JP2022502571A - 熱間圧延鋼板及びその製造方法 - Google Patents
熱間圧延鋼板及びその製造方法 Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 95
- 239000010959 steel Substances 0.000 title claims abstract description 95
- 238000004519 manufacturing process Methods 0.000 title claims description 9
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 23
- 229910001563 bainite Inorganic materials 0.000 claims abstract description 18
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000000203 mixture Substances 0.000 claims abstract description 16
- 239000011572 manganese Substances 0.000 claims abstract description 13
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910001566 austenite Inorganic materials 0.000 claims abstract description 11
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 11
- 229910000734 martensite Inorganic materials 0.000 claims abstract description 11
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 10
- 239000011733 molybdenum Substances 0.000 claims abstract description 10
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 10
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims abstract description 10
- 230000001186 cumulative effect Effects 0.000 claims abstract description 9
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 8
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 8
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 8
- 239000011651 chromium Substances 0.000 claims abstract description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 8
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 8
- 239000010703 silicon Substances 0.000 claims abstract description 8
- 239000011593 sulfur Substances 0.000 claims abstract description 8
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 7
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims abstract description 7
- 230000000717 retained effect Effects 0.000 claims abstract description 7
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 6
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 239000011574 phosphorus Substances 0.000 claims abstract description 5
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims abstract description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 4
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910052796 boron Inorganic materials 0.000 claims abstract description 4
- 239000011575 calcium Substances 0.000 claims abstract description 4
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 4
- 229910052742 iron Inorganic materials 0.000 claims abstract description 4
- 239000011777 magnesium Substances 0.000 claims abstract description 4
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 4
- 239000010936 titanium Substances 0.000 claims abstract description 4
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 3
- 238000001816 cooling Methods 0.000 claims description 31
- 238000000034 method Methods 0.000 claims description 13
- 238000005098 hot rolling Methods 0.000 claims description 11
- 239000010955 niobium Substances 0.000 claims description 9
- 229910052758 niobium Inorganic materials 0.000 claims description 7
- 238000012545 processing Methods 0.000 claims description 4
- 238000003303 reheating Methods 0.000 claims description 4
- 238000005096 rolling process Methods 0.000 claims description 3
- 239000011265 semifinished product Substances 0.000 claims 3
- 238000004804 winding Methods 0.000 claims 2
- 150000001247 metal acetylides Chemical class 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000009749 continuous casting Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 4
- 230000009466 transformation Effects 0.000 description 4
- 230000002411 adverse Effects 0.000 description 3
