JP2015525292A - 鋼、平鋼材及び平鋼材の製造方法 - Google Patents
鋼、平鋼材及び平鋼材の製造方法 Download PDFInfo
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- JP2015525292A JP2015525292A JP2015515517A JP2015515517A JP2015525292A JP 2015525292 A JP2015525292 A JP 2015525292A JP 2015515517 A JP2015515517 A JP 2015515517A JP 2015515517 A JP2015515517 A JP 2015515517A JP 2015525292 A JP2015525292 A JP 2015525292A
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- flat steel
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 188
- 239000010959 steel Substances 0.000 title claims abstract description 188
- 239000000463 material Substances 0.000 title claims abstract description 71
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 35
- 239000010936 titanium Substances 0.000 claims abstract description 11
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000012535 impurity Substances 0.000 claims abstract description 10
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 10
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 8
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 8
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000010949 copper Substances 0.000 claims abstract description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000000203 mixture Substances 0.000 claims abstract description 7
- 239000011733 molybdenum Substances 0.000 claims abstract description 7
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910052796 boron Inorganic materials 0.000 claims abstract description 6
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 6
- 229910052802 copper Inorganic materials 0.000 claims abstract description 5
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 5
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims abstract description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 3
- 239000011574 phosphorus Substances 0.000 claims abstract description 3
- 239000011593 sulfur Substances 0.000 claims abstract description 3
- 238000001816 cooling Methods 0.000 claims description 67
- 238000000137 annealing Methods 0.000 claims description 58
- 238000010438 heat treatment Methods 0.000 claims description 39
- 238000000034 method Methods 0.000 claims description 24
- 238000005098 hot rolling Methods 0.000 claims description 19
- 238000005097 cold rolling Methods 0.000 claims description 11
- 229910052748 manganese Inorganic materials 0.000 claims description 11
- 229910052782 aluminium Inorganic materials 0.000 claims description 10
- 229910052804 chromium Inorganic materials 0.000 claims description 9
- 229910052710 silicon Inorganic materials 0.000 claims description 9
- 238000004804 winding Methods 0.000 claims description 9
- 229910052799 carbon Inorganic materials 0.000 claims description 8
