JP2022130469A - 被覆鋼板の製造方法 - Google Patents
被覆鋼板の製造方法 Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 87
- 239000010959 steel Substances 0.000 title claims abstract description 87
- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 12
- 238000000576 coating method Methods 0.000 claims abstract description 53
- 239000011248 coating agent Substances 0.000 claims abstract description 52
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 37
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 37
- 239000011701 zinc Substances 0.000 claims abstract description 28
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 26
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 26
- 229910052742 iron Inorganic materials 0.000 claims abstract description 19
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 13
- 229910052751 metal Inorganic materials 0.000 claims description 16
- 239000002184 metal Substances 0.000 claims description 16
- 238000010438 heat treatment Methods 0.000 claims description 11
- 238000003466 welding Methods 0.000 claims description 11
- 229910052782 aluminium Inorganic materials 0.000 claims description 9
- 229910001563 bainite Inorganic materials 0.000 claims description 8
- 229910000734 martensite Inorganic materials 0.000 claims description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 5
- 238000000137 annealing Methods 0.000 claims description 5
- 239000012535 impurity Substances 0.000 claims description 5
- 229910045601 alloy Inorganic materials 0.000 claims description 4
- 239000000956 alloy Substances 0.000 claims description 4
- 229910001566 austenite Inorganic materials 0.000 claims description 4
- 238000009792 diffusion process Methods 0.000 claims description 4
- 230000000717 retained effect Effects 0.000 claims description 4
- 229910000859 α-Fe Inorganic materials 0.000 claims description 4
- 239000000470 constituent Substances 0.000 claims description 3
- 229910001567 cementite Inorganic materials 0.000 claims description 2
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 claims description 2
- 229910001562 pearlite Inorganic materials 0.000 claims description 2
- 238000005246 galvanizing Methods 0.000 description 9
- 230000004888 barrier function Effects 0.000 description 5
- 238000000151 deposition Methods 0.000 description 4
- 238000004626 scanning electron microscopy Methods 0.000 description 4
- 229910001335 Galvanized steel Inorganic materials 0.000 description 3
- 238000004210 cathodic protection Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 239000008397 galvanized steel Substances 0.000 description 3
- 229910001338 liquidmetal Inorganic materials 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 229910052804 chromium Inorganic materials 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009713 electroplating Methods 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 238000000399 optical microscopy Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 229910052684 Cerium Inorganic materials 0.000 description 1
- 229910021328 Fe2Al5 Inorganic materials 0.000 description 1
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 1
- 229910001297 Zn alloy Inorganic materials 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 229910000905 alloy phase Inorganic materials 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000003618 dip coating Methods 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229910052746 lanthanum Inorganic materials 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 238000001771 vacuum deposition Methods 0.000 description 1
- 238000007738 vacuum evaporation Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/10—Spot welding; Stitch welding
-
- C—CHEMISTRY; METALLURGY
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- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/10—Spot welding; Stitch welding
- B23K11/11—Spot welding
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
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- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
- C21D9/48—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals deep-drawing sheets
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
-
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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
- 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
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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
- 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
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- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
