WO2020178854A2 - Acier pour carburation à haute température et son procédé de préparation - Google Patents

Acier pour carburation à haute température et son procédé de préparation Download PDF

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Publication number
WO2020178854A2
WO2020178854A2 PCT/IN2020/050195 IN2020050195W WO2020178854A2 WO 2020178854 A2 WO2020178854 A2 WO 2020178854A2 IN 2020050195 W IN2020050195 W IN 2020050195W WO 2020178854 A2 WO2020178854 A2 WO 2020178854A2
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WIPO (PCT)
Prior art keywords
steel
composition
niobium
titanium
carburizing
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.)
Ceased
Application number
PCT/IN2020/050195
Other languages
English (en)
Other versions
WO2020178854A3 (fr
Inventor
Kalyani BABASAHEB
Rajkumar SINGH
Vinayak PAWAR
Satish SHINDE
Omkar TIKHE
Ravindra NAGARKAR
Subhashis Banerjee
Anant ANDHALE
Mandar BIDAWE
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.)
Kalyani Technoforge Ltd
Bharat Forge Ltd
Original Assignee
Kalyani Technoforge Ltd
Bharat Forge 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 Kalyani Technoforge Ltd, Bharat Forge Ltd filed Critical Kalyani Technoforge Ltd
Publication of WO2020178854A2 publication Critical patent/WO2020178854A2/fr
Publication of WO2020178854A3 publication Critical patent/WO2020178854A3/fr
Anticipated expiration legal-status Critical
Ceased 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
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • 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
    • 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
    • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • C21D1/76—Adjusting the composition of the atmosphere
    • 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
    • C21D9/28—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for plain shafts
    • 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
    • C21D9/32—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for gear wheels, worm wheels, or the like
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium 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
    • C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium 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
    • C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium 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
    • C23C8/02—Pretreatment of the material to be coated
    • 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
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/001—Austenite
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/002—Bainite
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/008—Martensite

