DE3533493A1 - Process for producing components from steel of high strength and at the same time high toughness, having these properties even after hot deformation - Google Patents

Process for producing components from steel of high strength and at the same time high toughness, having these properties even after hot deformation

Info

Publication number
DE3533493A1
DE3533493A1 DE19853533493 DE3533493A DE3533493A1 DE 3533493 A1 DE3533493 A1 DE 3533493A1 DE 19853533493 DE19853533493 DE 19853533493 DE 3533493 A DE3533493 A DE 3533493A DE 3533493 A1 DE3533493 A1 DE 3533493A1
Authority
DE
Germany
Prior art keywords
steel
high strength
hot deformation
properties even
same time
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.)
Withdrawn
Application number
DE19853533493
Other languages
German (de)
Inventor
Hans Dipl Ing Mueller
Max Dr Ing Albert
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.)
MAN Truck and Bus SE
Original Assignee
MAN Nutzfahrzeuge AG
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 MAN Nutzfahrzeuge AG filed Critical MAN Nutzfahrzeuge AG
Priority to DE19853533493 priority Critical patent/DE3533493A1/en
Priority to ZA866747A priority patent/ZA866747B/en
Priority to SE8603897A priority patent/SE8603897L/en
Priority to FR8613008A priority patent/FR2588570A1/en
Priority to GB8622344A priority patent/GB2182675B/en
Priority to JP61218271A priority patent/JPS62116719A/en
Priority to US06/909,744 priority patent/US4737202A/en
Publication of DE3533493A1 publication Critical patent/DE3533493A1/en
Withdrawn legal-status Critical Current

Links

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
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
    • C21D1/20—Isothermal quenching, e.g. bainitic hardening
    • 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
    • C21D9/0093—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for screws; for bolts

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)
  • Forging (AREA)

Abstract

According to the invention, a bainite microstructure is obtained for steel-based components, which are subjected to hot deformation, by the addition of carbide-, nitride- and carbonitride-forming elements such as, for example, Nb to a steel having a carbon content of less than 0.3 per cent by weight; this microstructure is preserved even after hot deformation followed by controlled cooling. Alloy elements such as Mn, B and Mo assist the formation of bainite. A process of this type has the advantage that components such as, for example, lorry king pins, which are forged at temperatures of up to 1300 DEG C, no longer have to be re-hardened by a tempering stage after cooling, so that they still also have adequate toughness in addition to high strength.

Description

Verfahren zur Herstellung von Bauteilen aus Stahl mit hoher Festigkeit bei gleichzeitig hoher Zähigkeit, welche diese Eigenschaften auch nach einer Warmverformung aufweisen.Process for the production of steel components with high strength combined with high toughness, which these properties even after hot working exhibit.

Die Erfindung bezieht sich auf ein Verfahren zur Herstellung von Bauteilen aus Stahl mit hoher Festigkeit bei gleichzeitig hoher Zähigkeit, welche diese Eigenschaften auch nach einer Warmverformung aufweisen.The invention relates to a method of manufacture of steel components with high strength at the same time high toughness, which these properties even after hot forming.

Stähle haben die Eigenschaft, daß sie nach einer Warmbehandlung zwar hohe Festgkeit aber eine unzureichende Zähigkeit aufweisen. Für viele Bauteile wie z. B. die Achsschenkelbolzen von Lastkraftwagen ist es wünschenswert, daß sich hohe Festigkeit mit ausreichender Zähigkeit des Wirkstoffes paart.Steels have the property that they are after a heat treatment high strength, but insufficient Have toughness. For many components such as B. the Kingpin of trucks it is desirable that high strength with sufficient toughness of the active ingredient pairs.

Der Erfindung liegt daher die Aufgabe zugrunde, Bauteile auf Stahlbasis zu fertigen, bei denen trotz einer Warmverformung ohne besondere Nachbehandlung der Werkstoff neben hoher Festigkeit eine ausreichende Zähigkeit aufweist.The invention is therefore based on the object of components to manufacture on the basis of steel, in which despite a hot forming without special post-treatment of the material in addition to high strength, has sufficient toughness.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß
a) der Stahl einen Kohlenstoffgehalt von weniger als 0,3 Gewichtsprozenten aufweist
b) daß Mikrolegierungselemente karbid- und/oder nitrid- und/oder karbonitridbildender Art wie z. B. Nb zulegiert werden
c) daß bainitbildende Elemente wie z. B. Mn, B und Mo zugegeben werden
d) daß die Abkühlungsgeschwindigkeit so gesteuert wird, daß bainitisches Gefüge entsteht.This object is achieved in that
a) the steel has a carbon content of less than 0.3 percent by weight
b) that microalloying elements of carbide and / or nitride and / or carbonitride-forming type such. B. Nb are alloyed
c) that bainite-forming elements such. B. Mn, B and Mo can be added
d) that the cooling rate is controlled so that a bainitic structure is formed.

