公开(公告)号：EP2208799A4

公开(公告)日：2016-05-11

申请号：EP08778316

申请日：2008-07-23

申请人： NIPPON STEEL & SUMITOMO METAL CORP

发明人： NUMATA MITSUHIRO ,  TAKEUCHI SHINGO ,  OMURA TOMOHIKO

IPC分类号： C21C7/064 ,  C21C7/00 ,  C21C7/04 ,  C21C7/06 ,  C21C7/10 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/14 ,  C22C38/58

CPC分类号： C21C7/06 ,  C21C7/0075 ,  C21C7/04 ,  C21C7/064 ,  C21C7/10 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06

摘要： The steel for steel pipes of the present invention is the one for steel pipes excellent in sour-resistance performance including C, Mn, Si, P, S, Ti, Al, Ca, N and O, and optionally including a predetermined amount of one or more of Cr, Ni, Cu, Mo, V, B and Nb, in which inclusions in the steel have Ca, Al, O and S as main components, the CaO content in the inclusions is 30 to 80%, the ratio of the N content in the steel (ppm) to the CaO content in the inclusions (%) is from 0.28 to 2.0, and the CaS content in the inclusions is 25% or less. In addition, the method of producing steel for steel pipes of the present invention is to produce steel for steel pipes in which Ca is added so that the ratio of the N content in the steel to the amount of Ca addition (kg/t) into the molten steel is from 200 to 857. According to the production method of the present invention, a slag composition, temperature-raising heating of molten steel, stirring treatment of molten steel and slag, and the Ca addition are optimized, whereby high-strength HIC resistant steel for steel pipes that exhibit excellent sour-resistance performance and cleanliness can be stably manufactured.

摘要翻译： 本发明的钢管用钢是耐酸性优异的钢管，包括C，Mn，Si，P，S，Ti，Al，Ca，N和O，并且可选地包括预定量的一种 以Cr，Ni，Cu，Mo，V，B，Nb为主成分，其中夹杂物的Ca，Al，O，S为主成分，夹杂物的CaO含量为30〜80％ 钢中的N含量（ppm）与夹杂物中的CaO含量（％）为0.28〜2.0，夹杂物中的CaS含量为25％以下。 另外，本发明的钢管用钢的制造方法，是将钢中的N含量与Ca添加量（kg / t）的比例加入到（kg / t）的钢管中， 钢水为200〜857。根据本发明的制造方法，优化炉渣组成，钢水升温加热，钢水和渣的搅拌处理以及Ca添加，优选高强度 可以稳定地制造具有优异的耐酸性能和清洁度的用于钢管的HIC耐钢。

公开(公告)号：EP2889385A4

公开(公告)日：2016-04-13

申请号：EP13830632

申请日：2013-08-20

申请人： MAGANG GROUP HOLDING CO LTD ,  MAANSHAN IRON & STEEL CO LTD

发明人： WU LIPING ,  SHEN CHANG ,  HU YUCHANG ,  PAN YUANWANG ,  PU SHAOMIN ,  WANG YONG ,  XIE YANGGUO

IPC分类号： C21C7/10

CPC分类号： C21C7/10 ,  C21C7/064 ,  C21C7/068 ,  C21C7/072

摘要： The present invention discloses a straight barrel type vacuum refining device comprising a vacuum chamber and a snorkel; during the vacuum refining the snorkel is inserted into the molten steel of the steel ladle, it is characterized in that, disposing a circulating tube being on the circumference of said snorkel, and blowing argon gas into the snorkel through the nozzles on an inner wall of a circulating tube; said circulating tubes are disposed in layers, the nozzles on the circulating tubes in the same layer are individually controlled as 2-6 in one group; disposing an eccentric gas permeable brick at the bottom of said steel ladle, and blowing argon gas into the steel ladle through the eccentric gas permeable brick, driving a circulating flow molten steel between the steel ladle and the vacuum chamber by using different blowing flow rate combinations of a steel ladle bottom blowing and each individually controlled unit of the circulating tube blowing system. The operation method of the straight barrel type vacuum refining device is: the vacuum refining process uses a combined blown mode of steel ladle bottom eccentric gas permeable brick and the circulating tube of the snorkel, during decarburization the bottom blowing and the circulating tube on the same side as the bottom blowing are strong blowing, and the circulating tube on the other side is weak blowing; during desulfurization, the bottom blowing is strong blowing, and the circulating tubes around the snorkel are all weak blowing.

