Abstract: The present invention provides a hot rolled steel wire rod or bar for machine structural use having, in the as-hot-rolled condition, cold workability equal to that of the conventional wire rods or bars softened through annealing after hot rolling, and a method to produce the same: and relates to a hot rolled steel wire rod or bar for machine structural use, characterized in that; the wire rod or bar is made from a steel consisting of, in weight, 0.1 to 0.5% of C, 0.01 to 0.5% of Si, 0.3 to 1.5% of Mn, and the balance comprising Fe and unavoidable impurities and containing strengthening elements as required; its microstructure consists of ferrite and pearlite; its ferrite crystal grain size number defined under Japanese Industrial Standard (JIS) G 0552 is 11 or higher; and a granular carbide 2 &mgr;m or less in circle-equivalent diameter and having an aspect ratio of 3 or less accounts for a percentage area of 3 to 15%.

Abstract: The present invention provides a steel wire rod for cold forging which can be spheroidizing-annealed in an as hot-rolled state without requiring preliminary drawing and can have high ductility after the spheroidizing annealing, and a method to produce the same: and is characterized in that; the steel contains, by weight, 0.1 to 0.5% of C, 0.01 to 0.5% of Si and 0.3 to 1.5% of Mn, with the balance consisting of Fe and unavoidable impurities, and further contains hardening elements as required; and the steel has a prior austenite grain size number, defined under Japanese Industrial Standard (JIS) G 0551, of 11 or higher, the amount of diffusible hydrogen in the steel measured by the programmed temperature gas chromatography being 0.2 ppm or less, and the hardness being Hv 250 to 700.

Abstract: A steel sheet has composition consisting of 0.003-0.10 wt. % C, not more than 1.0 wt. % Si, 0.05-1.5 wt. % Mn, not more than 0.10 wt. % P, not more than 0.02 wt. % S, 1.5-8.0 wt. % Cr, 0.003-0.10 wt. % Al, at least one of 0.08-0.40 wt. % Ti, 0.08-0.40 wt. % Nb and 0.08-0.40 wt. % V, optionally at least one of Cu up to 2.0 wt. %, Ni up to 2.0 wt. %, 0.01-2.0 wt. % Mo, 0.01-2.0 wt. % W and 0.0003-0.0050 wt. % B and the balance being essentially Fe except inevitable impurities. The steel sheet is good of both a room-temperature strength and a high temperature strength. The new steel sheet is useful as a frame member of a color picture tube for stretching color selecting electrode elements, instead of an expensive ferritic stainless steel.

Abstract: Rolling structure steel, comprising: 0.90-100% by wt. C; 0.95-1.05% by wt Si; 0.25-0.45% by wt Mn; 0.015% by wt. S max.; 0.025% by wt. P max.; 1.30-1.50% by wt. Cr, and 0.17-0.20% by wt. Mo. Preferably this steel is produced by austenising at 860+20° C., quenched in oil and tempered at 240+20° C. In this way steel is obtained having a high rolling contact fatigue strength and dimensional stability at elevated temperature operating conditions.

Abstract: A high strength steel alloy for use in manufacturing railway car components. The alloy has a chemical composition that meets the industry required specifications for B grade steel and exhibits better mechanical properties, such as higher yield and tensile strengths. Secondary benefits of the inventive steel alloy include enhanced weldability and improved fatigue resistance.

Abstract: A low-alloy heat-resistant steel may be used to manufacturing a large element which has uniform superior high temperature properties through a surface layer to a center part. The low-alloy heat-resistant steel comprises carbon in an amount of 0.20 to 0.35% by weight, silicon in an amount of 0.005 to 0.35% by weight, manganese in an amount of 0.05 to 1.0% by weight, nickel in an amount of 0.05 to 0.3% by weight, chromium in an amount of 0.8 to 2.5% by weight, molybdenum in an amount of 0.1 to 1.5% by weight, tungsten in an amount of 0.1 to 2.5% by weight, vanadium in an amount of 0.05 to 0.3% by weight, phosphorus in an amount not greater than 0.012% by weight, sulfur in an amount not greater than 0.005% by weight, copper in an amount not greater than 0.10% by weight, aluminum in an amount not greater than 0.01% by weight, arsenic in an amount not greater than 0.01% by weight, tin in an amount not greater than 0.01% by weight, antimony in an amount not greater than 0.

