Abstract: An iron (Fe)-based austenitic heat-resistant cast steel includes, based on a total of 100 mass % (indicated below simply as “%”): 0.4 to 0.8% of carbon (C), 3.0% or less of silicon (Si), 0.5 to 2.0% of manganese (Mn), 0.05% or less of phosphorus (P), 0.03 to 0.2% of sulfur (S), 18 to 23% of chromium (Cr), 3.0 to 8.0% of nickel (Ni) and 0.05 to 0.4% of nitrogen (N). A ratio of chromium (Cr) to carbon (C) is in a range of 22.5?Cr/C?57.5. The cast steel includes one or two or more of vanadium (V), molybdenum (Mo), tungsten (W) and niobium (Nb) in a total amount of less than 0.2%.

Abstract: A method for manufacturing an ultra high strength member includes heating a steel sheet at a first heating temperature within a temperature range of 700 to 1000° C.; forming the steel sheet into a shape of a member at the first heating temperature and simultaneously cooling the steel sheet; after completion of the cooling, shear punching the steel sheet into a desired shape to obtain an ultra high strength member; and after the shear punching, subjecting the ultra high strength member to a first heat treatment including heating the ultra high strength member at second heating temperature within a temperature range of 100° C. or higher, but lower than 300° C. and retaining the member at the second heating temperature for 1 second to 60 minutes, wherein the resulting ultra high strength member has a tensile strength of 1180 MPa or more.

Abstract: A high strength screw (2), especially an ultra high strength screw (2) having a tensile strength Rm of at least 1400 N/mm2, having a bainite structure has a yield ratio of at least 0.95. The screw (2) belongs to the new strength classes 14.10, 15.10, 16.10 or 17.10. The high yield ratio is realized by heat treatment of the screw (2).

Abstract: This steel for a machine structure contains, in mass %: C: 0.40% to less than 0.75%; Si: 0.01% to 3.0%; Mn: 0.1% to 1.8%; S: 0.001% to 0.1%; Al: more than 0.1% and not more than 1.0%; N: 0.001% to 0.02%; and P: limited to not more than 0.05%, with a balance including Fe and inevitable impurities, in which the steel satisfies 139.38?214×[C]+30.6×[Si]+42.8×[Mn]?14.7×[Al]?177 and 0.72?[C]+1/7×[Si]+1/5×[Mn]<1.539.

Abstract: An austenitic stainless steel composition including relatively low nickel and molybdenum levels, and exhibiting corrosion resistance, resistance to elevated temperature deformation, and formability properties comparable to certain alloys including higher nickel and molybdenum levels. Embodiments of the austenitic stainless steel include, in weight %, up to 0.20 C: 2.0 to 9.0 Mn, up to 2.0 Si, 16.0 to 23.0 Cr, 1.0 to 7.0 Ni, up to 3.0 Mo, up to 3.0 Cu, 0.05 to 0.35 N, up to 4.0 W, (7.5(C))?(Nb+Ti+V+Ta+Zr)?1.5, up to 0.01 B, up to 1.0 Co, iron and impurities. Additionally, embodiments of the steel may include 0.5?(Mo+W/2)?5.0 and/or 1.0?(Ni+Co)?8.0.

Abstract: A method of processing a metal for improved damping of a metal part is provided. The method comprises placing the metal part inside a current carrying coil and closing a circuit for to apply current to the coil, thus producing a magnetic field in the metal part. Thereafter, the circuit is opened for a time and then the circuit is closed a second time to apply a second current to the coil. The circuit is then opened a second time and the metal part is removed from the current carrying coil.

Abstract: An austenitic stainless steel composition including relatively low Ni and Mo levels, and exhibiting corrosion resistance, resistance to elevated temperature deformation, and formability properties comparable to certain alloys including higher Ni and Mo levels. Embodiments of the austenitic stainless steel include, in weight percentages, up to 0.20 C, 2.0-9.0 Mn, up to 2.0 Si, 15.0-23.0 Cr, 1.0-9.5 Ni, up to 3.0 Mo, up to 3.0 Cu, 0.05-0.35 N, (7.5(C))?(Nb+Ti+V+Ta+Zr)?1.5, Fe, and incidental impurities.

Abstract: Provided is a steel sheet having a tensile strength of 980 MPa or more and exhibiting a high yield ratio and an excellent workability. The steel sheet includes C, Si, Mn, B, at least one of Ti, Nb and V, P, S, Al and N, the content by percentage of each of which is in a specified range. The metal structure thereof includes bainite, and martensite and may include ferrite. The proportion by area of bainite in the entire metal structure is 42 to 85%, that of martensite is 15 to 50%, that of ferrite is 5% or less, and that of entire microstructure of the balance other than bainite, martensite and ferrite is 3% or less thereof. Furthermore, bainite has an average crystal grain diameter of 7 ?m or less.

