WO2023246799A1 - Tube en acier sans soudure utilisé pour un arbre de moteur électrique et présentant une résistance et une solidité élevées et de bonnes performances de traitement, et son procédé de fabrication - Google Patents

Tube en acier sans soudure utilisé pour un arbre de moteur électrique et présentant une résistance et une solidité élevées et de bonnes performances de traitement, et son procédé de fabrication Download PDF

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WO2023246799A1
WO2023246799A1 PCT/CN2023/101467 CN2023101467W WO2023246799A1 WO 2023246799 A1 WO2023246799 A1 WO 2023246799A1 CN 2023101467 W CN2023101467 W CN 2023101467W WO 2023246799 A1 WO2023246799 A1 WO 2023246799A1
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Prior art keywords
seamless steel
steel pipe
strength
motor shafts
manufacturing
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PCT/CN2023/101467
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English (en)
Chinese (zh)
Inventor
骆素珍
翟国丽
高展
刘文灏
孙文
陈志宏
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宝山钢铁股份有限公司
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Publication of WO2023246799A1 publication Critical patent/WO2023246799A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • 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
    • C21D1/26—Methods of annealing
    • 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
    • C21D1/26—Methods of annealing
    • C21D1/28—Normalising
    • 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
    • C21D11/00—Process control or regulation for heat treatments
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/005—Heat treatment of ferrous alloys containing Mn
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/008—Heat treatment of ferrous alloys containing Si
    • 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
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
    • 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
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
    • C21D8/105—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies of ferrous alloys
    • 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
    • C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
    • 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
    • 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
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • 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
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • 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
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
    • 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
    • C21D2211/005—Ferrite
    • 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
    • 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
    • C21D2211/009—Pearlite

Definitions

  • the present invention relates to a steel pipe and a manufacturing method thereof, in particular to a seamless steel pipe and a manufacturing method thereof.
  • components such as electric vehicle motor shafts are responsible for transmitting motor torque to the driving wheels and are very important safety components. Due to the high-speed operation of the motor shaft, the motor shaft not only bears a huge torsional moment during actual use, but also bears traction and braking forces from the wheels, such as longitudinal force, lateral force, vertical force and vibration impact force. Therefore, in the face of such harsh usage requirements, when actually preparing motor shafts, the industry usually requires materials with high strength and plasticity to ensure sufficient anti-torsion and anti-fatigue properties.
  • the publication number is CN104962838A
  • the publication date is October 7, 2015
  • the Chinese patent document titled "A high-strength steel, high-strength plastic seamless steel pipe for automobile transmission half shaft and its manufacturing method" discloses a high-strength plastic seamless steel pipe Strength steel, high-strength plastic seamless steel pipe for automobile transmission half shaft and manufacturing method thereof, its chemical composition is: C: 0.07 ⁇ 0.15%, Si: 0.1 ⁇ 1.0%, Mn: 2.0 ⁇ 2.6%, Ni: 0.05 ⁇ 0.6% , Cr: 0.2 ⁇ 1.0%, Mo: 0.1 ⁇ 0.6%, B: 0.001-0.006%, Cu: 0.05 ⁇ 0.50%; Al: 0.015 ⁇ 0.060%; Nb: 0.02-0.1%; V: 0.02-0.15%.
  • the steel pipe adopts a low-C design.
  • the strength of the prepared finished product is low, but it is conducive to welding and is more suitable for automobile axle shafts produced by friction stir welding.
  • the publication number is CN1388834A
  • the publication number is January 1, 2003
  • the Chinese patent document titled "A high carbon steel pipe with excellent cold working performance and high frequency hardening performance and its manufacturing method” discloses a High carbon steel pipe with excellent cold working performance and high frequency hardening performance and its manufacturing method, its public chemical composition mass percentage is: C 0.30 ⁇ 0.80%, Si ⁇ 2%, Mn ⁇ 3%.
  • special rolling technology is used to obtain a structure with cementite less than 1 ⁇ m, thereby improving the cold working performance and high-frequency hardening performance of the steel.
  • the present invention hopes to develop and obtain a new high-strength seamless steel pipe and its manufacturing method for preparing motor shafts.
  • One of the purposes of the present invention is to provide a high-strength seamless steel pipe for motor shafts with good processing performance.
