公开(公告)号：US20220235427A1

公开(公告)日：2022-07-28

申请号：US17476501

申请日：2021-09-16

Applicant: University of Science and Technology Beijing ,  Soochow University

Inventor： Rong ZHU ,  Shaoyan HU ,  Kai DONG ,  Rongfang SU ,  Weifeng LI

IPC: C21C5/46 ,  C21C5/48 ,  F27D3/16 ,  C21C5/30

Abstract: A long-life service method for powder-bottom-injecting converter based on collaborative hot replacement of furnace bottom and bottom purging brick belongs to the field of steelmaking technologies using powder-bottom-injecting converters. According to equipment characteristics, process characteristics, and erosion characteristics of the powder-bottom-injecting converter, the design, arrangement, installation, use, maintenance, and replacement of the bottom purging/powder injection bricks are systematically optimized and improved, a technology of automatically detecting the erosion height of bottom purging bricks is adopted, and hot replacement of bottom purging/powder injection bricks and hot replacement of the converter furnace bottom are used collaboratively, which not only can prolong the service life of a single bottom purging/powder injection brick, but also can greatly prolong the overall life of the powder-bottom-injecting converter from 1000-3000 heats in the prior art to 6000-10000 heats. Hence, the life of the powder-bottom-injecting converter is as long as that of a conventional converter.

公开(公告)号：US20220118563A1

公开(公告)日：2022-04-21

申请号：US17268638

申请日：2020-09-29

Applicant: UNIVERSITY OF SCIENCE AND TECHNOLOGY BEIJING

Inventor： Zhiyong LIU ,  Baozhuang SUN ,  Xiaogang LI ,  Yedong HE

IPC: B23P6/00 ,  G01N17/00 ,  B23K15/00

Abstract: A repair method for self-detecting and self-healing of corrosion defects in metals can achieve self-detecting and self-healing repair of an initial corrosion defect and be used to repair a micron-level corrosion defect. Furthermore, the self-detecting and self-healing repair method can be used to effectively repair an initial corrosion defect in a large-sized high-precision structural component, thus effectively improving the service safety of the high-precision metal structural component and prolonging the service life of the same.

公开(公告)号：US11267744B2

公开(公告)日：2022-03-08

申请号：US16462539

申请日：2018-05-30

Applicant: University of Science and Technology Beijing

Inventor： Aixiang Wu ,  Shaoyong Wang ,  Lianfu Zhang ,  Zhuen Ruan ,  Shenghua Yin ,  Hongjiang Wang ,  Yiming Wang

IPC: C02F11/12 ,  C02F11/121 ,  B09B3/00 ,  B09B1/00

Abstract: A gold mine cyanide tailing disposal method is provided. The disposal method performs a harmless decyanation treatment on a cyanide tailing slurry obtained from a mineral processing plant, and then performs a resource treatment where a cyanide tailing slurry is subjected to a thickening to obtain a higher concentration. When a backfill is needed, a paste is produced by adding a cementing material after a homogenized stirring of a two-stage horizontal agitator pumped to an underground mining site for filling by a plunger pump. The cementing material is to solidify an underflow and prevent cyanide from being filtered out. When a backfill is not needed, the paste is directly delivered to an open storage area for storing by the plunger pump.

公开(公告)号：US11261504B2

公开(公告)日：2022-03-01

申请号：US16252908

申请日：2019-01-21

Applicant: University of Science and Technology Beijing

Inventor： Haiwen Luo ,  Pengyu Wen

IPC: C21D9/46 ,  C21D8/02 ,  C21D6/00 ,  C22C38/54 ,  C22C38/50 ,  C22C38/48 ,  C22C38/46 ,  C22C38/44 ,  C22C38/42 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00

Abstract: A method for producing ultra-high strength martensitic cold-rolled steel sheet adopts pulsed ultra-rapid heating of cold-rolled martensitic steel sheets after smelting, solidification, hot rolling, billet or ingot casting, as well as conventional manufacturing processes such as hot continuous rolling and winding, pickling, and room temperature cold rolling. The steel sheets are rapidly heated at a heating rate of 100-500° C./s to a single-phase region of austenite, and then the samples are immediately water-cooled to obtain martensite structure without undergoing heat preservation or a very short holding time. The tensile strength of the martensitic steel is in the range of 1800-2300 MPa, and the total elongation can reach 12.3%. Compared with the continuous annealing product of the same martensitic steel, the tensile strength is increased by 700 MPa or more, and the maximum increase of total elongation is 6%.

公开(公告)号：US11203792B2

公开(公告)日：2021-12-21

申请号：US16052640

申请日：2018-08-02

Applicant: University of Science and Technology Beijing

Inventor： Qingzhi Yan ,  Zhiyuan Hong

IPC: C21D8/00 ,  C21D6/00 ,  C22C38/32 ,  C22C38/28 ,  C22C38/24 ,  C22C38/22 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C22C38/26

Abstract: A method for preparing oxide dispersion strengthening F/M steel using smelting and casting process, which belongs to the field of metal materials. The composition of the steel comprises: C: 0.08-0.15%, Cr: 8.0-14%, Mn: 0.45-0.6%, W: 1.0-2.5%, N: 0.05-0.07%, Ta: 0.010-0.20%, Ti: 0.02-0.55%, Si: 0.10-0.15%, V: 0.04-0.5%, O: 30-200 ppm, B

公开(公告)号：US11192176B1

公开(公告)日：2021-12-07

申请号：US17226019

申请日：2021-04-08

Applicant: UNIVERSITY OF SCIENCE AND TECHNOLOGY BEIJING

Inventor： Qing Liu ,  Yanshen Han ,  Jiangshan Zhang

IPC: B22D11/124 ,  B22D11/14 ,  B22D11/22 ,  B22D11/128

Abstract: A method for improving center segregation and surface crack of continuous casting medium-thick slab of peritectic steel reduces the cooling intensity at the earlier stage of solidification and enhancing the cooling intensity at the final stage of solidification. For example, the cooling water amount of the wide face of the mould is 3400-3600 L/min, and the cooling water amount of the narrow face of the mould is 480-530 L/min. The cooling water amount of the wide face of the foot roller section is 239-298 L/min, and the cooling water amount of the narrow face of the foot roller section is 61-65 L/min. The total cooling water amount of the sector segment is 1517-2166 L/min.

