JP2011052317A - 複合組織鋼板及びこれを製造する方法 - Google Patents
複合組織鋼板及びこれを製造する方法 Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 24
- 229910000885 Dual-phase steel Inorganic materials 0.000 title abstract 2
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 98
- 239000010959 steel Substances 0.000 claims abstract description 98
- 238000000137 annealing Methods 0.000 claims abstract description 40
- 238000005097 cold rolling Methods 0.000 claims abstract description 14
- 238000005246 galvanizing Methods 0.000 claims abstract description 14
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 14
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 12
- 239000012535 impurity Substances 0.000 claims abstract description 8
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 8
- 239000002131 composite material Substances 0.000 claims description 55
- 229910000734 martensite Inorganic materials 0.000 claims description 28
- 229910000859 α-Fe Inorganic materials 0.000 claims description 22
- 238000005098 hot rolling Methods 0.000 claims description 16
- 238000010438 heat treatment Methods 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 15
- 238000001816 cooling Methods 0.000 claims description 13
- 239000010960 cold rolled steel Substances 0.000 claims description 7
- 238000005096 rolling process Methods 0.000 claims description 7
- 230000009467 reduction Effects 0.000 claims description 6
- 238000005482 strain hardening Methods 0.000 claims description 6
- 229910001563 bainite Inorganic materials 0.000 claims description 5
- 238000003303 reheating Methods 0.000 claims description 5
- 238000009749 continuous casting Methods 0.000 claims description 4
- 238000009628 steelmaking Methods 0.000 claims description 4
- 238000005554 pickling Methods 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 abstract description 20
- 239000000203 mixture Substances 0.000 abstract description 11
- 229910052750 molybdenum Inorganic materials 0.000 abstract description 9
- 229910052782 aluminium Inorganic materials 0.000 abstract description 8
- 229910052758 niobium Inorganic materials 0.000 abstract description 8
- 229910052796 boron Inorganic materials 0.000 abstract description 7
- 229910052804 chromium Inorganic materials 0.000 abstract description 7
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 6
- 229910052717 sulfur Inorganic materials 0.000 abstract description 4
- 230000008569 process Effects 0.000 description 24
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 17
- 229910001566 austenite Inorganic materials 0.000 description 16
- 239000011651 chromium Substances 0.000 description 16
- 239000010955 niobium Substances 0.000 description 13
- 238000007747 plating Methods 0.000 description 13
- 239000011572 manganese Substances 0.000 description 12
- 239000013078 crystal Substances 0.000 description 11
- 230000000694 effects Effects 0.000 description 11
- 230000009466 transformation Effects 0.000 description 9
- 239000000126 substance Substances 0.000 description 8
- 229910001335 Galvanized steel Inorganic materials 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 7
- 239000008397 galvanized steel Substances 0.000 description 7
- 239000002244 precipitate Substances 0.000 description 7
- 239000006104 solid solution Substances 0.000 description 7
- 230000000087 stabilizing effect Effects 0.000 description 7
- 230000035882 stress Effects 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 230000000704 physical effect Effects 0.000 description 6
- 238000001953 recrystallisation Methods 0.000 description 6
- 238000005275 alloying Methods 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 5
- 239000011733 molybdenum Substances 0.000 description 5
- 239000010703 silicon Substances 0.000 description 5
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 238000005266 casting Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 238000011161 development Methods 0.000 description 4
- 230000018109 developmental process Effects 0.000 description 4