- -1 nitrogen forms nitrides Chemical class 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 241000282342 Martes americana Species 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 229910001567 cementite Inorganic materials 0.000 description 2
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 2
- 150000004767 nitrides Chemical class 0.000 description 2
- 238000012827 research and development Methods 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- INZDTEICWPZYJM-UHFFFAOYSA-N 1-(chloromethyl)-4-[4-(chloromethyl)phenyl]benzene Chemical compound C1=CC(CCl)=CC=C1C1=CC=C(CCl)C=C1 INZDTEICWPZYJM-UHFFFAOYSA-N 0.000 description 1
- 241000282376 Panthera tigris Species 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 229910001297 Zn alloy Inorganic materials 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 239000003623 enhancer Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 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 1
- 238000004643 material aging Methods 0.000 description 1
- UNASZPQZIFZUSI-UHFFFAOYSA-N methylidyneniobium Chemical compound [Nb]#C UNASZPQZIFZUSI-UHFFFAOYSA-N 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
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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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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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Abstract
Description
− 940MPa以上、好ましくは960MPaを超える引張強さ、
− 8%以上、好ましくは9%を超える全伸び、
− 40%以上、好ましくは45%を超える穴広げ率。
モリブデン、バナジウム及びニオブの累積的な存在は、ニオブ及びバナジウムの両方が窒化物、炭窒化物又は炭化物を形成するのに対し、モリブデンは適切なフェライトの形成を保証するので、本発明の鋼に強度及び穴広げ率を付与するために0.3%〜0.6%の間に保たれ、したがってこの式は、析出物の形成を確保することによって引張強さとの間のバランスをとり、適切なフェライトを確保することによって穴広げ率を付与するように本発明を支持する。
表2は、表1の鋼に対し実施された処理パラメータをまとめたものである。
表3は、発明の鋼及び参考鋼の両方の微細組織を決定するための、走査型電子顕微鏡のような異なる顕微鏡に関する標準に従って行われた試験の結果を例示する。
表4は、本発明の鋼及び参考の鋼の両方の機械的特性を例示する。引張強さ、降伏強度、全伸びを求めるため、JIS Z2241規格に従った引張試験を行っている。
Claims (19)
- 熱間圧延鋼板であって、重量パーセントで表される、以下の元素、すなわち
0.11%≦炭素≦0.16%
1%≦マンガン≦2%
0.1%≦ケイ素≦0.7%
0.02%≦アルミニウム≦0.1%
0.15%≦モリブデン≦0.4%
0.15%≦バナジウム≦0.4%
0.002%≦リン≦0.02%
0%≦硫黄≦0.005%
0%≦窒素≦0.01%
を含み、以下の任意の元素のうちの1つ以上、すなわち
0%≦クロム≦0.5%
0%≦ニオブ≦0.05%
0.0001%≦カルシウム≦0.005%
0%≦ホウ素≦0.001%
0%≦マグネシウム≦0.0010%
0%≦チタン≦0.01%
を含むことができる組成を有し、
ここで、0.3%≦Mo+V+Nb≦0.6%
であり、組成の残余は、鉄及び加工によって生じる不可避的不純物から構成され、前記鋼板の微細組織は、面積分率で、70%〜90%のベイナイト、10%〜25%のフェライトを含み、ここでベイナイト及びフェライトの累積量は少なくとも90%であり、残留オーステナイト及びマルテンサイトの累積量は0%〜10%の間である、熱間圧延鋼板。 - 前記組成が、0.2%〜0.6%のケイ素を含む、請求項1に記載の熱間圧延鋼板。
- 前記組成が、0.11%〜0.15%の炭素を含む、請求項1又は2に記載の熱間圧延鋼板。
- 前記組成が、0.15%〜0.3%のバナジウムを含む、請求項3に記載の熱間圧延鋼板。
- 前記組成が、1.3%〜1.8%のマンガンを含む、請求項1〜4のいずれか一項に記載の熱間圧延鋼板。
- 前記組成が、0.15%〜0.3%のモリブデンを含む、請求項1〜5のいずれか一項に記載の熱間圧延鋼板。
- 前記組成が、0.02〜0.06%のアルミニウムを含む、請求項1〜6のいずれか一項に記載の熱間圧延鋼板。
- 前記残留オーステナイト及びマルテンサイトの累積量が2〜10%の間である、請求項1〜7のいずれか一項に記載の熱間圧延鋼板。
- 950MPa以上の引張強さ、及び40%以上の穴広げ率を有する、請求項1〜8のいずれか一項に記載の熱間圧延鋼板。
- 960MPa以上の引張強さ、及び8%以上の全伸びを有する、請求項9に記載の熱間圧延鋼板。
- 以下の連続ステップを含む熱間圧延熱処理鋼板の製造方法、すなわち
− 請求項1〜7のいずれか一項に記載の鋼組成を提供するステップ、
− 半完成品を1200℃〜1300℃の間の温度に再加熱するステップ、
− 熱間圧延仕上げ温度が850℃〜975℃の間となるように、オーステナイト範囲において前記半製品を圧延して、熱間圧延鋼ストリップを得るステップ、
− 次いで、前記熱間圧延ストリップを3段階冷却において冷却するステップであって、
・ 前記熱間圧延鋼板を冷却する段階1は、850℃〜975℃の間の温度範囲から開始して、40℃/秒〜150℃/秒の間の冷却速度で650℃〜725℃の間の温度範囲に至り、
・ 前記熱間圧延鋼板を冷却する段階2は、650℃〜725℃の間の温度範囲から開始して、620℃〜690℃の間の温度範囲に至り、前記段階2は1秒〜10秒の持続時間を有し、空冷であり、前記熱間圧延鋼板を冷却する段階3は、620℃〜690℃の間の温度範囲から開始して、20℃/秒より大きい冷却速度で450℃〜550℃の間の温度範囲に至る、冷却するステップ、
− その後、450〜550℃の間の温度範囲で前記熱間圧延鋼ストリップを巻取るステップ、
− 前記巻取った熱間圧延鋼ストリップを室温まで冷却するステップ。 - 前記半完成品の再加熱温度が、1200℃〜1275℃の間である、請求項11に記載の方法。
- 前記熱間圧延仕上げ温度が、880℃〜930℃の間である、請求項11又は12に記載の方法。
- 前記巻取り温度範囲が、470℃〜530℃の間である、請求項11から13のいずれか一項に記載の方法。
- 前記段階1の冷却の冷却速度が、40℃/秒〜120℃/秒の間である、請求項11〜14のいずれか一項に記載の方法。
- 前記段階3の冷却の冷却速度が、25℃/秒以上である、請求項11〜15のいずれか一項に記載の方法。
- 前記段階2の冷却の持続時間が、2秒〜9秒の間である、請求項11〜16のいずれか一項に記載の方法。
- 車両の構造部品又は安全部品の製造のための、請求項1〜10のいずれか一項に記載の鋼板又は請求項11〜17の方法で製造された鋼板の使用。
- 請求項18に従い得られた部品を含む車両。
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