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公开(公告)号：AU2002331433A2
公开(公告)日：2003-04-01
申请号：AU2002331433
申请日：2002-09-13
Applicant: NUCOR CORP
Inventor： STREZOV LAZAR , BLEJDE WALTER , MAHAPATRA RAMA BALLAV
Abstract: A method of producing strip comprising the steps of assembling a pair of casting rolls with a nip between them, introducing between the casting rolls to form a casting pool of molten carbon steel having a total oxygen content of at least 100 ppm and usually less than 250 ppm, counter rotating the casting rolls, solidifying the molten steel on the rolls to form metal shells with levels of oxide inclusions reflected by the total oxygen content of the molten steel, and forming thin steel strip through the nip between the casting rolls from the solidified shells. A unique steel strip may be obtained using the method having ductile properties.
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公开(公告)号：CA2420492A1
公开(公告)日：2002-04-04
申请号：CA2420492
申请日：2001-09-28
Applicant: NUCOR CORP
Inventor： MUKUNTHAN KANNAPPAR , BLEJDE WALTER , STREZOV LAZAR , MAHAPATRA RAMA
IPC: B21B1/00 , B21B1/46 , B22D11/00 , B22D11/06 , B22D11/12 , B22D11/124 , C21D1/00 , C21D1/18 , C21D8/02 , C21D9/573 , C22C38/00 , C22C38/06
Abstract: Steel strips and methods for producing steel strips are provided. In an illustrated embodiment, a method includes continuously casting molten low carbon steel into a strip of no more than 5 mm thickness having austenite grains that are coarse grains of 100-300 micron width; and providing desired yield strength in the cast strip by cooling the strip to transform the austenite grains to ferrite in a temperature range between 850 ~C and 400 ~C at a selected cooling rate of at least 0.01 ~C/sec to produce a microstructu re that provides a strip having a yield strength of at least 200 MPa. The low carbon steel produced desired microstructure.
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公开(公告)号：HRP20040234B1
公开(公告)日：2013-02-28
申请号：HRP20040234
申请日：2004-03-10
Applicant: NUCOR CORP
Inventor： BLEJDE WALTER , MAHAPATRA RAMA BALLAV , STREZOV LAZAR
Abstract: Lijevanje dvostrukim valjcima tanke čelične trake. Rastaljeni čelik se uvodi između jednog para hlađenih ljevačkih valjaka da se oblikuje zaliha taline, iz koje se čelik skrutnjava na valjcima da se proizvede skrutnuta traka. Rastaljeni čelik ima ukupni sadržaj kisika u rasponu od 100 ppm do 250 ppm i sadrži metalne oksidne inkluzije koje sadrže bilo jedan ili više od MnO, SiOi AlO, raspoređene kroz čelik pri gustoći inkluzija u rasponu 2 gm/cmdo 4 gm/cm. Tipično su inkluzije u rasponu veličina između 2 i 12 mikrona. Lijevana traka ima debljinu manju od 5 mm i sadrži skrutnute metalne oksidne inkluzije, raspoređene tako, da područja trake sadrže skrutnute inkluzije gustoće po jedinici površine od barem 120 inkluzija/mm.
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公开(公告)号：CA2421668C
公开(公告)日：2012-02-07
申请号：CA2421668
申请日：2001-09-28
Applicant: NUCOR CORP
Inventor： BLEJDE WALTER , MAHAPATRA RAMA , STREZOV LAZAR , MUKUNTHAN KANNAPPAR
Abstract: A method of controlling a continuous steel strip casting process based on customer-specified requirements includes a general purpose computer in which product specifications of steel product ordered by a customer is entered. The computer is configured to automatically map the product specifications to process parameters/set points for controlling the continuous steel strip casting process in a manner to produce the customer ordered product, and in one embodiment produces a process change report detailing such process parameters/set points for operator use in physically implementing such process parameters/set points in the strip casting process. Alternatively, the computer may provide the process parameters/set points directly to the strip casting process for automatic control thereof in producing the customer ordered steel product. The process of the present invention is capable of substantially reducing the time between a customer request for a steel product and delivery thereof over that of conventional steel manufacturing processes.
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公开(公告)号：AU2008249238B2
公开(公告)日：2011-03-24
申请号：AU2008249238
申请日：2008-11-27
Applicant: NUCOR CORP
Inventor： BLEJDE WALTER , MAHAPATRA RAMA BALLAV , STREZOV LAZAR
Abstract: A method of producing strip comprising the steps of assembling a pair of casting rolls with a nip between them, introducing between the casting rolls to form a casting pool of molten carbon steel having a total oxygen content of at least 100 ppm and usually less than 250 ppm, counter rotating the casting rolls, solidifying the molten steel on the rolls to form metal shells with levels of oxide inclusions reflected by the total oxygen content of the molten steel, and forming thin steel strip through the nip between the casting rolls from the solidified shells. A unique steel strip may be obtained using the method having ductile properties.
