Abstract: A case hardening steel material having a chemical composition consists of, by mass percent, C: 0.15 to 0.23%, Si: 0.01 to 0.15%, Mn: 0.65 to 0.90%, S: 0.010 to 0.030%, Cr: 1.65 to 1.80%, Al: 0.015 to 0.060%, and N: 0.0100 to 0.0250%, further containing, as necessary, one or more kinds selected from Cu and Ni of predetermined amounts, the balance being Fe and impurities; 25?Mn/S?85, 0.90?Cr/(Si+2Mn)?1.20, and 1.16Si+0.70Mn+Cr?2.20; P, Ti and O in the impurities being P?0.020%, Ti?0.005%, and O?0.0015%; and having a structure consisting of 20 to 70% in an area ratio being ferrite; and the portion other than the ferrite being one or more kinds of pearlite and bainite. The steel material is used suitably as a raw material of the carburized part such as a CVT pulley shaft.

Abstract: An aluminum alloy wire rod has a composition consisting of Mg: 0.10 to 1.00 mass %, Si: 0.10 to 1.00 mass %, Fe: 0.01 to 1.40 mass %, Ti: 0.000 to 0.100 mass %, B: 0.000 to 0.030 mass %, Cu: 0.00 to 1.00 mass %, Ag: 0.00 to 0.50 mass %, Au: 0.00 to 0.50 mass %, Mn: 0.00 to 1.00 mass %, Cr: 0.00 to 1.00 mass %, Zr: 0.00 to 0.50 mass %, Hf: 0.00 to 0.50 mass %, V: 0.00 to 0.50 mass %, Sc: 0.00 to 0.50 mass %, Co: 0.00 to 0.50 mass %, Ni: 0.00 to 0.50 mass %, and the balance: Al and incidental impurities. A dispersion density of compound particles having a size of 20-1000 nm is 1 particle/?m2 or higher. In a distribution of the compound particles in the aluminum alloy wire rod, a maximum dispersion density of the compound particles is less than or equal to five times a minimum dispersion density of the compound particles.

Abstract: A ferritic stainless steel sheet having ridging resistance contains, by mass, 0.025 to 0.30% C, 0.01 to 1.00% Si, 0.01 to 2.00% Mn, 0.050% or less P, 0.020% or less S, 11.0 to 22.0% Cr, and 0.022 to 0.10% N. In addition, Ap, which is defined as 420C+470N+23Ni+9Cu+7Mn?11.5(Cr+Si)?12Mo?52Al?47Nb?49Ti+189 wherein each of Sn, C, N, Ni, Cu, Mn, Cr, Si, Mo, Al, Nb, and Ti denotes the content of the element, satisfies 10?Ap?70. Furthermore, a content of Sn satisfies 0.060?Sn?0.634?0.0082Ap. Residual ingredients are Fe and unavoidable impurities, and a metal structure of the steel sheet is a ferrite single phase. The ferritic stainless steel sheet has a ridging height of less than 6 ?m. This ferritic stainless steel sheet improves the corrosion resistance and rust resistance of Cr-containing ferritic stainless steel as well as the ridging resistance.

Abstract: An aluminum alloy that can be cast into structural components wherein the alloy has reduced casting porosity, improved combination of mechanical properties including tensile strength, fatigue, ductility in the cast condition and in the heat treated condition.

Abstract: A heat-resistant, austenitic cast steel having excellent machinability comprising by mass 0.4-0.55% of C, 1-2% of Si, 0.5-1.5% of Mn, 18-27% of Cr, 8-22% of Ni, 1.5-2.5% of Nb, 0.01-0.3% of N, 0.1-0.2% of S, and 0.02-0.15% of Al, the balance being Fe and inevitable impurities, a machinability index I represented by the following formula: I=100×S+75×Al+0.75×Mn?10×C?2×Nb?0.25×Cr?0.15×Ni?1.2×N, wherein each element symbol represents % by mass of each element in the cast steel, meeting the condition of ?3.0?I?+14.0, and an exhaust member made thereof.

Abstract: Provided is a hot-rolled steel sheet having a composition containing 0.04 mass percent to 0.20 mass percent C, 0.7 mass percent to 2.3 mass percent Si, 0.8 mass percent to 2.8 mass percent Mn, 0.1 mass percent or less P, 0.01 mass percent or less S, 0.1 mass percent or less Al, and 0.008 mass percent or less N, the remainder being Fe and inevitable impurities. Internal oxides containing one or more selected from the group consisting of Si, Mn, and Fe are present at grain boundaries and in grains in a base metal. The internal oxides present at the grain boundaries in the base metal are located within 5 ?m from the surface of the base metal. The difference between the depths at which the internal oxides are formed in the cross direction of the steel sheet is 2 ?m or less.

