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| Number | Title | Issue Date |
| 7438770 | High strength spring steel having excellent hydrogen embrittlement resistance The present invention provides a high strength steel used for spring steel that has excellent hydrogen embrittlement resistance. The high strength steel which spring steel having excellent hydrogen embrittlement resistance comprises 0.20 to 0.60% of C, 1.0 to... | 10/21/2008 |
| 7429301 | Ultra clean spring steel Disclosed herein is an ultra clean spring steel which contains inclusions easily elongated and broken into fine particles by hot rolling and which is easily adaptive to cold rolling and yields springs excelling in fatigue characteristics. The spring steel is charact... | 09/30/2008 |
| 7396422 | Rolling bearing, material for rolling bearing, and equipment having rotating part using the rolling bearing The invention relates to a rolling bearing which provides superior noiselessness and high corrosion resistance and longer life, and is manufactured at a low cost, a material for the rolling bearing, and an instrument including a rotating portion using the rolling be... | 07/08/2008 |
| 7284308 | Method for manufacturing a leaf spring Leaf springs have improved durability in spite of using inexpensive spring steel such as SUP9 and SUP11 as materials. While a spring main body, made of the spring steel in which Brinell hardness is under 555 HBW and not less than 388 HBW (corresponding to a diameter... | 10/23/2007 |
| 6939418 | Process for the thermomechanical treatment of steel A process for thermomechanical treatment of steel for torsionally-strained spring elements, the initial material being heated with a heating rate of at least 50 K/s and austenitized, and then, being formed in at least one forming step with the formed product being q... | 09/06/2005 |
| 6893727 | Metal gasket and a material for its manufacture and a method for their manufacture This invention relates to a stainless steel gasket having markedly improved strength and fatigue properties due to precipitation strengthening. Its composition comprises C: at most 0.03%, Si: at most 1.0%, Mn: at most 2%, Cr: 16.0%-18.0%, Ni: 6.0%-8.0%, N: at most 0... | 05/17/2005 |
| 6648996 | Method and apparatus for producing a helical spring The present invention is directed to a method for producing a helical spring which comprises the steps of providing a plurality of parameters for defining a desired configuration of a target helical spring, setting at least bending positions and twisting ... | 11/18/2003 |
| 6627005 | High fatigue-strength steel wire and spring, and processes for producing these A steel wire of pearlite structure containing 0.8-1.0 mass % of C and 0.8-1.5 mass % of Si is disclosed. In the cross section of the steel wire the average hardness in a region up to 100 μm from the surface thereof is at least 50 higher that that in a de... | 09/30/2003 |
| 6544360 | Highly strengthened spring and process for producing the same In a production process for highly strengthened springs, the process comprises performing a first shot peening to a spring steel having a hardness of a diameter of 2.7 mm or less on a Brinell ball mark while applying stress to the springs at a warm temper... | 04/08/2003 |
| 6478897 | Heat-resistant alloy wire An Ni-based or Ni--Co-based heat-resistant alloy wire excellent in resistance to sag at high temperatures ranging from 600 to 700° C., which excellent resistance is most suitable for spring materials. The heat-resistant alloy wire contains (a) 0.01 to 0.... | 11/12/2002 |
| 6436223 | Process and apparatus for improved module assembly using shape memory alloy springs A fixture and process for assembly of semiconductor modules. Each module comprises a substrate and a cover attached to the substrate. The fixture comprises a baseplate adapted to accept the substrate and a spring-loading device containing a shape memory a... | 08/20/2002 |
| 6406565 | High toughness spring steel 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 th... | 06/18/2002 |
| 6371464 | Valve spring A method of making a spring are described. The spring is made by etching or cutting at least one spiral arm in a flat substrate leaving residual material around the arm. The intermediate residual material is either pushed or lifted to form a conical sprin... | 04/16/2002 |
