公开(公告)号：US20230092345A1

公开(公告)日：2023-03-23

申请号：US17992245

申请日：2022-11-22

申请人： POSCO Co., Ltd

发明人： Sang-Ho HAN ,  Je-Woong LEE

IPC分类号： C22C38/04 ,  C22C38/18 ,  C23C2/06 ,  C23C2/28 ,  C23C2/40

摘要： Provided is a steel sheet by weight percentage (wt %), carbon (C): 0.005 to 0.08%, manganese (Mn): 1.25% or less (excluding 0%), phosphorus (P): 0.03% or less (excluding 0%), sulfur (S): 0.01% or less (excluding 0%), nitrogen (N): 0.01% or less (excluding 0%), soluble aluminum (sol.Al): 0.01 to 0.06%, chromium (Cr): 1.15 to 2.5%, antimony (Sb): 0.1% or less (excluding 0%), at least one selected from the group consisting of nickel (Ni): 0.3% or less (excluding 0%), silicon (Si): 0.3% or less (excluding 0%), molybdenum (Mo): 0.2% or less (excluding 0%), and boron (B): 0.003% or less (excluding 0%), and a remainder of iron (Fe) and other unavoidable impurities, satisfying Expression 1: 1.3≤Mn(wt %)+Cr(wt %)/1.5+Sb(wt %)≤2.7, where Mn, Cr, and Sb refer to contents (wt %) of corresponding elements, respectively; and 1 to 5% of martensite and a remainder of ferrite by an area percentage (area %).

公开(公告)号：US20230080110A1

公开(公告)日：2023-03-16

申请号：US17992240

申请日：2022-11-22

申请人： POSCO Co., Ltd

发明人： Yeon-Sang AHN ,  Chang-Hyo SEO ,  Kang-Hyun CHOI ,  Eul-Yong CHOI

IPC分类号： C21D9/46 ,  C21D1/26 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/32 ,  C22C38/60 ,  C23C2/06

摘要： Provided is a method of manufacturing a high strength steel sheet having excellent workability, including: reheating a steel slab; hot-rolling the reheated steel slab at an Ar3 transformation point or higher; coiling in a temperature range of 400 to 700° C.; primary cooling at a cooling rate of 0.1° C./s or less to room temperature; producing a cold rolled steel sheet at a cold reduction ratio of 40 to 70%; continuously annealing the cold rolled steel sheet in a temperature range of Ac1+30° C. to Ac3−20° C.; secondary cooling at a cooling rate of 10° C./s or less to 630 to 670° C.; third cooling to 400 to 500° C. at a cooling rate of 5° C./s or more in a hydrogen; maintaining for 70 seconds or more; hot-dip galvanizing; and performing a final cooling to Ms or less at a cooling rate of 1° C./s or more.

公开(公告)号：US20040153196A1

公开(公告)日：2004-08-05

申请号：US10718489

申请日：2003-11-20

申请人： POSCO CO., LTD. ,  TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION

发明人： Cheol-Jae Park ,  Seong-Cheol Hong ,  Kwan-Soo Kim ,  Kyu-Bum Han ,  Young-Jun Jo ,  Seong-Gap Choi ,  Wakamiya Yoshinori ,  Nitta Isoko ,  Inami Haruki

IPC分类号： G06F019/00

CPC分类号： G05B23/0235 ,  B21B37/165

摘要： The present invention relates to an apparatus and method for diagnosing faults in hot strip finishing rolling, which diagnoses thickness faults in hot strip finishing rolling, using preset data and real-time data on rolling and control conditions, equation models representing control and physical phenomena and a database constructed based on operation experiences. The present invention comprises: a Supervisory Control Computer (SCC); an actually measured data collection unit; an exit side thickness gauge loaded-on determination unit; a part identification unit; an on-gauge ratio calculation unit; a primary fault determination unit; a secondary fault determination unit; and a confidence rate evaluation unit.

摘要翻译： 本发明涉及一种用于诊断热轧带钢轧制中的故障的装置和方法，其使用预设数据和轧制和控制条件的实时数据来诊断热轧带钢轧制中的厚度缺陷，表示控制和物理现象的方程模型，以及 基于操作经验构建的数据库。 本发明包括：监控计算机（SCC）; 实际测量的数据收集单元; 出口侧厚度计装载确定单元; 零件识别单元; 标尺比计算单位; 主故障确定单元; 次级故障确定单元; 和置信率评估单元。

公开(公告)号：US20230129303A1

公开(公告)日：2023-04-27

申请号：US18085061

申请日：2022-12-20

申请人： POSCO Co., Ltd

发明人： Hyun-Taek Na ,  Seok-Jong Seo

IPC分类号： C21D9/46 ,  B23K11/00 ,  B23K31/02 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28

摘要： The present invention relates to steel used for a sash component and the like of a vehicle and, more specifically, to a hot-rolled steel sheet for a high-strength electric resistance welded steel pipe having excellent expandability and a method for manufacturing same, the hot-rolled steel sheet having a smaller decrease in the strength of a welding heat-affected zone (HAZ) formed during electric resistance welding, in comparison with a base material.