JP2022091820A - 液体金属脆化耐性のある、合金化溶融亜鉛めっき鋼板製造のための方法 - Google Patents
液体金属脆化耐性のある、合金化溶融亜鉛めっき鋼板製造のための方法 Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 93
- 239000010959 steel Substances 0.000 title claims abstract description 93
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 13
- 229910001338 liquidmetal Inorganic materials 0.000 title abstract description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 41
- 238000000576 coating method Methods 0.000 claims abstract description 40
- 239000011248 coating agent Substances 0.000 claims abstract description 38
- 239000011701 zinc Substances 0.000 claims abstract description 37
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 35
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 35
- 238000010438 heat treatment Methods 0.000 claims abstract description 18
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 15
- 238000000137 annealing Methods 0.000 claims abstract description 14
- 239000000203 mixture Substances 0.000 claims abstract description 9
- 238000005275 alloying Methods 0.000 claims abstract description 8
- 239000012535 impurity Substances 0.000 claims abstract description 7
- 229910001335 Galvanized steel Inorganic materials 0.000 claims description 17
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 17
- 239000008397 galvanized steel Substances 0.000 claims description 17
- 229910052751 metal Inorganic materials 0.000 claims description 12
- 239000002184 metal Substances 0.000 claims description 12
- 229910045601 alloy Inorganic materials 0.000 claims description 11
- 239000000956 alloy Substances 0.000 claims description 11
- 229910052782 aluminium Inorganic materials 0.000 claims description 9
- 229910052739 hydrogen Inorganic materials 0.000 claims description 9
- 229910052742 iron Inorganic materials 0.000 claims description 8
- 238000009792 diffusion process Methods 0.000 claims description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 2
- 238000007670 refining Methods 0.000 claims description 2
- 238000003466 welding Methods 0.000 abstract description 17
- 239000010410 layer Substances 0.000 description 40
- 238000007747 plating Methods 0.000 description 8
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 6
- 238000005246 galvanizing Methods 0.000 description 6
- 229910001297 Zn alloy Inorganic materials 0.000 description 5
- 229910001563 bainite Inorganic materials 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000005336 cracking Methods 0.000 description 4
- 238000005755 formation reaction Methods 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 229910018605 Ni—Zn Inorganic materials 0.000 description 3
- 229910000905 alloy phase Inorganic materials 0.000 description 3
- 229910001566 austenite Inorganic materials 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000009713 electroplating Methods 0.000 description 3
- 229910052748 manganese Inorganic materials 0.000 description 3
- 229910000734 martensite Inorganic materials 0.000 description 3
- 239000000155 melt Substances 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 229910000937 TWIP steel Inorganic materials 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 238000001771 vacuum deposition Methods 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 229910018137 Al-Zn Inorganic materials 0.000 description 1
