This concrete structure is provided with: a first concrete member having a first facing surface; a second concrete member having a second facing surface and disposed so that the first facing surface and the second facing surface face each other; a connection section filled into the gap between the first facing surface and the second facing surface; and a tension material which is disposed within the connection section so as to extend along the first facing surface and the second facing surface, and to which a tensile force is applied in a longitudinal direction.
A concrete structure comprises a first concrete member, a second concrete member, a sheath that is disposed in a through-hole passing through from the first concrete member to the second concrete member, a tension part that is inserted throughout the entire length of the sheath and that is subject to tensile force, an attachment fixture that attaches the tension part to the first concrete member or the second concrete member, and an anticorrosion part that covers the attachment fixture. The tension part includes a stranded wire and a first cover layer that covers the outer circumference of the stranded wire. The space between the sheath and the tension part is not filled with grout material.
Stranded wire in which a plurality of steel wires form a strand is provided with, in a cross-section perpendicular to the longitudinal direction, a center wire, which is a steel wire, a plurality of first peripheral wires, which are steel wires in contact with the center wire and disposed in an arrangement surrounding the outer peripheral side of the center wire, and a plurality of second peripheral wires, which are steel wires in contact with the first peripheral wires, disposed in an arrangement surrounding the outer peripheral side of the area wherein the first peripheral wires are disposed, and having higher stress at yield than the center wire and first peripheral wires. The center wire and first peripheral wires are in surface contact. The first peripheral wires and second peripheral wires are in surface contact.
Provided is an electrode wire for a wire-discharge machining, the wire comprising: a core wire section which is made of steel; and a coating layer which covers the outer circumference side of the core wire section, is made of a copper/zinc alloy, and is disposed so as to include the surface of the electrode wire for wire-discharge machining. The coating layer is composed of a γ monophase. The surface roughness Ra of the coating layer in the circumferential direction is 0.08 µm or less. The surface roughness Ra of the coating layer in the longitudinal direction is 0.08 µm or less.
An oil tempered wire has a composition that includes one or more strengthening elements selected from 0.50 – 0.90% by mass C, 0.02 – 0.50% by mass V, 0.01 – 0.50% by mass Ta, 0.01 – 0.50% by mass Nb, 0.02 – 0.50% by mass Mo, and 0.02 – 1.00% by mass W, as well as 0.80 – 3.00% by mass Si, 0.40 – 1.00% by mass Mn, and 0.40 – 2.00% by mass Cr, with the remainder being Fe and impurities. The oil tempered wire is provided with a carbide that includes the strengthening element. The total content of the strengthening element in the carbide that includes the strengthening element is at least 10% in a mass proportion of the total content of the strengthening element. The average particle size of the carbide that includes the strengthening element is 30 nm or less.
A steel wire is constituted from steel formed from 0.7 – 1.0% by mass carbon, 0.12 – 0.32% by mass silicon, 0.3 – 0.9% by mass manganese, with the remainder being iron and unavoidable impurities. The total decarbonized layer depth in a cross-section perpendicular to the longitudinal direction of the steel wire is 0.5% or less of the diameter. The difference in the maximum value and minimum value for hardness on a straight line passing through the center of gravity in a cross-section perpendicular to the longitudinal direction of the steel wire is 50 HV or less.
C22C 38/04 - Ferrous alloys, e.g. steel alloys containing manganese
F16F 1/02 - Springs made of steel or other material having low internal friction; Wound, torsion, leaf, cup, ring or the like springs, the material of the spring not being relevant
C21D 7/06 - Modifying the physical properties of iron or steel by deformation by cold working of the surface by shot-peening or the like
C21D 9/02 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for springs
C21D 9/52 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for strips
Provided is a tire in which a plurality of belt layers are overlapped in the radial direction. The belt layers have a plurality of steel cords and rubber which are arranged parallel in rows. The steel cords have a 1×4 structure in which 4 filaments are twisted together. The tire has a tensile stiffness×ends of 10,000-20,000 N/%, and an interface stiffness of 2.5-5.0 MPa.
B60C 9/20 - Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
B60C 9/00 - Reinforcements or ply arrangement of pneumatic tyres
D07B 1/06 - Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core
This twisted wire for a wire harness has a first wire strand, and a second wire strand twisted together with the first wire strand and comprising copper or a copper alloy. The first wire strand has a core portion comprising stainless steel, and a cover layer covering the core portion and comprising copper or a copper alloy.
