Abstract: Disclosed is a grain-oriented electrical steel sheet that has excellent high-frequency iron loss properties and blanking workability. The steel sheet includes: steel components including, by mass %, Si: 1.5-8.0%, Mn: 0.02-1.0%, and at least one selected from Sn: 0.010-0.400%, Sb: 0.010-0.400%, Mo: 0.010-0.200%, and P: 0.010-0.200%; and crystal grains including coarse secondary recrystallized grains having an average grain size of 5 mm or more and fine grains having a grain size of 0.1-2.0 mm, wherein at least some of the coarse secondary recrystallized grains penetrate the steel sheet in a thickness direction and are respectively exposed on front and back surfaces of the steel sheet such that projection planes of the exposed surfaces of these coarse secondary recrystallized grains on the front and back surfaces form an overlapping region, and the fine grains are present at a number density per unit area of 0.6-40 pieces/cm2.

Abstract: A blade has an attachment root and an airfoil, the airfoil having a proximal end and a distal end. The blade has a compositional variation along the airfoil.

Abstract: The present invention encompasses a method of selectively separating Ga from wastewaters with the aid of a dialysis method. This exploits the particular complexation behaviour of Ga, which forms an unstable tetrahalo complex. This forms only in the case of a sufficiently high halide concentration. Since the halide concentration becomes lower across the membrane, the Ga-tetrahalo complex breaks down in the membrane, as a result of which the Ga is retained. Other metals such as In and Fe do not show this behaviour, and therefore the tetrahalo complexes of these metals can pass through the membrane and hence can be selectively separated off.

Abstract: The present disclosure shows a superplastic-forming aluminum alloy plate that has excellent properties for superplastic-forming, such as blow forming, and that has excellent surface properties after forming. Shown is a superplastic-forming aluminum alloy plate and a production method therefor, the superplastic-forming aluminum alloy plate being characterized by comprising an aluminum alloy which contains 2.0 to 6.0 mass % Mg, 0.5 to 1.8 mass % Mn and 0.40 mass % or less Cr and in which the balance consists of Al and unavoidable impurities, wherein the unavoidable impurities are restricted to have 0.20 mass % or less Fe and 0.20 mass % or less Si, the 0.2% proof stress is 340 MPa or more, and the density of intermetallic compounds having an equivalent circular diameter of 5 to 15 ?m at the RD-TD plane which extends along the center of the plate cross-section is 50 to 400 pieces/mm2.

Abstract: A magnesium alloy includes <3% by weight of Zn, ?0.6% by weight of Ca, with the rest being formed by magnesium containing impurities, which favor electrochemical potential differences and/or promote the formation of intermetallic phases, in a total amount of no more than 0.005% by weight of Fe, Si, Mn, Co, Ni, Cu, Al, Zr and P, wherein the alloy contains elements selected from the group of rare earths with the atomic number 21, 39, 57 to 71 and 89 to 103 in a total amount of no more than 0.002% by weight.

Abstract: The rail having a chemical composition containing C: 0.70-1.00 mass %, Si: 0.50-1.60 mass %, Mn: 0.20-1.00 mass %, P: ?0.035 mass %, S: ?0.012 mass %, Cr: 0.40-1.30 mass %, where Ceq defined by the formula (1) is 1.04-1.25, Ceq=[% C]+([% Si]/11)+([% Mn]/7)+([% Cr]/5.8)??(1) where [% M] is the content in mass % of the element M, the balance being Fe and inevitable impurities, where Ceq(max) is ?1.40, where the Ceq(max) is determined by the formula (2) using maximum contents of C, Si, Mn, and Cr obtained by subjecting a region between specified positions to EPMA line analysis; and a pearlite area ratio in the region is 95% or more, Ceq(max)=[% C(max)]+([% Si(max)]/11)+([% Mn(max)]/7)+([% Cr(max)]/5.8)??(2) where [% M(max)] is the maximum content of the element M.

Abstract: A tailor-welded blank is made of two steels, one steel of Alloy A and one steel of Alloy B. Alloy A comprises 0.10-0.50 wt % C, 0.1-0.5 wt % Si, 2.0-8.0 wt % Mn, 0.0-6.0 wt % Cr, 0.0-2.0 wt % Mo, 0.0-0.15 wt % Ti, and 0.0-0.005 wt % B and wherein Alloy B comprises 0.06-0.12 wt % C, 0.1-0.25 wt % Si, 1.65-2.42 wt % Mn, 0.0-0.70 wt % Cr, 0.08-0.40 wt % Mo, 0.0-0.05 wt % V, and 0.01-0.05 wt % Ti.