Abstract: An outer ring 2 as a stationary ring is fabricated with a steel material having the composition as shown under. The steel material contains, as alloying elements, C 0.80 to 1.10 wt %, Si 0.20 to 0.50 wt %, Mn 0.2 to 1.0 wt %. It also contains any two kinds or more of Cr, Mo and V at rates of Cr: 1.2 to 3.5 wt %, Mo: 0.5 to 1.5 wt % and V: 0.2 to 1.0 wt %. The containing rates of Cr, Mo and V satisfy the under mentioned formula (1). It further contains Ti and/or Cu at rates of Ti: 0.05 to 0.20 wt % and Cu: 0.2 to 2.0 wt % 1.8≦[Cr]×0.6+[Mo]×0.5+[V]≦3.0  (1). Accordingly, it is possible to remarkably lengthen the life of a rolling bearing such as a bearing for alternator to be used under high vibration and high load.

Abstract: A heat resistant steel which comprises, by mass %, C: 0.01-0.25%, Cr: 0.5-8%, V: 0.05-0.5%, Si: not more than 0.7%, Mn: not more than 1%, Mo: not more than 2.5%, W: not more than 5%, Nb: not more than 0.2%, N: not more than 0.1%, Ti: not more than 0.1%, Ta: not more than 0.2%, Cu: not more than 0.5%, Ni: not more than 0.5%, Co: not more than 0.5%, B: not more than 0.1%, Al: not more than 0.05%, Ca: not more than 0.01%, Mg: not more than 0.01%, Nd: not more than 0.01%, with Fe and impurities accounting for the balance, the chemical composition of which satisfies the relations C−0.06×(Mo+0.5 W)≧0.01 and Mn+0.69×log(Mo+0.5 W+0.01)≦0.60 wherein the symbols for elements represent the contents, on the % by mass basis, of the elements in the steel, and in which, among precipitates inside grains, precipitates having an average diameter of not more than 30 nm are present at a density of not less than 1/&mgr;m3.

Abstract: The present invention relates to an ultra-high strength cold rolled steel sheet having 880 to 1170 MPa of tensile strength, that consists essentially of 0.01 to 0.07% C, 0.3% or less Si, 0.1% or less P, 0.01% or less S, 0.01 to 0.1% sol.Al, 0.0050% or less N. 1.6 to 2.5% of sum of at least one element selected from the group consisting of Mn, Cr, and Mo, by mass, and balance of Fe, and that has an inner zone deeper than 10 &mgr;m from the surface of the steel sheet being substantially martensitic single phase structure. Since the steel sheet has hole expansion ratio of 75% or more, specified by the Standard of Japan Iron and Steel Federation, JFST1001-1996, tensile strength in a range of from 880 to 1170 MPa, and excellent mechanically joining property, it is suitable for automobile seat frames.

Abstract: Disclosed is a heat resistant steel casting, comprising C, 0.15-0.3%, Si, 0.1-0.30%, Mn, 0.01-0.1%, Cr, 2.0-2.5%, Mo, 0.3-0.8%, V, 0.23-0.3%, W, 1.6-2.6%, N, 0.005-0.03%, B, 0.001-0.004%, impurity elements including Ni not larger than 0.2%, P not larger than 0.03% and S not larger than 0.01%, B equivalent determined by B+0.5N given below being not larger than 0.02%, Mo equivalent determined by Mo+0.5W given below falling within a range of between 1.4% and 2.0%, and C equivalent determined by C+Mn/6+Si/24+Ni/40+Cr/5+Mo/14+V/14 given below being not smaller than 0.65%, and balance of iron wherein a precipitated phase consisting of a M23C6 carbide, a M7C3 carbide, and MX carbonitride is a texture finely precipitated in a matrix phase, and a ratio of the precipitated phase to the matrix phase falls within a range of between 0.6% and 1.0%.

Abstract: This invention relates to a method of manufacturing an improved ferritic or martensitic alloy based on iron and chromium strengthened by a dispersion of oxides, commonly called an Oxide Dispersion Strengthened or ODS alloy, and, more particularly to a method of manufacturing a ferritic or martensitic ODS alloy with large grains based on iron and chromium which has a single phase ferritic or martensitic matrix having an isotropic microstructure and a grain size that is sufficient to guarantee mechanical strength compatible with a use of this alloy at high temperature and/or under neutron irradiation. According to the invention, the method comprises slow cooling of an austenite at a cooling rate less than or equal to the critical cooling rate for transformation of this austenite into ferrite.

Abstract: At least any one of a bearing member (inner race, outer race and rolling element) is formed with a steel material containing 0.2 to 1.2 wt % of C, 0.7 to 1.5 wt % of Si, 0.5 to 1.5 wt % of Mo, 0.5 to 2.0 wt % of Cr, and 12 ppm or less of O. The bearing member is treated with carbonitriding, and thereafter, quenching and tempering so as to provide carbon concentration in the steel surface being 0.8 to 1.3 wt % and nitrogen concentration on the same being 0.2 to 0.8 wt %.

