JPWO2016152135A1 - 高強度鋼板およびその製造方法 - Google Patents
高強度鋼板およびその製造方法 Download PDFInfo
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- JPWO2016152135A1 JPWO2016152135A1 JP2016545380A JP2016545380A JPWO2016152135A1 JP WO2016152135 A1 JPWO2016152135 A1 JP WO2016152135A1 JP 2016545380 A JP2016545380 A JP 2016545380A JP 2016545380 A JP2016545380 A JP 2016545380A JP WO2016152135 A1 JPWO2016152135 A1 JP WO2016152135A1
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- Prior art keywords
- less
- steel sheet
- strength steel
- hot
- ferrite
- Prior art date
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 88
- 239000010959 steel Substances 0.000 title claims abstract description 88
- 238000004519 manufacturing process Methods 0.000 title claims description 19
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 64
- 239000002245 particle Substances 0.000 claims abstract description 20
- 239000013078 crystal Substances 0.000 claims abstract description 19
- 229910000734 martensite Inorganic materials 0.000 claims abstract description 17
- 239000000203 mixture Substances 0.000 claims abstract description 17
- 238000001556 precipitation Methods 0.000 claims abstract description 15
- 229910001567 cementite Inorganic materials 0.000 claims abstract description 11
- 229910001562 pearlite Inorganic materials 0.000 claims abstract description 11
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 9
- 229910001566 austenite Inorganic materials 0.000 claims abstract description 8
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 7
- 239000012535 impurity Substances 0.000 claims abstract description 7
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 6
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 5
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 4
- 238000002791 soaking Methods 0.000 claims description 27
- 238000005096 rolling process Methods 0.000 claims description 24
- 238000000137 annealing Methods 0.000 claims description 23
- 238000005098 hot rolling Methods 0.000 claims description 11
- 229910052802 copper Inorganic materials 0.000 claims description 5
- 238000005246 galvanizing Methods 0.000 claims description 5
- 229910052804 chromium Inorganic materials 0.000 claims description 4
- 239000010960 cold rolled steel Substances 0.000 claims description 4
- 229910052750 molybdenum Inorganic materials 0.000 claims description 3
- 229910052759 nickel Inorganic materials 0.000 claims description 2
- 238000000034 method Methods 0.000 description 17
- 238000001816 cooling Methods 0.000 description 14