Definitions

  • the present invention relates to a steel composition.
  • the present invention relates to a steel composition or steel for high temperature carburizing and its method of preparation.
  • Carburizing is a case hardening heat treatment process in which metal (Steel/Iron) is heated in the presence of a carbon-bearing material, such as charcoal or carbon monoxide, leading to diffusion of the element“Carbon” through the surface of the metal.
  • a carbon-bearing material such as charcoal or carbon monoxide
  • the Steel/Iron has higher solubility of Carbon in the austenite phase.
  • the carburizing treatment is carried out in the temperature range where the metal is in austenite phase which increases the diffusion of Carbon. Due to this diffusion of Carbon, the surface and sub-surface layers of the metal become rich in Carbon.
  • the metal is cooled rapidly in a quenching medium, which results in hardening of the outer surfaces with high carbon content.
  • Carburizing process is controlled by different parameters such as carbon potential, carburizing time and temperature. Depending on the amount of time and temperature, the affected area can vary in carbon content. Longer carburizing times and higher temperatures typically increase the depth of carbon diffusion.
  • the case formed on the metal surface during carburizing increases the hardness of the surface.
  • This hard surface with a tough core helps in increasing the wear resistance of the metal.
  • engineers have been trying to increase the case depth of carburizing process by increasing the diffusion of Carbon during the process. This can be achieved either through increasing the carburizing temperature or the carburizing time. Increase in the carburizing time leads to lower productivity and hence, is avoided. Use of higher temperature may accelerate the diffusion process and hence, can reduce the cycle time.
  • the carburizing process is done in the temperature range where the metal is in an austenite phase, the metal has the tendency of grain coarsening during the process.
  • One way of retarding the grain coarsening is to modify the chemistry of material which may resist the grain coarsening process.
  • the present invention provides a steel composition for high temperature carburizing comprising: a) 0.11 to 0.3 wt. % of Carbon, b) 1.1 to 1.4 wt. % of Manganese, c) 0.15 to 0.35 wt. % of Silicon, d) 1 to 1.3 wt. % of Chromium, e) ⁇ 0.0006 wt. % of Boron, f) 0.04 to 0.05 wt. % of Titanium, g) 0.035 to 0.056 wt. % of Niobium, h) ⁇ 0.2 wt. % of Nickel, i) ⁇ 0.06 wt.
  • the weight ratio of Titanium to Niobium is in the range of 1: 0.7 to 1: 1.4.
  • the weight ratio of Titanium to Niobium is 1:0.92.
  • the weight ratio of Titanium to Niobium is 1:1.11.
  • the composition comprises: 0.205 wt.% of Carbon, 1.251wt. % of Manganese, 0.269 wt. % of Silicon, 1.195 wt. % of Chromium, 0.0001 wt. % of Boron, 0.0435 wt. % of Titanium, 0.0465 wt. % of Niobium, 0.039 wt. % of Nickel, 0.018 wt. % of Molybdenum, 0.019 wt.% of Sulphur, 0.011 wt.% of Phosphorous, 0.02 wt. % of Aluminium, 77 ppm of Nitrogen and the rest is Iron (Fe).
  • the composition comprises: 0.2 wt. % of Carbon, 1.296 wt. % of Manganese, 0.249 wt. % of Silicon, 1.252 wt. % of Chromium, 0.0006 wt. % of Boron, 0.0404 wt. % of Titanium, 0.0373 wt. % of Niobium, 0.039 wt. % of Nickel, 0.029 wt. % of Molybdenum, 0.019 wt.% of Sulphur, 0.021 wt.% of Phosphorous, 0.015 wt. % of Aluminium, 159 ppm of Nitrogen and the rest is Iron (Fe).
  • the composition comprises 0.197 wt.% of Carbon, 1.129 wt. % of Manganese, 0.17wt. % of Silicon, 1.231 wt. % of Chromium, 0.0004 wt. % of Boron, 0.0503 wt. % of Titanium, 0.0556 wt. % of Niobium, 0.039 wt. % of Nickel, 0.031 wt. % of Molybdenum, 0.017 wt.% of Sulphur, 0.021 wt.% of Phosphorous, 0.027 wt. % of Aluminium, 183 ppm of Nitrogen and the rest is Iron (Fe).
  • the article is selected from shafts and gears.
  • the steel article made from the steel composition is characterized by one or more following features:- a fine grain structure with ASTM grain size ranging from 7.5 to 9; - effective case depth: 0.8-1 mm; - retained austenite: 12.5 to 13.1%;- tempered Martensite at surface and
  • a process for manufacturing the steel or steel part comprising the following steps: a. providing a steel composition comprising a) 0.11 to 0.3 wt.% of Carbon, b) 1.1 to 1.4 wt. % of Manganese, c) 0.15 to 0.35 wt. % of Silicon, d) 1 to 1.3 wt. % of Chromium, e) ⁇ 0.0006 wt. % of Boron, f) 0.04 to 0.05 wt. % of Titanium, g) 0.035 to 0.056 wt. % of Niobium, h) ⁇ 0.2 wt.
  • the present invention is focused on reducing the carburizing cycle time for steel or a steel part. This is achieved through accelerating carbon diffusion by providing additional thermal energy i.e. increasing carburizing temperature. In this high temperature carburizing, the diffusion of carbon is increased but, this causes formation of abnormal/coarse grains which deteriorates mechanical properties of the carburized part.
  • the present invention attempts to avoid abnormal grain growth which typically occurs due to fast grain boundary movement at a high temperature.
  • the present invention provides a solution to eliminate abnormal grain growth and thereby prevents deterioration of mechanical properties of the carburized part.
  • the present invention provides a steel composition containing a specific combination of alloying elements.
  • the alloying elements and their weight percentage are chosen such that, precipitates of these elements have the potential of pinning the austenite grain boundary as these precipitates do not dissolve at the carburizing temperature.
  • the steel composition for high temperature carburizing comprises: 0.11 to 0.3 wt.% of Carbon, 1.1 to 1.4 wt. % of Manganese, 0.15 to 0.35wt. % of Silicon, 1 to 1.3 wt. % of Chromium, ⁇ 0.0006 wt. % of Boron, 0.04 to 0.05 wt. % of Titanium, 0.035 to 0.056 wt. % of Niobium, ⁇ 0.2 wt. % of Nickel, ⁇ 0.06 wt.
  • Titanium to Niobium ratio is in the range ofl: 0.7 to 1: 1.4.
  • the ratio of Titanium to Niobium is 1:0.92.
  • the ratio of Titanium to Niobium is 1: 1.11.
  • the steel composition for high temperature carburizing comprises: 0.11 to 0.3 wt.% of Carbon, 1.1 to 1.4 wt. % of Manganese, 0.15 to 0.35wt. % of Silicon, 1 to 1.3 wt. % of Chromium, ⁇ 0.0006 wt. % of Boron, 0.04 to 0.05 wt. % of Titanium, 0.035 to 0.056 wt. % of Niobium, ⁇ 0.2 wt. % of Nickel, ⁇ 0.06 wt.
  • the steel composition for high temperature carburizing comprises: 0.11 to 0.3 wt.% of Carbon, 1.1 to 1.4 wt. % of Manganese, 0.15 to 0.35wt. % of Silicon, 1 to 1.3 wt. % of Chromium, ⁇ 0.0006 wt.
  • the steel composition for high temperature carburizing comprises: 0.205 wt.% of Carbon, 1.251wt. % of Manganese, 0.269wt. % of Silicon, 1.195 wt. % of Chromium, 0.0001 wt. % of Boron, 0.0435 wt. % of Titanium, 0.0465 wt. % of Niobium, 0.039 wt. % of Nickel, 0.018 wt. % of Molybdenum, 0.019 wt.% of Sulphur, 0.011 wt.% of Phosphorous, 0.02 wt. % of Aluminium, 77 ppm of Nitrogen and the rest is Iron (Fe).
  • the steel composition for high temperature carburizing comprises: 0.2 wt.% of Carbon, 1.296 wt. % of Manganese, 0.249wt. % of Silicon, 1.252 wt. % of Chromium, 0.0006 wt. % of Boron, 0.0404 wt. % of Titanium, 0.0373 wt. % of Niobium, 0.039 wt. % of Nickel, 0.029 wt. % of Molybdenum, 0.019 wt.% of Sulphur, 0.021 wt.% of Phosphorous, 0.015 wt. % of Aluminium, 159 ppm of Nitrogen and the rest is Iron (Fe).
  • the steel composition for high temperature carburizing comprises: 0.197 wt.% of Carbon, 1.129 wt. % of Manganese, 0.17wt. % of Silicon, 1.231 wt. % of Chromium, 0.0004 wt. % of Boron, 0.0503 wt. % of Titanium, 0.0556 wt. % of Niobium, 0.039 wt. % of Nickel, 0.031 wt. % of Molybdenum, 0.017 wt.% of Sulphur, 0.021 wt.% of Phosphorous, 0.027 wt. % of Aluminium, 183 ppm of Nitrogen and the rest is Iron (Fe).
  • the present invention also provides steel articles made from the steel composition of the present invention.
  • the articles include but are not limited to shafts, gears and the like.
  • the present invention also provides a process for manufacturing the steel or steel part by forging and carburizing the steel composition described herein above.
  • carburizing is carried out in the range from900 to 1050°C. In one embodiment, carburizing is carried out at about 1020 °C.
  • a process for manufacturing the steel or steel part comprising the following steps: a. providing a steel composition comprising a) 0.11 to 0.3 wt.% of Carbon, b) 1.1 to 1.4 wt. % of Manganese, c) 0.15 to 0.35 wt. % of Silicon, d) 1 to 1.3 wt. % of Chromium, e) ⁇ 0.0006 wt. % of Boron, f) 0.04 to 0.05 wt. % of Titanium, g) 0.035 to 0.056 wt. % of Niobium, h) ⁇ 0.2 wt.
  • the forging comprises hot forging or cold forging.
  • the steel article/part made using the steel composition of present invention and process of the present invention exhibits improved mechanical strength with no abnormal grain growth.
  • Effective case depth 1.0 mm