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Patent Agency Ranking
公开(公告)号：DE60139491D1
公开(公告)日：2009-09-17
申请号：DE60139491
申请日：2001-09-28
Applicant: NUCOR CORP
Inventor： BLEJDE WALTER , MAHAPATRA RAMA BALLAV , STREZOV LAZAR , MUKUNTHAN KANNAPPAR
IPC: B22D11/06 , B21B1/46 , B21B37/76 , B22D11/00 , B22D11/112 , B22D11/124 , B22D11/22 , C21D1/18 , C21D8/02 , C21D9/46 , C22C38/00 , C22C38/60
Abstract: A plain carbon steel strip is continuously cast in a twin roll caster and passes to a run out table on which it is subjected to accelerated cooling by means of cooling headers whereby it is cooled to transform the strip from austenite to ferrite at a temperature range between 850° C. and 400° C. at a cooling rate of not less than 90° C./sec, such that the strip has a yield strength of greater than 450 MPa. The strip after casting and before cooling is passed through a hot rolling mill to reduce the thickness of strip by at least 15% and up to 50%.
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公开(公告)号：AT438470T
公开(公告)日：2009-08-15
申请号：AT01971506
申请日：2001-09-28
Applicant: NUCOR CORP
Inventor： BLEJDE WALTER , MAHAPATRA RAMA BALLAV , STREZOV LAZAR , MUKUNTHAN KANNAPPAR
IPC: B22D11/06 , B21B1/46 , B21B37/76 , B22D11/00 , B22D11/112 , B22D11/124 , B22D11/22 , C21D1/18 , C21D8/02 , C21D9/46 , C22C38/00 , C22C38/60
Abstract: A plain carbon steel strip is continuously cast in a twin roll caster and passes to a run out table on which it is subjected to accelerated cooling by means of cooling headers whereby it is cooled to transform the strip from austenite to ferrite at a temperature range between 850° C. and 400° C. at a cooling rate of not less than 90° C./sec, such that the strip has a yield strength of greater than 450 MPa. The strip after casting and before cooling is passed through a hot rolling mill to reduce the thickness of strip by at least 15% and up to 50%.
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公开(公告)号：AU2008249238A1
公开(公告)日：2008-12-18
申请号：AU2008249238
申请日：2008-11-27
Applicant: NUCOR CORP
Inventor： BLEJDE WALTER , MAHAPATRA RAMA BALLAV , STREZOV LAZAR
Abstract: A method of producing strip comprising the steps of assembling a pair of casting rolls with a nip between them, introducing between the casting rolls to form a casting pool of molten carbon steel having a total oxygen content of at least 100 ppm and usually less than 250 ppm, counter rotating the casting rolls, solidifying the molten steel on the rolls to form metal shells with levels of oxide inclusions reflected by the total oxygen content of the molten steel, and forming thin steel strip through the nip between the casting rolls from the solidified shells. A unique steel strip may be obtained using the method having ductile properties.
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公开(公告)号：MY134786A
公开(公告)日：2007-12-31
申请号：MYPI20023417
申请日：2002-09-13
Applicant: NUCOR CORP
Inventor： BLEJDE WALTER , MAHAPATRA RAMA BALLAV , STREZOV LAZAR
Abstract: TWIN ROLL CASTING OF THIN STEEL STRIP.MOLTEN STEEL IS INTRODUCED BETWEEN A PAIR OF COOLED CASTING ROLLS TO FORM A CASTING POOL FROM WHICH STEEL SOLIDIFIES ON THE ROLLS TO PRODUCE A SOLIDIFIED STRIP. THE MOLTEN STEEL HAS A TOTAL OXYGEN CONTENT IN THE RANGE 100PPM TO 250PPM AND CONTAINS METAL OXIDE INCLUSIONS COMPRISING ANYONE OR MORE OF MNO, SiO2 AND A12O3 DISTRIBUTED THROUGHOUT THE STEEL AT AN INCLUSION DENSITY IN THE RANGE 2GM/CM3 TO 4GM/CM3. TYPICALLY THE INCLUSIONS RANGE IN SIZE BETWEEN 2 AND 12 MICRONS. THE CAST STRIP HAS A THICKNESS OF LESS THAN 5MM AND CONTAINS SOLIDIFIED METAL OXIDE INCLUSIONS DISTRIBUTED SUCH THAT THE REGIONS OF THE STRIP CONTAIN SOLIDIFIED INCLUSIONS TO A PER UNIT AREA DENSITY OF AT LEAST 120 INCLUSIONS/MM2.(FIG 2)
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公开(公告)号：IS7168A
公开(公告)日：2004-03-03
申请号：IS7168
申请日：2004-03-03
Applicant: NUCOR CORP
Inventor： BLEJDE WALTER , MAHAPATRA RAMA BALLAV , STREZOV LAZAR
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