High-carbon hot-rolled steel sheet, high-carbon cold-rolled steel sheet, and method of manufacturing the same
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C21D-008/02
C22C-038/04
C22C-038/18
C21D-009/46
C22C-038/02
C22C-038/00
C22C-038/06
출원번호
US-0824154
(2011-09-15)
등록번호
US-9133532
(2015-09-15)
우선권정보
KR-10-2010-0091086 (2010-09-16)
국제출원번호
PCT/KR2011/006812
(2011-09-15)
§371/§102 date
20130315
(20130315)
국제공개번호
WO2012/036483
(2012-03-22)
발명자
/ 주소
Park, Kyong-Su
Shin, Han-Chul
출원인 / 주소
POSCO
대리인 / 주소
The Webb Law Firm
인용정보
피인용 횟수 :
1인용 특허 :
1
초록▼
Provided is a method of manufacturing a high-carbon hot-rolled steel sheet, including the steps of i) preparing high-carbon steel materials comprising C: 0.7 to 0.9%, Si: 0.5% or less, Mn: 0.1 to 1.5%, Cr: 0.5% or less, P: 0.05% or less, and S: 0.03% or less in wt % and remaining Fe and other inevit
Provided is a method of manufacturing a high-carbon hot-rolled steel sheet, including the steps of i) preparing high-carbon steel materials comprising C: 0.7 to 0.9%, Si: 0.5% or less, Mn: 0.1 to 1.5%, Cr: 0.5% or less, P: 0.05% or less, and S: 0.03% or less in wt % and remaining Fe and other inevitable impurities; ii) heating the high-carbon steel materials again and manufacturing a steel sheet by performing hot rolling in an austenite region in which a finishing temperature for the hot rolling is an Ar3 transformation temperature or higher; iii) rapidly cooling the steel sheet at 520 to 620° C. before phase transformation is started in a Run-Out Table (ROT); iv) uniformly maintaining a cooling retention temperature so that the cooled steel sheet is subject to phase transformation in any one temperature between 520 to 620° C.; and v) winding the steel sheet in the cooling retention temperature. Also provided is the high-carbon steel sheet made by the above-described method.
대표청구항▼
1. A method of manufacturing a high-carbon hot-rolled steel sheet, comprising the steps of: preparing a high-carbon steel slab comprising C: 0.7 to 0.9%, Si: 0.5% or less, Mn: 0.1 to 1.5%, Cr: 0.5% or less, P: 0.05% or less, and S: 0.03% or less in wt %, with the remainder being Fe and other inevita
1. A method of manufacturing a high-carbon hot-rolled steel sheet, comprising the steps of: preparing a high-carbon steel slab comprising C: 0.7 to 0.9%, Si: 0.5% or less, Mn: 0.1 to 1.5%, Cr: 0.5% or less, P: 0.05% or less, and S: 0.03% or less in wt %, with the remainder being Fe and other inevitable impurities;hot-rolling the high-carbon steel slab in an austenite region on a hot-rolling mill to form a steel sheet, wherein a finishing temperature for the hot rolling is greater than or equal to the Ar3 transformation temperature;cooling the steel sheet to 520 to 620° C. in a Run-Out Table (ROT) of the hot-rolling mill;uniformly maintaining a cooling retention temperature between 520 to 620° C. during which the steel sheet undergoes a phase transformation; andwinding the steel sheet at the cooling retention temperature,wherein during maintenance of the steel sheet at the cooling retention temperature, an upper part of the steel sheet passing through the run-out table is cooled by air at the same time as a corresponding lower part of the steel sheet passing through the run-out table is cooled by water. 2. The method of claim 1, wherein during cooling, the steel sheet undergoes a phase transformation of 10% or less. 3. The method of claim 2, wherein in the cooling retention temperature is maintained within a temperature range of ±20° C. 4. The method of claim 2, wherein in the cooling retention temperature is maintained within a temperature range of ±5° C. 5. The method of claim 3, wherein during winding, the steel sheet undergoes phase transformation of 70% or more. 6. The method of claim 1, wherein the steel sheet is hot-rolled to a thickness of 1.4 mm to 4.0 mm. 7. The method of claim 1, wherein cooling of the steel sheet is carried out at a cooling rate of 50 to 300° C/sec. 8. The method of claim 1, wherein the steel sheet is maintained at the cooling retention temperature for 5 seconds to 60 seconds. 9. The method of claim 1, wherein one or more processes selected from the group consisting of pickling and oiling, spheroidizing annealing, and primary cold rolling is not performed on the wound steel sheet. 10. The method of claim 1, further comprising a step of cold rolling the steel sheet at a reduction ratio of 70% or more. 11. The method of claim 6, further comprising a step cold rolling the steel sheet at a reduction ratio of 70% or more.
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이 특허에 인용된 특허 (1)
Kranenberg Helmut (Orchard Park NY) Hostetter ; Jr. Richard S. (Bethlehem PA), Method for controlling the temperature of steel during hot-rolling on a continuous hot-rolling mill.
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