EP0824602B1 - Materiau d'acier a haute resistance thermique utile pour produire les parties superieures de pistons de moteurs - Google Patents

Materiau d'acier a haute resistance thermique utile pour produire les parties superieures de pistons de moteurs 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
Authority
EP
European Patent Office
Prior art keywords
steel
steel material
upper parts
engine piston
high thermal
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.)
Expired - Lifetime
Application number
EP96905866A
Other languages
German (de)
English (en)
Other versions
EP0824602A1 (fr
Inventor
Karl Wilhelm Wegner
Heinz Werner Breuer
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.)
Carl Dan Peddinghaus GmbH and Co KG
Original Assignee
Carl Dan Peddinghaus GmbH and Co KG
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 Carl Dan Peddinghaus GmbH and Co KG filed Critical Carl Dan Peddinghaus GmbH and Co KG
Publication of EP0824602A1 publication Critical patent/EP0824602A1/fr
Application granted granted Critical
Publication of EP0824602B1 publication Critical patent/EP0824602B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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.

Landscapes

  • 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)
  • Heat Treatment Of Articles (AREA)
  • Forging (AREA)

Claims (2)

  1. Matériau à base d'acier, présentant la composition suivante (en % en poids) :
    Mn : de 1,20 à 1,50
    Si : de 0,50 à 0,80
    C : de 0,35 à 0,40
    Mo : de 0,10 à 0,50
    V : de 0,08 à 0,13
    S : de 0,010 à 0,065
    Al : de 0,015 à 0,050
    P :≤ 0,035.
    Le reste étant du fer et des impuretés dues à la fabrication.
  2. Utilisation d'un matériau à base d'acier selon la revendication 1, pour la fabrication de parties supérieures de pistons de moteur.
EP96905866A 1996-03-06 1996-03-06 Materiau d'acier a haute resistance thermique utile pour produire les parties superieures de pistons de moteurs Expired - Lifetime EP0824602B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PCT/EP1996/000954 WO1997033010A1 (fr) 1996-03-06 1996-03-06 Materiau d'acier a haute resistance thermique utile pour produire les parties superieures de pistons de moteurs
CA002220255A CA2220255C (fr) 1996-03-06 1996-03-06 Materiau d'acier a haute resistance thermique utile pour produire les parties superieures de pistons de moteurs

Publications (2)

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

Family

ID=25679799

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96905866A Expired - Lifetime EP0824602B1 (fr) 1996-03-06 1996-03-06 Materiau d'acier a haute resistance thermique utile pour produire les parties superieures de pistons de moteurs

Country Status (3)

Country Link
EP (1) EP0824602B1 (fr)
CA (1) CA2220255C (fr)
WO (1) WO1997033010A1 (fr)

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 (de) * 1982-01-16 1983-12-22 M.A.N. Maschinenfabrik Augsburg-Nürnberg AG, 8900 Augsburg "Verwendung eines Kohlenstoff-Mangan-Stahles für Bauteile mit hoher Festigkeit und Zähigkeit bei einfacher Wärmebehandlung"
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
WO1997033010A1 (fr) 1997-09-12
CA2220255C (fr) 2005-05-10
CA2220255A1 (fr) 1997-09-12
EP0824602A1 (fr) 1998-02-25

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