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WO/1984/002481 |
A method for increasing strength and/or hardness of a preshaped metal specimen (18) by cold working. Compressive force is applied to the specimen slowly so that the yield strength of the specimen progressively increases and the specimen ...
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WO/1984/001586 |
Armouring bars which are treated by hardening in a cooling liquid and thereafter by drawing temper owing to the core heat exhibit a mantel treated by hardening and drawing temper having an uneven thickness so that it is difficult to bend...
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WO/1983/002783 |
A method of continuously casting a molten ferrous alloy in a casting means (12) to obtain a solidified cast bar (20) at a hot-forming temperature, passing the cast bar (20) at a hot-forming temperature from the casting means (12) to a ho...
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JP2013036087 |
To provide a material for spring having high strength, such as ≥1,900 MPa tensile strength and high ductility, and a manufacturing method thereof.The material for spring is composed of an iron-based alloy containing prescibed component...
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JP2013036113 |
To provide a highly durable compression coil spring, which is produced using an inexpensive wire rod while imparting adequate residual stress to the wire rod, and to provide a method for producing the compression coil spring.The compress...
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JP2013006215 |
To enable to improve more the rise of a fatigue strength according to the hardness rise by plastic working.Disclosed is a treatment method for increasing the durability of steel structures, in which peening treatment is carried out on a ...
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JP2013007084 |
To provide a thin steel strip plate and an endless steel strip that have high strength and high fatigue strength by controlling surface layer hardness, pearlite texture and residual stress in addition to increasing the content of C to a ...
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JP2013007094 |
To provide a steel back plate of excellent corrosion resistance and adhesion, for use in a friction material.The steel product has a nitride compound layer and a nitrogen-diffused layer formed on the surface layer of a base material bein...
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JP2013002282 |
To provide a method for manufacturing a cylinder block of a hydraulic rotating machine that achieves a normal sliding state between a cylinder block and a sliding member and maintains a stable sliding state therebetween, and the hydrauli...
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JP2012247029 |
To suppress abrasion of a sliding bearing for supporting a crank journal part made of graphitic cast iron.A crankshaft is used as an output shaft of an internal combustion engine which is automatically stopped and automatically started, ...
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JP2012223818 |
To control any loss of the compressive residual stress introduced in a weld toe by the peening treatment while using a structure having a weld joint of a steel member.Impact dents 202a, 202b having the radius R of curvature of ≥1.0 mm ...
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JP2012214859 |
To provide a spring that has a high compression residual stress layer having improved fatigue resistance and that has increased simplicity of the production process and reduced materials cost, and to provide a method for producing the sp...
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JP2012201975 |
To provide an austenitic stainless steel pipe excellent in water vapor oxidation resistance by determining quality of shot processing based on measurement of surface roughness on the inner surface of the pipe.In the austenitic stainless ...
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JP2012200840 |
To provide a heat conducting member in which a residual tensile stress in a metal tube is reduced when a tubular ceramic body is covered with the metal tube.This heat conducting member 10 includes a tubular ceramic body 11 having a fluid...
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JP2012193394 |
To provide a high face-pressure component which makes soft-solid lubrication powder efficiently adhere to a soft metal membrane having slide performance by performing shot peening by using mixed powder after a steel ball and a soft metal...
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JP2012184463 |
To provide a spring which achieves a reduction in the material cost and simplification of the manufacturing process, and is excellent in fatigue endurance, and to provide a method for manufacturing the spring.The spring is characterized ...
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JP2012179656 |
To provide a method for making a clad material with a substrate having strength larger than that of a cladding material.The method includes a step for preparing an assembly 10 by welding a clad material and a substrate 12 where an edge o...
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JP2012176437 |
To provide a fatigue strength improving method for improving fatigue strength of a weld part of a steel structure like a steel bridge suitable for hammer peening by introducing a compressive residual stress without imparting any deformat...
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JP2012167328 |
To provide a welded steel pipe which can be manufactured with high productivity and is excellent in collapse strength with excellent toughness, without reducing allowable degree of pipe making and coating conditions by using a steel pipe...
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JP2012153977 |
To provide a laser peening treatment method for improving fatigue property more than the conventional methods in an environment where repeated loads act on a weld toe portion of a weld structure and a plastic deformation region of a form...
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JP2012144752 |
To provide a spring having excellent corrosion fatigue strength, though having high strength.The spring has Rockwell hardness of HRC 53 to HRC 56, and when the Rockwell hardness of the spring is defined as H, in the range of the Rockwell...
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JP2012135864 |
To improve the surface roughness of a metal product, surely form uniform nano-scale microstructures on a surface layer, and form a surface layer robust enough not to disappear due to wear on the surface layer.Instantaneous rapid heating ...
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JP2012132097 |
To provide: a spring which can secure high rigidity, high toughness and a high strength ratio even if tempering treatment after quenching is eliminated; a spring steel wire used for the spring; and spring steel.This spring steel contains...
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JP2012117095 |
To provide a method for improving fatigue strength that can improve the fatigue strength of cast iron material, specifically spherical graphite cast iron, to the same level as that of carbon steel subjected to carburizing and quenching.T...
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JP2012117091 |
To provide a steel wire for a high strength spring by which breakage is suppressed during coiling and from which a high strength spring having excellent durability and settling resistance is obtained after coiling.The steel wire for the ...
