公开(公告)号：US20240309475A1

公开(公告)日：2024-09-19

申请号：US18575895

申请日：2021-07-06

申请人： METSO METALS OY

发明人： Timo HAIMI ,  Olli PEKKALA

IPC分类号： C21B13/00 ,  C21B13/12 ,  C21C7/064

CPC分类号： C21B13/0006 ,  C21B13/008 ,  C21B13/12 ,  C21C7/064

摘要： A method for processing iron ore to obtain steel by feeding the DRI into a smelting furnace so as to obtain an intermediate iron product, which is then subsequently introduced into a conversion unit for obtaining steel form the intermediate iron product. Moreover, carbon is introduced into the process. As a consequence, a suitable carbon content may be achieved for the intermediate iron product such that impurities of the intermediate iron product may be reduced along with carbon contents thereof in a steel conversion process without sacrificing iron contents of the intermediate iron product. Simultaneously, suitable fluxes are fed into the smelting furnace together with the DRI, such that high-quality slag suitable as raw material for further processing is obtained therefrom. An associated smelting furnace arrangement is also disclosed.

公开(公告)号：US20240247330A1

公开(公告)日：2024-07-25

申请号：US18435044

申请日：2024-02-07

申请人： S.A. Lhoist Recherche et Developpement

发明人： Eric Perrin ,  Souliyann Chunlamani

IPC分类号： C21C7/064

CPC分类号： C21C7/0645

摘要： A slag conditioning agent for steel desulfurization is shown which is made by a process in which a dried slag material obtained from a secondary steelmaking process is mixed with quicklime particles. The quicklime particles react with moisture in the slag material to dry the slag material and produce a blend of slag material, hydrated lime and any unreacted quicklime. The blend is then sieved to separate out the hydrated lime. The retained dried fraction after sieving is then mixed with an Al2O3 mass fraction from which the slag conditioning agent can be collected. The slag conditioning agent has an equivalent mass ratio which is between 0.55 and 1.5.

公开(公告)号：US20240247328A1

公开(公告)日：2024-07-25

申请号：US18458173

申请日：2023-08-30

申请人： University of Science and Technology Beijing ,  Beijing Kemi Rongcheng Energy Technology Co., Ltd.

发明人： Kai DONG ,  Xin REN ,  Rong ZHU ,  Guangsheng WEI ,  Chao FENG ,  Rongfang SU ,  Shaoyan HU ,  Yun ZHOU ,  Chunyang WANG ,  Zhitao XUE ,  Linghui MENG

IPC分类号： C21C5/30 ,  C21C5/46 ,  C21C7/064

CPC分类号： C21C5/30 ,  C21C5/4606 ,  C21C5/466 ,  C21C7/0645 ,  C21C2005/4666

摘要： A converter bottom blowing system comprises a first gas source connected in parallel with a lime powder silo, a lime powder blowing tank and a first injector, where a first cut-off valve is arranged between the lime powder blowing tank and the first injector; a second gas source connected in parallel with the biochar powder silo, the biochar powder blowing tank and the second injector, where a second cut-off valve is arranged between the biochar powder blowing tank and the second injector; a converter, where a plurality of bottom blowing lances are arrayed at a bottom of a converter, the bottom blowing lances are connected with the first injector and the second injector through a three-way valve, a third cut-off valve is arranged between the first injector and the three-way valve, and a fourth cut-off valve is arranged between the second injector and the three-way valve.

公开(公告)号：US11932914B2

公开(公告)日：2024-03-19

申请号：US17309680

申请日：2019-12-17

申请人： S.A. Lhoist Recherche et Developpement

发明人： Eric Perrin ,  Souliyann Chunlamani

IPC分类号： C21C7/064

CPC分类号： C21C7/0645

摘要： A process for manufacturing a slag conditioning agent for steel desulfurization is shown in which a dried slag material Obtained from a secondary steelmaking process is mixed with quicklime particles. The quicklime particles react with moisture in the slag material to dry the slag material and produce a blend of slag material, hydrated lime and any unreacted quicklime. The blend is then sieved to separate out the hydrated lime. The retained dried fraction after sieving is then mixed with an Al2O3 mass fraction from which the slag conditioning agent can be collected. The slag conditioning agent has an equivalent mass ratio which is between 0.55 and 1.5.

