IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0280914
(1981-07-06)
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발명자
/ 주소 |
- Griffith Cecil B. (North Royalton OH) Thomas Jerry D. (North Olmsted OH) Demianczuk Dionisyj W. (Parma OH) Abraham John K. (Broadview Heights OH) Franklin Joseph E. (Medina OH)
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출원인 / 주소 |
- Republic Steel Corporation (Cleveland OH 02)
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인용정보 |
피인용 횟수 :
1 인용 특허 :
5 |
초록
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High strength, low alloy steel is produced, preferably as a hot rolled article (e.g. strip), to have a rimmed skin of essentially ferrite while having a main body or core which is aluminum-killed and comprises, for superior mechanical properties including yield strength, a suitable quantity of colum
High strength, low alloy steel is produced, preferably as a hot rolled article (e.g. strip), to have a rimmed skin of essentially ferrite while having a main body or core which is aluminum-killed and comprises, for superior mechanical properties including yield strength, a suitable quantity of columbium and/or vanadium. The carbon, manganese and sulfur contents of the base metal, which provides the skin and plus the addition, the core, are preferably limited to provide special results as low alloy steel and also, by the same limitations, to provide auto sulfide shape control and thus to avoid unwanted directionality regarding toughness and bendability. The steel is made by pouring a mold 80-95% full of the base composition, then allowing the steel to rim for several minutes, and after a shell has solidified, continuing to pour while adding Al and Cb or V to the teemed stream, thereby providing an ingot with the above killed core, which can be hot reduced as desired.
대표청구항
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A high strength steel product consisting of hot rolled strip having a thickness of 0.05 to 0.5 inch produced by hot rolling to a deformation of at least 50% and as so produced having a yield strength of at least 50 ksi and bendability, without cracking, of essentially zero inside radius of bend over
A high strength steel product consisting of hot rolled strip having a thickness of 0.05 to 0.5 inch produced by hot rolling to a deformation of at least 50% and as so produced having a yield strength of at least 50 ksi and bendability, without cracking, of essentially zero inside radius of bend over essentially 180°, said product consisting of a skin of rimmed steel which is essentially ferrite and has a thickness of about 0.001 to 0.01 inch, over the principal surface area of the product and beneath said skin a core of aluminum-killed steel, the steel of said skin and core being free of sulfide shape control elements and consisting essentially of 0.03 to 0.06% C, 0.2 to 0.6% Mn, 0.045 max. % P, less than 0.025% S, balance iron and incidental elements, said core also containing the following elements: 0 to 0.20% Ti, 0.02 to 0.2% Al, 0.01 to 0.15% Cb and 0 to 0.20% V. A method of making a hot rolled, high strength, low alloy steel product consisting of hot rolled strip having a thickness of 0.05 to 0.5 inch, comprising pouring an ingot mold 80% to 95% full of molten steel which is free of sulfide shape control elements and consists essentially of 0.03 to 0.06% C, 0.2 to 0.6% Mn, 0.045 max. % P, less than 0.025% S, balance iron and incidental elements, allowing said filling to undergo rimming action while a shell of rimmed steel about one inch to four inches thick solidifies next to the mold surround a still-molten core, and then completing pouring of said molten steel into said ingot mold while adding to the molten steel in the mold, aluminum to provide 0.02 to 0.20% Al in the finished core and thereby to kill said core, and 0.01 to 0.15% Cb and 0 to 0.20% V in the core; and after solidification of the ingot, converting the same by hot rolling, to a hot reduced strip product having a skin of rimmed steel which is essentially ferrite and has a thickness of about 0.001 to 0.01 inch, over the principal surface area of the product, and beneath the skin a core of aluminum-killed steel, said hot rolled strip product having bendability, without cracking, of essentially zero inside radius of bend over essentially 180°.
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