JP7439265B2 - 低ケイ素低炭素当量ギガパスカル級多相鋼板/鋼帯及びその製造方法 - Google Patents
低ケイ素低炭素当量ギガパスカル級多相鋼板/鋼帯及びその製造方法 Download PDFInfo
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- JP7439265B2 JP7439265B2 JP2022539208A JP2022539208A JP7439265B2 JP 7439265 B2 JP7439265 B2 JP 7439265B2 JP 2022539208 A JP2022539208 A JP 2022539208A JP 2022539208 A JP2022539208 A JP 2022539208A JP 7439265 B2 JP7439265 B2 JP 7439265B2
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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Description
鋼中のケイ素含有量が高いと、赤いうろこ状などの欠陥(赤いスケール、虎の縞模様など)が形成され、鋼の表面品質が低下する可能性があり、なかでも、ケイ素含有量が0.5%の自動車用鋼では、ストリップ鋼の表面に等間隔の縞模様のスケールがあり、赤いスケール、虎の縞模様ばどの疵が、ストリップ鋼の表面の約30%を占めている。この表面状態は、表面の外観と色に非常に厳しい自動車パーツ製品の製造には使用できない。ケイ素含有量が自動車用鋼製品の要件を満たすことができる当該発明特許に開示された唯一の発明例では、高Cuおよび高Niの添加がさらに高い合金コストをもたらすことは言うまでもなく、炭素当量は0.73以上と高い。したがって、当該発明の特許に関わる製品は、市場で緊急に必要とされるギガパスカルレベル自動車シャーシ用の低コスト、低炭素当量の多相鋼製品を製造するために使用することはできない。
低ケイ素低炭素当量ギガパスカルレベル多相鋼板/鋼帯であって、その成分の重量百分比は、C:0.03~0.07%、Si:0.1~0.5%、Mn:1.7~2.0%、P≦0.02%、S≦0.01%、N≦0.01%、Al:0.01~0.05%、Cr:0.4~0.7%、B:0.001~0.005%、Ti:0.07~0.15%であり、さらに、Mo:0.15~0.4%又はNb:0.02~0.08%の一つ又は二つを含み、残部は、Feと他の不可避不純物である;かつ同時に以下を満たす:
有効なB*含有量≧0.001、有効なB*含有量=B-[Ti-3.4N-1.2(C-Nb/7.8)]/22;
CE< 0.58、CE=C+Mn/6+(Cr+Mo+V)/5+(Si+Ni+Cu)/15。
好ましくは、重量百分比で、前記Si含有量は、0.15~0.27%である。
好ましくは、前記鋼板/鋼帯の微細組織は、フェライト、下部ベイナイト、および少量の炭素化物析出相、他の介在物相及び/又は微量マルテンサイト相であり、その中、体積百分比で、フェライト含有量≦20%、フェライト+下部ベイナイト含有量≧95%である。
1)製錬、連続鋳造
上記化学組成に従って製錬し、連続鋳造によりスラブを鋳造し、連続鋳造中のスラブの冷却速度≧5℃/sである;
2)スラブ熱送、圧延
700℃以上の温度で、スラブを加熱炉に投入し、スラブを加熱し、加熱温度は1100~1250℃である;スラブの熱間圧延の最初二回のパスの圧下率≧55%である;仕上げ圧延・最終圧延の温度は、850~950℃である;
3)圧延後冷却、卷取り
圧延後に、水で冷却し、卷取り温度は550~630℃である;
4)酸洗。
本発明にかかる鋼の成分設計において:
炭素(C):炭素が、直接に、鋼板/鋼帯の強度、溶接性と成形性に影響する。炭素の含有量が多いほど、鋼板の強度を向上させることに寄与し、炭素含有量が0.03%より低い場合、鋼板/鋼帯の強度が目標要求に達しない;炭素含有量が0.07%より高い場合、炭素当量が高すぎやすくなり、鋼板の溶接性が低下しやすくなる。したがって、本発明には、炭素含有量の範囲を、0.03~0.07%に制御する。