公开(公告)号：US20230313330A1

公开(公告)日：2023-10-05

申请号：US18022802

申请日：2021-08-23

申请人： JFE STEEL CORPORATION

发明人： Nobuhiko ODA ,  Masanori TANNO ,  Rei YAMADA

IPC分类号： C21C7/064 ,  C21C5/54

CPC分类号： C21C7/064 ,  C21C5/54 ,  C21C2300/08

摘要： A method for efficiently manufacturing low-phosphorus molten steel by use of a steelmaking electric furnace, in which slag resulting from melting a solid iron source is effectively separated from molten steel, and thus a unit consumption of lime required to reduce a phosphorus content in the molten steel is reduced. The method includes: charging a solid iron source and an optional molten iron source and melting and heating these raw materials by using electric energy; partly or entirely removing slag generated during the melting; performing dephosphorization by adding dephosphorization flux; and tapping low-phosphorus molten steel thus refined, and in the method, a slag composition ratio being [CaO]/([SiO2]+[Al2O3]) of the slag to be removed is adjusted to be not less than 0.25 and not more than 0.70.

公开(公告)号：US11649514B2

公开(公告)日：2023-05-16

申请号：US16957444

申请日：2018-12-12

申请人： JFE Steel Corporation

发明人： Kenji Nakase ,  Yoshie Nakai ,  Naoki Kikuchi

IPC分类号： C21C1/02 ,  C21C7/064 ,  C22B1/02

CPC分类号： C21C1/025 ,  C21C7/0645 ,  C22B1/02

摘要： Proposed is a method for removing phosphorus from a phosphorus-containing substance which is applicable in an industrial scale so as to effectively reduce phosphorus contained in the phosphorus-containing substance. In this method, the phosphorus-containing substance used as a raw material for metal smelting or metal refining is reacted with a nitrogen-containing gas at a treatment temperature T (° C.) which is lower than a melting temperature (Tm) of the substance, so that phosphorus is removed preferably in the form of phosphorus nitride (PN). In this regard, a nitrogen partial pressure and an oxygen partial pressure in the nitrogen-containing gas are preferably controlled, thereby reducing a load of dephosphorization process, for example.

公开(公告)号：US20220411907A1

公开(公告)日：2022-12-29

申请号：US17756192

申请日：2020-03-23

申请人： NANJING IRON & STEEL CO., LTD.

发明人： DongMing DUAN ,  Chao SUN ,  YanTang CHEN ,  YuWe ZHOU ,  CongDao WANG ,  Ming LI

IPC分类号： C22C38/04 ,  C22C38/02 ,  C22C38/44 ,  C22C38/50 ,  C21D8/02 ,  C21C7/064 ,  C21D6/00 ,  C22C33/04

摘要： The present disclosure discloses a 690 MPa high-strength medium-manganese steel with low yield ratio and medium thickness and a manufacture method thereof, which relates to the technical field of steel smelting. The 690 MPa high-strength medium-manganese steel with low yield ratio and medium thickness is composed of the following chemical composition in mass percentage: C: 0.05%-0.10%, Mn: 4.1%-4.7%, Si: 0.15%-0.4%, P≤0.010%, S≤0.003%, Ti: 0.01%-0.05%, Ni+Cr+Mo≤0.6%, and the balance of Fe and unavoidable impurities. The steel plate manufactured meets the safety performance and construction cost requirements of the construction machinery on the ultra-high-strength steel in complex environments.

公开(公告)号：US20220340996A1

公开(公告)日：2022-10-27

申请号：US17764166

申请日：2019-10-17

申请人： INSTITUTE OF RESEARCH OF IRON AND STEEL, JIANGSU PROVINCE/SHA-STEEL CO., LTD ,  ZHANGJIAGANG RONGSHENG SPECIAL STEEL CO., LTD. ,  JIANGSU SHAGANG GROUP CO., LTD.

