EP0824602B1 - Steel material with high thermal resistance for producing engine piston upper parts - Google Patents

Steel material with high thermal resistance for producing engine piston upper parts Download PDF

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Publication number
EP0824602B1
EP0824602B1 EP96905866A EP96905866A EP0824602B1 EP 0824602 B1 EP0824602 B1 EP 0824602B1 EP 96905866 A EP96905866 A EP 96905866A EP 96905866 A EP96905866 A EP 96905866A EP 0824602 B1 EP0824602 B1 EP 0824602B1
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EP
European Patent Office
Prior art keywords
steel
steel material
upper parts
engine piston
high thermal
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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.)
Expired - Lifetime
Application number
EP96905866A
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German (de)
French (fr)
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EP0824602A1 (en
Inventor
Karl Wilhelm Wegner
Heinz Werner Breuer
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Carl Dan Peddinghaus GmbH and Co KG
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Carl Dan Peddinghaus GmbH and Co KG
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Publication of EP0824602A1 publication Critical patent/EP0824602A1/en
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    • 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
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • 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
    • C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur

Definitions

  • the invention relates to a steel material for the production of engine piston upper parts.
  • GB-A-2287956 relates to a hot-rolled, normalized steel which does not require an expensive thermal treatment, but has sufficient mechanical strength, with greatly improved toughness and improved gloss.
  • the steel has the following composition (in% by weight): 0.30 - 0.50% carbon, 0.15 - 0.60% silicon, 0.80 - 1.60% manganese, up to 0.02% phosphorus, up to 0.015% sulfur, 0.07 - 0.20% vanadium, 0.015 - 0.06% aluminum, 0.005 - 0.015% nitrogen, up to 0.0015% oxygen, the rest iron and unavoidable impurities.
  • the steel may also contain 0.02-0.15% molybdenum. According to Table II of this document, the tensile strengths of the steel are 817 - 859 N / mm 2 (83.0 - 87.7 Kg / mm 2 ).
  • the upper parts of the piston are generally made of 42CrMo4 in a range from 800 to 1100 N / mm 2 , ie hardened by heating from room temperature to 860 ° C and subsequent quenching in high-performance oil and by heating again to approx. 480 to 660 ° C tempered with final cooling in the container.
  • the temperatures in the hardening or tempering furnace are set in accordance with the respective steel analysis and the customer specifications regarding strength.
  • the problem on which the invention is based is to provide a material with which steel-forged piston upper parts can be produced without tempering and thus more cost-effectively, but without the wear, To impair corrosion and heat resistance properties.
  • the production-related impurities can in particular contain the elements Ni and Cr, which can generally be present in the steel material in an amount of ⁇ 0.20% by weight.
  • the steels according to the invention can be produced in a conventional manner in an electric furnace, with scrap being used as the starting material. This scrap is melted down in the electric furnace and the melt is then refined to reduce the phosphorus content.
  • the steel is tapped into a pan for secondary metallurgical treatment.
  • additives such as FeSi, FeCr, MnCr or FeMo are added, depending on the analysis of the steel obtained from the electric furnace, in order to adjust the ranges of the individual elements in the steel according to the invention.
  • aluminum is also added to calm down.
  • the melt is then homogenized in the ladle furnace and adjusted to the desired temperature. Then done by Add the additives mentioned above to fine-tune the weight of each element in the stressed steel. Gases dissolved in the melt, such as hydrogen, are then removed by degassing. If necessary, corrections are made to the aluminum content, which is then usually wound in wire form. Following the vacuum treatment, the melt is then poured off in the strand or block.
  • upper piston parts can be forged which no longer have to be tempered in order to achieve the desired high heat resistance properties.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Forging (AREA)
  • Heat Treatment Of Articles (AREA)

