JP6359155B2 - プレス硬化した被覆鋼製部品を製造するための方法および該部品の製造を可能にするプレコート鋼板 - Google Patents
プレス硬化した被覆鋼製部品を製造するための方法および該部品の製造を可能にするプレコート鋼板 Download PDFInfo
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Description
1.2mm厚の冷間圧延鋼板を調達し、その組成は、重量パーセント(%)において表して、以下であり、残部は鉄および処理から生じる不可避的不純物からなる。
鋼板が1.8mmの厚さを有し、溶融めっきコーティング後に540℃に再加熱しなかった、この結果としてそれらのコーティングはガルバナイジングされており、ガルバニーリングされてはいないことを除いて、上述の方法を用いて亜鉛でプレコーティングされた鋼板を作製した。
Claims (18)
- 0.5から2.6mmの間の厚さを有する、冷間圧延および焼鈍された鋼板であって、プレス硬化部品の作製のためにプレコーティングされており、重量により表して0.07%から0.5%の間の炭素含有量C0を有する熱処理用鋼基材、および鋼基材の少なくとも2つの主要面の上の金属プレコーティングであって、アルミニウムまたはアルミニウム合金または亜鉛または亜鉛合金である、または亜鉛もしくは亜鉛合金の層で覆われたアルミニウムもしくはアルミニウム基合金の層で構成されている金属プレコーティングで構成されている鋼板であって、
鋼基材の組成が、重量パーセントで表して、
0.07%≦C≦0.5%
0.5%≦Mn≦3%
0.02%≦Si≦0.5%
0.01%≦Cr≦1%
Ti≦0.2%
Al≦0.25%
S≦0.05%
P≦0.1%
0.0005%≦B≦0.010%、
0.0005%≦Ca≦0.005%
を含有し、組成の残部が鉄および処理から生じる不可避的不純物からなり、
この基材が2つの主要面の各表面に脱炭領域を含み、この脱炭領域の深さp50%は6から30マイクロメートルの間であり、p50%は炭素含有量が含有量C0の50%に等しい深さであり、また鋼板が基材と金属プレコーティングの間に酸化鉄の層を含有せず、また鋼基材が、酸素含有量O0を有し、またプレコーティングと基材の間の界面の下で、界面から開始して0から5マイクロメートルの間に位置する深さにおいて、平均酸素含有量Omを有し、ここでOm/O0が15より大きいことを特徴とする、鋼板。 - 鋼基材の組成が、重量パーセントで表して、
0.09%≦C≦0.38%
0.8%≦Mn≦1.5%
0.1%≦Si≦0.35%
0.01%≦Cr≦0.3%
0.02%≦Ti≦0.1%
0.001%≦Al≦0.25%
S≦0.05%
P≦0.1%
0.002%≦B≦0.005%、
0.0005%≦Ca≦0.005%
を含有し、組成の残部が鉄および処理から生じる不可避的不純物からなることを特徴とする、請求項1に記載のプレコート鋼板。 - 鋼基材の組成が、重量パーセントで表して、
0.15%≦C≦0.25%
を含有することを特徴とする、請求項1または2に記載のプレコート鋼板。 - 基材が、プレコーティングと基材の間の界面の下0から5マイクロメートルの間に位置する領域において、チタン、ケイ素、マンガン、アルミニウム、クロムからなる群から選択される少なくとも1種の元素を含む酸化物を含有し、ここでこの領域における1マイクロメートル超の直径を有する酸化物の密度が50/mm2より大きいことを特徴とする、請求項1から3のいずれかに記載のプレコート鋼板。
- 下に列挙するステップ、
− 0.07から0.5%の間の炭素含有量C0および酸素含有量O0を有する、0.5から2.6mmの間の厚さを有する熱処理用の冷間圧延鋼板を調達するステップであって、
鋼基材の組成が、重量パーセントで表して、
0.07%≦C≦0.5%
0.5%≦Mn≦3%
0.02%≦Si≦0.5%
0.01%≦Cr≦1%
Ti≦0.2%
Al≦0.25%
S≦0.05%
P≦0.1%
0.0005%≦B≦0.010%、
0.0005%≦Ca≦0.005%
を含有し、組成の残部が鉄および処理から生じる不可避的不純物からなるステップ、次いで
− 圧延鋼を焼鈍して、焼鈍の完了時に、6から30マイクロメートルの間の深さp50%にわたる鋼板の表面の脱炭を得て、ここでp50%は炭素含有量が含有量C0の50%に等しい深さであり、その表面に酸化鉄層を有しない鋼板を得て、焼鈍の完了時に、基材中に、プレコーティングと基材の間の界面の下で、界面から測定して0から5マイクロメートルの間の深さにおいて、平均酸素含有量Omを得て、ここでOm/O0が15より大きいステップ、次いで
− 鋼板を基材としての役割を果たす焼鈍された鋼上で金属または金属合金を用いてプレコーティングするステップ、次いで
− この鋼板を切断してブランクを得るステップ、次いで
− このブランクを炉中において温度TRに加熱して、鋼に少なくとも部分的にオーステナイト組織を与えるステップ、次いで
− この加熱したブランクを炉から取り出し、プレス機または成形装置内に移すステップ、次いで
− このブランクを熱間成形またはホットサイジングして、部品を得るステップ、次いで
− この部品をプレス機または成形装置内で冷却して、硬化により部品にマルテンサイトまたはベイナイト−マルテンサイトミクロ組織を与えるステップ
