Abstract: A non-oriented electrical steel sheet contains Cr: 0.3 mass % to 5.3 mass %, Si: 1.5 mass % to 4 mass %, Al: 0.4 mass % to 3 mass %, and W: 0.0003 mass % to 0.01 mass %. A C content is 0.006 mass % or less, a Mn content is 1.5 mass % or less, a S content is 0.003 mass % or less, and a N content is 0.003 mass % or less, and the balance is composed of Fe and inevitable impurities.

Abstract: The present invention provides a fire-resistant steel material superior in HAZ toughness of a welded joint which is high in high temperature yield strength at an envisioned fire temperature of 700 to 800° C. and is free of embrittlement of the welded joint even if exposed at this envisioned fire temperature and a method of production of the same, that is, a fire-resistant steel material of a composition containing, by mass %, C: 0.005% to less than 0.03%, Si: 0.01 to 0.50%, Mn: 0.05 to 0.40%, Cr: 1.50 to 5.00%, V: 0.05 to 0.50%, and N: 0.001 to 0.005% and restricted in contents of Ni, Cu, Mo, B, P, S, and O obtained by heating a steel slab to 1150 to 1300° C., then hot working or hot rolling the slab to an end temperature of 880 degrees or more, acceleratedly cooling the worked or rolled steel material under conditions of a cooling rate at a position of the slowest cooling rate of at least 2° C.

Abstract: Useful permanent magnet materials are formed by processing molten alloys of cerium, iron, and boron to form permanent magnet compositions with appreciable coercivity and remanence. For example, Ce16.7Fe77.8B5.6 has been produced with coercivity, Hci of 6.18 kOe and remanence, Br of 4.92 kG. In one practice, streams of the molten alloy are rapidly quenched (e.g., by melt spinning) to form magnetically-soft melt-spun material which is suitably annealed to obtain permanent magnet properties. In another practice, the streams of molten alloy are quenched at a predetermined quench rate to directly obtain permanent magnet properties in the cerium-iron-boron material.

Abstract: The present invention provides a steel material for hardening, including chemical components, by mass %, of: C: 0.15 to 0.60%; Si: 0.01 to 1.5%; Mn: 0.05 to 2.5%; P: 0.005 to 0.20%; S: 0.001 to 0.35%; Al: over 0.06 to 0.3%; and total N: 0.006 to 0.03%, with a balance including Fe and inevitable impurities including B of not more than 0.0004%, in which a hardness R at a position 5 mm away from a quenching end measured through a Jominy-type end-quenching method specified in JIS G 0561, and a calculation hardness H at a position 4.763 mm away from the quenching end satisfy the following Equation (1). H×0.948?R?H×1.

Abstract: A carbothermic reduction method is provided for reducing a rare earth element-containing oxide including at least one of neodymium (Nd) and praseodymium (Pr) and possibly other rare earth elements (La, Ce, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Sc, and Y) as alloying agents in the presence of carbon and a source of a reactant element including one or more of silicon, germanium, tin, lead, arsenic, antimony and bismuth to form a rare earth element-containing intermediate alloy as a master alloy for making permanent magnet material. The process is a more efficient, lower cost and environmentally friendly technology than current methods of manufacturing rare earth metals. The intermediate material is useful as a master alloy for making a permanent magnet material comprising at least one of neodymium and praseodymium, and possibly other rare earth metals as alloying additives.

Abstract: Provided are a powder for a magnet, which provides a rare-earth magnet having excellent magnet properties and which has excellent formability, a method for producing the powder for a magnet, a powder compact, a rare-earth-iron-based alloy material, and a rare-earth-iron-nitrogen-based alloy material which are used as materials for the magnet, and methods for producing the powder compact and these alloy materials. Magnetic particles 1 constituting the powder for a magnet each have a texture in which grains of a phase 3 of a hydride of a rare-earth element are dispersed in a phase 2 of an iron-containing material, such as Fe. The uniform presence of the phase 2 of the iron-containing material in each magnetic particle 1 results in the powder having excellent formability, thereby providing a powder compact 4 having a high relative density.

