KR102513656B1 - 적어도 100 밀리미터의 두께를 갖는 강 섹션 및 그 제조 방법 - Google Patents
적어도 100 밀리미터의 두께를 갖는 강 섹션 및 그 제조 방법 Download PDFInfo
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Abstract
Description
도 2 는 규칙적으로 이격된 밴드로 배열된 석출물을 나타내는 전자 현미경 사진이다.
Claims (14)
- 적어도 100 mm 의 두께를 갖는 플랜지 부분에 각 측에서 연결된 웹 중앙 부분을 포함하는 강 섹션으로서, 상기 강 섹션은, 중량% 로,
C : 0.06 ~ 0.16 %
Mn : 1.10 ~ 2.00 %
Si : 0.10 ~ 0.40 %
Cu : 0.001 ~ 0.50 %
Ni : 0.001 ~ 0.30 %
Cr : 0.001 ~ 0.50 %
Mo : 0.001 ~ 0.20 %
V : 0.06 ~ 0.12 %
N : 0.0050% ~ 0.0200 %
Al ≤ 0.040 %
P ≤ 0.040 %
S ≤ 0.030 %
그리고 선택적으로, 중량% 로, 다음의 원소들:
Ti < 0.005 %
Nb ≤ 0.05 %
중 하나 이상,
철 및 정교화 (elaboration) 로부터의 불순물인 잔부를 포함하는 조성을 갖고, 상기 강 섹션의 미세조직은 크롬, 망간 및 철로부터 선택된 하나 이상의 금속을 또한 가능하게 포함하는 적어도 1 종의 바나듐 석출물을 함유하고, 상기 석출물은 질화물, 탄화물, 탄질화물 또는 이들의 임의의 조합으로부터 선택되며, 상기 석출물의 70 % 초과가 6 nm 미만의 평균 직경을 갖고,
상기 강 섹션은 mm2 당 적어도 500 개의 석출물의 평균 밀도를 갖는 부분을 함유하는, 강 섹션. - 제 1 항에 있어서,
상기 섹션의 조성은 다음의 관계를 만족시키는 것을 특징으로 하는, 강 섹션:
0.4 ≤ CEV ≤ 0.6
여기서, CEV = C + Mn/6 + ( Cr + Mo + V )/5 + ( Ni + Cu )/15 이다. - 제 1 항에 있어서,
바나듐 대 질소 량의 비율이 2.5 내지 7 인 것을 특징으로 하는, 강 섹션. - 제 1 항 내지 제 3 항 중 어느 한 항에 있어서,
상기 플랜지 부분의 미세조직이, 표면에서부터 코어까지, 템퍼드 마텐자이트 및 가능하게는 베이나이트를 포함하는 경화 구역 및 페라이트 및 펄라이트를 포함하는 코어 구역을 함유하는 것을 특징으로 하는, 강 섹션. - 삭제
- 제 1 항 내지 제 3 항 중 어느 한 항에 있어서,
상기 석출물의 적어도 일부가 규칙적으로 이격된 밴드들로 배치되는 것을 특징으로 하는, 강 섹션. - 제 6 항에 있어서,
상기 규칙적으로 이격된 석출물의 80 % 초과가 3 nm 미만의 평균 직경을 갖는 것을 특징으로 하는, 강 섹션. - 제 6 항에 있어서,
상기 규칙적으로 이격된 석출물은 적어도 바나듐 및 크롬을 함유하는 것을 특징으로 하는, 강 섹션. - 제 4 항에 있어서,
상기 석출물의 적어도 일부가 상기 강 섹션의 코어에 위치된 페라이트 상에 무작위로 분포되는 것을 특징으로 하는, 강 섹션. - 제 9 항에 있어서,
상기 무작위로 분포된 석출물의 80 % 초과가 3.5 내지 6 nm 의 평균 직경을 갖는 것을 특징으로 하는, 강 섹션. - 제 10 항에 있어서,
상기 무작위로 분포된 석출물은 적어도 바나듐, 크롬 및 철을 함유하는 것을 특징으로 하는, 강 섹션. - 제 4 항에 있어서,
상기 석출물은 상기 코어 구역에 위치되는 것을 특징으로 하는, 강 섹션. - 제 1 항 내지 제 3 항 중 어느 한 항에 있어서,
상기 플랜지 부분은 최대 140 mm 의 두께를 갖는 것을 특징으로 하는, 강 섹션. - - 제 1 항 내지 제 3 항 중 어느 한 항에 따른 조성을 갖는 강 반제품을 공급하는 단계,
- 상기 강 반제품을 1000 ℃ 초과의 온도에서 재가열하고 적어도 850°C 의 최종 압연 온도로 열간 압연하여, 열연 강 섹션을 얻는 단계,
- 제품의 전부 또는 일부의 표면층의 마텐자이트 및/또는 베이나이트 켄칭을 생성하도록 상기 열연 강 섹션을 냉각시키는 단계로서, 압연 제품의 켄칭되지 않은 부분은, 마텐자이트 및/또는 베이나이트의 켄칭된 표면층의 자기 템퍼링을 야기하고 후속 냉각 동안 섹션의 코어 부분에서 오스테나이트를 페라이트 및 탄화물로 변태시키는 것을 가능하게 하기에 충분히 높은 온도에 남고, 켄칭 후 제품의 템퍼드 표면의 최대 온도는 450 내지 650 ℃ 인, 상기 열연 강 섹션을 냉각시키는 단계를 포함하는 강 섹션의 제조방법으로서,
상기 강 섹션은 적어도 100 mm 의 두께를 갖는 플랜지 부분에 각 측에서 연결된 웹 중앙 부분을 포함하고,
상기 강 섹션의 미세조직은 크롬, 망간 및 철로부터 선택된 하나 이상의 금속을 또한 가능하게 포함하는 적어도 1 종의 바나듐 석출물을 함유하고, 상기 석출물은 질화물, 탄화물, 탄질화물 또는 이들의 임의의 조합으로부터 선택되며, 상기 석출물의 70 % 초과가 6 nm 미만의 평균 직경을 갖고,
상기 강 섹션은 mm2 당 적어도 500 개의 석출물의 평균 밀도를 갖는 부분을 함유하는, 강 섹션의 제조방법.
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PCT/IB2017/058055 WO2019122949A1 (en) | 2017-12-18 | 2017-12-18 | Steel section having a thickness of at least 100mm and method of manufacturing the same |
PCT/IB2018/059909 WO2019123115A1 (en) | 2017-12-18 | 2018-12-12 | Steel section having a thickness of at least 100mm and method of manufacturing the same |
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