EP0906453A1 - Relaxation-resistant steel spring - Google Patents

Relaxation-resistant steel spring

Info

Publication number
EP0906453A1
EP0906453A1 EP96919601A EP96919601A EP0906453A1 EP 0906453 A1 EP0906453 A1 EP 0906453A1 EP 96919601 A EP96919601 A EP 96919601A EP 96919601 A EP96919601 A EP 96919601A EP 0906453 A1 EP0906453 A1 EP 0906453A1
Authority
EP
European Patent Office
Prior art keywords
relaxation
percent
weight
resistant steel
steel spring
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP96919601A
Other languages
German (de)
French (fr)
Other versions
EP0906453B1 (en
Inventor
Joachim Heinke
Klaus Wanke
Otto Zehendner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Datec Scherdel Datentechnik Forschungs und Entwicklungs GmbH
Original Assignee
Datec Scherdel Datentechnik Forschungs und Entwicklungs GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Datec Scherdel Datentechnik Forschungs und Entwicklungs GmbH filed Critical Datec Scherdel Datentechnik Forschungs und Entwicklungs GmbH
Publication of EP0906453A1 publication Critical patent/EP0906453A1/en
Application granted granted Critical
Publication of EP0906453B1 publication Critical patent/EP0906453B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/02—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for springs
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires

Definitions

  • the invention relates to a steel spring which has a good resistance to relaxation at relatively high working temperatures.
  • Feathers made from patented drawn spring steel wires consisting of unalloyed carbon steels are known. Such springs are essentially free of scale and residual dirt particles, but can only be used to a limited extent for operating temperatures of over 80 ° C. They are used with greatly reduced working voltages, the compensation of which can only take place via a higher insert mass of the spring, which is known to bring considerable disadvantages for economic as well as for design reasons. With regard to the relaxation behavior at higher operating temperatures, springs made from oil-quenched, unalloyed spring steel and valve spring wires have the same disadvantages.
  • the surface is contaminated with scale or remnants of other residues as a result of the oil finish, the spring function can loosen and, in sensitive work areas such as automatic transmissions and fuel injection systems in motor vehicles, can lead to considerable malfunctions or to the complete failure of such units.
  • the object of the invention is to create a high-strength wire spring which is resistant to relaxation at elevated operating temperatures and has a surface free of scale or residual dirt and relatively low material costs.
  • the object is achieved in that the reiaxation-resistant steel spring with high strength comprises the following features.
  • a steel wire with the composition 0.45 - 0, $ 5 weight percent carbon, 0.2 - 1, 60 weight percent silicon, 0.3 - 1.50 weight percent manganese, 0.4 - 1, 20 weight percent chromium and the rest iron and inevitable Additives are austenitized and then isothermally heat-treated in the temperature range between 450 and 650 ° C, then pulled to a tensile strength of 1600 - 2300 N / mm 2 with a constriction of at least 40%.
  • This wire is cold-formed into a spring, which is subsequently annealed in the temperature range of 200-350 ° C. with low stress.
  • the steel has vanadium additions of 0.05-0.30 percent by weight, that the steel contains other additions such as 0.005-0.05 percent by weight titanium, 0.01-0.2 percent by weight niobium and / or tantalum as well 0.05-0.5% by weight of molybdenum and that the elements chromium and silicon are completely or partially replaced by 0.003-0.01% by weight of boron.
  • the spring has a helical shape and the mean spring diameter is equal to or less than four times the wire diameter to the purpose of increasing the durability takes place a shot blasting and is advanced by means of elastic deformation at either room temperature and / or at temperatures up to 400 C ⁇ .
  • Example 1 The invention is explained in more detail below using two exemplary embodiments, without being limited thereto.
  • Example 1 The invention is explained in more detail below using two exemplary embodiments, without being limited thereto.
  • Example 1
  • a relaxation-proof and heat-resistant tension spring with • the following dimensions:
  • L2 570 mm 85 is produced from a rolled steel with 8 mm 0 and the following composition:
  • This rolled steel is austenitized at 900 ° C., converted isothermally at 95 ° C. and then cold drawn to 3.6 mm. A strength Rm of 1900 N / mm 2 is achieved.
  • This wire is fully automatically formed into a tension spring The above-mentioned dimensions are reshaped and then stress relieved for one hour at 300 ° C. Loss of relaxation after testing for L2 at 145 ° C. 100 one hour: 4.8%
  • Another example relates to the manufacture of a helical compression spring. From a rolled steel 5.5 mm 0 with a composition as in Example 1, an analog heat and cold drawing treatment is carried out at the tension spring and a compression spring for a fuel injection pump with the following spring data is generated: Wire diameter 1, 4 mm outside diameter 7.3 mm