Abstract: A structural steel material contains C: 0.020% or more and less than 0.140%, Si: 0.05% or more and 2.00% or less, Mn: 0.20% or more and 2.00% or less, P: 0.005% or more and 0.030% or less, S: 0.0001% or more and 0.0200% or less, Al: 0.001% or more and 0.100% or less, Cu: 0.10% or more and 1.00% or less, Ni: 0.10% or more and less than 0.65%, and W: 0.05% or more and 1.00% or less, and one or both of Nb: 0.005% or more and 0.200% or less and Sn: 0.005% or more and 0.200% or less, the balance being iron and unavoidable impurities.

Abstract: One aspect of the present disclosure is directed to low-alloy steels exhibiting high hardness and an advantageous level of multi-hit ballistic resistance with minimal crack propagation imparting a level of ballistic performance suitable for military armor applications. Certain embodiments of the steels according to the present disclosure have hardness in excess of 550 HBN and demonstrate a high level of ballistic penetration resistance relative to conventional military specifications.

Abstract: In an embodiment, a magnet material includes a composition represented by Rx(Nb1-pZrp)yBZ(T1-qMq)100-x-y-z, where R is an element selected from rare earth elements and 50 at. % or more of R is Sm, T is Fe alone or a mixture of Fe and Co containing 50 at. % or more of Fe, M is at least one element selected from Ni, Cu, V, Cr, Mn, Al, Si, Ga, Ta and W, p is 0?p?0.5, q is 0?q?0.2, x is 4?x?15 at. %, y is 1?y?4 at. %, z is 0.001?z<4 at. %, and a structure having a TbCu7 crystal phase as a main phase.

Abstract: The invention relates to steel which is characterized by the following composition as expressed in percentages by weight:—C=0.18 0.30%, —Co=5-7%, —Cr=2-5%, —Al=1-2%, —Mo+W/2=1-4%, —V=trace 0.3%, —Nb=trace 0.1%, —B=trace?50 ppm, —Ni=10.5-15% with Ni?7+3.5 Al, —Si=trace 0.4%, —Mn=trace 0.4%, —Ca=trace?500 ppm, —Rare earths=trace?500 ppm, —Ti=trace?500 ppm, —O=trace?200 ppm if the steel is obtained by means of powder metallurgy or trace?50 ppm if the steel is produced in air or under a vacuum from molten metal, —N=trace?100 ppm, —S=trace?50 ppm, —Cu=trace?1%, and —P=trace?200 ppm, the remainder comprising iron and the inevitable impurities resulting from production. The invention also relates to a method of producing a part from said steel and to the part thus obtained.

Abstract: The invention relates to steel which is characterized by the following composition as expressed in percentages by weight: —C=0.18 0.30%, —Co=5-7%, —Cr=2-5%, —Al=1-2%, —Mo+W/2=1-4%, —V=trace 0.3%, —Nb=trace 0.1%, —B=trace—50 ppm, —Ni=10.5-15% with Ni?7+3.5 Al, —Si=trace 0.4%, —Mn=trace 0.4%, —Ca=trace—500 ppm, —Rare earths=trace—500 ppm, —Ti=trace—500 ppm, —O=Trace—200 ppm if the steel is obtained by means of powder metallurgy or trace—50 ppm if the steel is produced in air or under a vacuum from molten metal, —N=trace—100 ppm, —S=trace—50 ppm, —Cu=trace—1%, and —P=trace—200 ppm, the remainder including iron and the inevitable impurities resulting from production. The invention also relates to a method of producing a part from said steel and to the part thus obtained.

Abstract: There is provided a rare earth magnet with excellent Br and HcJ values. The rare earth magnet according to a preferred embodiment of the invention is characterized by being composed mainly of R (where R is at least one element selected from among rare earth elements including Y), B, Al, Cu, Zr, Co, O, C and Fe, wherein the content of each element is R: 25-34 wt %, B: 0.85-0.98 wt %, Al: 0.03-0.3 wt %, Cu: 0.01-0.15 wt %, Zr: 0.03-0.25 wt %, Co: ?3 wt % (but not 0 wt %), O: ?0.2 wt %, C: 0.03-0.15 wt % and Fe: remainder.

Abstract: There is disclosed a magnetic material having a composition in atomic percentage of: (MM1-aRa)uFe100-u-v-w-x-yYvMwTxBy wherein MM is a mischmetal or a synthetic equivalent thereof; R is Nd, Pr or a combination thereof; Y is a transition metal other than Fe; M is one or more of a metal selected from Groups 4 to 6 of the periodic table; and T is one or more of a metal other than B, selected from Groups 11 to 14 of the periodic table, wherein 0?a?1, 7?u?13, 0?v?20, 0?w?5; 0?x?5 and 4?y?12.