Abstract: A grain-oriented electrical steel sheet produces reduced noise when worked into a transformer, by setting length d of each plastic strain region in the widthwise direction of the steel sheet to 0.05 mm or more and 0.4 mm or less, and a ratio (?d/?w) of a total ?d of the length d to a total ?w of application interval w of each of the above plastic strain regions to 0.2 or more and 0.6 or less.

Abstract: Electric resistance welded steel pipe excellent in deformability and fatigue properties after quenching which enables working into complicated shapes without spheroidization and which improves the fatigue properties after cold working and quenching without carburization are provided. The electric resistance welded steel pipe is characterized by containing, by mass %, C: 0.15 to 0.55%, Si: 0.01 to 0.30%, Mn: 0.5 to 1.5%, Ca: 0.0010 to 0.0030%, S: 0.0005 to 0.0050%, and O: 0.0005 to 0.0050%, having contents of Ca, O, and S satisfying 0.10?[Ca](1?124[O])/1.25[S]?2.50, having Ca-based inclusions present at the base material and electric resistance weld zone with an average particle size of 1.0 to 10 ?m and a density of 3 to 300/mm2, and having a difference ?Hv of the maximum hardness of the electric resistance weld zone and the average hardness of the base material part satisfying 100 to 500.

Abstract: A pipe having chemical composition contains, by mass %, C: 0.05% or less, Si: 0.5% or less, Mn: 0.15% or more and 1.0% or less, Cr: 13.5% or more and 15.4% or less, Ni: 3.5% or more and 6.0% or less, Mo: 1.5% or more and 5.0% or less, Cu: 3.5% or less, W: 2.5% or less, and N: 0.15% or less so that the relationship ?5.9×(7.82+27C?0.91 Si+0.21Mn?0.9Cr+Ni?1.1Mo?0.55W+0.2Cu+11N)?13.0 is satisfied.

Abstract: A method for smelting a nickel oxide ore, wherein the reduction step progresses effectively while maintaining the strength of the pellets, comprises: a pellet production step S1 for producing pellets from a nickel oxide ore; and a reduction step S2 for reducing and heating the obtained pellets in a smelting furnace at a predetermined reduction temperature. In the pellet production step S1, a mixture is formed by mixing materials including said nickel oxide ore without mixing a carbonaceous reducing agent, and the pellets are formed by agglomerating said mixture. In the reduction step S2, in charging the obtained pellets into the smelting furnace, a carbonaceous reducing agent is spread in advance over the furnace floor of the smelting furnace and the pellets are placed on the carbonaceous reducing agent, and the pellets are reduced and heated in a state where the pellets are covered by the carbonaceous reducing agent.

Abstract: A copper alloy wire rod includes a copper parent phase and short fiber-shaped composite phases which are dispersed in the copper parent phase and which contain Cu8Zr3 and Cu, wherein the content of Zr is within the range of 0.2 atomic percent or more and 1.0 atomic percent or less. This copper alloy wire rod can be obtained by including the steps of melting a raw material in such a way that a copper alloy having a Zr content within the above-described range of is produced so as to obtain a molten metal in a melting step, casting the molten metal so as to obtain an ingot in a casting step, and subjecting the ingot to cold wire drawing in a wire drawing step, wherein the wire drawing step and a treatment after the wire drawing step are performed at lower than 500° C.

Abstract: In a method for producing a grain-oriented electrical steel sheet by hot rolling a steel slab having a chemical composition including C: 0.001˜0.10 mass %, Si: 1.0˜5.0 mass %, Mn: 0.01˜0.5 mass %, Al: less than 0.0100 mass %, each of S, Se, O and N: not more than 0.0050 mass % and the remainder being Fe and inevitable impurities, subjecting the resulting hot rolled sheet to a single cold rolling or two or more cold rollings sandwiching an intermediate annealing therebetween to a final thickness, subjecting to a primary recrystallization annealing, applying an annealing separator thereto and then subjecting to a finish annealing, a zone of 550˜700° C. in a heating process of the primary recrystallization annealing is rapidly heated at an average heating rate of 40˜200° C./s, while any temperature zone of 250˜550° C. is kept at a heating rate of not more than 10° C.

