EP0136433A1 - Acier au manganèse du type Hadfield austénitique et procédé pour sa fabrication - Google Patents

Acier au manganèse du type Hadfield austénitique et procédé pour sa fabrication Download PDF

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Publication number
EP0136433A1
EP0136433A1 EP84108536A EP84108536A EP0136433A1 EP 0136433 A1 EP0136433 A1 EP 0136433A1 EP 84108536 A EP84108536 A EP 84108536A EP 84108536 A EP84108536 A EP 84108536A EP 0136433 A1 EP0136433 A1 EP 0136433A1
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EP
European Patent Office
Prior art keywords
weight
content
vanadium
manganese steel
additives
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
EP84108536A
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German (de)
English (en)
Other versions
EP0136433B1 (fr
Inventor
Klaus D. Do Morumbi Ed. Alamo 10 C Normann
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.)
Kos Bernd Dipl-Ing
Original Assignee
Kos Bernd Dipl-Ing
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 Kos Bernd Dipl-Ing filed Critical Kos Bernd Dipl-Ing
Publication of EP0136433A1 publication Critical patent/EP0136433A1/fr
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Publication of EP0136433B1 publication Critical patent/EP0136433B1/fr
Expired 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
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese

Definitions

  • Such high manganese steel is characterized by a very high hardness and above all by its strengthening ability during cold forming; it can harden after use due to impact, impact, abrasive or pressure loads.
  • the stress results in a martensitic structural transformation in a surface layer, whereby the hardness in this layer increases from 200 HB to over 500 HB.
  • the hard surface layer is removed by abrasive stress, but at the same time it is constantly re-formed by the same stress.
  • the material below the surface layer has very good toughness and deformability. Austenitic manganese steels can therefore withstand large impact loads.
  • the area of application is therefore tools for mining, the processing of minerals, bulletproof dance plates or steel helmets etc.
  • the invention is based on an austenitic manganese high-carbon steel, as described, for example, in the DIN with the material no. 1st 3401 is described.
  • the alloy contents are in% by weight: C approx. 1.25, Mn 11 to 14, Cr to 2.5, Ni to 2 to stabilize the austenite, Mo to 2.5 to prevent coarse carbide deposits, the ratio the carbon content to the manganese content must be between 1: 8 and 1:14; that is, the manganese must match the carbon content on the one hand are sufficient for an austenitic structure and, on the other hand, must not stabilize the austenite so strongly that the hardening capacity suffers from cold working.
  • the object of the invention is to provide an austenitic manganese steel which can be hardened by cold working and which is fine-grained and deformable as uniformly as possible over the entire cross section without the disadvantages of the known measures.
  • the elongation at break should be at least 20% and the other mechanical properties should not deteriorate.
  • the vanadium and boron content are essential to the invention, the latter surprisingly not causing any deterioration in the mechanical properties.
  • Carbide-forming microalloying elements such as Ti, Zr, Nb are only used selectively and have no influence on grain refinement. Titanium binds any nitrogen present and prevents the formation of unwanted aluminum nitrides.
  • the boron has a grain-refining effect and slows down the excretion of grain boundary carbides, which has a favorable influence on the mechanical properties and - due to the shorter diffusion paths - the times required for heat treatments are reduced.
  • the aluminum content of the steel mentioned is expedient to ensure the safety of complete deoxidation necessary before the addition of boron.
  • the microalloy additives being added after the insert has melted in the electric furnace or in the ladle and the casting is subjected to a heat treatment after removal from the mold
  • the vanadium is preferably introduced into the melt in the electric furnace at the end of the refining period and feeding the boron to the melt in the ladle after deoxidation; but it is also possible to add both the boron and the vanadium only in the ladle;
  • the heat treatment preferably includes annealing at a temperature of 1050 to 1150 ° C and rapid cooling.
  • the melt Before deoxidation and setting the desired tapping temperature in the range 1450-1620 ° C, the melt is covered with a calcareous slag to keep a casting temperature in the tundish 1420-1520 0 C.
  • the heat treatment of the block castings or molded castings mentioned is expedient for balancing the mechanical properties over the entire cross section of the casting.
  • a water bath and / or cooling by flowing air, if appropriate after a first slower cooling step, are suitable for the cooling of the castings mentioned.
  • Pan A received an alloy addition of 2 kg of an alloy containing zircon and vanadium in a ratio of 1: 1 (zirconium and vanadium content each 0.1% by weight),
  • Pan B an addition of this alloy in the amount of 4 kg (zirconium and vanadium content each 0.2 wt .-%) and
  • Pan C added 100 g of vanadium (in the form of ferrovanadium) and 100 g of boron (in the form of ferrobor). (Vanadium and boron content each 0.01% by weight).
  • Crushing jaws with a wall thickness of 120 mm were cast from the metal of pans A to C, which also had a casting temperature of 1480 ° C, as is required for crushers to process ores.
  • the cooled castings were removed from the mold and annealed for two hours at a temperature of 1110 ° C. After removal from the oven, the crushing jaws were quickly cooled in a water bath.
  • Test pieces were taken from the castings of pans A to C at the edge and in the middle and their tensile strength and elongation at break were determined. The following values were obtained: One can see the superiority of the samples from pan C with the composition according to the invention both in terms of the absolutely higher values of tensile strength and in particular the elongation at break at all points of the bars, but especially in the middle thereof, and also the greater uniformity over the cross section.
  • Test pieces were taken from the inside and from the edge zone, which had an almost uniformly small grain, regardless of the location of the sampling.
  • the elongation at break and the tensile strength of the sample material were determined, which were 53 t 1% and 810 ⁇ 10 N / mm2 in all cases.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Heat Treatment Of Steel (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
EP84108536A 1983-08-05 1984-07-19 Acier au manganèse du type Hadfield austénitique et procédé pour sa fabrication Expired EP0136433B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT2850/83 1983-08-05
AT0285083A AT390807B (de) 1983-08-05 1983-08-05 Austenitischer manganhartstahl und verfahren zu seiner herstellung

