公开(公告)号：US5540753A

公开(公告)日：1996-07-30

申请号：US347925

申请日：1994-12-01

申请人： Hironori Takano ,  Hiroaki Morishige ,  Ryuji Nakao ,  Toshihiro Kosuge

发明人： Hironori Takano ,  Hiroaki Morishige ,  Ryuji Nakao ,  Toshihiro Kosuge

IPC分类号： C21C5/32 ,  C21C5/00 ,  C21C5/35 ,  C21C5/46 ,  C21C7/00 ,  C21C7/068 ,  C21C7/072

CPC分类号： C21C5/005 ,  C21C5/35 ,  C21C5/4606

摘要： The present invention provides a method for refining a molten chromium-containing steel by decarburization according to a combined-blown process, which contributes to an improvement in decarburization rate and realizes efficient decarburization while preventing [Cr] contained in the molten steel from being oxidized. The method is characterized in that, in a region where the [C] concentration of the molten chromium-containing steel is not less than 0.15%, oxygen or a gas mixture of oxygen with an inert gas is blown through a top-blown lance onto the surface of the molten steel under the following conditions:(1) the velocity of the gas immediately after spouting through one or at least two nozzle holes of the top-blown lance is not less than the velocity of sound; and(2) the ratio of the length h of a zone, in the vicinity of the surface of the molten steel, where the gas jet velocity is less than the velocity of sound, to the minimum hole diameter d.sub.0 of said nozzle, h/d.sub.0, is not more than 60, provided that when gas jets blown through a multihole nozzle overlap each other with a degree of overlap .beta., a requirement represented by the formula h/d.sub.0 .times.(1-.beta.).ltoreq.60 is met.

摘要翻译： 本发明提供了一种根据组合吹制方法通过脱碳来精炼含铬的含铬钢的方法，其有助于提高脱碳速率，并且在防止钢水中所含的[Cr]被氧化的同时实现有效的脱碳。 该方法的特征在于，在含有熔融铬的钢的[C]浓度不小于0.15％的区域中，氧气或惰性气体的氧气或气体混合物通过顶吹喷枪吹送到 在以下条件下钢水表面：（1）通过顶吹喷枪的一个或至少两个喷嘴孔喷射后的气体速度不小于声速; 和（2）气体喷射速度小于声速的钢水表面附近的区域长度h与所述喷嘴的最小孔径d0之比h / d0不大于60，条件是当通过多孔喷嘴吹扫的气体喷嘴以重叠度β重叠时，满足由公式h / d0x（1-β）= 60表示的要求。

公开(公告)号：US06830606B2

公开(公告)日：2004-12-14

申请号：US10482560

申请日：2003-12-30

申请人： Ryuji Nakao ,  Tomoaki Tanaka ,  Masao Igarashi ,  Koichiro Yoshino

发明人： Ryuji Nakao ,  Tomoaki Tanaka ,  Masao Igarashi ,  Koichiro Yoshino

IPC分类号： C21C7068

CPC分类号： C21C7/0685 ,  C21B5/001 ,  C21C5/005 ,  C21C5/4673 ,  C21C7/072 ,  C21C7/10 ,  C21C2300/06 ,  Y02P10/286 ,  Y10S706/904

摘要： The present invention: solves the problems of hitherto disclosed technologies, such as insufficient suppression of the oxidation loss of [Cr] and the excessive erosion of refractories, in the decarburization-refining of chromium-contained molten steel under a normal or reduced pressure; and is characterized by: determining, in sequence; a molten steel temperature during the refining through actual measurement or computation from a molten steel temperature before the refining and refining conditions; [C] and [Cr] concentrations during the refining through actual measurement or computation from molten steel components before the refining and refining conditions; a CO partial pressure PCO in an atmosphere during the refining from the total pressure P of the atmosphere, an oxygen gas supply rate and an inert gas supply rate, a Hilty's equilibrium temperature TH from said [C] and [Cr] concentrations and PCO; the difference &Dgr;T between said molten steel temperature during the refining and said Hilty's equilibrium temperature TH: and controlling the refining conditions so that said &Dgr;T is equal to a prescribed value or higher.

摘要翻译： 本发明解决了在正常或减压下含铬钢水的脱碳精炼中迄今为止公开的技术的诸如不充分抑制[Cr]的氧化损失和耐火材料过度侵蚀的技术的问题; 其特征在于：依次确定 精炼过程中的钢水温度在精炼和精炼条件之前由钢水温度进行实际测量或计算; 在精炼过程中，通过在精炼和精炼条件之前从钢水部件进行实际测量或计算，精炼中的[C]和[Cr]浓度; 来自大气的总压力P的精炼期间的气氛中的CO分压PCO，氧气供给速率和惰性气体供给速率，来自所述[C]和[Cr]浓度和PCO的Hilty的平衡温度TH; 在精炼期间的所述钢水温度与所述Hilty的平衡温度TH之间的差ΔTt，并控制精炼条件使得所述ΔT等于或等于规定值以上。