Abstract: A Zr-based amorphous alloy is provided; the formula of the Zr-based amorphous alloy is (Zr, Hf, Nb)aCubNicAldRee, where a, b, c, d, and e are corresponding atomic percent content of elements in the Zr-based amorphous alloy, 45?a?65, 15?b?40, 0.1?c?15, 5?d?15, 0.05?e?5, a+b+c+d+e?100, and Re is one of or any combination of elements La, Ce, Po, Ho, Er, Nd, Gd, Dy, Sc, Eu, Tm, Tb, Pr, Sm, Yb, and Lu, or Re is combined with Y and one of or any combination of elements La, Ce, Po, Ho, Er, Nd, Gd, Dy, Sc, Eu, Tm, Tb, Pr, Sm, Yb, and Lu.

Abstract: In a method of producing a grain-oriented electrical steel sheet by hot rolling a steel slab having a chemical composition comprising C: 0.001 to 0.10 mass %, Si: 1.0 to 5.0 mass %, Mn: 0.01 to 0.5 mass %, S and/or Se: 0.005 to 0.040 mass %, sol. Al: 0.003˜0.050 mass % and N: 0.0010 to 0.020 mass %, subjecting to single cold rolling or two or more cold rollings including an intermediate annealing therebetween to a final thickness, performing primary recrystallization annealing, and thereafter applying an annealing separator to perform final annealing, a temperature range of 550° C. to 700° C. in a heating process of the primary recrystallization annealing is rapidly heated at an average heating rate of 40 to 200° C./s, while any temperature zone of from 250° C. to 550° C. is kept at a heating rate of not more than 10° C./s for 1 to 10 seconds, whereby the refining of secondary recrystallized grains is attained and grain-oriented electrical steel sheets are stably obtained with a low iron loss.

Abstract: Provided is austenite heat-resisting cast steel with reduced precipitation of ferrite phase during the application of thermal load to stabilize the austenite structure for improved heat resistance. The austenite heat-resisting cast steel contains elements of 0.1 to 0.6 mass % of C, 1.0 to 2.5 mass % of Si, 1.0 to 3.5 mass % of Mn, 0.05 to 0.2 mass % of S, 14 to 24 mass % of Cr, 5 to 20 mass % of Ni, 0.1 to 0.3 mass % of N, 0.01 to 1.2 mass % of Zr, 0.01 to 1.5 mass % of Cu, 0.01 to 1.5 mass % of Nb, Fe as a remainder and unavoidable impurity. The elements satisfy the following expressions: Mn—S?1.0; and C?(1/12Cr?32Zr)>0, where symbols for elements in these expressions represent values indicating content of the elements corresponding to the symbols in a unit of atomic %.

Abstract: Disclosed is an ultra high strength steel plate with at least 1100 MPa of tensile strength that has both an excellent strength-stretch balance and excellent bending workability, and a method for producing the same. The metal structure of the steel plate has martensite, and the soft phases of bainitic ferrite and polygonal ferrite. The area of the aforementioned martensite constitutes 50% or more, the area of the aforementioned bainitic ferrite constitutes 15% or more, and the area of the aforementioned polygonal ferrite constitutes 5% or less (including 0%). When the circle-equivalent diameter of the aforementioned soft phases is measured, the coefficient of variation (standard deviation/mean value) is less or equal to 1.0. The ultra high strength steel plate has at least 1100 MPa of tensile strength.

Abstract: The present invention is directed to an alloy usable for jewelry applications in which the color can be classified as white, the alloy contains both platinum and palladium and is at a metal cost or lower than that of traditional palladium-containing jewelry alloys, and is commercially age hardenable through heat treatment.

Abstract: In a method for producing a grain-oriented electrical steel sheet by including 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.

Abstract: An aluminum alloy has a low thermal conductivity at room temperature (25° C.) and a high thermal conductivity at high temperature (200° C.). The aluminum alloy includes 1˜2 wt % of magnesium (Mg), 1˜2 wt % of copper (Cu), 1˜2 wt % of zinc (Zn), 0.5˜2 wt % of nickel (Ni), and the remainder of aluminum (Al) and inevitable impurities.

Abstract: Provided is a martensitic stainless steel having excellent productivity and high corrosion resistance, which comprises, as percentages by weight, 0.45 to 0.60% carbon, 0.02 to 0.08% nitrogen, 0.2 to 0.4% silicon, 0.3 to 0.6% manganese, 12 to 15% chromium, one or more kinds of 0.1 to 1.5% molybdenum or 0.1 to 1.5% tungsten and Fe and other unavoidable impurities as remnants.