EP0138811A1 - Acier resistant a l'usure par abrasion - Google Patents

Acier resistant a l'usure par abrasion

Info

Publication number
EP0138811A1
EP0138811A1 EP19830902882 EP83902882A EP0138811A1 EP 0138811 A1 EP0138811 A1 EP 0138811A1 EP 19830902882 EP19830902882 EP 19830902882 EP 83902882 A EP83902882 A EP 83902882A EP 0138811 A1 EP0138811 A1 EP 0138811A1
Authority
EP
European Patent Office
Prior art keywords
manganese steel
austenitic
austenitic manganese
carbon
forming elements
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Withdrawn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
EP19830902882
Other languages
German (de)
English (en)
Inventor
Kevin F. Dolman
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.)
Vickers Australia Ltd
Original Assignee
Vickers Australia Ltd
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 Vickers Australia Ltd filed Critical Vickers Australia Ltd
Publication of EP0138811A1 publication Critical patent/EP0138811A1/fr
Withdrawn legal-status Critical Current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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
    • 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

  • THIS INVENTION relates to a range of improved austenitic manganese steel which can be selected for improved weld- ability, castability, wear resistance, high yield streng ⁇ th, high temperature resistance, low temperature impact resistance and/or corrosion resistance.
  • the final treatment necessary to develop the charac ⁇ teristic toughness and high work hardening capacity of conventional austenitic manganese steel consists of rapid cooling from the solution threatment tem ⁇ perature.
  • the rate of quenching is important since it is necessary to exceed a minimum critical cooling velocity to prevent the formation of embrittling carbides. This cooling rate requirement imposes a limitation on the maximum size of the steel section that can be effectively toughened.
  • the austenitic structure in conventional manganese steel is metastable and decomposes at temperatures above 350°C to form a number of embrittling phases as shown in the graph set forth in Fig. 1 of the accompanying drawings which is taken from Collette, G Crussard, C Kohn, A Plateau, J Pomey, G. et. Weisz, M., Rev de Met., (1957), 54, 433.
  • British Patent Specification No. 2007257B discloses an austenitic manganese steel for railway frogs containing 0.75 to 0.9% carbon, not more than 1% silicon, 12.5 to 15% manganese and 1.0 to 1.8%, molybdenum and which is weld- able. This composition is very close to the ASTM A128 Grade E-l specification for austenitic manganese steel for castings. Each of these products is essentially a lower carbon alloy than conventional manganese steel and is generally known to be less su ⁇ ceptible to embrittlement on reheating, such as occurs during welding. However con ⁇ trary to the test results given in the aforementioned patent specification manganese steel containing 0.8% car ⁇ bon has a lower work hardening capacity (i.e.
  • austenitic structure is retained during cooling from solution treatment and the formation of the embrittling phases referred to in Fig. 1 in austenitic manganese steel may be substantially retarded during heating above 350°C by the addition of sufficient quantities of one or more carbide forming elements, such as chromium, molybdenum, titanium, niobium, tungsten; and vanadium.
  • carbide forming elements such as chromium, molybdenum, titanium, niobium, tungsten; and vanadium.
  • the molybdenum referred to in the aforementioned British patent is a carbide forming element the amount used is not sufficient to significantly retard the decomposition of the austenitic structure and does not overcome the severe limitations of conventional austenitic manganese steels discussed above.
  • the present invention is based on the realisation that by using appr- priate amounts of carbide forming elements these limita ⁇ tions are substantially removed.
  • the invention resides in an austenitic manganese steel characterised by the addition of suffi ⁇ cient carbide forming elements to promote the retention of austenite during cooling from solution treatment.
  • the invention resides in an austenitic manganese steel characterised by the addition of suffi ⁇ cient carbide forming elements to retard decomposition of the retained austenite and formation of embrittling phases in the austenitic matrix when the steel is reheated.
  • the invention resides in an austenitic manganese steel characterised by the addition of suffi ⁇ cient carbide forming elements to produce a dispersion of undissolved primary carbides in the austenitic matrix.
  • Fig. 3 is a graph showing the effect of alloy compo ⁇ sition on the structure of solution treated and quenched Fe-Mn-C alloys;
  • Fig. 4 is a series of three graphs showing the iso ⁇ thermal characteristics of austenitic manganese steels (a) Fe-12.4Mn-l.28C (b) Fe-13.lMn-0.83C and (c) Fe-5.6Mn-l.22C;
