JP7213978B2 - 冷間圧延熱処理鋼板及びその製造方法 - Google Patents
冷間圧延熱処理鋼板及びその製造方法 Download PDFInfo
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- JP7213978B2 JP7213978B2 JP2021529405A JP2021529405A JP7213978B2 JP 7213978 B2 JP7213978 B2 JP 7213978B2 JP 2021529405 A JP2021529405 A JP 2021529405A JP 2021529405 A JP2021529405 A JP 2021529405A JP 7213978 B2 JP7213978 B2 JP 7213978B2
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- steel sheet
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- treated steel
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- 229910000831 Steel Inorganic materials 0.000 title claims description 94
- 239000010959 steel Substances 0.000 title claims description 94
- 238000004519 manufacturing process Methods 0.000 title claims description 4
- 229910001566 austenite Inorganic materials 0.000 claims description 28
- 229910000734 martensite Inorganic materials 0.000 claims description 28
- 229910052710 silicon Inorganic materials 0.000 claims description 23
- 229910052799 carbon Inorganic materials 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 19
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 18
- 239000010703 silicon Substances 0.000 claims description 18
- 239000010960 cold rolled steel Substances 0.000 claims description 15
- 230000000717 retained effect Effects 0.000 claims description 15
- 239000000203 mixture Substances 0.000 claims description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 13
- 238000001816 cooling Methods 0.000 claims description 13
- 238000000137 annealing Methods 0.000 claims description 12
- 239000011651 chromium Substances 0.000 claims description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 10
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 9
- 229910052804 chromium Inorganic materials 0.000 claims description 9
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 8
- 229910052782 aluminium Inorganic materials 0.000 claims description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 8
- 229910052750 molybdenum Inorganic materials 0.000 claims description 8
- 239000011733 molybdenum Substances 0.000 claims description 8
- 238000003303 reheating Methods 0.000 claims description 8
- 229910001563 bainite Inorganic materials 0.000 claims description 7
- 238000010791 quenching Methods 0.000 claims description 7
- 230000000171 quenching effect Effects 0.000 claims description 7
- 229910001297 Zn alloy Inorganic materials 0.000 claims description 5
- 238000005097 cold rolling Methods 0.000 claims description 5
- 229910052742 iron Inorganic materials 0.000 claims description 5
- 229910000838 Al alloy Inorganic materials 0.000 claims description 4
- 230000001186 cumulative effect Effects 0.000 claims description 3
- 238000005098 hot rolling Methods 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 238000005554 pickling Methods 0.000 claims description 3
- 238000003723 Smelting Methods 0.000 claims description 2
- 238000005266 casting Methods 0.000 claims description 2
- 229910001338 liquidmetal Inorganic materials 0.000 description 7
- 230000003647 oxidation Effects 0.000 description 7
- 238000007254 oxidation reaction Methods 0.000 description 7
- 230000002411 adverse Effects 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 5
- 239000010955 niobium Substances 0.000 description 5
- 239000010936 titanium Substances 0.000 description 5
- 230000009466 transformation Effects 0.000 description 5
- 239000011572 manganese Substances 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 4
- 238000005728 strengthening Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 239000011701 zinc Substances 0.000 description 4
- -1 zinc-nickel alloys Chemical compound 0.000 description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 3