公开(公告)号：EP2722405A4

公开(公告)日：2015-09-30

申请号：EP12823682

申请日：2012-08-08

申请人： JFE STEEL CORP

发明人： KINOSHIRO SATOSHI ,  ITO TOSHIYUKI ,  KAWABATA RYO ,  ISHIGE TOSHIRO ,  FUJIMOTO KYOKO ,  INOSE MASAO

IPC分类号： C21C7/064 ,  C21C7/00 ,  F27D19/00 ,  F27D21/00 ,  G01N21/64 ,  G01N31/00

CPC分类号： C21C7/0645 ,  C21C1/02 ,  C21C7/0006 ,  C21C7/0037 ,  C21C7/0075 ,  C21C7/0087 ,  C21C7/06 ,  C21C7/064 ,  C21C7/10 ,  C21C2007/0093 ,  C21C2300/08 ,  F27D19/00 ,  F27D21/00 ,  G01N21/64 ,  G01N21/645 ,  G01N33/0042 ,  Y02A50/248

摘要： There are provided a method for desulfurizing molten steel, characterized in that a sample taken out from molten steel after the tapping from a converter or during the secondary refining is analyzed rapidly in a high accuracy by a method comprising a high frequency induction heating step wherein the sample is combusted and oxidized under the high frequency induction heating in a pure oxygen atmosphere to convert S in the sample into SO 2 and an analyzing step wherein SO 2 -containing gas produced in the high frequency induction heating step is analyzed through an ultraviolet fluorescence method to quantify S concentration of the sample, whereby S concentration of molten steel after the tapping from the converter can be controlled in a high accuracy to prevent failure of S concentration and also desulfurization time in the secondary refining can be shortened and the amount of the desulfurizer or the like used can be reduced, and a method of manufacturing molten steel by using such a method.

公开(公告)号：EP2343390B1

公开(公告)日：2015-08-19

申请号：EP09823351.3

申请日：2009-10-30

申请人： Nippon Steel & Sumitomo Metal Corporation

发明人： UEDA, Masaharu ,  SEKI, Kazunori ,  SATOU, Takuya ,  YAMAMOTO, Takeshi

IPC分类号： C22C38/04 ,  C22C38/58 ,  C21C7/00 ,  C21C7/04

CPC分类号： C22C38/02 ,  C21C7/0025 ,  C21C7/064 ,  C22C38/002 ,  C22C38/04

公开(公告)号：EP2816125A4

公开(公告)日：2015-03-04

申请号：EP12871396

申请日：2012-03-13

申请人： ANGANG STEEL CO LTD

发明人： TANG FUPING ,  LI ZHEN ,  WANG XIAOFENG ,  FEI PENG ,  MENG JINSONG ,  ZHANG YUE ,  MA YONG ,  WANG WENZHONG ,  ZHANG ZHIWEN ,  WANG XIAOSHAN ,  GUO MENG ,  ZHAO ZHIGANG ,  LIN YANG ,  XIN GUOQIANG ,  YAO WEIZHI

IPC分类号： C21C7/04 ,  C21C5/28 ,  C21C7/064

CPC分类号： C21C7/064 ,  B22D11/001 ,  C21C1/025 ,  C21C5/35 ,  C21C5/36 ,  C21C7/0043 ,  C21C7/0068 ,  C21C7/0087 ,  C21C7/0645 ,  C21C7/072 ,  C21C7/10 ,  C21C2300/08

摘要： A method for preparing low-cost clean steel includes steps of: preliminarily desulfurizing iron melt: preliminarily desulfurizing in an iron melt channel during blast furnace tapping and during iron folding in an iron folding room, adding a desulfurizing ball into the iron melt during the blast furnace tapping or the iron folding; dephosphorizing and controlling sulfur: dephosphorizing and controlling sulfur during converter steelmaking, in such a manner that P ‰¤ 0.014% and S ‰¤ 0.004% during tapping; rapidly dephosphorizing by slag-forming: rapidly dephosphorizing by slag-forming during converter tapping, at a converter end point, controlling a C content at 0.02ˆ¼0.10%, adding a dephosphorizing ball through an alloy chute during the converter tapping, blowing argon and stirring at the same time; purifying steel melt during RH refining: adding a purifying ball at a late stage of the RH refining when a vacuum degree is at 66.7ˆ¼500Pa; and continuously casting with whole-process protection. According to the present invention, steel quality is effectively improved while cost is lowered. Compared with the conventional process, raw materials utilized in the method are cheap, the cost per ton of steel is reduced by5-10 Yuan.