  • Fig. 5A is a graph showing the isothermal transforma ⁇ tion diagram for Fe-13Mn-4Mo-1.2C;
  • Fig. 5B is a graph showing the age hardening charac ⁇ teristics Of Fe-13Mn-4Mo-1.2C.
  • Fig. 6 shows the variation of charpy impact values tested at 20°C after isothermal heating for one hour over a range of temperatures for Fe-13Mn-1.2C and Fe-14Mn-5Cr-0.6C.
  • the properties, wear resistance, toughness, castability, weldability impact resistance below 0°C and paramagnetism, are maximised in Fe-Mn-C alloys by maintaining a substan ⁇ tially wholly austenitic microstructure.
  • the austenite phase in the Fe-Mn-C system is retained by rapidly cooling a critical range of alloy compositions from the solution treatment temperature.
  • the critical carbon and manganese composition range is delineated in Fig. 3.
  • the retained austenite within this composition range is metastable and readily undergoes decomposition during isothermal heating at elevated temperatures or during continuous slow cooling from temperatures above the solvus line.
  • the decomposi ⁇ tion products are Widmanstatten cementite, grain boundary carbide and pearlite which embrittle the manganese steel, decrease wear resistance and cause a loss in paramagne- tism.
  • Fig. 4 illustrates that the decomposition of the retained austenite is retarded by:-
  • An upper limit of 25% manganese is selected since the work hardening capacity (i.e. wear resistance) is substantially reduced beyond this level.
  • the tensile yield strength drops below 300MPa at higher manganese contents and the melting point of the alloy is undesirably low.
  • the carbon content of the retained austenite may be re ⁇ pokerd by one of two methods :-
  • a finer grain size occurs on solution treatment.
  • the alloy Fe-13Mn-5Ti-2.5C, solution treated and water quenched from 1050 deg C exhibits a microstructure consisting of extremely hard (3000 HV) titanium carbide in an austenite matrix whose composition is similar to conventional austenitic manganese steel.
  • the strong carbide formers are austenite stabiliers and effectively retain the austenite phase on rapid cooling over a wider carbon and manganese range shown in Fig. 3.
  • the carbide forming element chromium is highly solu ⁇ ble in austenitic manganese steels and its use will result in an increased corrosion resistance. Performance similar to the stainless steel alloys, is anticipated at high chromium levels. Furthermore, additions of up to 10% nickel are expected to further enhance the corrosion resistance of chromium rich, austenitic manganese steels and, at the same time, produce an extremely tough, high strength wear resistant, weldable grade alloy.
  • the improved weldability of a modified austenitic man ⁇ ganese steel is illustrated by comparing of the effect of heat input on the impact properties relative to conven ⁇ tional austenitic manganese steels.
  • the modified alloy Fe-14Mn-5Cr-0.6C was used for com ⁇ parison with reference material Fe-13Mn-l.2C.
  • a further example of the invention was produced and selec ⁇ ted for investigation having a composition of 17% manga ⁇ nese, 6% chromium and 0.8% carbon.
  • the steel was cast and prepared by solution treatment followed by water quench ⁇ ing.
  • the decomposition characteristics of the alloy were determined by heating a number of samples of 550°C for periods of up to fifty hours.
  • Metallographic examination of the thermally aged samples showed that the development of transformation reaction products which cause severe embrittlement of conventional austenitic manganese steel is greatly retarded in the austenitic manganese steel modified according to the example of the invention.
  • One specific application of the example of the invention where the example offers a distinct advantage over conven ⁇ tional austenitic manganese steel relates to use with gyratory cone crusher mantle and bowl liners which may weigh up to several tonnes each. These are manufactured from austenitic manganese steel and are rendered unsuit ⁇ able for service after a certain amount of wear has occur ⁇ red. There is now a trend to re-build these worn com ⁇ ponents by overlaying their surfaces with a series of hard facing weld deposits. These weld deposition layers may be of a mass in the order of tonne to an excess of 1 tonne and usually require a total welding period in excess of fifty hours.
  • compositions for specific purposes can be tailored within the scope of the invention.
  • a steel comprising Fe-13Mn-7Mo and 0.8C suitably heat trea ⁇ ted exhibits improved hardness and yield strength as well as ability for continuous service at temperatures up to approximately 550°C whilst a composition of Fe-13Mn-10Cr-l.2C with up to 10% Ni exhibits improved corrosion and high temperature oxidation resistance.
  • a composition of Fe-17Mn-6Cr-0.8C with up to 10% nickel exhibits improved impact properties at cryorgenic tempera ⁇ tures since the stress induced.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)
  • Heat Treatment Of Steel (AREA)
  • Laminated Bodies (AREA)