Disclosed is an management method for managing a PC stranded wire with an optical fiber comprising: a PC steel stranded wire formed by twisting a plurality of PC steel strands; and an optical fiber arranged along the twists in the PC steel stranded wire. This management method is provided with a step for measuring propagation loss of scattered light from light incident on the optical fiber and a step for detecting abnormalities in the PC steel stranded wire with an optical fiber on the basis of the propagation loss measured in the step for measuring propagation loss.
A steel spring wire is configured from steel, which consists of 0.5 mass% to 0.8 mass% of carbon, 1.0 mass% to 2.5 mass% of silicon, 0.2 mass% to 1.0 mass% of manganese, and 0.5 mass% to 2.5 mass% of chromium, the balance being made of iron and unavoidable impurities, and which has a tempered martensite structure. The hardness of a surface layer region, which is the region within 10 µm of the outer circumferential surface, is harder than the region that is not the surface layer region by only greater than 0 HV to 50 HV.
The purpose of the present invention is to provide a tire that is lightweight and has outstanding riding comfort while suppressing increases in cost. In the present invention, a plurality of belt layers 7 are layered in the radial direction. Each of the belt layers 7 comprises a plurality of steel cords 10, disposed in parallel in a single line, and rubber 11. Each of the steel cords 10 has a one-by-four structure in which four filaments 20 are twisted together, and if the distance between the centers of the steel cords 10 in at least two belt layers 7 that are radially adjacent is T and the average diameter of virtual circumscribed circles of the one-by-four structure steel cords 10 is D, 1.25≤T/D≤2.25.
B60C 9/20 - Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
B60C 9/00 - Reinforcements or ply arrangement of pneumatic tyres
D07B 1/06 - Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core
An oil temper wire comprising a steel wire and a lubricating coating coated onto the outer circumference of the steel wire, wherein the lubricating coating contains a lubricating component resin and a binder resin, the lubricating component resin being at least one resin selected from polyacetal, polyimide, melamine resin, acrylic resin and fluororesin, the adhesion amount of the lubricating coating being 1.0 g/m2 to 4.0 g/m2, and the surface roughness Rz of the steel wire being 8.0 μm or less.
F16F 1/02 - Springs made of steel or other material having low internal friction; Wound, torsion, leaf, cup, ring or the like springs, the material of the spring not being relevant
Provided is a steel cord provided with a steel wire and a plating layer having Cu, Zn, and Co for covering the steel wire, the Cu and Zn being alloyed, and areas covered by Co and areas not covered by Co coexisting on the topmost surface of the plating layer.
A tire having a rubber body in which a steel cord is embedded, wherein a layer comprising ZnxCoy is formed at the boundary of the steel cord and the rubber body, and x+y is 5/6 to 1 inclusive.
The chemical composition of this high-strength PC steel wire comprises, in mass%, C: 0.90-1.10%, Si: 0.80-1.50%, Mn: 0.30-0.70%, P: 0.030% or less, S: 0.030% or less, Al: 0.010-0.070%, N: 0.0010-0.010%, Cr: 0-0.50%, V: 0-0.10%, B: 0-0.005%, Ni: 0-1.0%, Cu: 0-0.50%, and the remainder is Fe and impurities. The ratio of the Vickers hardness (HvS) of the area 0.1D [D: diameter of steel wire] from the surface of the steel wire (the surface layer) and the Vickers hardness (HvI) of the area interior to the surface layer satisfies [1.10 < HvS/HvI ≦ 1.15]. The average carbon concentration of the region from the surface of the steel wire up to 10μm deep (the outermost layer) is no more than 0.8 times the carbon concentration of the steel wire. The metal structure in the region interior to the aforementioned outermost layer region is, by area%, a pearlite structure: greater than or equal to 95%, and has a tensile strength of 2000-2400 MPa. This high-strength PC steel wire has a simple manufacturing method and has excellent delayed fracture resistance.
