WO2024051758A1 - Procédé de préparation d'acier 50crva pour chaîne de transmission de moteur - Google Patents

Procédé de préparation d'acier 50crva pour chaîne de transmission de moteur Download PDF

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Publication number
WO2024051758A1
WO2024051758A1 PCT/CN2023/117357 CN2023117357W WO2024051758A1 WO 2024051758 A1 WO2024051758 A1 WO 2024051758A1 CN 2023117357 W CN2023117357 W CN 2023117357W WO 2024051758 A1 WO2024051758 A1 WO 2024051758A1
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Prior art keywords
steel
rolling
50crva
preparing
engine transmission
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PCT/CN2023/117357
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English (en)
Chinese (zh)
Inventor
徐晓春
王攀峰
马兆红
韩菱
韩玉梅
丁世磊
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南京钢铁股份有限公司
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Publication of WO2024051758A1 publication Critical patent/WO2024051758A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B22D11/114—Treating the molten metal by using agitating or vibrating means
    • B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/072—Treatment with gases
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/10—Handling in a vacuum
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • 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
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Definitions

  • the present invention relates to a method for preparing hot-rolled steel strips for automobiles, and in particular to a method for preparing 50CrVA steel for engine transmission chains.
  • Automotive engine chains can be divided into timing chains, oil pump chains, high-pressure pump chains, common rail pump chains, balance shaft chains, etc. according to their uses; according to their structures, they can be divided into roller chains, bushing chains, and toothed chains; according to their row numbers It can be divided into: single-row chain, double-row chain, multi-row chain; according to the meshing mechanism, the toothed chain can be divided into internal meshing, external meshing, internal-external composite meshing toothed chain and variable pitch Hy-Vo chain, etc.
  • the steel 50CrVA used in the engine transmission chain is a medium carbon steel.
  • it is difficult to control the oxygen content of the molten steel during tapping which makes the yield of alloy elements during deoxidation and alloying of the tapping unstable.
  • the composition of the molten steel entering the LF refining process The large fluctuations increase the difficulty of adjusting LF refining according to the target composition of the molten steel.
  • the initial oxygen content of the molten steel is high, and the inclusion content of the initial molten steel is also high.
  • 50CrVA alloy structural steel is prone to decarburization during the heating process of the billet.
  • the present invention aims to provide a transmission chain steel 50CrVA with stable chemical composition, low non-metallic inclusion content in the steel, fine and uniform structure, and less surface decarburization layer, so as to improve the service life of the engine transmission chain.
  • the preparation method of 50CrVA steel for engine transmission chain according to the present invention includes the following steps:
  • VD vacuum treatment vacuum degree ⁇ 1mbar, processing time more than 10 minutes, after breaking the vacuum, feed pure calcium rod cored wire 50-100m, soft blowing Ar time more than 15 minutes;
  • a three-stage continuous push-steel heating furnace is used to heat billets and rectangular billets;
  • the initial composition of the molten steel reaches 70% to the lower limit of the target composition. 90%.
  • the initial composition of the molten steel reaches 80% to 85% of the lower limit of the target composition.
  • the target components of molten steel are calculated in terms of weight percentage: C: 0.50% ⁇ 0.54%, Si: 0.18% ⁇ 0.30%, Mn: 0.70% ⁇ 0.80%, P ⁇ 0.015%, S ⁇ 0.010%, Cr: 0.95 %-1.10%, Ni ⁇ 0.20%, Cu ⁇ 0.20%, Ti ⁇ 0.20%, Alt: 0.020% ⁇ 0.050%, V: 0.12%-0.20%, the rest are iron and trace elements.
  • the LF refining in step (2) is fine-tuned according to the target composition of the molten steel.
  • the alloy added in step (2) is high carbon ferromanganese alloy, silicon manganese alloy and fervanadium alloy.
  • the carburizing agent added in step (2) is high-purity graphite carbon material.
  • the deoxidizer added in step (2) is high-purity silicon carbide.
  • the refining time in step (2) is 40 to 70 minutes, and the white residue holding time is 30 to 50 minutes.
