JP2024010039A - 熱間成形部材及びその製造方法 - Google Patents
熱間成形部材及びその製造方法 Download PDFInfo
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- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
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Abstract
Description
先ず、本発明の一側面による熱間成形部材は、素地鋼板と、上記素地鋼板上に形成されたアルミニウム合金めっき層と、を含み、上記アルミニウム合金めっき層は、上記素地鋼板上に形成され、重量%でAl:5~30%を含む合金化層(I)と、上記合金化層(I)上に形成され、重量%でAl:30~60%を含む合金化層(II)と、上記合金化層(II)上に形成され、重量%でAl:20~50%及びSi:5~20%を含む合金化層(III)と、上記合金化層(III)の表面の少なくとも一部に連続的または不連続的に形成され、Al:30~60%を含む合金化層(IV)と、を含む。
上記Cは、熱処理部材の強度を向上させるための必須元素であり、適正量で添加されることができる。すなわち、熱処理部材の強度を十分に確保するために、上記Cは0.04%以上添加されることができる。好ましくは、上記Cの含量の下限は0.1%以上であることができる。しかし、その含量が高すぎる場合には、冷延材の生産時に熱延材の冷間圧延を行う際に、熱延材の強度が過度に高くて冷間圧延性が大きく劣るだけでなく、スポット溶接性を大きく低下させるため、十分な冷間圧延性とスポット溶接性を確保するために、0.5%以下添加されることができる。また、上記Cの含量は0.45%以下、より好ましくは0.4%以下にその含量を制限してもよい。
上記Siは、製鋼において脱酸剤として添加される必要があり、熱間プレス成形部材の強度に最も大きい影響を与える炭化物の生成を抑える役割を果たす。本発明では、熱間プレス成形において、マルテンサイトの生成後にマルテンサイトのラス(lath)粒界に炭素を濃化させることで残留オーステナイトを確保するために、0.01%以上の含量で添加されることができる。また、圧延後の鋼板にアルミニウムめっきを行う時に十分なめっき性を確保するために、上記Siの含量の上限を2%に決定することができる。好ましくは、上記Siの含量を1.5%以下に制限してもよい。
上記Mnは、固溶強化の効果を確保することができるだけでなく、熱間プレス成形部材においてマルテンサイトを確保するための臨界冷却速度を下げるために、0.1%以上の含量で添加されることができる。また、鋼板の強度を適切に維持することで、熱間プレス成形工程の作業性を確保し、製造原価を低減し、スポット溶接性を向上させるという点から、上記Mnの含量は5%以下に制限することができる。
上記Pは、鋼中に不純物として存在し、できる限りその含量が少ないほど有利である。したがって、本発明において、Pの含量を0.05%以下に制限することができ、好ましくは、0.03%以下に制限してもよい。Pは、少ないほど有利な不純物元素であるため、その含量の上限を特に決定する必要はない。しかし、Pの含量を過度に減少させると製造コストが上昇する恐れがあるため、これを考慮すると、その下限を0.001%にすることができる。
上記Sは、鋼中に不純物として存在し、部材の延性、衝撃特性、及び溶接性を阻害する元素であるため、最大含量を0.02%に制限し、好ましくは0.01%以下に制限することができる。また、その最小含量が0.0001%未満である場合には製造コストが上昇する恐れがあるため、その含量の下限を0.0001%にすることができる。
上記Alは、Siとともに製鋼で脱酸作用を行って鋼の清浄度を高めることができ、上記効果を得るために、0.001%以上の含量が添加されることができる。また、Ac3温度が過度に高くならないようにし、熱間プレス成形時に必要な加熱を適切な温度範囲で行うことができるように、上記Alの含量は1%以下に制限することができる。
上記Nは、鋼中に不純物として含まれる元素であり、スラブの連鋳時にクラックの発生に対する敏感度を減少させ、衝撃特性を確保するためには、その含量が低いほど有利であるため、0.02%以下含まれることができる。下限を特に決定する必要はないが、製造コストの上昇などを考慮すると、Nの含量を0.001%以上に決定してもよい。
