JP7479407B2 - 板厚方向で強度と硬度が異なる冷延帯鋼及びその製造方法 - Google Patents
板厚方向で強度と硬度が異なる冷延帯鋼及びその製造方法 Download PDFInfo
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- 239000010960 cold rolled steel Substances 0.000 title claims description 77
- 238000004519 manufacturing process Methods 0.000 title claims description 33
- 238000001816 cooling Methods 0.000 claims description 131
- 229910000831 Steel Inorganic materials 0.000 claims description 116
- 239000010959 steel Substances 0.000 claims description 116
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- 229910052729 chemical element Inorganic materials 0.000 claims description 14
- 238000000137 annealing Methods 0.000 claims description 13
- 239000012535 impurity Substances 0.000 claims description 8
- 229910052748 manganese Inorganic materials 0.000 claims description 8
- 229910052796 boron Inorganic materials 0.000 claims description 6
- 229910052804 chromium Inorganic materials 0.000 claims description 6
- 229910052719 titanium Inorganic materials 0.000 claims description 6
- 229910052750 molybdenum Inorganic materials 0.000 claims description 5
- 229910052758 niobium Inorganic materials 0.000 claims description 5
- 229910052721 tungsten Inorganic materials 0.000 claims description 5
- 238000005098 hot rolling Methods 0.000 claims description 4
- 229910052720 vanadium Inorganic materials 0.000 claims description 4
- 238000003723 Smelting Methods 0.000 claims description 3
- 238000005097 cold rolling Methods 0.000 claims description 3
- 238000009749 continuous casting Methods 0.000 claims description 3
- 229910000734 martensite Inorganic materials 0.000 description 16
- 229910001563 bainite Inorganic materials 0.000 description 10
- 229910000859 α-Fe Inorganic materials 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 239000007789 gas Substances 0.000 description 6
- 238000005299 abrasion Methods 0.000 description 5
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- 229910052757 nitrogen Inorganic materials 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
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- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- 229910052717 sulfur Inorganic materials 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- 229910001566 austenite Inorganic materials 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 229910052698 phosphorus Inorganic materials 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910000760 Hardened steel Inorganic materials 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000011160 research Methods 0.000 description 2
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- 239000013585 weight reducing agent Substances 0.000 description 1
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Description
帯鋼の両表面の冷却開始温度は非対称である;
帯鋼の両表面の冷却終了温度は非対称である;
帯鋼の両表面の冷却速度は非対称である。