  • step (4) the long nozzle Ar is sealed for full protection casting, and the tundish is blown with Ar before the big ladle is poured; medium carbon steel molding slag is used, the superheat of the tundish is 10-30°C, and the 150*150mm continuous casting
  • the casting speed is 2.0-2.2m/min
  • the casting speed of 150*220mm is 1.3-1.5m/min
  • the crystallizer and terminal electromagnetic stirring are adopted, the crystallizer liquid level is automatically controlled, and the liquid level fluctuation is ⁇ 6mm.
  • the heating atmosphere in step (5) is a reducing atmosphere, and the residual oxygen content of the flue gas is controlled to be ⁇ 3%.
  • the heating process adopts slow burning at low temperature and fast burning at high temperature under a reducing atmosphere, and the residual oxygen content of the flue gas is controlled to ⁇ 3% to reduce decarburization on the surface of the cast slab.
  • step (6) reciprocating multi-pass rolling is used for rough rolling, with an opening rolling temperature of 1030-1140°C; for mid-finishing rolling, the opening temperature is 960-1030°C, and the thickness tolerance is controlled by the AGC system to be less than 0.05mm; The rolling temperature is 890 ⁇ 950°C.
  • step (1) of the present invention a deoxidizing furnace protective agent is added at the end of the smelting process of the electric furnace to reduce the oxygen content of the molten steel, and an eccentric furnace bottom tapping operation is adopted to retain steel and slag, which greatly reduces the amount of slag and greatly reduces the oxidation of the molten steel, which not only improves the The yield of alloying elements reduces the amount of carburizing agent, reduces production costs, reduces the content of inclusions in steel, and improves the purity of molten steel; in step (2), LF refining uses ferrosilicon manganese, high carbon ferrochrome, ferrovanadium alloys and high Pure graphite carbon material is used for alloying of molten steel, high-purity silicon carbide is used for diffusion deoxidation, lime and fluorite slag systems are used to achieve the effect of rapid desulfurization of molten steel, and foamed slag is produced to realize slag submerged arc operation to reduce the amount of N absorbed
  • step (4) the continuous casting process adopts billet and rectangular billet continuous casting, and uses a five-machine and five-stream billet continuous casting machine for constant casting speed to reduce the fluctuation of the crystallizer liquid level and promote the effective floating of inclusions, thereby Improve the purity of cast steel billet.
  • the significant advantages of the present invention are: 1.
  • the non-metallic inclusion content of the finished steel strip produced by the present invention is lower than 0.5 levels, the chemical composition has small fluctuations, and the performance of different batches of materials is stable; 2.
  • the finished steel strip produced by the present invention has less surface decarburization, a fine and uniform structure, a grain size of 7.0, good toughness, and a long service life of the engine transmission chain.
  • a method for preparing 50CrVA steel for engine transmission chains which sequentially includes electric furnace smelting, LF refining, VD vacuum treatment, continuous casting, heating, descaling, rolling, cooling and coiling. The specific steps are as follows:
  • (1) Electric furnace smelting 45 tons of scrap steel and 65 tons of molten iron are added to the electric furnace. During the smelting process, 7040kg of active lime is added, and the oxygen supply is controlled to 5200m3. At the end of the smelting, 260kg of deoxidizing furnace protective agent is added, and the stay is 1 minute, and then passes through the eccentric furnace bottom
  • control the C content in the molten steel to 0.11%, the P content to 0.009%, and the oxygen content of the molten steel to 270 ppm
  • 240kg of modified refining slag 110kg of aluminum pellets, 650kg of lime, and the initial composition of molten steel reaches 80% of the lower limit of the target composition.
  • (2) LF refining Add 75kg of fervanadium, 160kg of silicon-manganese, 550kg of high-carbon ferrochromium alloy, and 180kg of high-purity graphite carbon material into the LF refining furnace for alloying of molten steel. Add 80kg of high-purity silicon carbide in small quantities and in batches for diffusion deoxidation.
  • the target components of the molten steel are calculated in terms of weight percentage: C: 0.51%, Si: 0.22%, Mn: 0.72%, P: 0.010%, S: 0.002%, Cr: 1.03%, Ni: 0.03%, Cu: 0.06%, Alt: 0.038%, Ti0.004%, V0.13%, the rest is iron and trace elements.
