Abstract: The present invention relates to high-nitrogen duplex stainless steels with an excellent eco-index and pitting corrosion resistance, in particular, to providing duplex stainless steels with ferrite-austenite phases, including: 16.5-19.5 wt. % of chromium (Cr), 2.3-3.5 wt. % of molybdenum (Mo), 1.0-5.5 wt. % of tungsten (W), 5.5-7.0 wt. % of manganese (Mn), 0.35-0.45 wt. % of nitrogen (N), with a remainder of iron (Fe). The high nitrogen duplex stainless steels with excellent eco-index and pitting corrosion resistance according to the present invention use manganese (Mn) and nitrogen (N) to exclude or mostly substitute Ni, which increases price instability of the steel grades and environment burden, to result in enhancing economic efficiency, price stability and eco-friendliness.

Abstract: An air hardenable steel alloy is disclosed comprising, in percent by weight: 0.18 to 0.26 carbon; 3.50 to 4.00 nickel; 1.60 to 2.00 chromium; 0 to 0.50 molybdenum; 0.80 to 1.20 manganese; 0.25 to 0.45 silicon; 0 to less than 0.005 titanium; 0 to less than 0.020 phosphorus; 0 up to 0.005 boron; 0 up to 0.003 sulfur; iron; and impurities. The air hardenable steel alloy has a Brinell hardness in a range of 352 HBW to 460 HBW. The air hardenable steel alloy combines high strength, medium hardness and toughness, as compared with certain known air hardenable steel alloys, and finds application in, for example, any of a steel armor, a blast-protective hull, a blast-protective V-shaped hull, a blast-protective vehicle underbelly, and a blast-protective enclosure.

Abstract: A silicon steel sheet (1) containing Si is cold-rolled. Next, a decarburization annealing (3) of the silicon steel sheet (1) is performed so as to cause a primary recrystallization. Next, the silicon steel sheet (1) is coiled so as to obtain a steel sheet coil (31). Next, an annealing (6) of the steel sheet coil (31) is performed through batch processing so as to cause a secondary recrystallization. Next, the steel sheet coil (31) is uncoiled and flattened. Between the cold-rolling and the obtaining the steel sheet coil (31), a laser beam is irradiated a plurality of times at predetermined intervals on a surface of the silicon steel sheet (1) from one end to the other end of the silicon steel sheet (1) along a sheet width direction (2). When the secondary recrystallization is caused, grain boundaries passing from a front surface to a rear surface of the silicon steel sheet (1) along paths of the laser beams are generated.

Abstract: To obtain an Al—Mg—Si based aluminum alloy extruded material with a smooth surface and no burning without inhibiting the productivity. An aluminum alloy billet includes: Si: 2.0 to 6.0% by mass; Mg: 0.3 to 1.2% by mass; and Ti: 0.01 to 0.2% by mass, a Fe content being restricted to 0.2% or less by mass, with the balance being Al and inevitable impurities. The aluminum alloy billet is subjected to a homogenization treatment by keeping at 500 to 550° C. for 4 to 15 hours. The billet is forcibly cooled to 250° C. or lower at an average cooling rate of 50° C./hr or higher. Then, the billet is subjected to hot-extruding at an extrusion rate of 3 to 10 m/min by being heating at 450 to 500° C. The extruded material is forcibly cooled at an average cooling rate of 50° C./sec or higher and then subjected to an aging treatment. The extruded material can be manufactured that has its surface having a ten-point average roughness Rz of 80 ?m or less.

Abstract: A monolithic titanium alloy having, in a temperature range (?T) and at atmospheric pressure: an outer peripheral zone of a microstructure having a modulus of elasticity (E1) and possessing superelastic properties in the range (?T), and a core of a microstructure having a modulus of elasticity (E2), and possessing elastic properties in the range (?T); the microstructures and being different from one another, and the modulus of elasticity (E1) being lower than said modulus of elasticity (E2).

Abstract: A swash plate includes aluminum (Al) as a main component and 35˜45 wt % of zinc (Zn), 1.5˜3.5 wt % of copper (Cu), 6˜10 wt % of silicon (Si), 0.2˜0.5 wt % of magnesium (Mg) and other inevitable impurities. A method of manufacturing the swash plate is also provided.