C21D 8/08 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires for concrete reinforcement
C22C 38/54 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
The chemical composition of this high-strength PC steel wire comprises, in mass%, C: 0.90-1.10%, Si: 0.80-1.50%, Mn: 0.30-0.70%, P: 0.030% or less, S: 0.030% or less, Al: 0.010-0.070%, N: 0.0010-0.010%, Cr: 0-0.50%, V: 0-0.10%, B: 0-0.005%, Ni: 0-1.0%, Cu: 0-0.50%, and the remainder is Fe and impurities. The ratio of the Vickers hardness (HvS) of the area 0.1D [D: diameter of steel wire] from the surface of the steel wire (the surface layer) and the Vickers hardness (HvI) of the area interior to the surface layer satisfies [1.10 < HvS/HvI ≦ 1.15]. The metal composition of the region from the surface of the steel wire up to 0.01D (the outermost layer) is, by area%, a pearlite structure: less than 80%, and the remainder is a ferrite structure and/or a bainite structure; the metal structure in the region interior to the aforementioned outermost layer region is, by area%, a pearlite structure: greater than or equal to 95%, and has a tensile strength of 2000-2400 MPa. This high-strength PC steel wire has a simple manufacturing method and has excellent delayed fracture resistance.
C22C 38/54 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
C21D 8/08 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires for concrete reinforcement
18.
CONCRETE REINFORCING MOLDED BODY, METHOD FOR MANUFACTURING SAME, PACKAGING STRUCTURE OF CONCRETE REINFORCING MOLDED BODY, AND METHOD FOR KNEADING FIBER REINFORCED CONCRETE
Provided is a plate-like concrete reinforcing molded body which comprises a concrete reinforcing fiber. The concrete reinforcing fiber preferably has a diameter of 0.3 mm or less and a length of 5 to 25 mm.
C04B 20/00 - Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
B28C 7/06 - Supplying the solid ingredients, e.g. by means of endless conveyors or jigging conveyors
E04C 5/02 - Reinforcing elements of metal, e.g. with non-structural coatings of low bending resistance, i.e. of essentially one-or two-dimensional extent
E04C 5/07 - Reinforcing elements of material other than metal, e.g. of glass, of plastics, or not exclusively made of metal
A covered PC steel twisted wire (1a, 1b, 1c, 1d, 1e, 1f, 1g, 1h) which is provided with: a twisted wire (2) that is obtained by twisting a plurality of steel strands (21); an anti-corrosion covering (3) that has an outer peripheral portion (31) which covers the outer periphery of the twisted wire (2); an outside covering (6) that covers the outer periphery of the anti-corrosion covering (3); and an optical fiber (4) that is arranged at a position corresponding to a twist groove (22) of the twisted wire (2) inside the outer peripheral surface of the outside covering (6) in such a manner that the optical fiber (4) follows expansion and contraction of the twisted wire (2).
Pregrouted PC steel (10) that has a 19-wire PC steel wire strand (1), a pregrouted layer (2) disposed on the outer circumference thereof, and a sheath (3) covering the outer circumference of the pregrouted layer (2), is filled with fill resin (4) between each steel wire (side wire) (1b, 1c, 1d). Because the fill resin (4) does not exude to the pregrouted layer (2) side before tensioning of the PC steel wire strand (1), the tensioning work of the PC steel wire strand (1) is not impeded due to the hardening of the pregrouted layer (2). Meanwhile, because the gaps between the steel wires are reduced when the PC steel wire strand (1) is under tension, due to the reduction, for the first time the fill resin (4) flows out (exudes) from between the steel wires into the pregrouted layer (2) and then hardens the same.
E04G 21/12 - Mounting of reinforcing inserts; Prestressing
B28B 23/04 - Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material wherein the elements are reinforcing members the elements being stressed
E04C 5/08 - Members specially adapted to be used in prestressed constructions
21.
ELECTRODE WIRE FOR WIRE ELECTRIC DISCHARGE MACHINING, AND METHOD FOR PRODUCING SAME
The purpose of the present invention is: to balance conductivity and discharge properties and to improve machining speed in an electrode wire for wire electric discharge machining which is obtained by plating a steel wire with a copper-zinc alloy; and to suppress detachment and cracking of the plating when drawing the electrode wire. The electrode wire for wire electric discharge machining is configured so as to comprise a steel wire (11) serving as a core wire, and a plating layer (12) for covering the steel wire and comprising a copper-zinc alloy, wherein the average zinc concentration in the plating layer is 60-75 mass%, the conductivity is 10-20% IACS, and the wire diameter is 30-200μm.