  • VD vacuum treatment After the composition and temperature of the molten steel refined by LF are qualified, VD vacuum degassing is carried out, the vacuum degree is 0.48mbar, the processing time is 19 minutes, after the vacuum is broken, the covering agent is added, soft blowing of argon gas is performed for 39 minutes, and static stirring is carried out. During this time, the slag surface moves slightly and is not exposed to light to ensure that inclusions are fully floated and removed.
  • the specific water content is 0.60L/kg, the electromagnetic stirring frequency of the crystallizer is 3.00Hz, the current is 300A; the terminal electromagnetic stirring frequency is 8Hz, the current is 350A; the center segregation, center shrinkage cavity and center porosity of the slab are all lower than level 1.0.
  • Implementing constant pulling speed casting can avoid slag entrainment, and at the same time, non-metallic inclusions can fully collide, grow, float and be removed.
  • Heating Put the 150mm ⁇ 220mm small rectangular billet into a three-stage continuous push steel heating furnace and heat it in a reducing atmosphere.
  • the residual oxygen content of the flue gas is 2.2%.
  • the temperature of the heating section of the heating furnace is controlled at 1130°C
  • the temperature of the soaking section is controlled at 1080°C
  • the temperature difference across the billet section is less than 30°C.
  • the opening temperature of mid-finish rolling is 995°C;
  • the final rolling temperature is controlled by controlling the final rolling speed, the final rolling temperature is 880°C, the final rolling speed is 6m/s, and then it is twisted, snake-shaped oscillated and transported to the flat chain for transportation and cooling.
  • Cooling and coiling Air-cool the rolled steel strip, check the surface quality and dimensional tolerance, coil, pack and put it into storage.
  • the coiling temperature is 690°C.
  • a method for preparing 50CrVA steel for engine transmission chains which sequentially includes electric furnace smelting, LF refining, VD vacuum treatment, continuous casting, heating, descaling, rolling, cooling and coiling. The specific steps are as follows:
  • (1) Electric furnace smelting 43 tons of scrap steel and 65 tons of molten iron are added to the electric furnace. During the smelting process, 6520kg of active lime is added, and the oxygen supply is controlled to 5100m3. At the end of the smelting, 250kg of deoxidizing furnace protective agent is added, and the stay is 1 minute, and then passes through the eccentric furnace bottom When tapping steel, control the C content in the molten steel to 0.09%, the P content to 0.007%, and the oxygen content of the molten steel to 285ppm; during the tapping process of the electric furnace, add 200kg of ferrovanadium, 600kg of silicon manganese, 245kg of high carbon ferromanganese, and 1,400kg of high carbon ferrochrome. , 250kg of modified refining slag, 120kg of aluminum pellets, 650kg of lime, and the initial composition of molten steel reaches 85% of the lower limit of the target composition.
  • (2) LF refining Add 75kg of fervanadium, 130kg of silicon-manganese, 500kg of high-carbon ferrochromium alloy, and 140kg of high-purity graphite carbon material into the LF refining furnace for alloying of molten steel. Add 80kg of high-purity silicon carbide in small quantities and in batches for diffusion deoxidation.
  • the target components of the molten steel are calculated in terms of weight percentage: C: 0.51%, Si: 0.23%, Mn: 0.73%, P: 0.010%, S: 0.002%, Cr: 1.01%, Ni: 0.02%, Cu: 0.06%, Alt: 0.030%, Ti0.005%, V0.13%, the rest is iron and trace elements.
  • VD vacuum treatment After the composition and temperature of the molten steel refined by LF are qualified, VD vacuum degassing is carried out, the vacuum degree is 0.71mbar, the processing time is 19 minutes, after the vacuum is broken, increase the covering agent, blow argon softly and stir for 24 minutes, and stir quietly When the slag surface moves slightly, no light can be seen.
  • the specific water content is 0.60L/kg, the electromagnetic stirring frequency of the crystallizer is 3.00Hz, the current is 300A; the terminal electromagnetic stirring frequency is 8Hz, the current is 350A; the center segregation, center shrinkage cavity and center porosity of the slab are all lower than level 1.0.