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Springs (AREA)
  • Heat Treatment Of Articles (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)

Abstract

The invention concerns a very strong steel spring having a bright surface which is free from residual dirt, the spring also being resistant to relaxation at high operating temperatures. A spring of this type is produced from a steel wire of the following composition: between 0.45 and 0.85 wt % carbon; between 0.2 and 1.60 wt % silicon; between 0.3 and 1.50 wt % manganese; between 0.4 and 1.2- wt % chromium; the remainder being iron and unavoidable impurities. The wire is austenitized and then treated isothermally at temperatures ranging from 450 to 650 DEG C. The wire is then drawn to a tensile strength of between 1600 and 2300 N/mm<2> at a contraction in area when breaking of at least 40 %. The wire is cold formed to produce a spring and is then stress-free annealed at temperatures ranging from 200 to 350 DEG C.

Description

Relaxationsfeste StahlfederRelaxation-resistant steel spring
Die Erfindung betrifft eine Stahlfeder, die bei relativ hohen Arbeitstempera¬ turen eine gute Relaxationsfestigkeit besitzt.The invention relates to a steel spring which has a good resistance to relaxation at relatively high working temperatures.
Bekannt sind Federn aus patentiert gezogenen Federstahldrähten bestehend aus unlegierten Kohlenstoffstählen. Solche Federn sind im wesentlichen frei von Zunder und Restschmutzteilchen, sind aber für Betriebstemperaturen von über 80 °C nur bedingt einsetzbar. Der Einsatz erfolgt mit stark reduzierten Arbeitsspannungen, deren Kompensation nur über eine höhere Einsatzmasse der Feder erfolgen kann, die bekanntlicher Weise aus wirtschaftlichen aber auch aus konstruktiven Gründen erhebliche Nachteile bringt. Hinsichtlich des Relaxationsverhaltens bei höheren Betriebstemperaturen zeigen Federn aus ölschlußvergüteten unlegierten Federstahl- und Ventilfederdrähten die gleichen Nachteile. Hinzu kommt, daß infolge der Ölschlußvergütung die Oberfläche mit Zunder oder Reste anderer Rückstände behaftet ist, sich bei der Federfunktion lösen und in sensiblen Arbeitsbereichen wie beispielsweise automatischen Getrieben und Kraftstoffeinspritzsystemen in Kraftfahrzeugen zu erheblichen Störungen oder zum gänzlichen Ausfall derartiger Aggregate führen können.Feathers made from patented drawn spring steel wires consisting of unalloyed carbon steels are known. Such springs are essentially free of scale and residual dirt particles, but can only be used to a limited extent for operating temperatures of over 80 ° C. They are used with greatly reduced working voltages, the compensation of which can only take place via a higher insert mass of the spring, which is known to bring considerable disadvantages for economic as well as for design reasons. With regard to the relaxation behavior at higher operating temperatures, springs made from oil-quenched, unalloyed spring steel and valve spring wires have the same disadvantages. In addition, the surface is contaminated with scale or remnants of other residues as a result of the oil finish, the spring function can loosen and, in sensitive work areas such as automatic transmissions and fuel injection systems in motor vehicles, can lead to considerable malfunctions or to the complete failure of such units.
Zur Erhöhung des Relaxationsverhaltens bei höheren Arbeitstemperaturen ist der Einsatz von Federn aus CrV-, SiCr- und SiCrV - legierten Federstahldräh¬ ten bereits praxisbekannt. Hiermit lassen sich Grenztemperaturen von 160 CC realisieren. Diese legierten Stähle erfordern ebenfalls eine Ölschlußvergü¬ tung. Es treten also die gleichen Nachteile wie bei Federn aus unlegierten Federstählen auf., d.h., ebenfalls hier haften an der Oberfläche Reste von Zunder, der gelöst, infolge der Federfunktion, zu Ausfällen hochempfindlicher technischer Systeme führen kann. Ein weiterer wesentlicher Nachteil besteht darin, daß das bei der Vergütung entstandene martensitische Gefüge außer¬ ordentlich empfindlich beim Beizen oder einer Oberflächenbehandlung rea¬ giert, die mit einer Wasserstoffdiffusion in den Federwerkstoff verbunden ist. Die sogenannte Wasserstoffversprödung, wie sie beim Beizen oder elektroly¬ tischen Beschichten entsteht, führt zum vorzeitigen