JP2018524471A - 高強度溶融亜鉛めっき鋼帯 - Google Patents
高強度溶融亜鉛めっき鋼帯 Download PDFInfo
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- JP2018524471A JP2018524471A JP2017567681A JP2017567681A JP2018524471A JP 2018524471 A JP2018524471 A JP 2018524471A JP 2017567681 A JP2017567681 A JP 2017567681A JP 2017567681 A JP2017567681 A JP 2017567681A JP 2018524471 A JP2018524471 A JP 2018524471A
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- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
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Abstract
Description
0.10〜0.21%のC
1.75〜2.50%のMn
0.04〜0.60%のSi
0.20〜1.40%のAl
0.001〜0.025%のP
0.0005〜0.0050%のB
0.50%以下のCr
0.20%以下のTi
0.004%以下のCa
0.015%以下のN
Fe及び不可避的不純物である残部
からなる高強度溶融亜鉛めっき鋼帯を提供することにより満たされる。
炭素は、従来の焼鈍/亜鉛めっきラインで利用可能な冷却速度での焼入性及びマルテンサイト形成を保証にするのに十分に高い量で存在する必要がある。マルテンサイトは、十分な強度を実現するために要求される。また、遊離炭素は、向上した加工硬化の可能性及び生じた強度レベルに対する良好な成形性を実現する、オーステナイトの安定化を可能とする。0.10質量%という下限は、これらの理由で必要とされる。0.21質量%という上限は、良好な溶接性を保証するために必要であることが見出されている。
マンガンは、焼入性を増加させ、これにより、従来の連続焼鈍/亜鉛めっきラインの冷却速度能力内でマルテンサイト又はベイナイトのようなハード相の形成を容易にするために添加される。また、マンガンは、引張強度を増加させるとともにフェライト相を強化する固溶強化に寄与するとともに、残留オーステナイトの安定化を助ける。マンガンは、二相鋼の変態温度範囲を低下させ、これにより、要求される焼鈍温度を従来の連続焼鈍/亜鉛めっきラインで容易に実現可能なレベルまで低下させる。1.75質量%という下限は、上記理由で必要とされる。この下限は、その他の元素(例えば、ホウ素)の添加を考慮して可能である。2.50質量%という上限は、柔らかい変態生成物(フェライト及びパーライト)への二相鋼の十分な変態を保証することにより、熱間圧延機で許容可能な圧延荷重を保証するために、及び、冷間圧延機で許容可能な圧延荷重を保証するために課される。また、この上限は、鋳造におけるより強い偏析(segregation)及び鋼帯におけるより高いレベルでのマルテンサイトのバンド形成を考慮して与えられる。好ましくは、マンガンの量は、好ましくは1.9〜2.3質量%、より好ましくは2.0〜2.2質量%である。
ケイ素は、固溶強化を実現し、これにより、フェライトマトリックスの強化を通じて、高強度の実現及びオーステナイトの安定化を可能とする。ケイ素は、過時効における炭化物の形成を極めて効果的に抑制し、これにより、オーステナイトの安定化のために炭素を溶解状態に維持する(keep carbon in solution)。これらの理由から、0.04質量%という下限が必要とされる。高濃度のケイ素は、付着性の低減により許容できない被覆品質を生じるため、0.60質量%という上限は、鋼帯の被覆性を考慮して課される。
アルミニウムは、脱酸の目的で溶鋼に添加される。適切な量であれば、アルミニウムは、ベイナイト変態の促進を実現し、これにより、従来の連続焼鈍/亜鉛めっきラインの焼鈍セクションにより課される時間的制約内でベイナイト形成を可能とする。また、アルミニウムは、炭化物の形成を抑制し、これにより、炭素を溶解状態に維持し、これにより、過時効におけるオーステナイトへの分配を生じるとともに、オーステナイトの安定化を促進する。0.20質量%という下限は、上記理由で要求される。高アルミニウム量は、鋳造モールドスラグの弊害及びその結果としてモールドスラグ粘度の増加を生じ、鋳造における不正確な伝熱及び潤滑を生じるため、1.40質量%という上限は、鋳造性のために課される。
クロムは、焼入性を増加させるために添加される。クロムは、フェライト形成を促進させる。0.50質量%という上限は、残留オーステナイトを犠牲にして多過ぎないマルテンサイトが形成することを保証するために課される。クロムを添加しないことも可能である。Crの量は、好ましくは0.01〜0.40質量%、より好ましくは0.02〜0.25質量%である。
チタンは、主として、鋼の強化のために添加される。0.20%という上限は、鋼のコストを制限するために課される。Tiを添加しないことも可能である。