- C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
- C23C2/0224—Two or more thermal pretreatments
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- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
- C23C2/026—Deposition of sublayers, e.g. adhesion layers or pre-applied alloying elements or corrosion protection
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- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
- C23C2/36—Elongated material
- C23C2/40—Plates; Strips
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- 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
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/02—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material
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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
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/02—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material
- C23C28/021—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material including at least one metal alloy layer
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- C25D7/00—Electroplating characterised by the article coated
- C25D7/06—Wires; Strips; Foils
- C25D7/0614—Strips or foils
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- C21—METALLURGY OF IRON
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- C21D2211/00—Microstructure comprising significant phases
- C21D2211/001—Austenite
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- C21D2211/008—Martensite
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Abstract
Description
-ベース鋼板を0.1-1.0g/m2のコーティング量のNi(CNi)でコーティングする工程、
-Ni被覆鋼板を還元雰囲気で加熱する工程、
-加熱された鋼板を、鋼板が亜鉛めっき浴に投入される温度(Xs)まで冷却する工程、及び
-有効Al濃度(CAI)が0.11~0.14wt%であり、440~460℃の温度(Tp)である亜鉛めっき浴に冷却された鋼板を投入し、浸漬する工程であって、鋼板が亜鉛めっき浴に投入される温度(Xs)が、CNi(Xs-Tp)/2CAl=5-100の関係を満たす工程
を含む。
B.このようなプレコート鋼板を、600~1000℃の温度で熱処理する工程、
C.工程B)で得られた鋼板を、亜鉛ベースの第2のコーティングで被覆する工程。
0.10<C<0.40%、
1.5<Mn<3.0%、
0.7<Si<2.0%、
0.05<Al<1.0%、
0.75<(Si+AI)<3.0%、
及び純粋に任意ベースで1つ以上の元素、例えば
Nb≦0.5%、
B≦0.005%、
Cr≦1.0%、
Mo≦0.50%、
Ni≦1.0%、
Ti≦0.5%、
を重量で含み、
残りの成分は、鉄を及び加工で生じる不可避の不純物で構成される。
-ベース鋼板を0.1-1.0g/m2のコーティング量のNi(CNi)でコーティングする工程、
-Ni被覆鋼板を還元雰囲気で加熱する工程、
-加熱された鋼板を、鋼板が亜鉛めっき浴に投入される温度(Xs)まで冷却する工程、及び
-有効Al濃度(C Al )が0.11~0.14wt%であり、440~460℃の温度(Tp)である亜鉛めっき浴に冷却された鋼板を投入し、浸漬する工程であって、鋼板が亜鉛めっき浴に投入される温度(Xs)が、CNi(Xs-Tp)/2CAl=5-100の関係を満たす工程
を含む。
0.10<C<0.40%、
1.5<Mn<3.0%、
0.7<Si<2.0%、
0.05<Al<1.0%、
0.75<(Si+Al)<3.0%、
及び純粋に任意ベースで1つ以上の元素、例えば
Nb≦0.5%、
B≦0.005%、
Cr≦1.0%、
Mo≦0.50%、
Ni≦1.0%、
Ti≦0.5%、
を重量で含み、
残りの成分は、鉄を及び加工で生じる不可避の不純物で構成される。
Claims (30)
- 被覆鋼板の製造方法であって、以下の工程
A.鉄及びニッケルを含む第1のコーティングで被覆されたプレコート鋼板を準備する工程と、
B.このようなプレコート鋼板を600~1000℃の温度で熱処理する工程と、
C.工程B)で得られた前記鋼板を、亜鉛ベースの第2のコーティングで被覆する工程と、
を含む方法。 - 工程A)において、第1のコーティングが、10%~75重量%の鉄を含む、請求項1に記載の方法。
- 工程A)において、第1のコーティングが、25~65重量%の鉄を含む、請求項2に記載の方法。
- 工程A)において、第1のコーティングが、40~60%の重量の鉄を含む、請求項1~3のいずれか一項に記載の方法。
- 工程A)において、第1のコーティングが、25~90重量%のニッケルを含む、請求項1~4のいずれか一項に記載の方法。
- 工程A)において、第1のコーティングが、35~75重量%のニッケルを含む、請求項5に記載の方法。
- 工程A)において、第1のコーティングが、40~60重量%のニッケルを含む、請求項6に記載の方法。
- 工程A)において、第1のコーティングが、鉄及びニッケルからなる、請求項1~7のいずれか一項に記載の方法。
- 工程A)において、第1のコーティングが、0.5μm以上の厚さを有する、請求項1~8のいずれか一項に記載の方法。
- 工程A)において、第1のコーティングが、0.8~5.0μmの厚さを有する、請求項9に記載の方法。
- 工程A)において、第1のコーティングが、1.0~2.0μmの厚さを有する、請求項10に記載の方法。
- 工程A)において、鋼板の成分が、
0.10<C<0.40%、
1.5<Mn<3.0%、
0.7<Si<2.0%、
0.05<Al<1.0%、
0.75<(Si+AI)<3.0%、
及び純粋に任意ベースで1つ以上の元素、例えば
Nb≦0.5%、
B≦0.005%、
Cr≦1.0%、
Mo≦0.50%、
Ni≦1.0%、
Ti≦0.5%、
を含み、
残りの成分が、鉄及び加工で生じる不可避の不純物で構成される、請求項1~11のいずれか一項に記載の方法。 - 工程C)において、第2の層が、50%超の亜鉛を含む、請求項1~12のいずれか一項に記載の方法。
- 工程C)において、第2の層が、75%超の亜鉛を含む、請求項13に記載の方法。
- 工程C)において、第2の層が、90%超の亜鉛を含む、請求項14に記載の方法。
- 工程C)において、第2の層が、亜鉛からなる、請求項15に記載の方法。
- 工程B)において、熱処理が、連続焼鈍である、請求項1~16のいずれか一項に記載の方法。
- 工程B)において、熱処理が、-10~-60℃の露点で、H2を1~30%含む雰囲気中で行われる、請求項1~17のいずれか一項に記載の方法。
- 請求項1~18のいずれか一項に記載の方法から得られる鋼板であって、鉄及びニッケルを含む拡散合金層で被覆され、そのような層が、亜鉛ベースの層によって直接覆われる鋼板。
- 鋼の微細構造が、1~50%の残留オーステナイト、1~60%のマルテンサイト、並びに任意にベイナイト、フェライト、セメンタイト及びパーライトから選択される少なくとも1つの成分を含む、請求項19に記載の鋼板。
- 微細構造が、5~25%の残留オーステナイトを含む、請求項20に記載の鋼板。
- 微細構造が、1~60%の焼戻しマルテンサイトを含む、請求項20又は21に記載の鋼板。
- 微細構造が、10~40%のベイナイトを含む、請求項20~22のいずれか一項に記載の鋼板。
- 微細構造が、1~25%のフェライトを含む、請求項20~23のいずれか一項に記載の鋼板。
- 微細構造が、1~15%の非焼戻しマルテンサイトを含む、請求項20~24のいずれか一項に記載の鋼板。
- 請求項19~25のいずれか一項に記載の鋼板、又は請求項1~18のいずれか一項に記載の方法から得られる鋼板を少なくとも1枚含む、少なくとも2枚の金属板のスポット溶接継手であって、前記継手に含まれる100μm超のサイズのクラックの数が、3つ未満であり、最長のクラックの長さが、500μm未満である、スポット溶接継手。
- 2枚目の金属板が、鋼板又はアルミニウム板である、請求項26に記載のスポット溶接継手。
- 2枚目の金属板が、請求項19~25のいずれか一項に記載の鋼板、又は請求項1~18に記載の方法から得られる鋼板である、請求項27に記載のスポット溶接継手。
- 鋼板又はアルミニウム板である3枚目の金属板を含む、請求項26~28のいずれか一項に記載のスポット溶接継手。
- 請求項19~25のいずれか一項に記載の被覆鋼板、又は請求項26~29のいずれか一項に記載のスポット溶接点の、自動車両用部品の製造のための使用。
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