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 3
- 238000007792 addition Methods 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 229910052748 manganese Inorganic materials 0.000 description 3
- 229910052758 niobium Inorganic materials 0.000 description 3
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 3
- 230000036961 partial effect Effects 0.000 description 3
- 229910052719 titanium Inorganic materials 0.000 description 3
- 229910001335 Galvanized steel Inorganic materials 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
- 229910000861 Mg alloy Inorganic materials 0.000 description 2
- 229910000990 Ni alloy Inorganic materials 0.000 description 2
- PGTXKIZLOWULDJ-UHFFFAOYSA-N [Mg].[Zn] Chemical compound [Mg].[Zn] PGTXKIZLOWULDJ-UHFFFAOYSA-N 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000007598 dipping method Methods 0.000 description 2
- 238000001887 electron backscatter diffraction Methods 0.000 description 2
- 239000008397 galvanized steel Substances 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- QELJHCBNGDEXLD-UHFFFAOYSA-N nickel zinc Chemical compound [Ni].[Zn] QELJHCBNGDEXLD-UHFFFAOYSA-N 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 229910052720 vanadium Inorganic materials 0.000 description 2
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910001567 cementite Inorganic materials 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 238000007571 dilatometry Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002848 electrochemical method Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001424 field-emission electron microscopy Methods 0.000 description 1
- 238000000445 field-emission scanning electron microscopy Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000010191 image analysis Methods 0.000 description 1
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 1
- 238000001540 jet deposition Methods 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 235000019362 perlite Nutrition 0.000 description 1
- 239000010451 perlite Substances 0.000 description 1
- 238000005240 physical vapour deposition Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000011265 semifinished product Substances 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 238000001771 vacuum deposition Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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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
- C21D8/0236—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
- 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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- C—CHEMISTRY; METALLURGY
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- C22C—ALLOYS
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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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
- 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
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
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- C21D6/002—Heat treatment of ferrous alloys containing Cr
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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
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- C21D8/0273—Final recrystallisation annealing
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- C22C38/00—Ferrous alloys, e.g. steel alloys
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- C22C38/00—Ferrous alloys, e.g. steel alloys
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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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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- 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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Description