Provided is a pregrouted PC steel material which comprises a twisted PC steel wire composed of a plurality of steel wires, a pregrout layer disposed on the periphery of the twisted PC steel wire so as to embed the twisted PC steel wire, a sheath that covers the periphery of the pregrout layer, and capsules that have been interposed among the steel wires constituting the twisted PC steel wire and that each comprise a pregrout-hardening agent and a film with which the agent is covered, wherein the capsules have such a strength that the capsules do not break before tension of the twisted PC steel wire but are broken by the tensile force during the tension. Also provided is a method for hardening the pregrout layer.
A copper alloy which combines high strength and high conductivity and a copper alloy wire are provided. This copper alloy comprises 50 to 95mass% of Cu and 5 to 50mass% of Fe, the balance being deoxidizing elements and unavoidable impurities. The copper alloy has a texture which, when a section of the copper alloy is subjected to X-ray diffraction, exhibits large diffraction peaks assignable to the <111> planes of Cu and the <110> planes of Fe. The Icu(111) of the texture is 0.70 to 1.0 and the IFe(110) thereof is 0.90 to 1.0, wherein Icu(111) refers to a ratio of the diffraction peak intensity assignable to the <111> planes of Cu to the total diffraction intensity of Cu, while IFe(110) refers to a ratio of the diffraction peak intensity assignable to the <110> planes of Fe to the total diffraction intensity of Fe. The copper alloy has a grain orientation which is controlled so as to form a specific texture described above, thus combining high strength and a high conductivity of 50%IACS or higher.
C22F 1/08 - Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of copper or alloys based thereon
H01B 1/02 - Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of metals or alloys
H01B 5/02 - Single bars, rods, wires or strips; Bus-bars
C22F 1/00 - Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
24.
METAL WIRE FOR RUBBER REINFORCEMENT, MANUFACTURING METHOD FOR SAME, AND TYRE
One purpose of the present invention is to provide a metal wire for rubber reinforcement that exhibits excellent wire drawability and adhesion with rubber compositions. The aforementioned issue is resolved by a metal wire for rubber reinforcement characterized by having a metal core wire, and a coating layer that covers the metal core wire and comprises Cu, Zn and Co, and by the composition of the surface layer of the coating layer from the surface to a depth of 15nm inwards in the radial direction being 60at% to less than 69at% of Cu and 0.5at%-5.0at% of Co.
B32B 15/02 - Layered products essentially comprising metal in a form other than a sheet, e.g. wire, particles
B32B 15/06 - Layered products essentially comprising metal comprising metal as the main or only constituent of a layer, next to another layer of a specific substance of rubber
B60C 9/00 - Reinforcements or ply arrangement of pneumatic tyres
C25D 5/26 - Electroplating of metal surfaces to which a coating cannot readily be applied of iron or steel surfaces
C25D 5/50 - After-treatment of electroplated surfaces by heat-treatment
Provided is a device for measuring tension with high sensitivity and reproducibility even for an object material having a stranded wire structure. A long magnetic body (A), i.e., a measurement object material, is subjected to DC magnetization in the longitudinal direction up to the range of asymptotic saturation magnetization by means of a tubular magnetization unit (2) arranged to surround a part of the magnetic body (A), spatial field strength near the surface of the magnetic body (A) exhibiting a significant variation for stress variation is detected by means of a Hall element (magnetic sensor)(4) arranged near the central part in the longitudinal direction of a magnetization section of the magnetic body (A), and a tension acting on the magnetic body (A) is measured based on the detection value. With such an arrangement, measurement results can be obtained with high sensitivity and reproducibility and the device is also applicable to an object material having a stranded wire structure.
G01L 5/10 - Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands using electrical means
26.
ANNULAR CONCENTRICALLY-TWISTED BEAD CORD, AND VEHICULAR TIRE USING THE BEAD CORD
Provided are an annular concentrically-twisted bead cord, which is reduced in weight while retaining satisfactory manufacturing and handling properties, and a vehicular tire employing the bead cord. The annular concentrically-twisted bead cord (2) has a sheath layer (13) formed by winding side wires (12) helically around a metallic annular core (11). The side wires (12) are constituted by wrapping a pair of steel wires (22) around a side wire body (21) made of aramid fibers.