連続鋳造際のスラブ冷却速率が、鋼板/鋼帯の最終組織の結晶粒大きさ、液相に形成される介在物大きさ、スラブ組織における柱状結晶の割合に影響を与える。冷却速度が5℃/sより低いと、一方、スラブ中の柱状結晶の厚さまたは割合が設計上の要求より高くなり、そしてその後の最終組織で、帯状組織を形成しやすくなり、鋼板/鋼帯の曲げ特性に影響を与える;もう一方、連続鋳造中にスラブの冷却速度が低下すると、最終組織における結晶粒大きさが設計通りにならず、鋼の液相中に粗大介在物(典型的にはTiN)が発生し、穴拡げと曲げ特性に悪影響を及ぼす。
常温力学特性:引張強度≧980MPa、好ましくは≧1000MPa;降伏強度≧780MPa、好ましくは≧800MPa;
穴拡げ率性能:元の穴は抜き穴である場合の穴拡げ率は50%超、好ましくに≧55%;元の穴はリーマ穴である場合の穴拡げ率は60%超、好ましくに≧65%である。
表1に示される異なる組成の鋼を製錬してから、表2に示されるように加熱+熱間圧延プロセスを実行し、厚さが4mm未満の鋼板を得た。長手方向に50mmゲージ長と5mmゲージ長の引張サンプルを採取し、降伏、引張強度および伸びを測定し,鋼板中央部に穴拡げ率と180ー曲げ特性を測定した;試験データを表2に示す。ただし、穴拡げ率は、中央部に穴のある試料をパンチ金型でダイ金型に押し込み、板の穴縁部がくびれたり貫通亀裂が生じたりするまで、試料の中央部の穴を拡げるといった穴拡げ試験で測定した。試料中央部の元の穴の製造方法は穴拡げ率の計測結果に大きな影響を与えるため、抜き穴およびリーマ穴によってそれぞれ試料中央部の元の穴を製造し、後段の試験および計測方法は、ISO/DIS 16630規格に規定される穴広げ率の計測方法に沿って行われた。
Claims (11)
- 成分重量百分率は、C:0.03~0.07%、Si:0.1~0.5%、Mn:1.7~2.0%、P≦0.02%、S≦0.01%、N≦0.01%、Al:0.01~0.05%、Cr:0.4~0.7%、B:0.001~0.005%、Ti:0.07~0.15%であり、さらに、Mo:0.15~0.4%又はNb:0.02~0.08%又はMo:0.15~0.4%及びNb:0.02~0.08%の両方を含み、残部は、Feと不可避不純物である;かつ同時に以下を満たすことを特徴とする低ケイ素低炭素当量多相鋼板又は鋼帯であって、前記鋼板又は鋼帯は、引張強度≧980MPa及び降伏強度≧780MPaを有し、元の穴が抜き穴である場合の穴拡げ率は50%超であり、元の穴がリーマ穴である場合の穴拡げ率は60%超であり、前記鋼板又は鋼帯の微細組織はフェライトおよび下部ベイナイトを含有し、フェライト含有量≦20%、フェライト+下部ベイナイト含有量≧95%である、前記多相鋼板又は鋼帯:
有効なB*含有量≧0.001、有効なB*含有量=B-[Ti-3.4N-1.2(C-Nb/7.8)]/22;
CE<0.58、CE=C+Mn/6+(Cr+Mo+V)/5+(Si+Ni+Cu)/15。 - 成分重量百分率で、前記のC含有量は、0.045~0.06%であることを特徴とする請求項1に記載された低ケイ素低炭素当量多相鋼板又は鋼帯。
- 成分重量百分率で、前記のSi含有量は、0.15~0.27%であることを特徴とする請求項1に記載された低ケイ素低炭素当量多相鋼板又は鋼帯。
- 成分重量百分率で、前記のB含有量は、0.002~0.004%であることを特徴とする請求項1に記載された低ケイ素低炭素当量多相鋼板又は鋼帯。
- 前記多相鋼板又は鋼帯は、5%以下の炭素化物析出相、0.01%以下の他の介在物相、及び/又は0.5%以下のマルテンサイト相をさらに含有することを特徴とする請求項1~4のいずれか一つに記載された低ケイ素低炭素当量多相鋼板又は鋼帯。
- 前記鋼板又は鋼帯の微細組織は、さらにTiN粒子を含有し、且つ単一粒子の最長辺の長さ<8μm又は面積<50μm2であることを特徴とする請求項1に記載された低ケイ素低炭素当量多相鋼板又は鋼帯。
- フェライト晶粒平均直径<6μmで、又は粒度レベルASTMグレード判定>11.8であることを特徴とする請求項1に記載された低ケイ素低炭素当量多相鋼板又は鋼帯。
- 前記他の介在物相は、MnS、TiN、及びAlNから選択されることを特徴とする請求項5に記載された低ケイ素低炭素当量多相鋼板又は鋼帯。
- 以下のステップを含む、請求項1~8のいずれか一つに記載された低ケイ素低炭素当量多相鋼板又は鋼帯の製造方法:
1) 製錬、連続鋳造
請求項1~4のいずれか一つに記載された化学組成に従って製錬し、連続鋳造により鋳造スラブを鋳造し、連続鋳造中の冷却速度≧5℃/sである;
2) スラブ熱送、圧延