- 239000002244 precipitate Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 238000005275 alloying Methods 0.000 description 7
- 238000005266 casting Methods 0.000 description 6
- 150000001247 metal acetylides Chemical class 0.000 description 6
- 238000007747 plating Methods 0.000 description 6
- 238000009864 tensile test Methods 0.000 description 6
- 238000004804 winding Methods 0.000 description 6
- 238000001953 recrystallisation Methods 0.000 description 5
- 230000000717 retained effect Effects 0.000 description 5
- 239000011573 trace mineral Substances 0.000 description 5
- 235000013619 trace mineral Nutrition 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 229910052719 titanium Inorganic materials 0.000 description 4
- 238000005097 cold rolling Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 238000005204 segregation Methods 0.000 description 3
- 239000006104 solid solution Substances 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 229910052720 vanadium Inorganic materials 0.000 description 2
- LBDSXVIYZYSRII-IGMARMGPSA-N alpha-particle Chemical compound [4He+2] LBDSXVIYZYSRII-IGMARMGPSA-N 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- 229910001563 bainite Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000005244 galvannealing Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 235000019362 perlite Nutrition 0.000 description 1
- 239000010451 perlite Substances 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
Classifications
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- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
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- 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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- B32B15/00—Layered products comprising a layer of metal
- B32B15/18—Layered products comprising a layer of metal comprising iron or steel
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- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
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- C21D6/005—Heat treatment of ferrous alloys containing Mn
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- C21D6/008—Heat treatment of ferrous alloys containing Si
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0273—Final recrystallisation annealing
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
- C23C28/32—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer
- C23C28/322—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer only coatings of metal elements only
- C23C28/3225—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer only coatings of metal elements only with at least one zinc-based layer