  • the high-strength seamless steel pipe for motor shafts can obtain excellent mechanical properties through reasonable component matching and process design. It has very excellent mechanical properties before and after quenching and tempering heat treatment, and the hardness after quenching and tempering heat treatment can reach more than 58HRC, the strong plastic product (the product of tensile strength and elongation) is more than 15000MPa%, and it can withstand torque of more than 300KN. It is particularly suitable for It is suitable for preparing motor shaft parts that carry high torsional loads, and has good promotion prospects and application value.
  • the present invention provides a high-strength seamless steel pipe for motor shafts with good processing performance, which contains Fe and inevitable impurity elements, and also contains the following chemical elements in the following mass percentages:
  • the mass percentage of each chemical element is:
  • the mass percentage of each chemical element is:
  • the increase in the C element content is beneficial to improving the strength and fatigue resistance of the material, but the C element content in the steel pipe should not be too high.
  • the toughness and plasticity of the material will decrease, which is not conducive to cold processing, and it is prone to quality problems such as processing cracks and serious decarburization. Therefore, in the high-strength seamless steel pipe for motor shafts of the present invention, in order to ensure the quenching hardness and hardenability of the material, the mass percentage content of the C element is controlled between 0.40 and 0.60%, thereby ensuring both the quenching hardness and hardenability of the material. It has good hardenability and reduces the sensitivity of quenching cracking, which can ensure the cold working performance of steel.
  • the mass percentage of the C element can be further preferably controlled between 0.45% and 0.55%.
  • the Si element has a greater influence on the cold working performance.
  • Si is the residual element after deoxidation of steel during smelting. If the steel is required to have a lower content of Si, the deO2 method during the smelting process of molten steel needs to be changed. Therefore, it is necessary to comprehensively control the Al and Ca contents to ensure deoxidation. level, and ensure that the corresponding non-metallic inclusions have no adverse impact on the fatigue resistance of the steel. Based on this, in the high-strength seamless steel pipe for motor shafts of the present invention, the mass percentage content of Si element is controlled to 0 ⁇ Si ⁇ 0.25%.
  • the mass percentage content of the Si element can be further preferably controlled to 0 ⁇ Si ⁇ 0.20%. In some preferred embodiments, the mass percentage content of Si element is controlled to be 0.01% ⁇ Si ⁇ 0.20%. In some preferred embodiments, the mass percentage content of Si element is controlled to be 0.01% ⁇ Si ⁇ 0.23%.
  • Mn In the high-strength seamless steel pipe for motor shafts of the present invention, increasing the content of Mn element can improve the strength of the material, and Mn can stabilize the P and S elements, avoid the formation of low-melting point sulfide, and improve the material's strength. Thermal processing properties.
  • the Mn element content in the steel should not be too low.
  • the Mn element content in the steel is too low, the P and S elements cannot be well stabilized and the required effects cannot be achieved.
  • the Mn element content in the steel must not be too low. It should not be too high.
  • the mass percentage content of Mn element is controlled between 0.5% and 1.2%.
  • the mass percentage of the Mn element can be further preferably controlled between 0.6 and 1.0%.
  • Ti In the high-strength seamless steel pipe for motor shafts of the present invention, an appropriate amount of Ti element can improve the hardenability of the steel.
  • the Ti element can play a role in refining the grains together with C and N elements, but the steel The content of the Ti element should not be too high. Too high a content of Ti may cause difficulties in smelting and continuous casting. Therefore, in the high-strength seamless steel pipe for motor shafts of the present invention, when added, the mass percentage content of the Ti element is controlled to Ti ⁇ 0.045%.
  • the mass percentage of the Ti element can be further preferably controlled between 0.02% and 0.04%.
  • B In the high-strength seamless steel pipe for motor shafts of the present invention, an appropriate amount of B content can improve the hardenability and plasticity of the steel, but an excessively high content of B element may cause high-temperature brittleness of the steel. Therefore, in the high-strength seamless steel pipe for motor shafts of the present invention, when added, the mass percentage content of the B element is controlled to be B ⁇ 0.0045%.
  • the mass percentage of element B can be further preferably controlled between 0.002% and 0.004%.
  • N In the high-strength seamless steel pipe for motor shafts of the present invention, N is controlled within an appropriate range so that it can refine the grains together with Ti and B elements, thereby improving the performance of the material. Therefore, in the high-strength seamless steel pipe for motor shafts of the present invention, the mass percentage content of the N element is controlled between 0.0040% and 0.009%.