700℃以上の温度で、スラブを加熱炉に投入し、スラブを加熱し、加熱温度は1100~1250℃である;スラブの熱間圧延の最初二回のパスの圧下率≧55%である;最終圧延の温度は、850~950℃である;
3) 圧延後冷却、卷取り
圧延後に、水で冷却し、卷取り温度は550~630℃である;
4) 酸洗。 - ステップ4)の酸洗の後に、溶融亜鉛めっき焼鈍プロセスも含み、これによって、熱間圧延溶融亜鉛めっき鋼板完成品を得ることを特徴とする請求項9に記載された低ケイ素低炭素当量多相鋼板又は鋼帯の製造方法。
- 前記鋼板又は鋼帯の厚みは、0.7~4.0mmであることを特徴とする請求項9に記載された低ケイ素低炭素当量ギガパスカルレベル多相鋼板又は鋼帯の製造方法。
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| KR20230069426A (ko) * | 2021-11-12 | 2023-05-19 | 주식회사 포스코 | 굽힘성 및 신장 플랜지성이 우수한 초고강도 강판 및 이의 제조 방법 |
| CN117265376A (zh) | 2022-06-14 | 2023-12-22 | 宝山钢铁股份有限公司 | 一种1000MPa级高扩孔热轧复相钢钢板及其制造方法 |
| CN117344203A (zh) * | 2022-06-27 | 2024-01-05 | 宝山钢铁股份有限公司 | 一种抗拉强度800Mpa级热轧复相钢及其制造方法 |
| CN116219303B (zh) * | 2022-12-20 | 2025-10-21 | 攀钢集团攀枝花钢铁研究院有限公司 | 一种980MPa级热基镀锌复相钢及其制备方法 |
| CN116121641B (zh) * | 2022-12-20 | 2025-04-11 | 攀钢集团攀枝花钢铁研究院有限公司 | 一种780MPa级热基镀锌复相钢及其制备方法 |
| CN118326245A (zh) * | 2023-01-10 | 2024-07-12 | 宝山钢铁股份有限公司 | 一种点焊性能优异的带镀层吉帕钢及其制造方法 |
| CN116815064A (zh) * | 2023-07-10 | 2023-09-29 | 攀钢集团攀枝花钢铁研究院有限公司 | 一种980MPa级扩孔性能增强连退双相钢及其制备方法 |
| CN117051313B (zh) * | 2023-09-16 | 2025-08-26 | 湖南华菱湘潭钢铁有限公司 | 一种低C低Si软丝钢的冶炼方法 |
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| WO2014132968A1 (ja) | 2013-02-26 | 2014-09-04 | 新日鐵住金株式会社 | 焼き付け硬化性と低温靭性に優れた引張最大強度980MPa以上の高強度熱延鋼板 |
| WO2015129199A1 (ja) | 2014-02-27 | 2015-09-03 | Jfeスチール株式会社 | 高強度熱延鋼板およびその製造方法 |
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| Publication number | Publication date |
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| US12529124B2 (en) | 2026-01-20 |
| CN113122769B (zh) | 2022-06-28 |
| BR112022011028A2 (pt) | 2022-08-16 |
| EP4086362A1 (en) | 2022-11-09 |
| AU2020418007A1 (en) | 2022-07-21 |
| WO2021136355A1 (zh) | 2021-07-08 |
| CN113122769A (zh) | 2021-07-16 |
| EP4086362B1 (en) | 2025-04-02 |
| JP2023509410A (ja) | 2023-03-08 |
| KR20220119639A (ko) | 2022-08-30 |
| EP4086362A4 (en) | 2023-07-19 |
| US20230049380A1 (en) | 2023-02-16 |
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