  • Implementing constant pulling speed casting can avoid slag entrainment, and at the same time, non-metallic inclusions can fully collide, grow, float and be removed.
  • Heating Put the 150mm ⁇ 220mm small rectangular billet into a three-stage continuous push steel heating furnace and heat it in a reducing atmosphere.
  • the residual oxygen content of the flue gas is 2.1%.
  • the temperature of the heating section of the heating furnace is controlled at 1125°C
  • the temperature of the soaking section is controlled at 1087°C
  • the temperature difference across the billet section is less than 30°C.
  • the opening temperature of intermediate finishing rolling is 985°C; the final rolling temperature is controlled by controlling the final rolling speed, the final rolling temperature is 886°C, the final rolling speed is 6m/s, and then it is twisted, snake-shaped oscillated, flat chain transported and cooled.
  • Cooling and coiling Air-cool the rolled steel strip, check the surface quality and dimensional tolerance, coil, pack and put it into storage.
  • the coiling temperature is 675°C.
  • a method for preparing 50CrVA steel for engine transmission chains which sequentially includes electric furnace smelting, LF refining, VD vacuum treatment, continuous casting, heating, descaling, rolling, cooling and coiling. The specific steps are as follows:
  • (1) Electric furnace smelting 42 tons of scrap steel and 66 tons of molten iron are added to the electric furnace. During the smelting process, 6850kg of active lime is added, and the oxygen supply is controlled to 4950m3. At the end of the smelting, 260kg of deoxidizing furnace protective agent is added, and the stay is 1 minute, and then passes through the eccentric furnace bottom
  • control the C content in the molten steel to 0.08%, the P content to 0.007%, and the oxygen content of the molten steel to 277 ppm
  • 240kg of modified refining slag 110kg of aluminum pellets, 600kg of lime, and the initial composition of molten steel reaches 80% of the lower limit of the target composition.
  • (2) LF refining Add 75kg of fervanadium, 145kg of silicon-manganese, 530kg of high-carbon ferrochromium alloy, and 150kg of high-purity graphite carbon material into the LF refining furnace for alloying of molten steel, and add 80kg of high-purity silicon carbide in small quantities and in batches for diffusion deoxidation.
  • the target components of the molten steel are calculated in terms of weight percentage: C: 0.51%, Si: 0.25%, Mn: 0.75%, P: 0.008%, S: 0.002%, Cr: 1.02%, Ni: 0.02%, Cu: 0.05%, Alt: 0.036%, Ti0.005%, V0.14%, the rest is iron and trace elements.
  • VD vacuum treatment After the composition and temperature of the molten steel refined by LF are qualified, VD vacuum degassing is carried out, the vacuum degree is 0.60mbar, the processing time is 21 minutes, after the vacuum is broken, the covering agent is increased, soft blowing of argon gas is performed for 37 minutes, and static stirring is carried out When the slag surface moves slightly, no light can be seen.
  • the specific water content is 0.60L/kg, the electromagnetic stirring frequency of the crystallizer is 3.00Hz, the current is 300A; the terminal electromagnetic stirring frequency is 8Hz, the current is 350A; the center segregation, center shrinkage cavity and center porosity of the slab are all lower than level 1.0.
  • Implementing constant pulling speed casting can avoid slag entrainment, and at the same time, non-metallic inclusions can fully collide, grow, float and be removed.
  • Heating Put the 150mm ⁇ 220mm small rectangular billet into a three-stage continuous push-steel heating furnace and heat it in a reducing atmosphere.
  • the residual oxygen content of the flue gas is 2.4%.
  • the temperature of the heating section of the heating furnace is controlled at 1128°C, the temperature of the soaking section is controlled at 1090°C, and the temperature difference across the billet section is less than 30°C.
  • the starting rolling temperature of intermediate and finishing rolling is 990°C; the final rolling temperature is controlled by controlling the final rolling speed, the final rolling temperature is 905°C, the final rolling speed 6m/s, and then twisted and vibrated in a serpentine shape against flat chains for transportation and cooling.
  • Cooling and coiling Air-cool the rolled steel strip, check the surface quality and dimensional tolerance, coil, pack and put it into storage.
