めっき層を有する。そして、亜鉛めっき層の表面から深さ1μmまでの表層領域における化学組成が、下記(iii)式を満足する。
Mn/Al≧5.0 ・・・(iii)
但し、上記式中の元素記号は、亜鉛めっき層の表層領域中における各元素の含有量(質量%)を表す。
Claims (7)
- 基材の表面に亜鉛めっき層を形成してめっき鋼板とする溶融亜鉛めっき処理工程と、
前記めっき鋼板に対して表面研削を施す表面研削工程と、を備え、
前記溶融亜鉛めっき処理工程では、
前記亜鉛めっき層を形成してから、前記亜鉛めっき層の表面の温度が400℃まで冷却する間の平均冷却速度を10℃/s以上とし、
前記亜鉛めっき層のめっき付着量を、Zn含有量において、65~150g/m2とし、かつ、前記亜鉛めっき層中のAl含有量を、質量%で、0.15~0.70%とし、
前記表面研削工程では、前記亜鉛めっき層のZn含有量換算でのめっき付着量をM、前記亜鉛めっき層中のAl含有量をAとした時に、研削量G(g/m2)が、下記(i)式で定義されるLとの関係において、下記(ii)式を満足する条件で表面研削を施す、
ホットスタンプ用めっき鋼板の製造方法。
L=0.0048×A×M+0.138 ・・・(i)
L≦G≦10L ・・・(ii) - 前記基材中のMn含有量が、質量%で、1.3%超である、
請求項1に記載のホットスタンプ用めっき鋼板の製造方法。 - 基材の表面に亜鉛めっき層を形成してめっき鋼板とする溶融亜鉛めっき処理工程と、
前記めっき鋼板に対して表面研削を施す表面研削工程と、
前記表面研削を施した後の前記めっき鋼板を加熱し、その後に、成形および焼入れを同時に行うホットスタンプ工程と、を備え、
前記溶融亜鉛めっき処理工程では、
前記亜鉛めっき層を形成してから、前記亜鉛めっき層の表面の温度が400℃まで冷却する間の平均冷却速度を10℃/s以上とし、
前記亜鉛めっき層のめっき付着量を、Zn含有量において、65~150g/m2とし、かつ、前記亜鉛めっき層中のAl含有量を、質量%で、0.15~0.70%とし、
前記表面研削工程では、前記亜鉛めっき層のZn含有量換算でのめっき付着量をM、前記亜鉛めっき層中のAl含有量をAとした時に、研削量G(g/m2)が、下記(i)式で定義されるLとの関係において、下記(ii)式を満足する条件で表面研削を施す、
ホットスタンプ成形体の製造方法。
L=0.0048×A×M+0.138 ・・・(i)
L≦G≦10L ・・・(ii) - 前記基材中のMn含有量が、質量%で、1.3%超である、
請求項3に記載のホットスタンプ成形体の製造方法。 - 前記ホットスタンプ工程では、20℃/s未満の平均加熱速度でAc3点~950℃の温度範囲まで加熱する、
請求項3または請求項4に記載のホットスタンプ成形体の製造方法。 - 基材の表面に厚さ1μm以上の亜鉛めっき層を有し、
前記亜鉛めっき層中のAl含有量が、質量%で、0.15~0.70%であり、
前記亜鉛めっき層の表面から深さ1μmまでの表層領域における化学組成が、下記(iii)式を満足する、
ホットスタンプ成形体。
Mn/Al≧5.0 ・・・(iii)
但し、上記式中の元素記号は、前記表層領域中における各元素の含有量(質量%)を表す。 - 前記基材中のMn含有量が、質量%で、1.3%超である、
請求項6に記載のホットスタンプ成形体。
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