Hyundai Steel Company

Tangjin, South Korea

Hyundai Steel Company

Tangjin, South Korea
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The present invention discloses pulverized coal for iron making comprising cow manure and a method for producing pig iron using the same. The present invention has the advantage of making it possible to improve the combustion properties of pulverized coal and to increase the efficiency and safety of a blast-furnace operation.


A method for surface treatment of a stainless steel separator for a fuel cell, comprising: preparing a stainless steel sheet containing nickel, chrome and iron, and having a passive film on a surface of the stainless steel sheet; and dipping the stainless steel sheet into an etching solution containing sulfuric acid (H2SO4), followed by applying a potential of 0-0.4 V or 0.8-1.0 V (SHE), to selectively lower an amount of Fe in the passive film formed on the surface of the stainless steel sheet, wherein the passive film having the lowered amount of Fe comprises 20-75 wt% Cr and 30 wt% or less Fe.


Patent
Hyundai Motor Company and Hyundai Steel Company | Date: 2017-06-07

A steel composition is provided and includes carbon of about 0.5 to 0.7 wt%; silicon of about 1.3 to 2.3 wt%; manganese of about 0.6 to 1.2 %; chromium of about 0.6 to 1.2 wt%; molybdenum of about 0.1 to 0.5 wt%; nickel of about 0.05 to 0.8 wt%; vanadium of about 0.05 to 0.5 wt%; niobium of about 0.05 to 0.5 wt%; titanium of about 0.05 to 0.3 wt%; cobalt of about 0.01 to 3 wt%; zirconium of about 0.001 to 0.2 wt%; yttrium of about 0.01 to 1.5 wt%; copper of about 0.3 % or less but greater than 0 wt%; aluminum of about 0.3 % or less but greater than 0 wt%; nitrogen of about 0.03 % or less but greater than 0 wt%; oxygen of about 0.003 % or less but greater than 0 wt%. Additionally, a balance iron, based on the total weight is included.


Patent
Hyundai Motor Company and Hyundai Steel Company | Date: 2016-04-05

An ultra-high-strength spring steel, for use as a valve spring steel in a vehicle engine, includes 0.5 to 0.7% by weight of C, 1.2 to 1.5% by weight of Si, 0.6 to 1.2% by weight of Mn, 0.6 to 1.2% by weight of Cr, 0.1 to 0.5% by weight of Mo, 0.05 to 0.8% by weight of Ni, 0.05 to 0.5% by weight of V, 0.05 to 0.5% by weight of Nb, 0.05 to 0.3% by weight of Ti, 0.3% or less by weight of Cu (but not 0%), 0.0001 to 0.3% by weight of Al, 0.03% or less by weight of N (but not 0%), 0.0001 to 0.003% by weight of O, and a remainder of Fe and other unavoidable impurities, based on 100% by weight of the ultrahigh-strength spring steel.


Patent
Hyundai Motor Company and Hyundai Steel Company | Date: 2016-05-17

a coil spring steel which includes: 0.4 to 0.9 wt % of carbon (C); 1.3 to 2.3 wt % of silicon (Si), 0.5 to 1.2 wt % of manganese (Mn); 0.1 to 0.5 wt % of molybdenum (Mo); 0.05 to 0.80 wt % of nickel (Ni); 0.05 to 0.50 wt % of vanadium (V); 0.01 to 0.50 wt % of niobium (Nb); 0.05 to 0.30 wt % of titanium (Ti); 0.6 to 1.2 wt % of chromium (Cr); 0.0001 to 0.3 wt % of aluminum (Al); less than or equal to 0.3 wt % but greater than 0% of copper (Cu); less than or equal to 0.3 wt % but greater than 0% of nitrogen (N); 0.0001 to 0.0030 wt % of oxygen (O); and a balance of iron (Fe) and unavoidable impurities.