Ausfall des Federelemen- tes und damit zur Funktionsmüdigkeit komplizierter und teurer Mechanismen. Neben diesen funktionellen Nachteilen haftet den Federn dieser Werkstoff¬ gruppe ein wesentlicher technologischer Nachteil an. Nach dem Umformen müssen derartige Federelemente ohne Zeitverzug einer Entspannungsglü- hung (Anlassen) unterzogen werden. Treten hier Verzögerungen ein, bilden sich Eigenspannungsanrisse, die zum vorzeitigen Bruch des oder der Feder¬ elemente führen. Zur Beseitigung dieser Nachteile sind Federn aus austenitischen nichtrosten¬ den Federdrähten, beispielsweise der Sorte X 12 CrNi 17.7, entwickelt wor¬ den. Infolge des wesentlich höheren Legierungsaufwandes und der technolo- gischen Besonderheiten entstehen unvertretbar hohe Materialkosten für die Federelemente.The use of springs made of CrV, SiCr and SiCrV alloy spring steel wires is already known in practice to increase the relaxation behavior at higher working temperatures. This enables limit temperatures of 160 C C to be achieved. These alloyed steels also require an oil seal. So there are the same disadvantages as with springs made of unalloyed spring steels, ie here too there are residues of scale on the surface which, when released, can lead to failures of highly sensitive technical systems due to the spring function. Another major disadvantage is that the martensitic structure that is produced during the tempering is extremely sensitive to pickling or a surface treatment that is associated with hydrogen diffusion in the spring material. The so-called hydrogen embrittlement, as occurs during pickling or electrolytic coating, leads to the premature failure of the spring element and thus to the functional fatigue of complicated and expensive mechanisms. In addition to these functional disadvantages, the springs of this material group have a significant technological disadvantage. After reshaping, spring elements of this type must be subjected to a relaxation annealing (tempering) without delay. If delays occur here, residual stress cracks form which lead to premature breakage of the spring element or elements. To eliminate these disadvantages, springs made of austenitic, non-rusting spring wires, for example of the grade X 12 CrNi 17.7, have been developed. As a result of the significantly higher alloying effort and the technological peculiarities, unacceptably high material costs arise for the spring elements.
Aufgabe der Erfindung ist es, eine hochfeste, bei erhöhten Betriebstempera¬ turen relaxationsbeständige Drahtfeder mit zunder- bzw. restschmutzfreier Oberfläche und relativ geringen Materialkosten zu schaffen.The object of the invention is to create a high-strength wire spring which is resistant to relaxation at elevated operating temperatures and has a surface free of scale or residual dirt and relatively low material costs.
Erfindungsgemäß wird die Aufgabe dadurch gelöst, daß die reiaxationsfeste Stahlfeder mit hoher Festigkeit folgende Merkmale umfaßt. Ein Stahldraht mit der Zusammensetzung 0,45 - 0,$5 Gewichtsprozente Kohlenstoff, 0,2 - 1 ,60 Gewichtsprozente Silizium, 0,3 - 1,50 Gewichtsprozente Mangan, 0,4 - 1 ,20 Gewichtsprozente Chrom und den Rest Eisen sowie unvermeidliche Bei- mengungenen wird austenitisiert und nachfolgend isothermisch im Tempera¬ turbereich zwischen 450 und 650 °C wärmebehandelt, wird anschließend gezogen auf eine Zugfestigkeit von 1600 - 2300 N/mm2 bei einer Bruchein- schnürung von mindest 40 %. Dieser Draht wird zu einer Feder kaltgeformt, die nachfolgend im Temperaturbereich von 200 - 350 °C spannungsarm ge¬ glüht wird. Weitere kennzeichnende Merkmale der Erfindung sind, daß der Stahl Vanadinbeimengungen von 0,05 - 0,30 Gewichtsprozente hat, daß der Stahl andere Beimengungen wie 0,005 - 0,05 Gewichtsprozente Titan, 0,01 - 0,2 Gewichtsprozente Niob und/oder Tantal sowie 0,05 - 0,5 Gewichts¬ prozente Molybdän besitzt und daß die Elemente Chrom und Silizium ganz oder teilweise durch 0,003 - 0,01 Gewichtsprozente Bor ersetzt werden Die Feder besitzt eine schraubenförmige Gestalt und der mittlere Federdurch¬ messer ist gleich oder kleiner dem Vierfachen des Drahtdurchmessers Zum Zwecke der Erhöhung der Dauerhaltbarkeit erfolgt ein Kugelstrahlen und wird durch überelastische Verformung entweder bei Raumtemperatur und/oder bei Temperaturen