摘要翻译： 制备低成本清洁钢的方法包括以下步骤：预先将铁熔体脱硫：在高炉出钢期间和铁折叠期间的铁熔体通道中预先脱硫，在铁折叠室中铁折叠期间，在爆炸期间向铁熔体中加入脱硫球 炉膛或熨斗折叠; 脱磷控硫：转炉炼钢过程中硫酸脱磷控制方式，采that‰‰‰‰‰‰‰‰‰‰‰‰‰‰‰;;;¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤;;;;;;;; 通过成渣快速脱磷：在转炉攻丝期间，在转炉终点处通过成渣快速脱磷，控制C含量为0.02〜0.10％，在转炉攻丝期间加入脱磷球通过合金槽，吹入氩气和 同时搅拌; 在精炼过程中净化钢材熔体：当真空度为66.7 / 500Pa时，在RH精炼的后期添加净化球; 并持续铸造全过程保护。 根据本发明，在降低成本的同时有效地提高了钢质量。 与传统工艺相比，该方法使用的原料便宜，每吨钢材成本降低5-10元。

公开(公告)号：EP1757706B1

公开(公告)日：2014-10-08

申请号：EP06124570.0

申请日：2000-05-12

申请人： Nippon Steel & Sumitomo Metal Corporation

发明人： Kunitake, Okitomo ,  Omura, Norio ,  Sakai, Wataru ,  Mukawa, Susumu ,  Imai, Tadashi

IPC分类号： C21C7/068 ,  C21C7/064 ,  C21C7/10

CPC分类号： C21C7/064 ,  C21C7/0075 ,  C21C7/068 ,  C21C7/10

公开(公告)号：EP2722405A1

公开(公告)日：2014-04-23

申请号：EP12823682.5

申请日：2012-08-08

申请人： JFE Steel Corporation

发明人： KINOSHIRO, Satoshi ,  ITO, Toshiyuki ,  KAWABATA, Ryo ,  ISHIGE, Toshiro ,  FUJIMOTO, Kyoko ,  INOSE, Masao

IPC分类号： C21C7/064 ,  C21C7/00 ,  G01N21/64 ,  G01N31/00

CPC分类号： C21C7/0645 ,  C21C1/02 ,  C21C7/0006 ,  C21C7/0037 ,  C21C7/0075 ,  C21C7/0087 ,  C21C7/06 ,  C21C7/064 ,  C21C7/10 ,  C21C2007/0093 ,  C21C2300/08 ,  F27D19/00 ,  F27D21/00 ,  G01N21/64 ,  G01N21/645 ,  G01N33/0042 ,  Y02A50/248

摘要： There are provided a method for desulfurizing molten steel, characterized in that a sample taken out from molten steel after the tapping from a converter or during the secondary refining is analyzed rapidly in a high accuracy by a method comprising a high frequency induction heating step wherein the sample is combusted and oxidized under the high frequency induction heating in a pure oxygen atmosphere to convert S in the sample into SO 2 and an analyzing step wherein SO 2 -containing gas produced in the high frequency induction heating step is analyzed through an ultraviolet fluorescence method to quantify S concentration of the sample, whereby S concentration of molten steel after the tapping from the converter can be controlled in a high accuracy to prevent failure of S concentration and also desulfurization time in the secondary refining can be shortened and the amount of the desulfurizer or the like used can be reduced, and a method of manufacturing molten steel by using such a method.

摘要翻译： 提供了用于脱硫的钢水，其特征在于在没有从一个转换器或二次精炼期间轻敲后从钢水中取出的样品中通过的方法的高精确度快速分析，其包括高频感应加热工序worin所述的方法 样品燃烧并在纯氧气氛至S转换成样品的高频感应加热下氧化成SO 2和在分析步骤worin所以在高频感应加热工序中制造2种的气体被通过到紫外荧光法分析 以量化样品，由此，从转换器中的钢后的钢水S浓度可以高精确度地控制，以防止S浓度的故障，因此在二次精炼的脱硫时间可被缩短的S浓度和脱硫器的量 或使用等可以被减小，并且满足通过使用搜索的制造钢水的方法 HOD。

公开(公告)号：EP2522758A1

公开(公告)日：2012-11-14

申请号：EP10842168.6

申请日：2010-12-08

申请人： Nisshin Steel Co., Ltd.

发明人： SUGIURA Masayuki ,  MORI Masakazu ,  YOSHINO Takahiro

IPC分类号： C21C7/04 ,  C21C1/02 ,  C21C7/064

CPC分类号： C21C1/06 ,  C21C1/02 ,  C21C1/04 ,  C21C7/064 ,  F27D27/00

摘要： [Problem] To provide an operation method for noticeably prolonging the life of "rotor" where the impeller and the axial rod are integrated with each other, in mechanical stirring of chrome-containing molten iron.
[Means for Resolution] An operation method for mechanically stirring chrome-containing molten iron, which comprises a refining process of mechanically stirring chrome-containing molten iron contained in a refining vessel by the use of an impeller having a rotation axis in the vertical direction where the refining vessel is such that the horizontal cross section of the inner wall thereof is circular around the central axis of the vessel in the vertical direction and the impeller, as integrated with the axial rod covered with a refractory, rotates around the central axis of the axial rod, as the rotation axis thereof, wherein:
the stirring mode is regularly or irregularly switched, as selected for each stirring charge, between "concentric stirring mode" of stirring the molten iron in a state where the rotation axis of the impeller is centered in the central axis of the vessel and "eccentric stirring mode" of stirring the molten iron in a state where the rotation axis of the impeller is decentered from the central axis of the vessel.