Ein Verfahren dieser Art beinhaltet den Vorteil, daß Bauteile, wie z. B. die Achsschenkelbolzen von Lastkraftwagen trotz Schmiedearbeiten bei Temperaturen bis zu 1300°C ohne nachgeschaltete Wärmebehandlung, wie z. B. Anlaßglühen ein feinkörniges bainitisches Gefüge aufweisen, bei dem sich zu hoher Festigkeit eine ausreichende Zähigkeit gesellt.A method of this type has the advantage that components, such as B. the kingpin of trucks despite forging work at temperatures up to 1300 ° C without downstream heat treatment, such as B. Annealing have a fine-grained bainitic structure, at sufficient toughness joins.

Bei der Herstellung von Bauteilen mit den eingangs gewünschten Eigenschaften geht man erfindungsgemäß von einem Stahl mit einem Kohlenstoffanteil von weniger als 0,3 Gewichtsprozenten aus, dem Mikrolegierungselemente wie z. B. Nb oder auch Ti, Zr oder V aber auch Al zulegiert sind. Diese Legierungselemente haben zur Folge, daß durch Karbid, Nitrid oder Nitrokarbidbildung bei Warmverformung eines derartigen Bauteiles trotz Arbeitstemperaturen bis zu 1300°C ein Kornwachstum mit all seinen bekannten negativen Auswirkungen in Grenzen gehalten wird. Weitere Zusätze von Mn, B und Mo unterstützen die Bainitbildung. Dadurch werden vor allem Bearbeitungskosten gespart, da die Werkstücke nach der Warmverformung nicht mehr durch eine nachgeschaltete Anlaßglühung vergütet werden müssen.In the manufacture of components with the desired ones According to the invention, properties are taken from a steel a carbon content of less than 0.3 percent by weight from the micro-alloying elements such. B. Nb or Ti, Zr or V but also Al are alloyed. These alloying elements have the consequence that by carbide, nitride or nitro carbide formation in the case of hot deformation of such a component despite working temperatures up to 1300 ° C a grain growth with all its known negative effects are kept within limits. Additional additions of Mn, B and Mo support the formation of bainite. Above all, this saves processing costs, since the workpieces no longer pass through after hot forming a subsequent annealing must be remunerated.

Um das gewünschte Gefüge zu erhalten, muß die Abkühlungsgeschwindigkeit so gesteuert werden, daß bainitische Gefüge erzielt wird. Das gewünschte Abkühlungsverfahren hängt dann im wesentlichen von den geometrischen Abmessungen des Bauteiles ab. Bekannte Verfahren wie Abkühlung bei ruhiger Luft, bewegter Luft, Sprühnebel eines Kühlmittels, Ölbad, Salzbad, Wirbelschichtkühlung, Wasser mit Zusätzen von Salz oder Lauge, um nur einige Beispiele zu nennen, können Anwendung finden.In order to obtain the desired structure, the cooling rate must be can be controlled so that bainitic structure is achieved. The desired cooling process then depends essentially from the geometric dimensions of the component from. Known methods such as cooling down in a quiet place Air, moving air, spray of a coolant, oil bath,  Salt bath, fluidized bed cooling, water with additives from Salt or lye, to name just a few examples Find application.

Ein Vorteil des erfindungsgemäßen Verfahrens kann darin bestehen, daß sich vor allem in den Randzonen, die hoch belastet sind, bainitisches Gefüge einstellt, während die weniger belasteten Gebiete um die neutrale Faser grobkörnigeres Gefüge aufweisen können.An advantage of the method according to the invention can be that especially in the peripheral areas that are highly stressed are bainitic, while the less areas around the neutral fiber more coarse May have structures.