- 229910001566 austenite Inorganic materials 0.000 claims description 7
- 229910000734 martensite Inorganic materials 0.000 claims description 7
- 238000005096 rolling process Methods 0.000 claims description 7
- 229910000859 α-Fe Inorganic materials 0.000 claims description 7
- 238000007598 dipping method Methods 0.000 claims description 6
- 229910052758 niobium Inorganic materials 0.000 claims description 6
- 229910001563 bainite Inorganic materials 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 230000000717 retained effect Effects 0.000 claims description 4
- 238000005266 casting Methods 0.000 claims description 2
- 230000001681 protective effect Effects 0.000 claims description 2
- 238000005496 tempering Methods 0.000 claims description 2
- 239000000654 additive Substances 0.000 abstract description 7
- 230000000996 additive effect Effects 0.000 abstract description 7
- 239000010960 cold rolled steel Substances 0.000 description 16
- 239000011701 zinc Substances 0.000 description 15
- 239000011651 chromium Substances 0.000 description 14
- 239000011572 manganese Substances 0.000 description 14
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 12
- 229910052725 zinc Inorganic materials 0.000 description 12
- 230000015572 biosynthetic process Effects 0.000 description 11
- 239000010955 niobium Substances 0.000 description 11
- 230000000694 effects Effects 0.000 description 9
- 238000007747 plating Methods 0.000 description 8
- 230000002411 adverse Effects 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 6
- 238000000576 coating method Methods 0.000 description 6
- 238000005246 galvanizing Methods 0.000 description 6
- 230000001965 increasing effect Effects 0.000 description 6
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- 229910045601 alloy Inorganic materials 0.000 description 5
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- 230000004048 modification Effects 0.000 description 5
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 238000005452 bending Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 229910001562 pearlite Inorganic materials 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 229910001297 Zn alloy Inorganic materials 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000005554 pickling Methods 0.000 description 2
- 230000008092 positive effect Effects 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000000161 steel melt Substances 0.000 description 2
- 229910001335 Galvanized steel Inorganic materials 0.000 description 1
- 229910000794 TRIP steel Inorganic materials 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 229910001039 duplex stainless steel Inorganic materials 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000008397 galvanized steel Substances 0.000 description 1
