IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
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출원번호 |
US-0610224
(2000-07-03)
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우선권정보 |
FR-99 08416(1999-07-01) |
발명자
/ 주소 |
|
출원인 / 주소 |
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대리인 / 주소 |
Oblon, Spivak, McClelland, Maier & Neustadt, P.C.
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인용정보 |
피인용 횟수 :
1 인용 특허 :
2 |
초록
▼
The present invention provides a process for manufacturing a steel strip with low aluminum content, which includes: hot-rolling a steel strip which includes between 0.050 and 0.080% by weight of carbon, between 0.25 and 0.40% by weight of manganese, less than 0.020% by weight of aluminum, and bet
The present invention provides a process for manufacturing a steel strip with low aluminum content, which includes: hot-rolling a steel strip which includes between 0.050 and 0.080% by weight of carbon, between 0.25 and 0.40% by weight of manganese, less than 0.020% by weight of aluminum, and between 0.010 and 0.014% by weight of nitrogen, the remainder being iron and inevitable trace impurities, to form a strip; subjecting the strip to a first cold-rolling, to form a cold-rolled strip; annealing the cold-rolled strip, to form an annealed cold-rolled strip; optionally, subjecting the annealed cold-rolled strip to a secondary cold-rolling; wherein the annealing is a continuous annealing which includes: raising the temperature of the strip to a temperature higher than the temperature of onset of pearlitic transformation Ac 1, holding the strip above this temperature for a duration of longer than 10 seconds, and rapidly cooling the strip to a temperature below 350° C. at a cooling rate in excess of 100° C. per second. Another embodiment of the invention provides a steel strip, produced by the above-mentioned process. Another embodiment of the invention provides a steel sheet with low aluminum content, which includes: between 0.050 and 0.080% by weight of carbon, between 0.25 and 0.40% by weight of manganese, less than 0.020% by weight of aluminum, and between 0.010 and 0.014% by weight of nitrogen, the remainder being iron and inevitable trace impurities, wherein when in an aged condition the sheet includes a percentage elongation A % satisfying the relationship: description="In-line Formulae" end="lead"(750-Rm)/16. 5≦A %≦(850-Rm)/17.5description="In-line Formulae" end="tail" where Rm is the maximum rupture strength of the steel, expressed in Mpa. Another embodiment of the invention provides a container, which includes or is made from the above-mentioned steel sheet.
대표청구항
▼
The invention claimed is: 1. A process for manufacturing a steel strip with low aluminum content, comprising: hot-rolling a steel strip comprising between 0.050 and 0.080% by weight of carbon, between 0.25 and 0.40% by weight of manganese, less than 0.020% by weight of aluminum, and between 0.010 a
The invention claimed is: 1. A process for manufacturing a steel strip with low aluminum content, comprising: hot-rolling a steel strip comprising between 0.050 and 0.080% by weight of carbon, between 0.25 and 0.40% by weight of manganese, less than 0.020% by weight of aluminum, and between 0.010 and 0.014% by weight of nitrogen, the remainder being iron and inevitable trace impurities, to form a strip; subjecting said strip to a first cold-rolling, to form a cold-rolled strip; annealing said cold-rolled strip, to form an annealed cold-rolled strip; and subjecting said annealed cold-rolled strip to a secondary cold-rolling; wherein said annealing is a continuous annealing comprising: raising the temperature of the strip to a temperature equal to or higher than the temperature of onset of pearlitic transformation Ac1, holding the strip above this temperature for a duration of longer than 10 seconds, and rapidly cooling the strip to a temperature below 350° C. at a cooling rate between 100° C. and 500° C. per second. 2. The process according to claim 1, wherein the strip is maintained during said annealing at a temperature between Ac1 and 800° C. for a duration ranging from 10 seconds to 2 minutes. 3. The process according to claim 1, wherein said rapidly cooling is carried out at the cooling rate between 100° C. and 500° C. per second to room temperature. 4. The process according to claim 1, further comprising manufacturing a container with said steel strip. 5. The process according to claim 1, wherein after the secondary cold-rolling and when in an aged condition the steel strip has a ductility A % satisfying the relationship: description="In-line Formulae" end="lead"(750-Rm)/16.5≦A %≦(850-Rm)/17. 5description="In-line Formulae" end="tail" where Rm is the maximum rupture strength of the steel, expressed in MPa.
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