JP2015510032A - 高マンガン熱延亜鉛めっき鋼板及びその製造方法 - Google Patents
高マンガン熱延亜鉛めっき鋼板及びその製造方法 Download PDFInfo
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- 239000011572 manganese Substances 0.000 title claims abstract description 65
- 229910052748 manganese Inorganic materials 0.000 title claims abstract description 54
- 229910001335 Galvanized steel Inorganic materials 0.000 title claims abstract description 41
- 239000008397 galvanized steel Substances 0.000 title claims abstract description 41
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 10
- 238000007747 plating Methods 0.000 claims abstract description 120
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 98
- 239000010959 steel Substances 0.000 claims abstract description 98
- 238000010438 heat treatment Methods 0.000 claims description 24
- 229910052782 aluminium Inorganic materials 0.000 claims description 20
- 229910052710 silicon Inorganic materials 0.000 claims description 17
- 238000004804 winding Methods 0.000 claims description 12
- 238000005246 galvanizing Methods 0.000 claims description 11
- 238000005098 hot rolling Methods 0.000 claims description 11
- 229910052742 iron Inorganic materials 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 7
- 229910052759 nickel Inorganic materials 0.000 claims description 7
- 238000007654 immersion Methods 0.000 claims description 5
- 229910052804 chromium Inorganic materials 0.000 claims description 4
- 229910052718 tin Inorganic materials 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 238000007598 dipping method Methods 0.000 claims 1
- 238000005275 alloying Methods 0.000 abstract description 23
- 238000000034 method Methods 0.000 abstract description 18
- 239000000463 material Substances 0.000 abstract description 15
- 230000007547 defect Effects 0.000 abstract description 14
- 229910045601 alloy Inorganic materials 0.000 description 29
- 239000000956 alloy Substances 0.000 description 29
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 22
- 238000009792 diffusion process Methods 0.000 description 17
- 230000003647 oxidation Effects 0.000 description 15
- 238000007254 oxidation reaction Methods 0.000 description 15
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 11
- 239000001301 oxygen Substances 0.000 description 11
- 229910052760 oxygen Inorganic materials 0.000 description 11
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 10
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 9
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 8
- 239000012298 atmosphere Substances 0.000 description 8
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 8
- 239000010703 silicon Substances 0.000 description 8
- 230000001629 suppression Effects 0.000 description 8
- 229910000617 Mangalloy Inorganic materials 0.000 description 7
- 239000000203 mixture Substances 0.000 description 7
- 238000000227 grinding Methods 0.000 description 6
- 238000005554 pickling Methods 0.000 description 6
- 239000011701 zinc Substances 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 230000001590 oxidative effect Effects 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 229910052725 zinc Inorganic materials 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 229910018131 Al-Mn Inorganic materials 0.000 description 1
- 229910018125 Al-Si Inorganic materials 0.000 description 1
- 229910018137 Al-Zn Inorganic materials 0.000 description 1
- 229910018461 Al—Mn Inorganic materials 0.000 description 1
- 229910018520 Al—Si Inorganic materials 0.000 description 1
- 229910018573 Al—Zn Inorganic materials 0.000 description 1
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- 229910002796 Si–Al Inorganic materials 0.000 description 1
- 229910006776 Si—Zn Inorganic materials 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 229910002056 binary alloy Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000010960 cold rolled steel Substances 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910000765 intermetallic Inorganic materials 0.000 description 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 229910002058 ternary alloy Inorganic materials 0.000 description 1
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Abstract
Description
重量%で、0.7%C、15.3%Mn、0.6%Si、2%Al、0.3%Ni、0.3%Cr、0.05%Sn、1.2%Ti、0.005%Bの組成を有するスラブを熱間圧延して厚さ2.2mmの熱延鋼板を製造した後、下表1〜2の条件で熱延巻取し、酸溶液で表面スケールを完全に除去した後、水素が5%で、残りが窒素である雰囲気下で、下表1〜2の条件に従って加熱処理を行い、480℃に冷却する。それから、下表1〜2の条件に従って3〜5秒間溶融亜鉛めっきを行って、片面のめっき付着量が45g/m2となるようにエアナイフで調整して、熱延亜鉛めっき鋼板を製造した。
−1等級:不めっきの欠陥なし
−2等級:不めっきの平均直径が1mm未満
−3等級:不めっきの平均直径が1〜2mm
−4等級:不めっきの平均直径が2〜3mm
−5等級:不めっきの平均直径が3mm以上
−1等級:剥離なし
−2等級:5%未満剥離
−3等級:5〜10%未満剥離
−4等級:10%〜30%未満剥離
−5等級:30%未満剥離
一方、合金化溶融亜鉛めっき鋼板の特性を評価するために、上記実施例1の熱延鋼板を下表3の条件で熱延巻取、加熱、めっき及び合金化工程を施し、熱延合金化溶融亜鉛めっき鋼板を製造した。
−1等級:剥離なし
−2等級:剥離幅が2mm以下
−3等級:剥離幅が2〜5mm
−4等級:剥離幅が5〜10mm
−5等級:剥離幅が10mm以上
11 内部酸化物層
20 亜鉛めっき層
Claims (8)
- マンガンを5〜35重量%含む熱延鋼板及び前記熱延鋼板上に形成された亜鉛めっき層を含み、
前記亜鉛めっき層と接する熱延鋼板の内部に内部酸化物層が形成されている高マンガン熱延亜鉛めっき鋼板。 - 前記熱延鋼板は、重量%で、C:0.1〜1.5%、Mn:5〜35%、Si:0.1〜3%、Al:0.01〜6%、Ni:0.1〜1.0%、Cr:0.1〜0.4%、Sn:0.01〜0.2%、Ti:0.01〜0.2%、B:0005〜0.006%、残りはFe及びその他不可避な不純物を含む、請求項1に記載の高マンガン熱延亜鉛めっき鋼板。
- 前記内部酸化物層の厚さは1〜5μmである、請求項1に記載の高マンガン熱延亜鉛めっき鋼板。
- 前記亜鉛めっき層は、溶融亜鉛めっき層または合金化溶融亜鉛めっき層である、請求項1に記載の高マンガン熱延亜鉛めっき鋼板。
- マンガンを5〜35重量%含む鋼スラブを用意する段階と、
前記鋼スラブを熱間圧延して熱延鋼板を製造する段階と、
前記熱延鋼板を500〜700℃で巻取る段階と、
前記巻取られた熱延鋼板を露点−10〜−80℃、加熱温度480〜600℃で加熱処理する段階と、
前記加熱処理した熱延鋼板を480〜500℃に冷却する段階と、
前記冷却した熱延鋼板を亜鉛めっきする段階と、
を含む高マンガン熱延亜鉛めっき鋼板の製造方法。 - 前記亜鉛めっきは、Alが0.13〜0.25重量%含まれており、めっき浴温度が460〜500℃である溶融亜鉛めっき浴に浸漬してめっきすることで溶融亜鉛めっき層を形成する、請求項5に記載の高マンガン熱延亜鉛めっき鋼板の製造方法。
- 前記亜鉛めっきは、Alが0.08〜0.13重量%含まれており、めっき浴温度が460〜500℃である溶融亜鉛めっき浴に浸漬してめっきした後、500〜560℃で合金化処理して合金化溶融亜鉛めっき層を形成する、請求項5に記載の高マンガン熱延亜鉛めっき鋼板の製造方法。
- 前記巻取は1.5〜2.5時間(h)行う、請求項5に記載の高マンガン熱延亜鉛めっき鋼板の製造方法。
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