Abstract: Provided is a smelting method for producing metal by reducing a mixture that includes an oxide ore such as nickel oxide ore, wherein it is possible to improve productivity by raising the metal recovery rate as well as to inexpensively and efficiently produce high-quality metal. The present invention is a smelting method in which: an oxide ore and a carbonaceous reducing agent are mixed; the resulting mixture is heated and subjected to a reduction treatment; and metal and slag, which are reduction products, are obtained, wherein the reduction treatment is carried out in a state in which one or more surface deposits selected from carbonaceous reducing agents, metal oxides, and oxidation inhibitors are deposited on the surface of the mixture.

Abstract: A process for nickel concentration and extraction from non-sulfidic iron-bearing nickeliferous resources is disclosed. The process includes an atmospheric acid-based leaching treatment of the non-sulfidic iron-bearing nickeliferous resources by oxalic acid to produce a nickel concentrate comprising distinct nickel oxalate particles. The nickel concentrate is technically amenable to further chemical and physical processing to obtain various high-grade nickel products.

Abstract: The present disclosure relates to wear-resistant steel comprising, by weight, carbon (C): 0.19 to 0.28%, silicon (Si): 0.1 to 0.7%, manganese (Mn): 0.6 to 1.6%, phosphorus (P): 0.05% or less, sulfur (S): 0.02% or less, aluminum (Al): 0.07% or less, chromium (Cr): 0.01 to 0.5%, nickel (Ni): 0.01 to 3.0%, copper (Cu): 0.01 to 1.5%, molybdenum (Mo): 0.01 to 0.5%, boron (B): 50 ppm or less, and cobalt (Co): 0.02% or less, further comprising one or more selected from the group consisting of titanium (Ti): 0.02% or less, niobium (Nb): 0.05% or less, vanadium (V): 0.05% or less, and calcium (Ca): 2 to 100 ppm, and comprising a remainder of iron (Fe) and other unavoidable impurities, wherein C, Ni, and Cu satisfy the following relationship 1, wherein a microstructure includes 97 area % or more of martensite: C×Ni×Cu?0.05.??[Relationship 1] .

Abstract: There are provided a high-strength steel sheet excellent in strength, workability in terms of, for example, ?, and energy absorption characteristics, and a production method therefor. The high-strength steel sheet has a specific component composition and a steel microstructure containing, on an area percent basis, 1% to 35% ferrite having an aspect ratio of 2.0 or more, 10% or less ferrite having an aspect ratio of less than 2.0, less than 5% non-recrystallized ferrite, 40% to 80% in total of bainite and martensite containing carbide, 5% to 35% in total of fresh martensite and retained austenite, and 3% to 35% retained austenite, the retained austenite having a C content of 0.40% to 0.70% by mass.

Abstract: Provided are a high-strength cold rolled steel sheet that has a tensile strength of 980 MPa or more, excellent ductility, and a low failure rate in a hole expanding test, and a method for manufacturing the same. A high-strength cold rolled steel sheet comprises a predetermined composition, wherein a total area ratio of ferrite and bainitic ferrite is 20% to 80%, an area ratio of retained austenite (RA) is more than 10% and 40% or less, an area ratio of tempered martensite is more than 0% and 50% or less, a ratio of RA with an aspect ratio of 0.5 or less is 75% or more, a ratio of RA with an aspect ratio of 0.5 or less in ferrite grain boundaries is 50% or more, and an average KAM value of bcc phase is 1° or less.

Abstract: The present disclosure shows a superplastic-forming aluminum alloy plate that has excellent properties for superplastic-forming, such as blow forming, and that has excellent surface properties after forming. Shown is a superplastic-forming aluminum alloy plate and a production method therefor, the superplastic-forming aluminum alloy plate being characterized by comprising an aluminum alloy which contains 2.0 to 6.0 mass % Mg, 0.5 to 1.8 mass % Mn and 0.40 mass % or less Cr and in which the balance consists of Al and unavoidable impurities, wherein the unavoidable impurities are restricted to have 0.20 mass % or less Fe and 0.20 mass % or less Si, the 0.2% proof stress is 340 MPa or more, and the density of intermetallic compounds having an equivalent circular diameter of 5 to 15 ?m at the RD-TD plane which extends along the center of the plate cross-section is 50 to 400 pieces/mm2.

