EP3853389A1 - Acier pour le durcissement de surface ayant une dureté superficielle élevée et une structure de base ductile fine - Google Patents

Acier pour le durcissement de surface ayant une dureté superficielle élevée et une structure de base ductile fine

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Publication number
EP3853389A1
EP3853389A1 EP19773026.0A EP19773026A EP3853389A1 EP 3853389 A1 EP3853389 A1 EP 3853389A1 EP 19773026 A EP19773026 A EP 19773026A EP 3853389 A1 EP3853389 A1 EP 3853389A1
Authority
EP
European Patent Office
Prior art keywords
steel
weight
steel according
content
hardening
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.)
Pending
Application number
EP19773026.0A
Other languages
German (de)
English (en)
Inventor
Serosh Engineer
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.)
Ezm Edelstahlzieherei Mark GmbH
Original Assignee
Ezm Edelstahlzieherei Mark GmbH
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 Ezm Edelstahlzieherei Mark GmbH filed Critical Ezm Edelstahlzieherei Mark GmbH
Publication of EP3853389A1 publication Critical patent/EP3853389A1/fr
Pending 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
    • 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
    • C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
    • 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
    • C21D9/40—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rings; for bearing races
    • 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
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • 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
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • 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
    • 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
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
    • C23C8/20—Carburising
    • C23C8/22—Carburising of ferrous surfaces
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/28—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases more than one element being applied in one step
    • C23C8/30—Carbo-nitriding
    • C23C8/32—Carbo-nitriding of ferrous surfaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
    • F16G13/00—Chains
    • 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
    • C21D1/06—Surface hardening