A pregrouted PC prestressing steel having multiple PC prestressing steel strands, a resin composition layer provided so as to enclose the PC prestressing steel strands and a sheath covering the periphery of the resin composition layer, characterized in that the resin composition layer consists of a thermoplastic resin composition. The pregrouted PC prestressing steel is limitless in the storable period and renders any precise process control unnecessary. Further, there is disclosed a method of PC working characterized by including the steps of (1) embedding the pregrouted PC prestressing steel in concrete, (2) after concrete curing, heating the resin composition to thereby soften the same, (3) stressing the PC prestressing steel strands after the step (2); and (4) allowing the resin composition layer after the step (3) to cool to thereby harden the same.
A powder coating composition for PC strand coating which, when used for the coating of a PC strand, can advantageously form a coating film having an even thickness at low cost without causing thickness unevenness or stringing. The powder coating composition for PC strand coating is characterized by having a melt viscosity of 3,000-15,000 P.
B05D 7/20 - Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to wires
B05D 7/24 - Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
A pregrouted PC steel having multiple PC steel wires, a resin composition layer provided so as to accommodate the PC steel wires and a sheath covering the periphery of the resin composition layer. The pregrouted PC steel is characterized in that it has means for heating the resin composition layer, and that the resin composition layer satisfies the requirements that when the viscosity after storage at 25°C for 30 days is referred to as &eegr; 30D and the viscosity before storage as &eegr; 0D, the value of log(&eegr; 30D)/log(&eegr; 0D) be 1.10 or less and that upon heating at 150°C for 4 hr, it harden within 6 months. Further, there is disclosed a method of PC post-tension construction using the pregrouted PC steel.
A strand which can reduce the construction cost by reducing the labor required for constructing an object to which a compression force is imparted by the strand. The strand (1) is arranged in a construction hole formed in the construction surface and grasped by a wedge under stretched state to impart a tensile force to the construction surface. The strand (1) has a metallic pipelike member (corrugated pipe (11)), and a plurality of metallic wires (12) arranged on the outer circumference of the corrugated pipe (11), wherein the plurality of metallic wires (12) are arranged to surround the corrugated pipe (11) at the cross-section of the corrugated pipe (11).
A connection method and a connection device of a metal linear element capable of firmly connecting metal linear elements easily and inexpensively. A connection method for connecting opposing metal linear elements (1) to each other in which a pair of second spur gears (41a, 41b) each having an insertion hole and a slit capable of holding a metal linear element (1) and formed at an interval are disposed at an interval, the insertion holes and the slits of these second spur gears (41a, 41b) are allowed to hold portions in the vicinities of the end portions (1a) of respective metal linear elements (1) that are stretched with the portions in the vicinities of end portions (1a) of the metal linear elements (1) kept overlapped in the axial direction, and the second spur gears (41a, 41b) are relatively rotated in opposite directions with the portions between the insertion holes and the slits as the centers of rotation, whereby the metal linear elements (1) are twisted and connected together between these second spur gears (41a, 41b) with a spacer (45) restricting the movement to the radial outside.
B21F 15/04 - Connecting wire to wire or other metallic material or objects; Connecting parts by means of wire wire with wire without additional connecting elements or material, e.g. by twisting
32.
ANNULAR METAL CORD, ENDLESS METAL BELT, AND METHOD OF PRODUCING ANNULAR METAL CORD
Provided are an annular metal cord having high breaking strength and capable of being easily produced, an endless metal belt, and a method of producing an annular metal cord. The annular metal cord (C1) is formed by annular core section (3) and an outer layer section (4) multiply helically wrapped around the annular core section (3) and covering the outer periphery of the annular core section (3). The annular core section (3) is formed in an annular shape by first and second strand members (1, 2) formed by twisting multiple metal wires (5, 6) together. An adhesion material for coating is applied and solidified around the annular metal cord(C1) to cover its periphery by an outer layer coating (10) formed from the elastic coating material.