Abstract: A case hardened steel with excellent cold forgeability and excellent impact properties after case hardening processing contains C, Si, Mn, S, Cr, Al, Ti, Nb, B, and N, with the balance being iron and unavoidable impurities. Of precipitates containing Ti and/or Nb, precipitates having a size of not less than 20 ?m2 are at a number density of not more than 1.0/mm2. Of precipitates containing Ti and/or Nb, precipitates having a size of more than 5 ?m2 and less than 20 ?m2 and containing Mn and S are at a number density of more than 0.7/mm2 and not more than 3.0/mm2. The ferrite fraction is more than 77% by area.

Abstract: Provided are a steel pipe for a linepipe with high compressive strength and a heavy wall thickness, and a method of manufacturing the same. Lowering of yield stress caused by a Bauschinger effect can be suppressed by optimizing the metal microstructure of a steel plate without requiring particular forming conditions in forming the steel pipe, and without requiring heat treatment after pipe making. A steel pipe has the composition which contains by mass % 0.03 to 0.10% C, 0.30% or less Si, 1.00 to 2.00% Mn, 0.015% or less P, 0.003% or less S, 0.080% or less Al, 0.005 to 0.035% Nb, 0.005 to 0.020% Ti, and Fe and unavoidable impurities as a balance. The steel pipe has metal microstructure where a fraction of bainite is 60% or more, a fraction of rolled ferrite is 5% or less, and a fraction of M-A constituent (MA) is 3% or less.

Abstract: This bearing steel material satisfies a predetermined elemental composition, and is characterized by having, in the region (boundary region) from the boundary surface of spheroidal cementite to a position at 20 nm away in a base material, no greater than 0.6% (excluding 0%) of Si (boundary Si), no greater than 0.10% (excluding 0%) of Ni (boundary Ni), no greater than 0.10% (excluding 0%) of Cu (boundary Cu), no greater than 0.03% (including 0%) of Mo (boundary Mo), no greater than 0.10% (excluding 0%) of Mn (boundary Mn), and no greater than 0.9% (excluding 0%) of Cr (boundary Cr), and the circularity coefficient of the spheroidized cementite being at least 0.80. The bearing steel material exhibits favorable cold-workability during the production of a bearing component by means of cold working.

Abstract: A strain aging hardening type steel sheet excellent in aging resistance, and manufacturing method thereof, said steel sheet comprises: in mass %, C: 0.0010 to 0.010%; Si: 0.005 to 1.0%; Mn: 0.08 to 1.0%; P: 0.003 to 0.10%; S: 0.0005 to 0.020%; Al: 0.010 to 0.10%; Cr: 0.005 to 0.20%; Mo: 0.005 to 0.20%; Ti: 0.002 to 0.10%; Nb: 0.002 to 0.10%; N: 0.001 to 0.005%; and a balance being composed of Fe and inevitable impurities, in which a ferrite fraction is 98% or more, an average grain diameter of ferrite is 5 to 30 ?m, a minimum value of dislocation density in a portion having a ½ thickness of a sheet thickness and a minimum value of dislocation density in a surface layer portion are each 5×1012/m2 or more, and an average dislocation density falls within a range of 5×1012 to 1×1015/m2.

Abstract: The present invention relates to a cast steel alloy for producing cast parts with ferritic structure, wherein the alloy contains iron (Fe), carbon (C), chromium (Cr) and molybdenum (Mo). An increased resistance to intercrystalline corrosion is obtained when the alloy additionally contains titanium (Ti) and niobium (Nb).

Abstract: A composite stainless steel composition is composed essentially of, in terms of wt. % ranges: 25 to 28 Cr; 11 to 13 Ni; 7 to 8 W; 3.5 to 4 Mo; 3 to 3.5 B; 2 to 2.5 Mn; 1 to 1.5 Si; 0.3 to 1.7 C; up to 2 O; balance Fe. The composition has an austenitic matrix phase and a particulate, crystalline dispersed phase.