Definitions

  • the invention relates to a steel which is suitable for surface hardening and has a high hardness on the surface and a high
  • Depth of hardening enables.
  • the invention relates to a steel that has the potential to
  • Composition of the material also have sufficient hardenability.
  • case-hardened components are manufactured, for example, from the steel known under the name "14CrNiMo5", which according to the directional analysis consists of (in% by weight) 0.12% C, 1.40% Cr, 0.30% Mo and 1 , 6% Ni, balance iron and unavoidable impurities.
  • this steel does not achieve the required high surface hardness with the necessary certainty after direct hardening.
  • German standard DIN 17115 (current edition 2012 - 07) deals with the technical delivery conditions for steels for welded
  • Ni: 1.35-1.65, N: ⁇ 0.012, Cu: ⁇ 0.020; Rest Fe) is a material that is used for the production of case-hardened round steel chains can be used. But even this steel does not achieve the minimum surface hardness of> 820 HV1 after direct hardening.
  • the materials listed in the delivery conditions such as 20MnCrMo3-2 (1.6522: (content in% by weight) C: 0.17 - 0.23, Si: ⁇ 0.40, Mn: 0.60 - 0.95, P ⁇ 0.025, S: ⁇ 0.015, Cr: 0.35-0.65, Mo: 0.15-0.25, No: 0.40-0.70, AI: ⁇ 0.050, Cu: ⁇ 0.30 , Rest Fe), 23MnNiCrMo5-3 (1.6540:
  • EP 1 905 857 B1 is another high-strength steel with (in% by weight) C: 0.15 - 0.3%, Si: 0.1 - 0.5%, Mn: 0.6 - 1, 8%, Cr: 1, 0 - 1, 8%, Mo: 0.10 - 0.50%, Ni: up to 0.50%, Nb: 0.030 - 0.150%, Ti: 0.020 - 0.060%, AI: 0.010 - 0.060%, N: 0.008 - 0.030%, P: ⁇ 0.030%, S: ⁇ 0.030%, balance iron and unavoidable impurities known.
  • This steel also does not achieve the required high surface hardness of more than 820 HV1 during direct hardening from the case heat.
  • the tests show that the hardness of the core structure at 425 HV is too high and, as a result, the toughness of the core structure is too low to withstand high sudden break stresses.
  • Relaxation annealing not only has the potential to develop a hardened surface layer with a high surface hardness, in particular more than 820 HV1, but also has a tough, fine-grained core structure and at the same time is easy to weld. Its properties are intended to make a steel according to the invention particularly suitable for the production of chains and individual chain parts for areas of application of the type described in DIN 17115.
  • the invention has achieved this object by means of a steel having the composition specified in claim 1.
  • a steel according to the invention which meets the above-mentioned requirements accordingly consists of (in% by weight)
  • the steel according to the invention is composed such that it
  • the steel according to the invention typically has a structure in the core that essentially consists of
  • fine-grained, ductile martensite and bainite is characterized by a grain size of 6 and finer, determined according to the ASTM E112 standard.
  • a steel according to the invention has good weldability.
  • it can be used for the manufacture of chain links
  • Presence of C in the steel according to the invention if the C content is at least 0.12% by weight. If the C content is above 0.19% by weight, there is a risk that the core hardness of the steel will increase too much and the ductility or toughness of the core structure is impaired. Furthermore, the limitation to at most 0.19% by weight of C, in particular less than 0.19% by weight of C, contributes to the good weldability of the steel.
  • An optimized embodiment of the invention provides that the C content is limited to at most 0.16% by weight, in particular at most 0.13% by weight, in order to minimize any negative influence of C on the properties of the steel.
  • the silicon (“Si”) content of a steel according to the invention should be as low as possible, since silicon leads to a solidification of the structure. Such an increase in hardening proves to be particularly harmful if no stress relief annealing is carried out after the surface hardening.
  • Manganese can be added to the steel according to the invention to increase its hardenability. Since Mn lowers the transition temperatures into the ferrite / pearlite and martensite stage, the Mn content is
  • Mn content can be increased to at least 0.7% by weight of Mn.
  • the content of phosphorus ("P") is kept as low as possible in a steel according to the invention, since P causes a strong hardening of the structure after cooling from the case hardening heat in the case of the surface layer hardening. To prevent this, the P content of the steel according to the invention is limited to at most 0.015% by weight, in particular less than 0.015% by weight.
  • the sulfur (“S”) content of a steel according to the invention should also be set as low as possible, since S reduces the ductility or toughness of the structure. To prevent this, the S content of the Steel according to the invention is limited to at most 0.015% by weight, in particular less than 0.015% by weight.
  • the chromium (“Cr”) content in the steel according to the invention is limited to a maximum of 1.0% by weight in order to ensure a low residual austenite content in the hardened outer layer after hardening the outer layer. This effect can be achieved particularly reliably if the Cr content of the steel is limited to at most 0.6% by weight, in particular 0.5% by weight.
  • the loss of hardenability of the steel to be expected as a result of the low Cr content is compensated for in the steel according to the invention by adjusting the contents of the other alloying elements.
  • at least 0.2% by weight, in particular at least 0.3% by weight or at least 0.4% by weight, of Cr is provided in the steel in order to make use of the contribution to hardness that Cr can make.
  • Nickel in the contents of 0.7-2.0% by weight provided according to the invention contributes to increasing the hardenability and increasing the ductility or toughness.
  • a martensitic structure with a slight distortion of the hardening structure is sometimes achieved in the steels according to the invention.
  • the Ni contents like the Mn contents, must be within certain limits, since Ni and Mn shift the transition points to lower temperatures.
  • the martensite start temperature can be adjusted according to that of Dr. Helmut Brandis in Thyssen Brass -Technischeberichte 1, volume 1975, issue 1, page 8 -10, specified formula. In the case of steel according to the invention, it is approximately 440 ° C.
  • Steel according to the invention is particularly suitable for the components which, after cooling from the heat of hardening, are not subjected to stress relief annealing.
  • the Ni content By increasing the Ni content to at least 0.9% by weight, in particular at least 1.5% by weight, the advantageous effects of Ni can be used particularly safely.