Abstract: An R-T-B based sintered magnet includes both a light rare-earth element RL (which is at least one of Nd and Pr) and a heavy rare-earth element RH (which is at least one of Dy and Tb) and Nd2Fe14B type crystals as a main phase. The magnet has a first region, which includes either the heavy rare-earth element RH in a relatively low concentration or no heavy rare-earth elements RH at all, and a second region, which includes the heavy rare-earth element RH in a relatively high concentration. The first and second regions are combined together by going through a sintering process.

Abstract: The present disclosure discloses a permanent magnetic material comprising an Nd—Fe—B alloy and an additive including at least a cobalt ferrite, and a method for preparing a permanent magnetic material. The method comprises steps of mixing an Nd—Fe—B alloy and an additive including at least a cobalt ferrite to obtain a mixture; magnetically orienting and pressing the mixture in a magnetic filed; and sintering and tempering the mixture under the protection of vacuum or an inert gas.

Abstract: In a non-oriented electrical steel sheet, Si: not less than 1.0 mass % nor more than 3.5 mass %, Al: not less than 0.1 mass % nor more than 3.0 mass %, Ti: not less than 0.001 mass % nor more than 0.01 mass %, Bi: not less than 0.001 mass % nor more than 0.01 mass %, and so on are contained. (1) expression described below is satisfied when a Ti content (mass %) is represented as [Ti] and a Bi content (mass %) is represented as [Bi]. [Ti]?0.8×[Bi]+0.

Abstract: A permanent magnet operable above about 125 C to about 200 C has a major phase represented by MRE2(Fe, Co)14B wherein said MRE comprises two or more rare earth elements selected from the group consisting of La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, and Y wherein one of the rare earth elements is chosen from one or more of La, Ce, Pr, Nd, Eu, and Gd but in an amount not exceeding 45 atomic % of the magnet and wherein at least 50% atomic % of MRE comprises Y and at least one of Dy, Ho, and Tb. The total content of the at least one of Dy, Ho, and Tb is in the range of 0 to 4 weight % of the total mass of the magnet.

Abstract: The present invention relates to an implant, in particular an intraluminal endoprosthesis, the body of which comprises at least predominantly a material with iron as the main constituent. For accelerating the degradation, the material comprises sulfur as first minor constituent with a concentration of more than 0.2% by weight and not more than 1% by weight, preferably not more than 0.5% by weight, and comprises as second minor constituent at least one element of the group which comprises calcium, manganese and magnesium. Furthermore, a method for producing such an implant is described.

Abstract: The present invention provides a line pipe of, e.g., the API standard X60 to X100 class. The line pipe has an excellent deformability, as well as excellent low temperature toughness and high productivity, a steel plate used as the material of the steel pipe. Methods for producing the steel pipe and the steel plate are also provided. In particular, a high-strength steel plate excellent in the deformability has a ferrite phase is dispersed finely, and accounts for 5% to 40% in area percentage in a low temperature transformation structure mainly composed of a bainite phase. For example, most grain sizes of the ferrite phase are smaller than the average grain size of the bainite phase. A high-strength steel pipe excellent in deformability is also provided, in which a large diameter steel pipe is produced through forming the steel plate into a pipe shape. The steel pipe has the above-referenced structure, and satisfies the conditions that YS/TS is 0.95 or less and YS×uEL is 5,000 or more.

Abstract: A spring steel having a high strength of 1900 MPa or more and superior in the brittle fracture resistance, as well as a method for manufacturing the same, are provided. The high strength spring steel comprises, as basic components in mass %, C: 0.4-0.6%, Si: 1.4-3.0%, Mn: 0.1-1.0%, Cr: 0.2-2.5%, P: 0.025% or less, S: 0.025% or less, N: 0.006% or less, Al: 0.1% or less, and O: 0.003% or less, the amount of solute C being 0.15% or less, the amount of Cr contained as a Cr-containing precipitate being 0.10% or less, and a TS value represented by the following equation being 24.8% or more, and in point of structure, the pre-austenite grain diameter being 10 ?m or smaller, wherein TS=28.5*[C]+4.9*[Si]+0.5*[Mn]+2.5*[Cr]+1.7*[V]+3.7*[Mo] where [X] stands for mass % of element X.