Description

Die Erfindung betrifft einen Stahlwerkstoff zur Herstellung von Motorkolbenoberteilen.
GB-A-2287956 betrifft einen heißgewalzten, normalisierten Stahl, der keine kostspielige thermische Vergütungsbehandlung erfordert aber eine ausreichende mechanische Festigkeit, bei stark verbesserter Zähigkeit und verbessertem Glanz aufweißt. Der Stahl weist die folgende Zusammensetzung auf(in Gew.%): 0.30 - 0.50% Kohlenstoff, 0.15 - 0.60% Silizium, 0.80 - 1.60% Mangan, bis zu 0.02% Phosphor, bis zu 0.015% Schwefel, 0.07 - 0.20% Vanadium, 0.015 - 0.06% Aluminium, 0.005 - 0.015% Stickstoff, bis zu 0.0015% Sauerstoff, der Rest Eisen und unvermeidbare Verunreinigungen. Der Stahl kann ferner 0.02 - 0.15% Molybdän enthalten. Gemäß Tabelle II dieses Dokuments liegen die Zugfestigkeiten des Stahls bei 817 - 859 N/mm2 (83.0 - 87.7 Kg/mm2).The invention relates to a steel material for the production of engine piston upper parts.
GB-A-2287956 relates to a hot-rolled, normalized steel which does not require an expensive thermal treatment, but has sufficient mechanical strength, with greatly improved toughness and improved gloss. The steel has the following composition (in% by weight): 0.30 - 0.50% carbon, 0.15 - 0.60% silicon, 0.80 - 1.60% manganese, up to 0.02% phosphorus, up to 0.015% sulfur, 0.07 - 0.20% vanadium, 0.015 - 0.06% aluminum, 0.005 - 0.015% nitrogen, up to 0.0015% oxygen, the rest iron and unavoidable impurities. The steel may also contain 0.02-0.15% molybdenum. According to Table II of this document, the tensile strengths of the steel are 817 - 859 N / mm 2 (83.0 - 87.7 Kg / mm 2 ).

Mit stahlgeschmiedeten Kolbenoberteilen lassen sich bei Dieselmotoren extrem hohe Verdichtungen bei guter Kraftstoffausnutzung, geringen Emissionen und hoher km-Laufleistung erzielen. Hierbei werden die Kolbenoberteile im allgemeinen aus dem Werkstoff 42CrMo4 in einer Spanne von 800 bis 1100 N/mm2 vergütet, d.h. durch Erwärmen von Raumtemperatur auf 860°C und anschließendes Abschrecken in Hochleistungsöl gehärtet und durch erneutes Erwärmen auf ca. 480 bis 660°C angelassen mit abschließender Abkühlung im Behälter. Die Temperaturen im Härte- bzw. Anlaßofen werden entsprechend der jeweiligen Stahlanalyse und den Kundenvorschriften hinsichtlich Festigkeit eingestellt.With steel-forged piston tops, extremely high compression ratios with good fuel efficiency, low emissions and high mileage can be achieved in diesel engines. The upper parts of the piston are generally made of 42CrMo4 in a range from 800 to 1100 N / mm 2 , ie hardened by heating from room temperature to 860 ° C and subsequent quenching in high-performance oil and by heating again to approx. 480 to 660 ° C tempered with final cooling in the container. The temperatures in the hardening or tempering furnace are set in accordance with the respective steel analysis and the customer specifications regarding strength.

Nur mit dem obengenannten Stahl und dem Schmiedeverfahren können die von den Verbrauchern geforderten Verschleiß-, Korrosions- und Warmfestigkeitseigenschaften der Kolbenoberteile erzielt werden. Das Konstruktionsprinzip des Pendelschaftkolbens mit stahlgeschmiedetem Oberteil und Aluminiumhemd hat jedoch den Nachteil, daß der Motor im Vergleich zu einteilig aus Aluminium hergestellten Kolben teuerer ist, bedingt auch durch die Vergütung (Wärmebehandlung) des Kolbenoberteils aus Stahl.Only with the above-mentioned steel and the forging process can the wear, corrosion and heat resistance properties of the piston upper parts required by the consumers be achieved. However, the design principle of the pendulum-shaft piston with a steel-forged upper part and aluminum shirt has the disadvantage that the engine is more expensive than pistons made of one-piece aluminum, also due to the tempering (heat treatment) of the upper piston part made of steel.

Das der Erfindung zugrundeliegende Problem besteht darin, einen Werkstoff bereitzustellen, mit dem stahlgeschmiedete Kolbenoberteile ohne Vergütung und somit kostengünstiger hergestellt werden können, ohne aber die Verschleiß-, Korrosions- und Warmfestigkeitseigenschaften zu beeinträchtigen.The problem on which the invention is based is to provide a material with which steel-forged piston upper parts can be produced without tempering and thus more cost-effectively, but without the wear, To impair corrosion and heat resistance properties.

