JP2017520681A - 高強度多相鋼、製造方法および使用 - Google Patents
高強度多相鋼、製造方法および使用 Download PDFInfo
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- JP2017520681A JP2017520681A JP2016571335A JP2016571335A JP2017520681A JP 2017520681 A JP2017520681 A JP 2017520681A JP 2016571335 A JP2016571335 A JP 2016571335A JP 2016571335 A JP2016571335 A JP 2016571335A JP 2017520681 A JP2017520681 A JP 2017520681A
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- steel
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 138
- 239000010959 steel Substances 0.000 title claims abstract description 138
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- 239000000203 mixture Substances 0.000 claims abstract description 20
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- 229910001563 bainite Inorganic materials 0.000 claims abstract description 14
- 229910000734 martensite Inorganic materials 0.000 claims abstract description 14
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- 239000010960 cold rolled steel Substances 0.000 claims description 29
- 238000005097 cold rolling Methods 0.000 claims description 19
- 230000003647 oxidation Effects 0.000 claims description 15
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- 229910052748 manganese Inorganic materials 0.000 claims description 12
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- 239000011572 manganese Substances 0.000 description 17
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- 239000000126 substance Substances 0.000 description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 10
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- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- 229910000797 Ultra-high-strength steel Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
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- 239000000155 melt Substances 0.000 description 2
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 2
- 239000000047 product Substances 0.000 description 2
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- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- 229910001335 Galvanized steel Inorganic materials 0.000 description 1
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- 238000010191 image analysis Methods 0.000 description 1
- YPJRHEKCFKOVRT-UHFFFAOYSA-N lerociclib Chemical compound C1CN(C(C)C)CCN1C(C=N1)=CC=C1NC1=NC=C(C=C2N3C4(CCCCC4)CNC2=O)C3=N1 YPJRHEKCFKOVRT-UHFFFAOYSA-N 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