Abstract: A non-oriented electrical steel sheet contains: C: not less than 0.003 mass % nor more than 0.05 mass %; N: not less than 0.001 mass % nor more than 0.01 mass %; and Si: not less than 2.8 mass % nor more than 3.5 mass %. The non-oriented electrical steel sheet further contains at least one kind selected from a group consisting of Ni: 4.0 mass % or less and Mn: 2.0 mass % or less, in a total amount of 0.5 mass % or more, and further contains Ti, a value RTi being not less than 1 nor more than 10, the value RTi being expressed by [Ti]/(4×([C]+[N])) when a Ti content is expressed as [Ti] mass %, a C content is expressed as [C] mass %, and an N content is expressed as [N] mass %. An Al content is 3.0 mass % or less, and a P content is 0.2 mass % or less.

Abstract: A steel characterized in that its composition is percentages by weight: C=0.18-0.30% Co=1.5-4% Cr=2-5% Al=1-2% Mo+W/2=1-4% V=traces-0.3% Nb=traces-0.1% B=traces-30 ppm Ni=11-16% where Ni?7+3.5 Al Si=traces-1.0% Mn=traces-4.0% Ca=traces-20 ppm Rare earths=traces-100 ppm if N?10 ppm, Ti+Zr/2=traces-100 ppm where Ti+Zr/2?10 N if 10 ppm<N?20 ppm, Ti+Zr/2=traces-150 ppm O=traces-50 ppm N=traces-20 ppm S=traces-20 ppm Cu=traces-1% P=traces-200 ppm the remainder being iron and inevitable impurities resulting from the smelting. A process for manufacturing a part from this steel, and part thus obtained.

Abstract: Corrosion-resistant steel for chimney/flue use in natural gas-fired or liquefied petroleum gas-fired plants, containing C: 0.005% to 0.030%, Si: 0.18% to 0.50%, Mn: 1.50% to less than 3.00, P: 0.030% or less, S: 0.0050% or less, Cr: 4.0% to 9.0%, Al: 0.20% to 1.50%, and N: 0.020% or less and able to prevent advanced pitting or other localized corrosion and the resultant hole formation and rust aerial dispersal is provided.

Abstract: The presently described technology relates to a material for components of a gas turbine, in particular for components of a gas turbine aircraft engine, having a matrix of an iron-based alloy material, wherein the matrix of the iron-based alloy material being hardened by means of an intermetallic material of the Laves phase.

Abstract: A magnetic material for magnetic refrigeration has a composition represented by (R11-yR2y)xFe100-x (R1 is at least one of element selected from Sm and Er, R2 is at least one of element selected from Ce, Pr, Nd, Tb and Dy, and x and y are numerical values satisfying 4?x?20 atomic % and 0.05?y?0.95), and includes a Th2Zn17 crystal phase, a Th2Ni17 crystal phase, or a TbCu7 crystal phase as a main phase.

Abstract: The present invention provides a high-tensile steel material having a tensile strength of the 550 MPa class or more which can simultaneously raise the strength and toughness of the heat affected zone of weld to equal those of the matrix and a method of production of the same, that is, a high-tensile steel material with excellent weldability and toughness and with tensile strength of the 550 MPa class or more containing, by mass %, C: 0.005 to 0.10%, W: 0.10 to 3.0%, Nb: 0.010 to 0.080%, and V: 0.010 to 0.50%, limiting the Ti to less than 0.005%, satisfying equation; EC=2[C]?[Nb]/9?[V]/12>0.020, having an amount of precipitation of W contained in the steel material, in terms of analytical value obtained by quantitative analysis of potential electrolysis extraction residue by fluorescent X-ray analysis, of 0.0050% or less, and having 60% or more of its structural composition in a cross-section of the steel as a bainite structure.

Abstract: According to a low alloy steel of the present invention, compositional elements thereof are limited, and a metal structure thereof comprises bainite or martensite. Further, proper amounts of Nd inclusions are formed by appropriately selecting timings of deoxidation and Nd addition in melting a steel. Consequently, compatibility between high-temperature creep strength and long-term creep ductility, which is hardly established in conventional steels, can be achieved even in hostile conditions. Accordingly, the low alloy steel of the present invention can be widely applied as the material for the heat-resistant structural member used for a long time under the high-temperature and high-pressure conditions such as power plant boilers, turbines, and nuclear power plants.