It is possible to provide an annular metal cord an endless metal belt which have an excellent rupture strength and which can be easily manufactured, and a method for manufacturing the annular metal cord. The annular metal cord (C1) is prepared as follows. Six metal wires (5) are twisted into a strand (1), which is wound with a predetermined annular diameter. The start point and the end point of the strand is temporarily fixed to form an annular core (3). The strand (1) continuous from the annular core (3) is helically wound on the annular core (3) six laps so as to form an external layer (4) covering the external surface of the annular core (3). After this, the start point and the end point of the strand (1) are bonded by a connection member (7).
A nickel-plated stainless-steel wire which has satisfactory lubricity on tools and excellent processability. The nickel-plated stainless-steel wire is one produced by plating a raw stainless-steel wire with nickel and drawing the plated wire to thereby form recesses in the surface of the nickel deposit layer, and has a constitution in which an inorganic salt functioning to hold a lubricant is accumulated in the recesses. Even when that almost flat part of the plated wire which is the surface other than the recesses of the nickel deposit layer has almost no inorganic salt adherent thereto, the plated wire shows satisfactory lubricity on tools in drawing or coiling because of the lubricant-holding function of the inorganic salt accumulated in the recesses. Thus, the plated stainless-steel wire has improved processability.
B21C 1/00 - Manufacture of metal sheets, wire, rods, tubes or like semi-manufactured products by drawing
B21C 9/00 - Cooling, heating or lubricating drawing material
C23C 28/00 - Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of main groups , or by combinations of methods provided for in subclasses and
C25D 5/26 - Electroplating of metal surfaces to which a coating cannot readily be applied of iron or steel surfaces
In producing a wire for bead cords, a steel wire is first descaled. Subsequently, the steel wire descaled is subjected to a chemical conversion coating treatment by electrolysis to form a phosphate coating film on the steel wire. This steel wire, which has undergone chemical conversion treatment, is subjected to dry drawing and then to wet drawing as finish drawing to obtain a wire for bead cords. The drawing operations are conducted so that the zinc phosphate coating film, which has corrosion resistance, remains on the surface of the wire for bead cords.
A bead cord (9) has an annular core (10) and a single line of side wire (11) spirally wound for multiple times in one layer around the annular core (10). The annular core (10) is formed by a twisted wire (13) formed by two core wires (12) twisted together. The core wires (12) have the same diameter. Both end surfaces of the core wire (12) forming the annular core (10) are joined by welding. The direction of winding of the side wire (11) relative to the annular core (10) is preferably opposite the direction of twisting of the core wires (12).
A high-strength stainless steel spring that exhibits good workability, having high load characteristics. There is provided a high-strength stainless steel spring characterized in that the component formulation thereof consists of 0.04 to 0.08 mass% C, 0.15 to 0.22 mass% N, 0.3 to 2.0 mass% Si, 0.5 to 3.0 mass% Mn, 16 to 20 mass% Cr, 8.0 to 10.5 mass% Ni, 0.5 to 3.0 mass% Mo and the balance Fe and unavoidable impurities, and that when D refers to the coil average diameter of the spring and, in the event of stainless steel wire with a cross section of perfect circle, d refers to the diameter of the steel wire, while, in the event of stainless steel wire with a cross section of configuration other than the perfect circle, d’ refers to the value of coil outside diameter minus coil average diameter, the spring index expressed by D/d or D/d’ is in the range of 2 to 6.
A PC steel stranded wire that has a strength greater than in the prior art, being suitable for practical application; and a concrete structure utilizing the same. The high-strength PC steel stranded wire that has a strength greater than in the prior art, being suitable for practical application, can be manufactured by fabricating of a 7-wire stranded structure through stranding of one center wire together with six side wires and by regulating thereof so as to realize an outside diameter of 15.0 to 16.1 mm, a total cross section area of 135 mm2 or more and a load at 0.2% permanent elongation, or load at 0.1% permanent elongation, of 266 kN or greater.
D07B 1/06 - Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core
E04B 1/22 - Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of concrete, e.g. reinforced concrete, or other stone-like material with parts being prestressed
39.