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- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
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- 239000012779 reinforcing material Substances 0.000 description 1
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- 238000005204 segregation Methods 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000009466 transformation Effects 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
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
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- C—CHEMISTRY; METALLURGY
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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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- B32B15/00—Layered products comprising a layer of metal
- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
- B32B15/013—Layered products comprising a layer of metal all layers being exclusively metallic one layer being formed of an iron alloy or steel, another layer being formed of a metal other than iron or aluminium
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- C—CHEMISTRY; METALLURGY
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Abstract
Description
980MPa以上、さらには1180MPa以上の引張強度
8%以上の全伸び
20%以上、さらには40%以上の穴広げ値
500MPa以上、さらには780MPaを超える降伏強度
を有する溶融めっきされた高強度鋼をもたらすことである。
0.05≦C≦0.15%
2≦Mn≦3%
Al≦0.1%
0.3≦Si≦1.5%
0.01%≦Nb≦0.05%
N≦0.02%
0.1≦Cr+Mo≦1%
0.0001≦B<0.0025%
Ti≦0.5%
V<0.01%
S≦0.01%
P≦0.05%
からなり、組成の残部が鉄および精錬から生じる不可避的不純物であり、その微細構造は、表面割合で、50から95%の間のマルテンサイト、5から50%の間のフェライトとベイナイトとの合計からなり、フェライト粒径は10μm未満であり、フェライト粒径のアスペクト比は1から3の間である、溶融めっきされた鋼板である。
− 組成が前記の本発明による鋼を鋳造して、スラブを得る工程、
− 1180℃を超える温度のTreheatでスラブを再加熱する工程、
− 再加熱されたスラブを800℃を超える温度で熱間圧延して、熱間圧延鋼を得る工程、
− 500から800℃の間の巻取温度Tcoilingまで、従来の冷却速度で熱間圧延鋼を冷却する工程、次いで
− Tcoilingで冷却された熱間圧延鋼を巻き取る工程、
− 熱間圧延鋼を脱スケーリングする工程、
− 場合により、熱間圧延鋼を300℃を超える温度TIAで20分を超えて焼鈍する工程、
− 場合により、カバーに入る前の熱間圧延鋼の温度は400℃を超えるべきである。熱間圧延鋼の冷却速度は、1℃/分以下および0.01℃/分以上であるべきである。
− 鋼を冷間圧延して、冷間圧延鋼板を得る工程、
− 以下の工程を含む冷間圧延鋼板を焼鈍する工程、
− 前記冷延圧延鋼板を0.2%から4%の間の過剰酸素体積百分率を有する雰囲気を有する直火炉内で加熱する工程であって、酸化工程が500℃から750℃の間で起こる該加熱工程、
− 前記直火炉温度から放射管炉内の焼鈍温度まで加熱する工程であって、加熱速度は0.5から2.5℃/秒の間に含まれ、放射管炉内の雰囲気の露点は25℃以下である該加熱工程、
− 前記焼鈍温度Tannealは750から950℃の間に含まれる工程、
− 前記鋼を前記焼鈍温度Tannealで少なくとも30秒間および300秒間以下の間維持する工程、
− 冷間圧延鋼を440℃から470℃の間の温度TOAまで冷却する工程、
− 冷間圧延鋼をTOAで30秒を超え、180秒未満保持する工程、
− Tannealで維持される前記加熱および冷却工程の間に、冷間圧延鋼の表面を酸化し、その後還元して、Si、Mn、Al、Ti含有酸化物の1つ以上を含む、少なくとも200nmおよび100μm未満の内部酸化深さを得る工程、
− 冷間圧延鋼を溶融めっきして、コーティングされた冷間圧延鋼を得る工程、
− 場合により、冷間圧延鋼コーティングにおいて7%から15%の間の鉄含有率に達するように溶融めっきされた冷間圧延鋼を合金化溶融亜鉛メッキする工程、
− 溶融めっきされた冷間圧延鋼を、少なくとも1℃/秒の冷却速度で室温まで冷却する工程。