bis 400 βC vorgesetzt.According to the invention the object is achieved in that the reiaxation-resistant steel spring with high strength comprises the following features. A steel wire with the composition 0.45 - 0, $ 5 weight percent carbon, 0.2 - 1, 60 weight percent silicon, 0.3 - 1.50 weight percent manganese, 0.4 - 1, 20 weight percent chromium and the rest iron and inevitable Additives are austenitized and then isothermally heat-treated in the temperature range between 450 and 650 ° C, then pulled to a tensile strength of 1600 - 2300 N / mm 2 with a constriction of at least 40%. This wire is cold-formed into a spring, which is subsequently annealed in the temperature range of 200-350 ° C. with low stress. Further characteristic features of the invention are that the steel has vanadium additions of 0.05-0.30 percent by weight, that the steel contains other additions such as 0.005-0.05 percent by weight titanium, 0.01-0.2 percent by weight niobium and / or tantalum as well 0.05-0.5% by weight of molybdenum and that the elements chromium and silicon are completely or partially replaced by 0.003-0.01% by weight of boron. The spring has a helical shape and the mean spring diameter is equal to or less than four times the wire diameter to the purpose of increasing the durability takes place a shot blasting and is advanced by means of elastic deformation at either room temperature and / or at temperatures up to 400 C β.
Die Erfindung wird nachstehend an zwei Ausfύhrungsbeispielen naher erläutert, ohne sich darauf zu beschränken. Beispiel 1:The invention is explained in more detail below using two exemplary embodiments, without being limited thereto. Example 1:
Eine relaxationsfeste und warmfeste Zugfeder mit •folgenden Abmessungen:A relaxation-proof and heat-resistant tension spring with • the following dimensions:
80 Drahtdurchmesser 3,6 mm80 wire diameter 3.6 mm
Federkörperdurchmesser 41,5 mmSpring body diameter 41.5 mm
Ungespannte Länge Lo 268 mmUnstained length Lo 268 mm
Gespannte Federlänge Li 384 mmTensioned spring length Li 384 mm
L2 570 mm 85 wird hergestellt aus einem Walzstahl mit 8 mm 0 und folgender Zusammen¬ setzung:L2 570 mm 85 is produced from a rolled steel with 8 mm 0 and the following composition:
0,68 Gewichtsprozente Kohlenstoff 90 1 ,48 Gewichtsprozente Silizium0.68 weight percent carbon 90 1, 48 weight percent silicon
0,52 Gewichtsprozente Chrom 0,65 Gewichtsprozente Mangan und stahltypische Begleitelemente.0.52 percent by weight chromium 0.65 percent by weight manganese and accompanying elements typical of steel.
Dieser Walzstahl wird bei 900 °C austenitisiert, bei 540 "C isothermisch um- 95 gewandelt und nachfolgend an 3,6 mm kaltgezogen. Dabei wird eine Festig¬ keit Rm von 1900 N/mm2 erreicht. Dieser Draht wird vollautomatisch zu einer Zugfeder mit vorstehend genannten Abmessungen umgeformt und an¬ schließend bei 300 °C eine Stunde spannungsarm geglüht. Relaxationsverlust nach Prüfung auf L2 bei 145 °C 100 eine Stunde: 4,8 %This rolled steel is austenitized at 900 ° C., converted isothermally at 95 ° C. and then cold drawn to 3.6 mm. A strength Rm of 1900 N / mm 2 is achieved. This wire is fully automatically formed into a tension spring The above-mentioned dimensions are reshaped and then stress relieved for one hour at 300 ° C. Loss of relaxation after testing for L2 at 145 ° C. 100 one hour: 4.8%
Beispiel 2:Example 2:
Ein weiteres Beispiel bezieht sich auf die Herstellung einer Schraubendruck- 105 feder. Aus einem Walzstahl 5,5 mm 0 mit einer Zusammensetzung wie im Beispiel 1 wird eine analoge Wärme- und Kaltziehbehandlung bei der Zugfe¬ der ausgeführt und eine Druckfeder für eine Kraftstoffeinspritzpumpe mit folgenden Federdaten erzeugt: Drahtdurchmesser 1 ,4 mm Außendurchmeεser 7,3 mmAnother example relates to the manufacture of a helical compression spring. From a rolled steel 5.5 mm 0 with a composition as in Example 1, an analog heat and cold drawing treatment is carried out at the tension spring and a compression spring for a fuel injection pump with the following spring data is generated: Wire diameter 1, 4 mm outside diameter 7.3 mm
Ungespaπnte Länge 25,4 mmUnspanned length 25.4 mm
Reiaxationsprüfung bei L2 = 15,4 mm und 150 °C zwölf Stunden: 3,5 % Reiaxation test at L2 = 15.4 mm and 150 ° C twelve hours: 3.5%

