公开(公告)号：US20210394259A1

公开(公告)日：2021-12-23

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: B22D11/128 ,  B22D11/124 ,  B22D11/14

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：US20230142397A1

公开(公告)日：2023-05-11

申请号：US17897257

申请日：2022-08-29

Applicant: University of Science and Technology Beijing

Inventor： Qing LIU ,  Leilei ZOU ,  Jiangshan ZHANG ,  Huisheng WANG ,  Biao TAO

IPC: B22D11/22 ,  B22D11/00 ,  C21D6/02

CPC classification number: B22D11/225 ,  B22D11/001 ,  C21D6/02

Abstract: A secondary cooling control method for reinforcing surface solidification structure of microalloyed steel continuous casting bloom includes: in situ observing precipitation behavior of secondary phase particles of the microalloyed steel, and determining a concentrated precipitation temperature range; cooling the microalloyed steel at different cooling rates, obtaining a particle size and a volume fraction of the secondary phase particles of the microalloyed steel at different cooling rates; determining an optimal average cooling rate; determining an optimal average cooling rate r; determining an optimal average cooling rate; and determining an optimal average cooling rate range through intersection of the three optimal average cooling rates whereby the continuous casting secondary cooling is optimized. The present invention can enhance the surface solidification structure of continuous casting bloom and reduce surface and subsurface cracks of the microalloyed steel continuous casting bloom.

公开(公告)号：US20220145413A1

公开(公告)日：2022-05-12

申请号：US17478880

申请日：2021-09-18

Applicant: University of Science and Technology Beijing

Inventor： Qing LIU ,  Zicheng XIN ,  Jiangshan ZHANG ,  Junguo ZHANG ,  Chunhui ZHANG

IPC: C21C7/00

Abstract: A method and system for predicting an addition amount of slagging lime during ladle furnace (LF) refining, and an LF refining method are provided. The method includes: S1: calculating an actual sulfur distribution ratio in combination with a Kungliga Tekniska Högskolan (KTH) model and a least square method by using LF refining parameters; S2: calculating, according to a principle of sulfur mass conservation, a mass of final slag by using the LF refining parameters and the actual sulfur distribution ratio obtained in S1; and S3: calculating, according to a principle of material conservation during LF refining, an addition amount of slagging lime during the LF refining by using the LF refining parameters and the mass of the final slag obtained in S2, thereby predicting the addition amount of the required slagging lime.