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1. 发明授权

US4170467A Method for producing high chromium steels having extremely low carbon and nitrogen contents 失效
标题翻译：具有极低碳和氮含量的高铬钢的生产方法
公开(公告)号：US4170467A
公开(公告)日：1979-10-09
申请号：US872992
申请日：1978-01-27
申请人： Hiroyuki Kaito , Takashi Ohtani , Shoji Iwaoka , Yukio Oguchi , Shuya Yano , Akio Ejima
发明人： Hiroyuki Kaito , Takashi Ohtani , Shoji Iwaoka , Yukio Oguchi , Shuya Yano , Akio Ejima
IPC分类号： C21C7/00 , C21C7/04 , C21C7/068 , C21C7/10 , C22C38/18 , C22C33/00
CPC分类号： C22C38/18 , C21C7/04 , C21C7/0685 , C21C7/10
摘要： High chromium steels having extremely low carbon and nitrogen contents are produced by blowing more than 15 up to 40 Nl/min per ton of molten steel of an inert gas into a high chromium steel containing 0.8 to 2.5% of C and 10 to 35% of Cr in a ladle under a reduced pressure from bottom of a ladle and concurrently blowing oxygen gas to the molten steel surface to form 1 to 100 kg per ton of the molten steel of a slag containing not less than 20% of SiO.sub.2 and not more than 25% of Cr.sub.2 O.sub.3 at the end of oxygen blowing, terminating the oxygen blowing when the carbon concentration in the molten steel becomes not more than 0.020%, and subsequently blowing 6 to 40 Nl/min per ton of molten steel of an inert gas under a high vacuum of not more than 10 torr.
摘要翻译：通过将含有0.8〜2.5％的C和10〜35％的高铬钢的惰性气体吹入大于15升至40Nl / min的高惰性气体钢中，生产出具有极低碳和氮含量的高铬钢。 Cr在钢包中从钢包底部减压的同时向钢水表面吹氧气，每吨钢水中含有不少于20％SiO 2和不超过20％的炉渣形成1至100kg 在吹氧结束时为25％的Cr 2 O 3，当钢水中的碳浓度变为不大于0.020％时终止吹氧，随后在每升钢水中的惰性气体中吹入6〜40Nl / min 高真空不超过10托。

2. 发明授权

US4266970A Method for blowing gas from below into molten steel in refining vessel 失效
标题翻译：从精炼容器中将气体吹入钢水的方法
公开(公告)号：US4266970A
公开(公告)日：1981-05-12
申请号：US103177
申请日：1979-12-13
申请人： Shoji Iwaoka , Hiroyuki Kaito , Shigeo Anzai , Susumu Ushigome , Yoshiaki Watanabe , Nobuyuki Mimura
发明人： Shoji Iwaoka , Hiroyuki Kaito , Shigeo Anzai , Susumu Ushigome , Yoshiaki Watanabe , Nobuyuki Mimura
IPC分类号： B22D1/00 , C21C5/34
CPC分类号： B22D1/005
摘要： A method for blowing a gas from below into a molten steel in a refining vessel, which comprises: using a refining vessel including at least one gas blowing aperture provided in the bottom wall thereof and a frustoconical plug matching with said aperture, releasably inserted into said gas blowing aperture, which has a small-diameter bore having a diameter within the range of from 0.5 to 6.0 mm and a length within the range of from 60 to 700 mm; closing the top end of said bore of said plug opening into said vessel with a granular packing easily removable by the pressure of a gas blown, thereby ensuring prevention of a molten steel received in said vessel from penetrating into said bore during receiving said molten steel into said vessel; after receiving a molten steel into said vessel, blowing from below a gas having a pressure of over the static pressure of said received molten steel through said bore of said plug into said molten steel, thereby removing said packing to effect a prescribed gas blowing into said molten steel; and, after discontinuing said gas blowing, causing a portion of said molten steel in said vessel to penetrate by gravity into said bore of said plug to solidify said molten steel in said bore, thereby closing said bore to ensure prevention of said molten steel in said vessel from flowing out from said vessel.
摘要翻译：一种从精炼容器中将气体吹入钢水的方法，其特征在于，包括：使用精炼容器，该精炼容器包括设置在其底壁中的至少一个气体吹入口和与所述孔配合的截头圆锥形塞，可释放地插入所述气体吹入孔具有直径在0.5至6.0mm范围内且长度在60至700mm范围内的小直径孔; 将所述塞子开口的所述孔的顶端封闭到所述容器中，其中颗粒状填料可通过吹入气体的压力容易地移除，从而确保在接收所述钢水期间防止容纳在所述容器中的钢水渗透到所述孔中说船在将钢水接收到所述容器中之后，通过所述塞子的所述孔将具有超过所述接收的钢水的静压力的压力的气体从下方吹入所述钢水中，从而除去所述填料，以使规定的气体吹入所述钢水并且在停止所述气体吹送之后，使所述容器中的所述钢水的一部分通过重力穿透所述塞的所述孔，以使所述孔中的所述钢水固化，从而关闭所述孔，以确保防止所述钢容器从所述容器流出。