  • the mass percentage of the N element can be further preferably controlled between 0.0045% and 0.0085%.
  • Al is a deoxidizer during the smelting process. It can ensure the deoxidation effect of the steel together with Si and other elements, ensure the purity of the steel, and thus ensure the quality of the material. Anti-fatigue properties.
  • the content of Al element in steel should not be too high. When the content of Al element in steel is too high, it may lead to the production of abnormal alumina inclusions. Therefore, in order to exert the beneficial effects of the Al element, in the high-strength seamless steel pipe for motor shafts of the present invention, the mass percentage content of the Al element is controlled between 0.015% and 0.045%.
  • the mass percentage of the N element can be further preferably controlled between 0.015% and 0.035%.
  • Ca, Mg In the high-strength seamless steel pipe for motor shafts of the present invention, an appropriate amount of Ca and Mg can To improve the shape and performance of non-metallic inclusions, thereby improving the fatigue properties of materials, etc. Therefore, in order to exert the beneficial effects of Ca and Mg elements in the high-strength and easy-to-cut seamless steel pipe for motor shafts of the present invention, the inventor can consider adding Ca and/or Mg elements to the steel, which requires Ca, The sum of the mass percentages of the Mg element "Ca+Mg" is controlled between 0.001 and 0.006%.
  • the sum of the mass percentages of Ca and Mg elements "Ca+Mg" can be further preferably controlled between 0.001 and 0.004%.
  • the P element and the S element are both impurity elements in the steel pipe.
  • all efforts should be made to obtain a pipe with better performance and better quality. It is possible to reduce the content of impurity elements in high-strength seamless steel pipes for motor shafts.
  • P and S are both raw materials and auxiliary materials of steel or impurity elements introduced during the production process.
  • the P element can embrittle the grain boundaries and deteriorate the toughness and processing performance of the material; while the S element can be combined to form low melting point sulfides, resulting in a decrease in the processing performance and mechanical properties of the steel.
  • the contents of P, S, and O elements in the steel must be strictly controlled, and controlled to be P ⁇ 0.020%, S ⁇ 0.008%, and O ⁇ 0.0030%.
  • the contents of P, S, and O elements can be further controlled to satisfy: P ⁇ 0.015%, S ⁇ 0.005%, and O ⁇ 0.0025%.
  • the mass percentage content of each chemical element further satisfies at least one of the following items:
  • the microstructure is ferrite + pearlite; preferably, the seamless steel pipe has been normalized.
  • the microstructure after quenching and tempering heat treatment is martensite + retained austenite with a volume phase ratio of 1-25%.
  • the retained austenite proportion is 3-24%
  • the seamless steel pipe for motor shafts of the present invention its yield strength Rp 0.2 ⁇ 400MPa, tensile strength R m ⁇ 550MPa, and elongation A 50 ⁇ 22%; preferably, the seamless The steel pipe is normalized.
  • the seamless steel pipe for motor shafts of the present invention its yield strength Rp 0.2 ⁇ 420MPa, tensile strength R m ⁇ 570MPa, and elongation A 50 ⁇ 25%; preferably, the seamless The steel pipe is normalized.
  • the seamless steel pipe for motor shafts of the present invention its yield strength Rp 0.2 ⁇ 430MPa, tensile strength R m ⁇ 590MPa, and elongation A 50 ⁇ 25%; preferably, the seamless The steel pipe is normalized.
  • the performance after quenching and tempering heat treatment satisfies: yield strength R p0.2 ⁇ 1000MPa, tensile strength R m ⁇ 1400MPa, and elongation A 50 ⁇ 5%, its hardness is ⁇ 58HRC, its strong plastic area is greater than 15000MPa%, and its torsion resistance is ⁇ 300KN.
  • the performance after quenching and tempering heat treatment satisfies: yield strength R p0.2 ⁇ 1050MPa, tensile strength R m ⁇ 1500MPa, and elongation A 50 ⁇ 7%, its hardness is ⁇ 58HRC, its strong plastic area is greater than 16000MPa%, and its torsion resistance is ⁇ 350KN.