Abstract: Provided is an ultra-high-strength steel sheet having an excellent hole expandability and yield ratio, including, in terms of wt %: 0.05-0.2% of carbon (C); 2.0% or less of silicon (Si); 4.1-9.0% of manganese (Mn); 0.05% or less (excluding 0%) of phosphorus (P); 0.02% or less (excluding 0%) of sulfur (S); 0.5% or less (excluding 0%) of aluminum (Al); 0.02% or less (excluding 0%) of nitrogen (N); and a balance of iron (Fe) and other inevitable impurities, wherein the following Equation 1 is satisfied, and wherein microstructures includes, in volume percentage, 10-30% or retained austenite, 50% or more of annealed martensite, and 20% or less of other phases including alpha martensite and epsilon martensite, Equation 1: C/12+Ti/48+Nb/93+V/51+Mo/96?0.015.

Abstract: A steel sheet for hot stamping use used as a material for a hot stamped article excellent in strength or bending deformability, having a predetermined chemical composition, having a microstructure containing at least one of lower bainite, martensite, and tempered martensite in an area ratio of 90% or more, having an X-ray random intensity ratio of {112}<111> of the crystal grains forming the above lower bainite, martensite, or tempered martensite of 2.8 or more, having a number density of grain size 50 nm or less cementite or epsilon carbides in the microstructure of 1×1016/cm3 or more, and having a grain boundary solid solution ratio Z defined by Z=(mass % of one or both of Nb and Mo at grain boundaries)/(mass % of one or both of Nb and Mo at time of melting) of 0.4 or more.

Abstract: The present invention relates to high-strength high-toughness low-temperature thick-plate structural steel and a heat treatment method thereof. The steel is composed of the following components by weight percentage: C: 0.03-0.08%, Cr: 0.8-1.9%, Mn: 0.01-1.0%, Ni: 3.5-7%, Mo: 0.2-0.5%, V: 0.15-0.2%, Nb: 0.01-0.05%, Cu: 1.2-3.8%, Al: 0-0.5%, P: <0.015%, S: <0.010%, and Fe and inevitable impurities as balance. Compared with the prior art, a steel plate prepared in the present invention can be used at low temperature of ?20 to ?120° C. and ?196° C., maintains relatively high strength and certain toughness, and mainly resolves a technical problem that existing high-strength high-toughness quenched and tempered steel cannot meet equipment requirements in polar resource and energy development; transportation, etc.

Abstract: Provided is a method for producing alloy steel, the method comprising producing first alloy steel in a temperature holding furnace; maintaining the first alloy steel at a temperature of no lower than a melting point in the temperature holding furnace; and producing second alloy steel having an alloy content lower than the alloy content in the first alloy steel by melt mixing of the first alloy steel and molten steel. In the producing of the alloy steel, melting and storing of the ferroalloy are continuously performed, and thus, the temperature drop of the ferroalloy may be suppressed or prevented.

Abstract: A system and method of controlling a metal melting process in a melting furnace, including determining at least one furnace parameter characterizing a melting furnace, adding a charge containing solid metal into the melting furnace, detecting at least one charge parameter characterizing the charge, firing a burner into the melting furnace to provide heat to melt the charge, and exhausting burner combustion products from the furnace, detecting at least one process parameter characterizing progress of melting the charge, calculating a furnace efficiency based on the at least one furnace parameter, calculating a predicted process pour readiness time based on the at least one charge parameter, the at least one process parameter, and the furnace efficiency, and controlling the metal melting process based on the predicted process pour readiness time.

Abstract: An NPR non-magnetic steel material for rock bolt and a production method thereof are disclosed. The NPR non-magnetic steel material for rock bolt has a composition, in weight percent, consisting of: C: 0.4-0.7%, MN: 15-20%, Cr: 1-18%, Si: 0.3-3%, Ca: 0.05-0.15%, Cu: ?0.03%, Ni: ?0.02%, S: ?0.001%, P: ?0.001%, and the rest being Fe and unavoidable impurity elements. The NPR non-magnetic steel material for rock bolt and the production method thereof effectively solve the problems of steel materials for rock bolt in the prior art such as strong magnetism, low tensile strength and low effective elongation. The NPR non-magnetic steel material for rock bolt has a fully-austenitized structure and is non-magnetic, its yield strength is adjustable in the range of 600-1000 MPa, and its elongation is adjustable in the range of 20-60%.

Abstract: An NPR steel material for rock bolt and a production method thereof are disclosed. The NPR steel material for rock bolt has a composition, in weight percent, consisting of: C: 0.4-0.7%, Mn: 15-20%, Si: ?0.1%, Cu: ?0.03%, Cr: ?0.01%, Ni: ?0.02%, S: ?0.001%, P: ?0.001%, and the rest being Fe and unavoidable impurity elements. The NPR steel material for rock bolt and the production method thereof effectively solve the problem that rock bolts in the prior art have low tensile strength and low effective elongation. The NPR steel material for rock bolt has a yield strength adjustable in the range of 500-1100 MPa, and an elongation adjustable in the range of 10-80%.