Abstract: The present invention relates to a gray gold alloy free of nickel and copper having a hardness that is suitable in particular for watchmakers and jewellers. Said alloy consists of (in wt %): more than 75% of Au; more than 18% to less than 24% of Pd; more than 1% to less than 6% of at least one element selected from among Mn, Hf, Nb, Pt, Ta, V, Zn and Zr; optionally, no more than 0.5% of at least one element selected from among Si, Ga and Ti; and optionally, no more than 0.2% of at least one element selected from among Ru, Ir and Re. The invention also relates to a method for preparing said alloy.

Abstract: A surface treatment method for a metal material is provided which includes applying diluted sulfuric acid to a surface of the metal material that is composed primarily of iron, performing a heat treatment on the metal material in the presence of at least one of CO, CO2 and organic gas under nitriding conditions under which a nitrided layer is formed in a superficial layer of the metal material after the application of the diluted sulfuric acid to form a carbon film which includes at least one of carbon nanocoils, carbon nanotubes and carbon nanofilaments on a surface of the nitrided layer of the metal material.

Abstract: An alloy according to example embodiments of the present invention may include zirconium, tin, iron, chromium, and nickel, with a majority of the alloy being zirconium. The composition of the alloy may be about 0.85-2.00% tin by weight, about 0.15-0.30% iron by weight, about 0.40-0.75% chromium by weight, and less than 0.01% nickel by weight. The alloy may further include 0.004-0.020% silicon by weight, 0.004-0.020% carbon by weight, and/or 0.05-0.20% oxygen by weight. Accordingly, the alloy exhibits reduced hydrogen absorption and improved corrosion resistance and may be used to form a fuel assembly component.

Abstract: An alpha-beta Ti alloy having improved mechanical and ballistic properties formed using a low-cost composition is disclosed. In one embodiment, the Ti alloy composition, in weight percent, is 4.2 to 5.4% aluminum, 2.5 to 3.5% vanadium, 0.5 to 0.7% iron, 0.15 to 0.19% oxygen and balance titanium. The exemplary Ti alloy exhibits a tensile yield strength of at least about 120,000 psi and an ultimate tensile strength of at least about 128,000 psi in both longitudinal and transverse directions, a reduction in area of at least about 43%, an elongation of at least about 12% and about a 0.430-inch-thick plate has a V50 ballistic limit of about 1936 fps. The Ti alloy may be manufactured using a combination of recycled and/or virgin materials, thereby providing a low-cost route to the formation of high-quality armor plate for use in military systems.

Abstract: Alloys, processes for preparing the alloys, and manufactured articles including the alloys are described. The alloys include, by weight, about 10% to about 20% chromium, about 4% to about 7% titanium, about 1% to about 3% vanadium, 0% to about 10% iron, less than about 3% nickel, 0% to about 10% tungsten, less than about 1% molybdenum, and the balance of weight percent including cobalt and incidental elements and impurities.

Abstract: A steel sheet has a microstructure including ferrite phase: 40% to 60%, bainite phase: 10% to 30%, tempered martensite phase: 20% to 40%, and retained austenite phase: 5% to 20% by volume fraction, and satisfying a condition that a ratio of tempered martensite phase having major axis length ?5 ?m to a total volume fraction of the tempered martensite phase is 80% to 100%.

Abstract: An extrudable aluminum alloy composition includes, in weight percent, between 0.60 and 0.90 manganese, between 0.45 and 0.75 copper, between 0.05 and 0.24 magnesium, less than 0.30 iron, less than 0.30 silicon, less than 0.05 titanium, less than 0.05 vanadium, and a Cu/Mg ratio higher or equal to 3. It also relates to aluminum alloy heat exchanger extruded or drawn tube and extruded or drawn aluminum alloy tubing having the above-described aluminum alloy composition. It also relates to a heat exchanger comprising a plurality of extruded or drawn tube sections having the above-described aluminum alloy composition and a process for manufacturing same.

Abstract: A bearing component having increased rolling-contact fatigue life, the bearing component being made of a bearing steel that satisfies a predetermined chemical composition, and Si (boundary Si), Mn (boundary Mn), Cr (boundary Cr), Cu (boundary Cu), Ni (boundary Ni), and Mo (boundary Mo) included in a matrix phase region (boundary surface region) from the surface of spheroidized cementite to 20 nm away satisfy the formula: 9.0?1.4×boundary Si+1.8×boundary Mn+5.5×boundary Cu+4.2×boundary Ni+4.8×boundary Cr+5.5×boundary Mo.

