JP2020514544A - 最低1100MPaの超高強度と21%の良好な伸びを有する熱間圧延鋼製品 - Google Patents
最低1100MPaの超高強度と21%の良好な伸びを有する熱間圧延鋼製品 Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 120
- 239000010959 steel Substances 0.000 title claims abstract description 120
- 229910001566 austenite Inorganic materials 0.000 claims abstract description 28
- 229910001563 bainite Inorganic materials 0.000 claims abstract description 17
- 229910000734 martensite Inorganic materials 0.000 claims abstract description 12
- 229910052710 silicon Inorganic materials 0.000 claims description 13
- 229910052750 molybdenum Inorganic materials 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- 229910052804 chromium Inorganic materials 0.000 claims description 2
- 238000005482 strain hardening Methods 0.000 claims description 2
- 239000013078 crystal Substances 0.000 claims 1
- 238000005098 hot rolling Methods 0.000 abstract description 13
- 238000005096 rolling process Methods 0.000 abstract description 9
- 239000000203 mixture Substances 0.000 abstract description 5
- 238000005266 casting Methods 0.000 abstract description 4
- 230000007123 defense Effects 0.000 abstract description 2
- 229910001338 liquidmetal Inorganic materials 0.000 abstract 1
- 229910001568 polygonal ferrite Inorganic materials 0.000 abstract 1
- 230000000717 retained effect Effects 0.000 description 17
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 12
- 229910000797 Ultra-high-strength steel Inorganic materials 0.000 description 12
- 239000010703 silicon Substances 0.000 description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 11
- 229910052799 carbon Inorganic materials 0.000 description 11
- 230000015572 biosynthetic process Effects 0.000 description 9
- 238000001816 cooling Methods 0.000 description 7
- 239000010955 niobium Substances 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 229910045601 alloy Inorganic materials 0.000 description 6
- 239000000956 alloy Substances 0.000 description 6
- 239000011651 chromium Substances 0.000 description 6
- 238000011161 development Methods 0.000 description 6
- 239000011572 manganese Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 229910000859 α-Fe Inorganic materials 0.000 description 6
- 238000012545 processing Methods 0.000 description 5
- 238000002791 soaking Methods 0.000 description 4
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 238000002441 X-ray diffraction Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 238000001887 electron backscatter diffraction Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 229910052748 manganese Inorganic materials 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000001000 micrograph Methods 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- 239000011593 sulfur Substances 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000001627 detrimental effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 150000001247 metal acetylides Chemical class 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 229910052758 niobium Inorganic materials 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 229910001562 pearlite Inorganic materials 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 239000003381 stabilizer Substances 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 238000009864 tensile test Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000005246 galvanizing Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000000386 microscopy Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 238000000879 optical micrograph Methods 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