发明人： CHANGDONG ZOU ,  HAN MA ,  JIAQI ZHAO ,  KUI SHEN ,  XIAOFENG CAI ,  YIXIN SHI ,  YONGLIN HUANG

IPC分类号： C21D11/00 ,  C22C38/50 ,  C22C38/48 ,  C22C38/46 ,  C22C38/44 ,  C22C38/42 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D9/52 ,  C21D8/06 ,  C21D6/00 ,  B22D11/115 ,  C21C7/064 ,  C21C7/068 ,  C21C7/10 ,  B21B1/46 ,  B21B45/00

摘要： The present invention discloses a wire rod for an ultrahigh-strength steel cord and a manufacturing method thereof. The manufacturing method includes: smelting molten steel where inclusions in sizes ≥5 μm are at a number density ≤0.5/mm2 and sizes of inclusions are ≤30 μm; casting the molten steel into an ingot blank with a center carbon segregation value of 0.92-1.08; cogging the ingot blank into an intermediate blank with a center carbon segregation value of 0.95-1.05; rolling the intermediate blank into a wire rod; and performing temperature control cooling on the wire rod to obtain a wire rod with high purity, high homogeneity and tensile strength ≤1,150 MPa. The wire rod may be used for an ultrahigh-strength steel cord with single tensile strength ≥3,600 MPa.

公开(公告)号：US11118250B2

公开(公告)日：2021-09-14

申请号：US16335042

申请日：2017-06-21

申请人： Nippon Yakin Kogyo Co., Ltd.

发明人： Kenji Mizuno ,  Hidekazu Todoroki ,  Yosuke Baba ,  Yusuke Kobayashi ,  Waki Nishijima

IPC分类号： C22C38/50 ,  C21C5/54 ,  C21C7/06 ,  C21C7/064 ,  C21C7/068 ,  C21C7/076 ,  C21C7/10 ,  C22C1/02 ,  C22C30/00 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/44

摘要： Ti, N, Al, Mg, and Ca concentrations are controlled in order to prevent aggregation of TiN inclusions. Furthermore, not only is a Fe—Cr—Ni alloy having superior surface property provided, but also a method is proposed in which the Fe—Cr—Ni alloy is produced at low cost using commonly used equipment. The Fe—Cr—Ni alloy includes C≤0.05%, Si: 0.1 to 0.8%, Mn: 0.2 to 0.8%, P≤0.03%, S≤0.001%, Ni:16 to 35%, Cr: 18 to 25%, Al: 0.2 to 0.4%, Ti: 0.25 to 0.4%, N≤0.016%, Mg: 0.0015 to 0.008%, Ca≤0.005%, O: 0.0002 to 0.005%, freely selected Mo: 0.5 to 2.5% in mass % and Fe and inevitable impurities as the remainder, wherein Ti and N satisfy % N×% Ti≤0.0045 and the number of TiN inclusions not smaller than 5 μm is 20 to 200 pieces/cm2 at a freely selected cross section.

公开(公告)号：US10465258B2

公开(公告)日：2019-11-05

申请号：US15567142

申请日：2016-04-18

申请人： The Curators of the University of Missouri

发明人： Simon Lekakh ,  Von Richards ,  Ronald O'Malley ,  Jun Ge

IPC分类号： C21C7/00 ,  C21C7/068 ,  C22C33/04 ,  C21C7/06 ,  C22C38/06 ,  C22C38/28 ,  C22C38/02 ,  C22C38/04 ,  C22C38/44 ,  C21C7/064

摘要： A process for manufacturing an iron-based alloy comprising forming targeted fine oxide and/or carbide dispersoids in a melt, and sequentially precipitating transition-metal nitrides on the dispersoids for heterogeneous nucleation of equiaxed grains. An iron-based cast alloy having a highly equiaxed fine grain structure.