Dieses Problem wird erfindungsgemäß durch einen Stahlwerkstoff gelöst, der die folgende Zusammensetzung (Gew.%) aufweist:

  • Mn: 1,20 bis 1,50
  • Si: 0,50 bis 0,80
  • C: 0,35 bis 0,40
  • Mo: 0,10 bis 0,50
  • V: 0,08 bis 0,13
  • S: 0,010 bis 0,065
  • Al: 0,015 bis 0,050
  • P: ≤ 0,035
    Rest Eisen und herstellungsbedingte Verunreinigungen
According to the invention, this problem is solved by a steel material which has the following composition (% by weight):
  • Mn: 1.20 to 1.50
  • Si: 0.50 to 0.80
  • C: 0.35 to 0.40
  • Mo: 0.10 to 0.50
  • V: 0.08 to 0.13
  • S: 0.010 to 0.065
  • Al: 0.015 to 0.050
  • P: ≤ 0.035
    Balance iron and manufacturing-related impurities

Die herstellungsbedingten Verunreinigungen können hierbei insbesondere die Elemente Ni und Cr beinhalten, die im allgemeinen jeweils in einer Menge < 0,20 Gew.% in dem Stahlwerkstoff vorliegen können.The production-related impurities can in particular contain the elements Ni and Cr, which can generally be present in the steel material in an amount of <0.20% by weight.

Die erfindungsgemäßen Stähle lassen sich hierbei in üblicher Weise in einem Elektroofen erzeugen, wobei man als Ausgangsmaterial Schrott einsetzt. Dieser Schrott wird im Elektroofen eingeschmolzen, und die Schmelze wird anschließend zur Reduzierung des Phosphorgehaltes gefrischt. Der Stahl wird in eine Pfanne zur sekundärmetallurgischen Behandlung abgestochen. Dies bedeutet, daß Zuschlagstoffe wie FeSi, FeCr, MnCr oder FeMo, in Abhängigkeit der Analyse des aus dem Elektroofen gewonnenen Stahls, hinzugefügt werden, um die Bereiche der einzelnen Elemente in dem erfindungsgemäßen Stahl einzustellen. Hierbei wird auch Aluminium zur Beruhigung zugegeben. Im Pfannenofen erfolgt dann die Homogenisierung der Schmelze und ihre Einstellung auf die jeweils gewünschte Temperatur. Anschließend erfolgt durch Zugabe der bereits oben genannten Zuschlagstoffe die Feineinstellung der Gewichtsmengen der einzelnen Elemente in dem beanspruchten Stahl. Anschließend werden in der Schmelze gelöste Gase, wie z.B. Wasserstoff, durch Entgasen entfernt. Nötigenfalls werden hier noch Korrekturen bezüglich des Aluminiumgehalts vorgenommen, der dann üblicherweise in Drahtform eingespult wird. Im Anschluß an die Vakuumbehandlung wird dann die Schmelze im Strang oder Block abgegossen.The steels according to the invention can be produced in a conventional manner in an electric furnace, with scrap being used as the starting material. This scrap is melted down in the electric furnace and the melt is then refined to reduce the phosphorus content. The steel is tapped into a pan for secondary metallurgical treatment. This means that additives such as FeSi, FeCr, MnCr or FeMo are added, depending on the analysis of the steel obtained from the electric furnace, in order to adjust the ranges of the individual elements in the steel according to the invention. Here aluminum is also added to calm down. The melt is then homogenized in the ladle furnace and adjusted to the desired temperature. Then done by Add the additives mentioned above to fine-tune the weight of each element in the stressed steel. Gases dissolved in the melt, such as hydrogen, are then removed by degassing. If necessary, corrections are made to the aluminum content, which is then usually wound in wire form. Following the vacuum treatment, the melt is then poured off in the strand or block.

Mit dem erfindungsgemäßen Stahl können Kolbenoberteile stahlgeschmiedet werden, die nicht mehr vergütet werden müssen, um die gewünschten hohen Warmfestigkeitseigenschaften zu erzielen. Die Kolbenoberteile werden aus der Umformwärme geregelt abgekühlt (BY-Behandlung = BEST YIELD).With the steel according to the invention, upper piston parts can be forged which no longer have to be tempered in order to achieve the desired high heat resistance properties. The upper piston parts are cooled in a controlled manner from the forming heat (BY treatment = BEST YIELD).

