JP2019510880A - 高延性を有する低密度及び高強度のオーステナイト系鋼ストリップ又はシート、該鋼の製造方法及びその用途 - Google Patents
高延性を有する低密度及び高強度のオーステナイト系鋼ストリップ又はシート、該鋼の製造方法及びその用途 Download PDFInfo
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Abstract
Description
重量%で、
0.65〜1.2%のC;
0〜0.5%のSi;
5.0〜20.0%のMn;
5.5〜11.0%のAl;
0.001〜0.05%のN;
0.02%以下のP;
0.02%以下のS;
を含み、
必要に応じて、
0.001〜0.01%のCa;
0.01〜0.2%のTi;
0〜5.0%のCr;
0〜10.0%のNi;
0〜2.0%のCu;
0〜1.0%のMo;
0〜0.5%のV;
0〜0.2%のNb;
0〜0.2%のZr;
0〜0.0050%のB;
0〜0.2%のSb;
の1種以上を含み、
残部がFe及び不可避的不純物であり、
面積%で、70%〜100%のオーステナイト、30〜0%のフェライト及び0〜5%のκ−(Fe,Mn)3AlC−炭化物相を含むミクロ組織を有し、
降伏比(YS/UTS)が0.60以上であり、
Mn/Si比が>40である、前記鋼ストリップ又はシートを提供することにより達成される。また、上記目的は、請求項10に記載の前記鋼を製造する方法によって達成される。
1)κ−炭化物析出物を有する又は有しない、微細な粒度を有する完全に再結晶化したオーステナイト系ミクロ組織;
2)κ−炭化物析出物を有する又は有しない、回復されたオーステナイト系ミクロ組織;
3)規則化(ordering)又は金属間相析出物を生成するための、フェライト(面積で30%未満)の導入;
4)強度を高めるための、ε(hcp)又はαマルテンサイト(面積で50%未満)の導入。
αマルテンサイトの量は、面積で40%未満であることが好ましい。
0.65〜1.2%のC;
0〜0.5%のSi;
5.0〜20.0%のMn;
5.5〜11.0%のAl;
0.001〜0.05%のN;
0.02%以下のP;
0.02%以下のS;
を含み、
必要に応じて、
0.001〜0.01%のCa;
0.01〜0.2%のTi;
0〜5.0%のCr;
0〜10.0%のNi;
0〜2.0%のCu;
0〜1.0%のMo;
0〜0.5%のV;
0〜0.2%のNb;
0〜0.2%のZr;
0〜0.0050%のB;
0〜0.2%のSb;
の1種以上を含み、
残部がFe及び不可避的不純物であり、
Mn/Si比が>40である、高延性を有する軽量及び高強度のオーステナイト系鋼ストリップ又はシートを製造する方法は、
連続鋳造法、インゴット鋳造法又はストリップ鋳造法により厚い又は薄いスラブを製造する工程と、
スラブ、インゴット又はストリップの温度を1050〜1250℃に加熱(又は再加熱)又は均質化(homogenising)する工程と、
1050℃を超える熱間圧延開始温度及び850℃を超える仕上圧延温度(finish rolling temperature)で熱間圧延を行う工程と、
次いで行われる
(1)1℃/sより高い冷却速度、好ましくは15℃/sより高い冷却速度で200℃未満の温度に冷却し、次いで、ストリップを巻く工程、又は
(2)1℃/sより高い冷却速度、好ましくは15℃/sより高い冷却速度で450℃〜700℃の範囲の温度に冷却し、次いで、ストリップを850〜1100℃の温度でアニーリングし、次いで、1℃より高い冷却速度、好ましくは15℃/sより高い冷却速度で200℃未満の温度に冷却し、次いで、ストリップを巻く工程と
を含む。ストリップの冷却及びアニーリングの間において、ストップは冷却後に巻かれてもよいし、アニーリングの直前まで巻かれていなくてもよい。
コイル状の鋼シートを総圧下率30%〜80%で冷間圧延する工程、
冷間圧延された鋼シートを1℃/s〜50℃/sの速度で650〜1100℃の範囲のアニーリング温度まで5秒〜5時間加熱した後、
アニーリングされた鋼シート板を1℃/s〜100℃/sの速度で冷却する工程
をさらに含む。