Abstract: A steel tube for an airbag which has a low alloy cost and a strength of at least 1000 MPa and vTrs100 of ?80° C. or below and a process for its manufacture which can minimize the number of times that softening annealing treatment is performed in a cold drawing step are provided. Stable properties are obtained even when quench hardening is carried out by high frequency induction heating on a large scale. The steel tube has a steel composition which comprises, in mass percent, C: 0.05-0.20%, Si: 0.10-0.50%, Mn: 0.10-1.00%, P: at most 0.025%, S: at most 0.005%, Al: 0.005-0.10%, Ca: 0.0005-0.0050%, Nb: 0.005-0.050%, Ti: 0.005-0.050%, Cu: 0.01-0.50%, Ni: 0.01-0.50%, Cr: 0.01-0.50%, B: 0.0005-0.0050%, N: 0.002-0.010%, and a remainder of Fe and unavoidable impurities.

Abstract: High strength dual-phase stainless steel sheet and steel strip which are excellent in corrosion resistance, the dual-phase stainless steel sheet and steel strip having a Vicker's hardness of 200HV or more and comprising, by mass %, C: 0.02 to 0.20%, Si: 0.10 to 2.0%, Mn: 0.20 to 2.0%, P: 0.040% or less, S: 0.010% or less, Cr: 15.0 to 18.0%, Ni: 0.5 to 4.0%, Sn: 0.05 to 0.50, N: 0.010 to 0.10%, and a balance of Fe and unavoidable impurities. The dual-phase stainless steel sheet and steel strip have a ?p range of 60 to 95, and a ferrite and martensite dual-phase microstructure formed by being heated to the ferrite and austenite dual-phase region, then the austenite phase transforming to martenite in the subsequent cooling process, wherein ?p=420C+470N+23Ni+7Mn+9Cu?11.5Cr?11.5Si?12Mo?7Sn?49Ti?47Nb?52Al+189.

Abstract: A copper alloy material suitable for materials for electronic and electrical equipments such as movable connectors having excellent bending workability and being able to show high electrical conductivity was achieved by a Cu—Co—Si alloy material containing 1.5 to 2.5 wt % of Co and 0.3 to 0.7 wt % of Si, having a Co/Si element ratio of 3.5 to 5.0, containing 3,000 to 150,000 second phase particles per mm2 having diameters of from 0.20 ?m or more to less than 1.00 ?m, having a grain size of 10 ?m or less, an electrical conductivity of 60% IACS or more, and good bending workability. The above alloy material contains 10 to 1,000 second phase particles per mm2 having diameters of from 1.00 to 5.00 ?m, the 0.2% yield strength may be 600 MPa or more, the temperature of hot heating performed after casting and before solution treatment is a temperature that is 45° C. or more higher than the solution treatment temperature selected below, the cooling rate from the temperature at the start of hot rolling to 600° C.

Abstract: Described is a high tensile strength hot rolled steel sheet having high strength and formability, and a manufacturing method. It has tensile strength ?980 MPa and excellent formability, and specifically identified ranges by mass % of C, Si, Mn, P, S, N, Al, Ti, V, Solute V, and Solute Ti; (ii) microstructure with fine carbides dispersion precipitated therein, the fine carbides containing Ti and V and having the average particle diameter <10 nm, as well as volume ratio with respect to the entire microstructure ?0.007; and matrix as ferrite phase having area ratio with respect to the entire microstructure ?97%. C, Ti, V, S and N satisfy (1) Ti?0.08 +(N/14×48+S/32×48) and (2) 0.8?(Ti/48+V/51)/(C/12)?1.2, where “C”, “Ti”, “V”, “S” and “N” represent contents (mass %) of corresponding elements, respectively.

Abstract: The invention relates to a steel plate, the chemical composition of which comprises, the contents being expressed by weight: 0.010%?C?0.20%, 0.06%?Mn?3%, Si?1.5%, 0.005%?Al?1.5%, S?0.030%, P?0.040%, 2.5%?Ti?7.2%, (0.45×Ti)?0.35%?B?(0.45×Ti)+0.70%, and optionally one or more elements chosen from: Ni?1%, Mo?1%, Cr?3%, Nb?0.1%, V?0.1%, the balance of the composition consisting of iron and inevitable impurities resulting from the smelting.

Abstract: A steel plate is provided which has excellent hydrogen induced cracking resistance. The steel plate is suitable for use in a line pipe. The steel plate satisfies a predetermined composition. In a composition of an inclusion contained in the steel and having a width of 1 ?m or more, the ratio (RES/CaS) of the mass of an REM sulfide (RES) to that of a Ca sulfide (CaS) is equal to or more than 0.05, a Zr content of the inclusion is in a range of 5 to 60%, and a Nb content of the inclusion is 5% or less.