Posco

Exxonmobil Research and Engineering Company

Posco Co., Ltd

In-Shik Suh

In-Gyu Park

Hong-Ju Lee

Soon-Gi Lee

Hak-Cheol Lee

Jong-Kyo Choi

Yong-Jin Kim

Hee-Goon Noh

Raghavan Ayer

Ning Ma

Sang-Deok Kang

Min-Seo Koo

Hyunwoo Jin

Woo-Gyeom Kim

Russell R Mueller

Ki-Hyun Bang

Young-Hwan Park

Hyun-Kwan Cho

Sang-Ho Kim

Russell Robert Mueller

Improved steel compositions and methods of making the same are provided. The present disclosure provides advantageous wear resistant steel. More particularly, the present disclosure provides high manganese (Mn) steel having enhanced wear resistance, and methods for fabricating high manganese steel compositions having enhanced wear resistance. The advantageous steel compositions/components of the present disclosure improve one or more of the following properties: wear resistance, ductility, crack resistance, erosion resistance, fatigue life, surface hardness, stress corrosion resistance, fatigue resistance, and/or environmental cracking resistance. In general, the present disclosure provides high manganese steels tailored to resist wear and/or erosion.

Enhanced wear resistant steel and methods of making the same

Provided are an austenitic steel having excellent machinability and ultra-low temperature toughness in a weld heat-affected zone including 15 wt % to 35 wt % of manganese (Mn), carbon (C) satisfying 23.6C+Mn&#x2265;28 and 33.5C&#x2212;Mn&#x2264;23, 5 wt % or less (excluding 0 wt %) of copper (Cu), chromium (Cr) satisfying 28.5C+4.4Cr&#x2264;57 (excluding 0 wt %), and iron (Fe) as well as other unavoidable impurities as a remainder, wherein a Charpy impact value of a weld heat-affected zone at &#x2212;196&#xb0; C. is 41 J or more, and a method of manufacturing the steel. According to the present invention, a low-cost ultra-low temperature steel may be obtained, a stable austenite phase may be formed at low temperature, carbide formation may be effectively suppressed, and a structural steel having excellent machinability and ultra-low temperature toughness in a weld heat-affected zone may be provided.

Austenitic steel having excellent machinability and ultra-low temperature toughness in weld heat-affected zone, and method of manufacturing the same

Provided is a steel having excellent weldability and impact toughness in a welding zone comprising: by weight (wt.) %, carbon (C): 0.1% to 0.3%, manganese (Mn): 11% to 13%, iron (Fe) as a residual component thereof, and other inevitable impurities, and positive and negative segregation zones in a layered form. The positive segregation zone comprises austenite and epsilon martensite, and the negative segregation zone comprises, by area fraction, epsilon martensite of less than 5% and alpha martensite.

Steel having excellent weldability and impact toughness of welding zone

The present invention relates to a high strength austenitic-based steel with remarkable toughness of a welding heat-affected zone and a preparation method therefor. One embodiment of the present invention provides: a high strength austenitic-based steel with remarkable toughness of a welding heat-affected zone, comprising 0.8-1.5 wt % of C, 15-22 wt % of Mn, 5 wt % or less of Cr (except 0), and the balance of Fe and other inevitable impurities, and further comprising at least one of the following (a) and (b), wherein the microstructure of a welding heat-affected zone comprises 90% or more of austenite by volume fraction; and a preparation method therefor. (a) Mo: 0.1-1% and B: 0.001-0.02% (b) Ti: 0.01-0.3% and N: 0.003-0.1%.

High strength austenitic-based steel with remarkable toughness of welding heat-affected zone and preparation method therefor

A high-manganese wear-resistant steel having excellent weldability comprises 5 to 15 wt % of Mn, 16&#x2264;33.5C+Mn&#x2264;30 of C, 0.05 to 1.0 wt % of Si, and a balance of Fe and other inevitable impurities. The microstructure thereof includes martensite as a major component, and 5% to 40% of residual austenite by area fraction.

High-manganese wear resistant steel having excellent weldability and method for manufacturing same

There are provided a wear resistant austenitic steel having superior machinability and toughness in weld heat affected zones and a method for producing the austenitic steel. The austenitic steel includes, by weight %, manganese (Mn): 15% to 25%, carbon (C): 0.8% to 1.8%, copper (Cu) satisfying 0.7C-0.56(%)&#x2266;Cu&#x2266;5%, and the balance of iron (Fe) and inevitable impurities, wherein the weld heat affected zones have a Charpy impact value of 100 J or greater at &#x2212;40&#xb0; C. The toughness of the austenitic steel is not decreased in weld heat affected zones because the formation of carbides during welding is suppressed, and the machinability of the austenitic steel is improved so that a cutting process may be easily performed on the austenitic steel. The corrosion resistance of the austenitic steel is improved so that the austenitic steel may be used for an extended period of time in corrosive environments.

Wear resistant austenitic steel having superior machinability and toughness in weld heat affected zones thereof and method for producing same

According to one aspect, provided is a high-strength steel sheet having superior toughness at cryogenic temperature, comprising, in weight percentage, 0.02 to 0.06% of C, 0.1 to 0.35% of Si, 1.0 to 1.6% of Mn, 0.02% or less (but not 0%) of Al, 0.7 to 2.0% of Ni, 0.4 to 0.9% of Cu, 0.003 to 0.015% of Ti, 0.003 to 0.02% of Nb, 0.01% or less of P, 0.005% or less of S, the remainder being Fe and unavoidable impurities, wherein the high-strength steel sheet satisfies the condition of [Mn]+5.4[Si]+26[Al]+32.8[Nb]&#x3c;4.3 where [Mn], [Si], [Al], and [Nb] indicate contents of Mn, Si, Al, and Nb in weight percentage, respectively. The steel sheet secures toughness when used as structural steel materials for ships, offshore structures, or the like, or steel materials for tanks for storing and carrying liquefied gases, which are exposed to an extreme low temperature environment.

High-strength steel sheet having superior toughness at cryogenic temperatures, and method for manufacturing same

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Pohang-si, South Korea

In-Shik Suh