POSCO Patente

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The present disclosure discloses a titanium sheet for a fuel cell separator having excellent surface conductivity and durability. The titanium sheet for a fuel cell separator, comprising: a base metal comprising, by weight percent (wt%), 0.001% to 0.09% of Si, 0.065% or less of Fe, and the balance of Ti and unavoidable impurities; and a surface oxide layer comprising, by weight percent (wt%), 0.20% or less of Si, 0.20% or less of O, and the balance of Ti and unavoidable impurities; wherein the surface oxide layer satisfies Formula (1) at a position where the oxygen (O) content is at its maximum within the surface oxide region, 0.05≤Si/Ti+O≤0.4 where Si, Ti, and 0 in Formula (1) represent the content (wt%) of each respective element at the position.

A wire rod for fastening a wind tower according to an embodiment of the present disclosure includes, in percent by weight (wt%), 0.20 to 0.40% of carbon (C), 0.10 to 0.40% of silicon (Si), 0.30 to 0.50% of manganese (Mn), 1.00 to 1.50% of chromium (Cr), 0.01 to 0.10% of titanium (Ti), 0.0005 to 0.0100% of boron (B), and the remainder of iron (Fe) and other inevitable impurities, wherein a microstructure after hot rolling comprises, by area fraction, 30 to 60% of pearlite and 40 to 70% of ferrite, and satisfies Formula (1) below: 7.50≤12.1xC+1.5xMn+3.1xCr≤8.50 (wherein [C], [Mn], and [Cr] represent percent by weight (wt%) of each element).

The present disclosure relates to a high-strength austenitic stainless steel having excellent low-temperature toughness and a manufacturing method therefor, and more particularly, to an austenitic stainless steel and a manufacturing method therefor, comprising, in percent by weight (wt%), more than 0% and 0.10% or less of carbon (C), more than 0% and 1.5% or less of silicon (Si), 17.0% to 23.0% of chromium (Cr), 5.5% to 12.0% of nickel (Ni), 0.5% to 8.0% of manganese (Mn), 0.10% to 0.30% of nitrogen (N), more than 0% and 1.0% or less of copper (Cu), the remainder of iron (Fe) and inevitable impurities, wherein a content of precipitates is less than 0.001 wt%, and a Ni equivalent value of Formula (1) below is 27 or more.

A wire rod according to the present disclosure comprises, by wt%: C: 1.00% to 1.20%, Si: 1.00% to 1.50%, Mn: 0.10% to 0.50%, Cr: 0.30% to 0.80%, and Al: 0.50% to 1.50%, the balance of Fe and other unavoidable impurities, wherein a microstructure observed at a cross-section of 1/2D to 3/2D (D: diameter) comprises 95% or more of pearlite by area fraction, and 5% or less of massive pro-eutectoid cementite having an average thickness of 1 µm or more in an area of 100 µm<2>.

According to the present disclosure, a steel frame for a photovoltaic module includes a frame member formed by bending a single alloy coated steel sheet and having an insertion part into which a photovoltaic panel is inserted and a hollow part forming a closed cross-section, and the alloy coated steel sheet includes a Mg-Al-Zn-based plating layer on a surface of a steel sheet having a yield strength of 280 to 350 MPa.

The present invention relates to a ferritic stainless steel and a manufacturing method therefor, and more particularly, to a ferritic stainless steel including, in percent by weight (wt%), 0.0005 to 0.0200% of carbon (C), 0.005 to 0.020% of nitrogen (N), 0.01 to 2.00% of silicon (Si), 0.01 to 1.00% of manganese (Mn), 0.001 to 0.050% of phosphorus (P), 13 to 25% of chromium (Cr), 0.01 to 2.00% of copper (Cu), 0.05 to 0.50% of titanium (Ti), and the balance of iron (Fe) and inevitable impurities, and satisfying Formula (1) below. 7×Si+4×Cu+0.2×Cr≥10 (wherein [Si], [Cu], and [Cr] represent amounts (wt%) of respective elements)

A camber adjustment device of a prefabricated truss bridge and a prefabricated truss bridge having the same are disclosed. According to an aspect of the present disclosure, there can be provided a camber adjustment device of a prefabricated truss bridge formed by assembling truss panels composed of an upper chord member, a lower chord member, a vertical member, and a diagonal member in one direction, the camber adjustment device comprising a connection member provided at both ends of the upper chord member and the lower chord member, respectively, to connect the upper chord member and the lower chord member with an adjacent upper chord member and lower chord member, wherein the connection member is provided to be length-adjustable from both ends of the upper chord member and the lower chord member, respectively, by a length adjusting means.

