公开(公告)号：US4955126A

公开(公告)日：1990-09-11

申请号：US341142

申请日：1989-04-20

申请人： Masaru Shibata ,  Masayuki Onishi ,  Hitoshi Ohsugi ,  Shigeru Ogura ,  Masaru Washio ,  Hideo Kuguminato ,  Yoshiaki Hara

发明人： Masaru Shibata ,  Masayuki Onishi ,  Hitoshi Ohsugi ,  Shigeru Ogura ,  Masaru Washio ,  Hideo Kuguminato ,  Yoshiaki Hara

IPC分类号： B21B1/02 ,  B21B1/22 ,  B22D11/126 ,  B23K7/00 ,  B24B27/033

CPC分类号： B22D11/126 ,  B23K7/003 ,  B24B27/033 ,  Y10T29/49989

摘要： A process for fusing a steel slab in a longitudinal direction thereof is disclosed, wherein when the steel slab is fused in the longitudinal direction at more than 500.degree. C. and at a speed of more than 300 mm/min., a surface portion of the slab including at least a lower portion of a longitudinally fused surface portion thereof is mechanically removed by cutting or grinding.

摘要翻译： 公开了一种将钢坯沿其长度方向熔融的方法，其中当钢坯沿纵向熔融在大于500℃并以大于300mm / min的速度时，表面部分 包括其纵向熔融表面部分的至少下部的板坯通过切割或研磨被机械地去除。

公开(公告)号：US5152831A

公开(公告)日：1992-10-06

申请号：US767984

申请日：1991-09-30

申请人： Koji Yamaguchi ,  Yasuo Kishimoto ,  Toshikazu Sakuraya ,  Masaru Washio ,  Kazuhisa Hamagami ,  Hiroshi Nishikawa

发明人： Koji Yamaguchi ,  Yasuo Kishimoto ,  Toshikazu Sakuraya ,  Masaru Washio ,  Kazuhisa Hamagami ,  Hiroshi Nishikawa

IPC分类号： C21C7/10

CPC分类号： C21C7/10

摘要： A method of producing an ultra-low-carbon steel by using a vacuum degasser on a molten steel has the steps of conducting vacuum decarburization to attain a predetermined level of carbon content, e.g., 25 ppm or below, in the molten steel while progressively reducing the pressure in said vacuum degasser, conducting addition of hydrogen in which hydrogen is dissolved in said molten steel while said pressure is temporarily elevated to 20 Torr or above, and conducting final decarburization after reducing said pressure to 2 Torr or below. The addition of hydrogen may be conducted to meet the following conditions:[H].gtoreq.{([C]-[C]final)/5}+4wherein [H] represents the hydrogen content (ppm) in said molten steel in the state after the addition of hydrogen, [C] represents the carbon content (ppm) in the molten steel in the state after the addition of hydrogen, and [C] final represents the final carbon content (ppm) to be obtained.

公开(公告)号：US5769923A

公开(公告)日：1998-06-23

申请号：US680782

申请日：1996-07-16

申请人： Hiroshi Nishikawa ,  Masaru Washio ,  Tomomichi Terabatake ,  Akihito Hirota ,  Naoki Kikuchi

发明人： Hiroshi Nishikawa ,  Masaru Washio ,  Tomomichi Terabatake ,  Akihito Hirota ,  Naoki Kikuchi

IPC分类号： C21C5/00 ,  C21C5/28 ,  C21C5/46 ,  C21C7/068 ,  F27B3/22 ,  C21C5/30

CPC分类号： C21C7/0685 ,  C21C5/005 ,  C21C5/4606 ,  F27B3/225

摘要： Method and top blowing lance for decarburization refining chromium molten ferrous metal in which dust formation and chromium loss due to oxidation are suppressed and high productivity is achieved. Decarburization of molten ferrous metal is achieved by blowing gaseous oxygen into the molten metal in a refining furnace provided with a top blowing lance having a plurality of gas blowing nozzles at the tip of the lance. The gas blowing nozzles include at least one sub-nozzle provided at or near the lance axis and a plurality of main nozzles at an outer section of the lance. Blowing refining is carried out with oxygen flow from a plurality of the main nozzles at a flow rate higher than that from the sub-nozzle(s), when the carbon content in the molten metal is about 1 wt % or more.