  • the coiling temperature is 685°C.
  • composition characteristics of the 50CrVA hot-rolled steel strips for engine transmission chains prepared in Examples 1 to 3 of the present invention are shown in Table 1.
  • the thickness of the hot-rolled steel strip for the circlip engine transmission chain prepared in Examples 1 to 3, the thickness of the total decarburization layer on one side, the inclusion type grade, and the mechanical properties of the cold-rolled finished steel strip after quenching and tempering were tested. , the results obtained are shown in Table 2.
  • the industry control standard for the thickness of the decarburization layer is that when the steel strip thickness is ⁇ 3.00mm, the total decarburization layer on one side is ⁇ 0.08mm; when the steel strip thickness is >3.00mm, the total decarburization layer on one side is ⁇ 2.5% of the actual thickness. It can be seen from Table 2 that when the thickness of the steel strip produced by the present invention is ⁇ 3.00mm, the total decarburization layer on one side is 0.03mm and 0.03mm; when the steel strip thickness is >3.00mm, the total decarburization layer on one side is 0.03mm and 0.03mm respectively. 0.03mm and 0.04, 0.04mm, it can be seen that the finished product hot-rolled steel strip for engine transmission chain prepared by the present invention has less surface decarburization layer, which is better than the existing protocol control standard.
  • Inclusion types are divided into Type A sulfides, Type B oxides, Type C silicates, Type D spherical oxides and Type DS large particle inclusions, among which Type A, Type B, Type C and Type D inclusions are further divided into For fine series and coarse series, the lower the inclusion level, the higher the purity of the steel.
  • the specific protocol control standards are shown in Table 3. It can be seen from the inspection results in Table 2 that the inclusions in the steel strip prepared by the present invention are only Class A fine series, Class D fine series and thick series, and the others are all Class 0, indicating that the engine transmission chain prepared by the present invention
  • the finished product of hot-rolled steel strip has low inclusion content, and the material structure and grain size are fine and stable between different batches. It can be widely used in automobile engines and other fields.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

Est divulgué dans la présente invention un procédé de préparation d'acier 50CrVA pour une chaîne de transmission d'un moteur, le procédé comprenant les procédures de fusion en four électrique, de raffinage LF, de traitement sous vide VD, de coulée continue, de chauffage, de laminage, de refroidissement et de bobinage. Dans la présente invention, un agent de protection de four désoxydant est ajouté au point final de la fusion en four électrique pour une désoxydation pour garantir que la teneur en oxygène de l'acier fondu soit inférieure ou égale à 400 ppm pendant la coulée, de sorte à réduire la teneur en inclusions ; et à la fin, les teneurs en constituants initiaux de l'acier fondu atteint 70 à 90 % des limites inférieures de la teneur en constituants cibles ; lors du raffinage LF, l'acier fondu est allié au moyen de ferrosilicomanganèse, d'un ferrochrome à haute teneur en carbone, d'un alliage de ferrovanadium et d'un matériau de carbone de graphite de haute pureté, et est désoxydé au moyen d'un matériau de carbone de graphite de haute pureté et d'un carbure de silicium de haute pureté ; et au cours de la procédure de coulée continue, la coulée continue d'une petite billette carrée et d'une petite billette rectangulaire est utilisée, et une coulée à vitesse de traction constante est réalisée au moyen d'une machine de coulée continue de petite billette carrée cinq brins, cinq machines, de façon à améliorer la pureté d'une billette d'acier coulé. La teneur en inclusions du produit fini préparé selon la présente invention est aussi basse que celle de nuance 0,5 ou inférieure, la fluctuation des constituants chimiques est faible, et les performances de différents lots de matériaux sont stables ; un produit de bande d'acier final présente une plus faible décarburation de surface, une structure fine et uniforme, une taille de grain de nuance 7,0 et une bonne ténacité ; et une chaîne de transmission de moteur fabriquée à partir de celui-ci a une longue durée de vie.
PCT/CN2023/117357 2022-09-09 2023-09-07 Procédé de préparation d'acier 50crva pour chaîne de transmission de moteur WO2024051758A1 (fr)

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