Claims

Patentansprüche claims
1. Relaxationsfeste Stahlfeder mit hoher Festigkeit, gekennzeichnet durch folgende Merkmale1. Relaxation-resistant steel spring with high strength, characterized by the following features
- ein Stahldraht mit der Zusammensetzung von- a steel wire with the composition of
0,45 - 0,ff5 Gewichtsprozente Kohlenstolff 0,2 - 1 ,60 Gewichtsprozente Silizium0.45 - 0, ff5 percent by weight carbon 0.2 - 1.60 percent by weight silicon
0,3 - 1 ,50 Gewichtsprozente Mangan 0,4 - 1 ,20 Gewichtsprozente Chrom Rest Eisen und unvermeidliche Beimengungen0.3 - 1, 50 percent by weight manganese 0.4 - 1, 20 percent by weight chromium remainder iron and unavoidable additions
- der Draht wird austenitisiert und nachfolgend isothermisch im Tempera¬ turbereich zwischen 450 und 650 *C wärmebehandelt,the wire is austenitized and subsequently isothermally heat-treated in the temperature range between 450 and 650 * C,
- anschließend gezogen auf eine Zugfestigkeit von 1600 bis 2300 N/mm2 bei einer Brucheinschnürung von mindest 40 %,- subsequently drawn to a tensile strength of 1600 to 2300 N / mm 2 with a breaking neck of at least 40%,
- zu einer Feder kalt geformt und- cold formed into a spring and
- nachfolgend im Temperaturbereich von 200 - 350 °C spannungsarm geglüht.- subsequently annealed in the temperature range of 200 - 350 ° C.
2. Relaxationsfeste Stahlfeder nach Anspruch 1 , dadurch gekennzeichnet, daß der Stahl eine Vanadinbeimengung von 0,05 - 0,30 Gewichtsprozente hat.2. Relaxation-resistant steel spring according to claim 1, characterized in that the steel has a vanadium admixture of 0.05 - 0.30 percent by weight.
3 Relaxationsfeste Stahlfeder nach Anspruch 1 und 2, dadurch gekennzeich¬ net, daß der Stahl andere Beimengungen, wie3 relaxation-resistant steel spring according to claim 1 and 2, characterized gekennzeich¬ net that the steel other admixtures, such as
0,005 - 0,05 Gewichtsprozente Titan 0,01 - 0,2 Gewichtsprozente Niob und/oder Tantal 0,05 - 0,5 Gewichtsprozente Molybdän0.005 - 0.05 percent by weight titanium 0.01 - 0.2 percent by weight niobium and / or tantalum 0.05 - 0.5 percent by weight molybdenum
hat.Has.
4. Relaxationsfeste Stahlfeder nach Anspruch 1 bis 3, dadurch gekennzeich- net, daß die Elemente Chrom und Silizium ganz oder teilweise durch4. Relaxation-resistant steel spring according to claim 1 to 3, characterized in that the elements chromium and silicon are wholly or partly by
0,003 - 0,01 Gewichtsprozente Bor ersetzt werden. 0.003 - 0.01 weight percent boron are replaced.
5. Relaxationsfeste Stahlfeder nach Anspruch 1 bis 4, dadurch gekennzeich¬ net, daß sie eine schraubenförmige Gestalt besitzt.5. Relaxation-resistant steel spring according to claim 1 to 4, characterized gekennzeich¬ net that it has a helical shape.
6. Relaxationsfeste Stahlfeder nach Anspruch 1 bis 5, dadurch gekennzeich¬ net, daß der mittlere Federdurchmesser gleich oder kleiner dem Vierfachen des Drahtdurchmessers ist.6. Relaxation-resistant steel spring according to claim 1 to 5, characterized gekennzeich¬ net that the average spring diameter is equal to or less than four times the wire diameter.
7. Relaxationsfeste Stahlfeder nach Anspruch 1 bis 6, dadurch gekennzeich- net, daß sie zum Zwecke der Erhöhung der Dauerhaltbarkeit kugelgestrahlt ist.7. Relaxation-resistant steel spring according to claim 1 to 6, characterized in that it is shot-peened for the purpose of increasing the durability.
8. Relaxationsfeste Stahlfeder nach Anspruch 1 bis 7, dadurch gekennzeich¬ net, daß sie durch überelastische Verformung entweder bei Raumtempera- tur und/oder bei Temperaturen bis 400 °C vorgesetzt ist. 8. Relaxation-resistant steel spring according to claim 1 to 7, characterized gekennzeich¬ net that it is set by over-elastic deformation either at room temperature and / or at temperatures up to 400 ° C.
EP96919601A 1996-05-29 1996-05-29 Relaxation-resistant steel spring Expired - Lifetime EP0906453B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/DE1996/000935 WO1997045565A1 (en) 1996-05-29 1996-05-29 Relaxation-resistant steel spring