公开(公告)号：US20210363603A1

公开(公告)日：2021-11-25

申请号：US17021404

申请日：2020-09-15

Applicant: University of Science and Technology Beijing

Inventor： Jinfeng HUANG ,  Jin ZHANG ,  Cheng ZHANG ,  Chao ZHAO ,  Yong LIAN ,  Jianqiang LI ,  Cheng ZHANG

IPC: C21D9/00 ,  C21D8/00 ,  C21D6/00 ,  C21D1/28 ,  C22C1/02 ,  C22C38/54 ,  C22C38/52 ,  C22C38/50 ,  C22C38/48 ,  C22C38/46 ,  C22C38/44 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  B22C9/06 ,  B21D37/10

Abstract: The present application provides a hot-work die steel and a preparation method thereof, wherein the chemical constituents of the hot-work die steel in mass percentage are as follows: C: 0.20-0.32 wt %, Si: ≤0.5 wt %, Mn: ≤0.5 wt %, Cr: 1.5-2.8 wt %, Mo: 1.5-2.5 wt %, W: 0.5-1.2 wt %, Ni: 0.5-1.6 wt %, V: 0.15-0.7 wt %, Nb: 0.01-0.1 wt %, and a balance of iron, wherein an alloying degree is 5-7%; a tensile strength of the hot-work die steel at 700° C. is 560-700 MPa; a value of hardness of the hot-work die steel at room temperature is 32-38 HRC after holding at 700° C. for 3-5 h; and the hot-work die steel has an elongation of 14% to 16% at room temperature, a percentage reduction of area of 48% to 65%, and an impact toughness of 52-63 J at room temperature. The hot-work die steel of the present application has an excellent thermal stability as well as a good plasticity and a toughness at room temperature.

公开(公告)号：US20210357195A1

公开(公告)日：2021-11-18

申请号：US17444054

申请日：2021-07-29

Applicant: UNIVERSITY OF SCIENCE AND TECHNOLOGY BEIJING

Inventor： Yan ZHU ,  Di WANG ,  Bohan QIN ,  Weijing SONG

IPC: G06F8/51 ,  G06F8/41 ,  G06F8/60 ,  G06Q50/18 ,  H04L9/32

Abstract: A method for executable smart legal contract construction and execution over legal contracts includes several steps. 1) Use the specified smart contract language to formally represent attributes and terms in natural language contracts, further generate smart contracts. 2) Use the conversion rules over target language to translate the smart legal contracts into executable target language contracts. 3) Each of target language contracts is compiled, further encapsulated as a blockchain transaction which is issued into blockchain via consensus protocol. The deployment of the contracts is completed once the contracting parties sign the target language contracts. 4) Once term of the smart legal contract is triggered, the corresponding functions of the target language contract will be executed by the blockchain nodes, and the execution results are issued to blockchain in a blockchain transaction form. After validation, the transaction is stored into blockchain as an electronic certification of contract execution.

公开(公告)号：US20210197264A1

公开(公告)日：2021-07-01

申请号：US17200475

申请日：2021-03-12

Applicant: UNIVERSITY OF SCIENCE AND TECHNOLOGY BEIJING

Inventor： Gang CHEN ,  Mingli QIN ,  Qiying TAO ,  Xuanhui QU

IPC: B22F9/04 ,  B33Y70/00 ,  B01J2/16 ,  B22F1/00

Abstract: A method of preparation of titanium and titanium alloy powder for 3D printing is based on a fluidized bed jet milling technique. Hydride-dehydrate titanium powder and titanium alloy powder are used as main raw material powder, jet milling and shaping are carried out in shielding atmosphere of nitrogen or argon, and finally high-performance titanium and titanium alloy powder meeting the requirements of 3D printing process is obtained. The titanium and titanium alloy powder prepared using this method has a narrow particle size distribution, approximately spherical shape, and controllable oxygen content.

公开(公告)号：US20210095360A1

公开(公告)日：2021-04-01

申请号：US16634909

申请日：2018-09-19

Applicant: UNIVERSITY OF SCIENCE AND TECHNOLOGY BEIJING ,  BOEING (CHINA) CO., LTD.

Inventor： Shengen ZHANG ,  Bo LIU ,  Rui LIN

IPC: C22C1/02 ,  B22D21/00 ,  B22D43/00 ,  C22C1/03 ,  B22C9/08 ,  C22B21/00 ,  C22B21/06

Abstract: The present invention relates to techniques for producing 2024 and 7075 aluminum alloys by recycling waste aircraft aluminum alloys, which belong to technical fields for circular economy. The present invention develops techniques for obtaining the 2024 and 7075 aluminum alloys by subjecting waste aircraft aluminum alloys as raw materials to pretreatment, smelting, impurity removal, melt ingredient assay, ingredient adjustment, refining, and casting. Through utilizing the waste package aluminum alloys and the waste aluminum pop-top cans to adjust the ingredients, the waste aircraft aluminum alloys would be recycled at a lower cost without downgrading. The present invention has some advantages, such as low cost, and applicability for industrial production, as well as prominent economic benefit.