JP6719486B2 - 耐剥離性に優れたhpf成形部材及びその製造方法 - Google Patents
耐剥離性に優れたhpf成形部材及びその製造方法 Download PDFInfo
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- 238000000034 method Methods 0.000 title claims description 25
- 238000004519 manufacturing process Methods 0.000 title claims description 23
- 229910000831 Steel Inorganic materials 0.000 claims description 85
- 239000010959 steel Substances 0.000 claims description 85
- 238000007747 plating Methods 0.000 claims description 57
- 238000009792 diffusion process Methods 0.000 claims description 52
- 229910052782 aluminium Inorganic materials 0.000 claims description 43
- 238000010438 heat treatment Methods 0.000 claims description 43
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 33
- 238000000465 moulding Methods 0.000 claims description 14
- 239000012535 impurity Substances 0.000 claims description 13
- 229910052710 silicon Inorganic materials 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 12
- 229910000859 α-Fe Inorganic materials 0.000 claims description 12
- 229910052804 chromium Inorganic materials 0.000 claims description 11
- 229910052748 manganese Inorganic materials 0.000 claims description 11
- 229910052719 titanium Inorganic materials 0.000 claims description 10
- 229910052742 iron Inorganic materials 0.000 claims description 8
- 229910052796 boron Inorganic materials 0.000 claims description 7
- 229910052750 molybdenum Inorganic materials 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 229910052698 phosphorus Inorganic materials 0.000 claims description 4
- 229910000680 Aluminized steel Inorganic materials 0.000 claims description 3
- 239000010410 layer Substances 0.000 description 106
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 23
- 239000002585 base Substances 0.000 description 14
- 229910045601 alloy Inorganic materials 0.000 description 11
- 239000000956 alloy Substances 0.000 description 11
- 239000000463 material Substances 0.000 description 10
- 230000000694 effects Effects 0.000 description 9
- 229920006395 saturated elastomer Polymers 0.000 description 7
- 229910015372 FeAl Inorganic materials 0.000 description 6
- 239000006104 solid solution Substances 0.000 description 6
- 239000010960 cold rolled steel Substances 0.000 description 5
- 238000011156 evaluation Methods 0.000 description 5
- 239000000047 product Substances 0.000 description 5
- 229910052718 tin Inorganic materials 0.000 description 5
- 230000009466 transformation Effects 0.000 description 5
- 238000000137 annealing Methods 0.000 description 4
- 229910052787 antimony Inorganic materials 0.000 description 4
