JP2019505692A - 改善された強度、延性及び成形加工性を有する鋼板を製造するための方法 - Google Patents
改善された強度、延性及び成形加工性を有する鋼板を製造するための方法 Download PDFInfo
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Abstract
Description
・冷間圧延鋼板を用意するステップであって、
鋼の化学組成が、重量%により、
0.18%≦C≦0.25%、
0.9%≦Si≦1.8%、
0.02%≦Al≦1.0%、
1.5%≦Mn≦2.5%、
0.010%≦Nb≦0.035%、
0.10%≦Cr≦0.40%
を含有し、ただし、1.0%≦Si+Al≦2.35%であり、
残り部分が、Fe及び不可避的な不純物である、ステップ、
・50%〜80%のオーステナイト及び20%〜50%のフェライトを含む構造を得るように、アニーリング時間tAにわたってアニーリング温度TAで前記鋼板をアニーリングするステップ、
・20℃/秒〜50℃/秒の間に含まれる冷却速度で、Ms−50℃〜Ms−5℃の間に含まれる焼入れ温度QTまで前記鋼板を焼入れするステップ、
・前記鋼板を375℃〜450℃の間に含まれる分配温度PTに加熱し、少なくとも50秒の分配時間Ptにわたって前記鋼板を分配温度PTに維持するステップ、
・鋼板を室温に冷却するステップ
を含む、方法に関する。
0.18%≦C≦0.25%、
0.9%≦Si≦1.8%、
0.02%≦Al≦1.0%、
1.5%≦Mn≦2.5%、
0.010%≦Nb≦0.035%、
0.10%≦Cr≦0.40%
を含み、だたし、1.0%≦Si+Al≦2.35%であり、残り部分が、Fe及び不可避的な不純物である、化学組成を有する鋼板において、
前記鋼の微細構造が、面積の割合により、
・20%〜50%の二相域フェライト、
・10%〜20%の残留オーステナイト、
・25%〜45%の焼戻しされたマルテンサイト、
・ベイナイトであって、焼戻しされたマルテンサイト及びベイナイトの合計が30%〜60%の間に含まれる、
・10%〜20%のフレッシュマルテンサイト
からなる、鋼板にも関する。
Claims (21)
- 鋼板を製造するための方法であって、前記鋼板が、面積の割合により、20%〜50%の二相域フェライト、10%〜20%の残留オーステナイト、25%〜45%の焼戻しされたマルテンサイト、10%〜20%のフレッシュマルテンサイト、及びベイナイトからなり、焼戻しされたマルテンサイト及びベイナイトの合計が30%〜60%の間に含まれる微細構造を有し、以下の連続ステップ:
− 冷間圧延鋼板を用意するステップであって、鋼の化学組成が、重量%により、
0.18%≦C≦0.25%、
0.9%≦Si≦1.8%、
0.02%≦Al≦1.0%、
1.5%≦Mn≦2.5%、
0.010%≦Nb≦0.035%、
0.10%≦Cr≦0.40%
を含有し、ただし、1.0%≦Si+Al≦2.35%であり、
残り部分が、Fe及び不可避的な不純物である、ステップ、
− 50%〜80%のオーステナイト及び20%〜50%のフェライトを含む構造を得るように、アニーリング時間tAにわたってアニーリング温度TAで前記鋼板をアニーリングするステップ、
− 20℃/秒〜50℃/秒の間に含まれる冷却速度で、Ms−50℃〜Ms−5℃の間に含まれる焼入れ温度QTまで前記鋼板を焼入れするステップ、
− 前記鋼板を375℃〜450℃の間に含まれる分配温度PTに加熱し、少なくとも50秒の分配時間Ptにわたって前記鋼板を分配温度PTに維持するステップ、
− 前記鋼板を室温に冷却するステップ
を含む、方法。 - 前記鋼板が、焼入れの直後に、面積の割合により、少なくとも20%のオーステナイト、30%〜60%の間のマルテンサイト及び20%〜50%のフェライトからなる構造を有する、請求項1に記載の方法。
- 前記鋼の組成が、1.25%≦Si+Al≦2.35%であるような組成である、請求項1又は2に記載の方法。
- 前記鋼板を分配温度PTに維持するステップと、前記鋼板を室温に冷却するステップとの間に、前記鋼板を溶融めっきコーティングするステップをさらに含む、請求項1から3のいずれか一項に記載の方法。
- 分配温度PTが、400℃〜430℃の間に含まれる、請求項4に記載の方法。
- 分配時間Ptが、50秒〜150秒の間に含まれる、請求項4又は5に記載の方法。
- 溶融めっきコーティングするステップが、亜鉛めっきするステップである、請求項4から6のいずれか一項に記載の方法。
- 溶融めっきコーティングするステップが、480℃〜515℃の間に含まれる合金化温度GATによって合金化溶融亜鉛めっきするステップである、請求項4から6のいずれか一項に記載の方法。
- 分配時間Ptが、50秒〜140秒の間に含まれる、請求項8に記載の方法。
- 前記鋼板を室温に冷却するステップが、分配時間Ptにわたって前記鋼板を分配温度PTに維持するステップの直後に実施され、分配時間Ptが、少なくとも100秒である、請求項1から3のいずれか一項に記載の方法。
- 前記鋼板が、少なくとも10℃/秒の冷却速度で室温に冷却される、請求項1から10のいずれか一項に記載の方法。
- 前記鋼板が焼入れ温度QTに焼入れされた後、且つ前記鋼板が分配温度PTに加熱される前に、前記鋼板が、2秒〜8秒の間、好ましくは3秒〜7秒の間に含まれる保持時間にわたって焼入れ温度QTに保持される、請求項1から11のいずれか一項に記載の方法。
- 以下の化学組成を有する鋼板であって、重量%により:
− 0.18%≦C≦0.25%、
− 0.9%≦Si≦1.8%、
− 0.02%≦Al≦1.0%、
− 1.5%≦Mn≦2.5%、
− 0.010%≦Nb≦0.035%、
− 0.10%≦Cr≦0.40%
を含み、だたし、1.0%≦Si+Al≦2.35%であり、残り部分が、Fe及び不可避的な不純物である鋼板において、
前記鋼の微細構造が、面積の割合により、
− 20%〜50%の二相域フェライト、
− 10%〜20%の残留オーステナイト、
− 25%〜45%の焼戻しされたマルテンサイト、
− ベイナイトであって、焼戻しされたマルテンサイト及びベイナイトの合計は30%〜60%の間に含まれる、
− 10%〜20%のフレッシュマルテンサイト
からなる、鋼板。 - 440〜750MPaの間に含まれる降伏強度、少なくとも980MPaの引張強度、少なくとも20%の全伸び及び少なくとも20%の穴広げ率HERを有する、請求項13に記載の鋼板。
- 鋼の組成が、1.25%≦Si+Al≦2.35%であるような組成である、請求項13又は14に記載の鋼板。
- 残留オーステナイト中のC含量CRA%が、0.9%〜1.3%の間に含まれる、請求項13から15のいずれか一項に記載の鋼板。
- コーティングされた、請求項13から16のいずれか一項に記載の鋼板。
- Zn又はZn合金によってコーティングされた、請求項17に記載の鋼板。
- 前記鋼が、Al又はAl合金によってコーティングされている、請求項17に記載の鋼板。
- 亜鉛めっきされた、請求項18に記載の鋼板。
- 合金化溶融亜鉛めっきされた、請求項18に記載の鋼板。
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