| 6346157 | Manufacturing method of suspension spring for car A method for manufacturing a coiled spring having a high fatigue strength to be used for example as a suspension spring of a car using a rod of tensile strength 1910 to 2020 N/mm2 and diameter 8 to 17 mm. In a cold coiling step, the rod is form... | 02/12/2002 |
| 6338763 | Steel wire for high-strength springs and method of producing the same 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, ... | 01/15/2002 |
| 6328820 | Spring steel superior in fatigue properties A spring steel containing SiO2, Al2 O3, CaO, and MgO as oxide type inclusions, which have an average composition (by weight) of 35%ࣘSiO2ࣘ75%, 5%ࣘAl2 O3ࣘ30%, 10%ࣘCaOࣘ50%, and MgO... | 12/11/2001 |
| 6284065 | Bearing steel An improved bearing steel, adapted for the manufacturing of thick-walled bearing rings, containing, in weight-%: C 1.00-1.10 Si 0.15 max Mn 1.35-1.65 ... | 09/04/2001 |
| 6235131 | System for heat treating coiled springs Steel springs are cold coiled, then hardened by electrical resistance heating, and then quenched. The invention may be used to produce hardened springs with uniform mechanical and physical characteristics, fine grain microstructures, and high fatigue resi... | 05/22/2001 |
| 6224686 | High-strength valve spring and it's manufacturing method The high-strength valve spring uses, as the material, a steel containing 0.5-0.8% C, 1.2-2.5 wt % Si, 0.4-0.8 wt % Mn, 0.7-1.0 wt % Cr, balance Fe and inevitable impurities, where, in the inevitable impurities, Al is no more than 0.005 wt % and Ti is no m... | 05/01/2001 |
| 6206984 | Non-heat treated wire or bar steel for springs A non-heat treated wire or bar steel for springs which is characterized by having in its as-rolled state a tensile strength of 120-150 kgf/mm2 and a bending breakage rate no higher than 15% when tested according to JIS Z-2248 under the conditio... | 03/27/2001 |
| 6132533 | Method for making arcuate coil springs, resulting springs and devices for carrying out the method The invention relates to a method for making arcuate coil springs from straight coil springs and particularly includes a phase of bending the straight springs during a heat treatment, which method provides exceptional results in that for the bending, a la... | 10/17/2000 |
| 6106639 | Stainless steel wire and process of manufacture Stainless steel wire of diameter smaller than 2 mm and with a tensile strength greater than 2100 MPa, consisting of a steel whose chemical composition includes, by weight: 0%ࣘCࣘ0.03%, 0%ࣘMnࣘ2%, 0%ࣘSiࣘ0.5%, 8%ࣘNiࣘ9%, 17%ࣘCrࣘ18%, 0%... | 08/22/2000 |
| 6074496 | High-strength oil-tempered steel wire with excellent spring fabrication property and method for producing the same A high-strength oil-tempered steel wire with excellent spring fabrication property that is made of spring low-alloy steel, having a decarburized layer of reduced hardness extending to a depth of not greater than 200 μm from the wire surface, a wire surfa... | 06/13/2000 |
| 6022427 | Method for producing helical springs A method of manufacturing helical springs from steel wire. The springs' skin is thermomechanically hardened by shot peening the unstressed springs followed by thermally destressing them, and shot peening them again. The second shot peening is carried out ... | 02/08/2000 |
| 6017641 | Coil spring resistive to delayed fracture and manufacturing method of the same A coil spring made of an oil-tempered steel wire with internal hardness of more than Hv 550 in cross-section, the surface hardness of the oil-tempered steel wire being determined in an extent between Hv 420 in a minimum value and hardness defined by subtr... | 01/25/2000 |
| 5930897 | Method and apparatus for tempering knotted coil springs Disclosed herein is apparatus for fabricating a coil spring including axially opposite end convolutions having respective ends respectively knotted to the associated end convolutions, which apparatus comprises a frame, a coil forming device mounted on the... | 08/03/1999 |
| 5897717 | High strength spring steel and process for producing same The present invention provides, at low cost, a valve spring steel having a tensile strength as high as 210 to 240 kgf/mm2 after oil tempering. The high strength spring steel comprises, based on weight, 0.65 to 0.85% of C, 1.90 to 2.40% of Si, 0... | 04/27/1999 |