上記Bは、少量添加しても硬化能を向上させることができるだけでなく、旧オーステナイト結晶粒界に偏析され、P及び/またはSの粒界偏析による熱間プレス成形部材の脆性を抑えることができる元素である。したがって、Bは0.0001%以上添加されることができる。しかし、0.01%を超える場合には、その効果が飽和するだけでなく、熱間圧延で脆性をもたらすため、その上限を0.01%にし、好ましくは上記Bの含量を0.005%以下にすることができる。
上記Crは、Mnと同様に、固溶強化の効果、及び熱間成形時の硬化能の向上のために添加する元素であり、上記効果を得るために0.01%以上添加されることができる。但し、部材の溶接性を確保するために、その含量を1%以下に制限することができる。また、1%を超える場合には、添加量に比べて硬化能の向上効果も微小であるため、原価の点からも不利である。
上記Tiは、微細析出物の形成による熱処理部材の強度上昇、及び結晶粒の微細化による部材の衝突性能向上に効果があるだけでなく、Bが添加される場合には、Nと先に反応してBの添加効果を極大化させる効果がある。上記効果を得るために、Tiは0.001%以上添加されることができる。しかし、Tiの含量の増加に起因する粗大なTiNの形成は部材の衝突性能を劣化させるため、その含量を0.2%以下に制限することができる。
本発明の熱間成形部材は、熱間圧延または冷間圧延された素地鋼板を準備し、上記素地鋼板の表面にアルミニウムめっきを行い、箱焼鈍炉で合金化熱処理してアルミニウム合金めっき鋼板を得た後、所定の条件で熱間プレス成形することで得ることができる。
本開示は以下の実施形態を含む。
実施形態1
素地鋼板と、前記素地鋼板上に形成されたアルミニウム合金めっき層と、を含む熱間成形部材であって、
前記アルミニウム合金めっき層は、
前記素地鋼板上に形成され、重量%でAl:5~30%を含む合金化層(I)と、
前記合金化層(I)上に形成され、重量%でAl:30~60%を含む合金化層(II)と、
前記合金化層(II)上に形成され、重量%でAl:20~50%及びSi:5~20%を含む合金化層(III)と、
前記合金化層(III)の表面の少なくとも一部に連続的または不連続的に形成され、Al:30~60%を含む合金化層(IV)と、を含み、
前記アルミニウム合金めっき層の最表面に露出した合金化層(III)の比率が10%以上である、熱間成形部材。
実施形態2
前記合金化層(III)に複数の空隙(pore)が形成されており、
前記合金化層(III)の空隙率が5~50%であることを特徴とする、実施形態1に記載の熱間成形部材。
実施形態3
前記素地鋼板は、重量%で、C:0.04~0.5%、Si:0.01~2%、Mn:0.1~5%、P:0.001~0.05%、S:0.0001~0.02%、Al:0.001~1%、N:0.001~0.02%、残部Fe、及びその他の不純物を含むことを特徴とする、実施形態1に記載の熱間成形部材。
実施形態4
前記素地鋼板は、重量%で、B:0.001~0.01%、Cr:0.01~1%、Ti:0.001~0.2%のうち1種以上をさらに含むことを特徴とする、実施形態3に記載の熱間成形部材。
実施形態5
素地鋼板の表面をアルミニウムめっきし、巻き取ってアルミニウムめっき鋼板を得る段階と、
アルミニウムめっき鋼板を焼鈍してアルミニウム-鉄合金めっき鋼板を得る段階と、
前記アルミニウム-鉄合金めっき鋼板を熱間プレス成形する段階と、を含む熱間成形部材の製造方法であって、
前記アルミニウムめっき量は、鋼板の片面を基準として30~200g/m2であり、
アルミニウムめっき後の250℃までの冷却速度を20℃/秒以下とし、
巻き取り時における巻取張力を0.5~5kg/mm2とし、
前記焼鈍は、箱焼鈍炉で、550~750℃の加熱温度範囲で30分~50時間行い、
前記焼鈍時に常温から前記加熱温度まで加熱する時に、平均昇温速度を10~100℃/hとし、かつ400~500℃の区間の平均昇温速度を1~15℃/hとし、
前記箱焼鈍炉内の雰囲気温度と鋼板温度との差を5~80℃とし、
熱間プレス成形時に、Ac3~950℃の温度範囲で熱処理し、この際、200℃からAc3~950℃の温度範囲まで3~18℃/sの昇温速度で加熱し、総加熱時間を1~15分間として熱処理した後に熱間プレス成形する、熱間成形部材の製造方法。
実施形態6
前記熱間成形部材の製造方法により熱間成形部材を500回生産した時に、熱間成形金型の10点平均摩耗深さが15μm以下であることを特徴とする、実施形態5に記載の熱間成形部材の製造方法。
Claims (13)
- 素地鋼板と、前記素地鋼板上に形成されたアルミニウム合金めっき層と、を含む熱間成形部材であって、
前記アルミニウム合金めっき層は、
前記素地鋼板上に形成され、重量%で、Al:5~30%、Si:0~10%、残部Fe、及びその他の合金化による不可避不純物を含む合金化層(I)と、
前記合金化層(I)上に形成され、重量%で、Al:30~60%、Si:0~5%、残部Fe、及びその他の合金化による不可避不純物を含む合金化層(II)と、