Abstract: The present invention is directed to a steel product for machine structural use having excellent machinability and to a structural steel part for machinery manufactured from the steel product. More particularly, the invention is directed to a steel product for machine structural use having excellent machinability, particularly bringing about excellent “drill life” and exhibiting excellent “chip disposability” in the course of drilling, as well as to a structural steel part for machinery manufactured from the steel product. The steel product for machine structural use has a chemical composition comprising, in mass percent, C: 0.05% to 0.55%; Si: 0.50% to 2.5%; Mn: 0.01% to 2.00%; P: not greater than 0.035%; S: 0.005% to 0.2%; N: not greater than 0.0150%; elements to be added as needed: Cu, Ni, Cr, Mo, V, Nb, Ti, B, Al, Bi, Ca, Pb, Te, Nd, and Se; −23C+Si(5−2Si)−4Mn+104S−3Cr−9V+10≧0; 3.2C+0.8Mn+5.2S+0.5Cr−120N+2.

Abstract: An alloy steel, includes 0.12 to 0.25 wt. % C, 0.40 wt. % or less Si, 1.20 to 1.80 wt. % Mn, 0.025 wt. % or less P, 0.010 wt. % or less S, 0.01 to 0.06 wt. % Al, 0.20 to 0.50 wt. % Cr, 0.20 to 0.50 wt. % Mo, 0.03 to 0.10 wt. % V, 0.20 wt. % or less Cu, 0.02 wt. % or less N, 0.30 to 1.00 wt. % W, and the balance iron and incidental impurities, for making high-strength, weldable seamless steel tubes for structural application, through a hot rolling process and subsequent quenching and tempering.

Abstract: Provided is a non heat-treated steel that requires no particular controls over cooling rates and no aging treatments after hot working, that can sufficiently increase tensile strength, yield strength and toughness even at lightly deformed parts, and furthermore, that has excellent material anisotropy and machinability as an alloy steel for machine structures. In other words, it is a non heat-treated steel that contains: C: more than 0.05 mass % to less than 0.10 mass %; Si: 1.0 mass % or less; Mn: more than 2.2 mass % to 5.0 mass %; S: less than 0.020 mass %; Cu: more than 1.0 mass % to 3.0 mass %; Ni: 3.0 mass % or less; Cr: 0.01 to 2.0 mass %; Al: 0.1 mass % or less; Ti: 0.01 to 0.10 mass %; B: 0.0003 to 0.03 mass %; N: 0.0010 to 0.0200 mass %; O: 0.0060 mass % or less; and the balance Fe and inevitable impurities, and that the steel structure is bainitic having block structures at 10% or more in area ratios.

Abstract: Multi-layer material for die cast tooling component includes a low to medium carbon steel with alloying amounts of vanadium, manganese and molybdenum, quenched to at least 10 Bar and nitrocarburized to achieve a multiple layer structure with at least an outside lubricious layer, retaining hardness in the core. The method for producing the multi-layer material includes alloying the core material, forming into desired net shape, quenching and nitrocarburizing. A high endurance die cast tooling component for use in tooling applications includes a core material of at least 80 percent by volume martensite with no more than 15 percent by volume of retained austenite with at least two surface layers for lubricity and endurance. The tooling components may include shot sleeves, plungers, plunger tips, bushings, and core pins.

Abstract: The present invention provides a high carbon steel wire remarkably excellent in wire-drawability and fatigue resistance after wire drawing with a low cost due to reduced use of costly alloys. A high carbon steel wire according to the present invention is one excellent in wire-drawability and fatigue resistance after wire drawing, characterized in that; the total oxygen content is 15 to 50 ppm; among non-metallic inclusions included therein, the number of inviscid inclusions is 1.

Abstract: In order to produce elements for furnaces, reactors or conduits on the walls of which coke can appear, steels are used with a composition which is adapted to resist coking comprising, by weight, at most 0.25% of C, 1.5% to 5% of Si, 4% to 10% of Cr, 0.5% to 2% of Mo, 0.3% to 1% of Mn, at most 0.030% of S and at most 0.03% of P, the complement to 100% being essentially iron. Novel steel compositions for use in these applications are those which comprise, by weight, at most 0.25% of C, more than 2.5% and up to 5% of Si, 4% to 10% of Cr, 0.5% to 2% of Mo, 0.3% to 1% of Mn, at most 0.03% of S and at most 0.03% of P, the complement to 100% being essentially iron.

Abstract: The present invention provides a ferritic steel sheet, the quasi-static strength of which is enhanced and further the dynamic strength of which is not lowered. There is provided a ferritic steel sheet excellent at strain rate sensitivity characterized in that: Co and/or Cr are contained at pot less than 0.01 mass % and not more than 4.0 mass % in total in the state of solid solution in the ferrite phase.

