JP7019574B2 - 高強度溶融亜鉛めっき鋼帯 - Google Patents
高強度溶融亜鉛めっき鋼帯 Download PDFInfo
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- JP7019574B2 JP7019574B2 JP2018531250A JP2018531250A JP7019574B2 JP 7019574 B2 JP7019574 B2 JP 7019574B2 JP 2018531250 A JP2018531250 A JP 2018531250A JP 2018531250 A JP2018531250 A JP 2018531250A JP 7019574 B2 JP7019574 B2 JP 7019574B2
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- steel strip
- steel
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- rolled
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- 229910001335 Galvanized steel Inorganic materials 0.000 title claims description 27
- 239000008397 galvanized steel Substances 0.000 title claims description 27
- 229910000831 Steel Inorganic materials 0.000 claims description 218
- 239000010959 steel Substances 0.000 claims description 218
- 229910001566 austenite Inorganic materials 0.000 claims description 42
- 229910000859 α-Fe Inorganic materials 0.000 claims description 40
- 238000000034 method Methods 0.000 claims description 39
- 238000000137 annealing Methods 0.000 claims description 37
- 229910001563 bainite Inorganic materials 0.000 claims description 34
- 238000005096 rolling process Methods 0.000 claims description 32
- 229910052720 vanadium Inorganic materials 0.000 claims description 31
- 230000000717 retained effect Effects 0.000 claims description 28
- 229910000734 martensite Inorganic materials 0.000 claims description 27
- 239000000203 mixture Substances 0.000 claims description 27
- 239000002244 precipitate Substances 0.000 claims description 25
- 238000001816 cooling Methods 0.000 claims description 22
- 238000005246 galvanizing Methods 0.000 claims description 21
- 238000010438 heat treatment Methods 0.000 claims description 21
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- 239000000463 material Substances 0.000 claims description 19
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- 229910052796 boron Inorganic materials 0.000 claims description 18
- 238000005097 cold rolling Methods 0.000 claims description 17
- 238000005554 pickling Methods 0.000 claims description 17
- 238000010791 quenching Methods 0.000 claims description 16
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- 238000005496 tempering Methods 0.000 claims description 15
- 229910052782 aluminium Inorganic materials 0.000 claims description 14
- 229910052799 carbon Inorganic materials 0.000 claims description 14
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- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 claims description 14
- 230000008569 process Effects 0.000 claims description 14
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- 229910001039 duplex stainless steel Inorganic materials 0.000 claims description 3