3. 发明授权

US4168158A Method for producing alloy steels having a high chromium content and an extremely low carbon content 失效
标题翻译：具有高铬含量和极低碳含量的合金钢的生产方法
公开(公告)号：US4168158A
公开(公告)日：1979-09-18
申请号：US858885
申请日：1977-12-08
申请人： Shoji Iwaoka , Takashi Ohtani , Hiroyuki Kaito
发明人： Shoji Iwaoka , Takashi Ohtani , Hiroyuki Kaito
IPC分类号： C21C7/068 , C21C7/10 , C21C5/32 , C21C5/34 , C22C33/04
CPC分类号： C21C7/0685 , C21C7/10
摘要： An alloy steel having a high chromium content and an extremely low carbon content is produced by soft blowing oxygen gas under vacuum into a molten steel in a ladle containing a high chromium content and a high carbon content while blowing an inert gas of a flowing rate of 1-15 Nl/min per ton of the molten steel into the molten steel until the carbon content in the molten steel becomes 0.025-0.050% by weight. And subsequently only the blowing of the inert gas is conducted into the molten steel under a high vacuum degree of less than 10 torr so that the reaction active area ratio becomes more than 7% to reduce the carbon content in the steel to less than 0.003%.
摘要翻译：通过在真空下将吹塑氧气在含有高铬含量和高碳含量的钢包中的钢水中制成具有高铬含量和极低碳含量的合金钢，同时吹入惰性气体的流动速率 1-15Nl / min /钢水中的钢水，直到钢水中的碳含量为0.025-0.050重量％。然后在低于10托的高真空度下仅将惰性气体吹入钢水中，使得反应有效面积比变为大于7％，将钢中的碳含量降至小于0.003％。

4. 发明授权

US4154603A Method of producing alloy steels having an extremely low carbon content 失效
标题翻译：生产碳含量极低的合金钢的方法
公开(公告)号：US4154603A
公开(公告)日：1979-05-15
申请号：US873002
申请日：1978-01-27
申请人： Yukio Oguchi , Shuya Yano , Akio Ejima , Hiroyuki Kaito , Takashi Ohtani , Shoji Iwaoka
发明人： Yukio Oguchi , Shuya Yano , Akio Ejima , Hiroyuki Kaito , Takashi Ohtani , Shoji Iwaoka
IPC分类号： C21C7/00 , C21C7/04 , C21C7/10 , C22C38/18
CPC分类号： C22C38/18 , C21C7/04 , C21C7/10
摘要： A method of producing alloy steels having an extremely low carbon content of not higher than 30 ppm is disclosed. The alloy steels can be obtained by vacuum treating a preliminarily decarburized molten steel in the presence of a proper amount of a slag containing specifically limited amounts of chromic oxide and silicon oxide under an inert gas atmosphere by means of a commonly used degassing apparatus.
摘要翻译：公开了一种生产碳含量低于30ppm的合金钢的方法。合金钢可以通过在惰性气体气氛下，通过常用的脱气装置在适量的含有特定量的氧化铬和氧化硅的炉渣的存在下对预先脱碳的钢水进行真空处理而获得。

5. 发明授权

US4154602A Method of denitriding a high chromium molten steel with a minimum chromium loss 失效
标题翻译：以最低铬损失脱氮高铬钢水的方法
公开(公告)号：US4154602A
公开(公告)日：1979-05-15
申请号：US872993
申请日：1978-01-27
申请人： Hiroyuki Kaito , Takashi Ohtani , Shoji Iwaoka , Yukio Oguchi , Shuya Yano , Akio Ejima
发明人： Hiroyuki Kaito , Takashi Ohtani , Shoji Iwaoka , Yukio Oguchi , Shuya Yano , Akio Ejima
IPC分类号： C21C7/00 , C21C7/04 , C21C7/068 , C21C7/10 , C22C33/00
CPC分类号： C21C7/0685 , C21C7/04 , C21C7/10
摘要： A method of denitriding a high chromium molten steel with a minimum chromium loss is disclosed. A high chromium molten steel containing 0.8-2.5% of C and 10-35% of Cr is denitrided to a final nitrogen content of not more than 40 ppm in a ladle under vacuum by flowing an inert gas into molten steel at a flow rate of not less than 15 Nl/min per ton of molten steel and at the same time blowing oxygen gas against molten steel until carbon content [C] in molten steel satisfies the following equations (1) and (2) in accordance with the carbon content prior to decarburization [C] of molten steel:[C].ltoreq.[C] 0.3, when 0.8.ltoreq.[C].ltoreq.1.0% (1)[c].ltoreq.55/70[c]--6/70, when 1.0.ltoreq.[C].ltoreq.2.5% (2).
摘要翻译：公开了一种对具有最低铬损失的高铬钢水进行脱氮的方法。含有0.8-2.5％C和10-35％Cr的高铬钢水在真空下在钢包中通过将惰性气体流入钢水中以最大氮含量不超过40ppm进行脱氮，流速为每吨钢水不低于15Nl / min，同时对钢水吹入氧气，直到钢水中的碳含量[C]满足以下等式（1）和（2）钢水脱碳[C]：

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