Patent
Hyundai Motor Company and Hyundai Steel Company | Date: 2016-06-10

A steel composition is provided and includes carbon of about 0.5 to 0.7 wt %; silicon of about 1.3 to 2.3 wt %; manganese of about 0.6 to 1.2%; chromium of about 0.6 to 1.2 wt %; molybdenum of about 0.1 to 0.5 wt %; nickel of about 0.05 to 0.8 wt %; vanadium of about 0.05 to 0.5 wt %; niobium of about 0.05 to 0.5 wt %; titanium of about 0.05 to 0.3 wt %; cobalt of about 0.01 to 3 wt %; zirconium of about 0.001 to 0.2 wt %; yttrium of about 0.01 to 1.5 wt %; copper of about 0.3% or less but greater than 0 wt %; aluminum of about 0.3% or less but greater than 0 wt %; nitrogen of about 0.03% or less but greater than 0 wt %; oxygen of about 0.003% or less but greater than 0 wt %. Additionally, a balance iron, based on the total weight is included.


Patent
Hyundai Motor Company, Hyundai Steel Company, Korea Institute of Science and Technology | Date: 2016-04-26

An ultra-high-strength spring steel for an engine valve spring steel comprises, by weight: 0.5-0.7% of carbon (C), 1.3-2.3% of silicon (Si), 0.6-1.2% of manganese (Mn), 0.6-1.2% of chrome (Cr), 0.1-0.5% of molybdenum (Mo), 0.05-0.8% of nickel (Ni), 0.05-0.5% of vanadium (V), 0.05-0.5% of niobium (Nb), 0.05-0.3% of titanium (Ti), 0.001-0.01% of boron (B), 0.01-0.52% of tungsten (W), 0.3% or less (0% exclusive) of copper (Cu), 0.3% or less (0% exclusive) of aluminum (Al), 0.03% or less (0% exclusive) of nitrogen (N), 0.003% or less (0% exclusive) of oxygen (O), and a remainder of Fe and other inevitable impurities, based on 100% by weight of the ultra-high-strength spring steel.


Patent
Hyundai Motor Company and Hyundai Steel Company | Date: 2016-05-11

Disclosed are a steel composition and a spring steel comprising the same. The steel composition comprises: an amount of about 0.51 to 0.57% by weight of carbon (C), an amount of about 1.35 to 1.45% by weight of silicon (Si), an amount of about 0.95 to 1.05% by weight of manganese (Mn), an amount of about 0.60 to 0.80% by weight of chromium (Cr), an amount of about 0.25 to 0.35% by weight of copper (Cu), an amount of about 0.05 to 0.15% by weight of vanadium (V), an amount of about 0.25 to 0.35% by weight of nickel (Ni), an amount of about 0.003 to 0.015% by weight of phosphorus (P), an amount of about 0.003 to 0.010% by weight of sulfur (S), and iron (Fe) constituting the remaining balance of the steel composition, all the % by weights are based on the total weight of the steel composition.


Patent
Hyundai Steel Company | Date: 2016-02-03

Disclosed herein are a steel sheet having excellent aging resistance and low yield ratio properties, and a method for producing the same. The disclosed sheet comprises, by weight, 0.005-0.06% carbon (C), 0.2% or less silicon (Si), 1.0-2.0% manganese (Mn), 0.08% or less phosphorus (P), 0.01% or less sulfur (S), 0.2-2.0% aluminum (Al), one or more of chromium (Cr) and molybdenum (Mo) in an amount satisfying 0.3 [Cr wt%]+0.3[Mo wt%] 2.0, and 0.008% or less nitrogen (N), with the remainder being iron (Fe) and inevitable impurities, and has a single-phase structure of ferrite in a hot-rolled state, and a two-phase structure of ferrite and martensite in a cold-rolled state.


Patent
Hyundai Steel Company | Date: 2016-02-03

Disclosed are a steel sheet having excellent and a method for producing the same. The disclosed steel sheet comprises, by weight, 0.005-0.06% carbon (C), 0.2% or less silicon (Si), 1.0-2.0% manganese (Mn), 0.01% or less sulfur (S), 0.2-2.0% aluminum (Al), one or more of chromium (Cr) and molybdenum (Mo) in an amount satisfying 0.3 [Cr wt%]+0.3[Mo wt%] 2.0, and 0.008% or less nitrogen (N), with the remainder being iron (Fe) and inevitable impurities, wherein the density of dislocations in the ferrite matrix of the steel sheet is 1x10^(13)/m^(2) or more.

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