Publications (2)

Publication Number Publication Date
EP0906453A1 true EP0906453A1 (en) 1999-04-07
EP0906453B1 EP0906453B1 (en) 2001-08-22

Family

ID=6918350

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EP96919601A Expired - Lifetime EP0906453B1 (en) 1996-05-29 1996-05-29 Relaxation-resistant steel spring

Country Status (6)

Country Link
EP (1) EP0906453B1 (en)
AT (1) ATE204612T1 (en)
AU (1) AU5810896A (en)
CA (1) CA2256384A1 (en)
DE (1) DE59607551D1 (en)
WO (1) WO1997045565A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018183499A1 (en) 2017-03-28 2018-10-04 National Oilwell DHT, L.P. Valves for actuating downhole shock tools in connection with concentric drive systems
CN107557671B (en) * 2017-10-26 2019-05-14 山东汽车弹簧厂淄博有限公司 Microalloying spring steel and preparation method thereof
CN107587079B (en) * 2017-10-26 2019-05-14 山东汽车弹簧厂淄博有限公司 Nitrogenous microalloying spring steel and preparation method thereof
CN109161629A (en) * 2018-08-16 2019-01-08 敬业钢铁有限公司 A kind of LF refining method of spring steel

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Publication number Priority date Publication date Assignee Title
SE404703C (en) * 1976-09-20 1986-06-23 Garphytte Bruk Ab VALVE SPRING ROW OF LAYER ALLOY STEEL
JPS5925024B2 (en) * 1980-06-26 1984-06-13 株式会社神戸製鋼所 steel for suspension springs
JPH0796697B2 (en) * 1986-10-24 1995-10-18 大同特殊鋼株式会社 High strength spring steel
JP2613601B2 (en) * 1987-09-25 1997-05-28 日産自動車株式会社 High strength spring
JPH0257637A (en) * 1988-08-23 1990-02-27 Nippon Steel Corp Manufacture of spring with high fatigue strength and steel wire for spring for use therein
CA2002138C (en) * 1988-11-08 1999-12-14 Susumu Yamamoto High-strength coil spring and method of producing same
JPH02240240A (en) * 1989-03-10 1990-09-25 Aisin Seiki Co Ltd Diaphragm spring of clutch for automobile use

Non-Patent Citations (1)

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Title
See references of WO9745565A1 *

Also Published As

Publication number Publication date
DE59607551D1 (en) 2001-09-27
WO1997045565A1 (en) 1997-12-04
CA2256384A1 (en) 1997-12-04
EP0906453B1 (en) 2001-08-22
AU5810896A (en) 1998-01-05
ATE204612T1 (en) 2001-09-15

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