Abstract: There is produced a molten steel containing, in mass %, Si: not less than 0.1% nor more than 7.0%, Mn: 0.1% or more, Al: not less than 0.2% nor more than 5.0%, Cr: not less than 0.1% nor more than 10%, and the like, and a balance composed of Fe and inevitable impurities. To the molten steel, REM: not less than 0.0005% nor more than 0.03% is added. The molten steel to which REM has been added is casted. A cast slab of non-oriented electrical steel is manufactured as above.

Abstract: A steel for heat treatment, which exhibits high strength and high toughness even when the heat treatment (such as quenching and tempering) of the steel is conducted under conventional conditions in an after stage. The steel for heat treatment contains C: 0.10 to 0.70 mass %, Mn: 0.1 to 3.0 mass %, Al: 0.005 to 2.0 mass %, P: 0.050 mass % or less, S: 0.50 mass % or less, O: 0.0030 mass or less, N: 0.0200 mass % or less, and one or more selected from the group consisting of Ti: 0.30 mass % or less and Nb: 0.30 mass or less with the balance being Fe and unavoidable impurities, and has a TH value of 1.0 or above as calculated according to the formula: ({Ti}/48+{Nb}/93) 104 and grain diameters of 10 ?m or below. {Ti} and {Nb} refer respectively to the contents of Ti and Nb in precipitates of 5 to 100 nm in size as determined about their respective extraction residues.

Abstract: A cold work tool steel with average or above wear resistance, a hardness in excess of (60) HRc and a very good toughness but with considerably lower carbon contents leading to highly improved weldability is obtained by combining the presence of primary carbides (or alternatively nitrides and/or borides) with other strengthening mechanisms like precipitation hardening or even solid solution. Vanadium rich MC type carbides, modified with refractory metal additions, present the best compromise of hardness and fracture toughness for several applications, while for other applications harder carbides, such as Ti carbides or Ti mixed carbides (primarily with V, Mo and/or W) will be the preferred ones, alternatively using Zr and Hf mixed carbides.

Abstract: A high-strength steel sheet includes: 0.03 to 0.20% of C, 0.08 to 1.5% of Si, 0.5 to 3.0% of Mn, 0.05% or less of P, 0.0005% or more of S, 0.008 to 0.20% of acid-soluble Ti, 0.0005 to 0.01% of N, more than 0.01% of acid-soluble Al, and 0.001 to 0.04% of one or both of Ce and La in terms of mass %; and the balance including Fe and inevitable impurities. The ratio of (Ce+La)/acid-soluble Al is equal to or more than 0.1 and the ratio of (Ce+La)/S is in the range of 0.4 to 50 in a mass base, and the density of the number of inclusions, having a circle equivalent diameter of 2 ?m or less, which are present in the steel sheet is equal to or more than 15/mm2.

Abstract: The present invention provides a steel plate that exhibits excellent low-temperature toughness in a base material and a weld heat-affected zone and has small strength anisotropy, wherein the steel includes, by mass, C: 0.04%-0.10%; Si: 0.02%-0.40%; Mn: 0.5%-1.0%; P: 0.0010%-0.0100%; S: 0.0001%-0.0050%; Ni: 2.0%-4.5%; Cr: 0.1%-1.0%; Mo: 0.1%-0.6%; V: 0.005%-0.1%; Al: 0.01%-0.08%; and N: 0.0001%-0.0070%, with the balance including Fe and inevitable impurities, a Ni segregation ratio at a portion located at one-fourth of a thickness of the steel plate in a steel-plate thickness direction from a surface of the steel plate is 1.3 or lower, a degree of flatness of a prior austenite grain is in a range from 1.05 to 3.0, an effective diameter of crystal grain is 10 ?m or lower, and a Vickers hardness number is in a range of 265 HV to 310 HV.

