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Применить Всего найдено 9. Отображено 9.
04-09-2015 дата публикации

STEEL SHEET AND MANUFACTURING METHOD THEREOF

Номер: KR1020150101735A
Автор: KANG, UI GU, KANG, DONG HOON, KIM, KYU TAE, PARK, KI JUNG, YOON, DONG HYUN, LEE, TAE HO
Принадлежит:

Disclosed are steel sheet and a manufacturing method thereof, wherein high strength and high ductility can be ensured by adjusting a texture fraction of tempered martensite and tempered bainite via an introduction of a direct quenching and tempering (DQT) process. According to the present invention, the method to manufacture a steel sheet comprises the steps of: (a) conducting, at a finish rolling temperature of 900-950°C, the finish hot rolling of a slab sheet composed of 0.10-0.13 wt% of C, 0.2-0.3 wt% of Si, 0.7-0.9 wt% of Mn, 0.02 wt% or less of P, 0.005 wt% or less of S, 0.03-0.07 wt% of Al, 0.4-0.5 wt% of Cr, 0.9-1.0 wt% of Ni, 0.4-0.5 wt% of Mo, 0.15-0.25 wt% of Cu, 0.02 wt% or less of Ti, 0.035-0.045 wt% of V, 0.0005-0.0030 wt% of B, and the remainder consisting of Fe and inevitable impurities; (b) cooling the hot rolled sheet to a temperature of 250-300°C by conducting direct quenching (DQ); and (c) tempering the cooled sheet at a temperature of 630-700°C. COPYRIGHT KIPO 2015 ( ...

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Номер записи: 1
22-04-2016 дата публикации

STEEL SHEET AND METHOD OF MANUFACTURING THE SAME

Номер: KR0101615029B1
Автор: 윤동현, 강동훈, 김규태, 강의구
Принадлежит: 현대제철 주식회사

... 합금 성분 조절 및 공정 조건 제어를 통하여, 강도 및 저온 DWTT 특성이 우수한 강판 및 그 제조 방법에 대하여 개시한다. 본 발명에 따른 강판 제조 방법은 중량%로, C : 0.03 ~ 0.06%, Si : 0.2 ~ 0.3%, Mn : 1.1 ~ 1.3%, P : 0 초과 0.08 이하, S : 0 초과 0.0008% 이하, Al : 0.02 ~ 0.05%, Cu : 0.2 ~ 0.3%, Nb : 0.04 ~ 0.05%, Ni : 0.2 ~ 0.3%, Cr : 0.15 ~ 0.25%, Mo : 0.1 ~ 0.2%, Ti : 0.005 ~ 0.015%, V : 0.045 ~ 0.055%, Ca : 0.001 ~ 0.004% 및 나머지 Fe와 불가피한 불순물로 이루어지는 슬라브 판재를 1100℃ 이상에서 재가열하는 단계; 재가열된 판재를 오스테나이트 재결정영역에서 1차 압연하는 단계; 1차 압연된 판재를 오스테나이트 미재결정영역에서 2차 압연하는 단계; 및 2차 압연된 판재를 450 ~ 500℃까지 냉각하는 단계;를 포함하고, 상기 1차 압연 및 2차 압연은 각각 복수의 압연패스에서 수행되며, 1차 압연이 실시되는 복수의 압연패스 중 마지막 2개의 압연패스에서 또는 2차 압연이 실시되는 복수의 압연패스 중 최초 2개의 압연패스에서 강압하가 수행되는 것을 특징으로 한다.

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Номер записи: 2
26-11-2015 дата публикации

STEEL FOR PRESSURE VESSEL AND METHOD OF MANUFACTURING THE SAME

Номер: KR0101572354B1
Автор: 이태호, 박기정, 강동훈, 강의구, 김규태
Принадлежит: 현대제철 주식회사

... 합금 성분 조절 및 공정 조건 제어를 통하여 판 형상 불량을 최소화하여 우수한 평탄도를 확보하여 생산성을 향상시킬 수 있는 압력용기 강재 및 그 제조 방법에 대하여 개시한다. 본 발명에 따른 압력용기 강재 제조 방법은 (a) 중량%로, C : 0.10 ~ 0.14%, Si : 0.3 ~ 0.4%, Mn : 1.3 ~ 1.5%, P : 0.012% 이하, S : 0.003% 이하, S_Al : 0.001 ~ 0.060%, Cr : 0.1 ~ 0.2%, Mo : 0.04 ~ 0.08%, N : 0.006% 이하, H : 0.00025% 이하 및 나머지 철(Fe)과 불가피한 불순물로 이루어지는 강 슬라브를 SRT(Slab Reheating Temperature) : 1050 ~ 1250℃로 재가열하는 단계; (b) 상기 재가열된 강 슬라브를 FRT(Finish Rolling Temperature) : 970 ~ 990℃ 조건으로 마무리 열간압연하는 단계; 및 (c) 상기 열간압연된 강을 런아웃테이블로 진입시켜 SCT(Start Cooling Temperature) : 890 ~ 910℃ 및 FCT(Finish Cooling Temperature) : 65 ~ 70℃ 조건으로 냉각하는 단계;를 포함하는 것을 특징으로 한다.