Landscapes

  • 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)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)

Abstract

La présente invention concerne une composition d'acier pour carburation à haute température et un article en acier fabriqué à partir de la composition d'acier. La composition comprend : a) de 0,11 à 0,3 % en poids de carbone, b) de 1,1 à 1,4 % en poids de manganèse, c) de 0,15 à 0,35 % en poids de silicium, d) de 1 à 1,3 % en poids de chrome, e) ≤ 0,0006 % en poids de bore, f) de 0,04 à 0,05 % en poids de titane, g) de 0,035 à 0,056 % en poids de niobium, h) < 0,2 en poids de nickel, i) <0.06 % en poids de molybdène, j) < 0,025 % en poids de soufre, K) < 0,025 % en poids de phosphore, l) de 0,02 à 0,03 % en poids d'aluminium, m) ≤ 190 ppm d'azote, et n) le reste étant du fer (Fe).
PCT/IN2020/050195 2019-03-04 2020-03-03 Acier pour carburation à haute température et son procédé de préparation Ceased WO2020178854A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN201921008369 2019-03-04
IN201921008369 2019-03-04

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WO2020178854A2 true WO2020178854A2 (fr) 2020-09-10
WO2020178854A3 WO2020178854A3 (fr) 2020-10-15

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024003593A1 (fr) 2022-06-28 2024-01-04 Arcelormittal Pièce forgée en acier et son procédé de fabrication
US20240084432A1 (en) * 2021-07-07 2024-03-14 Jiangsu University Method for heat-treating boron steel, and boron steel with high strength and good toughness, and use thereof
WO2025125864A1 (fr) 2023-12-12 2025-06-19 Arcelormittal Pièce forgée en acier et son procédé de fabrication
WO2025125865A1 (fr) 2023-12-12 2025-06-19 Arcelormittal Pièce forgée en acier et son procédé de fabrication

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1167561A3 (fr) * 2000-06-28 2009-03-04 Mitsubishi Steel Muroran Inc. Acier pour cémentation et carbonitruration
CN108823501A (zh) * 2018-08-07 2018-11-16 湖北威能达传动有限责任公司 一种20CrMnMoA钢锥齿轮轴的热处理工艺

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20240084432A1 (en) * 2021-07-07 2024-03-14 Jiangsu University Method for heat-treating boron steel, and boron steel with high strength and good toughness, and use thereof
WO2024003593A1 (fr) 2022-06-28 2024-01-04 Arcelormittal Pièce forgée en acier et son procédé de fabrication
JP2025523377A (ja) * 2022-06-28 2025-07-23 アルセロールミタル 鋼の鍛造部品及びその製造方法
WO2025125864A1 (fr) 2023-12-12 2025-06-19 Arcelormittal Pièce forgée en acier et son procédé de fabrication
WO2025125865A1 (fr) 2023-12-12 2025-06-19 Arcelormittal Pièce forgée en acier et son procédé de fabrication

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