Abstract: A steel sheet having a composition comprising C: 0.05-0.20 mass %, Si: 0.3-1.8 mass %, Mn: 1.0-3.0 mass %, Fe of the balance and inevitable impurities is subjected to a primary step of primary heat treatment and subsequent rapid cooling to Ms point or lower, a secondary step of secondary heat treatment and subsequent rapid cooling, and a tertiary step of galvanizing treatment and rapid cooling, so as to turn the structure of the steel sheet into a composite structure of 20% or more by volume of tempered martensite, 2% or more by volume of retained austenite, ferrite and a low-temperature transformation phase. A galvanized layer is deposited on the surface of the steel sheet. It is preferred to cool the steel sheet to 300° C. at a cooling rate of 5 ° C./sec. or more after the galvanizing treatment. After the galvanizing treatment, alloying treatment may be conducted.

Abstract: This invention provides a steel for cold forging, excellent in surface layer hardness and softening properties by annealing, which contains, in terms of wt %, C: 0.1 to 1.0%, Si: 0.1 to 2.0%, Mn: 0.01 to 1.50%, P: not greater than 0.100%, S: not greater than 0.500%, sol. N: not greater than 0.005% and the balance consisting of Fe and unavoidable impurities, wherein a pearlite ratio in the steel structure is not greater than 120×(C %) % and the outermost surface layer hardness is at least 450×(C %)+90 in terms of the Vickers hardness HV, and a production method thereof. The invention provides also a steel for cold forging, which has a structure wherein a ratio of graphite amount to the carbon content in the steel exceeds 20%, a mean grain diameter of graphite is not greater than 10×(C %)⅓ &mgr;m and a maximum grain diameter is not greater than 20 &mgr;m.

Abstract: An iron-based sintered alloy material for a valve seat, in which hard particles are dispersed in a base matrix phase, is characterized in that the base matrix phase is comprised of 5 to 40 vol. % of a pearlite phase and 10 to 40 vol. % of a high-alloy diffused phase and particles having hardness of Hv 600 to 1300 and particle diameter of 10 to 150 &mgr;m are dispersed as the hard particles, by the amount of 10 to 30 vol. %, in the base matrix phase. The hard particles are preferably at least one type of particles selected from the group consisting of intermetallic compound particles of Mo—Ni—Cr—Si—Co; intermetallic compound particles of Cr—Mo—Co; Fe—Mo alloy particles; and carbide-precipitated particles.

Abstract: The present invention provides a spring steel showing a sufficient reduction in area and an impact toughness while the steel has a high strength, in particular a tensile strength as high as at least 1,500 Mpa. A high toughness spring steel according to the present invention comprises, based on mass, 0.45 to 0.85% of C, 0.9 to 2.5% of Si, 0.1 to 1.2% of Mn, 0.1 to 2.0% of Cr, 0.005 to 0.07% of Ti, 0.001 to 0.007% of N, the Ti content being greater than four times the N content in terms of percent by mass, 0.0005 to 0.0060% B, at least one of 0.0005 to 0.01% Mg, 0.0005 to 0.01% La, and 0.0005 to 0.01% Ce, P and S with restrictive contents of less than 0.020% and less than 0.020%, respectively, and the balance of Fe and unavoidable impurities, and selectively contains V, Nb, Ni, Mo and Cu. The percent area of oxides and sulfides is not more than 0.1%.

Abstract: This invention provides a boiler steel pipe that exhibits a high creep rupture strength on a high-temperature high-pressure side and is excellent in electric weldability, and an electric welded boiler steel pipe having fewer defects at an electric welded portion. The boiler steel contains, in terms of wt %, C: 0.01 to 0.20%, Si: 0.01 to 1.0% and Mn: 0.10 to 2.0%, contains further Cr: 0.5 to 3.5%, and limits p≦0.030%, S≦0.010% and 0≦0.20%, wherein a weight ratio of (Si %)/(Mn %) or (Si %)/(Mn %+Cr %) is from 0.005 to 1.5, the balance Fe and unavoidable impurities, and the melting point of the mixed oxide of SiO2 and MnO, or SiO2, MnO and Cr2O3, is not higher than 1,600° C. The oxide that would otherwise result in the defects of the electric welded portion is molten and squeezed out as slag components.

Abstract: The steel of the present invention satisfies the following requirement for non-metallic inclusion area: when the steel is melted by an electron beam under the conditions of an irradiation rate of 200 to 600 J/sec., an irradeation time of 10 to 25 seconds, and an irradeation energy of 5000 J or more, the area of non-metallic inclusions existing in the surface of the sample after solidification falls within 15,000 &mgr;m2 or less. The steel exhibits excellent cold workability and fatigue properties.

