JP2020509203A - 衝撃特性に優れた熱間成形用めっき鋼板、熱間成形部材、及びそれらの製造方法 - Google Patents
衝撃特性に優れた熱間成形用めっき鋼板、熱間成形部材、及びそれらの製造方法 Download PDFInfo
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- JP2020509203A JP2020509203A JP2019533548A JP2019533548A JP2020509203A JP 2020509203 A JP2020509203 A JP 2020509203A JP 2019533548 A JP2019533548 A JP 2019533548A JP 2019533548 A JP2019533548 A JP 2019533548A JP 2020509203 A JP2020509203 A JP 2020509203A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
- B32B15/012—Layered products comprising a layer of metal all layers being exclusively metallic one layer being formed of an iron alloy or steel, another layer being formed of aluminium or an aluminium alloy
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- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C21D1/673—Quenching devices for die quenching
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- Y10T428/1275—Next to Group VIII or IB metal-base component
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Abstract
Description
(上記表層部は素地鋼板の表面から200μmの深さまでの領域を意味し、上記炭素枯渇層は素地鋼板の平均C含有量(C0)の50%以下の領域を意味する。)
(上記表層部は母材表面から200μmの深さまでの領域を意味し、上記炭素濃化層は母材の平均C含有量(C0)の110%以上の領域を意味する。)
以下、本発明の一側面による衝撃特性に優れた熱間成形用めっき鋼板について詳細に説明する。
(上記表層部は素地鋼板の表面から200μmの深さまでの領域を意味し、上記炭素枯渇層は素地鋼板の平均C含有量(C0)の50%以下の領域を意味する。)
Cは熱処理部材の強度を向上させるために不可欠な元素である。
C含有量が0.15%未満の場合には、十分な強度を確保することが難しい。これに対し、C含有量が0.4%を超えると、熱延材を冷間圧延する際に熱延材の強度が高すぎるため冷間圧延性が大きく劣化するようになるだけでなく、点溶接性を大きく低下させる可能性がある。したがって、C含有量は、0.15〜0.4%であることが好ましい。
また、C含有量のより好ましい下限は0.18%であることができ、より好ましい上限は0.35%であることができる。
Siは、製鋼において脱酸剤として添加される必要があるだけでなく、固溶強化元素でありながら炭化物の生成抑制元素であって、熱間成形部材の強度上昇に寄与し、材質均一化に効果的な元素である。
Si含有量が0.05%未満の場合には上述した効果が不十分である。これに対し、Si含有量が1.0%を超えると、焼鈍中の鋼板の表面に生成されるSi酸化物によってAlのめっき性を大きく低下させる可能性がある。したがって、Si含有量は0.05〜1.0%であることが好ましい。
また、Si含有量のより好ましい下限は0.08%であることができ、より好ましい上限は0.9%であることができる。
Mnは、固溶強化効果を確保することができるだけでなく、熱間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添加される必要がある。
Mn含有量が0.6%未満の場合には上記効果を得るのに限界を有する。これに対し、Mn含有量が3.0%を超えると、熱間成形工程前の鋼板の強度上昇により、冷間圧延性が低下するだけでなく、合金鉄のコストが上昇し、点溶接性が劣化するという問題がある。したがって、Mn含有量は、0.6〜3.0%であることが好ましい。
また、Mn含有量のより好ましい下限は0.8%であることができ、より好ましい上限は2.8%であることができる。
Pは、不純物であって、P含有量を0.001%未満に制御するためには、製造コストが多くかかり、P含有量が0.05%を超えると、熱間成形部材の溶接性を大きく低下させる。したがって、P含有量は0.001〜0.05%であることが好ましい。