Beispielexample

Gemäß dem oben dargestellten Verfahrensweg wurde ein erfindungsgemäßer Stahlwerkstoff hergestellt, der die folgende Zusammensetzung aufweist:

  • Mn: 1,31
  • Si: 0,57
  • C: 0,38
  • Mo: 0,43
  • V: 0,11
  • S: 0,046
  • Al: 0,024
  • P: 0,011
  • Cr: 0,17
  • Ni: 0,03
  • Rest Eisen
A steel material according to the invention, which has the following composition, was produced in accordance with the above-described process path:
  • Mn: 1.31
  • Si: 0.57
  • C: 0.38
  • Mo: 0.43
  • V: 0.11
  • S: 0.046
  • Al: 0.024
  • P: 0.011
  • Cr: 0.17
  • Ni: 0.03
  • Rest of iron

Der Stahl der obigen Zusammensetzung wurde hinsichtlich seiner mechanischen Eigenschaften mit dem Stahl 42CrMo4 (Standardanalyse nach Norm EN 10083) verglichen. Die Ergebnisse sind in der folgenden Tabelle dargestellt. Tabelle: Vergleich von Warmzugproben 42CrMo4 Raumtemperatur 500°C Zugfestigkeit Rm (N/mm2) 930 630 Streckgrenze Rp 0,2 (N/mm2) 480 Einschnürung Z (%) 75 Dehnung A5 (%) 25 Stahl gemäß Beispiel Raumtemperatur 500°C Zugfestigkeit Rm (N/mm2) 1020 810 Streckgrenze Rp 0,2 (N/mm2) 605 Einschnürung Z (%) 58 Dehnung A5 (%) 14,5 The steel of the above composition was compared with the steel 42CrMo4 in terms of its mechanical properties (Standard analysis according to standard EN 10083) compared. The results are shown in the following table. Table: Comparison of hot tensile tests 42CrMo4 Room temperature 500 ° C Tensile strength Rm (N / mm 2 ) 930 630 Yield strength Rp 0.2 (N / mm 2 ) 480 Constriction Z (%) 75 Elongation A5 (%) 25th Steel according to the example Room temperature 500 ° C Tensile strength Rm (N / mm 2 ) 1020 810 Yield strength Rp 0.2 (N / mm 2 ) 605 Constriction Z (%) 58 Elongation A5 (%) 14.5

Die Werte der obigen Tabelle legen die vorteilhaften mechanischen Eigenschaften des erfindungsgemäßen Stahles dar.The values in the above table show the advantageous mechanical properties of the steel according to the invention.

Claims (2)

  1. Steel material having the following composition (wt.%):
    Mn: 1.20 to 1.50
    Si: 0.50 to 0.80
    C: 0.35 to 0.40
    Mo: 0.10 to 0.50
    V: 0.08 to 0.13
    S: 0.010 to 0.065
    Al: 0.015 to 0.050
    P: ≤ 0.035
    remainder iron and production-related impurities.
  2. Use of a steel material according to claim 1 for producing upper parts of an engine piston.
EP96905866A 1996-03-06 1996-03-06 Steel material with high thermal resistance for producing engine piston upper parts Expired - Lifetime EP0824602B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PCT/EP1996/000954 WO1997033010A1 (en) 1996-03-06 1996-03-06 Steel material with high thermal resistance for producing engine piston upper parts
CA002220255A CA2220255C (en) 1996-03-06 1996-03-06 Steel material with high thermal resistance for producing engine piston upper parts

Publications (2)

Publication Number Publication Date
EP0824602A1 EP0824602A1 (en) 1998-02-25
EP0824602B1 true EP0824602B1 (en) 2001-09-19

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EP96905866A Expired - Lifetime EP0824602B1 (en) 1996-03-06 1996-03-06 Steel material with high thermal resistance for producing engine piston upper parts

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EP (1) EP0824602B1 (en)
CA (1) CA2220255C (en)
WO (1) WO1997033010A1 (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2229140A (en) * 1939-12-20 1941-01-21 Republic Steel Corp Abnormal steel
DE3201204C2 (en) * 1982-01-16 1983-12-22 M.A.N. Maschinenfabrik Augsburg-Nürnberg AG, 8900 Augsburg "Use of a carbon-manganese steel for components with high strength and toughness with simple heat treatment"
GB9116412D0 (en) * 1990-08-03 1991-09-11 Samsung Heavy Ind High toughness non-refined steels and method for manufacturing them
GB2287956B (en) * 1994-03-31 1998-02-04 Daewoo Heavy Ind Co Ltd Thermal refiningless hot-rolled steel and method of making same

Also Published As

Publication number Publication date
CA2220255C (en) 2005-05-10
CA2220255A1 (en) 1997-09-12
EP0824602A1 (en) 1998-02-25
WO1997033010A1 (en) 1997-09-12

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