Abstract: Steel for the manufacture of a component for bearings, the chemical composition of which comprises, by weight: 0.6%≦C≦1.5%; 0.4%≦Mn≦1.5%; 0.75%≦Si≦2.5%; 0.2%≦Cr≦2%; 0%≦Ni≦0.5%; 0%≦Mo≦0.2%; 0%<Al≦0.05%; S≦0.04%; the balance being iron and impurities resulting from smelting and the composition furthermore satisfying the relationships: Mn≦0.75+0.55×Si and Mn≦2.5−0.8×Si. Process for the manufacture of a bearing component.

Abstract: A high strength, low alloy, heat resistant steel having excellent weldability has an average crystal grain diameter of at most 110 &mgr;m and consists essentially of, by mass %: C: 0.03-0.15%, Si: at most 1%, Mn: at most 2%, P: at most 0.03%, S: at most 0.03%, Ni: at most 0.5%, Cu: at most 0.5%, Cr: 1.8-2.8%, V: 0.1-0.3%, Nb: 0.01-0.08%, Mo: 0.05-0.35%, W: 1.2-1.8%, Ti: 0.001-0.05%, B: 0-0.02%, Al: at most 0.1%, O: at most 0.1%, N: in an amount satisfying the formula [%N]≦[%Ti]+5[%B]+0.004, and a remainder of unavoidable impurities.

Abstract: Disclosed is a steel alloy that includes as alloying ingredients carbon, silicon, manganese, aluminum, and oxygen. In accordance with this embodiment of the disclosed invention, carbon is present in an amount ranging from 0.40 to 0.77 wt. %; silicon is present in an amount ranging from 0.40 to 1.20 wt. %; manganese is present in an amount ranging from 0.40 to 1.20 wt. %, aluminum is present in an amount ranging from 0.003 to 0.060 wt. %; and oxygen is present in an amount ranging up to 0.0030 wt. %. Also disclosed is a railway wheel that comprises a hub, a rim, and a connecting plate. In accordance with this embodiment of the disclosed invention, at least the rim, and preferably the entire railway wheel, is composed of the disclosed steel composition.

Abstract: The invention provides a thin high-strength hot-rolled steel sheet with a thickness of not more than 3.5 mm which has excellent stretch flangeability and high uniformity in both shape and mechanical properties of the steel sheet, as well as a method of producing the hot-rolled steel sheet. A slab containing C: 0.05-0.30 wt %, Si: 0.03-1.0 wt %, Mn: 1.5-3.5 wt %, P: not more than 0.02 wt %, S: not more than 0.005 wt %, Al: not more than 0.150 wt %, N: not more than 0.0200 wt %, and one or two of Nb: 0.003-0.20 wt % and Ti: 0.005-0.20 wt % is heated at a temperature of not higher than 1200° C. The slab is hot-rolled at a finish rolling end temperature of not lower than 800° C., preferably at a finish rolling start temperature of 950-1050° C. A hot-rolled sheet is started to be cooled within two seconds after the end of the rolling, and then continuously cooled down to a coiling temperature at a cooling rate of 20-150° C./sec. The hot-rolled sheet is coiled at a temperature of 300-550° C.

Abstract: A 590 MPa-class rolled steel shape of high strength and excellent toughness for use as a building structural member and a method of producing the high-tensile rolled steel shape are provided. Strength optimization by an alloy that elevates hardenability, texture refinement obtained by fine dispersion of Ti oxides and TiN owing to Ti addition, precipitation strengthening by Cu addition, and formation of a fine bainite texture by temperature-controlled rolling, cooling control and the like enable a high-strength, high-toughness rolled steel shape of high-strength and excellent toughness having mechanical properties of a tensile strength of not less than 590 MPa, a yield strength or 0.2% proof strength of not less than 440 MPa and a Charpy impact absorption energy at 0° C. of not less than 47 J, and method of producing the same.

Abstract: A high-strength, high damage-resistant rail made of 0.6 to 0.85 wt % C, 0.1 to 1.0 wt % Si, 0.5 to 1.5 wt % Mn, 0.035 wt % or less P, 0.040 wt % or less S, and 0.05 wt % or less Al, with the balance being Fe and inevitable impurities, and having corner and head side portions having a Brinell hardness of 341 to 405, and a head top portion in which a Brinell hardness of a site 20-mm distant from the central portion of the head top portion in a width direction is 341 to 405, and a hardness of the central portion of the head top portion is at least 10 lower in Brinell hardness than that of the site 20-mm distant from the central portion.