Sは、不純物であって、S含有量を0.0001%未満に制御するためには、製造コストが多くかかり、S含有量が0.02%を超えると、熱間成形部材の延性、衝撃特性、及び溶接性を低下させる。したがって、S含有量は、0.0001〜0.02%であることが好ましい。
Alは、Siとともに、製鋼において脱酸作用を行い、鋼の清浄度を高める役割を果たす元素である。
Al含有量が0.01%未満の場合には上述した効果が不十分であり、0.1%を超えると、連続鋳造工程中に形成される過度なAlNによる高温延性が低下し、スラブクラックが発生しやすいという問題がある。
Nは、鋼中に不純物として含まれる。N含有量を0.001%未満に制御するためには製造コストが多くかかり、N含有量が0.02%を超えると、連続鋳造工程中に形成される過多なAlNによる高温延性が低下し、スラブクラックが発生しやすいという問題がある。
Bは、少量の添加でも硬化能を向上させるだけでなく、旧オーステナイト結晶粒界に偏析し、Pまたは/及びSの粒界偏析による熱間成形部材の脆性を抑制することができる元素である。
B含有量が0.001%未満では、かかる効果を得ることが難しく、0.01%を超えると、その効果が飽和するだけでなく、熱間圧延で脆性を引き起こす可能性がある。
Crは、Mn、Bなどのように鋼の硬化能を確保するために添加される。
Cr含有量が0.01%未満の場合には、十分な硬化能を確保することが難しく、0.5%を超えると、硬化能は十分に確保することができるが、その特性が飽和するだけでなく、鋼板の製造コストが上昇する可能性がある。
Tiは、鋼に不純物として残存する窒素と結合してTiNを生成させることにより、硬化能の確保に不可欠な固溶Bを残留させるために添加される。
Ti含有量が0.01%未満の場合には、その効果を十分に期待することが難しく、0.05%を超えると、その特性が飽和するだけでなく、鋼板の製造コストが上昇する可能性がある。
上記めっき層の厚さが10μm未満の場合には、熱間成形部材の耐食性を確保することが難しく、45μmを超えると、過度なめっき付着量により製造コストが上昇するだけでなく、めっき量をコイル全幅及び長さ方向に均一にめっきすることが簡単ではない。
以下、本発明の他の一側面である衝撃特性に優れた熱間成形用めっき鋼板の製造方法について詳細に説明する。
上述した合金組成を満たすスラブを1050〜1300℃に加熱する。
上記加熱されたスラブを800〜950℃で仕上げ熱間圧延し、熱延鋼板を得る。
上記熱延鋼板を、仕上げ熱間圧延終了後30秒以内に冷却を開始し、450〜750℃で巻取りする。
上記巻取られた熱延鋼板を740〜860℃に加熱し、露点温度が−70〜−30℃である雰囲気で焼鈍する。
上記巻取られた熱延鋼板をAl−Siめっき浴に浸漬し、めっきする。冷間圧延及び焼鈍工程を行った場合には、焼鈍された冷延鋼板をAl−Siめっき浴に浸漬してめっきする。
以下、本発明のさらに他の一側面である衝撃特性に優れた熱間成形部材について詳細に説明する。
以下、本発明のさらに他の一側面である衝撃特性に優れた熱間成形部材の製造方法について詳細に説明する。
上述した本発明のめっき鋼板の製造方法によって製造されためっき鋼板をAc3〜980℃の温度範囲まで加熱し、1〜1000秒間保持する。
上記加熱されためっき鋼板をプレスで成形するとともに、1〜1000℃/secの冷却速度でMf(マルテンサイト変態終了温度)以下まで冷却する熱間成形段階を含む。
Claims (19)
- 重量%で、C:0.15〜0.4%、Si:0.05〜1.0%、Mn:0.6〜3.0%、P:0.001〜0.05%、S:0.0001〜0.02%、Al:0.01〜0.1%、N:0.001〜0.02%、B:0.001〜0.01%、Cr:0.01〜0.5%、Ti:0.01〜0.05%、残部Fe及び不可避不純物を含む素地鋼板と、
前記素地鋼板の表面に形成されたAl−Siめっき層と、を含み、
前記素地鋼板の表層部における炭素枯渇層の厚さは5μm以下である、衝撃特性に優れた熱間成形用めっき鋼板。
(前記表層部は素地鋼板の表面から200μmの深さまでの領域を意味し、前記炭素枯渇層は素地鋼板の平均C含有量(C0)の50%以下の領域を意味する。) - 前記素地鋼板は、中心部の炭化物分率(Fc)と表層部の炭化物分率(Fs)の比(Fs/Fc)が0.7〜1.3である、請求項1に記載の衝撃特性に優れた熱間成形用めっき鋼板。
(前記表層部は素地鋼板の表面から200μmの深さまでの領域を意味し、前記中心部は素地鋼板の厚さの中心から−100μm〜+100μmの領域を意味する。) - 前記素地鋼板は、Mo、Nb、及びVからなる群から選択される1種以上を、その合計が0.01〜0.5重量%となるようにさらに含む、請求項1に記載の衝撃特性に優れた熱間成形用めっき鋼板。
- 前記めっき層は、重量%で、Si:6〜12%、Fe:1〜4%、残部Al及び不可避不純物を含む、請求項1に記載の衝撃特性に優れた熱間成形用めっき鋼板。
- 前記めっき層の厚さは10〜45μmである、請求項1に記載の衝撃特性に優れた熱間成形用めっき鋼板。
- 前記素地鋼板の微細組織は、面積分率で、パーライト10〜40%、フェライト50〜90%、及びマルテンサイト20%以下を含む、請求項1に記載の衝撃特性に優れた熱間成形用めっき鋼板。
