JP7118972B2 - 非常に良好な成形性を有する焼戻しされた被覆鋼板及びこの鋼板を製造する方法 - Google Patents
非常に良好な成形性を有する焼戻しされた被覆鋼板及びこの鋼板を製造する方法 Download PDFInfo
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Description
・900Mpa以上、好ましくは1000Mpa超の極限引張強さと、
・17%以上の全伸びと、
・18%以上の穴広げ率と
を同時に有する鋼板を利用可能にすることによって、課題を解決することである。
・本発明による鋼組成物を用意するステップ、
・半製品をAc3超の温度に再加熱するステップ、
・熱間圧延仕上げ温度を750℃~1050℃にすべきオーステナイト域で前記半製品を圧延して、熱間圧延鋼板を得るステップ、
・20~150℃/秒の冷却速度で前記板を600℃以下の冷却温度に冷却し、前記熱間圧延板をコイル化するステップ、
・前記熱間圧延板を室温に冷却するステップ、
・任意選択的に、前記熱間圧延鋼板にスケール除去工程を実施するステップ、
・400℃~750℃の温度でアニーリングを熱間圧延鋼板に実施するステップ、
・任意選択的に、前記アニーリングされた熱間圧延鋼板にスケール除去工程を実施するステップ、
・30~80%の圧延率によって前記アニーリングされた熱間圧延鋼板を冷間圧延して、冷間圧延鋼板を得るステップ、
・次いで、1~20℃/秒の速度で前記冷間圧延鋼板をAe1~Ae3のソーキング温度に加熱し、600秒未満の間保持するステップ、
・次いで、5℃/秒超の速度で前記板をMs超で475℃未満の温度に冷却し、20~400秒の間保持するステップ、
・次いで、200℃/秒以下の冷却速度で前記鋼板を室温に冷却するステップ、
・次いで、1℃/秒~20℃/秒の速度でアニーリングされた鋼板を440℃~600℃のソーキング温度に再加熱し、100秒未満の間保持し、次いで、焼戻し及び被覆のための浴による亜鉛又は亜鉛合金被覆のときに前記鋼板を溶融めっきするステップ、
・1℃/秒~20℃/秒の冷却速度で焼戻しされた被覆鋼板を室温に冷却するステップ
を含む、本発明による方法を使用することが好ましい。
アニーリング処理を実施する前に、すべての本発明の鋼及び基準品を1000℃~1280℃の温度に再加熱し、次いで、850℃超の仕上げ圧延温度によって熱間圧延を施した後、580℃未満の温度でコイル化した。次いで、熱間圧延コイルを上述のように加工した後、厚さが30~80%薄くなるように冷間圧延した。次いで、これらの冷間圧延鋼板を、下記に示すアニーリングステップ及び焼戻しステップに供した。
すべての試料の最終的なミクロ組織は、通常の規格に従って実施される試験を用いて、走査型電子顕微鏡等の相異なる顕微鏡によって判定された。結果は、下記にまとめられている。
すべての本発明の鋼及び比較用の鋼に関する下記の機械的特性を判定した。
UTS:極限引張強さ
Tel:全伸び
HER:穴広げ率
Claims (11)
- 重量百分率として表される次の元素
0.17%≦炭素≦0.25%、
1.8%≦マンガン≦2.3%、
0.5%≦ケイ素≦2.0%、
0.03%≦アルミニウム≦1.2%、
硫黄≦0.03%、
リン≦0.03%
を含み、
次の任意選択的な元素
クロム≦0.4%、
モリブデン≦0.3%、
ニオブ≦0.04%、
チタン≦0.1%
の一種以上を含有してもよい、
組成を有する、焼戻しされた被覆鋼板であって、
残りの組成が、鉄及び処理によって生じた不可避的な不純物から構成され、前記鋼板のミクロ組織が、面積の割合により、3~20%の残留オーステナイト、少なくとも15%のフェライト、40~85%の焼戻しベイナイト及び最低5%の焼戻しマルテンサイトからなり、焼戻しマルテンサイト及び残留オーステナイトの合計量が、10~30%であり、残留オーステナイト、フェライト、焼戻しベイナイト及び焼戻しマルテンサイトの合計量が100%である、
焼戻しされた被覆鋼板。 - 前記組成が、0.6%~1.8%のケイ素を含む、請求項1に記載の焼戻しされた被覆鋼板。
- 前記組成が、0.03%~0.6%のアルミニウムを含む、請求項1又は2に記載の焼戻しされた被覆鋼板。
- 焼戻しマルテンサイト及び残留オーステナイトの合計量が、10%~25%である、請求項1から3のいずれか一項に記載の焼戻しされた被覆鋼板。
- 焼戻しマルテンサイト及び残留オーステナイトの合計量が、15%以上であり、焼戻しマルテンサイトの百分率が、10%より高い、請求項1から4のいずれか一項に記載の焼戻しされた被覆鋼板。
- 残留オーステナイトの炭素含量が、0.9~1.1%である、請求項1から5のいずれか一項に記載の焼戻しされた被覆鋼板。
- 900Mpa超の極限引張強さ、18%超の穴伸び率及び17%超の全伸びを有する、請求項1から6のいずれか一項に記載の焼戻しされた被覆鋼板。
- 1000Mpa~1100Mpaの極限引張強さ及び20%超の穴広げ率を有する、請求項7に記載の焼戻しされた被覆鋼板。
- 次の連続するステップ
請求項1から3のいずれか一項に記載の鋼組成物を用意するステップ、
Ac3超の温度に半製品を再加熱するステップ、
熱間圧延仕上げ温度を750℃~1050℃にすべきオーステナイト域で前記半製品を圧延して、熱間圧延鋼板を得るステップ、
20~150℃/秒の冷却速度で前記鋼板を600℃以下のコイル化温度に冷却し、及び前記熱間圧延鋼板をコイル化するステップ、
前記熱間圧延鋼板を室温に冷却するステップ、
任意選択的に、前記熱間圧延鋼板にスケール除去工程を実施するステップ、
400℃~750℃の温度でアニーリングを熱間圧延鋼板に実施するステップ、
任意選択的に、前記アニーリングされた熱間圧延鋼板にスケール除去工程を実施するステップ、
30~80%の圧延率によって前記アニーリングされた熱間圧延鋼板を冷間圧延して、冷間圧延鋼板を得るステップ、
次いで、1~20℃/秒の速度で前記冷間圧延鋼板をAe1~Ae3のソーキング温度に加熱し、600秒未満の間保持するステップ、
次いで、5℃/秒超の速度で前記板をMs超で475℃未満の温度に冷却し、20~400秒の間このような温度に前記冷間圧延鋼板を保持するステップ、
次いで、200℃/秒以下の冷却速度で前記鋼板を室温に冷却するステップ、
次いで、1℃/秒~20℃/秒の速度で前記アニーリングされた鋼板を440℃~600℃のソーキング温度に再加熱し、100秒未満の間保持し、次いで、焼戻し及び被覆のための浴による亜鉛又は亜鉛合金被覆のときに前記鋼板を溶融めっきするステップ、
1℃/秒~20℃/秒の冷却速度で前記焼戻しされた被覆鋼板を室温に冷却するステップ
を含む、焼戻しされた被覆鋼板の製造の方法であって、
焼戻しされた被覆鋼板が、900Mpa超の極限引張強さ、18%超の穴伸び率及び17%超の全伸びを有する、方法。 - コイル化温度が、400℃超である、請求項9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から8のいずれか一項に記載の鋼板又は請求項9若しくは10に記載の方法によって製造された鋼板の使用。
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