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JP2012115881 |
To provide a method for improving fatigue strength capable of improving the fatigue strength of a cast iron material, specifically spherical graphite cast iron to the same level as that of carbon steel subjected to carburizing and quench...
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JP2012115925 |
To provide a method for improving a fatigue strength which can improve the fatigue strength of a cast iron material, particularly spheroidal graphite cast iron, to the same degree as carburized and quenched carbon steel.The method includ...
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JP2012117119 |
To provide a method of ultrasonic impact processing for a coil spring, reducing processing time while uniformly applying compressive residual stress on an inner circumferential surface of a coil spring and capable of achieving improvemen...
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JP2012117092 |
To provide a high strength spring which has high settling resistance and durability and is used in a power train of an automobile.The high strength spring contains 0.50-0.70 mass% of C, 1.80-2.20 mass% of Si, 0.50-0.80 mass% of Mn, 0.50-...
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JP2012111992 |
To provide a spring that has excellent fatigue resistance, reduces material costs and simplifies manufacturing processes.A method for manufacturing the spring includes: a shaping step of shaping a wire rod having components consisting of...
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JP2012110978 |
To provide both high hardness and crystal grain refinement, in shot peening which is a simple and inexpensive surface treatment.The apparatus includes: an induction heating coil 130 for heating a workpiece W; a high-frequency applying de...
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JP2012102378 |
To provide an inexpensive steel for a high strength spring excellent in corrosion resistance and pitting corrosion resistance and having a low amount of alloy elements added, to provide a method for producing the high strength spring, an...
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JP2012087356 |
To provide autofrettage processing capable of reducing, as much as possible, wear and tear of a part caused by abrasion.The autofrettage processing device applies the autofrettage processing to a workpiece, in which before pressurization...
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JP2012077382 |
To provide a ferritic stainless steel welded pipe excellent in expanding workability free from a crack in pipe expansion working occurring at a welding part or near the welding part in the pipe expansion working of two times or more of a...
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JP2012072497 |
To provide a hot-rolled steel sheet for chemical conversion treatment inexpensively, and to provide a method for manufacturing the same.The hot-rolled steel sheet for chemical conversion treatment includes, by mass, 0.01-0.10% C, 0.01-2....
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JP2012055969 |
To provide autofrettage processing that can reduce attrition in a part, which is caused by wear, as much as possible.The autofrettage apparatus inserts a piston (42) into an inner pressure chamber (IC) at a predetermined supply speed (v)...
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JP2012045695 |
To solve the problem of easily causing hydrogen embrittlement when tensile residual stress exists, since intrusion of hydrogen depends on a metallic structure and a stress state of a metallic surface, due to causing the hydrogen embrittl...
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JP2012036429 |
To provide a spring having excellent fatigue resistance and a manufacture method therefor to reduce material costs and simplify the manufacturing process.The spring has components including, by mass%, 0.5-0.7 of C, 1.0-2.0 of Si, 0.1-1.0...
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JP2012036418 |
To provide a technique for providing a spring having a higher strength than that in the prior art.A high-strength spring 2 includes a steel layer 12 and a nitride-containing compound layer 14 that is formed on the surface of the steel la...
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JP2012031445 |
To provide a spiral steel having high mechanical strength, capable of easily narrowing pitch intervals of a twisted portion (spiral blade portion) even without changing a twist angle, and to provide an application product of the spiral s...
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JP2012017499 |
To provide a gear with high surface pressure fatigue resistance which is required for an automobile, a variety of industrial equipment and the like, and a method of manufacturing the same.The gear is manufactured by shaping steel having ...
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JP2012001802 |
To provide steel having a tensile strength of 2.0 GPa or higher, and superior toughness and ductility, and a method for manufacturing the same.The steel includes, by mass, 0.33-0.40% C, 2.0-5.0% Ni, 0.01% or more and less than 0.5% Mn, 0...
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JP2011252205 |
To perform material control by suppressing the diffusing speed of carbon in a ferrite steel material by using an AC magnet field.In the control method of the ferrite steel material containing an intrusion-type solid solution element, the...
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JP2011247276 |
To provide a method for manufacturing a coil spring which is capable of improving the fatigue strength.A spring element wire is subjected to a warm shot-peening step S4, a water-cooling step S5, and a cold shot-peening step S7. In the wa...
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JP2011245545 |
To provide a welded joint which is suitable for a steel structure such as a steel bridge which requires excellent fatigue characteristics, capable of introducing compression residual stress without deformation of a welding part which can...
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JP2011241478 |
To provide a system that monitors the effectiveness of laser shock peening in a real-time basis, and a method.The system 10 for laser shock peening includes: a laser 12 positioned to direct a laser pulse 20 at a first surface 22 of a wor...
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JP2011236496 |
To provide steel having excellent adhesiveness of a coated film, which is excellent in the adhesiveness of the coated film when forming the coated film on the surface of the steel, and in which peeling of the coated film from the end par...
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JP2011225918 |
To provide a steel material which is suitable for marine structures, the material showing good local corrosion resistance even if it has a high Cr content compared with a usual one and being excellent in sea-water corrosion resistance.Th...
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JP2011219851 |
To provide a spring with a remarkably raised fatigue strength by making thicknesses of a nitrogen compound layer and a carbon compound layer on the surface layer thin as much as possible and forming thickly a high compression residual st...
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JP2011214019 |
To provide a method for producing a functionally gradient material utilizing a phase transformation by working.To the surface of a material generating the phase transformation with introduction of strain, the working is performed and the...
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