Abstract

Acier au manganèse austénitique caractérisé par l'addition d'éléments de formation de carbure suffisant pour promouvoir la rétention de l'austénite lors du refroidissement de la trempe de solution, pour produire une dispersion de carbures primaires non dissous dans la matrice de l'austénite et pour retarder la décomposition de l'austénite retenue lors de la recuisson de l'acier. Sont donnés en exemple des aciers contenant, en pourcentage de poids, 0,6 à 2,5 de C, 10 à 17 de Mn et 4 à 10 de Cr (peut être lié avec du Ni), de Mo ou de Ti.
EP19830902882 1982-09-15 1983-09-15 Acier resistant a l'usure par abrasion Withdrawn EP0138811A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU5907/82 1982-09-15
AU590782 1982-09-15

Publications (1)

Publication Number Publication Date
EP0138811A1 true EP0138811A1 (fr) 1985-05-02

Family

ID=3696399

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830902882 Withdrawn EP0138811A1 (fr) 1982-09-15 1983-09-15 Acier resistant a l'usure par abrasion

Country Status (4)

Country Link
EP (1) EP0138811A1 (fr)
JP (1) JPS59501868A (fr)
NO (1) NO841923L (fr)
WO (1) WO1984001175A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110724874A (zh) * 2018-07-17 2020-01-24 宝钢特钢有限公司 具有抗腐蚀磨损性能的高锰奥氏体钢及热轧板制备方法

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4803045A (en) * 1986-10-24 1989-02-07 Electric Power Research Institute, Inc. Cobalt-free, iron-base hardfacing alloys
US5015823A (en) * 1986-12-12 1991-05-14 The Lincoln Electric Company High manganese containing weld bead and electrode for producing same
FI904500A (fi) * 1990-09-12 1992-03-13 Lokomo Oy Slitstarket staol och foerfarande foer framstaellning av detta.
CN114787407B (zh) * 2019-11-07 2023-10-17 伟尔矿物澳大利亚私人有限公司 用于高应力凿削磨蚀的合金
JP2024500882A (ja) * 2020-12-21 2024-01-10 ポスコ カンパニー リミテッド ブレーキディスク用オーステナイト系高マンガン鋼

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB263811A (en) * 1925-12-23 1927-11-03 Kohlswa Jernverks Ab Improved manufacture of steel
GB675265A (en) * 1944-11-03 1952-07-09 Philips Nv Improvements in or relating to wear resistant bodies
US3330651A (en) * 1965-02-01 1967-07-11 Latrobe Steel Co Ferrous alloys
DE1258112B (de) * 1965-11-03 1968-01-04 Bofors Ab Unmagnetischer Geschuetzrohrstahl
FR2093165A5 (en) * 1970-06-04 1972-01-28 Loire Atel Forges High strength, alloy steel - with low chromium content
GB1384234A (en) * 1971-01-28 1975-02-19 Dunford Hadfields Ltd Hot work tools made from steel alloys
GB1310183A (en) * 1971-04-20 1973-03-14 Prvni Brnenska Strojirna Austenitic steel alloys
BE793771A (fr) * 1973-01-08 1973-07-09 Ind De La Soudure Acier austenitique au manganese durci aux carbures de niobium et/ou de tantale pour le rechargement de pieces en acier
NO146959C (no) * 1980-07-07 1984-05-08 Raufoss Ammunisjonsfabrikker Austenitisk slitebestandig staal
JPS5864362A (ja) * 1981-10-14 1983-04-16 Kubota Ltd 高硬度非磁性合金

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8401175A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110724874A (zh) * 2018-07-17 2020-01-24 宝钢特钢有限公司 具有抗腐蚀磨损性能的高锰奥氏体钢及热轧板制备方法

Also Published As

Publication number Publication date
WO1984001175A1 (fr) 1984-03-29
JPS59501868A (ja) 1984-11-08
NO841923L (no) 1984-05-14

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Effective date: 19841218

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Inventor name: DOLMAN, KEVIN, F.