公开(公告)号：EP2455501A1

公开(公告)日：2012-05-23

申请号：EP10799642.3

申请日：2010-07-15

申请人： Kabushiki Kaisha Kobe Seiko Sho

发明人： NAKAYAMA, Jumpei ,  KUSAMICHI, Tatsuhiko

IPC分类号： C22B9/22 ,  C21C7/00 ,  C21C7/04 ,  C21C7/064 ,  C21C7/068 ,  C22B9/10 ,  C22C1/02 ,  C22C33/04

CPC分类号： C22B9/003 ,  C21C7/064 ,  C21C7/068 ,  C22B9/006 ,  C22B9/10 ,  Y02P10/253

摘要： Disclosed is a method for producing alloy ingot including: a step of: charging alloy starting material into a cold crucible in a cold-crucible induction melter, and forming melt pool of the alloy starting material by induction heating in inert gas atmosphere; a step of continuing the induction heating and adding first refining agent to the melt pool, and then reducing the content of at least phosphorus from among impurity elements present in the melt pool; and a step of forming alloy ingot by solidifying the melt, the phosphorus content of which has been reduced. The first refining agent is mixture of metallic Ca and flux, where the flux contains CaF 2 and at least one of CaO and CaCl 2 . The weight proportion of the sum of CaO and CaCl 2 with respect to CaF 2 ranges from 5 to 30 wt% and the weight proportion of metallic Ca with respect to the melt pool is 0.4 wt% or greater.

摘要翻译： 公开了一种生产合金锭的方法，包括：将合金原料装入冷坩埚感应熔炉中的冷坩埚中，并通过在惰性气体气氛中感应加热形成合金起始材料的熔池; 继续感应加热并将第一精炼剂加入到熔池中，然后从存在于熔池中的杂质元素中减少至少磷的含量的步骤; 以及通过固化熔融物形成合金锭的步骤，其中磷含量已经降低。 第一精炼剂是金属Ca和助熔剂的混合物，其中助熔剂含有CaF 2和CaO和CaCl 2中的至少一种。 CaO和CaCl 2之和相对于CaF 2的重量比例为5〜30重量％，金属Ca相对于熔融池的重量比为0.4重量％以上。

公开(公告)号：EP1445337B1

公开(公告)日：2011-12-21

申请号：EP02770227.3

申请日：2002-09-27

申请人： Nippon Steel Corporation

发明人： HIRATA, Hiroshi, C/O NIPPON STEEL CORP. ,  ISHII, Hiromi, C/O NIPPON STEEL CORP. ,  HAYASHI, Hiroaki, C/O NIPPON STEEL CORP. ,  OGAWA, Yuji, C/O NIPPON STEEL CORP. ,  SASAKI, Naoto, C/O NIPPON STEEL CORP. Tech. Dev.

IPC分类号： C21C1/02 ,  C21C7/064

CPC分类号： C21C7/064 ,  C21C1/02 ,  C21C1/025 ,  C21C5/32 ,  C21C7/0645 ,  C21C7/076 ,  Y02P10/242

摘要： The present invention provides, during dephosphorizing a hot metal by top blowing oxygen and injecting a flux by bottom blowing using a refining vessel having a top-and-bottom-blowing function, a dephosphorizing process capable of conducting excellent dephosphorization without using fluorite. That is, the process is as follows. A process for dephosphorizing a hot metal, wherein oxygen is top blown into a hot metal and a flux containing as a major component a component that is one or at least two substances selected from quick lime, limestone and iron oxide and that contains at least iron oxide is blown thereinto with oxygen, an inert gas or a mixture of the two gases used as a carrier gas, characterized by that the process including the step of blowing the flux into a hot metal in such a manner that the ratio of a mass of CaO in the blown flux to a total mass of oxygen (CaO/O) contained in iron oxide in the blown flux and in the carrier gas exceeds 2.5. Moreover, the present invention provides a process for dephosphorizing a hot metal comprising blowing the flux into a hot metal in such a manner that the proportion of solid oxygen based on the entire oxygen added becomes from 5 to 40% by mass.