− Tcoilingは最後のパス温度Tlp℃より低くなければならない。この温度は、好ましくは800℃未満である。好ましくは、巻き取り温度は、500℃≦Tcoiling≦750℃である。
− 巻き取り後、熱間圧延された鋼は脱スケーリングされる。
− 次いで、場合により、熱間圧延された鋼は、300℃を超える温度で20分を超えて焼鈍される。熱処理が300℃未満で行われると、冷間圧延のための力が高すぎ、20分未満で同じ結果が得られると、材料はあまりに硬くなり、容易に冷間圧延されなくなる。さらに、本発明者らは、この熱的中間処理により驚くべき方法で板厚の均一性が大幅に改善することを見出した。好ましくは、熱処理は500℃から650℃の間で30時間から100時間行われる。
− 場合により、必要に応じて断熱されたカバーの下に熱間圧延された鋼を配置し、熱間圧延された製品の均一な冷却を促進するために1つ以上のコイルを覆う。さらに、本発明者らは、このカバー処理により板の厚さの均一性が向上することができることも発見した。
− 好ましい実施形態では、カバーに入る前の熱間圧延された鋼の温度は400℃を上回るべきである。鋼の冷却速度は、1℃/分以下且つ0.01℃/分以上であるべきである。冷却速度が1℃/分より高い場合、ホットバンドは冷間圧延後には硬くなりすぎる。0.01℃/分より低い冷却速度は、生産性に有害であろう。
− 最終的な目標厚さに依存する冷間圧延比を有する鋼の冷間圧延。冷間圧延比は、(冷間圧延前の厚さ)−(冷間圧延後の厚さ)/(冷間圧延前の厚さ)で定義される。冷間減少比は40から60%の間に含まれるのが好ましい。従って、蓄積された歪エネルギーは、焼鈍の間のさらなる再結晶を保証するのに十分である。
− 750℃から950℃の間でなければならない焼鈍温度Tannealまでの鋼の加熱。
UTS(MPa)は、圧延方向に対する横方向の引張試験によって測定された最大引張強度を指す。
再加熱温度(HR再加熱)、℃
仕上げ圧延温度(HRFT):℃
巻き取り温度(CT):℃
中間焼鈍温度(IA T):℃および時間(IA t):時間
ホットバンド減速冷却、カバーへの入口温度(℃)、および冷却速度(℃/分)
適用された冷間圧延(CR):
直火炉の酸化温度(DFF温度):℃
DFFにおける過剰の酸素体積百分率、
焼鈍温度到達前の加熱速度(℃/秒)
焼鈍炉の露点(℃)
焼鈍中の浸漬温度(AT):℃
焼鈍中の浸漬時間(At):秒
過時効温度範囲 OAT
過時効時間 OAt
コーティング種類:465℃での亜鉛メッキに対してはGI、様々な温度での金属化溶融亜鉛メッキに対してはGA
Claims (23)
- 少なくとも980MPaの引張強度を有し、500MPa以上の降伏強度を有し、8%以上の全伸びを有し、その組成は、重量パーセントで:
0.05≦C≦0.15%
2≦Mn≦3%
Al≦0.1%
0.3≦Si≦1.5%
0.01%≦Nb≦0.05%
N≦0.02%
0.1≦Cr+Mo≦1%
0.0001≦B<0.0025%
Ti≦0.5%
V<0.01%
S≦0.01%
P≦0.05%
からなり、組成の残部が鉄および精錬から生じる不可避的不純物であり、その微細構造は、表面割合で、50から95%の間のマルテンサイト、および5から50%の間のフェライトとベイナイトとの合計からなり、フェライト粒径は10μm未満であり、およびフェライト粒径のアスペクト比は1から3の間である冷間圧延され、溶融めっきされた鋼板。 - 0.09≦C≦0.14%である請求項1に記載の鋼板。
- 2.2≦Mn≦2.7%である請求項1または2に記載の鋼板。
- Al≦0.05%である請求項1から3のいずれか一項に記載の鋼板。
- 0.6<Si≦1.3%である請求項1から4のいずれか一項に記載の鋼板。
- Nb≦0.03%である請求項1から5のいずれか一項に記載の鋼板。
- 0.1≦Cr+Mo≦0.7%である請求項1から6のいずれか一項に記載の鋼板。
- 0.001≦B≦0.0022%である請求項1から7のいずれか一項に記載の鋼板。
- 0.02%≦Ti≦0.05%である請求項1から8のいずれか一項に記載の鋼板。
- Si、Mn、Al、Ti含有酸化物の1つ以上を含む、少なくとも200nmおよび100μm未満の内部酸化深さが溶融めっきの下に存在する請求項1から9のいずれか一項に記載の鋼板。
- フェライトおよびベイナイトの合計の表面割合は20から40%の間であり、平均フェライト粒径は3μm未満である請求項1から10のいずれか一項に記載の鋼板。
- 引張強度は少なくとも980MPaであり、降伏強度は少なくとも500MPaであり、全伸びは少なくとも8%であり、および穴広げは少なくとも20%である請求項1から11のいずれか一項に記載の鋼板。
- 引張強度は少なくとも1180MPaであり、降伏強度は少なくとも780MPaであり、全伸びは少なくとも8%であり、および穴広げは少なくとも20%である請求項12に記載の鋼板。
- 鋼は、亜鉛メッキまたは合金化溶融亜鉛メッキされる請求項1から13のいずれか一項に記載の鋼板。
- 以下の連続する工程:
− 組成が請求項1から9のいずれか一項に従った鋼を鋳造して、スラブを得る工程、
− 1180℃を超える温度のTreheatでスラブを再加熱する工程、
− 再加熱されたスラブを800℃を超える温度で熱間圧延して、熱間圧延鋼を得る工程、
− 500℃から800℃の間の巻取温度Tcoilingまで、従来の冷却速度で熱間圧延鋼を冷却する工程、次いで
− Tcoilingで冷却された熱間圧延鋼を巻き取る工程、
− 熱間圧延鋼を脱スケーリングする工程、
− 場合により、熱間圧延鋼を300℃を超える温度TIAで20分を超えて焼鈍する工程、
− 場合により、カバーに入る前の熱間圧延鋼の温度は400℃を超えるべきである。熱間圧延鋼の冷却速度は、1℃/分以下および0.01℃/分以上であるべきである。