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C30/00—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C30/00—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process
- C23C30/005—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process on hard metal substrates
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold rolling
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
- Y10T428/12771—Transition metal-base component
- Y10T428/12785—Group IIB metal-base component
- Y10T428/12792—Zn-base component
- Y10T428/12799—Next to Fe-base component [e.g., galvanized]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
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- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
- Y10T428/12771—Transition metal-base component
- Y10T428/12861—Group VIII or IB metal-base component
- Y10T428/12951—Fe-base component
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y10T428/12—All metal or with adjacent metals
- Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
- Y10T428/12771—Transition metal-base component
- Y10T428/12861—Group VIII or IB metal-base component
- Y10T428/12951—Fe-base component
- Y10T428/12958—Next to Fe-base component
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
- Y10T428/12771—Transition metal-base component
- Y10T428/12861—Group VIII or IB metal-base component
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- Y10T428/12972—Containing 0.01-1.7% carbon [i.e., steel]
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Abstract
Description
本発明の高強度鋼板は、質量%で、C:0.02%以上0.10%未満、Si:0.10%未満、Mn:1.00%未満、P:0.10%以下、S:0.020%以下、Al:0.01%以上0.10%以下、N:0.010%以下、Nb:0.005%以上0.070%未満を含有する。また、本発明の高強度鋼板は、任意成分として、さらに、質量%で、Cr:0.3%以下、Mo:0.3%以下、B:0.005%以下、Cu:0.3%以下、Ni:0.3%以下のいずれか1種または2種以上を含有してもよい。上記以外の残部はFe及び不可避的不純物である。
Cは、Nb炭化物となったり、パーライトやマルテンサイトを増加させたりすることから、降伏強さと引張強さの増加に有効な元素である。C含有量が0.02%未満では所望のNb炭化物量が得られないので本発明が目的とする引張強さが得られない。C含有量が0.10%以上になるとNb炭化物の粒子径およびフェライト粒径が粗大化したり、パーライト、マルテンサイトが過度に生成したりするために降伏比と伸びフランジ性が低下する。このため、C含有量は0.02%以上0.10%未満とする。好ましくは0.02%以上とする。好ましくは0.06%以下とする。
Siは、一般にフェライトの固溶強化により降伏強さと引張強さを増加させるのに有効である。しかし、Siを添加すると、加工硬化能の顕著な向上により降伏強さに比べて引張強さの増加量が大きくなり、降伏比が低下し、表面性状が劣化する。そこで、Si含有量は0.10%未満とする。なお、Si含有量の下限は特に限定されず、Si含有量は少ないほど好ましい。原理上Si含有量は0%でもよいが、工業的には0.001%以上含有されることが多い。
Mnは、フェライトの固溶強化により降伏強さと引張強さを増加させるのに有効である。Mn含有量が1.0%以上になると、鋼組織中のマルテンサイト分率が増加するため引張強さが過度に増大し、本発明が目的とする引張強さが得られないため、降伏比と伸びフランジ性が低下する。このためMn含有量は1.0%未満とする。好ましくは0.2%以上とする。好ましくは0.8%以下とする。
