WO2022065797A1 - 연신율이 우수한 고강도 후물 열연강판 및 그 제조방법 - Google Patents
연신율이 우수한 고강도 후물 열연강판 및 그 제조방법 Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 99
- 239000010959 steel Substances 0.000 title claims abstract description 99
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims abstract description 18
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 37
- 229910001562 pearlite Inorganic materials 0.000 claims abstract description 27
- 229910001563 bainite Inorganic materials 0.000 claims abstract description 17
- 229910001568 polygonal ferrite Inorganic materials 0.000 claims abstract description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000000470 constituent Substances 0.000 claims abstract description 9
- 239000012535 impurity Substances 0.000 claims abstract description 8
- 229910052742 iron Inorganic materials 0.000 claims abstract description 5
- 238000001816 cooling Methods 0.000 claims description 69
- 238000005098 hot rolling Methods 0.000 claims description 40
- 229910052799 carbon Inorganic materials 0.000 claims description 20
- 229910052748 manganese Inorganic materials 0.000 claims description 20
- 229910052710 silicon Inorganic materials 0.000 claims description 19
- 229910052719 titanium Inorganic materials 0.000 claims description 19
- 229910052758 niobium Inorganic materials 0.000 claims description 18
- 229910045601 alloy Inorganic materials 0.000 claims description 13
- 239000000956 alloy Substances 0.000 claims description 13
- 229910052698 phosphorus Inorganic materials 0.000 claims description 13
- 238000005096 rolling process Methods 0.000 claims description 12
- 229910052717 sulfur Inorganic materials 0.000 claims description 12
- 229910052804 chromium Inorganic materials 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 238000003303 reheating Methods 0.000 claims description 5
- 238000004804 winding Methods 0.000 claims description 5
- 230000001050 lubricating effect Effects 0.000 claims description 3
- 238000005554 pickling Methods 0.000 claims description 3
- 230000000052 comparative effect Effects 0.000 description 20
- 230000000694 effects Effects 0.000 description 20
- 230000015572 biosynthetic process Effects 0.000 description 16
- 239000002344 surface layer Substances 0.000 description 15
- 230000009466 transformation Effects 0.000 description 13
- 239000000463 material Substances 0.000 description 12
- 238000005728 strengthening Methods 0.000 description 12
- 238000005204 segregation Methods 0.000 description 11
- 239000002244 precipitate Substances 0.000 description 10
- 230000001965 increasing effect Effects 0.000 description 9
- 239000000203 mixture Substances 0.000 description 9
- 238000009826 distribution Methods 0.000 description 8
- 238000001953 recrystallisation Methods 0.000 description 8
- 229910000734 martensite Inorganic materials 0.000 description 7
- 150000001247 metal acetylides Chemical class 0.000 description 6
- 238000001556 precipitation Methods 0.000 description 6
- 239000006104 solid solution Substances 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 4
- 229910001566 austenite Inorganic materials 0.000 description 4
- 238000005266 casting Methods 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- 241000219307 Atriplex rosea Species 0.000 description 1
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007542 hardness measurement Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 235000019362 perlite Nutrition 0.000 description 1
- 239000010451 perlite Substances 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
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Abstract
Description
Claims (6)
- 중량%로, C:0.05∼0.15%, Si:0.01∼1.0%, Mn:1.0∼2.0%, Sol. Al:0.01∼0.1%, Cr:0.005~1.0%, P:0.001∼0.02%, S:0.001∼0.01%, N:0.001∼0.01%, Nb:0.005~0.07%, Ti:0.005~0.11%, 잔부 철 및 불가피한 불순물을 포함하고, 하기 [관계식 1]을 만족하며,면적%로, 폴리고날 페라이트: 25~50%, 베이니틱 페라이트+침상 페라이트: 30~50%, 베이나이트: 20% 이하, 단위면적(1cm2)내 관찰되는 직경 0.5㎛ 이상의 탄화물 및 펄라이트 조직의 면적분율의 합: 5% 미만, 그리고 MA상(Martensitic-austenitic constituents): 5% 미만을 포함하는 미세조직을 갖는, 두께 10~14mm의 인장강도 590MPa급 이상이고 연신율 30% 이상의 고강도 후물 열연강판.[관계식 1]0.3 ≤ R ≤ 1.0R = [C]* + 0.7×[Mn] + 8.5×[P] + 7.5×[S] - 0.9×[Si] - 1.5×[Nb][C]* = [C] - [C] × QQ = ([Nb]/93+[Ti]/48)/([C]/12)상기 관계식(1)의 C, Mn, P, S, Si, Nb, Ti은 해당 합금원소의 중량%
- 제 1항에 있어서, 상기 열연강판은 El × TS × 0.5Hvmax /ΔH값이 140,000 이상을 만족하는 것을 특징으로 하는 두께 10~14mm의 인장강도 590MPa급 이상이고 연신율 30% 이상의 고강도 후물 열연강판.
