KR101103203B1 - 피로 특성과 신장 플랜지성이 우수한 열연 강판 및 그 제조 방법 - Google Patents
피로 특성과 신장 플랜지성이 우수한 열연 강판 및 그 제조 방법 Download PDFInfo
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- 238000000034 method Methods 0.000 title claims description 34
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- 230000032683 aging Effects 0.000 claims abstract description 10
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- 229910052796 boron Inorganic materials 0.000 claims abstract description 8
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 8
- 229910052721 tungsten Inorganic materials 0.000 claims abstract description 8
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 8
- 229910052726 zirconium Inorganic materials 0.000 claims abstract description 8
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 6
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 6
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 5
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 5
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- 238000005096 rolling process Methods 0.000 claims description 66
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- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 5
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052684 Cerium Inorganic materials 0.000 description 1
- 229910052692 Dysprosium Inorganic materials 0.000 description 1
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- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- C—CHEMISTRY; METALLURGY
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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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- C21D8/0447—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the heat treatment
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Abstract
Description
도 2는 정상 파면부의 SEM 사진을 나타내는 도면이다.
도 3은 이상 파면부의 SEM 사진을 나타내는 도면이다.
도 4는 강판 온도와 마무리 압연 종료부터의 경과 시간의 관계에 있어서, Ti-C 클러스터 및 TiC 석출물이 생성하는 영역을 모식적으로 나타내는 도면이다.
Claims (10)
- 질량%로,
C : 0.015% 이상 0.040% 미만,
Si : 0.05% 미만,
Mn : 0.9% 이상 1.8% 이하,
P : 0.02% 미만,
S : 0.01% 미만,
Al : 0.1% 미만,
N : 0.006% 미만,
및 Ti : 0.05% 이상 0.11% 미만을 함유하고,
잔부가 Fe 및 불가피적 불순물로 이루어지고,
Ti/C = 2.5 이상 3.5 미만이고,
Nb, Zr, V, Cr, Mo, B 및 W를 포함하지 않고,
미크로 조직이 폴리고날 페라이트와 콰지 폴리고날 페라이트의 혼합 조직을 96% 초과 포함하고, 상기 콰지 폴리고날 페라이트는, 결정립의 주위 길이 lq, 그 원 상당 직경을 dq로 하면, 그들의 비(lq/dq)가 lq/dq≥3.5를 만족시키는 결정립으로 이루어지는 페라이트이고,
인장 최고 강도가 520㎫ 이상 또한 720㎫ 미만, 시효 지수 AI가 15㎫ 초과, 구멍 확대율(λ)%와 전체 신장(El)%의 곱이 2350 이상, 피로 한도가 200㎫ 이상이고, 상기 피로 한도는, JIS Z 2275에 따라서 응력 진폭이 일정한 완전 진동 및 굽힘 피로 시험(응력비 R=-1)에 의해 평가되는 반복 수 1×107회에서의 피로 강도의 상한인 것을 특징으로 하는, 피로 특성과 신장 플랜지성이 우수한 열연 강판. - 제1항에 있어서, 질량%로, Cu : 0.01% 이상 1.5% 이하 및 Ni : 0.01% 이상 0.8% 이하 중 어느 1종 또는 2종을 더 함유하는 것을 특징으로 하는, 피로 특성과 신장 플랜지성이 우수한 열연 강판.
- 제1항에 있어서, 질량%로, Ca : 0.0005% 이상 0.005% 이하, REM : 0.0005% 이상 0.05% 이하 중 어느 1종 또는 2종을 함유하는 것을 특징으로 하는, 피로 특성과 신장 플랜지성이 우수한 열연 강판.
- 제1항에 있어서, 도금이 실시되어 있는 것을 특징으로 하는, 피로 특성과 신장 플랜지성이 우수한 열연 강판.
- 질량%로, C : 0.015% 이상 0.040% 미만, Si : 0.05% 미만, Mn : 0.9% 이상 1.8% 이하, P : 0.02% 미만, S : 0.01% 미만, Al : 0.1% 미만, N : 0.006% 미만, 및 Ti : 0.05% 이상 0.11% 미만을 함유하고, 잔부가 Fe 및 불가피적 불순물로 이루어지고, Ti/C=2.5 이상 3.5 미만이고, Nb, Zr, V, Cr, Mo, B 및 W를 포함하지 않는 강편을 1100℃ 이상으로 가열하고, 1000℃ 이상의 온도에서 종료하는 조건으로 조 압연하여 조 바로 하는 공정과,
830 내지 980℃의 온도역에서 종료하는 조건으로 상기 조 바를 마무리 압연하여 압연재로 하는 공정과,
상기 마무리 압연의 종료 후 0.5초 이상 공랭하고, 750 내지 600℃의 온도역을 10 내지 40℃/sec의 범위의 평균 냉각 속도로 냉각하여 열연 강판으로 하는 공정과,
440 내지 560℃에서 상기 열연 강판을 권취하는 공정을 가지고,
미크로 조직이 폴리고날 페라이트와 콰지 폴리고날 페라이트의 혼합 조직을 96% 초과 포함하고, 인장 최고 강도가 520㎫ 이상 또한 720㎫ 미만, 시효 지수 AI가 15㎫ 초과, 구멍 확대율(λ)%와 전체 신장(El)%의 곱이 2350 이상, 및 피로 한도가 200㎫ 이상인 상기 열연 강판을 제조하고,
상기 콰지 폴리고날 페라이트는, 결정립의 주위 길이 lq, 그 원 상당 직경을 dq로 하면, 그들의 비(lq/dq)가 lq/dq≥3.5를 만족시키는 결정립으로 이루어지는 페라이트이고,
상기 피로 한도는, JIS Z 2275에 따라서 응력 진폭이 일정한 완전 진동 및 굽힘 피로 시험(응력비 R=-1)에 의해 평가되는 반복 수 1×107회에서의 피로 강도의 상한인 것을 특징으로 하는, 피로 특성과 신장 플랜지성이 우수한 열연 강판의 제조 방법. - 제5항에 있어서, 상기 조 바를 마무리 압연하는 공정을 개시할 때까지의 동안 및 상기 조 바를 마무리 압연하는 공정 중에서, 어느 한쪽 또는 양쪽에 있어서, 상기 조 바 또는 상기 압연재를 가열하는 것을 특징으로 하는, 피로 특성과 신장 플랜지성이 우수한 열연 강판의 제조 방법.
- 제5항에 있어서, 상기 강편을 조 압연하는 공정의 종료 시점부터 상기 조 바를 마무리 압연하는 공정의 개시 시점까지의 동안에 디스케일링을 행하는 것을 특징으로 하는, 피로 특성과 신장 플랜지성이 우수한 열연 강판의 제조 방법.
- 제5항에 있어서, 상기 열연 강판을 780℃ 이하에서 소둔을 행하는 것을 특징으로 하는, 피로 특성과 신장 플랜지성이 우수한 열연 강판의 제조 방법.
- 제5항에 있어서, 상기 열연 강판을 780℃ 이하에서 가열하고, 이어서 도금욕 중에 침지시켜 강판 표면을 도금하는 것을 특징으로 하는, 피로 특성과 신장 플랜지성이 우수한 열연 강판의 제조 방법.
- 제9항에 있어서, 상기 도금 후, 도금 합금화 처리하는 것을 특징으로 하는, 피로 특성과 신장 플랜지성이 우수한 열연 강판의 제조 방법.
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