- 238000005244 galvannealing Methods 0.000 description 1
- 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
- 239000000155 melt Substances 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical group [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229910001568 polygonal ferrite Inorganic materials 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- 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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- C21D6/00—Heat treatment of ferrous alloys
- C21D6/002—Heat treatment of ferrous alloys containing Cr
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- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
Abstract
Description
a)一次産品を形成するために本発明により構成される鋼を鋳造する工程であって、一次産品をスラブ又は薄スラブにすることが可能である、工程と;
b)2〜5.5mmの厚さを有する熱間圧延帯を形成するために前記一次産品を熱間圧延する工程であって、初期熱間圧延温度が1000〜1300℃、特に1050〜1200℃であり、最終熱間圧延温度が840〜950℃、特に890〜950℃である、工程と;
c)480〜610℃の巻取温度で巻取体を形成するために前記熱間圧延帯を巻き取る工程と;
d)0.6〜2.4mmの厚さの冷間圧延平鋼材を形成するために前記熱間圧延帯を冷間圧延する工程であって、前記冷間圧延によって達成される冷間圧延率が40〜80%である、工程と;
e)前記冷間圧延平鋼材が連続的に通過する間に前記冷間圧延平鋼材を焼きなます工程であって、
e.1)最初に予熱段階で、最大870℃の予熱温度まで0.2〜45℃/秒の加熱速度で前記冷間圧延平鋼材を加熱し、
e.2)続いて保持段階で、8〜260秒の焼きなまし期間にわたって750〜870℃の焼きなまし温度で前記冷間圧延平鋼材を保持し、選択的に、保持段階中にそれぞれの焼きなまし温度まで前記予熱された平鋼材を仕上げ加熱し、
e.3)前記焼きなまし期間の終了後に、0.5〜110K/秒の冷却速度で前記冷間圧延平鋼材を冷却する、工程とを含む。
冷間圧延平鋼材(「冷間圧延帯」)は、660〜840℃の予熱温度まで10〜45K/秒の加熱速度で予熱炉で加熱される。
連続炉の入口加熱領域では、冷間圧延平鋼材を最大25K/秒の加熱速度で760〜860℃の目標温度までもっていく。
Rp0.2 少なくとも440MPa、特に最大550MPa、
Rm 少なくとも780MPa、特に最大900MPa、
A80 少なくとも14%、
n10−20/Ag 少なくとも0.10、
BH2、少なくとも25MPa、特に少なくとも30MPa。
−加熱速度RVで予熱温度TVまで加熱する工程と;
−焼きなまし期間tGにわたって最大焼きなまし温度TGで保持する工程であって、前記保持する工程は、予熱温度TVが焼きなまし温度TGより低い場合に(破線TV=TG;実線TV<TG)、焼きなまし温度TGまで仕上げ加熱する工程を含む、工程と;
−1つの段階(図1)又は下記のように2つの段階(図2)で冷却する工程と:
−温度TE(図1)又はTE’(図2)まで平鋼材を冷却する工程と、
−選択的に、それぞれの温度TEが溶融槽の温度TBの温度範囲に落ちる場合、特に温度TB(図1)に等しくなる場合に期間tHにわたって温度TEで保持する工程か、
又は、
−温度TE’が溶融槽の温度範囲の上限より高く、第2の冷却工程で到達した温度TE’’が溶融槽の温度TBの温度範囲に落ちる場合、特に温度TB(図2)に等しくなる場合に、温度TE’から始めて、温度TE’’まで、更に冷却する工程と;
−通過時間tB内で溶融槽の中に平鋼材を通過させる工程と;
−室温RTまで冷却する工程。
−加熱速度RVで予熱期間tV内で予熱温度TVまで予熱する工程と;
−焼きなまし期間tGにわたって最大焼きなまし温度TGで保持する工程であって、前記保持する工程は、予熱温度TVが焼きなまし温度TGより低い場合に(破線TV=TG;実線TV<TG)、焼きなまし温度TGまで仕上げ加熱する工程を含む、工程と;
−2つの段階で冷却する工程であって、第1の段階では中間温度TZ’までより早い冷却速度で冷却し、続いて中間温度TZ’’まで低減した冷却速度で冷却し、前記冷却する工程がtZの冷却期間全体に続く、工程と;
−過時効処理を行う工程であって、前記平鋼材を処理期間tUにわたって冷却速度RUで前記中間温度TZ’’から過時効温度TUまで冷却する、工程と;
−室温RTまで冷却する工程。
Claims (15)
- (重量%で)下記組成を有する鋼であって、
C:0.12−0.18%;
Si:0.05−0.2%;
Mn:1.9−2.2%;
Al:0.2−0.5%;
Cr:0.05−0.2%;
Nb:0.01−0.06%;
残部がFe及び製造関連の理由で不可避な不純物であり、前記不純物がリン、硫黄、窒素、モリブデン、ホウ素、チタン、ニッケル及び銅の成分を含み、前記成分に下記をそれぞれ適用する、
P:≦0.02%
S:≦0.003%
N:≦0.008%
Mo:≦0.1%
B:≦0.0007%
Ti:≦0.01%
Ni:≦0.1%
Cu:≦0.1%
ことを特徴とする鋼。 - 請求項1に記載の鋼において、前記Moの含有量が最大0.05重量%であることを特徴とする鋼。