表1に示す組成を有する鋼を鋳造した。インゴットを1200℃で2時間再加熱し、次いで、30mmとなるまで第1の熱間圧延工程に供した。これらの粗圧延されたスラブを1200℃で30分間再加熱し、次いで、900℃の仕上圧延温度で9〜10パスで3mmとなるまで熱間圧延し、空気中又は水中で急冷することによって室温に冷却した。引張試験は、ISO 6892−1規格(小さなEUROノルムサンプル(small EURO norm samples)、ゲージ長さ50mm)に従う300kN Denison Mayes サーボ−油圧試験機(servo-hydraulic testing machine)を用いて室温で行った。様々なアニーリング処理後の熱間圧延されたストリップの引張特性を表2に示す。
次に、合金18及び19の熱間圧延された鋼ストリップを、3〜1mmの67%の圧下率の冷間圧延に供し、次いで、それぞれ、650℃、750℃、800℃及び850℃で、様々な時間、アニーリングした。冷間圧延及びアニーリングされたシートの引張特性を表3に示す。
Claims (20)
- 高延性を有する低密度及び高強度のオーステナイト系鋼ストリップ又はシートであって、
重量%で、
0.65〜1.2%のC;
0〜0.5%のSi;
5.0〜20.0%のMn;
5.5〜11.0%のAl;
0.001〜0.05%のN;
0.02%以下のP;
0.02%以下のS;
を含み、
必要に応じて、
0.001〜0.01%のCa;
0.01〜0.2%のTi;
0〜5.0%のCr;
0〜10.0%のNi;
0〜2.0%のCu;
0〜1.0%のMo;
0〜0.5%のV;
0〜0.2%のNb;
0〜0.2%のZr;
0〜0.0050%のB;
0〜0.2%のSb;
の1種以上を含み、
残部がFe及び不可避的不純物であり、
面積%で、70%〜100%のオーステナイト、30〜0%のフェライト及び0〜5%のκ−(Fe,Mn)3AlC−炭化物相を含むミクロ組織を有し、
降伏比(YS/UTS)が0.60以上であり、
Mn/Si比が>40である、前記鋼ストリップ又はシート。 - モリブデン含有量が0.04%以下である、請求項1に記載の低密度及び高強度の鋼。
- ニッケル含有量が不純物レベルであり、好ましくはニッケル含有量が0である、請求項1又は2に記載の低密度及び高強度の鋼。
- M7C3等の他の炭化物の量が、面積で1%未満である、請求項1〜3のいずれか一項に記載の低密度及び高強度の鋼。
- M7C3炭化物のサイズが、直径で1μm未満である、請求項1〜4のいずれか一項に記載の低密度及び高強度の鋼。
- 7.3g/cm3未満の密度を有する、請求項1〜5のいずれか一項に記載の低密度及び高強度の鋼。
- 750MPa以上の引張強度を有する、請求項1〜6のいずれか一項に記載の低密度及び高強度の鋼。
- 25%以上の伸び(ゲージ長さ50mm)を有する、請求項1〜7のいずれか一項に記載の低密度及び高強度の鋼。
- Mn/Siが>50である、請求項1〜8のいずれか一項に記載の低密度及び高強度の鋼。
- 重量%で、
0.65〜1.2%のC;
0〜0.5%のSi;
5.0〜20.0%のMn;
5.5〜11.0%のAl;
0.001〜0.05%のN;
0.02%以下のP;
0.02%以下のS;
を含み、
必要に応じて、
0.001〜0.01%のCa;
0.01〜0.2%のTi;
0〜5.0%のCr;
0〜10.0%のNi;
0〜2.0%のCu;
0〜1.0%のMo;
0〜0.5%のV;
0〜0.2%のNb;
0〜0.2%のZr;
0〜0.0050%のB;
0〜0.2%のSb;
の1種以上を含み、
Mn/Si比が>40であり、
残部がFe及び不可避的不純物である、高延性を有する軽量及び高強度のオーステナイト系鋼ストリップ又はシートを製造する方法であって、
連続鋳造法、インゴット鋳造法又はストリップ鋳造法により厚い又は薄いスラブを製造する工程と、
スラブ、インゴット又はストリップの温度を1050〜1250℃に加熱(又は再加熱)又は均質化する工程と、
1050℃を超える熱間圧延開始温度で、50%の総圧下率まで第1の熱間圧延を行う工程と、
最終熱間圧延厚さまで第2の熱間圧延を行う工程であって、仕上圧延温度が850℃より高い温度である工程と、
次いで行われる
(1)1℃/sより高い冷却速度で200℃未満の温度に冷却し、次いで、ストリップを巻く工程、又は