- 238000005452 bending Methods 0.000 description 4
- 229910052797 bismuth Inorganic materials 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 238000007598 dipping method Methods 0.000 description 4
- 229910052758 niobium Inorganic materials 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000010791 quenching Methods 0.000 description 4
- 229910052726 zirconium Inorganic materials 0.000 description 4
- 229910000905 alloy phase Inorganic materials 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 3
- 229910000765 intermetallic Inorganic materials 0.000 description 3
- 230000000171 quenching effect Effects 0.000 description 3
- 229910052720 vanadium Inorganic materials 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000000265 homogenisation Methods 0.000 description 2
- 238000007731 hot pressing Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 229910000734 martensite Inorganic materials 0.000 description 2
- 238000013001 point bending Methods 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
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- 238000005482 strain hardening Methods 0.000 description 2
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- 238000012546 transfer Methods 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- 229910001335 Galvanized steel Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910001563 bainite Inorganic materials 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
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- 238000005098 hot rolling Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Description
に加熱して強度を下げた後、鋼板に比べて低温(例えば、室温)の金型で成形することで、形状の付与とともに、両者の温度差を用いた急冷熱処理(焼入れ)を行って、成形後の強度を確保するという熱間プレス成形法が部品の製造に採用されている。尚、このような熱間プレス成形法は、ホットプレス法の他、ホットフォーミング法、ホットスタンピング法、ホットスタンプ法、ダイクエンチ法等、様々な名称で呼ばれている。
上記Cは、マルテンサイトの強度を増加させる必須の元素である。Cの含有量が0.18%未満であると、耐衝突特性を確保するための十分な強度を得ることが難しい。また、0.25%を超えて含有すると、スラブの衝撃靭性を低下させるだけでなく、HPF成形部材の溶接性が低下することがある。これを考慮して、本発明では、上記Cの含有量を0.18〜0.25重量%(以下、単に%という。)に制限することが好ましい。
上記Siは、鋼の加工硬化能を高め、HPF後の鋼材の材質均一化に効果的である。Siの含有量が0.1%未満であると、加工硬化能及び材質均一化、及びめっき層への拡散に十分な効果が得られず、0.5%を超えると、添加による効果を期待できず、コストの上昇をもたらすことがある。これを考慮して、本発明では、Siの含有量を0.1〜0.5%の範囲に制限することが好ましい。
上記Mnは、Cr、B等と同様に、鋼の硬化能を確保するために添加される。Mnの含有量が0.9%未満であると、十分な硬化能を確保し難くベイナイトが生成されることがあるため、十分な強度を確保することが困難である。また、その含有量が1.5%を超えると、鋼板の製造コストが上昇するだけでなく、鋼材の内部にMnが偏析され、HPF成形部材の曲げ特性を著しく低下させることがある。これを考慮して、本発明では、Mnの含有量を0.9〜1.5%の範囲に制限することが好ましい。
上記Pは、粒界偏析元素で、HPF成形部材の多くの特性を阻害させる元素であるため、できるだけ少量添加されることが好ましい。Pの含有量が0.03%を超えると、成形部材の曲げ特性、衝撃特性、及び溶接性等が劣化するため、その上限を0.03%に制限することが好ましい。
上記Sは、鋼中に不純物として存在し、成形部材の曲げ特性及び溶接性を阻害する元素であるため、できるだけ少量添加されることが好ましい。Sの含有量が0.01%を超えると、成形部材の曲げ特性及び溶接性等が悪くなるため、その上限を0.01%に制限することが好ましい。