− 鋼を冷間圧延して、冷間圧延鋼板を得る工程、
− 以下の工程を含む冷間圧延鋼板を焼鈍する工程、
− 前記冷間圧延鋼板を0.2%から4%の間の過剰酸素体積百分率を有する雰囲気を有する直火炉内で加熱する工程であって、酸化工程が500℃から750℃の間で起こる該加熱工程、
− 前記直火炉温度から放射管炉内の焼鈍温度まで加熱する工程であって、加熱速度は0.5から2.5℃/秒の間であり、放射管炉内の雰囲気の露点は25℃以下である該加熱工程、
− 前記焼鈍温度Tannealは750から950℃の間に含まれる工程、
− 前記鋼を前記焼鈍温度Tannealで少なくとも30秒間および300秒間以下の間維持する工程、
− 冷間圧延鋼を440℃から470℃の間の温度TOAまで冷却する工程、
− 冷間圧延鋼をTOAで30秒を超え、180秒未満保持する工程、および
− Tannealで維持される前記加熱および冷却工程の間に、冷間圧延鋼の表面を酸化し、その後還元して、Si、Mn、Al、Ti含有酸化物の1つ以上を含む、少なくとも200nmおよび100μm未満の内部酸化深さを得る工程、
− 冷間圧延鋼を溶融めっきしてコーティングされた冷間圧延鋼を得る工程、
− 場合により、冷間圧延鋼コーティングにおいて7%から15%の間の鉄含有率に達するように溶融めっきされた冷間圧延鋼を合金化溶融亜鉛メッキする工程、
− 溶融めっきされた冷間圧延鋼を、少なくとも1℃/秒の冷却速度で室温まで冷却する工程
を含む請求項1から14のいずれか一項に記載の冷間圧延され、溶融めっきされた鋼板の製造方法。 - 500℃≦Tcoiling≦750℃である請求項15に記載の溶融めっきされた鋼板の製造方法。
- 30時間から100時間の間の時間中500℃≦TIA≦650℃である請求項15および16のいずれか一項に記載の溶融めっきされた鋼板の製造方法。
- 冷間圧延の減少率は40から60%である請求項15から17のいずれか一項に記載の高強度の溶融めっきされた鋼板の製造方法。
- 冷間圧延鋼の表面は、露点が0℃未満の混合ガス雰囲気を有する放射管炉内で還元される請求項15から18のいずれか一項に記載の高強度の溶融めっきされた鋼板の製造方法。
- 775℃≦Tanneal≦860℃である請求項15から20のいずれか一項に記載の溶融めっきされた鋼板の製造方法。
- 溶融めっきが液体亜鉛浴中で行われて、亜鉛メッキされたまたは合金化溶融亜鉛メッキされた、冷間圧延された高強度鋼を得る請求項15から21のいずれか一項に記載の溶融めっきされた鋼板の製造方法。
- 自動車の部品を製造するための、請求項1から14のいずれか一項に記載の鋼板の使用。
- 自動車の部品を製造するための、請求項15から23のいずれか一項に従って製造された鋼板の使用。
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PCT/IB2014/000991 WO2015185956A1 (en) | 2014-06-06 | 2014-06-06 | High strength multiphase galvanized steel sheet, production method and use |
PCT/IB2015/000819 WO2015185975A1 (en) | 2014-06-06 | 2015-06-03 | High strength multiphase steel, production method and use |
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US20170137906A1 (en) | 2017-05-18 |
JP6599902B2 (ja) | 2019-10-30 |
EP3152336B1 (en) | 2019-02-20 |
CA2951215C (en) | 2023-08-01 |
KR20170015303A (ko) | 2017-02-08 |
TR201907448T4 (tr) | 2019-06-21 |
PL3152336T3 (pl) | 2019-08-30 |
ES2729870T3 (es) | 2019-11-06 |
US11047020B2 (en) | 2021-06-29 |
UA117865C2 (uk) | 2018-10-10 |
CN106471147B (zh) | 2018-07-10 |
EP3152336A1 (en) | 2017-04-12 |
BR112016027681B1 (pt) | 2021-04-27 |
MA39954B1 (fr) | 2019-05-31 |
CN106471147A (zh) | 2017-03-01 |
US10612107B2 (en) | 2020-04-07 |
WO2015185975A1 (en) | 2015-12-10 |
WO2015185956A1 (en) | 2015-12-10 |
KR102389648B1 (ko) | 2022-04-21 |
CA2951215A1 (en) | 2015-12-10 |
HUE044866T2 (hu) | 2019-11-28 |
RU2675025C2 (ru) | 2018-12-14 |
US20190256942A1 (en) | 2019-08-22 |
MX2016016129A (es) | 2017-03-28 |
MA39954A (fr) | 2017-04-12 |
RU2016147787A (ru) | 2018-06-06 |
RU2016147787A3 (ja) | 2018-10-26 |
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