公开(公告)号：EP1945392A4

公开(公告)日：2015-12-02

申请号：EP06790405

申请日：2006-10-19

Applicant: NUCOR CORP

Inventor： WILLIAMS JAMES GEOFFREY ,  BARBARO FRANK ,  RENWICK PHILIP JOHN ,  KAUL HAROLD ROLAND ,  PHILLIPS ANDREW ,  STREZOV LAZAR ,  BLEDJE WALTER ,  MAHAPATRA RAMA BALLAV ,  KILLMORE CHRISTOPHER RONALD

IPC: B22D11/06 ,  B22D11/11 ,  B22D11/117 ,  B22D27/20 ,  C21D8/04

CPC classification number: B22D11/001 ,  B22D11/0622 ,  B22D11/117 ,  C21D8/0415 ,  C21D2211/004 ,  C22C38/02 ,  C22C38/04 ,  Y10T428/12993

Abstract: A steel product with a high austenite grain coarsening temperature having less than 0.4% carbon, less than 0.06% aluminium, less than 0.01% titanium, less than 0.01% niobium, and less than 0.02% vanadium by weight, and having fine oxide particles containing silicon and iron distributed through the steel microstructure having an average particle size less than 50 nanometers and may be between 5 and 30 nanometers. The steel product may have fine oxide particles distributed through the microstructure capable of restricting ferrite recrystallisation for strain levels up to at least 10.0%, for temperatures up to 750° C. with holding times up to 20 minutes. The steel product may be made by continuous casting of steel strip introduced between the casting rolls to form a casting pool of molten carbon steel having a total oxygen content of at least 70 ppm usually less than 250 ppm, and a free oxygen content 20 and 60 ppm, counter rotating the casting rolls.

公开(公告)号：EP1326725A4

公开(公告)日：2004-11-03

申请号：EP01971506

申请日：2001-09-28

Applicant: NUCOR CORP

Inventor： BLEJDE WALTER ,  MAHAPATRA RAMA BALLAV ,  STREZOV LAZAR ,  MUKUNTHAN KANNAPPAR

IPC: B21B1/46 ,  B21B37/76 ,  B22D11/00 ,  B22D11/06 ,  B22D11/124 ,  C21D1/18 ,  C21D8/02 ,  C21D9/46 ,  C22C38/00 ,  C22C38/60 ,  B22D11/112 ,  B22D11/22

CPC classification number: B21B1/463 ,  B21B37/76 ,  B21B2201/02 ,  B22D11/0622 ,  B22D11/124 ,  C21D1/18 ,  C21D8/0215 ,  C21D8/0226 ,  C21D8/0263

Abstract: A plain carbon steel strip (12) is continuously cast in a twin roll caster (11) and passes to a run out table 17 on which it is subjected to accelerated cooling by means of cooling headers (18) 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 450MPa. 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%.

Abstract translation: 普通碳钢带连续铸造在双辊铸造机中，并通过冷却集管从而将钢带从奥氏体转变成铁素体，并在两个轧辊之间的温度范围内， 850℃和400℃，冷却速度不低于90℃/秒，使得带材的屈服强度大于450MPa。 铸造后的钢带和冷却前通过热轧机将钢带的厚度减少至少15％和高达50％。

公开(公告)号：EP1326723A4

公开(公告)日：2004-09-08

申请号：EP01971500

申请日：2001-09-28

Applicant: NUCOR CORP

Inventor： MUKUNTHAN KANNAPPAR ,  STREZOV LAZAR ,  MAHAPATRA RAMA ,  BLEJDE WALTER

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

CPC classification number: C21D8/0215 ,  B22D11/0622 ,  B22D11/124 ,  C21D1/18 ,  C21D8/0226 ,  C21D9/573 ,  C22C38/02 ,  C22C38/04

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 DEG C and 400 DEG C at a selected cooling rate of at least 0.01 DEG C/sec to produce a microstructure that provides a strip having a yield strength of at least 200 MPa. The low carbon steel produced desired microstructure.