Abstract: The invention relates to a Fe—Si—La alloy having the following atomic composition: (La1-a-a?MmaTRa?)1[(Fe1-b-b,CobMb,)1-x(Si1-cXc)x]13(CdNeH1-d-e)y(R)r(I)r, in which Mm is a mixture of lanthanum, cerium, neodymium and praseodymium in a weight proportion of 22 to 26% of La, 48 to 53% of Ce, 17 to 20% of Nd and 5 to 7% of Pr, wherein said mixture may include up to 1 wt % of impurities, TR is one or more elements of the rare earth family other than lanthanum, M is one or more d-type transition element from layers 3d, 4d and 5d, X is a metalloid element selected from Ge, Al, B, Ga and In, R is one or more element selected from Al, Ca, Mg, K and Na, I is one or two elements selected from O and S, with: 0?a<0.5 and 0?a?<0.2; 0?b?0.2 and 0?b?<0.4; 0?c?0.5 and 0?d?1; 0?e?1 and f?0.1; 0.09?x?0.13 and 0.002?y?4; 0.0001?z?0.01; the indicia b, d, e, x and y being such that the alloy further meets the following condition: 6.143b(13(1?x))+4.437y[1?0.0614(d++e)]?1 Eq.1 d*y?0.005 Eq.2.

Abstract: A nodular graphite, heat-resistant cast iron composition for use in engine systems. The composition contains carbon 1.5-2.4 weight %, silicon 5.4-7.0 weight %, manganese 0.5-1.5 weight %, nickel 22.0-28.0 weight %, chromium 1.5-3.0 weight %, molybdenum 0.1-1.0 weight %, magnesium 0.03-0.1 weight %, and a balance weight % being substantially iron. The composition has an austenitic matrix. Additionally, the composition exhibits excellent oxidation resistance at high temperature and excellent mechanical properties at both room and high temperatures. Thus, the composition can be a lower cost substitute material for Ni-Resist D5S under thermocycling conditions experienced by exhaust gas accessories and housings such as engine exhaust manifolds, turbocharger housings, and catalytic converter housings.

Abstract: This steel for induction hardening includes: in terms of mass %, C: 0.40% or more to 0.75% or less; Si: 0.002% or more to 3.0% or less; Mn: 0.20% or more to 2.0% or less; S: 0.002% or more to 0.1% or less; Al: more than 0.10% to 3.0% or less; P: 0.030% or less; and N: 0.035% or less, with the remainder being Fe and inevitable impurities.

Abstract: A magnetic article comprises, in total, elements in amounts capable of providing at least one (La1-aMa) (Fe1-b-cTbYc)13-dXe phase and less than 0.5 Vol % impurities, wherein 0?a?0.9, 0?b?0.2, 0.05?c?0.2, ?1?d?+1, 0?e?3, M is one or more of the elements Ce, Pr and Nd, T is one or more of the elements Co, Ni, Mn and Cr, Y is one or more of the elements Si, Al, As, Ga, Ge, Sn and Sb and X is one or more of the elements H, B, C, N, Li and Be. The magnetic article comprises a permanent magnet.

Abstract: Steel is described having a chemical composition, in weight-%, of 0.3 to 0.5% carbon (C), from traces to a max. of 1.5% silicon (Si), 0.2 to 1.5% manganese (Mn), 0.01 to 0.2% sulfur (S), 1.5 to 4% chromium (Cr), 1.5 to 5% nickel (Ni), 0.5 to 2% molybdenum (Mo), which at least partially may be replaced by twice as much tungsten (W), 0.2 to 1.5% vanadium (V), from traces to a max. of 0.2% rare earth metals, and a balance essentially of only iron, impurities and accessory elements in normal amounts. In addition, a method for manufacturing a blank of the steel and a process for manufacturing a cutting tool body or holder for cutting tools of the steel is described.

Abstract: The present invention provides a fire-resistant steel material superior in weld heat affected zone reheat embrittlement resistance and low temperature toughness when welded by large heat input and exposed to fire and a method of production of the same, that is, a material containing C: 0.012 to 0.050%, Mn: 0.80 to 2.00%, Cr: 0.80 to 1.90%, and Nb: 0.01 to less than 0.05%, restricting Cu to 0.10% or less, containing suitable quantities of Si, N, Ti, and Al, restricting the contents of Mo, B, P, S, and O, and having a balance of Fe and unavoidable impurities, having contents of C, Mn, Cr, Nb, and Cu satisfying ?1200C?20Mn+30Cr?330Nb?120Cu??80, having a steel structure as observed by an optical microscope of an area fraction of 80% or more of a ferrite phase, and having a balance of the steel structure of a bainite phase, martensite phase, and mixed martensite-austenite structure.