Abstract: A heat-resistant steel contains 0.1-3 mass % of Cr and satisfies the following equation: 0.1≦Nb+Mo+V and MX-type complex precipitates formed inside microcrystalline grains contain 30 mass % or more of Mo and 7 mass % or more of Nb. Also provided is a process for producing the alloy steel product involving casting, forging, hot rolling, normalizing, optionally direct quenching, cooling at a predetermined cooling rate, and tempering.

Abstract: A heat resistant high Cr ferritic steel comprising, in mass %, C : 0.02 to 0.15%, Mn: 0.05 to 1.5%, P : 0.03% or less, S : 0.015% or less, Cr: 8 to 13%, W : 1.5 to 4%, Co: 2 to 6%, V : 0.1 to 0.5%, Ta: 0.01 to 0.15%, Nb: 0.01 to 0.15%, Nd: 0.001 to 0.2%, N : 0.02% or less, B : 0.0005 to 0.02%, Al: 0.001 to 0.05%, Mo: 0 to 1%, Si: 0 to 1%, Ca: 0 to 0.02%, La: 0 to 0.2%, Ce: 0 to 0.2%, Y : 0 to 0.2%, Hf: 0 to 0.2%, the contents of Nd and N satisfying the formula: Nd(%) ≦5×N(%)+0.1(%), and the balance being Fe and incidental impurities. The steel is excellent in high temperature long term creep strength and toughness and can be used under the ultra super critical steam condition such as a temperature of 625° C. and a pressure of 300 atm.

Abstract: This invention provides an oil-tempered wire having high strength (tensile strength of not less than 1960 MPa) and excellent workability and specifically provides a steel wire for high-strength springs comprising as steel components, in weight percent, C   0.4-0.7% Si   1.2-2.5% Mn   0.1-0.5% Cr   0.4-2.0% Al 0.0001-0.005%, and being limited to P not more than 0.015% and S not more than 0.015%, the balance being Fe and unavoidable impurities, the steel wire having no nonmetallic inclusions of a size greater than 15 &mgr;m, a tensile strength of not less than 1960 MPa, and a yield ratio (&sgr;0.2/&sgr;B) of not less than 0.8 and not greater than 0.9 or a yield ratio (&sgr;0.2/&sgr;B) of not less than 0.8 and an amount of residual austenite of not greater than 6%. This invention also provides a method of producing the steel wire.

Abstract: Process for manufacturing a pressure vessel intended to work under pressure between −40° C. and 200° C. in the presence of H2S under conditions defined by the NACE MR 0175-97 standard, in which: components of the vessel are manufactured from a steel of chemical composition: 0.03%≦C≦0.15%; 0%≦Si≦0.5%; 0.4%≦Mn≦2.5%; 0.5%≦Ni≦3%; 0%≦Cr≦1%; 0%≦Mo≦0.5%; 0%≦Al≦0.070%; 0%≦Ti≦0.04%; 0%≦B≦0.004%; 0%≦V≦0.02%; 0%≦Nb≦0.05%; Cu≦1%; S≦0.015%; P≦0.03%; the balance being iron and impurities resulting from the smelting operation; CET=C+(Mn+Mo)/10+(Cr+Cu)/20+Ni/40<0.35; 800/500 cct<10 s; the components being quenched and tempered; the structure is martensitic or martensitic-bainitic with less than 10% ferrite; the temper temperature is <680° C. Optionally, a stress-relieving operation is carried out at a temperature ≧595° C.

Abstract: The invention concerns a method for manufacturing steel wire comprising the following steps: manufacturing a reinforcing wire of sizeable length by rolling or hot wire drawing from steel containing the following elements: 0.18% to 0.45 % C, 0.4% to 1.8% Mn, 1% to 4% Cr, 0.1% to 0.6% Si, 0% to 1.5% Mo, 0% to 1.5% Ni, at most 0.01% S and 0.02% P, the reinforcing wire having, after being rolled or hot drawn, a temperature at least higher than the AC3 temperature, preferably by 50 to 200° C. and in particular by 100 to 150° C.; winding the wire in reels before air cooling the raw manufacturing wire to obtain a HRC hardness not less than 40 and preferably higher than 45. In a variant, the method consists in quenching and tempering so that the wire has a hardness between 20 HRC and 35 HRC. The invention also concerns a reinforcing wire and a flexible tube for carrying effluents.

Abstract: In a processing method for strengthening carbon steel materials, a carbon steel having an average hardness in the range of HRC 50 to 57 and a bainite structure is subjected to a tension working so as to provide a residual strain of at least 0.3% to the carbon steel. The tensile load in the tension working exceeds the yield point, and is 95% or less of the fracture load.