  • Molybdenum hardly changes the transition temperatures, but increases the conversion to the bainite stage after cooling from the heat of the heat treatment carried out for surface hardening.
  • a fine-grained hardening structure made of bainite increases ductility and toughness in the
  • Molybdenum also improves the wear behavior of the hardened surface layer.
  • the positive effects of Mo on the steel according to the invention can be exploited by Mo contents of at least 0.5% by weight. In contrast, negative influences of the presence of Mo in the steel according to the invention are excluded by the fact that the Mo content is at most 1.0% by weight,
  • N Nitrogen
  • the N content of a steel according to the invention is therefore limited to at most 0.015% by weight, in particular at most 0.010% by weight.
  • the N content can be achieved by alloying
  • Micro alloy elements such as Al and Ti are bound.
  • Aluminum (“AI") is used in steel production for deoxidation.
  • Al contents of 0.010-0.060% by weight, in particular at least 0.015% by weight or at most 0.040% by weight, are required and can simultaneously be used to set excess nitrogen and to increase the fine grain size.
  • Copper is an undesirable accompanying element that occurs in the
  • the Cu content is limited to a maximum of 0.20% by weight.
  • the boron (“B”) content optionally provided according to the invention also serves to increase the hardenability.
  • the N content must be as low as possible and the nitrogen present in the steel must be bound by aluminum or other elements, such as, for example, the optionally added titanium, niobium or vanadium.
  • the positive influences of B can be used particularly safely if the B content is at least 0.001% by weight, in particular at least 0.002% by weight.
  • the B content is limited to a maximum of 0.005% by weight in order to prevent the formation of boron-containing precipitates
  • Toughness of a component formed from a steel according to the invention is of great importance, elements such as niobium (“Nb”), tantalum (“Ta”), vanadium (“V”), titanium (“Ti”) or tungsten (“W. ”) - alone or in combination. If a particularly fine-grained structure is to be secured, at least one of the elements W, Ti, Nb, Ta or V is accordingly present in the steel according to the invention in accordance with the invention, a combination of those in Elements W, Nb and V added according to the invention have proven to be particularly practical.
  • the optionally added Nb contents are 0.015-0.05% by weight, in particular 0.015-0.03% by weight.
  • the optionally added Ti contents are 0.01-0.04% by weight, in particular 0.015-0.035% by weight.
  • V contents are 0.04-0.12% by weight, in particular 0.05-0.12% by weight or 0.08-0.12% by weight.
  • Nb and V are added at the same time, their contents are optimally 0.015-0.03% by weight of Nb and 0.08-0.12% by weight of V in order to use the combined effect of their presence particularly effectively.
  • the optionally added contents of Ta are 0.01-0.04 weight percent.
  • the optionally added W contents can be 0.15-0.65% by weight, in particular 0.15-0.35% by weight.
  • the addition of W not only has a refining effect, but also a higher wear resistance and a greater hardening depth after carburizing.
  • Carburizing processes such as those mentioned above are particularly suitable for the surface hardening of a steel according to the invention
  • Leaflet 452 are explained.
  • the steel according to the invention can be used in particular for the production of case-hardened gear parts and other case-hardened parts
  • Components e.g. of high-strength, weldable round steel chains. No subsequent stress relief annealing is required to ensure the required ductility of the material in the respective component.
  • Steel according to the invention is particularly suitable for the production of case-hardened components which require a high surface hardness and high ductility in the core area of the components. Examples of this are the already mentioned round steel chains and their individual parts, if these are particularly suitable for use as conveyor chains in cement production, in mining or in the processing of coal, especially in the case of
  • Nitrocarburizing can be produced from the steel according to the invention, with no relaxation annealing after the
  • the invention is particularly suitable for the production of heavy
  • Highly wear-resistant and resilient drive chains for vehicles, in particular motor vehicles, for motorcycles and bicycles can also be produced from steel according to the invention.
  • the surface hardness of the steel can be brought to values of more than 820 HV1 by cooling the component formed from the steel according to the invention and hardened by case hardening in oil or helium after hardening.
  • the core structure consisting of bainite and martensite such a surface layer hardened from existing steel sample rod with a
  • Diameters of up to 45 mm typically have a hardness of 200-350 HV in this case.
  • the hardening depth for bars up to 45 mm in diameter is 0.30 - 0.45 mm.
  • a steel according to the invention has a hardness of over 820 HV1, for example, in the carburized surface layer without subsequent relaxation. With a hardening depth of 0.12% of the diameter of the particular rod-shaped component, there is still a hardness of at least 550 HV.
  • chain links formed from steel according to the invention which are surface hardened by case hardening and have been cooled in oil or helium after surface hardening in a vacuum, a breaking stress of at least 440 MPa can be achieved in a chain test carried out in accordance with DIN 22252.
  • a steel according to the invention after blind hardening, i.e. case hardening, in which the steel is heated to the hardening temperature without carburizing, one determined according to the standard DIN EN ISO 148-1
  • the rod After direct case hardening at 950 ° C followed by cooling in oil, the rod has a fine-grained structure of at least ASTM 6 in the case-hardened surface layer with a surface hardness of 840 HV1.
  • a hardness of 30HRc is achieved in the core of the sample, whereas a hardness of 560 HV is present at a hardening depth of 0.38 mm.
  • composition of the steel examined here ensures such high ductility of the material that it is not necessary to subsequently relax it to adjust the mechanical properties. This results in impact energy values with an ISO-V notch of 110 to 130 joules for the steel bars examined.
  • the steel according to the invention achieves a tensile strength of 985 MPa determined in accordance with DIN EN ISO 17022-3 in the “blind-hardened state” (ie hardening of 950 ° C. with subsequent cooling in oil, no carburization). These determined properties make the steel according to the invention particularly suitable for the production of round steel chains, the one