- 重量%で、C:0.15〜0.4%、Si:0.05〜1.0%、Mn:0.6〜3.0%、P:0.001〜0.05%、S:0.0001〜0.02%、Al:0.01〜0.1%、N:0.001〜0.02%、B:0.001〜0.01%、Cr:0.01〜0.5%、Ti:0.01〜0.05%、残部Fe及び不可避不純物を含むスラブを1050〜1300℃に加熱する段階と、
前記加熱されたスラブを800〜950℃で仕上げ熱間圧延し、熱延鋼板を得る段階と、
前記熱延鋼板を仕上げ熱間圧延終了後30秒以内に冷却を開始し、450〜750℃で巻取る段階と、
前記巻取られた熱延鋼板を740〜860℃に加熱し、露点温度が−70〜−30℃である雰囲気で焼鈍する段階と、
前記焼鈍された熱延鋼板をAl−Siめっき浴に浸漬し、めっきする段階と、を含む、衝撃特性に優れた熱間成形用めっき鋼板の製造方法。 - 前記焼鈍前に巻取られた熱延鋼板を冷間圧延し、冷延鋼板を得る段階をさらに含む、請求項7に記載の衝撃特性に優れた熱間成形用めっき鋼板の製造方法。
- 前記Al−Siめっき浴は、重量%で、Si:6〜12%、Fe:1〜4%、残部Al及び不可避不純物を含む、請求項7に記載の衝撃特性に優れた熱間成形用めっき鋼板の製造方法。
- 前記めっきする段階は、めっき量が片面当たりに30〜130g/m2となるように行う、請求項7に記載の衝撃特性に優れた熱間成形用めっき鋼板の製造方法。
- 重量%で、C:0.15〜0.4%、Si:0.1〜1%、Mn:0.6〜3.0%、P:0.001〜0.05%、S:0.0001〜0.02%、Al:0.01〜0.1%、N:0.001〜0.02%、B:0.001〜0.01%、Cr:0.01〜0.5%、Ti:0.01〜0.05%、残部Fe及び不可避不純物を含む母材と、
前記母材表面に形成されたAl−Siめっき層と、を含み、
前記母材の表層部に炭素濃化層が形成される、衝撃特性に優れた熱間成形部材。
(前記表層部は母材表面から200μmの深さまでの領域を意味し、前記炭素濃化層は母材の平均C含有量(C0)の110%以上の領域を意味する。) - 前記炭素濃化層の厚さは10〜150μmである、請求項11に記載の衝撃特性に優れた熱間成形部材。
- 前記母材は、Mo、Nb、及びVからなる群から選択される1種以上を、その合計が0.01〜0.5重量%となるようにさらに含む、請求項11に記載の衝撃特性に優れた熱間成形部材。
- 前記母材は、Mo、Nb、及びVからなる群から選択される1種以上を、その合計が0.01〜0.5重量%となるようにさらに含む、請求項11に記載の衝撃特性に優れた熱間成形部材。
- 前記母材の微細組織は、面積割合で、マルテンサイトまたはベイナイトを主相として90%以上含み、フェライト10%以下、及び残留オーステナイト5%以下を含む、請求項11に記載の衝撃特性に優れた熱間成形部材。
- 前記熱間成形部材は、引張強度(TS)が1300MPa以上であり、25℃で厚さ1.5mmの試験片を用いて測定した衝撃吸収エネルギー(IE)が4.0J以上である、請求項11に記載の衝撃特性に優れた熱間成形部材。
- 前記熱間成形部材は、引張強度(TS)と25℃で厚さ1.5mmの試験片を用いて測定した衝撃吸収エネルギー(IE)の積(TS×IE)が8000MPa・J以上である、請求項11に記載の衝撃特性に優れた熱間成形部材。
- 請求項7から10のいずれか一項によって製造されためっき鋼板をAc3〜980℃の温度範囲まで加熱し、1〜1000秒間保持する加熱段階と、
前記加熱されためっき鋼板をプレスで成形するとともに、1〜1000℃/secの冷却速度でMf以下まで冷却する熱間成形段階と、を含む、熱間成形部材の製造方法。 - 前記加熱は、600〜800℃の昇温速度が1〜10℃/secとなるように行う、請求項18に記載の熱間成形部材の製造方法。
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US20200087747A1 (en) | 2020-03-19 |
EP3561142B1 (en) | 2021-02-17 |
JP6931396B2 (ja) | 2021-09-01 |
US20220162720A1 (en) | 2022-05-26 |
US20230287535A1 (en) | 2023-09-14 |
KR101858868B1 (ko) | 2018-05-16 |
EP3561142A1 (en) | 2019-10-30 |
US10934601B2 (en) | 2021-03-02 |
CN110114500B (zh) | 2021-03-26 |
EP3561142A4 (en) | 2020-01-08 |
US20210140006A1 (en) | 2021-05-13 |
WO2018117543A1 (ko) | 2018-06-28 |
US11274357B2 (en) | 2022-03-15 |
CN110114500A (zh) | 2019-08-09 |
US11732323B2 (en) | 2023-08-22 |
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