Abstract: The invention relates to a tool steel composition comprising, expressed in weight percentage: C 0.3%-0.4% Cr 2.0%-4.0% Mo 0.8%-3.0% V 0.4%-1.0% W 1.5%-3.0% Co 1.0%-5.0% Si 0 %-1.0% Mn 0 %-1.0% Ni 0 %-1.0% the balance being mainly constituted by iron and inevitable impurities, and also to a method of preparing the composition.

Abstract: A hot rolled high strength steel sheet having a satisfactory strength-elongation balance and an stretch frangibility and with excellent formability comprising a steel, which contains: C :0.05 ˜ 0.15% Si :0.5 ˜ 2.0% Mn :0.5 ˜ 2.0% P :0.05% or less S :0.010% or less Al :0.005 ˜ less than 0.10%, and the balance of Fe and inevitable impurities, and in which the metal structure mainly comprises three phases of ferrite, retained austenite and bainite, the amount of the ferrite [V(F)] is 60˜95 area %, the amount of the retained austenite [V(&ggr;)] is 3˜15 vol %, the amount of the bainite [V(B)] in the area ratio is 1.5 times or more of the amount of the retained austenite [V(&ggr;)], and the average hardness of the bainite is 240-400 Hv.

Abstract: An outer ring 2 as a stationary ring is fabricated with a steel material having the composition as shown under. The steel material contains, as alloying elements, C 0.80 to 1.10 wt %, Si 0.20 to 0.50 wt %, Mn 0.2 to 1.0 wt %. It also contains any two kinds or more of Cr, Mo and V at rates of Cr: 1.2 to 3.5 wt %, Mo: 0.5 to 1.5 wt % and V: 0.2 to 1.0 wt %. The containing rates of Cr, Mo and V satisfy the under mentioned formula (1). It further contains Ti and/or Cu at rates of Ti: 0.05 to 0.20 wt % and Cu: 0.2 to 2.

Abstract: A low alloy steel for oil country tubular well which has a yield stress of 110 ksi or above, and excellent sulfide stress cracking resistance. The low alloy steel comprises, by weight, 0.2 to 0.35% carbon, 0.2 to 0.7% chromium, 0.1 to 0.5% molybdenum, 0.1 to 0.3% vanadium, 0 to 0.5% silicon, 0 to 1% manganese, 0 to 0.1% aluminum, 0 to 0.1% niobium, 0 to 0.05% titanium, 0 to 0.005% boron, 0 to 0.1% zirconium, 0 to 1% tungsten, 0 to 0.01% calcium, 0.025% or less phosphorus, 0.01% or less sulfur, 0.01% or less nitrogen, and 0.01% or less oxygen. The low alloy steel further comprises a total amount of precipitated carbides between about 2 to 5% by weight, and a ratio of the MC type carbide to the total amount of the precipitated carbides is between about 8 to 40% by weight.

Abstract: High-strength bainitic steel rails have improved resistances to surface fatigue failures and wear required of the head of rails for heavy-load service railroads. The high-strength bainitic steels rails having excellent resistances to surface fatigue failures and wear contain constituents of specific ranges and consisting of bainitic structures at least in part are characterized in that the total area occupied by carbides whose longer axes are 100 to 1000 nm in a given cross section of said bainitic structures accounts for 10 to 50 percent thereof.

Abstract: An object of the present invention is to provide a corrosion resistant steel excellent in strength and low temperature toughness as well as resistance to corrosion by carbon dioxide and seawater, and most suitable for oil well steel pipes and line pipes for production and transportation of gas, petroleum, etc. used in the field of energy, or a steel for plants, and corrosion resistant oil well steel pipes. The corrosion resistant steel and the corrosion resistant oil well steel pipes comprise, based on weight, up to 0.30% of C, up to 1.0% of Si, 0.2 to 2.0% of Mn, 2.1 to less than 5.0% of Cr, up to 0.03% of P, up to 0.02% of S, up to 0.10% of Al, up to 0.015% of N, optionally containing Cu, Ni, Mo, Ti, Nb and B, and the balance of Fe and unavoidable impurities, and have a martensitic structure as their metallic structure.

Abstract: A high speed tool steel and a manufacturing method therefor are disclosed, in which carbides are formed in the matrix in a uniform manner, thereby obtaining a high toughness and a high abrasion resistance. The high speed tool steel according to the present invention includes a basic composition of WaMobCrcCodVxCyFez where the subscripts meet in weight %: 5.0%≦a≦7.0%, 4.0%≦b≦6.0%, 3.0%≦c≦5.0%, 6.5%≦d≦9.5%, 2.2% ≦x≦8.3%, 1.1%≦y≦2.18%, and 66.52%≦z≦73.7%. The final structure has carbides uniformly distributed within a martensite matrix, which are mainly MC and M6C carbides. The method includes the steps of melting the above-defined alloy composition, gas spraying the melted alloy to form a bulk material, heat treating the bulk material to decompose the M2C carbides to stabilize M6C carbides and hot working the heat treated bulk material to a desired shape.

