Posco

Posco Co., Ltd

Tae-Il So

Sang-Deok Kang

Dae-Woo Kim

Il-Cheol Yi

Jae-Young Cho

Hong-Yeol Oh

Jong-In Choi

Ho-Kyung Shim

Chon-Kue Kim

Jae-Yong Chae

One aspect of the present invention is to provide a superior steel plate and a method for manufacturing same, the steel plate, as an ultra-thick steel plate, having high strength as well as superb impact toughness low-temperature, and excellent resistance to formation of cracks.

High-strength ultra-thick steel plate having superb impact toughness at low-temperatures, and method for manufacturing same

The present invention relates to a steel plate which can appropriately be used as a structural material and the like. Provided are a steel plate, exhibiting excellent strength and toughness on a heat affected zone even when high heat input welding is performed, and a method for manufacturing thereof.

Steel plate having excellent heat affected zone toughness and method for manufacturing thereof

An aspect of the present invention provides: a steel for a pressure vessel, the steel having excellent surface quality while having excellent strength and toughness even after a long-term post-weld heat treatment (PWHT); and a method for manufacturing same.

Steel for pressure vessel having excellent surface quality and impact toughness, and method for manufacturing same

An aspect of the present invention relates to a high-strength and high-manganese steel having excellent low-temperature toughness, the high-strength and high-manganese steel comprising, in terms of wt %, 4.3-5.7% of manganese (Mn), 0.015-0.055% of carbon (C), 0.015-0.05% silicon (Si), 0.6-1.7% of aluminum (Al), 0.01-0.1% of niobium (Nb), 0.015-0.055% of titanium (Ti), 0.001-0.005% of boron (B), 0.03% or less of phosphor (P), 0.02% or less of sulfur (S), and the balance iron (Fe) and other inevitable impurities, wherein the microstructure thereof comprises, in terms of percent by volume, 40-60% of martensite and 40-60% of tempered martensite.

High-strength and high-manganese steel having excellent low-temperature toughness and manufacturing method therefor

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Gwangyang-si, South Korea

Tae-Il So