JP2020509191A - 加工性に優れた溶融めっき鋼材及びその製造方法 - Google Patents
加工性に優れた溶融めっき鋼材及びその製造方法 Download PDFInfo
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- JP2020509191A JP2020509191A JP2019532942A JP2019532942A JP2020509191A JP 2020509191 A JP2020509191 A JP 2020509191A JP 2019532942 A JP2019532942 A JP 2019532942A JP 2019532942 A JP2019532942 A JP 2019532942A JP 2020509191 A JP2020509191 A JP 2020509191A
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- hot
- steel material
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- dip
- rolled steel
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 18
- 229910001335 Galvanized steel Inorganic materials 0.000 title claims description 6
- 239000008397 galvanized steel Substances 0.000 title claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 104
- 239000010959 steel Substances 0.000 claims abstract description 104
- 239000000463 material Substances 0.000 claims abstract description 81
- 239000002244 precipitate Substances 0.000 claims abstract description 25
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 21
- 239000012535 impurity Substances 0.000 claims abstract description 14
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 10
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 9
- 238000001816 cooling Methods 0.000 claims description 24
- 238000005096 rolling process Methods 0.000 claims description 19
- 238000004804 winding Methods 0.000 claims description 15
- 229910052799 carbon Inorganic materials 0.000 claims description 12
- 229910052710 silicon Inorganic materials 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 8
- 238000003303 reheating Methods 0.000 claims description 8
- 229910001566 austenite Inorganic materials 0.000 claims description 7
- 239000011247 coating layer Substances 0.000 claims description 5
- 238000003618 dip coating Methods 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- 229910001563 bainite Inorganic materials 0.000 claims description 4
- 229910052804 chromium Inorganic materials 0.000 claims description 4
- 229910052750 molybdenum Inorganic materials 0.000 claims description 4
- 229910001562 pearlite Inorganic materials 0.000 claims description 4
- 238000007747 plating Methods 0.000 claims description 4
- 239000000047 product Substances 0.000 claims description 4
- 229910052725 zinc Inorganic materials 0.000 claims description 3
- 229910052749 magnesium Inorganic materials 0.000 claims description 2
- 229910052802 copper Inorganic materials 0.000 claims 2