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 29
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- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 3
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- AGVJBLHVMNHENQ-UHFFFAOYSA-N Calcium sulfide Chemical compound [S-2].[Ca+2] AGVJBLHVMNHENQ-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
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- 229910000725 T1 high speed steel Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
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- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
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- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
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- CADICXFYUNYKGD-UHFFFAOYSA-N sulfanylidenemanganese Chemical compound [Mn]=S CADICXFYUNYKGD-UHFFFAOYSA-N 0.000 description 1
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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
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- 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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- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
- C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
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- C22C—ALLOYS
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
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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
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
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- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
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- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
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- 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
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
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- 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
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
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- 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
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/26—After-treatment
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- 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
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
- C23C2/36—Elongated material
- C23C2/40—Plates; Strips
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- 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
- C21D2211/001—Austenite
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- 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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- 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
- C21D2211/008—Martensite
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- 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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- 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
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0268—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment between cold rolling steps
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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]
Description
0.10~0.21%のC
1.45~2.20%のMn
最大1.50%のSi
0.1~1.50%のAl
0.001~0.04%のP
0.0005~0.005%のB
0.005~0.30%のV
最大0.015%のN
最大0.05%のS
および、所望により、以下から選択される1以上の成分、
最大0.004%のCa
最大0.10%のNb
最大0.50%のCr
最大0.20%のMo
最大0.20%のNi
最大0.20%のCu
最大0.20%のTi、
ならびに、残部のFeおよび不可避不純物からなる組成物、
を含む、高強度溶融亜鉛めっき鋼帯を提供することにより、本発明により達成することができる。
a)鋳鋼を2.0~4.0mmの厚さへ熱間圧延し、コイル化温度CTで、コイル化熱間圧延鋼帯へコイル化する、工程と、
b)前記鋼帯を酸洗する、工程と、
c)前記鋼帯を40%超の圧下率で冷間圧延する、工程と、
d)前記鋼帯を変態区間焼鈍する、工程と、
e)前記鋼帯を過時効区間における焼鈍後に、過時効区間において、所望により、急冷および分割、または急冷および焼戻しする、工程と、
f)前記鋼帯を調質圧延する、工程と、
を含む、高強度亜鉛めっき鋼帯の製造方法が提供される。
a)本発明により製造した熱間圧延鋼帯を供給する工程、
(コイル化した前記熱間圧延鋼帯は、40~80体積%のフェライト、好ましくは50~70体積%のフェライトと、20~50体積%のパーライトおよび/またはベイナイト、好ましくは30~50体積%のパーライトおよび/またはベイナイトと、10体積%未満のセメンタイト/析出物/含有物とからなる(但し、これらの合計は最大100%である。)微細構造を有する。当該微細構造は、最終生成物の低い異方性を保証するような質感である。)
b)前記鋼帯を酸洗する工程、
c)前記鋼帯を40%超の圧下率、好ましくは45~75%の圧下率で冷間圧延する工程、
d)前記鋼帯を、変態温度Ac1~Ac3、好ましくはAc1+50℃~Ac3-30℃の焼鈍加熱温度に供し、その後温度がAc3未満になるときの冷却速度Vcsで1以上の相を冷却し、その後、前記鋼の微細構造がフェライト、ベイナイト、残留オーステナイト、および所望によりマルテンサイトおよび/またはセメンタイトおよび含有物/析出物からなるように選択された、過時効時間toaの間、過時効温度Toaで、相を過時効処理する工程、
e)所望により鋼帯を、過時効区分において、急冷および分割、または急冷および焼戻しに供する工程、
f)前記鋼帯を溶融亜鉛めっきする工程、
g)前記鋼帯を、0.7%未満、好ましくは0.5%未満の伸長率で調質圧延する工程、
を含む。
a)本発明により製造した熱間圧延鋼帯を供給する工程、
(コイル化した前記熱間圧延鋼帯は、40~80体積%のフェライト、好ましくは50~70体積%のフェライトと、20~50体積%のパーライトおよび/またはベイナイト、好ましくは30~50体積%のパーライトおよび/またはベイナイトと、10体積%未満のセメンタイト/析出物/含有物とからなる(但し、これらの合計は最大100%である。)微細構造を有する。)
b)前記鋼帯を酸洗する工程、
c)前記鋼帯を40%超の圧下率、好ましくは45~75%の圧下率で冷間圧延する工程、
d)前記鋼帯を、Ac1+50℃超で焼鈍加熱処理し、その後、温度がAc3未満である場合の冷却速度Vcsで1以上の相を冷却し、その後、前記鋼の微細構造がフェライト、ベイナイト、残留オーステナイト、および所望によりマルテンサイトおよび/またはセメンタイト、析出物および含有物からなるように選択された、過時効時間toaの間、過時効温度Toaで、相を冷却する工程、
e)所望により鋼帯を、過時効区分において、急冷および分割、または急冷および焼戻しに供する工程、
f)前記鋼帯を亜鉛コーティング、好ましくは溶融亜鉛めっきする工程、
g)前記鋼帯を、0.4~2.0%の圧下率、好ましくは0.4~1.2%の圧下率で調質圧延する工程、
を含む。
鋼組成物L2を鋳造し、約920℃の温度Ac3超の約930℃の最終温度まで熱間圧延して、約100℃/秒の冷却速度で、約510℃のコイル化温度まで冷却した。材料を次に、1℃/分の冷却速度で室温まで冷却した。突き当て定規は3.7mmであった。材料を1.2mmまで冷間圧延して、次に、約840℃の最高温度で連続的に焼鈍して、約400℃まで冷却して、60秒間この温度で維持して、その後、亜鉛めっきのために約470℃まで加熱して、最終的に室温まで冷却した。測定した引張特性は、表3に記載する。
1.3mmの寸法を有するT1鋼組成物からなるいくつかのコイルを、実施例1と同じ条件下で製造した。さらに、テンパーミル伸長率0.4%を適用した。均質性試験を、前記コイルの亜鉛コートした鋼帯最終生成物に行った。引張特性RpおよびRmを、コイルの開始、中間、および最終で、コイルの中間幅位置、端部位置で測定した。図1に示される実験結果は、コイルの頭部、胴部および尾部での組成物L1の降伏応力、引張強度値であり、これらは最大30MPaで変化する。
鋼組成物からT1複合相鋼帯を実施例1と同様に熱間圧延し、1.3mmへ冷間圧延して、約80℃で少なくとも40秒間記載にしたがって焼鈍して製造した。溶融亜鉛めっき後、約0.9%の圧下率で鋼帯を調質圧延した。得られた鋼帯は、表3の例と比較して向上したRpを有する複合相鋼である。