Mit einem Stahl gemäß dem Patentanspruch, 10 Mn Nb B7, konnten an einem Rundmaterial von 70 mm Durchmesser in einem Abstand von 1/3 des Radius von außen gemessen, Werte nachgewiesen werden, die die Mindestwerte eines Stahles 42 Cr Mo 4 nach   Din 17 200 mit Rm = 1 000 N mm-2, Rp 0,2 = 850 N mm-2 und Av = 80 J übersteigen.With a steel according to the patent claim, 10 Mn Nb B7, it was possible to measure values on a round material of 70 mm diameter at a distance of 1/3 of the radius from the outside, values which could be verified as the minimum values of a steel 42 Cr Mo 4 according to Din 17 200 with Rm = 1 000 N mm -2 , Rp 0.2 = 850 N mm -2 and Av = 80 J.

Claims (1)

Verfahren zur Herstellung von Bauteilen aus Stahl mit hoher Festigkeit bei gleichzeitig hoher Zähigkeit, welche diese Eigenschaften auch nach einer Warmverformung aufweisen, dadurch gekennzeichnet, daß,
a) der Stahl einen Kohlenstoffgehalt von weniger als 0,3 Gewichtsprozenten aufweist
b) daß Mikrolegierungselemente karbid- und/oder nitrid- und/oder karbonitridbildender Art wie z. B. Nb zulegiert werden
c) daß bainitbildende Elemente wie z. B. Mn, B und Mo zugegeben werden
d) daß die Abkühlungsgeschwindigkeit so gesteuert wird, daß bainitisches Gefüge entsteht.Process for the production of steel components with high strength and high toughness, which have these properties even after hot forming, characterized in that
a) the steel has a carbon content of less than 0.3 percent by weight
b) that microalloying elements of carbide and / or nitride and / or carbonitride-forming type such. B. Nb are alloyed
c) that bainite-forming elements such. B. Mn, B and Mo can be added
d) that the cooling rate is controlled so that a bainitic structure is formed.
DE19853533493 1985-09-19 1985-09-19 Process for producing components from steel of high strength and at the same time high toughness, having these properties even after hot deformation Withdrawn DE3533493A1 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
DE19853533493 DE3533493A1 (en) 1985-09-19 1985-09-19 Process for producing components from steel of high strength and at the same time high toughness, having these properties even after hot deformation
ZA866747A ZA866747B (en) 1985-09-19 1986-09-05 Method of making components of steel with high-strength and simultaneously high toughness which retain these properties also after a hot forming operation
SE8603897A SE8603897L (en) 1985-09-19 1986-09-16 PROCEDURE FOR THE MANUFACTURE OF STEEL CONSTRUCTIONS
FR8613008A FR2588570A1 (en) 1985-09-19 1986-09-17 PROCESS FOR THE MANUFACTURE OF HIGH STRENGTH STEEL CONSTRUCTION ELEMENTS WITH AT THE SAME TIME A HIGH TENACITY, THESE PARTS HAVING THE SAME PROPERTIES EVEN AFTER THERMAL DEFORMATION
GB8622344A GB2182675B (en) 1985-09-19 1986-09-17 A method of making components of steel with high-strength and high toughness
JP61218271A JPS62116719A (en) 1985-09-19 1986-09-18 Production of structural member from steel having both of high strength and high toughness
US06/909,744 US4737202A (en) 1985-09-19 1986-09-19 Method of producing steel components that simultaneously have high strength and high ductility and which retain these properties even after a hot forming operation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19853533493 DE3533493A1 (en) 1985-09-19 1985-09-19 Process for producing components from steel of high strength and at the same time high toughness, having these properties even after hot deformation

Publications (1)

Publication Number Publication Date
DE3533493A1 true DE3533493A1 (en) 1987-03-26

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ID=6281420

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19853533493 Withdrawn DE3533493A1 (en) 1985-09-19 1985-09-19 Process for producing components from steel of high strength and at the same time high toughness, having these properties even after hot deformation

Country Status (3)

Country Link
JP (1) JPS62116719A (en)
DE (1) DE3533493A1 (en)
ZA (1) ZA866747B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4856320B2 (en) * 2001-03-09 2012-01-18 アイシン機工株式会社 Oil mist removal device
JP6379731B2 (en) * 2014-06-26 2018-08-29 新日鐵住金株式会社 High-strength steel material and manufacturing method thereof
CN114210897A (en) * 2021-12-28 2022-03-22 扬州志程机械锻造有限公司 Forging method of high-carbon high-chromium steel forging and forging

Also Published As

Publication number Publication date
ZA866747B (en) 1987-05-27
JPS62116719A (en) 1987-05-28

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Legal Events

Date Code Title Description
8143 Withdrawn due to claiming internal priority