- 請求項1又は2に記載の鋼において、C、Si、Mn、Al、Cr及びNbの含有量の合計が2.5〜3.5重量%であることを特徴とする鋼。
- 冷間圧延平鋼材であって、請求項1〜3の何れか1項に記載の組成、及び、ベイナイトフェライトを含む50〜90体積%のフェライトと、5〜40体積%のマルテンサイトと、最大15体積%の残留オーステナイトと、製造関連の理由で不可避な最大10体積%の他の構造成分とからなる微細構造を有することを特徴とする平鋼材。
- 請求項4に記載の平鋼材において、残留オーステナイトの含有量が6〜12体積%であることを特徴とする平鋼材。
- 請求項4又は5に記載の平鋼材において、降伏強度Rp0.2が少なくとも440MPaであり、引張強度Rmが少なくとも780MPaであり、破断伸びA80が少なくとも14%であり、n10−20/Agが少なくとも0.1であり、BH2値が少なくとも25MPaであることを特徴とする平鋼材。
- 請求項4〜6の何れか1項に記載するように構成された冷間圧延平鋼材の製造方法であって、
a)一次産品を形成するために請求項1〜3の何れか1項に記載するように構成された鋼を鋳造する工程と;
b)2〜5.5mmの厚さを有する熱間圧延帯を形成するために前記一次産品を熱間圧延する工程であって、初期熱間圧延温度が1000〜1300℃であり、最終熱間圧延温度が840〜950℃である、工程と;
c)480〜610℃の巻取温度で巻取体を形成するために前記熱間圧延帯を巻き取る工程と;
d)0.6〜2.4mmの厚さの冷間圧延平鋼材を形成するために前記熱間圧延帯を冷間圧延する工程であって、前記冷間圧延によって達成される冷間圧延率が40〜80%である、工程と;
e)前記冷間圧延平鋼材を連続的に焼きなます工程であって、
e.1)最初に予熱段階で、最大870℃の予熱温度まで0.2〜45℃/秒の加熱速度で前記冷間圧延平鋼材を加熱し、
e.2)続いて保持段階で、8〜260秒の焼きなまし期間にわたって750〜870℃の焼きなまし温度で前記冷間圧延平鋼材を保持し、選択的に、前記保持段階中にそれぞれの焼きなまし温度まで前記予熱された平鋼材を仕上げ加熱し、
e.3)0.5〜110K/秒の冷却速度で焼きなまし期間の終了後に前記冷間圧延平鋼材を冷却する、工程とを含むことを特徴とする製造方法。 - 請求項7に記載の製造方法において、工程b)の前に、最大500分の加熱期間にわたってそれぞれの初期熱間圧延温度まで前記一次産品を加熱することを特徴とする製造方法。
- 請求項7に記載の製造方法において、工程a)の後に、それぞれの初期熱間圧延温度まで冷却し、その後前記熱間圧延に前記一次産品を直接送ることを特徴とする製造方法。
- 請求項7〜9の何れか1項に記載の製造方法において、前記冷間圧延平鋼材が溶融めっきを通過し、前記溶融めっきが連続フローで工程e.3)から続き、前記冷間圧延平鋼材が工程e.3)で冷却される温度が455〜550℃であることを特徴とする製造方法。
- 請求項7〜9の何れか1項に記載の製造方法において、前記冷間圧延平鋼材を工程e.3)で室温まで冷却することを特徴とする製造方法。
- 請求項11に記載の製造方法において、前記冷間圧延平鋼材を工程e.3)で少なくとも2つの冷却工程で冷却することを特徴とする製造方法。
- 請求項11又は12に記載の製造方法において、前記冷間圧延平鋼材を工程e.3)で250〜500℃まで冷却し、過時効処理(overaging treatment)を行うために、最大760秒間当該温度領域に保持し、続いて前記冷間圧延平鋼材を仕上げ冷却することを特徴とする製造方法。
- 請求項11〜13の何れか1項に記載の製造方法において、室温まで冷却した後、前記冷間圧延平鋼材を電解的に金属保護被膜で覆うことを特徴とする製造方法。
- 請求項7〜13の何れか1項に記載の製造方法において、最後に、前記冷間圧延平鋼材を0.1〜2.0%の調質率で調質圧延することを特徴とする製造方法。
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CN104831177B (zh) * | 2015-05-11 | 2017-11-17 | 首钢总公司 | 一种冷轧热镀锌双相钢及其制备方法 |
KR102058803B1 (ko) | 2015-07-29 | 2019-12-23 | 제이에프이 스틸 가부시키가이샤 | 냉연 강판, 도금 강판 및 이것들의 제조 방법 |
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EP2855717B1 (de) | 2020-01-22 |
US9976205B2 (en) | 2018-05-22 |
JP6310452B2 (ja) | 2018-04-11 |
KR20150023566A (ko) | 2015-03-05 |
KR102073442B1 (ko) | 2020-02-04 |
KR102073441B1 (ko) | 2020-02-04 |
EP2855718B1 (de) | 2019-05-15 |
CN104583424B (zh) | 2017-03-08 |
US20150152533A1 (en) | 2015-06-04 |
EP2855717A1 (de) | 2015-04-08 |
KR20150028267A (ko) | 2015-03-13 |
WO2013182621A1 (de) | 2013-12-12 |
EP2855718A1 (de) | 2015-04-08 |
WO2013182622A1 (de) | 2013-12-12 |
US20150122377A1 (en) | 2015-05-07 |
CN104520448A (zh) | 2015-04-15 |
CN104520448B (zh) | 2017-08-11 |
CN104583424A (zh) | 2015-04-29 |
JP2015525293A (ja) | 2015-09-03 |
JP6374864B2 (ja) | 2018-08-15 |
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