公开(公告)号：EP1909994A4

公开(公告)日：2009-08-19

申请号：EP06760970

申请日：2006-08-04

Applicant: NUCOR CORP

Inventor： MAHAPATRA RAMA BALLAV ,  BLEJDE WALTER ,  STREZOV LAZAR ,  MUKUNTHAN KANNAPPAR

IPC: B22D11/06 ,  B21B1/46 ,  B22D11/12 ,  B22D11/124 ,  B22D11/16 ,  B22D11/22 ,  C21D8/02 ,  C21D9/46 ,  C22C38/00

CPC classification number: B22D11/0622 ,  B21B1/463 ,  B21B45/0218 ,  B21B45/0233 ,  B22D11/124 ,  C22C38/02 ,  C22C38/04

Abstract: A cast carbon steel strip (12) is prepared by continuously casting in a twin roll caster (11) and cooling to transform the strip from austenite to ferrite at a temperature range between 400°C and 850°C at cooling the strip to transform the austenite to ferrite within a temperature range between 400°C and 850°C at a cooling rate of greater than 100°C/sec without inhibiting the cooling rate to form cast strip that is less than about 1% austenite and has microstructure more than 10% of which exhibits a packet size greater than 300 µm, is either (i) a mixture of polygonal ferrite and low temperature transformation products or (ii) predominantly low temperature transformation products, and has a yield strength of at least 450 MPa. The cast strip before cooling is passed through a hot rolling mill 15 to reduce the thickness of strip by at least 15% and up to 50%.

公开(公告)号：EP1439926A4

公开(公告)日：2004-11-03

申请号：EP02766948

申请日：2002-09-13

Applicant: NUCOR CORP

Inventor： BLEJDE WALTER ,  MAHAPATRA RAMA BALLAV ,  STREZOV LAZAR

IPC: B22D11/06 ,  B22D1/00 ,  B22D11/00 ,  C22C38/00 ,  C22C38/04 ,  C22C38/06

CPC classification number: B22D11/0622 ,  C22C38/02 ,  C22C38/04

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 any one or more of MnO, SiO2 and Al2O3 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.

Abstract translation: 一种生产带材的方法，包括以下步骤：将一对铸辊与它们之间的辊隙组装，在铸辊之间引入以形成总氧含量为至少100ppm且通常小于250的熔融碳钢铸造池 ppm，对铸辊进行反转，使辊上的钢水固化，形成金属壳，氧化物夹杂物水平由钢水的总氧含量反映出来，并通过铸辊之间的辊隙从固化后形成薄钢带 炮弹。 可以使用具有延展性的方法获得独特的钢带。

公开(公告)号：EP1337362A4

公开(公告)日：2004-11-03

申请号：EP01971503

申请日：2001-09-28

Applicant: NUCOR CORP

Inventor： STREZOV LAZAR ,  MUKUNTHAN KANNAPPAR ,  BLEJDE WALTER ,  MAHAPATRA RAMA

IPC: B21B1/46 ,  B22D11/00 ,  B22D11/06 ,  B22D11/12 ,  B22D11/124 ,  B22D11/22 ,  C21D1/18 ,  C21D8/02 ,  C21D9/573 ,  C22C38/00 ,  C22C38/06 ,  C22C38/60 ,  C21D1/00

CPC classification number: B22D11/225 ,  B22D11/0622 ,  C21D1/18 ,  C21D8/0215 ,  C21D8/0226 ,  C21D9/573

Abstract: Steel strips and methods for producing steel strips are provided. In an illustrated embodiment, a method for producing steel strips includes continuously casting molten steel into a strip, said molten steel comprising a concentration of residuals of 2.0 wt% or less is selected with regard to the microstructure of the finished strip to provide a desired yield strength; and cooling the strip to transform the strip from austenite to ferrite in the temperature range of 850 DEG C to 400 DEG C. Cast steel with improved yield strength properties is produced by such method.