バナジウムを含まない鋼組成物T0およびバナジウムを含むT1を製造した。1.3mmの寸法の冷間圧延鋼組成物T0およびT1を連続的に焼鈍した。770~880℃の範囲の温度で焼鈍均熱処理(anneling soak)を行った。その後、試料を390~470℃で過時効処理し、460℃で数秒間亜鉛コーティングし、室温まで冷却した。引張試験を、各焼鈍条件で行った。
Claims (16)
- 質量%において、以下の成分、
0.11~0.19%のC
1.45~2.20%のMn
最大1.50%のSi
0.1~1.50%のAl
0.001~0.04%のP
0.0005~0.005%のB
0.005~0.30%のV
最大0.015%のN
最大0.05%のS
および、所望により、以下から選択される1以上の成分、
最大0.004%のCa
最大0.10%のNb
最大0.50%のCr
最大0.20%のMo
最大0.20%のNi
最大0.20%のCu
最大0.20%のTi
(Al+Siの量は、0.70~1.60質量%である。)
残部のFeおよび不可避不純物からなる組成物、
からなり、
650MPa超の最大抗張力Rm、および/または、調質圧延後に300~700MPaの0.2%耐力Rpを有する、高強度溶融亜鉛めっき鋼帯。 - Al+Siの量が0.70~1.50質量%である、請求項1に記載の鋼帯。
- Cの量が0.12~0.18質量%である、請求項1または2に記載の鋼帯。
- Siの量が0.05~1.0質量%である、請求項1~3のいずれか一項に記載の鋼帯。
- Bの量が0.001~0.005質量%である、請求項1~4のいずれか一項に記載の鋼帯。
- Vの量が0.01~0.20質量%である、請求項1~5のいずれか一項に記載の鋼帯。
- Alの量が0.1~1.0質量%である、請求項1~6のいずれか一項に記載の鋼帯。
- Mnの量が1.45~2.10質量%である、請求項1~7のいずれか一項に記載の鋼帯。
- 前記鋼帯は、20~50体積%のフェライト、15~25体積%の残留オーステナイトおよびマルテンサイトからなる微細構造を有し、前記残留オーステナイトの含有量は5~15体積%であり、残部は焼戻しマルテンサイト、ベイナイト、セメンタイトおよび析出物/含有物であり、合計は最大100%である、請求項1~8のいずれか一項に記載の鋼帯。
- 前記耐力Rpおよび/または最大抗張力Rmについて、前記鋼帯の中央および端部の差は60MPa未満である、請求項1~9のいずれか一項に記載の鋼帯。
- a)鋳鋼を2.0~4.0mmの厚さへ熱間圧延し、コイル化温度CTでコイル化し、前記コイル化した熱間圧延鋼帯は、40~80体積%のフェライト、20~50体積%のパーライトおよび/またはベイナイト、ならびに10体積%未満のセメンタイト/析出物/含有物からなる微細構造を有し、合計は最大100%である、工程と、
b)前記鋼帯を酸洗する、工程と、
c)前記鋼帯を40%以上の圧下率で冷間圧延する、工程と、
d)前記鋼帯を変態区間焼鈍する、工程と、
e)前記鋼帯を過時効区間において焼鈍後に、所望により、急冷および分配、または急冷および焼戻しする、工程と、
f)前記鋼帯を調質圧延する、工程と、
を含む、請求項1~10のいずれか一項に記載の、高強度溶融亜鉛めっき鋼帯の製造方法。 - 前記工程a)において、前記鋳鋼を2.0~4.0mmの厚さへ熱間圧延し、Bs+50℃~Ms温度のコイル化温度CTでコイル化し、40~80体積%のフェライト、20~50体積%のパーライトおよび/またはベイナイト、ならびに10体積%未満のセメンタイト/析出物/含有物からなる微細構造を有し、合計は最大100%である、中間熱間圧延鋼帯を得る、請求項11に記載の方法。
- 前記冷間圧延材料は、請求項11の工程d)にしたがって変態区間焼鈍され、最大40℃/秒の加熱速度が使用され、および/または、1~100秒の中間酸洗が、Ac1温度に達する前に使用され、TRIP支援二重相鋼中に存在するフェライト画分の90%以上の再結晶化フェライトを有する鋼帯が得られ、0.18以上のn4~6値が得られ、前記n4~6値は4~6%の伸長率の焼入特性値である、TRIP支援二重相鋼の製造のための請求項11または12に記載の方法。
- 前記鋼帯がTRIP支援二重相または複合相鋼帯である、請求項1~10のいずれか一項に記載の鋼帯。
- a)請求項11の工程a)による中間熱間圧延鋼帯を提供する工程と、
b)前記鋼帯を酸洗する工程と、
c)前記鋼帯を次に、40%以上の圧下率で冷間圧延する工程と、
d)前記鋼帯を、変態温度Ac1~Ac3の焼鈍加熱温度に供し、その後温度がAc3未満になるときの冷却速度Vcsで1以上の相を冷却し、その後、前記鋼の微細構造がフェライト、ベイナイト、残留オーステナイト、および所望によりマルテンサイトおよび/またはセメンタイトおよび含有物/析出物からなるように選択された、過時効時間toaの間、過時効温度Toaで、相を過時効処理する工程、
e)所望により鋼帯を、過時効区分において、急冷および分配、または急冷および焼戻しに供する工程、
f)前記鋼帯を溶融亜鉛めっきする工程、
g)前記鋼帯を、0.7%未満の伸長率で調質圧延する工程、
を含む、請求項1~10のいずれか一項に記載の、高強度冷間圧延TRIP支援二相鋼帯の製造のための、請求項11に記載の方法。 - a)請求項11の工程a)による中間熱間圧延鋼帯を提供する工程と、
b)前記鋼帯を酸洗する工程と、
c)前記鋼帯を次に、40%超の圧下率で冷間圧延する工程と、
d)前記鋼帯を、Ac1+50℃超で焼鈍加熱処理し、その後、温度がAc3未満である場合の冷却速度Vcsで1以上の相を冷却し、その後、前記鋼の微細構造がフェライト、ベイナイト、残留オーステナイト、および所望によりマルテンサイトおよび/またはセメンタイトからなるように選択された、過時効時間toaの間、過時効温度Toaで、相を冷却する工程、
e)所望により鋼帯を、過時効区分において、急冷および分配、または急冷および焼戻しに供する工程、
f)前記鋼帯を溶融亜鉛めっきする工程、
g)前記鋼帯を、0.4~2.0%の圧下率で調質圧延する工程、
を含む、請求項1~10のいずれか一項に記載の、高強度冷間圧延TRIP支援二相鋼帯の製造のための、請求項11に記載の方法。
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