Classifications
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
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- C21D6/00—Heat treatment of ferrous alloys
- C21D6/002—Heat treatment of ferrous alloys containing Cr
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- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
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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
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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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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- 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
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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Abstract
Description
本発明は、少なくとも1100MPaの引張強度と21%以上の伸びを有する高強度熱間圧延鋼製品を開示する。鋼は更に、10〜12%以上の一様伸びと、0.6〜0.7の降伏引張比(yield and tensile ratio)を有する。開発された鋼は更に、19〜23.5GPa%の範囲の引張靱性を有しており、自動車の構造及び耐荷重用途、自動車のバンパー、防衛装備製造、鉱業などの用途に非常に適している。
自動車部門において、燃料消費の削減、ひいては排出物量の低下、及び高水準の安全性の維持には、より強度の高い鋼を使用する必要がある。両ニーズは、高い伸びを有する先進高強度鋼(AHSS)の使用によって満たすことが可能かもしれない。超高強度(UHSS)又はAHSSは、今まで新しいものではない。しかし、UHSSの主要な問題は、伸びに限界があることによる低い成形能力と弱い耐荷重能力である。金属及び合金では、強度と伸びは反対の挙動を示し、従って、より強度の高い鋼又はUHSS鋼が開発されると、極めて当然ながら、伸びも大幅に低下又は減少する。結果として、自動車の様々なパーツへのUHSSの適用範囲は、成形が益々困難になるにつれて限定されていく。従って、UHSS鋼の開発では、高い伸びと成形性が同時に要求される。言及した情勢/状況では、例えばロアサスペンション、長尺横材及びバンパーなどの様々な自動車部品用の、高引張強度と並外れた一様伸び及び全伸びとを併せ持つ熱間圧延超高強度(UHSS)薄鋼板の開発が求められてきた。
従って、本発明の目的は、先行技術の欠点を解消する熱間圧延先進高強度ベイナイト鋼の厚帯製品を提案することである。
発明の好適な実施形態の詳細な説明
本発明は、下記の合金組成を達成するための溶鋼の調製を含む、先進高強度鋼帯の開発方法に関する:
C:0.15〜0.25、Mn:0.8〜2.1、Si:0.4〜1.1、Cr:0.8〜1.5、Al:0.05〜0.3、Mo:0.05〜0.25、Nb:0.018〜0.035、Ti−0.01〜0.1、S−最大0.008、P−最大0.025、N−最大0.005。
本発明によると、合金を誘導炉で溶融し、続いて厚さ70〜80mmのバー又はインゴットの形態に鋳造した。インゴットは、鋼を十分な時間オーステナイトに保持し、続いて温度を低下させてオーステナイトに変形を加えることにより均質化し(homogenize)、鋳造構造を破壊し圧延プロセスに適するように厚さを減少させるために鍛造し、続いて周囲温度に空冷した。均質化した鋼は、熱間圧延のために準備した。熱間圧延に先立ち、1130℃を超える高温で鋼を2〜4時間均熱し、続いて仕上げ圧延温度をオーステナイト域に保った状態で最小10mmの厚さまで熱間圧延し、続いて塩浴又は同種の設備へ、Msを超えるが(bit)Bs未満の所定温度で巻き取りを行い、数時間保持した。次いで、巻き取った鋼サンプルを空気中に移し、周囲温度に冷却した。微細構造及び機械的性質のための試験片は、熱間圧延板から取得した。光学走査型電子顕微鏡及びOIM(Orientation Imaging Microscopy)を使用して、微細構造特性評価を実施した。機械的性質は、ビッカーズ硬度法により評価し、ASTM規格に従い引張試験を遂行した。X線回折を採用して微細構造の構成要素を確認した。
例1に示す開発された鋼は、加熱速度5〜10℃/を用いて1220〜1230℃の温度で均熱した。鋼を冷却し、1080〜1100℃の温度範囲で粗圧延に付し、55〜80%の範囲の変形を加えた。粗圧延鋼を更に冷却し、1000〜1010℃の範囲の仕上げ圧延温度で熱間圧延に付し、55〜70%の変形(deformation)を加えた。鋼仕上げ圧延鋼を5℃/s以上の冷却速度を用いて冷却し、415〜450℃の温度範囲で巻き取った後、室温に空冷した。
Claims (10)
- 少なくとも1100MPaの引張強度と、21%以上の全伸びを有し、重量パーセントで以下:
C:0.12〜0.24;
Mn:0.8〜2.1;
Si:0.4〜1.1;
Cr:0.8〜1.5;
Al−0.05〜0.3;
Mo:0.05〜0.25;
Nb:0.018〜0.035;
Ti−0.01〜0.1;
S−最大0.008
P−最大0.025;及び
N−最大0.005
を含む、超高強度熱間圧延鋼帯又は鋼板。 - Mo、Si、Al、Ti、Crが、好ましくはそれぞれ0.08〜0.12、0.4〜0.8、0.1〜0.29、0.02〜0.04及び0.85〜1.1の範囲で変化する、請求項1に記載の超高強度熱間圧延鋼帯又は鋼板。
- 鋼が、0.6を超えるYS対TSを有する、請求項1に記載の超高強度熱間圧延鋼帯又は鋼板。
- 鋼が、1100〜1150MPaの範囲の引張強度を有する、請求項1に記載の超高強度熱間圧延鋼帯又は鋼板。
- 鋼が、20〜23%の範囲の全伸びを有する、請求項1に記載の超高強度熱間圧延鋼帯又は鋼板。
- 鋼が、10〜12%の範囲の最小一様伸びを有する、請求項1に記載の超高強度熱間圧延鋼帯又は鋼板。
- 鋼が、19〜23.5GPa%の範囲の引張靱性を有する、請求項1に記載の超高強度熱間圧延鋼帯又は鋼板。
- 鋼の歪み硬化指数(「n」)が0.15〜0.19の範囲にある、請求項1に記載の超高強度熱間圧延鋼帯又は鋼板。
- 鋼が、体積で10〜14%のマルテンサイト、85〜80%のベイナイト及び5〜6%のオーステナイトを有する、請求項1に記載の超高強度熱間圧延鋼帯又は鋼板。
- ベイナイトプレートの厚さが500nm未満であり、マルテンサイト結晶粒径が5〜6ミクロン未満である、請求項1に記載の超高強度熱間圧延鋼帯又は鋼板。
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