Abstract translation: 提供钢条和钢带的生产方法。 在图示的实施例中，钢带的制造方法包括将钢水连续铸造成钢带，对于成品钢带的微结构而言，选择残留量为2.0重量％以下的钢水，以提供所需的产率 强度; 并在850℃至400℃的温度范围内冷却该条带以将该条带从奥氏体转变为铁素体。通过这种方法产生具有改善的屈服强度特性的铸钢。

公开(公告)号：EP1326724A4

公开(公告)日：2004-06-23

申请号：EP01971505

申请日：2001-09-28

Applicant: NUCOR CORP

Inventor： BLEJDE WALTER ,  MAHAPATRA RAMA ,  STREZOV LAZAR ,  MUKUNTHAN KANNAPPAR

IPC: B21B1/00 ,  B21B1/46 ,  B22D11/06 ,  B22D11/12 ,  B22D11/16

CPC classification number: B22D11/0622 ,  B22D11/16

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.

公开(公告)号：UA96580C2

公开(公告)日：2011-11-25

申请号：UAA200806525

申请日：2006-10-19

Applicant: NUCOR CORP

Inventor： WILLIAMS JAMES JEOFFRY ,  BARBARO FRANK ,  RENWIK PHILIP JOHN ,  KAUL HAROLD ROLAND ,  PHILLIPS ANDREW ,  STREZOV LAZAR ,  BLEDGE WALTER ,  MAHAPATRA RAMA BALLAV ,  KILLMORE CHRISTOPHER RONALD

IPC: B22D11/06 ,  B22D11/11 ,  B22D11/117 ,  B22D27/20 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14

Abstract: Стальнойпродуктс высокойтемпературойогрубенияаустенитныхзерен, содержащийпомассеменее 0,4 % углерода, менее 0,06 % алюминия, менее 0,01 % титана, менее 0,01 % ниобияи менее 0,02 % ванадияи имеетраспределенныев микроструктуресталитонкодисперсныеоксидныечастицы, содержащиекремнийи железои имеющиесреднийразмерменее 50 нм, и, возможно, от 5 до 30 нм. Стальнойпродуктможетиметьраспределенныев микроструктуресталитонкодисперсныеоксидныечастицы, пригодныедляограниченияферритнойрекристаллизациидоуровняв 10,0 % притемпературе 750 °C привыдержкев течение 20 минут. Стальнойпродуктможноизготовитьнепрерывнымлитьемстальнойлентымеждулитейнымивалками, вращающимисяв противополо�

公开(公告)号：UA93688C2

公开(公告)日：2011-03-10

申请号：UAA200802538

申请日：2006-08-04

Applicant: NUCOR CORP

Inventor： MAHAPATRA RAMA BALLAV ,  BLEJDE WALTER ,  STREZOV LAZAR ,  MUKUNTHAN KANNAPPAR

IPC: B22D11/00 ,  B21B1/46 ,  C21D8/02 ,  C21D9/46 ,  C22C38/00

Abstract: Литаялента 12 изуглеродистойсталиизготовлена​​непрерывнымлитьемв двухвалковойлитейноймашине 11 иохлаждениемдляпреобразованиялентыизаустенитав ферритпритемпературев интервалемежду 400 °Си 850 °Си скоростиохлажденияболее 100 °С/сбезсниженияскоростиохлаждениядляобразованиялитойленты, содержащейменееприблизительно 1 % аустенитаи имеетмикроструктуру, более 10 % которойхарактеризуетсяразмеромпакетаболее 300 мкми котораяявляетсяили (i) смесьюполигональногоферритаи продуктовнизкотемпературногопревращения, или (ii) преимущественно, продуктаминизкотемпературногопревращения, иимеетпределтекучестинеменее 450 МПа. Литаялентапередохлаждениемпроходитсквозьстангорячейпрокатки 15 дляуменьшенияеетолщиныминимумна 15 % идо 50 %.

公开(公告)号：BR0212499A

公开(公告)日：2004-12-28

申请号：BR0212499

申请日：2002-09-13

Applicant: NUCOR CORP

Inventor： BLEJDE WALTER ,  MAHAPATRA RAMA BALLAV ,  STREZOV LAZAR

IPC: B22D11/06 ,  B22D1/00 ,  B22D11/00 ,  C22C38/00 ,  C22C38/04 ,  C22C38/06

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.