上記Alは、Siと同様に、製鋼において脱酸作用を目的に添加される。この目的を達成するために、Alは0.01%以上が添加される必要があり、その含有量が0.05%を超えると、その効果は飽和するだけでなく、めっき材の表面品質を悪くするため、その上限を0.05%に制限することが好ましい。
上記Crは、Mn、B等と同様に、鋼の硬化能を確保するために添加される。上記Crの含有量が0.05%未満であると、十分な硬化能を確保することが困難であり、その含有量が0.5%を超えると、硬化能は十分に確保可能であるが、その特性が飽和するだけでなく、鋼材の製造コストが上昇しかねない。これを考慮して、本発明では、上記Crの含有量を0.05〜0.5%の範囲に制限することが好ましい。
上記Tiは、鋼中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、硬化能の確保に必須の固溶Bを残留させるために添加される。上記Tiの含有量が0.01%未満であると、その効果を十分に期待することが困難であり、その含有量が0.05%を超えると、その特性が飽和する可能性があるだけでなく、鋼材の製造コストが上昇しかねない。これを考慮して、本発明では、上記Tiの含有量を0.01〜0.05%の範囲に制限することが好ましい。
上記Bは、MnとCrと同様に、HPF成形部材において硬化能を確保するために添加される。上記目的を達成するために、Bは0.001%以上添加される必要があり、その含有量が0.005%を超えると、その効果は飽和するだけでなく、熱間圧延性を著しく低下させる。したがって、本発明では、上記Bの含有量を0.001〜0.005%の範囲に制限することが好ましい。
上記Nは、鋼中に不純物として存在し、できるだけ少量添加されることが好ましい。Nの含有量が0.009%を超えると、鋼材の表面不良を引き起こしかねないため、その上限を0.009%に制限することが好ましい。
上記MoとWは、硬化能及び析出強化元素で、高強度をさらに確保するという効果が大きい。MoとWの添加量の合計が0.001%未満であると、十分な硬化能及び析出強化の効果を得ることができず、0.5%を超えると、その効果が飽和するだけでなく、製造コストが上昇しかねない。したがって、本発明では、上記Mo+Wの含有量を0.001〜0.5%の範囲に制限することが好ましい。
上記Nb、Zr及びVは、鋼板の強度上昇、結晶粒微細化、及び熱処理特性を向上させる元素である。上記Nb、Zr及びVのうち1種以上の含有量が0.001%未満であると、上記のような効果を期待することが困難であり、その含有量が0.4%を超えると、製造コストが上昇しすぎるようになる。したがって、本発明では、これらの元素の含有量を0.001〜0.4%に制限することが好ましい。
上記Cuは、微細なCu析出物を生成して強度を向上させる元素であり、上記Niは、強度上昇及び熱処理性を向上させるのに有効な元素である。若し、これらの成分の合計が0.005%未満であると、所望する強度を十分に得ることができず、2.0%を超えると、操業性を低下させ、製造コストを上昇させかねない。これを考慮して、本発明では、Cu+Ni:0.005〜2.0%で制御することが好ましい。
上記Sb、Sn及びBiは、粒界偏析元素で、HPF加熱時にめっき層と素地鉄の界面に濃化し、めっき層の密着性を向上させることができる。めっき層の密着力を向上させることにより、熱間成形時のめっき層の脱落防止に一助することができる。Sb、Sn及びBiは、類似した特性を有するため、3つの元素を混合して用いることも可能であり、このとき、1種以上の合計を0.03%以下にすることが好ましい。成分の合計が0.03%を超えると、熱間成形時に素地鉄の脆性が悪化する恐れがあるためである。
上記鋼板は熱延鋼板であっても、冷延鋼板であってもよい。
○:剥離がなく、テープに剥離片が付着していない。
▲:剥離が一部発生し、テープに僅かに付着している。
×:剥離が発生し、テープに付着している。
Claims (5)
- 重量%で、C:0.18〜0.25%、Si:0.1〜0.5%、Mn:0.9〜1.5%、P:0.03%以下、S:0.01%以下、Al:0.01〜0.05%、Cr:0.05〜0.5%、Ti:0.01〜0.05%、B:0.001〜0.005%、N:0.009%以下、残部Fe及びその他の不純物を含む鋼板を設ける工程と、
前記鋼板を550〜850℃の温度に加熱した後、640〜680℃に維持し、その組成成分が、重量%で、Si:1〜11%、Fe:3%未満、残部Al及びその他の不可避不純物を含んで組成される溶融アルミニウムめっき浴に浸漬して溶融アルミニウムめっき処理を行う工程と、
前記溶融アルミニウムめっき鋼板を900〜990℃の温度に加熱した後、10〜30分間維持することで、その表面の溶融アルミニウムめっき層をAl固溶されたα−Feからなる単一の軟質拡散層として製造する工程と、
前記単一の軟質拡散層を有する溶融アルミニウムめっき鋼板を熱間成形するとともに、300℃以下の温度範囲まで急冷することによりHPF成形品を製造する工程
とを含み、
前記拡散層は、自体重量%で、Si、Mn、Alのうち1種又は2種以上を1.0〜5.0%の量で含むことを特徴とする、HPF成形部材の製造方法。 - 前記単一の軟質拡散層は、その硬度が300〜600(Hv)であることを特徴とする、請求項1に記載のHPF成形部材の製造方法。
- 前記拡散層は、その厚さが2〜40μmの範囲にあることを特徴とする、請求項2に記載のHPF成形部材の製造方法。
- 前記拡散層は、その厚さが2〜10μmの範囲にあることを特徴とする、請求項3に記載のHPF成形部材の製造方法。
- 前記拡散層は、自体重量%で、Cr、Mo、Tiのうち1種又は2種以上を0.2〜1.0%の量で含むことを特徴とする、請求項2に記載のHPF成形部材の製造方法。
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