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Номер записи: 3
12-02-2016 дата публикации

STEEL SHEET AND MANUFACTURING METHOD THEREOF

Номер: KR1020160014998A
Автор: KANG, UI GU, KANG, DONG HOON, KIM, KYU TAE, PARK, KI JUNG, YOON, DONG HYUN, LEE, TAE HO
Принадлежит:

Disclosed are steel sheet with high strength and high toughness of which a tensile strength is 760-895 MPa; and a manufacturing method thereof. According to the present invention, the steel sheet comprises: 0.05-0.07 wt% of C; 0.2-0.3 wt% of Si; 1.4-1.6 wt% of Mn; 0.01 wt% or less of P; 0.001 wt% or less of S; 0.01-0.04 wt% of S_Al; 0.05-0.15 wt% of Cu; 0.055-0.065 wt% of Nb; 0.1 wt% or less of Ni; 0.1-0.2 wt% of Cr; 0.15-0.25 wt% of Mo; 0.01-0.02 wt% of Ti; 0.0005-0.0015 wt% of B; 0.005 wt% or less of N; 0.002 wt% or less of O; and the remainder consisting of Fe and inevitable impurities. The steel sheet is characterized by a fact that the final fine structure includes a composite structure having acicular ferrite, lath bainite, and martensite austenite constituent. COPYRIGHT KIPO 2016 ...

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Номер записи: 4
04-07-2018 дата публикации

STEEL MATERIAL AND MANUFACTURING METHOD THEREOF

Номер: KR1020180074842A
Автор: KANG, UI GU, KANG, DONG HOON, KIM, MIN SOO, YOON, DONG HYUN, LEE, HEE WOONG
Принадлежит:

The present invention provides a steel material with improved toughness and a manufacturing method thereof. According to one embodiment of the present invention, the steel material comprises: 0.04 to 0.06 weight percent of C; 0.2 to 0.3 weight percent of Si; 1.6 to 1.8 weight percent of Mn; greater than 0 to 0.012 weight percent or less of P; greater than 0 to 0.003 weight percent or less of S; 0.01 to 0.02 weight percent of La; 0.02 to 0.05 weight percent of soluble Al; 0.005 to 0.015 weight percent of Ti; 0.025 to 0.035 weight percent of Nb; and the remainder being Fe and unavoidable impurities. The maximum particle size of a precipitate of a carbon nitride, containing Nb or Ti, included in a structure is 20 to 40 nm. COPYRIGHT KIPO 2018 ...

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Номер записи: 5
05-04-2016 дата публикации

STEEL SHEET AND METHOD TO MANUFACTURE SAME

Номер: KR1020160036991A
Автор: YOON, DONG HYUN, KANG, DONG HOON, KIM, KYU TAE, KANG, UI GU
Принадлежит:

The present invention relates to a steel sheet having superior strength and low temperature DWTT property; and a method to manufacture the same by adjusting alloy compositions and controlling process conditions. According to the present invention, the method to manufacture the steel sheet comprises: reheating a slab sheet including 0.03-0.06 wt% of C, 0.2-0.3 wt% of Si, 1.1-1.3 wt% of Mn, 0.08 wt% or less of P, 0.0008 wt% or less of S, 0.02-0.05 wt% of Al, 0.2-0.3 wt% of Cu, 0.04-0.05 wt% of Nb, 0.2-0.3 wt% of Ni, 0.15-0.25 wt% of Cr, 0.1-0.2 wt% of Mo, 0.005-0.015 wt% of Ti, 0.045-0.055 wt% of V, 0.001-0.004 wt% of Ca, and the remaining consisting of Fe and inevitable impurities at a temperature of 1100°C or higher; a first rolling step of the reheated sheet at an austenite recrystallization range; a second rolling step of the first rolled sheet at an austenite non-recrystallization range; and cooling the second rolled sheet to a temperature of 450-500°C, wherein the first and the second ...