C:マルテンサイトの硬度に影響を与えることで強度を向上させる。炭素含有量が少なすぎると、マルテンサイトは焼入硬化できず、若しくは焼入後の強度自体が低くなり、靭性と可塑性の矛盾が顕著にならないが、炭素含有量が多すぎると、マルテンサイトが硬くなり、靭性が低すぎ、且つ遅れ破壊が発生する傾向にあるということに基づいて、板厚方向で硬度が可変だという優れた効果を得るために、本発明にかかる板厚方向で強度と硬度が可変な冷延帯鋼のCの質量百分率を、0.06~0.3wt%に制御することができる。ある好ましい実施形態において、Cの質量百分率を0.09~0.2%に制御する。
本発明にかかる製造方法は、板厚方向で非対称な冷却技術により、変態強化型鋼において板厚方向で非対称な帯鋼強度(硬度)分布を得ることができ、一方の面では強度・硬度が高いが、他方の面では可塑性・靭性が良好であるという利点を有する。また、帯鋼の両表面の特性に差異があるため、板厚方向に沿って硬度又は強度が段階的に変化するようになり、これで、得られる板厚方向で強度と硬度が可変な冷延帯鋼は、片面が高硬度で、耐摩擦や耐圧痕の特性に優れるが、全体として靭性が良好だと要求する用途に好適である。
上記の実施例1~6にかかる板厚方向で強度と硬度が可変な冷延帯鋼は、以下の工程を経って製造された:
(1)表1に示す化学組成に従って製錬と鋳造を行った;
(2)連続鋳造;
(3)熱間圧延:スラブ加熱温度を1170~1230℃にし、圧延終了温度を850~910℃にし、巻取り温度を570~630℃にすることができ、その後で酸洗して表面の酸化スケールを除去することができた。
Claims (17)
- その化学元素の質量百分率配合は:C 0.06~0.3wt%、Si 0.01~2.5wt%、Mn 0.5~3wt%、Al 0.02~0.08wt%、残部がFeとその他の不可避不純物であり;且つ降伏強度≧420MPa、引張強度≧800MPa、伸び≧11%、両面の硬度差が少なくとも30HVである板厚方向で強度と硬度が異なり均一な組成を有する冷延帯鋼であって、
前記の板厚方向で強度と硬度が異なる冷延帯鋼は、板厚が1.0mm以上であることを特徴とする、板厚方向で強度と硬度が異なる冷延帯鋼。 - さらにCr、MoとB中の少なくとも1つを含有し、ただし、Cr含有量≦0.2%、Mo含有量≦0.2%、B含有量≦0.0035%であることを特徴とする、請求項1に記載の板厚方向で強度と硬度が異なる冷延帯鋼。
- 前記の板厚方向で強度と硬度が異なる冷延帯鋼は、B含有量≦0.0005wt%で、且つCr+Mn+Mo≦3.5wt%である;或いは、前記の板厚方向で強度と硬度が異なる冷延帯鋼は、B含有量範囲は0.0005~0.0035wt%で、且つCr+Mn+Mo≦2.5wt%であることを特徴とする、請求項2に記載の板厚方向で強度と硬度が異なる冷延帯鋼。
- さらにV、Ti、NbとW中の少なくとも1つを含有し、それらの含有量はV+Ti+Nb+W≦0.2wt%を満たすことを特徴とする、請求項1に記載の板厚方向で強度と硬度が異なる冷延帯鋼。
- 化学元素の質量百分率配合は:C 0.09~0.2wt%、Si 0.3~1.2wt%、Mn 1.5~2.5wt%、Al 0.02~0.08wt%、残部がFeとその他の不可避不純物であることを特徴とする、請求項1に記載の板厚方向で強度と硬度が異なる冷延帯鋼。
- 降伏強度が435~900MPaで、引張強度が820~1260MPaで、伸びが11~20%で、両面の硬度差が35~80HVであることを特徴とする、請求項1に記載の板厚方向で強度と硬度が異なる冷延帯鋼。
- 製錬、連続鋳造、熱間圧延、冷間圧延及び連続焼鈍の工程を含む、板厚方向で強度と硬度が異なり均一な組成を有する冷延帯鋼の製造方法であって、連続焼鈍工程で焼入する際に、帯鋼の両表面に非対称な焼入冷却プロセスを実施することを特徴とし、板厚方向で強度と硬度が異なる前記冷延帯鋼の化学元素の質量百分率配合は:C 0.06~0.3wt%、Si 0.01~2.5wt%、Mn 0.5~3wt%、Al 0.02~0.08wt%、残部がFeとその他の不可避不純物であり、板厚方向で強度と硬度が異なる前記冷延帯鋼の降伏強度≧420MPa、引張強度≧800MPa、伸び≧11%、両面の硬度差が少なくとも30HVであり、板厚方向で強度と硬度が異なる前記冷延帯鋼は、板厚が1.0mm以上である、板厚方向で強度と硬度が異なる冷延帯鋼の製造方法。
- 前記非対称な焼入冷却プロセスは、以下の少なくとも1つを含むことを特徴とする、請求項7に記載に板厚方向で強度と硬度が異なる冷延帯鋼の製造方法。
帯鋼の両表面の冷却開始温度は非対称である;
帯鋼の両表面の冷却終了温度は非対称である;
帯鋼の両表面の冷却速度は非対称である。 - 帯鋼の両表面の冷却開始温度が非対称である場合、帯鋼の両表面の冷却開始温度の差は20~100℃であることを特徴とする、請求項8に記載の板厚方向で強度と硬度が異なる冷延帯鋼の製造方法。
- 帯鋼の両表面の冷却開始温度が非対称である場合、帯鋼の両表面の冷却開始温度の差は25~100℃であることを特徴とする、請求項9に記載の板厚方向で強度と硬度が異なる冷延帯鋼の製造方法。
- 帯鋼の両表面の冷却終了温度が非対称である場合、帯鋼の両表面の冷却終了温度の差は40~200℃であることを特徴とする、請求項8に記載の板厚方向で強度と硬度が異なる冷延帯鋼の製造方法。
- 帯鋼の両表面の冷却終了温度が非対称である場合、帯鋼の両表面の冷却終了温度の差は50~180℃であることを特徴とする、請求項11に記載の板厚方向で強度と硬度が異なる冷延帯鋼の製造方法。
- 帯鋼の両表面の冷却速度が非対称である場合、帯鋼の両表面の冷却速度の差は25~200℃/sであることを特徴とする、請求項8に記載の板厚方向で強度と硬度が異なる冷延帯鋼の製造方法。
- 帯鋼の両表面の冷却速度が非対称である場合、帯鋼の両表面の冷却速度の差は40~200℃/sであることを特徴とする、請求項13に記載の板厚方向で強度と硬度が異なる冷延帯鋼の製造方法。
- 前記の板厚方向で強度と硬度が異なる冷延帯鋼は、板厚が1.4~2.5mmであることを特徴とする、請求項7に記載の板厚方向で強度と硬度が異なる冷延帯鋼の製造方法。
- さらにCr、MoとB中の少なくとも1つを含有し、ただし、B<0.0005wt%の場合、Cr+Mn+Mo≦3.5wt%;B含有量の範囲が0.0005~0.0035wt%である場合、Cr+Mn+Mo≦2.5wt%ことを特徴とする、請求項7に記載の板厚方向で強度と硬度が異なる冷延帯鋼の製造方法。
- さらにV、Ti、NbとW中の少なくとも1つを含有し、それらの含有量はV+Ti+Nb+W≦0.2wt%を満たすことを特徴とする、請求項7に記載の板厚方向で強度と硬度が異なる冷延帯鋼の製造方法。
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