摘要翻译： 用于脱碳精炼铬冶炼黑色金属的方法和顶吹喷枪，其中由于氧化而产生粉尘形成和铬损失并且实现高生产率。 熔融黑色金属的脱碳是通过在精炼炉中将气态氧吹入熔融金属而实现的，所述精炼炉具有在喷枪尖端具有多个气体吹制喷嘴的顶吹喷枪。 气体喷射喷嘴包括设置在喷枪轴线处或附近的至少一个副喷嘴和在喷枪外部的多个主喷嘴。 当熔融金属中的碳含量为约1重量％以上时，以比来自副喷嘴的流量高的流量从多个主喷嘴的氧气流进行吹炼精炼。

公开(公告)号：US5743938A

公开(公告)日：1998-04-28

申请号：US764438

申请日：1996-12-12

申请人： Hiroshi Nishikawa ,  Masaru Washio ,  Naoki Kikuchi

发明人： Hiroshi Nishikawa ,  Masaru Washio ,  Naoki Kikuchi

IPC分类号： C21C5/35 ,  C21C7/068

CPC分类号： C21C5/35 ,  C21C7/0685

摘要： A method of decarburizing refining molten steel containing Cr in such a manner that oxygen gas, inert gas or a mixture of inert gas and oxygen gas is blown to the surface of bath of molten steel containing Cr in a refining chamber and to a position below the surface of the steel bath. Inert gas is blown to the surface of the steel bath, and oxygen gas, the inert gas or a mixture of oxygen gas and inert gas is blown below the surface of the steel bath in a portion of or all of an overall period in which the concentration of C in the molten steel is in a range of 1 wt % and 0.05 wt %. Slag and molten steel are stirred so as to cause Cr.sub.2 O.sub.3 in the slag and C in the molten steel to positively take part in a reaction represented by expression (1) below: Cr.sub.2 O.sub.3 +3C.fwdarw.2Cr+3CO (1)

摘要翻译： 将含有Cr的精炼钢水脱碳的方法，即将氧气，惰性气体或惰性气体与氧气的混合物吹入澄清室中含有Cr的钢水浴的表面，并且向下方 钢浴表面。 将惰性气体吹入钢水浴表面，并将氧气，惰性气体或氧气和惰性气体的混合物吹入钢浴表面的整个时间段的一部分或全部 钢水中的C浓度在1重量％〜0.05重量％的范围内。 搅拌炉渣和钢水以使熔渣中的Cr 2 O 3和钢水中的C积极地参与由下式（1）表示的反应：Cr 2 O 3 + 3C-> 2Cr + 3CO（1）

公开(公告)号：US5728348A

公开(公告)日：1998-03-17

申请号：US684093

申请日：1996-07-19

申请人： Nozomu Tamura ,  Sumio Yamada ,  Masaru Washio ,  Toshio Kanatani

发明人： Nozomu Tamura ,  Sumio Yamada ,  Masaru Washio ,  Toshio Kanatani

IPC分类号： B22D41/00 ,  C21C7/10 ,  F27D1/18 ,  C21B7/02

CPC分类号： C21C7/10 ,  B22D41/00

摘要： Ladles used for vacuum refining processes, for example a VOD process, are provided with covers to cover openings of ladles. The covers generally consist of refractories, which are required to have excellent resistance to thermal spalling due to heat cycles and not inhibit decarbonization during refining processes of molten steel. The ladle cover comprises a refractory having a carbon content 5 wt % or more. Preferably, a refractory has a carbon content 5 wt % or more is used for a central section of the ladle cover, and a refractory having a carbon content less than 5 wt % is used for peripheral sections of the ladle cover.

摘要翻译： 用于真空精炼过程的钢瓶，例如VOD工艺，设有盖子以覆盖钢包的开口。 覆盖层通常由耐火材料组成，耐火材料由于热循环而具有优异的抗散热性，并且在钢水精炼过程中不会抑制脱碳。 钢包盖包括碳含量为5重量％以上的耐火材料。 优选地，耐火材料具有5重量％以上的碳含量用于钢包盖的中心部分，并且碳含量小于5重量％的耐火材料用于钢包盖的周边部分。

公开(公告)号：US5221326A

公开(公告)日：1993-06-22

申请号：US700605

申请日：1991-05-15

申请人： Koji Yamaguchi ,  Yasuo Kishimoto ,  Toshikazu Sakuraya ,  Masaru Washio ,  Kazuhisa Hamagami ,  Hiroshi Nishikawa

发明人： Koji Yamaguchi ,  Yasuo Kishimoto ,  Toshikazu Sakuraya ,  Masaru Washio ,  Kazuhisa Hamagami ,  Hiroshi Nishikawa

IPC分类号： C21C7/10

CPC分类号： C21C7/10

摘要： A method of producing an ultra-low-carbon steel by conducting vacuum-decarburization of a molten steel by means of a vacuum degasifier of the type having recirculation pipes and a vacuum chamber. When the carbon content of the molten steel has come down to a level of 50 ppm or less, hydrogen gas is introduced together with an inert gas into the molten steel either by directly injecting a hydrogen-containing gas into the molten steel in the vacuum chamber through a tuyere provided in the wall of the vacuum chamber or by blowing the hydrogen-containing gas onto the surface of the molten steel in the vacuum chamber through a lance provided in the vacuum chamber. In order to enhance the effect produced by the method of the present invention, it is possible to take an additional measure such as blowing of hydrogen gas through a tuyere provided in the wall of the recirculation pipe or injection of hydrogen or hydrogen-containing gas through an injection lance immersed in the molten steel held in, a ladle.