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Номер записи: 6
06-11-2015 дата публикации

HIGH-STRENGTH STEEL SHEET AND MANUFACTURING METHOD THEREOF

Номер: KR1020150124810A
Автор: YOON, DONG HYUN, KANG, DONG HOON, KANG, UI GU, KIM, KYU TAE
Принадлежит:

Disclosed are a high-strength steel sheet having excellent resistance to hydrogen-induced cracking and a manufacturing method thereof. The method for manufacturing a high-strength steel sheet according to the present invention comprises the steps of: (a) reheating, at temperatures of 1150-1190°C, a slab plate composed of 0.09-0.115 wt% of carbon (C), 0.3-0.4 wt% of silicon (Si), 1.1-1.2 wt% of manganese (Mn), 0.01 wt% or less of phosphorus (P), 0.001 wt% or less of sulfur (S), 0.02-0.05 wt% of aluminum (Al), 0.1-0.3 wt% of nickel (Ni), 0.1-0.2 wt% of copper (Cu), 0.1-0.2 wt% of chromium (Cr), 0.04-0.05 wt% of niobium (Nb), 0.025-0.035 wt% of vanadium (V), 0.001-0.004 wt% of calcium (Ca), 0.004 wt% or less of nitrogen (N) and the remainder consisting of iron (Fe) and inevitable impurities; (b) hot-rolling the reheated plate at finish rolling temperature of 930-970°C; (c) cooling the hot-rolled plate; and (d) normalizing the cooled plate at temperatures of 880-900°C. COPYRIGHT KIPO 2016 ( ...

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Номер записи: 7
13-12-2017 дата публикации

STEEL MATERIAL FOR PRESSURE VESSEL AND MANUFACTURING METHOD THEREOF

Номер: KR101797369B1
Автор: KANG, UI GU, KANG, DONG HOON, KIM, MIN SOO, YOON, DONG HYUN, LEE, HEE WOONG
Принадлежит: HYUNDAI STEEL COMPANY

The present invention relates to a steel material for a pressure vessel, with limited degradation of strength and impact toughness after post weld heat treatment (PWHT); and a manufacturing method thereof. According to one embodiment of the present invention, the steel material comprises: 0.10 to 0.15 wt% of carbon (C); 2.5 to 3.5 wt% of silicon (Si); 1.20 to 1.60 wt% of manganese (Mn); greater than 0 to 0.01 or less wt% of phosphorus (P); greater than 0 to 0.001 or less phosphorus of sulfur (S); 0.01 to 0.04 wt% of aluminum (Al); 0.10 to 0.20 wt% of chromium (Cr); 0.05 to 0.15 wt% of copper (Cu); greater than 0 to 0.20 or less wt% of nickel (Ni); 0.01 to 0.02 wt% of titanium (Ti); greater than 0 to 0.001 or less wt% of niobium (Nb); greater than 0 to 0.10 or less wt% of molybdenum (Mo); greater than 0 to 0.01 or less wt% of vanadium (V); and balance iron (Fe) and other unavoidable impurities. COPYRIGHT KIPO 2018 (AA) Start (BB) End (S110) Slab reheating (S120) Hot-rolling (S130) Heat treatment ...

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Номер записи: 8
06-11-2015 дата публикации

STEEL SHEET FOR LINE PIPE AND MANUFACTURING METHOD THEREOF

Номер: KR1020150124811A
Автор: KIM, KYU TAE, KANG, DONG HOON, KANG, UI GU, YOON, DONG HYUN
Принадлежит:

Disclosed are a steel sheet for a line pipe having excellent resistance to hydrogen-induced cracking by inhibiting a band structure and refining grains via the adjustment of alloy components and the control of process conditions; and a manufacturing method thereof. The steel sheet for a line pipe according to the present invention is composed of: 0.04-0.07 wt% of C; 0.1-0.3 wt% of Si; 1.0-1.2 wt% of Mn; 0.01 wt% or less of P; 0.001 wt% or less of S; 0.01-0.05 wt% of S_Al; 0.01-0.02 wt% of Nb; 0.01-0.02 wt% of Ti; 0.001-0.004 wt% of Ca; a remaining amount of Fe; and other inevitable impurities, wherein the final microstructure has the composite grains including polygonal ferrite and pearlite, and the polygonal ferrite grains account for 85% or greater in terms of a section area ratio. COPYRIGHT KIPO 2016 ...

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Номер записи: 9