Hyundai Steel Company

Industry-university Cooperation Foundation Hanyang University

Koh Young Technology Inc.

Byung Gil Yoo

Chee Woong Song

Hyeong Hyeop Do

Soon Geun Jang

Do Hak Kim

Young Mun Shin

Sang Mun Hong

Seung Jun Lee

Min Young Kim

Hye Jin Kim

Hee Tae Kim

Je Youl Kong

Ho Bum Park

Hyo Won Kim

Sung Yul Huh

Seung Chae Yoon

Seung Ha Lee

Hee Wook Yoon

Se Hyun Han

Young Chul Park

Hyeong-Hyeop Do

Wan Yook

Jeong Hwan Jang

Hee Joong Lim

Gi Hak Yim

Ji Young Kim

Je Woo Soo Kim

Seong Kyung Han

Dong Yong Kim

A steel sheet for hot press comprises carbon (C) in an amount of 0.03 to 0.15 wt %, silicon (Si) in an amount of 0.1 to 1.5 wt %, manganese (Mn) in an amount of 1.0 to 2.0 wt %, phosphorus (P) in an amount of 0.1 wt % or less, sulfur (S) in an amount of 0.01 wt % or less, boron (B) in an amount of 0.0005 to 0.005 wt %, a sum of one or more of titanium (Ti), niobium (Nb), and vanadium (V) in an amount of 0.01 to 1.0 wt %, chromium (Cr) in an amount of 0.01 to 0.5 wt %, the balance of iron (Fe), and other unavoidable impurities. The steel sheet for hot press includes MnS-based inclusions, and an area fraction of the MnS-based inclusions is 5% or less.

Steel sheet for hot press and aluminum coated blank manufactured using the same

In accordance with one aspect of the present disclosure, there is provided a steel material for a tailor-welded blank, including 0.04 to 0.06 wt % of carbon (C), 1.2 to 1.5 wt % of manganese (Mn), 0.01 to 0.10 wt % of titanium (Ti), 0.01 to 0.10 wt % of niobium (Nb), and the balance of iron (Fe) and inevitable impurities; having a tensile strength (TS) of 550 MPa or greater, a yield strength (YS) of 300 MPa or greater, and an elongation (EL) of 20% or greater; and having a dual-phase structure of ferrite and martensite.

Steel material for taylor welded blank and method for manufacturing hot-stamped part using same steel

A hot-stamped part according to an embodiment of the present invention comprises, as a base layer, a steel comprising: 0.28-0.38 wt % of carbon (C); 0.1-0.4 wt % of silicon (Si); 1.2-2.0 wt % of manganese (Mn); from greater than 0 to 0.020 wt % of phosphorus (P); from greater than 0 to 0.003 wt % of sulfur (S); 0.1-0.5 wt % of chromium (Cr); 0.0015-0.0040 wt % of boron (B); 0.025-0.05 wt % of titanium (Ti); and the remainder of iron (Fe) and inevitable impurities, wherein the microstructure of the base layer is full martensite.

Hot-stamped part and manufacturing method therefor

A method for producing a molded article includes the steps of: preparing a first steel plate and a second steel plate. The first steel plate and the second steel plate are joined to each other, thereby preparing a joined steel plate. The joined steel plate is heated at a temperature between 910&#xb0; C. and 950&#xb0; C. The heated joined steel plate is then subjected to hot-press molding, thereby preparing an intermediate molded article; and cooling the intermediate molded article, wherein the first steel plate has a tensile strength (TS) higher than that of the second steel plate.

Molded body manufacturing method

A method for manufacturing a hot-stamped part includes reheating a steel slab at a temperature of 1,200&#xb0; C. to 1,250&#xb0; C., the steel slab including, by wt %, 0.20 to 0.50% carbon (C), 0.05 to 1.00% silicon (Si), 0.10 to 2.50% manganese (Mn), more than 0% and not more than 0.015% phosphorus (P), more than 0% and not more than 0.005% sulfur (S), 0.05 to 1.00% chromium (Cr), 0.001 to 0.009% boron (B), 0.01 to 0.09% titanium (Ti), and a balance of iron (Fe) and inevitable impurities; finish-rolling the reheated steel slab at a temperature of 880&#xb0; C. to 950&#xb0; C.; cooling the hot-rolled steel plate without using water, and coiling the cooled steel plate at a temperature of 680&#xb0; C. to 800&#xb0; C. to form a hot-rolled decarburized layer on a surface of the steel plate; pickling the coiled steel plate, followed by cold rolling; annealing the cold-rolled steel plate in a reducing atmosphere; plating the annealed steel plate; and hot-stamping the plated steel plate.

Hot-stamped part and method for manufacturing same

The present invention relates to a composite separation membrane that is applicable to carbon dioxide separation and recovery processes. The composite separation membrane includes a coating layer composed of graphene oxide and a bile acid or its salt on a porous polymer support. The composite separation membrane of the present invention, which includes a coating layer composed of graphene oxide and a bile acid or its salt, has both high carbon dioxide permeability and high selectivity for carbon dioxide over nitrogen, hydrogen or methane gas, is free of surface defects, and maintains a stable structure without deterioration of its performance even after long-term use. Due to these advantages, the composite separation membrane of the present invention can be applied to industrial fields involving carbon dioxide separation and recovery processes. The present invention also relates to a method for manufacturing the composite separation membrane.

Composite separation membrane including coating layer of graphene oxide/bile acid or salt thereof and method for manufacturing the same

A method of measuring a 3D shape includes the steps of measuring a brightness of a first illumination source, measuring a phase-to-height conversion factor, measuring a 3D shape of a circuit boardaccording to the normal inspection mode, and determining whether bare board information about the circuit boardis included. If the information is not included, performing bare board teaching to acquire the information. Then, the 3D shape of target objects on the circuit boardare measured, when the bare board information is included or bare board teaching information is generated. Next, the circuit boardis analyzed to determine if it is normal or abnormal by using 3D shape information.

Method for automated measurement of three-dimensional shape of circuit boards

Growing community of inventors

Seoul, South Korea

Byung Gil Yoo