The present disclosure relates to an austenitic stainless steel having excellent formability, the austenitic stainless steel comprising, in percent by weight (wt%): C: 0.005% to 0.100%, Si: 0.10% to 1.00%, Mn: 0.10% to 2.00%, Ni: 6.00% to 12.00%, Cr: 16.00% to 20.00%, Mo: more than 0% and 0.20% or less, Cu: more than 0% and 0.50% or less, N: 0.010% to 0.100%, and the balance of Fe and other unavoidable impurities, and satisfying Formula (1) below. 454−440×C+N−8×Mn−12×Cr−23×Ni−45×Mo≥0 wherein C, N, Mn, Cr, Ni, and Mo mean the weight% of each element

Disclosed are an electrode material for a self-baking electrode and a manufacturing method therefor. A method for manufacturing an electrode material for a self-baking electrode according to an embodiment may include: preparing an aggregate containing carbon as a main component; coating an oxidation inhibitor on a surface and internal pores of the prepared aggregate; mixing the oxidation-inhibitor-treated aggregate with a binder pitch; and molding a mixture, in which the carbon aggregate and the binder pitch are mixed, into a predetermined shape.

The present disclosure relates to a martensitic stainless steel and a method for manufacturing the same. According to an embodiment of the present invention, the martensitic stainless steel comprises, in weight %, C: 0.40% to 0.55%, N: 0.01% to 0.05%, Si: 0.10% to 0.80%, Mn: 0.20% to 0.80%, Cr: 13.0% to 15.5%, Ni: 0.01% to 0.50%, and Ti: 0.001% to 0.020%, with the balance being Fe and unavoidable impurities, wherein the following Formula (1) is satisfied, and the number of pores inside a cold-rolled annealed material is in a range of 1 * 10<4> to 50 * 10<4> ea/mm<2>: 80 ≤ 3 Cr + 17 Si + 100 C − 400 Ti ≤ 105 <img class="EMIRef" id="1073db24-9d89-4213-9543-04bc4e9aa59d-ia01" /> (wherein [Cr], [Si], [C], and [Ti] represent the content of each element)

A wire rod according to an example of the present disclosure comprises, in percent by weight (wt%)in percent by weight (wt%): C: 0.94% to 1.04%, Si: 0.9% to 1.5%, Mn: 0.2% to 0.8%, Cr: 0.2% to 0.8%, Al: 0.020% to 0.105%, N: 0.0021% to 0.0205%, Al/N: 2.00 to 11.00, the balance of Fe and other unavoidable impurities.A manufacturing method of a wire rod according to another example of the present disclosure comprises: preparing a billet comprising, in percent by weight (wt%): C: 0.94% to 1.04%, Si: 0.9% to 1.5%, Mn: 0.2% to 0.8%, Cr: 0.2% to 0.8%, Al: 0.021% to 0.102%, N: 0.0021% to 0.0205%, Al/N: 2.00 to 11.00, and the balance of Fe and other unavoidable impurities; reheating and hot-rolling the billet; coiling at Acm-80°C to 760°C; cooling from the coiling temperature to 650°C to 620°C, which is a pearlite transformation entry temperature, at 10°C/s to 20°C/s; and maintaining for 200 seconds or more by setting a conveyor speed to 0.30 m/s or less from the cooling temperature to a temperature range of 600°C to 560°C.

A wire rod according to an embodiment of the present disclosure includes, in percent by weight (wt%), 0.20 to 0.35% of carbon (C), 0.05 to 0.50% of silicon (Si), 0.30 to 0.60% of manganese (Mn), 1.00 to 1.60% of chromium (Cr), 0.02 to 0.10% of aluminum (Al), 0.02 to 0.05% of titanium (Ti), and 0.0005 to 0.0100% of boron (B), the remainder of iron (Fe) and inevitable impurities, satisfies Formula (1) below, and includes 30% to 60% of pearlite and 40% to 70% of ferrite in an area fraction as a microstructure after hot rolling. 5.9 ≤ 9.2 x C + 1.2 x 0.9 x Mn + 2.1 x Cr ≤ 6.3 <img class="EMIRef" id="99439e33-2daa-42b9-abc4-8c7829880479-ia01" /> (Where, [C], [Mn], and [Cr] refer to the weight percent of each element).

A tube for a transportation system is disclosed. A tube for a transportation system according to an embodiment may include: a tube body provided as a rectangular steel pipe to provide a traveling path for a traveling body traveling under a pressure condition lower than atmospheric pressure; a plurality of skin panels coupled to respective sides of a circumference of the tube body by having a curvature to form an arch shape; and a panel reinforcement member coupled to an inner surface of the skin panel.

