公开(公告)号：WO2007045038A1

公开(公告)日：2007-04-26

申请号：PCT/AU2006/001554

申请日：2006-10-19

Applicant: NUCOR CORPORATION ,  BLUESCOPE STEEL LIMITED ,  ISHIKAWAJIMA-HARIMA HEAVY INDUSTRIES COMPANY LIMITED ,  WILLIAMS, James, Geoffrey ,  BARBARO, Frank ,  RENWICK, Philip, John ,  KAUL, Harold, Roland ,  PHILLIPS, Andrew ,  STREZOV, Lazar ,  BLEDJE, Walter ,  MAHAPATRA, Rama, Ballav ,  KILLMORE, Christopher, Ronald

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

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 ºC 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.

Abstract translation: 具有低奥氏体晶粒粗化温度的钢产品具有小于0.4％的碳，小于0.06％的铝，小于0.01％的钛，小于0.01％的铌和小于0.02％的钒，并且具有含有 硅和铁通过平均粒度小于50纳米的钢微结构分布，并且可以在5和30纳米之间。 钢产品可以具有分布在微结构中的细小氧化物颗粒，其能够限制铁素体再结晶，使应变水平高达至少10.0％，温度高达750℃，保持时间长达20分钟。 钢产品可以通过在铸辊之间引入的钢带的连续铸造来制造，以形成总氧含量通常低于250ppm，游离氧含量20和60的熔融碳钢的铸造池 ppm，反转铸辊。

公开(公告)号：WO2007014439A1

公开(公告)日：2007-02-08

申请号：PCT/AU2006/001117

申请日：2006-08-04

Applicant: NUCOR CORPORATION ,  BLUESCOPE STEEL LIMITED ,  ISHIKAWAJIMA-HARIMA HEAVEY INDUSTRIES COMPANY LIMITED ,  MAHAPATRA, Rama, Ballav ,  BLEJDE, Walter ,  STREZOV, Lazar ,  MUKUNTHAN, Kannappar

Inventor： MAHAPATRA, Rama, Ballav ,  BLEJDE, Walter ,  STREZOV, Lazar ,  MUKUNTHAN, Kannappar

IPC: B22D11/06 ,  B22D11/124 ,  C21D8/02 ,  B21B1/46 ,  B22D11/16 ,  C21D9/46 ,  B22D11/12 ,  B22D11/22 ,  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%.

Abstract translation: 通过在双辊铸造机（11）中连续铸造并冷却以在400℃至850℃的温度范围内将钢带从奥氏体转变成铁素体，制备铸造碳钢带（12） 奥氏体在400℃〜850℃的温度范围内，以大于100℃/秒的冷却速度，不抑制冷却速度，形成小于约1％奥氏体的铸造带，并具有超过10的微结构 （i）多边形铁素体和低温转化产物的混合物，或（ii）主要是低温转化产物，其屈服强度至少为450MPa。 冷却前的铸钢带通过热轧机15，将钢带的厚度减少至少15％，最多达50％。

公开(公告)号：WO2003024644A1

公开(公告)日：2003-03-27

申请号：PCT/AU2002/001257

申请日：2002-09-13

Applicant: NUCOR CORPORATION ,  BLEJDE, Walter ,  MAHAPATRA, Rama, Ballav ,  STREZOV, Lazar

Inventor： BLEJDE, Walter ,  MAHAPATRA, Rama, Ballav ,  STREZOV, Lazar

IPC: B22D11/06

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, SiO 2 and Al 2 O 3 distributed throughout the steel at an inclusion density in the range 2gm/cm 3 to 4gm/cm 3 . 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/mm 2 .

Abstract translation: 双辊铸造薄钢带。 在一对冷却的铸辊之间引入熔融钢，以形成铸造池，钢从该铸造池固化在辊上以产生固化的钢带。 钢水的总氧含量在100ppm至250ppm范围内，并且包含金属氧化物夹杂物，其包含MnO，SiO 2和Al 2 O 3中的一种或多种，​​分布在整个钢中，夹杂物密度为2gm / cm 3至4gm / 厘米<3>。 通常，夹杂物的尺寸范围在2和12微米之间。 铸钢带的厚度小于5mm，并且包含固化的金属氧化物夹杂物，其分布成使得钢带的区域含有至少120个夹杂物/ mm 2的每单位面积密度的固化夹杂物。

公开(公告)号：EP1326723B1

公开(公告)日：2009-09-16

申请号：EP01971500.2

申请日：2001-09-28

Applicant: NUCOR CORPORATION

Inventor： MUKUNTHAN, Kannappar ,  STREZOV, Lazar ,  MAHAPATRA, Rama ,  BLEJDE, Walter

IPC: B22D11/06 ,  C21D8/02 ,  C21D1/00

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：EP1326725B1

公开(公告)日：2009-08-05

申请号：EP01971506.9

申请日：2001-09-28

Applicant: NUCOR CORPORATION

Inventor： BLEJDE, Walter ,  MAHAPATRA, Rama Ballav ,  STREZOV, Lazar ,  MUKUNTHAN, Kannappar

IPC: B22D11/06 ,  B22D11/112 ,  B22D11/124 ,  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%.

公开(公告)号：EP1439926A1

公开(公告)日：2004-07-28

申请号：EP02766948.0

申请日：2002-09-13

Applicant: NUCOR CORPORATION

Inventor： BLEJDE, Walter ,  MAHAPATRA, Rama Ballav ,  STREZOV, Lazar

IPC: B22D11/06

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.

公开(公告)号：EP1326724A1

公开(公告)日：2003-07-16

申请号：EP01971505.1

申请日：2001-09-28

Applicant: NUCOR CORPORATION

Inventor： BLEJDE, Walter ,  MAHAPATRA, Rama ,  STREZOV, Lazar ,  MUKUNTHAN, Kannappar

IPC: B22D11/06

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：EP1439926B1

公开(公告)日：2011-05-18

申请号：EP02766948.0

申请日：2002-09-13

Applicant: NUCOR CORPORATION

Inventor： BLEJDE, Walter ,  MAHAPATRA, Rama Ballav ,  STREZOV, Lazar

IPC: B22D11/06

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.

公开(公告)号：EP1326723B9

公开(公告)日：2010-02-03

申请号：EP01971500.2

申请日：2001-09-28

Applicant: NUCOR CORPORATION

Inventor： MUKUNTHAN, Kannappar ,  STREZOV, Lazar ,  MAHAPATRA, Rama ,  BLEJDE, Walter

IPC: B22D11/06 ,  C21D8/02 ,  C21D1/00

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

公开(公告)号：EP1337362A1

公开(公告)日：2003-08-27

申请号：EP01971503.6

申请日：2001-09-28

Applicant: NUCOR CORPORATION

Inventor： STREZOV, Lazar ,  MUKUNTHAN, Kannappar ,  BLEJDE, Walter ,  Mahapatra, Rama

IPC: B22D11/06 ,  C21D8/02 ,  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°C to 400°C. Cast steel with improved yield strength properties is produced by such method.