前記合金化層(II)上に形成され、重量%で、Al:20~50%、Si:5~20%、残部Fe、及びその他の合金化による不可避不純物を含む合金化層(III)と、
前記合金化層(III)の表面の少なくとも一部に形成され、重量%で、Al:30~60%、Si:0~5%、残部Fe、及びその他の合金化による不可避不純物を含む合金化層(IV)と、を含み、
前記アルミニウム合金めっき層の最表面に露出した合金化層(III)の比率が10%以上である、熱間成形部材。 - 前記アルミニウム合金めっき層の最表面に露出した合金化層(III)の比率が15%以上である、請求項1に記載の熱間成形部材。
- 前記アルミニウム合金めっき層の最表面に露出した合金化層(III)の比率が20%以上である、請求項2に記載の熱間成形部材。
- 前記合金化層(III)に複数の空孔(pore)が形成される、請求項1に記載の熱間成形部材。
- 前記合金化層(III)の空孔率が5~50%である、請求項1に記載の熱間成形部材。
- 前記合金化層(III)の空孔率が7~50%である、請求項5に記載の熱間成形部材。
- 前記素地鋼板は、重量%で、C:0.04~0.5%、Si:0.01~2%、Mn:0.1~5%、P:0.001~0.05%、S:0.0001~0.02%、Al:0.001~1%、N:0.001~0.02%、残部Fe、及びその他の不純物を含む、請求項1に記載の熱間成形部材。
- 前記素地鋼板は、重量%で、B:0.001~0.01%、Cr:0.01~1%、Ti:0.001~0.2%のうち1種以上をさらに含む、請求項7に記載の熱間成形部材。
- 前記アルミニウム合金めっき層の表面に酸化物層が形成される、請求項1に記載の熱間成形部材。
- 前記合金化層(I)の硬度は、前記合金化層(II)の硬度より低い、請求項1に記載の熱間成形部材。
- 前記合金化層(I)の硬度は、300~700Hvである、請求項1に記載の熱間成形部材。
- 前記合金化層(III)の硬度は、前記合金化層(II)の硬度より低い、請求項1に記載の熱間成形部材。
- 前記合金化層(III)の硬度は、300~700Hvである、請求項1に記載の熱間成形部材。
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| Publication number | Publication date |
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| CN113166910A (zh) | 2021-07-23 |
| EP4234732A2 (en) | 2023-08-30 |
| US11578397B2 (en) | 2023-02-14 |
| PL3889311T3 (pl) | 2024-03-04 |
| EP3889311A1 (en) | 2021-10-06 |
| KR20200066087A (ko) | 2020-06-09 |
| EP3889311B1 (en) | 2023-11-01 |
| JP2022513651A (ja) | 2022-02-09 |
| MX2021005583A (es) | 2021-06-30 |
| EP3889311A4 (en) | 2022-01-26 |
| US11998971B2 (en) | 2024-06-04 |
| KR102227111B1 (ko) | 2021-03-12 |
| US20240261843A1 (en) | 2024-08-08 |
| US20230167531A1 (en) | 2023-06-01 |
| US20210395872A1 (en) | 2021-12-23 |
| DE202019006086U1 (de) | 2024-09-17 |
| WO2020111648A1 (ko) | 2020-06-04 |
| CN113166910B (zh) | 2023-08-15 |
| JP7402232B2 (ja) | 2023-12-20 |
| US20230227956A1 (en) | 2023-07-20 |
| ES2970241T3 (es) | 2024-05-27 |
| CN116926544A (zh) | 2023-10-24 |
| US11897014B2 (en) | 2024-02-13 |
| DE202019006175U1 (de) | 2025-11-04 |
| EP4234732A3 (en) | 2023-09-06 |
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