- 229910001562 pearlite Inorganic materials 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 4
- 238000005728 strengthening Methods 0.000 description 4
- 230000002159 abnormal effect Effects 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910001567 cementite Inorganic materials 0.000 description 3
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 3
- 150000001247 metal acetylides Chemical class 0.000 description 3
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 3
- 239000011574 phosphorus Substances 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000011835 investigation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 229910000760 Hardened steel Inorganic materials 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 229910001035 Soft ferrite Inorganic materials 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010835 comparative analysis Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000004299 exfoliation Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- C22C38/00—Ferrous alloys, e.g. steel alloys
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- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- 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
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- 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
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- 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
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold rolling
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- 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
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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Abstract
【解決手段】C:0.05〜0.10重量%、Si:0.03〜0.50重量%、Mn:1.50〜2.00重量%、P:0重量%超0.03重量%、S:0重量%超0.003重量%、Al:0.03〜0.50重量%、Cr:0.1〜0.2重量%、Mo:0.1〜0.20重量%、Nb:0.02〜0.04重量%、B:0重量%超0.005重量%、N:0重量%超0.01重量%、残りのFe及びその他不可避な不純物で組成され、冷間圧延後に熱処理及び溶融亜鉛メッキをした高強度鋼板及びその製造方法。
【選択図】図1
Description
Claims (13)
- 自動車の外板及び内板材として、C:0.05〜0.10重量%、Si:0.03〜0.50重量%、Mn:1.50〜2.00重量%、P:0重量%超0.03重量%、S:0重量%超0.003重量%、Al:0.03〜0.50重量%、Cr:0.1〜0.2重量%、Mo:0.1〜0.20重量%、Nb:0.02〜0.04重量%、B:0重量%超0.005重量%、N:0重量%超0.01重量%、残りのFe及びその他不可避な不純物で組成され、440〜590Mpaの引張強度(TS)を有し、主相がフェライトであり、第2の相が体積分率で5〜20%のマルテンサイトであり、体積分率で0%超5%未満のベイナイトを含有することを特徴とする複合組織鋼板。
- 前記複合組織鋼板の降伏応力(YS)は、270MPa以上であることを特徴とする請求項1に記載の複合組織鋼板。
- 前記複合組織鋼板の延伸率(El)は、28%以上であることを特徴とする請求項1に記載の複合組織鋼板。
- 前記複合組織鋼板の加工硬化指数(n)は、0.15〜0.20であることを特徴とする請求項1に記載の複合組織鋼板。
- 前記複合組織鋼板のRi値(Lankford value)は、1.0〜2.0であることを特徴とする請求項1に記載の複合組織鋼板。
- 自動車の外板及び内板材として、C:0.05〜0.10重量%、Si:0.03〜0.50重量%、Mn:1.50〜2.00重量%、P:0重量%超0.03重量%、S:0重量%超0.003重量%、Al:0.03〜0.50重量%、Cr:0.1〜0.2重量%、Mo:0.1〜0.20重量%、Nb:0.02〜0.04重量%、B:0.005重量%以下、N:0重量%超0.01重量%、残りのFe及びその他不可避な不純物で組成される鋼スラブを再加熱する段階と、
前記鋼スラブを熱間圧延して熱延鋼板を形成する段階と、
前記熱延鋼板をコイリングして熱延コイルを形成する段階と、
前記熱延コイルをアンコイリングして、酸洗及び冷間圧延して冷延鋼鈑を形成する段階と、
前記冷延鋼鈑を焼鈍熱処理して複合組織を有する焼鈍鋼板を形成する段階と、
を備え、
前記焼鈍熱処理は連続焼鈍ラインで行い、前記連続焼鈍ラインは10〜20℃/secで750〜850℃まで加熱して100〜110秒間焼鈍する段階と、前記焼鈍に続いて3〜15℃/secで460〜540℃まで冷却する段階と、前記460〜540℃の温度で100〜200秒間、過時効処理する段階と、を備えることを特徴とする複合組織鋼板製造方法。 - 前記鋼スラブは、製鋼工程を通じて溶鋼を製造し、前記溶鋼を造塊又は連続鋳造して製造することを特徴とする請求項6に記載の複合組織鋼板製造方法。
- 前記再加熱する段階は、1150〜1250℃の温度で1.5〜3.5時間維持することを特徴とする請求項6に記載の複合組織鋼板製造方法。
- 前記熱間圧延する段階は、800〜900℃の温度範囲で、5段階(pass)で行うことを特徴とする請求項6に記載の複合組織鋼板製造方法。
- 前記コイリングする段階は、550〜650℃の温度範囲で行うことを特徴とする請求項6に記載の複合組織鋼板製造方法。
- 前記冷間圧延する段階の圧下率は、50〜80%で行うことを特徴とする請求項6に記載の複合組織鋼板製造方法。
- 前記焼鈍熱処理後に480〜560℃の温度で行う溶融亜鉛メッキ工程をさらに行うことを特徴とする請求項6に記載の複合組織鋼板製造方法。
- 前記複合組織鋼板製造方法において、前記連続焼鈍ラインを進行するスピード(Line Speed;L/S)は、80〜200mpmを基準とすることを特徴とする請求項6に記載の複合組織鋼板製造方法。
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EP2290111A1 (en) | 2011-03-02 |
JP5290245B2 (ja) | 2013-09-18 |
KR100958019B1 (ko) | 2010-05-17 |
US20110048586A1 (en) | 2011-03-03 |
EP2290111B1 (en) | 2013-09-18 |
US8449698B2 (en) | 2013-05-28 |
CN102002639B (zh) | 2013-11-06 |
CN102002639A (zh) | 2011-04-06 |
US20120255654A1 (en) | 2012-10-11 |
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