The present disclosure relates to a wire rod and a steel wire with excellent hydrogen embrittlement resistance, and manufacturing methods therefor, and more particularly, to a wire rod with excellent hydrogen embrittlement resistance, comprising, in percent by weight (wt%), 0.20 to 0.40% of carbon (C), 0.20 to 0.50% of silicon (Si), 0.50 to 1.00% of manganese (Mn), 0.050 to 0.100% of titanium (Ti), 0.030 to 0.080% of sulfur (S), and the remainder of iron (Fe) and other inevitable impurities, wherein an atomic ratio of Ti to S (Ti/S) satisfies Formula (1) below, and when a radius of the wire rod is D, a microstructure in a region of 1/2D to 3/2D of a cross section of the wire rod comprises 20 to 30% of ferrite and residual pearlite in area fraction.0.5 ≤ [(Ti content (wt%)) / (atomic weight of Ti)] / [(S content (wt%)) / (atomic weight of S)] ≤ 1.8

The present disclosure provides an austenitic stainless steel and a method for manufacturing the same having excellent resistance to hydrogen embrittlement and cryogenic impact toughness, comprising, in weight percent (wt%): C: more than 0 to 0.05 wt% or less; Si: greater than 0 to 1.0 wt% or less; Mn: greater than 0 to 5.0 wt% or less; Cr: 16.0 to 25.0 wt%; Mo: greater than 0 to 2.5 wt% or less; Ni: 7.0 to 14.0 wt%; Cu: greater than 0 to 1.0 wt% or less; N: 0.05 to 0.28 wt%; and the balance of Fe and other inevitable impurities, wherein a following α value satisfies 30.0 or more, wherein an average delta ferrite area fraction in a region excluding a 1/4t region from a surface in a thickness direction is 3% or less, and wherein a density of delta ferrites having a major axis length of 50 µm or more is 0.04 pieces/cm² or less. α=Ni+0.65Cr+0.98Mo+1.05Mn+0.35Si+12.6C+33.6N≥30.0 (wherein Ni, Cr, Mo, Mn, Si, C, and N represent the content (wt%) of each element)

The present disclosure relates to a ferritic stainless steel and a method for manufacturing the same, and more specifically, to a ferritic stainless steel comprising, based on a total weight of the ferritic stainless steel: C: 0.0030 to 0.0200 %, N: 0.0030 to 0.0200 %, Si: 0.05 to 0.50 %, Mn: 0.10 to 1.50 %, Cr: 19.0 to 25.0 %, Mo: 0.01 to 2.00 %, Nb: 0.05 to 1.00 %, Ti: 0.010 to 0.200 %, the balance being Fe and inevitable impurities, and satisfying the following Formula (1). 240.00≤Cr/Mn×10×Nb+Mo≤520.00 (wherein Cr, Mn, Nb, and Mo represent the content (wt%) of each element)

According to the present invention, an uncoated austenitic steel sheet for an alkaline water electrolysis separator is provided, comprising, by wt%: C: more than 0% and 0.04% or less, Si: more than 0% and 0.4% or less, Mn: more than 0% and 0.5% or less, Cr: more than 0% and 2.0% or less, Ni: 33% to 40%, Co: more than 0% and 4.0% or less, the balance of Fe and other inevitable impurities, wherein a value of the following Formula (1) is 0.83 or less, a surface roughness Ra value is 0.07 µm to 0.25 µm, and corrosion resistance is excellent in an alkaline environment. 9.0 − 0.2495 × Ni + 0.9 × Cr − 0.005 × Co <img class="EMIRef" id="a03970a2-5509-439e-9998-176efacf3129-ia01" /> (wherein Ni, Cr and Co represent the content (wt%) of each element).

The present disclosure relates to a method for manufacturing a high-strength stainless steel with excellent formability, and more specifically, to a stainless steel and a method for manufacturing the same, the stainless steel comprising, in percent by weight (wt%): C: 0.01% to 0.10%, N: 0.01% to 0.10%, Si: 0.01% to 1.00%, Mn: 0.01% to 3.00%, Cr: 10.0% to 20.0%, Al: 0.001% to 1.000%, and the balance of Fe and other unavoidable impurities, wherein a microstructure is a dual phase of a ferrite phase and a martensite phase, wherein a yield strength at room temperature is 350 MPa or more, and a tensile strength at room temperature is 500 MPa or more, and wherein an R-bar value of Formula (1) below is 1.0 or more. R-bar=R0+2×R45+R90/4 (wherein R0 is an R value in a direction parallel to a rolling direction, R45 is an R value in a 45-degree direction to the rolling direction, and R90 is an R value in a 90-degree direction to the rolling direction)

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