- 229910052759 nickel Inorganic materials 0.000 claims 2
- 238000005728 strengthening Methods 0.000 description 15
- 238000010438 heat treatment Methods 0.000 description 11
- 230000000694 effects Effects 0.000 description 8
- 230000000704 physical effect Effects 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 239000006104 solid solution Substances 0.000 description 7
- 238000001556 precipitation Methods 0.000 description 6
- 239000000203 mixture Substances 0.000 description 5
- 239000013078 crystal Substances 0.000 description 4
- 238000005098 hot rolling Methods 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 3
- 238000001887 electron backscatter diffraction Methods 0.000 description 3
- 230000001965 increasing effect Effects 0.000 description 3
- 229910052748 manganese Inorganic materials 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000009749 continuous casting Methods 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 229910018134 Al-Mg Inorganic materials 0.000 description 1
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910018467 Al—Mg Inorganic materials 0.000 description 1
- 241000219307 Atriplex rosea Species 0.000 description 1
- 238000012935 Averaging Methods 0.000 description 1
- 229910007570 Zn-Al Inorganic materials 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
Description
Cは、強度を確保するのに最も経済的であり、且つ効果的な元素である。もし、炭素含量が低すぎると、Nbなどの析出強化元素を添加しても目標とする強度を確保し難い。一方、その含量が高すぎると、強度の過剰な上昇によって延性が劣化する恐れがある。
Siは、溶鋼の脱酸及び固溶強化による強度上昇に寄与するが、本発明では意図的に添加せず、シリコンを添加しなくても物性の確保に大きな支障はない。一方、その含量が高すぎると、熱延鋼材の表面にSiによる赤スケールが形成されて表面品質が低下し、溶接性が低下する可能性がある。
Mnは、鋼を固溶強化させるのに効果的な元素であり、適正強度を確保するためには、0.5%以上添加される必要がある。但し、その含量が高すぎると、連続鋳造工程で中心偏析部が発生する危険がある。
Nbは、析出強化型元素であって、NbC系の析出物を生成させることで延性の低下を最小限に抑えながらも強度を確保するのに効果的な元素である。特に、適正量のNbを添加すると、降伏強度を強化する効果が大きい。本発明では、かかる効果を得るために、Nbを0.01%以上添加することが好ましい。但し、その含量が高すぎると、製造コストが上昇して経済性が低下する可能性がある。したがって、これを考慮して、Nb含量の上限を0.05%に限定することが好ましい。
Vも析出強化型元素であって、鋼の強度を確保するのに効果的な元素である。本発明では、かかる効果を得るために、Vを0.005%以上添加することが好ましい。但し、その含量が高すぎると、靭性が低下する可能性がある。したがって、これを考慮して、V含量の上限を0.05%に限定することが好ましい。
Pは、鋼中に不可避に含まれる不純物であって、できるだけその含量を低く管理することが好ましい。特に、その含量が高すぎると、溶接性の劣化及び鋼の脆性が発生する危険が大きくなるため、本発明では、その含量を0.03%以下に管理する。
Sは、鋼中に不可避に含まれる不純物であって、できるだけその含量を低く管理することが好ましい。特に、その含量が高すぎると、Mnなどと結合して非金属介在物を形成し、鋼の脆性が発生する危険が大きくなるため、本発明では、その含量を0.015%以下に管理する。
Alは、溶鋼の脱酸に寄与するが、本発明では意図的に添加せず、アルミニウムを添加しなくても物性の確保に大きな支障はない。一方、その含量が高すぎると、連続鋳造においてノズルの目詰まりなどが発生する可能性があるため、本発明では、その含量を0.05%以下に管理する。
Nは、鋼の強度向上に寄与するが、本発明では意図的に添加せず、アルミニウムを添加しなくても物性の確保に大きな支障はない。一方、その含量が高すぎると、鋼の脆性が発生する危険が大きくなるため、本発明では、その含量を0.01%以下に管理する。