- 중량%로, C:0.05∼0.15%, Si:0.01∼1.0%, Mn:1.0∼2.0%, Sol. Al:0.01∼0.1%, Cr:0.005~1.0%, P:0.001∼0.02%, S:0.001∼0.01%, N:0.001∼0.01%, Nb:0.005~0.07%, Ti:0.005~0.11%, 잔부 철 및 불가피한 불순물을 포함하고, 하기 [관계식 1]을 만족하는 강 슬라브를 1200~1350℃로 재가열하는 단계;상기 재가열된 강 슬라브를 하기 [관계식 2]를 만족하는 온도범위에서 마무리 열간압연하는 단계;상기 마무리 열간압연된 강판을 450~550℃의 범위의 온도까지 하기 [관계식 3]을 만족하는 냉각속도로 냉각한 후, 400~550℃의 범위의 온도에서 권취하는 단계; 및상기 권취된 강판을 상온~200℃의 범위의 온도까지 공냉 또는 수냉하는 단계를 포함하는, 두께 10~14mm의 인장강도 590MPa급 이상이고 연신율 30% 이상의 고강도 후물 열연강판 제조방법.[관계식 1]0.3 ≤ R ≤ 1.0R = [C]* + 0.7×[Mn] + 8.5×[P] + 7.5×[S] - 0.9×[Si] - 1.5×[Nb][C]* = [C] - [C] × QQ = ([Nb]/93+[Ti]/48)/([C]/12)상기 관계식 1의 C, Mn, P, S, Si, Nb, Ti은 해당 합금원소의 중량%[관계식 2]Tn-70 ≤ FDT ≤ TnTn = 750 + 92×[C] + 70×[Mn] + 45×[Cr] + 647×[Nb] + 515×[Ti] - 50×[Si] - 2.4×(t-5)상기 관계식 2의 C, Mn, Cr, Nb, Ti, Si은 해당 합금원소의 중량%상기 관계식 2의 FDT는 열간압연 종료시점의 열연판의 온도 (℃)상기 관계식 2의 t는 최종 압연판재의 두께 (mm)[관계식 3]CRMin ≤ CR* ≤ 60CRMin = 65 - 157×[C] - 25.2×[Si] - 14.1×[Mn] - 27.3×[Cr] + 61×[Ti] + 448×[Nb] + 1.4×(t-5)상기 관계식 3의 C, Si, Mn, Cr, Ti, Nb은 해당 합금원소의 중량%상기 관계식 3의 CR*는 열연후 압연된 판재의 냉각시 냉각속도(℃/sec)
- 제 3항에 있어서, 상기 공냉 또는 수냉한 후, 강판을 산세 및 도유하는 단계를 더 포함하는 것을 특징으로 하는 두께 10~14mm의 인장강도 590MPa급 이상이고 연신율 30% 이상의 고강도 후물 열연강판 제조방법.
- 제 3항에 있어서, 상기 열연강판은, 면적%로, 폴리고날 페라이트: 25~50%, 베이니틱 페라이트+침상 페라이트: 30~50%, 베이나이트: 20% 이하, 단위면적(1cm2)내 관찰되는 직경 0.5㎛ 이상의 탄화물 및 펄라이트 조직의 면적분율의 합: 5% 미만, 그리고 MA상(Martensitic-austenitic constituents): 5% 미만을 포함하는 미세조직을 가지며, 그리고 El × TS × 0.5Hvmax /ΔH값이 140,000 이상을 만족하는 것을 특징으로 하는 두께 10~14mm의 인장강도 590MPa급 이상이고 연신율 30% 이상의 고강도 후물 열연강판 제조방법.
- 제 3항에 있어서, 상기 마무리 열간압연 온도범위내에서 압하량을 10~60%로 제어하는 것을 특징으로 하는 두께 10~14mm의 인장강도 590MPa급 이상이고 연신율 30% 이상의 고강도 후물 열연강판 제조방법.
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