を含む、被覆され硬化した鋼製部品の作製のための方法であって、
焼鈍の条件が、以下のi)およびii)のいずれか:
i)以下のステップ:
− この冷間圧延鋼板を調達した後、ラジアントチューブ炉もしくは抵抗炉もしくは誘導炉またはこれらの手段の少なくとも任意の2つを併せ持つ炉中を鋼板が移動する際に、雰囲気A1が2から15体積%の水素を含有し、残部が窒素および不可避的不純物であり、雰囲気A1が−60から−15℃の間の露点を有する、この炉の帯域において、鋼板が600℃からAc1+40℃の間の温度T1aに予熱され、ここでAc1は、鋼の加熱中のオーステナイト変態の開始温度を指示するステップ、次いで
− この鋼板を温度T1aから、720から860℃の間の温度T2aに加熱し、液体の水、水蒸気または酸素から選択される少なくとも1種の要素を温度T1aにおいて開始してこの炉に注入して、この温度T1aから温度T2aの間の炉の区域において、鉄にとって酸化性である雰囲気A2bを得て、ここで鋼板が温度T1aである瞬間と鋼板が温度T2aに達した瞬間の間の時間間隔が30秒以上であるステップ、次いで
− 鋼板を次いで、鉄にとって還元性である雰囲気A3下で、T2aからT2a+40℃の間の温度Tmにおいて保持し、ここでこの雰囲気A2bにおいて形成された酸化鉄の層の完全な還元が温度Tmにおける保持の終了までに起こるステップ、次いで
− この鋼板を、鉄の表面再酸化が起こらないように、雰囲気A4において温度T3に冷却するステップ、次いで
− 鋼板を次いで温度Tbmである金属浴中の浸漬コーティングによりプレコーティングし、ここで温度T3はTbm−10℃からTbm+50℃の間であることが理解されるステップ、
を連続して含むか、または
ii)以下のステップ:
− 冷間圧延鋼板を調達した後、鋼板が炉中を移動する際に鋼板が予熱され、予熱は直火により加熱された炉の帯域において行われ、ここで、空気/ガス比が1から1.2の間である空気と天然ガスの混合物の燃焼から生じる雰囲気において、鋼板は550から750℃の間の温度T1bに予熱されるステップ、次いで
− 雰囲気が3から40体積%の水素を含有し、残部は窒素および不可避的不純物であり、ここで露点は−30℃未満である、ラジアントチューブもしくは抵抗もしくは誘導またはこれらの手段の少なくとも2つの任意の組合せにより加熱された炉の第2の帯域において、鋼板を温度T1bから、760から830℃の間の温度T2bに加熱し、ここで鋼板が温度T1bである瞬間と鋼板が温度T2bに達した瞬間の間の時間間隔が少なくとも30秒であるステップ、次いで
− 鉄にとって還元性である雰囲気A3下で、この鋼板をT2bからT2b+40℃の間の温度Tmにおいて保持するステップ、次いで
− この鋼板を、鉄の表面再酸化が起こらないように、雰囲気A4において温度T3に冷却するステップ、次いで
− 鋼板を次いで温度Tbmである金属浴中の浸漬コーティングによりプレコーティングし、ここで温度T3はTbm−10℃からTbm+50℃の間であることが理解されるステップ、
を連続して含む
ことを特徴とする方法。 - 雰囲気A1が3−5体積%の水素を含有する、請求項5に記載の方法。
- 浴を通過させることによる溶融めっき法を用いて、プレコーティングを連続的に行うことを特徴とする、請求項5または6に記載の作製方法。
- コーティングがアルミニウムまたはアルミニウム合金であることを特徴とする、請求項5から7のいずれかに記載の作製方法。
- コーティングが亜鉛または亜鉛合金であることを特徴とする、請求項5から7のいずれかに記載の作製方法。
- 金属プレコーティングが、亜鉛または亜鉛合金の層で覆われたアルミニウムまたはアルミニウム基合金の層で構成されていることを特徴とする、請求項5から7のいずれかに記載の作製方法。
- 深さp50%が、9から30マイクロメートルの間であることを特徴とする、請求項5から10のいずれかに記載の作製方法。
- 深さp 50% が、12から30マイクロメートルの間であることを特徴とする、請求項11に記載の作製方法。
- プレコーティングされた鋼板を切断してブランクを得るステップの後で、ブランクを炉中において温度TRに加熱するステップの前に、ブランクをコールドスタンピングすることを特徴とする、請求項5から12のいずれかに記載の方法。
- 鋼基材の組成が、重量パーセントで表して、
0.15%≦C≦0.25%
を含有することを特徴とする、請求項5から13のいずれかに記載の方法。 - この温度TRが、鋼のAc3温度以上であることを特徴とする、請求項5から14のいずれかに記載の作製方法。
- 冷間圧延鋼板が焼鈍されて、焼鈍の完了時に、基材中に、プレコーティングと基材の間の界面の下で、界面から測定して0から5マイクロメートルの間の深さにおいて、チタン、ケイ素、マンガン、アルミニウム、クロムからなる群から選択される少なくとも1種の元素を含む酸化物を得て、ここでこの領域における1マイクロメートルより大きい直径を有する酸化物の密度が50/mm2より大きいことを特徴とする、請求項5から15のいずれかに記載の作製方法。
- 温度T1aが、鋼基材の加熱中のオーステナイト変態温度であるAc1より高いことを特徴とする、請求項5から16のいずれかに記載の作製方法。
- 温度T2bがAc1より高いことを特徴とする、請求項17に記載の作製方法。
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