Crは、鋼を固溶強化させ、且つ冷却においてベイナイト相変態を遅延させて等軸フェライトの形成に寄与するが、本発明ではCrを添加しなくても物性の確保に大きな支障はない。一方、その含量が高すぎると、溶接性が劣化するため、本発明では、その含量を0.05%以下に制御する。
Niは、鋼の強度と靭性をともに向上させる役割を果たすが、本発明ではNiを添加しなくても物性の確保に大きな支障はない。一方、その含量が高すぎると、経済性が低下するだけではなく、溶接性が劣化するため、本発明では、その含量を0.05%以下に制御する。
Moは、固溶強化によって降伏強度を向上させ、結晶粒界強化によって衝撃靭性を改善する役割を果たすが、本発明ではMoを添加しなくても物性の確保に大きな支障はない。一方、その含量が高すぎると、経済性が低下するだけではなく、溶接性が劣化するため、本発明では、その含量を0.01%以下に制御する。
Cuは、微細析出物を形成して強度を上昇させる役割を果たすが、本発明ではCuを添加しなくても物性の確保に大きな支障はない。一方、その含量が高すぎると、熱間加工性及び常温加工性が劣化するため、本発明では、その含量を0.01%以下に制御する。
[式1]Ceq=[C]+[Mn]/6+([Cu]+[Ni])/15+([Cr]+[Mo]+[V])/5
(ここで、[C]、[Mn]、[Cu]、[Ni]、[Cr]、[Mo]及び[V]はそれぞれ、該当元素の含量(重量%)を意味する)
Sは、鋼中に不可避に含まれる不純物であって、できるだけその含量を低く管理することが好ましい。特に、その含量が高すぎると、Mnなどと結合して非金属介在物を形成し、鋼の脆性が発生する危険が大きくなるため、本発明では、その含量を0.015%以下に管理する。
Nは、鋼の強度向上に寄与するが、本発明では意図的に添加せず、窒素を添加しなくても物性の確保に大きな支障はない。一方、その含量が高すぎると、鋼の脆性が発生する危険が大きくなるため、本発明では、その含量を0.01%以下に管理する。
Claims (14)
- 熱延鋼材及び前記熱延鋼材の表面に形成された溶融めっき層を含み、前記熱延鋼材は、重量%で、C:0.05〜0.15%、Si:0.5%以下(0%は除く)、Mn:0.5〜1.5%、Nb:0.01〜0.05%、V:0.005〜0.05%、P:0.03%以下(0%は除く)、S:0.015%(0%は除く)、Al:0.05%以下(0%は除く)、N:0.01%以下(0%は除く)、残部Fe及び不可避不純物を含み、微細組織として、90面積%以上のフェライトを含み、5,000〜15,000個/μm2のV系析出物を含む、溶融めっき鋼材。
- 前記V系析出物の平均直径は5〜10nmである、請求項1に記載の溶融めっき鋼材。
- 前記V系析出物の最大直径は20nm以下である、請求項1に記載の溶融めっき鋼材。
- 前記フェライトのアスペクト比(aspect ratio)は0.8〜1.4である、請求項1に記載の溶融めっき鋼材。
- 前記フェライト以外の残部は、パーライト及びベイナイトからなる群から選択される1種以上である、請求項1に記載の溶融めっき鋼材。
- 前記不可避不純物はCr、Ni、Mo及びCuを含み、重量%で、Cr:0.05%以下、Ni:0.05%以下、Mo:0.01%以下、Cu:0.01%以下に抑制される、請求項1に記載の溶融めっき鋼材。
- 前記熱延鋼材は、下記式1で定義される炭素当量(Ceq)が0.43以下である、請求項6に記載の溶融めっき鋼材。
[式1]Ceq=[C]+[Mn]/6+([Cu]+[Ni])/15+([Cr]+[Mo]+[V])/5
(ここで、[C]、[Mn]、[Cu]、[Ni]、[Cr]、[Mo]及び[V]はそれぞれ、該当元素の含量(重量%)を意味する) - 前記溶融めっき層は、Zn、Al及びMgからなる群から選択される1種以上を含む、請求項1に記載の溶融めっき鋼材。
- 降伏強度と伸びの積は12,000〜15,000MPa・%である、請求項1に記載の溶融めっき鋼材。
- 重量%で、C:0.05〜0.15%、Si:0.5%以下(0%は除く)、Mn:0.5〜1.5%、Nb:0.01〜0.05%、V:0.005〜0.05%、P:0.03%以下(0 %は除く)、S:0.015%(0%は除く)、Al:0.05%以下(0%は除く)、N:0.01%以下(0%は除く)、残部Fe及び不可避不純物を含むスラブを1100〜1300℃の温度で再加熱する段階と、
前記再加熱されたスラブを粗圧延した後、オーステナイト単相域温度で仕上げ圧延して熱延鋼材を得る段階と、
前記熱延鋼材を40〜60℃/secの速度で650〜750℃の温度まで水冷した後、1〜5秒間空冷する段階と、
前記空冷された熱延鋼材を550〜650℃の温度で巻き取る段階と、
前記巻き取られた熱延鋼材を500〜650℃の温度で1〜5分間熱処理した後、溶融めっきする段階と、
を含む、溶融めっき鋼材の製造方法。 - 前記スラブの再加熱時間は100〜400分である、請求項10に記載の溶融めっき鋼材の製造方法。
- 前記再加熱されたスラブの厚さに対する粗圧延されたスラブの厚さは、10〜25%である、請求項10に記載の溶融めっき鋼材の製造方法。
- 前記仕上げ圧延温度は800〜900℃である、請求項10に記載の溶融めっき鋼材の製造方法。
- 前記空冷された熱延鋼材の温度が650℃を超える場合、前記空冷された熱延鋼材を巻き取る前に、前記空冷された熱延鋼材を550〜650℃の温度まで40〜60℃/secの速度で水冷する段階をさらに含む、請求項10に記載の溶融めっき鋼材の製造方法。
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