(2)15℃/sより高い冷却速度で450℃〜700℃の範囲の温度に冷却し、次いで、ストリップを巻き、ストリップを800〜1100℃の温度でアニーリングし、次いで、1℃より高い冷却速度で200℃未満の温度に冷却する工程と
を含む、方法。 - Mn/Siが>50である、請求項10に記載の方法。
- Mo含有量が0.04%以下である、請求項10又は11に記載の方法。
- ニッケル含有量が不純物レベルであり、好ましくはニッケル含有量が0である、請求項10〜12のいずれか一項に記載の方法。
- 熱間圧延された鋼シートを巻き取った後、
総圧下率が30〜80%の冷間圧延を行う工程、
冷間圧延された鋼シートを、1℃/s〜50℃/sの速度で、650〜1100℃の範囲のアニーリング温度に5秒〜5時間加熱する工程、
アニーリングされた鋼シートを、1℃/s〜100℃/sの速度で冷却する工程
をさらに含む、請求項10〜13のいずれか一項に記載の方法。 - Zn、Zn−Fe、Zn−Al、Zn−Mg、Zn−Al−Mg、Al−Si及びAl−Mg−Siから選択される金属コーティングを、鋼シートの一方又は両方の面にめっきする工程をさらに含み、一方又は両方のコーティング層の厚さが10〜200μmである、請求項10〜14のいずれか1項に記載の方法。
- 熱間圧延されたストリップ及び冷間圧延されたストリップが、50%未満の制御された量のマルテンサイトを得るために、零下温度まで低温処理される、請求項10〜15のいずれか一項に記載の方法。
- 熱間圧延されたストリップ又は冷間圧延されたストリップが低温処理される、請求項16に記載の方法であって、熱間圧延されたストリップ又は冷間圧延されたシートが、微細なオーステナイト系結晶粒度を有する完全に再結晶化された構造を得るために、単一のオーステナイト領域内の温度、好ましくは850〜1100℃の温度範囲の温度で、5秒〜30分間、アニーリングされ、アニーリングされたシートが、炭化物の形成を防止するために、1℃/sよりも高い冷却速度で室温まで冷却され、次いで、マルテンサイト変態を導入するために、深冷処理、好ましくは液体N2中で深冷処理され、好ましくは−100℃以下に冷却される、方法。
- 前記低温処理が、前記低温処理の温度で20mJ/m2未満の積層欠陥エネルギーを有する熱間圧延されたストリップ又は冷間圧延されたストリップを用いて実施される、請求項16又は17に記載の方法。
- 請求項1〜9のいずれか一項に記載の鋼ストリップ若しくはシート、又は、請求項10〜18のいずれか一項に記載の方法によって製造された鋼ストリップ若しくはシートの、高強度自動車部品等の自動車部品を製造するための使用。
- 請求項19に記載の部品の使用。
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JP2014501852A (ja) * | 2010-12-13 | 2014-01-23 | ポスコ | 降伏比及び延性に優れたオーステナイト系軽量高強度鋼板及びその製造方法 |
KR20150075501A (ko) * | 2013-12-26 | 2015-07-06 | 주식회사 포스코 | 고강도 저비중 강판 및 그 제조방법 |
CN104674109A (zh) * | 2015-03-11 | 2015-06-03 | 北京科技大学 | 一种低密度Fe-Mn-Al-C系冷轧汽车用钢板及制备方法 |
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EP3423608A1 (en) | 2019-01-09 |
EP3423608B1 (en) | 2019-11-13 |
KR20180121891A (ko) | 2018-11-09 |
WO2017148892A1 (en) | 2017-09-08 |
CN108779528A (zh) | 2018-11-09 |
CN108779528B (zh) | 2021-04-16 |
US11078555B2 (en) | 2021-08-03 |
US20190055622A1 (en) | 2019-02-21 |
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