Abstract: Provided is an Al alloy film for display devices, which has excellent heat resistance under high temperatures, low electric resistance (wiring resistance), and excellent corrosion resistance under alkaline environments. The present invention relates to an Al alloy film containing Ge (0.01-2.0 at. %) and a group X element (Ta, Ti, Zr, Hf, W, Cr, Nb, Mo, Ir, Pt, Re, and/or Os), wherein, with regard to precipitates each containing Al, the group X element and Ge generated when a heat treatment at 450 to 600° C. is carried out, the density of some of the precipitates which have equivalent circle diameters of 50 nm or more is controlled.

Abstract: In a method for producing a grain-oriented electrical steel sheet by comprising a series of steps of hot rolling a raw steel material containing C: 0.002-0.10 mass %, Si: 2.0-8.0 mass % and Mn: 0.005-1.0 mass % to obtain a hot rolled sheet, subjecting the hot rolled steel sheet after or without hot band annealing to one stage cold rolling or two or more stage cold rollings including an intermediate annealing therebetween to obtain a cold rolled sheet having a final sheet thickness, subjecting the cold rolled sheet to decarburization annealing combined with primary recrystallization annealing, applying an annealing separator to the steel sheet surface and then subjecting to a final annealing, when rapid heating is performed at a rate of not less than 50° C./s in a range of 200-700° C. of the decarburization annealing, the cold rolled sheet is subjected to holding at any temperature of 250-600° C.

Abstract: An aspect of a ferritic stainless steel contains, by mass %: C: 0.03% or less; N: 0.03% or less; Si: more than 0.1% to 1% or less; Mn: 0.02% to 1.2%; Cr: 15% to 23%; Al: 0.002% to 0.5%; and either one or both of Nb and Ti, with the remainder being Fe and unavoidable impurities, wherein Expression (1) and Expression (2) illustrated below are satisfied, an oxide film is formed on a surface thereof, and the oxide film contains Cr, Si, Nb, Ti and Al in a total cationic fraction of 30% or more, 8(C+N)+0.03?Nb+Ti?0.6??(1) Si+Cr+Al+{Nb+Ti?8(C+N)}?15.5??(2).

Abstract: A steel sheet according to the present invention has tensile strength of 980 MPa or more, exerts a high-yield ratio, and has excellent workability (in detail, strength-ductility balance). The steel sheet contains: C: 0.06-0.12% (excluding 0.12%); Si: 0.2% or less; Mn: 2.0-3.5%; at least one element selected from the group consisting of Ti, Nb, and V of 0.01-0.15% in total; B: 0.0003-0.005%; P: 0.05% or less; S: 0.05% or less; Al: 0.005-0.1%; N: 0.015% or less; and the balance is iron and unavoidable impurities, in which the content of ferrite is more than 5% to 15% or less, that of martensite is 25-55%, and the total content of bainite and tempered martensite is 30% or more to less than 70%, based on the whole microstructure, and in which the average crystal grain size of the ferrite is 3.0 ?m or less.

Abstract: A method for producing a sintered R-T-B based magnet includes providing a sintered R-T-B based magnet body, where T is mostly Fe; providing an RH diffusion source that includes 0.2 mass % to 18 mass % of a light rare-earth element RL; 40 mass % to 70 mass % of Fe; and a heavy rare-earth element RH as the balance; and performing an RH diffusion process by loading the sintered R-T-B based magnet body, a stirring aid member, and the RH diffusion source into a chamber, and by heating the sintered R-T-B based magnet body, the stirring aid member, and the RH diffusion source to a temperature of 700° C. to 1000° C. while rotating or rocking the chamber. The Fe/RH ratio is within a range from two to seven and is defined by a mass fraction of Fe when a mass fraction of the heavy rare-earth element RH in the RH diffusion sources is three.

Abstract: The invention relates to a steel part coated with a compound consisting, over more than 90% of its thickness, of at least one Fe/Zn-based phase, the iron weight content of which is equal to 65% or higher and the Fe/Zn ratio of which is between 1.9 and 4, said compound being formed by at least one heat treatment for alloying between said steel and a precoat, said precoat consisting of a zinc alloy comprising, the contents being expressed by weight, between 0.5 and 2.5% aluminum and, optionally, one or more elements chosen from: Pb?0.003%; Sb?0.003%; Bi?0.003%; 0.002%?Si?0.070%; La<0.05%; Ce<0.05%, the balance consisting of zinc and inevitable impurities.