Abstract: The present invention provides a high strength thick steel material excellent in toughness and weldability reduced in amount of C and amount of N, containing suitable amounts of Si, Mn, Nb, Ti, B, and O, having contents of C and Nb satisfying C—Nb/7.74?0.004, having a density of Ti-containing oxides of a particle size of 0.05 to 10 ?m of 30 to 300/mm2, and having a density of Ti-containing oxides of a particle size over 10 ?m of 10/mm2 or less, produced by treating steel by preliminary deoxidation to adjust the dissolved oxygen to 0.005 to 0.015 mass %, then adding Ti and, furthermore, vacuum degassing the steel for 30 minutes or more, smelting it, then continuously casting it to produce a steel slab or billet, heating the steel slab or billet to 1100 to 1350° C., hot rolling the slab or billet to a thickness of 40 to 150 mm, then cooling it.

Abstract: The present invention provides a steel for a fracture splitting type connecting rod, in which: the steel contains C: 0.25-0.5% (in mass %, the same is applied hereunder), Si: 0.01-2.0%, Mn: 0.50-2.0%, P: 0.015-0.080%, S: 0.01-0.2%, V: 0.02-0.20%, Cr: 0.05-1.0%, Ti: 0.01-0.10%, and N: 0.01% or less; an f-value represented by the expression shown below is in the range of 0.003 to 0.04; and the average aspect ratio of sulfide system inclusions is 15 or less, f=[Ti]?[N]×48/14 (in the expression, [Ti] and [N] represent the contents (mass %) of Ti and N in a steel, respectively).

Abstract: Disclosed is a cold-rolled steel sheet having a specific steel composition and having a composite steel structure including a ferrite structure and a martensite-containing second phase. In a surface region of the steel sheet from the surface to a depth one-tenth the gage, the number density of n-ary groups of inclusions determined by specific n-th determinations is 120 or less per 100 cm2 of a rolling plane, in which the distance in steel sheet rolling direction between outermost surfaces of two outermost particles of the group of inclusions is 80 ?m or more. Also disclosed is a cold-rolled steel sheet having a specific steel composition and having a steel structure of a martensite single-phase structure. In the surface region, the number density of groups of inclusions, in which the distance between the outermost surfaces is 100 ?m or more, is 120 or less per 100 cm2 of a rolling plane.

Abstract: There is provided a rare earth magnet with excellent Br and HcJ values. The rare earth magnet according to a preferred embodiment of the invention is characterized by being composed mainly of R (where R is at least one element selected from among rare earth elements including Y), B, Al, Cu, Zr, Co, O, C and Fe, wherein the content of each element is R: 25-34 wt %, B: 0.85-0.98 wt %, Al: 0.03-0.3 wt %, Cu: 0.01-0.15 wt %, Zr: 0.03-0.25 wt %, Co: ?3 wt % (but not 0 wt %), O: ?0.2 wt %, C: 0.03-0.15 wt % and Fe: remainder.

Abstract: In order to provide a high tensile strength steel having excellent low temperature toughness and which can withstand large heat input welding, a steel comprises, in mass percent, C: 0.01-0.10%, Si: at most 0.5%, Mn: 0.8-1.8%, P: at most 0.020%, S: at most 0.01%, Cu: 0.8-1.5%, Ni: 0.2-1.5%, Al: 0.001-0.05%, N: 0.0030-0.0080%, O: 0.0005-0.0035%, if necessary at least one of Ti: 0.005-0.03%, Nb: 0.003-0.03%, and Mo: 0.1-0.8%, and a remainder of Fe and impurities, and the N/Al ratio is 0.3-3.0.

Abstract: A nanocomposite magnet according to the present invention has a composition represented by the general formula: RxQyMz(Fe1-mTm)bal, where R is at least one rare-earth element, Q is at least one element selected from the group consisting of B and C, M is at least one metal element that is selected from the group consisting of Al, Si, Ti, V, Cr, Mn, Cu, Zn, Ga, Zr, Nb, Mo, Ag, Hf, Ta, W, Pt, Au and Pb and that always includes Ti, and T is at least one element selected from the group consisting of Co and Ni. The mole fractions x, y, z and m satisfy the inequalities of 6 at %?x<10 at %, 10 at %?y?17 at %, 0.5 at %?z?6 at % and 0?m?0.5, respectively. The nanocomposite magnet includes a hard magnetic phase and a soft magnetic phase that are magnetically coupled together. The hard magnetic phase is made of an R2Fe14B-type compound, and the soft magnetic phase includes an ?-Fe phase and a crystalline phase with a Curie temperature of 610° C. to 700° C. (? phase) as its main phases.