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

Abstract

L'invention concerne un acier qui, lors de la trempe des couches superficielles sans recuit de détente ultérieur, a non seulement le potentiel de développer une couche superficielle durcie ayant une dureté superficielle élevée, en particulier supérieure à 820 HV1, mais possède aussi une structure de base à grains fins résistante et se laisse en même temps bien souder. Un acier selon l'invention se compose de (en % en poids) C : 0,10 - 0,19 %, Si : ≤ 0,15 %, Mn : ≤ 1,0 %, P : ≤ 0,015 %, S : ≤ 0,015 %, Cr : 0,2 - 1,0 %, Ni : 0,7 - 2,0 %, Mo : 0,5 - 1,0 %, N : ≤ 0,015 %, AI : 0,010 - 0,060 %, Cu : ≤ 0,20 %, B : ≤ 0,005 %, ainsi que respectivement en option un ou plusieurs éléments du groupe « W, Ti, Nb, V, Ta » dans des teneurs conformes aux conditions suivantes W : 0,15 - 0,65 %, Ti : 0,01 - 0,04 %, Nb : 0,015 - 0,05 %, Ta : 0,01 - 0,04 %, V : 0,04 - 0,12 %, et le reste étant du fer et les impuretés inévitables.
EP19773026.0A 2018-09-18 2019-09-17 Acier pour le durcissement de surface ayant une dureté superficielle élevée et une structure de base ductile fine Pending EP3853389A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018122858 2018-09-18
PCT/EP2019/074872 WO2020058269A1 (fr) 2018-09-18 2019-09-17 Acier pour le durcissement de surface ayant une dureté superficielle élevée et une structure de base ductile fine

Publications (1)

Publication Number Publication Date
EP3853389A1 true EP3853389A1 (fr) 2021-07-28

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19773026.0A Pending EP3853389A1 (fr) 2018-09-18 2019-09-17 Acier pour le durcissement de surface ayant une dureté superficielle élevée et une structure de base ductile fine

Country Status (4)

Country Link
US (1) US20220074034A1 (fr)
EP (1) EP3853389A1 (fr)
CN (1) CN112714799A (fr)
WO (1) WO2020058269A1 (fr)

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CN115704074B (zh) * 2021-08-11 2024-01-09 宝山钢铁股份有限公司 一种矿用链条钢、链条及其制造方法
CN115725894B (zh) * 2021-08-25 2023-12-12 宝山钢铁股份有限公司 一种具有优良冲击性能的高温渗碳NiMo系齿轮钢及其制造方法
CN114645182B (zh) * 2022-03-23 2022-10-14 承德建龙特殊钢有限公司 一种齿轮钢及其制备方法与应用

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