Pはフェライトの固溶強化により降伏強さと引張強さを増加させるのに有効である。このため、本発明ではPを適宜含有することができる。しかし、P含有量が0.10%を超えると、鋳造偏析やフェライト粒界偏析によりフェライト粒界が脆化して伸びフランジ性が低下する。このためP含有量は0.10%以下とする。原理上P含有量は0%でもよいが、好ましくは0.01%以上0.04%以下とする。
Sは不純物として不可避的に含まれる元素である。MnSなどの介在物の形成により伸びフランジ性や局部伸びが低下するので、S含有量はできるだけ低減することが好ましい。本発明においてS含有量は0.020%以下とする。好ましくは0.015%以下とする。原理上S含有量は0%でもよいが、工業的には0.0001%以上含有されることが多い。
Alは精錬工程での脱酸のため、また、固溶NをAlNとして固定させるために添加される。十分な効果を得るにはAl含有量を0.01%以上にする必要がある。また、Al含有量が0.10%を超えるとAlNが多量に析出して伸びフランジ性が低下する。したがってAl含有量は0.01%以上0.10%以下とする。好ましくは0.01%以上0.07%以下とする。また、さらに好ましくは0.01%以上0.06%以下とする。
Nは溶銑の精錬工程までに不可避的に混入する元素である。N含有量が0.01%を超えると、鋳造時にNb炭化物が析出後、スラブ加熱時にNb炭化物が溶解せず粗大な炭化物として残留するためフェライト平均結晶粒の粗大化を招く。よってN含有量は0.010%以下とする。原理上N含有量は0%でもよいが、工業的には0.0001%以上含有されることが多い。
Nbはフェライト平均結晶粒の微細化、Nb炭化物の析出による降伏比の増加に寄与する重要な元素である。Nb含有量が0.005%未満ではNb炭化物の体積率が不十分となりこの効果が小さい。また、Nb含有量が0.070%以上ではNb炭化物が過剰に析出して焼鈍後も延性に乏しい未再結晶フェライトが残存するため伸びフランジ性が劣化する。したがって、Nb含有量は0.005%以下0.070%未満とする。好ましくは0.010%以上とする。好ましくは0.040%以下とする。
Crは本発明の作用効果を害さない微量元素として含有してもよい。Cr含有量が0.3%を超えると焼入性の向上によりマルテンサイトが過剰に生成して降伏比の低下を招く場合がある。したがって、Crを添加する場合、Cr含有量は0.3%以下とする。
Moは本発明の作用効果を害さない微量元素として含有してもよい。しかしながら、Mo含有量が0.3%を超えると焼入性の向上によりマルテンサイトが過剰に生成して降伏比の低下を招く場合がある。したがって、Moを添加する場合、Mo含有量は0.3%以下とする。
Bは本発明の作用効果を害さない微量元素として含有してもよい。しかしながら、B含有量が0.005%を超えると焼入性の向上によりマルテンサイトが過剰に生成して降伏比の低下を招く場合がある。したがって、Bを添加する場合、B含有量は0.005%以下とする。
Cuは本発明の作用効果を害さない微量元素として含有してもよい。しかしながら、Cu含有量が0.3%を超えると焼入性の向上によりマルテンサイトが過剰に生成して降伏比の低下を招く場合がある。したがって、Cuを添加する場合、Cu含有量は0.3%以下とする。
Niは本発明の作用効果を害さない微量元素として含有してもよい。しかしながら、Ni含有量が0.3%を超えると焼入性の向上によりマルテンサイトが過剰に生成して降伏比の低下を招く場合がある。したがって、Niを添加する場合、Ni含有量は0.3%以下とする。
本発明の高強度鋼板の鋼組織は、面積率でフェライト:85%以上、パーライト:0〜15%、マルテンサイト、残留オーステナイトおよびセメンタイトの合計:0〜3%からなる。また、この鋼組織において、上記フェライトの平均結晶粒径は15.0μm以下であり、Nb炭化物の粒子径は5〜50nmであり、Nb炭化物の析出量は体積率で0.005〜0.050%である。
フェライトは良好な延性を有し、鋼組織に主相として含まれ、その含有量は面積率で85%以上である。フェライトの含有量が面積率で85%未満では本発明が目的とする高降伏比と優れた伸びフランジ性が得られない。よって、フェライトの含有量は面積率で85%以上とする。好ましくは95%以上とする。なお、本発明の高強度鋼板の鋼組織はフェライト単相(フェライトの含有量が面積率で100%)でもよい。
パーライトは所望の降伏強さと引張強さを得るために有効である。しかし、パーライトの含有量が面積率で15%を超えると本発明が目的とする高降伏比と優れた伸びフランジ性が得られない。このためパーライトの含有量は面積率で0〜15%とする。好ましくは0〜5%とする。
鋼組織は、マルテンサイト、残留オーステナイトおよびセメンタイトを合計で0〜3%含有してもよい。マルテンサイト、残留オーステナイトおよびセメンタイトの合計が3%を超えると0.70以上の降伏比が得られなくなる。このためマルテンサイト、残留オーステナイトおよびセメンタイトの合計は0〜3%とする。
フェライトの平均結晶粒径を所望の範囲に調整することは、本発明が目的とする0.70以上の高降伏比を得るために重要である。フェライトの平均結晶粒径が15.0μmを超えると、0.70以上の降伏比が得られない。したがって、フェライトの平均結晶粒径は15.0μm以下とする。好ましくは10.0μm以下とする。なお、フェライト平均結晶粒径の下限は特に限定されないが、1.0μm未満では引張強さや降伏強さが過度に増加し、伸びフランジ性や伸びの劣化を招くのでフェライト平均粒径は1.0μm以上であることが好ましい。
Nb炭化物は主にフェライト粒内に析出し、主としてNbCで構成され、その粒子径は本発明が目的とする高降伏比と優れた伸びフランジ性を得るのに重要である。上記粒子径が5nm未満では降伏強さが過度に増加し、本発明が目的とする範囲を外れるばかりか、伸びフランジ性の低下も招く。上記粒子径が50nmを超えると降伏強さの増加が不十分となり、本発明が目的とする高降伏比が得られない。よってNb炭化物の粒子径は5〜50nmとする。好ましくは10nm以上とする。好ましくは30nm以下とする。