METALLIC CORD, RUBBER/CORD COMPOSITE OBJECT, AND PNEUMATIC TIRE OBTAINED USING THE SAME
A rubber/cord composite object (9) which comprises: metallic cords (10) comprising plated wires (17E) obtained by forming a brass deposit layer (16) on the surface of uncoated wires (15) and drawing the plated wires; and a rubber (12) bonded to the metallic cords (10) through vulcanization. It has, between the rubber (12) and the brass deposit layer (16), an adhesive reaction layer (25) formed by the crosslinking reaction of sulfur with the copper. When the composite object is held in an atmosphere having a temperature of 50-100°C and a humidity of 60-100% for 1 hour to 20 days to bring the adhesive reaction layer (25) into the state of being deteriorated by moisture and heat, then the adhesive reaction layer (25) has an average thickness of 50-1,000 nm and the interface (S) of the adhesive reaction layer (25) has a fractal dimension in the range of 1.001-1.300.
Disclosed is a steel wire for spring which is obtained by drawing a steel wire which is coated with a phosphate at a coating amount of 3.0-5.5 g/m2. When the surface roughness of the steel wire for spring is represented by R and the wire diameter is represented by d, the value of R/d is within the range from 1.06 × 10-3 to 3.92 × 10-3.
A rubber/cord composite object (9) which comprises: metallic cords (10) comprising plated wires (17E) obtained by forming a brass deposit layer (16) on the surface of uncoated wires (15) and drawing the plated wires; and a rubber (12) bonded to the metallic cords (10) through vulcanization. When the composite object is held in an atmosphere having a temperature of 50-100°C and a humidity of 60-100% for 1 hour to 20 days to bring the brass deposit layer into the state of being deteriorated by moisture and heat, then the deposit crystal grains present in the brass deposit layer (16) have an average grain diameter of 50 nm or smaller and a grain-boundary fractal dimension in the range of 1.001-1.500.
An easy-to-produce annular metal cord exhibiting excellent break strength and an endless metal belt are provided. The annular metal cord has an annular core portion (3) and an outer layer portion (4). The annular core portion (3) is formed by bonding the opposite ends of a first strand material (1) consisting of six stranded first metal wires (5). The outer layer portion (4) is formed by winding a second strand material (2) consisting of six stranded second metal wires (6) six turns spirally around the annular core portion (3). The second strand material (2) is wound at a predetermined winding angle with respect to the central axis of the annular core portion (3), wherein the start-of-winding portion and the end-of-winding portion are coupled. Since six second strand materials (2) are not wound but the second strand material (2) are wound six turns, only one second strand material is required and the second strand material is coupled at only one position. Consequently, break strength of the annular metal cord can be enhanced while production is facilitated.
An oil-tempered wire which, after nitriding, combines high fatigue strength with toughness; and a spring made from the oil-tempered wire. The oil-tempered wire is one having a tempered martensite structure. When this oil-tempered wire is nitrided, a nitride layer having a lattice constant of 2.870-2.890 Å is formed in a surface part of the wire. This oil-tempered wire is obtained by subjecting a steel wire obtained by wire drawing to a quenching step and a tempering step. The quenching step is conducted after heating the wire at 850-950°C in terms of atmosphere temperature for 30-150 sec, excluding 30 sec, while the tempering step is conducted at 400-600°C.
Connection is facilitated by preventing shift, lowering of strength, and deterioration in balance of the connection member of a lateral-line wire. A columnar metallic material is pressed inward from the opposite sides using a pointed punch to form recessed sleeves (12) for receiving the start-of-winding (51) and the end-of-winding (51) of a lateral-line wire (50) on the respective sides, and a connection member (10) is formed with a partition wall-like thick portion (11) left at the central portion thereof. The connection member (10) is arranged such that the axial length (l) of the central thick portion (11) and the wire diameter (d) of the lateral-line wire satisfy the following relationship; d≤l≤8×d. The lateral-line wire (50) is cut with a predetermined margin so that the start-of-winding (51) and the end-of-winding (51) of the lateral-line wire (50) abut against the thick portion (11) at the rear ends of the sleeves (12) on the opposite sides.
An annular concentric stranded bead cord having an annular core, which cord is imparted with stable corrosion resistance over a long term at a low cost. The surface of a steel wire in an annular core (1) is applied with a corrosion-resistant paint and covered with a thick coating film (3) so that the surface of the steel wire is not exposed easily even if fretting takes place between the annular core (1) and a side wire (2), thereby ensuring stable corrosion resistance of the annular core (1) over a long term at a low cost.
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