Publications (2)

Publication Number Publication Date
EP0136433A1 true EP0136433A1 (fr) 1985-04-10
EP0136433B1 EP0136433B1 (fr) 1987-10-14

Family

ID=3541288

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84108536A Expired EP0136433B1 (fr) 1983-08-05 1984-07-19 Acier au manganèse du type Hadfield austénitique et procédé pour sa fabrication

Country Status (4)

Country Link
EP (1) EP0136433B1 (fr)
JP (1) JPS6056056A (fr)
AT (2) AT390807B (fr)
DE (1) DE3466781D1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0904154A1 (fr) * 1997-02-21 1999-03-31 GS Technologies Operating Company Milieu de broyage fin comprenant un acier martinsitique/austenitique renfermant une austenite transformable par l'effet des contraintes
EP1337679A1 (fr) * 2000-10-19 2003-08-27 The Frog Switch and Manufacturing Company Moulage d'acier au manganese austenitique a grain raffine presentant des microadditifs de vanadium et de titane et procede de fabrication
WO2006061261A1 (fr) * 2004-12-06 2006-06-15 F.A.R. - Fonderie Acciaierie Roiale - Spa Procede permettant d'obtenir un alliage d'acier au manganese ainsi qu'alliage d'acier au manganese ainsi obtenu
EP3778950A4 (fr) * 2018-03-29 2021-10-06 Nippon Steel Corporation Tôle d'acier austénitique résistante à l'usure

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2018412622A1 (en) 2018-03-29 2019-10-17 Nippon Steel Corporation Austenitic wear-resistant steel plate

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1215924A (en) * 1966-12-12 1970-12-16 Hadfields Ltd Process for pre-hardening manganese steel
SU322399A1 (fr) * 1970-07-03 1971-11-30
SU522261A1 (ru) * 1975-03-25 1976-07-25 Центральный научно-исследовательский институт черной металлургии им.И.П.Бардина Низколегированна сталь
SU581165A1 (ru) * 1976-06-16 1977-11-25 Уральский научно-исследовательский институт черных металлов Износостойка сталь
EP0091897A1 (fr) * 1982-04-13 1983-10-19 Voest-Alpine Stahl Aktiengesellschaft Acier au manganèse du type Hadfield, austénitique et durcissant par écrouissage et procédé pour sa fabrication

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4039328A (en) * 1975-08-11 1977-08-02 Jury Donatovich Novomeisky Steel

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1215924A (en) * 1966-12-12 1970-12-16 Hadfields Ltd Process for pre-hardening manganese steel
SU322399A1 (fr) * 1970-07-03 1971-11-30
SU522261A1 (ru) * 1975-03-25 1976-07-25 Центральный научно-исследовательский институт черной металлургии им.И.П.Бардина Низколегированна сталь
SU581165A1 (ru) * 1976-06-16 1977-11-25 Уральский научно-исследовательский институт черных металлов Износостойка сталь
EP0091897A1 (fr) * 1982-04-13 1983-10-19 Voest-Alpine Stahl Aktiengesellschaft Acier au manganèse du type Hadfield, austénitique et durcissant par écrouissage et procédé pour sa fabrication

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
"Stahlschlüssel", 10. Auflage, 1974, Seite 27, Verlag Stahlschlüssel Wegst KG, Marbach/Neckar, DE. *
E. HOUDREMONT: "Handbuch der Sonderstahlkunde", Band 1, 1956, Seiten 510-515, Springer Verlag, Berlin, DE; *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0904154A1 (fr) * 1997-02-21 1999-03-31 GS Technologies Operating Company Milieu de broyage fin comprenant un acier martinsitique/austenitique renfermant une austenite transformable par l'effet des contraintes
EP0904154A4 (fr) * 1997-02-21 2003-04-09 Mc Bvi Ltd Milieu de broyage fin comprenant un acier martinsitique/austenitique renfermant une austenite transformable par l'effet des contraintes
EP1337679A1 (fr) * 2000-10-19 2003-08-27 The Frog Switch and Manufacturing Company Moulage d'acier au manganese austenitique a grain raffine presentant des microadditifs de vanadium et de titane et procede de fabrication
EP1337679A4 (fr) * 2000-10-19 2004-06-09 Frog Switch And Mfg Company Moulage d'acier au manganese austenitique a grain raffine presentant des microadditifs de vanadium et de titane et procede de fabrication
WO2006061261A1 (fr) * 2004-12-06 2006-06-15 F.A.R. - Fonderie Acciaierie Roiale - Spa Procede permettant d'obtenir un alliage d'acier au manganese ainsi qu'alliage d'acier au manganese ainsi obtenu
US8636857B2 (en) 2004-12-06 2014-01-28 F.A.R.—Fonderie Acciaierie ROIALE SpA Method to obtain a manganese steel alloy
EP3778950A4 (fr) * 2018-03-29 2021-10-06 Nippon Steel Corporation Tôle d'acier austénitique résistante à l'usure

Also Published As

Publication number Publication date
ATE30249T1 (de) 1987-10-15
DE3466781D1 (en) 1987-11-19
EP0136433B1 (fr) 1987-10-14
JPS6056056A (ja) 1985-04-01
ATA285083A (de) 1989-12-15
AT390807B (de) 1990-07-10

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