- 229910018573 Al—Zn Inorganic materials 0.000 description 1
- 229910052684 Cerium Inorganic materials 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 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
- 238000004210 cathodic protection Methods 0.000 description 1
- 229910001567 cementite Inorganic materials 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 1
- 229910052746 lanthanum Inorganic materials 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
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- C21D8/0273—Final recrystallisation annealing
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- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
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Abstract
Description
―オーステナイト分率が90面積%以上である微細構造を有する素地鋼板と、
―素地鋼板上に形成される溶融亜鉛めっき層と、を含み、
溶融亜鉛めっき層は、Fe-Zn合金層と、Fe-Zn合金層上に形成されるZn層と、を含み、該Fe-Zn合金層は[(3.4×t)/6]μm以上の厚みを有し、ここで、tは溶融亜鉛めっき層の厚みである。
―素地鋼板を0.1~1.0g/m2の被覆量(CNi)、すなわち約11~112nmにて、Niで被覆することと、
―Ni被覆鋼板を還元性雰囲気で加熱することと、
―鋼板が亜鉛めっき浴へと送り込まれる温度(XS)まで過熱鋼板を冷却することと、
―0.11~0.14重量%である効果的なAl濃度(CAl)及び440~460℃の温度(Tp)を有する亜鉛めっき浴内に、冷却鋼板を送り込み、浸漬させることと、を含み、ここで、鋼板が亜鉛めっき浴へと送り込まれる温度(XS)は、以下の関係式:CNi・(XS-TP)/2CAl=5-100を満たす。
A.ニッケルから成る第1被覆物を使用し、及び150~650nmの厚みを有する、鋼板の被覆であり、当該鋼板が重量パーセントで以下の組成:
0.10<C<0.40%、
1.5<Mn<3.0%、
0.7<Si<3.0%、
0.05<Al<1.0%、
0.75<(Si+Al)<3.0%、
及び単に任意の主成分で
Nb≦0.5%、
B≦0.010%、
Cr≦1.0%、
Mo≦0.50%、
Ni≦1.0%、
Ti≦0.5%
などの1つ以上の成分と、
鉄及び精錬によって生じる不可避不純物で構成されている残りの組成と、を有する、鋼板の被覆と、
B.600~1200℃の温度での当該被覆鋼板の焼鈍と、
C.亜鉛系第2被覆物による工程B)で得られる鋼板の被覆と、
D.合金化溶融亜鉛めっき鋼板を形成するための合金化熱処理と、を含む。
Claims (18)
- 以下の連続工程を含む合金化溶融亜鉛めっき鋼板の製造のための方法であって、
A.ニッケルから成る第1被覆物を使用し、及び150~650nmの厚みを有する鋼板の被覆であり、前記鋼板は、重量パーセントで以下の組成:
0.10<C<0.40%、
1.5<Mn<3.0%、
0.7<Si<3.0%、
0.05<Al<1.0%、
0.75<(Si+Al)<3.0%、
及び単に任意の主成分で、
Nb≦0.5%、
B≦0.010%、
Cr≦1.0%、
Mo≦0.50%、
Ni≦1.0%、
Ti≦0.5%などの1つ以上の成分と、
鉄及び精錬によって生じる不可避不純物で構成されている残りの組成と、を有する、鋼板の被覆と、
B.600~1200℃の温度で焼鈍された前記被覆鋼板の焼鈍と、
C.亜鉛系第2被覆物による工程B)で得られる前記鋼板の被覆と、
D.合金化溶融亜鉛めっき鋼板を形成するための合金化熱処理と、を含む方法。 - 工程A)において、前記第1被覆物が200~500nmの厚みを有する、請求項1に記載の方法。
- 工程A)において、前記第1被覆物が250~450nmの厚みを有する、請求項2に記載の方法。
- 工程B)において、前記熱処理が連続焼鈍である、請求項1~3のいずれか一項に記載の方法。
- 工程B)において、前記熱処理が、-60℃~-30℃の露点で1~10%のH2を含む雰囲気で実施される、請求項1~4のいずれか一項に記載の方法。
- 工程B)において、前記熱処理が、-30℃~+30℃の露点で1~10%のH2を含む雰囲気で実施される、請求項1~5のいずれか一項に記載の方法。
- 工程C)において、前記第2層が50%超の亜鉛を含む、請求項1~6のいずれか一項に記載の方法。
- 工程C)において、前記第2層が75%超の亜鉛を含む、請求項7に記載の方法。
- 工程C)において、前記第2層が90%超の亜鉛を含む、請求項8に記載の方法。
- 前記第2被覆物がニッケルを含まない、請求項1~9のいずれか一項に記載の方法。
- 工程C)において、前記第2層が亜鉛から成る、請求項10に記載の方法。
- 工程D)において、前記合金化処理が、470~550℃の温度にて工程C)で得られる前記被覆鋼板の加熱により実施される、請求項1~11のいずれか一項に記載の方法。
- 亜鉛系第2層により直接覆われる、ニッケルを含む第1層で被覆され、前記第2合金層が、8~50重量%の鉄、0~25重量%のニッケルを含み、残りが亜鉛であるように、前記第1層及び第2層が拡散によって合金化される、請求項1~12のいずれか一項に記載の方法で得られる合金化溶融亜鉛めっき鋼板。
- 請求項13に記載の少なくとも1枚の鋼板を含む、又は請求項1~12のいずれか一項に記載の方法により得られる、少なくとも2枚の金属板のスポット溶接継手であって、前記継手が100μm超の寸法を有する3か所未満の割れを含有し、その最長の割れが300μm未満の長さを有する、スポット溶接継手。
- 前記第2の金属板が鋼板又はアルミニウム板である、請求項14に記載のスポット溶接継手。
- 前記第2の金属板が、請求項13に記載の鋼板であり、又は請求項1~12に記載の方法から得られる鋼板である、請求項15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第3の金属板を備える、請求項14~16のいずれか一項に記載のスポット溶接継手。
- 自動運転車両の製造のための、請求項13に記載の合金化溶融亜鉛めっき鋼板又は請求項14~17のいずれか一項に記載のスポット溶接継手の使用。
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