Abstract: The invention provides a method for producing alloy flakes for rare earth sintered magnets, which makes uniform the intervals, size, orientation, and shape of the R-rich region and the dendrites of the 2-14-1 phase, which inhibits formation of chill, and which produces flakes that are pulverized into powder of a uniform particle size in the pulverization step in the production of a rare earth sintered magnet, and that are pulverized into powder compactable into a product with a controlled shrink ratio, and alloy flakes for a rare earth sintered magnet obtained by the method, and a rare earth sintered magnet having excellent magnetic properties.

Abstract: The present invention has as its object the production of high strength electrical steel sheet, having a high strength of a tensile strength TS of for example 500 MPa or more, having wear resistance, and having superior magnetic properties of magnetic flux density and iron loss, that is, provides a method of production of high strength electrical steel sheet containing, by mass %, C: 0.060% or less, Si: 0.2 to 6.5%, Mn: 0.05 to 3.0%, P: 0.30% or less, S or Se: 0.040% or less, Al: 2.50% or less, N: 0.020% or less, and further one or more of Cu: 0.001 to 30.0% and Nb: 0.03 to 8.

Abstract: An RE-containing alloy, which is represented by a compositional formula of RrTtAa (wherein R represents at least one rare earth element selected from among La, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Ho, Tm, Yb, Gd, and Lu; T collectively represents transition metal elements containing at least Fe atoms, a portion of the Fe atoms being optionally substituted by at least one species selected from among Co, Ni, Mn, Pt, and Pd; A represents at least one element selected from among Al, As, Si, Ga, Ge, Mn, Sn, and Sb; and r, t, and a have the following relationships: 5.0 at. %?r?6.8 at. %, 73.8 at. %?t?88.7 at. %, and 4.6 at. %?a?19.4 at. %) and having an alloy microstructure containing an NaZn13-type crystal structure in an amount of at least 85 mass % and ?-Fe in an amount of 5-15 mass % inclusive.

Abstract: High cleanliness spring steel useful in manufacturing a spring with SiO2-based inclusions being extremely controlled and excellent in fatigue properties is provided. High cleanliness spring steel which is steel containing; C: 1.2% (means mass %, hereafter the same with respect to the component) or below (not inclusive of 0%), Si: 1.2-4%, Mn: 0.1-2.0%, Al: 0.01% or below (not inclusive of 0%), and the balance comprising iron with inevitable impurities, wherein; the total of oxide-based inclusions of 4 or above of L (the large diameter of an inclusion)/D (the short diameter of an inclusion) and 25 ?m or above of D and oxide-based inclusions of less than 4 L/D and 25 ?m or above of L, in the oxide-based inclusions of 25 mass % or above of oxygen concentration and 70% (means mass %, hereafter the same with respect to inclusions) or above of SiO2 content when Al2O3+MgO+CaO+SiO2+MnO=100% is presumed, out of inclusions in the steel, is 20 nos./500 g or below.

Abstract: A Si-killed steel wire rod for obtaining a spring excellent in fatigue properties and a spring excellent in fatigue properties obtained from the steel wire rod are provided. The Si-killed steel wire rod of the present invention contains Sr: 0.03-20 ppm (means “mass ppm”, hereinafter the same), Al: 1-30 ppm and Si: 0.2-4% (means “mass %”, hereinafter the same) respectively, and contains Mg and/or Ca by a range of 0.5-30 ppm in total. Also, in the Si-killed steel wire rod of the present invention, oxide-based inclusions present in the wire rod contain SiO2: 30-90%, Al2O3: 2-50%, MgO: 35% or below (not inclusive of 0%), CaO: 50% or below (not inclusive of 0%), MnO: 20% or below (not inclusive of 0%) and SrO: 0.2-15% respectively, and total content of (CaO+MgO) is 3% or above. A spring excellent in fatigue properties can be obtained by forming the spring from such steel wire rod.

Abstract: A soft magnetic alloy contains P, B, and Cu as essential components. As a preferred example, an Fe-based alloy contains Fe of 70 atomic % or more, B of 5 atomic % to 25 atomic %, Cu of 1.5 atomic % or less (excluding zero), and P of 10 atomic or less (excluding zero).