| 5846344 | Spring steel of high strength and high corrosion resistance Disclosed is a spring steel for a high corrosion resistant and high strength, which exhibits an excellent drawability without softening heat treatment after hot rolling, and which has a strength of 1900 MPa or more by quenching and tempering and an excell... | 12/08/1998 |
| 5776267 | Spring steel with excellent resistance to hydrogen embrittlement and fatigue The present invention provides a spring steel with excellent performance, characterized in that the spring steel is produced by making a spring steel contain an appropriate amount of at least one or more of Ti, Nb, Zr, Ta, and Hf, thereby generating fine ... | 07/07/1998 |
| 5683521 | Method for manufacturing spring having high nitrided properties A method for forming a spring which can reduce variations in the surface hardness and the thickness of the hardened layer when the spring is nitrided. Before nitriding the spring, the thickness of an oxide film formed on the surface of the spring is reduc... | 11/04/1997 |
| 5665179 | Process for producing a coil spring A process for producing a coil spring comprises steps of: cold drawing a wire comprising: C in an amount of 0.55 to 0.75% by weight; Si in an amount of 1.00 to 2.50% by weight; at least two primary metals selected from the primary metal group consisting o... | 09/09/1997 |
| 5643532 | Corrosion-resistant spring steel A spring steel of medium strength and sufficient corrosion resistance prepared by simple procedures, and therefore, at a low cost, is provided. The spring steel has the alloy composition of: C 0.3-0.6%, Si 1.0-2.0%, Mn 0.1% to less than 0.5%, Cr 0.4-1.0%,... | 07/01/1997 |
| 5575973 | High strength high toughness spring steel, and manufacturing process therefor A low decarburization high toughness spring steel for an automobile suspending spring, and a manufacturing process therefor, are disclosed. In this steel, the effect of the sag resistance promoting element (Si) is maximized without reducing the carbon con... | 11/19/1996 |
| 5534088 | Method of optimizing the distribution of inherent stress in springs A method of optimizing the distribution of inherent stress in springs intended for vehicle suspensions, especially in the rod cross-section of high-strength helical compression springs, whereby the springs are set and bombarded with balls. The springs are... | 07/09/1996 |
| 5508002 | Spring steel of high strength and high corrosion resistance Disclosed is a spring steel for a high corrosion resistant and high strength, which exhibits an excellent drawability without softening heat treatment after hot rolling, and which has a strength of 1900 MPa or more by quenching and tempering and an excell... | 04/16/1996 |
| 5470528 | Low decarburization spring steel A low decarburization spring steel consisting essentially of, in weight percentages, 0.40 to 0.75% C, 0.15 to 2.50% Si, 0.30 to 1.20% Mn, 0.005 to 0.100% Al and 0.005 to 0.100% Se, and optionally at least one selected from the group consisting of 0.50 to ... | 11/28/1995 |
| 5429688 | Work hardened stainless steel for springs A metastable austenitic, cold deformed "work hardened stainless steel for springs", with 17.0 to 19.0% Cr, 8.0 to 10.0% Ni, up to 0.03% C, 0.006 to 0.16% N, up to 1.0% Si, 1.0 to 2.0% Mn, up to 0.8% Mo, up to 0.045% P, up to 0.030% S, iron (Fe) and residu... | 07/04/1995 |
| 5415711 | High-strength spring steels and method of producing the same A high-strength spring steel has a high fatigue limit and is characterized by restricting the number of oxide particle inclusion having a diameter of not less than 10 μm in steel to not more than 12 particles/100 mm2.... | 05/16/1995 |
| 5368656 | Steel spring and method for producing same A hot rolled steel bar is subjected to controlled hot roll finishing and cooling conditions which, together with the composition of the steel and controlled subsequent heat treating and quenching conditions, enable the formation of a steel spring having b... | 11/29/1994 |
| 5310521 | Steel composition for suspension springs A steel composition is provided having improved sag resistance and fatigue behavior properties adapting it to be suitable for coil and torsion bar suspension springs for passenger vehicles and light trucks of lesser weight. Critical to the composition is ... | 05/10/1994 |
