TWI456074B - 深擠壓性優異之高強度熔融鍍鋅鋼板及其製造方法 - Google Patents

深擠壓性優異之高強度熔融鍍鋅鋼板及其製造方法 Download PDF

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TWI456074B
TWI456074B TW101130630A TW101130630A TWI456074B TW I456074 B TWI456074 B TW I456074B TW 101130630 A TW101130630 A TW 101130630A TW 101130630 A TW101130630 A TW 101130630A TW I456074 B TWI456074 B TW I456074B
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less
steel sheet
galvanized steel
hot
mass
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TW201313915A (zh
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Hideyuki Kimura
Kaneharu Okuda
Yasunobu Nagataki
Kenji Kawamura
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Jfe Steel Corp
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    • 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
    • B32B15/013—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 a metal other than iron or aluminium
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    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
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Claims (9)

  1. 一種深擠壓性優異之高強度熔融鍍鋅鋼板，其特徵在於，具有以質量%計含有C：0.010%以上且0.04%以下、Si：超過1.0%且1.5%以下、Mn：1.0%以上且3.0%以下、P：0.005%以上且0.1%以下、S：0.01%以下、sol.Al：0.005%以上且0.5%以下、N：0.01%以下、Nb：0.010%以上且未達0.05%、Ti：0.015%以上且0.120%以下，且鋼中之Nb及C之含量(質量%)滿足(Nb/93)/(C/12)<0.20之關係，進而滿足0.005<C*≦0.020，剩餘部分包含Fe及不可避免之雜質之成分組成，鋼板組織具有以面積率計為80%以上之肥粒鐵與3%以上之麻田散鐵，拉伸強度為440MPa以上，平均r值為1.30以上且r值之面內異向性(△r)以絕對值計為0.20以下，此處，以C*=C-(12/93)Nb-(12/48){Ti-(48/14)N-(48/32)S}表示，C、Nb、Ti、N、S分別表示鋼中之各元素之含量(質量%)。
  2. 如申請專利範圍第1項之深擠壓性優異之高強度熔融鍍鋅鋼板，其中，除上述成分組成以外，以質量%計更含有合計超過0%且0.5%以下之Mo、Cr、V之1種或2種以上。
  3. 如申請專利範圍第1項之深擠壓性優異之高強度熔融鍍鋅鋼板，其中， 除上述成分組成以外，以質量%計更含有Cu：超過0%、0.3%以下、Ni：超過0%、0.3%以下之1種或2種。
  4. 如申請專利範圍第2項之深擠壓性優異之高強度熔融鍍鋅鋼板，其中，除上述成分組成以外，以質量%計更含有Cu：超過0%且0.3%以下、Ni：超過0%且0.3%以下之1種或2種。
  5. 如申請專利範圍第1至4項中任一項之深擠壓性優異之高強度熔融鍍鋅鋼板，其中，除上述成分組成以外，以質量%計更含有Sn：超過0%且0.20%以下、Sb：超過0%且0.20%以下之1種或2種。
  6. 如申請專利範圍第1至4項中任一項之深擠壓性優異之高強度熔融鍍鋅鋼板，其中，除上述成分組成以外，以質量%計進而包含Ta：0.01~0.10%，且代替上述C*，下述C*為滿足0.005<C*≦0.020而含有，此處，以C*=C-(12/93)Nb-(12/181)Ta-(12/48){Ti-(48/14)N-(48/32)S}表示，C、Nb、Ta、Ti、N、S分別表示鋼中之各元素之含量(質量%)。
  7. 如申請專利範圍第5項之深擠壓性優異之高強度熔融鍍鋅鋼板，其中，除上述成分組成以外，以質量%計進而包含Ta：0.01~0.10%，且代替上述C*，下述C*為滿足0.005<C*≦0.020 而含有，此處，以C*=C-(12/93)Nb-(12/181)Ta-(12/48){Ti-(48/14)N-(48/32)S}表示，C、Nb、Ta、Ti、N、S分別表示鋼中之各元素之含量(質量%)。
  8. 一種深擠壓性優異之高強度熔融鍍鋅鋼板之製造方法，其特徵在於，於將具有申請專利範圍第1至7項中任一項之成分組成之鋼進行熱軋、冷軋後，以未達3℃/s之平均加熱速度加熱700~800℃之溫度區，以800~950℃之退火溫度進行退火，自上述退火溫度起以3~15℃/s之平均冷卻速度冷卻，浸漬於鍍鋅浴中實施熔融鍍鋅，於上述熔融鍍鋅後，以5~100℃/s之平均冷卻速度冷卻，或者於上述熔融鍍鋅後，進而實施鍍鋅之合金化處理，於上述合金化處理後，以5~100℃/s之平均冷卻速度冷卻。
  9. 如申請專利範圍第8項之深擠壓性優異之高強度熔融鍍鋅鋼板之製造方法，其中，於上述熱軋之精軋結束後，在3秒以內開始冷卻，以40℃/s以上之平均冷卻速度冷卻至720℃為止，以超過600℃且700℃以下之捲取溫度捲取，且將上述冷軋之軋壓率設為50%以上。
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