Nb炭化物の析出量を所望の範囲に調整することは、本発明が目的とする高降伏比と優れた伸びフランジ性の両立に重要である。Nb炭化物の析出量が体積率で0.005%未満だと降伏強さの増加が不十分となり、本発明が目的とする高降伏比が得られない。Nb炭化物の析出量が体積率で0.050%を超えるとフェライトの再結晶が顕著に抑制されて伸びフランジ性が低下する。また、上記析出量が0.050%を超えると、引張強さが過度に増加して本発明が目的とする範囲を外れる場合がある。よってNb炭化物の析出量は体積率で0.005〜0.050%とする。好ましくは0.010%以上とする。好ましくは0.030%以下とする。
本発明の高強度鋼板は上記成分組成を有する鋼を溶製し、鋳造によりスラブ(鋼片)を製造後、熱間圧延、冷間圧延後、連続焼鈍炉で焼鈍を行うことにより製造される。熱間圧延後に酸洗してもよい。以下、これら製造条件の限定条件について説明する。なお、以下の説明において温度は表面温度を意味する。
仕上圧延温度〜650℃の温度域の保持時間を適正に制御することで、フェライトの平均結晶粒径の粗大化を抑制することができる。このため、上記冷却条件は、本発明において重要である。仕上圧延後の冷却において仕上圧延温度〜650℃の温度域の保持時間が10秒を超えると、熱間圧延の巻取後に粗大なNb炭化物が過度に析出するため、焼鈍時にフェライト粒が粗大になりやすくなりフェライトの平均結晶粒径が15.0μmを超えるため降伏比が低下する。そこで、上記冷却における、仕上圧延温度〜650℃の温度域の保持時間は10秒以下とする。なお、上記保持時間の下限は特に限定されないが、焼鈍時に均一にNb炭化物を析出させてフェライト粒径を均一にする観点から1秒以上保持することが好ましい。
巻取温度は、Nb炭化物の析出量および析出物粒子径により焼鈍後のフェライト平均結晶粒径を15.0μm以下に制御するために重要である。鋼板の幅方向中央において、巻取温度が500℃未満では巻取後の冷却中にNb炭化物が十分析出せず、焼鈍の加熱および均熱時に粗大なNb炭化物が析出し、フェライト粒径が粗大化するため、本発明が目的とする引張強さと高降伏比が得られない。巻取温度が700℃を超えると巻取後の冷却中に粗大なNb炭化物が析出し、焼鈍時にフェライト粒径が粗大化するため、本発明が目的とする引張強さと高降伏比が得られない。したがって巻取温度は500〜700℃とする。好ましくは550〜650℃とする。
昇温時の650〜750℃における保持時間は焼鈍後のフェライト平均結晶粒径を15.0μm以下に制御するために重要な製造条件である。昇温時の650〜750℃における保持時間が15秒未満では昇温中にフェライトの再結晶が完了しないため、比較的高温な均熱保持時に再結晶が進行してフェライト平均結晶粒径が粗大化する。よって昇温時の650〜750℃における保持時間は15秒以上とする。好ましくは昇温時の650〜750℃における保持時間は20秒以上とする。なお、保持時間の上限は特に限定されないが、保持時間が長くなりすぎるとNb炭化物の粗大化を招くので、保持時間は300秒以下が好ましい。なお、ここでの保持時間は、650〜750℃の温度域での滞留時間を意味する。
均熱温度および均熱時間はフェライト平均結晶粒径を制御する上で重要な要件である。均熱温度が760℃未満ではフェライトの再結晶が不十分となり伸びフランジ性が劣化する。均熱温度が880℃を超えるとフェライト平均結晶粒径が粗大化して本発明が目的とする引張強さと降伏比が得られない。このため均熱温度は760〜880℃とする。また均熱時間が120秒を超えると、フェライト平均結晶粒径が粗大化するため本発明が目的とする引張強さと高降伏比が得られない。このため均熱時間は120秒以下とする。好ましくは60秒以下とする。なお、均熱時間の下限は特に限定されないが、伸びフランジ性の観点からフェライトを完全に再結晶させることが好ましいため均熱時間は30秒以上が好ましい。なお、ここでの均熱時間は、760〜880℃の温度域での滞留時間を意味する。
Claims (7)
- 成分組成は、質量%で、C:0.02%以上0.10%未満、Si:0.10%未満、Mn:1.0%未満、P:0.10%以下、S:0.020%以下、Al:0.01%以上0.10%以下、N:0.010%以下、Nb:0.005%以上0.070%未満を含有し、残部がFeおよび不可避的不純物からなり、
鋼組織は、面積率でフェライト:85%以上、パーライト:0〜15%、マルテンサイト、残留オーステナイトおよびセメンタイトの合計:0〜3%からなり、
前記フェライトの平均結晶粒径が15.0μm以下であり、
Nb炭化物の粒子径が5〜50nmであり、Nb炭化物の析出量が体積率で0.005〜0.050%である高強度鋼板。 - 前記成分組成、さらに、質量%で、Cr:0.3%以下、Mo:0.3%以下、B:0.005%以下、Cu:0.3%以下、Ni:0.3%以下のいずれか1種または2種以上を含有する請求項1に記載の高強度鋼板。
- 高強度鋼板の表面に溶融亜鉛めっき層を有する請求項1または2に記載の高強度鋼板。
- 前記溶融亜鉛めっき層が、合金化溶融亜鉛めっき層である請求項3に記載の高強度鋼板。
- 請求項1または2に記載の鋼組成を有する鋼片を熱間圧延後、仕上圧延温度〜650℃の温度域の保持時間を10秒以下の条件で熱延鋼板を冷却し、500〜700℃で巻取後、熱延鋼板を冷間圧延し、冷延鋼板を連続焼鈍炉で、昇温時において650〜750℃の温度域での保持時間:15秒以上、該保持後に均熱温度:760〜880℃、均熱時間;120秒以下の条件で均熱する焼鈍を施す高強度鋼板の製造方法。
- 前記焼鈍後において、高強度鋼板の表面に溶融亜鉛めっきを施す請求項5に記載の高強度鋼板の製造方法。
- 前記溶融亜鉛めっきに合金化処理を施す請求項6に記載の高強度鋼板の製造方法。
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