カルシウムの添加は、硫化マンガン介在物の形態を修正する。カルシウムが添加されると、介在物は、細長形状(elongated shape)よりもむしろ球状(globular)となる。細長形状の介在物は、ストリンガー(stringer)とも呼ばれ、弱面(planes of weakness)として作用する場合があり、弱面に沿ってラメラテイヤ(lamellar tearing)及び剥離破壊(delamination fracture)が生じる場合がある。ストリンガーの回避は、孔を広げること又はフランジを伸ばすことを伴い、等方性成形挙動を促進する鋼シートの成形プロセスにとって有益である。また、カルシウム処理は、アルミニウム脱酸鋼タイプにおける硬く、角ばった、研磨性のアルミナ介在物の形成を防止し、代わりに、圧延温度においてより柔らかく、球状のアルミン酸カルシウム介在物を形成し、それによって、材料の加工特性を向上させる。連続鋳造装置において、溶鋼で生じるいくつかの介在物は、ノズルをブロックし、アウトプットの損失及びコストの増加を生じる傾向を有する。カルシウム処理は、キャスターノズル(caster nozzle)の動作を妨げない低融点種の形成を促進することによりブロックの傾向を低減する。硫黄含有量が非常に低い場合にはカルシウムを加えないことも可能である。好ましくは、Ca量は0.0005〜0.003質量%である。
リンは、炭化物の形成を抑制するため、鋼中のある程度のリンは有利である。しかしながら、リンは、溶接の際、鋼を脆弱にする可能性があるため、リンの量は、鋼製造において、特に、その他の脆弱化元素(例えば、硫黄及び窒素)との組み合わせにおいて、注意深くコントロールされるべきである。一方、ホウ素の添加を考慮して、通常よりも多くのリンを鋼に添加することが可能である。
Claims (14)
- 質量%で、以下の元素:
0.10〜0.21%のC
1.75〜2.50%のMn
0.04〜0.60%のSi
0.20〜1.40%のAl
0.001〜0.025%のP
0.0005〜0.0050%のB
0.50%以下のCr
0.20%以下のTi
0.004%以下のCa
0.015%以下のN
Fe及び不可避的不純物である残部
からなる、高強度溶融亜鉛めっき鋼帯。 - Al及びSiの量が0.60%<Al+Si<1.40%となるように選択される、及び/又は、Mn及びCrの量がMn+Cr>2.00%となるように選択される、及び/又は、Al及びSiの量がSi≦Alとなるように選択される、請求項1に記載の鋼帯。
- 元素Cが、0.13〜0.18%の量で、好ましくは0.14〜0.17%の量で存在する、請求項1又は2に記載の鋼帯。
- 元素Siが、0.05〜0.50%の量で、好ましくは0.05〜0.40%の量で存在する、請求項1、2又は3に記載の鋼帯。
- 元素Alが、0.30〜1.20%の量で、好ましくは0.40〜1.00%の量で存在する、請求項1〜4のいずれか一項に記載の鋼帯。
- 元素Bが、0.0011〜0.0040%の量で、好ましくは0.0015〜0.0030%の量で存在する、請求項1〜5のいずれか一項に記載の鋼帯。
- 元素Tiが、0.10%以下の量で、好ましくは0.005〜0.05%の量で存在する、請求項1〜6のいずれか一項に記載の鋼帯。
- 前記溶融亜鉛めっき鋼帯が、750MPaを超える最大引張強度Rm、及び/又は、430〜700MPaの0.2%耐力Rpを有し、好ましくは、Rp及び/又はRmに関し、前記鋼帯の中央部及び端部の差が、好ましくは75MPa未満であり、前記差が、さらに好ましくは60MPa未満である、請求項1〜7のいずれか一項に記載の鋼帯。
- 前記溶融亜鉛めっき鋼帯が、20〜50体積%のフェライトと、10〜25体積%のマルテンサイト及び残留オーステナイト(そのうち5〜12体積%が残留オーステナイトである)と、焼戻マルテンサイト、ベイナイト及びセメンタイトである残部とからなるミクロ組織を有する、請求項1〜8のいずれか一項に記載の鋼帯。
- 請求項1〜9のいずれか一項に記載の高強度溶融亜鉛めっき二相鋼帯を製造する方法であって、鋳鋼を2.0〜4.0mmの厚さに熱間圧延し、Bs−20℃未満であってMs+60℃を超える巻取温度CTで巻き取り、鋼帯を40%以上の圧下率で冷間圧延し、その後、鋼帯をAc1〜Ac3の温度で二相域焼戻し、鋼帯をBs未満の温度で過時効してベイナイト及び/又は焼戻マルテンサイトを形成し、その後、鋼帯を溶融亜鉛めっきする、方法。
- 熱間圧延された鋼帯が、50〜70体積%のフェライトと、20〜50体積%のパーライト及び/又はベイナイトと、10%未満のセメンタイトとからなるミクロ組織を有する、請求項10に記載の方法。
- 溶融亜鉛めっき鋼帯を0.2〜0.8%の圧下率で張力圧延する、請求項10又は11に記載の方法。
- 請求項1〜9のいずれか一項に記載の高強度溶融亜鉛めっき複合組織鋼帯を製造する方法であって、鋳鋼を2.0〜4.0mmの厚さに熱間圧延し、Bs−20℃未満であってMs+60℃を超える巻取温度CTで巻き取り、鋼帯を40%以上の圧下率で冷間圧延し、その後、鋼帯をAc1+50℃を超える温度で焼戻し、鋼帯をBs未満の温度で過時効してベイナイト及び/又は焼戻マルテンサイトを形成し、その後、鋼帯を溶融亜鉛めっきする、方法。
- 溶融亜鉛めっき鋼帯を0.4〜2.0%の圧下率、好ましくは0.4〜1.2%の圧下率で張力圧延する、請求項14に記載の方法。
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