公开(公告)号：US07497987B2

公开(公告)日：2009-03-03

申请号：US11712778

申请日：2007-02-28

申请人： Kosuke Yamashita ,  Ryuji Nakao ,  Tomoaki Tanaka ,  Masao Igarashi ,  Koichiro Yoshino ,  Makoto Sumi

发明人： Kosuke Yamashita ,  Ryuji Nakao ,  Tomoaki Tanaka ,  Masao Igarashi ,  Koichiro Yoshino ,  Makoto Sumi

IPC分类号： C21C7/10

CPC分类号： F27D3/16 ,  C21C5/005 ,  C21C5/30 ,  C21C5/35 ,  C21C7/0685 ,  C21C7/10 ,  F27D3/0025 ,  F27D3/0032 ,  F27D17/001 ,  F27D17/004 ,  F27D2003/164 ,  F27D2003/166 ,  F27D2003/168

摘要： A refining method and apparatus for decarburization refining of chromium containing molten steel in a vessel having a first step of blowing oxygen while the inside of the vessel is at a pressure of between 400 Torr and atmospheric pressure, a second step of blowing oxygen while evacuation the inside of the vessel to 250 to 400 Torr and a third step of blowing gas while evacuating the vessel to not more than 250 Torr. Further, a refining method and apparatus for ultra-low carbon chrome melt by performing a first vacuum refining until the third step, then restoring the pressure in the vessel to at least 400 Torr, then performing second vacuum refining while making the bottom blowing gas blow rate at least 0.4 Nm3 per to steel.

摘要翻译： 一种用于在容器内含铬钢液的脱碳精炼的精炼方法和装置，该容器具有在容器内部处于400托和大气压之间的同时吹氧的第一步骤，第二步是在排出氧气的同时吹氧 容器内至250至400乇，第三步在将容器排空至不超过250乇的同时吹送气体。 此外，通过进行第一次真空精炼直到第三步骤，然后将容器中的压力恢复至至少400托，然后进行第二次真空精炼，同时使底吹气体吹动，进行超低碳铬熔体的精炼方法和装置 每钢至少0.4 Nm3。

公开(公告)号：US20070152386A1

公开(公告)日：2007-07-05

申请号：US11712778

申请日：2007-02-28

申请人： Kosuke Yamashita ,  Ryuji Nakao ,  Tomoaki Tanaka ,  Masao Igarashi ,  Koichiro Yoshino ,  Makoto Sumi

发明人： Kosuke Yamashita ,  Ryuji Nakao ,  Tomoaki Tanaka ,  Masao Igarashi ,  Koichiro Yoshino ,  Makoto Sumi

IPC分类号： C21C7/10

CPC分类号： F27D3/16 ,  C21C5/005 ,  C21C5/30 ,  C21C5/35 ,  C21C7/0685 ,  C21C7/10 ,  F27D3/0025 ,  F27D3/0032 ,  F27D17/001 ,  F27D17/004 ,  F27D2003/164 ,  F27D2003/166 ,  F27D2003/168

摘要： A refining method and refining apparatus, able to shorten the time required for refining and reduce the refining costs in decarburization refining of a chromium-contained molten steel, which refining method for chromium-contained molten steel etc. performing decarburization refining by blowing a gas containing oxygen gas into a chromium-contained molten steel under a vacuum or atmospheric pressure and vacuum, said refining method for a chromium-contained molten steel etc. characterized by having a first step for blowing oxygen gas while making the inside of the vessel a pressure of a range of 400 Torr (53 kPa) to atmospheric pressure, a second step for blowing oxygen gas while evacuating the inside of the vessel to 250 to 400 Torr (33 to 53 kPa), and third step for blowing gas while evacuating the inside of the vessel to not more than 250 Torr (33 kPa). Further, a refining method and refining apparatus for an ultra-low carbon chrome melt characterized by performing a first vacuum refining until the third step, then restoring the pressure in the vessel to at least 400 Torr (53 kPa), then performing second vacuum refining while making the bottom blowing gas blow rate at least 0.4 Nm3/min per ton steel.

摘要翻译： 一种精炼方法和精炼装置，其能够缩短精炼所需的时间并降低含铬钢水的脱碳精炼中的精炼成本，该含铬钢水等的精炼方法通过吹入含有气体的气体进行脱碳精炼 氧气在真空或大气压和真空下进入含铬钢水，所述含铬钢水的精炼方法等，其特征在于具有吹入氧气的第一步骤，同时使容器内部的压力为 400Pa（53kPa）至大气压范围的第二步骤，同时将容器内部抽空至250-400乇（33至53kPa）的第二步骤，同时抽空气体的第三步骤 该容器不超过250乇（33 kPa）。 此外，一种用于超低碳铬熔体的精炼方法和精炼装置，其特征在于进行第一真空精炼直到第三步骤，然后将容器中的压力恢复至至少400乇（53kPa），然后进行第二真空精炼 同时使每小时钢的底吹气体吹送速率至少为0.4Nm 3 / min。