Abstract: A steel alloy for pipes, sheet metal or sections for manufacturing bumpers for motor vehicles, wherein the steel alloy contains, in percent by weight, 0.17 to 0.20% carbon, 1.70 to 2.20% manganese, 0.45 to 0.75% chromium, 0.10 to 0.35% molybdenum, 0.03 to 0.05% aluminum, 0.01 to 0.05% titanium, 0.01 to 0.12% vanadium, 0.025 to 0.06% niobium, 0.0001 to 0.10% zirconium, 0.002 to 0.003% Boron, 0.01 to 0.04% nitrogen, up to 0.15% silicon and up to 0.025% phosphorus and up to 0.010% sulfur, wherein the remainder is iron including impurities caused from smelting, and wherein the sum of the alloy components titanium, vanadium and niobium is between 0.16 and 0.25%.

Abstract: A cutting tool having cutting edges made of a high speed tool steel exhibiting very high wear and anti-chipping resistances, and sufficient toughness is provided. The high speed tool steel consists essentially of by weight C:0.6 to 1.8%, Si:1.2% max, Mn:0.5% max, Cr:3.5 to 5.0%, Mo:10% max, W:21% max, V:2 to 4% and Co:7 to 10%, the balance being Fe and incidental impurities, and the steel of the cutting edge comprise MC-type carbide grains each having a maximum equal value diameter of a circle ranging substantially 5 to 14 &mgr;m, and the MC-type carbide grains having an equal value diameter of the circle ranging substantially 5 to 14 &mgr;m have a ratio between short and long diameters ranging over substantially 0.3.

Abstract: A rolling bearing comprises races including an inner race and an outer race formed of an alloy steel material; and a plurality of rolling elements formed of a ceramic material and interposed between the inner race and the outer race in such a manner as to be capable of rolling, wherein at least one of the inner race and the outer race is formed of an alloy steel containing 0.7-1.5 wt. % Si, 0.5-2.0 wt. % Cr, and 0.5-2.0 wt. % Mo in a steel, and is subjected to carbonitriding treatment on the surface of the alloy steel material. The rolling bearing excels in the durability and heat resistance even if it is used in a high-temperature high-speed environment, and does not cause a noise fault.

Abstract: This invention provides a ferritic heat-resistant steel that can improve HAZ softening resistance, can omit heat-treatment after welding and can reduce the construction cost of a power generation plant. This ferritic heat-resistant steel contains C: 0.01 to 0.06%, Si: 0.02 to 0.80%, Mn: 0.20 to 1.50%, Cr: 0.50 to 3.00%, Mo: 0.01 to 1.50%, W: 0.01 to 3.50%, V: 0.02 to 1.00%, Nb: 0.01 to 0.50%, N: 0.001 to 0.06%, B: 0.0003 to 0.008%, Ti: 0.001 to 0.5%, Zr: 0.001 to 0.5%, or containing one of Cu: 0.1 to 2.0%, Ni: 0.1 to 2.0% and Co: 0.1 to 2.0% either individually or in combination, and limiting P to not greater than 0.030%, S to not greater than 0.010% and O to not greater than 0.020%, wherein a weight ratio of TiN and BN in the steel is controlled to 1 to 100 in terms of a value (TiN+ZrN %)/(BN %), and a mean grain diameter of BN is not greater than 1 .mu.m.

Abstract: This wire stock is made of a microalloyed steel having a carbon content of between 0.2% and 0.6% by weight and furthermore containing at least one alloying element selected from the group consisting of vanadium, molybdenum and chromium, in a proportion, by weight, of at least 0.05% and at most 0.5% of said alloying element or of the combination of said alloying elements. Such wire stocks are manufactured in order to produce, by deformation and heat treatment, a ready-to-use wire which is used, for example, to reinforce articles made of plastics or made of rubber, especially tire covers, plies, belts, hoses.

Abstract: A process for producing an SOI substrate is disclosed which is useful for saving resources and lowering production cost. Further, a process for producing a photoelectric conversion device such as a solar cell is disclosed which can successfully separate a substrate by a porous Si layer, does not require a strong adhesion between a substrate and a jig, and can save resources and lower production cost. In a substrate having a porous layer on a nonporous layer and further having on the porous layer a layer small in porosity, the nonporous layer and the layer small in porosity are separated by the porous layer to form a thin film. A metal wire is wound around a side surface of the substrate, and a current is made to flow into the metal wire to generate a heat from the metal wire and transfer the heat preferentially to the porous layer, thus conducting the separation.