LME指数=%C+%Si/4、
式中、%C及び%Siはそれぞれ、鋼中の炭素及びケイ素の重量パーセントを表す。
- 15%~30%の間の残留オーステナイトであって、該残留オーステナイトは少なくとも0.7%の炭素含有率を有するもの、
- 70%~85%の間の焼戻しマルテンサイト、及び
- 最大で5%のフレッシュマルテンサイト、及び
- 最大で5%のベイナイト。
厚さが、例えば、1.8~6mmの間の熱間圧延板は、鋼を鋳造してスラブを得るように上述した組成を有するものである工程、スラブを1150~1300℃の間に含まれる温度Treheatで再加熱する工程、再加熱したスラブを最終圧延温度がAr3より高い温度で熱間圧延し、熱間圧延鋼板を得る工程によって製造することができる。
- 冷間圧延鋼板をAc3~Ac3+100℃の間の焼鈍温度に再加熱し、及び冷間圧延鋼板を該焼鈍温度に30秒~600秒の間に含まれる保持時間保持し、焼鈍終了時に完全オーステナイト組織を得る工程。
焼鈍温度までの再加熱速度は1℃/秒~200℃/秒の間に含まれることが好ましい。
- 冷間圧延鋼板を好ましくは0.1℃/秒~200℃/秒の間に含まれる冷却速度で、(Ms-140℃)~(Ms-75℃)の間、好ましくは150~215℃の間に含まれる焼入れ温度まで焼入れし、1~200秒の間に含まれる保持時間の間該焼入れ温度にそれを維持する工程。
以下の表に試験組成をまとめ、そこで元素含有率を重量%で表す。バナジウムは添加しなかった。
粒界酸化は巻取り板の表面上の不連続性を特徴とする粒間酸化である。鋼表面の鉄層では、酸化物が結晶粒間に分散している。最終的な微細組織の粒界は、母材中の均一な拡散と比較して、鉄よりも酸化性が高い元素についての拡散短絡を自然に構成する。その結果、粒界のレベルでより顕著な酸化及びより深い酸化が起こる。
得られた冷間圧延鋼板の微細組織の相の割合を決定した。
試験した試料の機械的特性を決定し、以下の表にまとめた。
Claims (16)
- 冷間圧延熱処理鋼板であって、重量パーセントで以下:
C:0.3~0.4%
Mn:2.0~2.6%
Si:0.8~1.6%
Al:0.01~0.6%
Mo:0.15~0.5%
Cr:0.3~1.0%
Nb≦0.06%
Ti≦0.06%
Ni≦0.8%
S≦0.010%
P≦0.020%
N≦0.008%
Cu≦0.03%
を含み、及び重量パーセントで、任意に以下:
B:0.0003~0.005%
V≦0.2%
の元素の1種以上を含む組成を有し、前記組成の残余は鉄、及び製錬から生じる不可避の不純物である鋼でできており、前記鋼板が、表面分率で、以下:
- 15~30%の間の残留オーステナイトであって、前記残留オーステナイトが少なくとも0.7%の炭素含有率を有するもの、
- 70%~85%の間の焼戻しマルテンサイト、及び
- 最大で5%のフレッシュマルテンサイト、及び
- 最大で5%のベイナイト
からなる微細組織を有し、
前記冷間圧延熱処理鋼板が、少なくとも1100MPaの降伏強さYS、少なくとも1470MPaの引張強さ、少なくとも13%の全伸びTE、少なくとも15%の穴広げ率HER及び0.70未満のLME指数を有し、ここで、LME指数=%C+%Si/4(式中、%C及び%Siはそれぞれ、鋼中の炭素及びケイ素の重量パーセントを表す。)である、冷間圧延熱処理鋼板。 - クロム含有率が0.6%~0.8%の間に含まれる、請求項1に記載の冷間圧延熱処理鋼板。
- ケイ素含有率が1.5%未満である、請求項1又は2に記載の冷間圧延熱処理鋼板。
- ケイ素含有率が1.4%未満である、請求項1~3のいずれか一項に記載の冷間圧延熱処理鋼板。
- ケイ素含有率が1.3%未満である、請求項1~4のいずれか一項に記載の冷間圧延熱処理鋼板。
- ケイ素及びアルミニウムの累積量が1.6%以上である、請求項1~5のいずれか一項に記載の冷間圧延熱処理鋼板。
- アルミニウム含有率が0.2%~0.5%の間に含まれる、請求項1~6のいずれか一項に記載の冷間圧延熱処理鋼板。
- モリブデン含有率が0.20%~0.40%の間である、請求項1~7のいずれか一項に記載の冷間圧延熱処理鋼板。
- 前記微細組織が、最大で2%のフレッシュマルテンサイトを含む、請求項1~8のいずれか一項に記載の冷間圧延熱処理鋼板。
- 前記微細組織が、最大で2%のベイナイトを含む、請求項1~9のいずれか一項に記載の冷間圧延熱処理鋼板。
- 前記微細組織が、ベイナイトを含まず、及びフレッシュマルテンサイトを含まない、請求項1~10のいずれか一項に記載の冷間圧延熱処理鋼板。
- 前記冷間圧延熱処理鋼板がZn若しくはZn合金、又はAl若しくはAl合金で被覆されている、請求項1~11のいずれか一項に記載の冷間圧延熱処理鋼板。
- 以下の連続工程を含む、請求項1~11に記載の冷間圧延熱処理鋼板の製造方法:
- 鋼を鋳造してスラブを得る工程であって、前記鋼は請求項1~8のいずれか一項に記載の組成を有するものである工程、
- 前記スラブを1150℃~1300℃の間に含まれる温度Treheatで再加熱する工程、
- 前記再加熱されたスラブをAr3より高い温度で熱間圧延し、熱間圧延鋼板を得る工程、
- 前記熱間圧延鋼板を200℃~700℃の間に含まれる巻取り温度Tcoilで巻き取る工程、
- 任意に、前記熱間圧延鋼板を酸洗する工程、
- 任意に、前記熱間圧延鋼板を焼鈍して、熱間圧延焼鈍鋼板を得る工程、
- 任意に、前記熱間圧延焼鈍鋼板を酸洗する工程、
- 前記熱間圧延焼鈍鋼板を冷間圧延して、冷間圧延鋼板を得る工程、
- 前記冷間圧延鋼板をAc3~Ac3+100℃の間の焼鈍温度に再加熱し、及び前記冷間圧延鋼板を前記焼鈍温度で30秒~600秒の間に含まれる保持時間維持し、焼鈍終了時に完全なオーステナイト組織を得る工程、
- 前記冷間圧延鋼板を0.1℃/秒~200℃/秒の間に含まれる冷却速度で(Ms-140℃)~(Ms-75℃)の間に含まれる焼入れ温度Tqまで焼き入れし、及び任意に、それをTqで1~200秒の間に含まれる保持時間Tqの間維持する工程、
- 前記冷間圧延鋼板を350℃~500℃の間に含まれる分配温度に再加熱し、前記冷間圧延鋼板を前記分配温度に30秒~2000秒の間に含まれる分配時間の間維持する工程、
- 前記冷間圧延熱処理鋼板を室温まで冷却する工程。 - 前記巻き取り温度Tcoilが450℃~650℃の間に含まれる、請求項13に記載の方法。
- 巻取り後の前記熱間圧延鋼板が5μmの最大厚さを有する粒界酸化層を含む、請求項13又は14に記載の方法。
- ホットバンドが、500~800℃の間に含まれる温度で1000秒~108000秒間焼鈍される、請求項13~15のいずれか一項に記載の方法。
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PL3899067T3 (pl) | 2024-02-05 |
BR112021006139A2 (pt) | 2021-06-29 |
HUE063790T2 (hu) | 2024-01-28 |
FI3899067T3 (fi) | 2023-11-06 |
KR20210072070A (ko) | 2021-06-16 |
MX2021007215A (es) | 2021-07-07 |
MA54523B1 (fr) | 2023-11-30 |
WO2020128574A1 (en) | 2020-06-25 |
WO2020128811A1 (en) | 2020-06-25 |
KR102548555B1 (ko) | 2023-06-28 |
ZA202101976B (en) | 2022-02-23 |
MA54523A (fr) | 2022-03-30 |
CA3115028A1 (en) | 2020-06-25 |
UA127666C2 (uk) | 2023-11-22 |
US20220017985A1 (en) | 2022-01-20 |
EP3899067B1 (en) | 2023-09-13 |
CN113166828A (zh) | 2021-07-23 |
JP2022510873A (ja) | 2022-01-28 |
ES2966384T3 (es) | 2024-04-22 |
EP3899067A1 (en) | 2021-10-27 |
CN113166828B (zh) | 2023-12-22 |
CA3115028C (en) | 2023-06-27 |
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