  • the performance after quenching and tempering heat treatment satisfies: yield strength R p0.2 ⁇ 1100MPa, tensile strength R m ⁇ 1600MPa, and elongation A 50 ⁇ 7%, its hardness is ⁇ 60HRC, its strong plastic area is greater than 18000MPa%, and its torsion resistance is ⁇ 400KN.
  • another object of the present invention is to provide a method for manufacturing the above-mentioned high-strength seamless steel pipe for motor shafts.
  • This manufacturing method optimizes the design of the process.
  • the manufacturing process is simple and easy to implement, and can effectively prepare the above-mentioned high-strength seamless steel pipe of the present invention.
  • High-strength seamless steel pipes are used for motor shafts, which have very good application prospects.
  • the present invention proposes the above-mentioned manufacturing method of high-strength seamless steel pipe for motor shaft, which includes the steps:
  • Heat treatment of cold drawn tube Normalize in the temperature range of 750 ⁇ 820°C, and the holding time is 20 ⁇ 60min to obtain the ferrite + pearlite structure.
  • the method also includes the following steps:
  • Quenching and tempering control the quenching temperature to 820-880°C, hold for 15-30 minutes, and water-cool; control the tempering temperature to 150-300°C, hold for 20-40 minutes, and air-cool.
  • the operator can specifically use an electric furnace or converter to smelt and refining to cast the tube blank, and specifically use continuous casting to cut the tube blank to obtain the required size.
  • the hot-rolled pipe material obtained in step (1) must be further intermediate heat treated and cold drawn to the required specifications and dimensional accuracy, and then further finished (cold drawn) Pipe) heat treatment, and finally obtain finished raw materials with good cold and cold processing properties.
  • the hot-rolled pipe material is controlled to be annealed in the temperature range of 650 to 800°C and kept for 20 to 80 minutes, which can ensure the cold drawing of the subsequent step (4).
  • the process went smoothly.
  • the cold-drawn pipe material prepared in the above-mentioned step (4) needs to be normalized in the temperature range of 750 to 820°C, kept for 20 to 60 minutes, and the atmosphere in the furnace needs to be controlled. , ensuring that there is no complete decarburization (that is, there is no full ferrite tissue area on the surface of the steel pipe), and the depth of semi-decarburization is ⁇ 150 ⁇ m.
  • the normalizing temperature and the cooling method it can ensure that the steel pipe obtains a ferrite + pearlite structure, thereby obtaining a normalized pipe whose strength and toughness meet the cold working requirements.
  • step (2) the tube blank is heated and kept at 1210-1280°C for 30-150 minutes.
  • step (2) the perforation temperature is controlled to be 1150-1250°C.
  • step (2) the hot continuous rolling temperature is controlled to be 1000-1200°C.
  • step (2) the tension and relaxation temperature is controlled to be 950 ⁇ 1000°C.
  • the tube blank is manufactured by circuit or converter smelting, refining and pouring, and is cut to the required size by continuous casting.
  • it also includes the steps of intermediate heat treatment and cold drawing to the required specifications and dimensional accuracy.
  • step (5) the pipe obtained by normalizing treatment is not completely decarburized, and the depth of semi-decarburization is ⁇ 150 ⁇ m.
  • the high-strength seamless steel pipe for motor shafts and its manufacturing method according to the present invention have the following advantages and beneficial effects:
  • the inventor can obtain a brand new high-strength seamless steel pipe for motor shafts through reasonable component matching and process design.
  • the microstructure of the high-strength seamless steel pipe for motor shafts after heat treatment is iron.
  • Prime body + pearlite, while the microstructure after further quenching and tempering heat treatment is martensite + retained austenite with a volume phase ratio of 1-25%.
  • the high-strength seamless steel pipe for motor shafts prepared by the present invention has Rp 0.2 ⁇ 400MPa, tensile strength R m ⁇ 550MPa, and elongation A 50 ⁇ 22% in the finished product state; however, the high-strength seamless steel pipe for motor shafts is After further quenching and tempering heat treatment, the strength of the seam steel pipe can be significantly improved.
  • the strong plastic product (the product of tensile strength and elongation) is greater than 15000MPa% and can withstand a torque of more than 300KN. It is especially suitable for preparing motor shaft parts carrying high torsional loads and has good promotion prospects and application value. .
  • Heating, perforation, hot rolling and tensioning heat and keep the tube blank at 1210 ⁇ 1280°C for 30 ⁇ 150min. Then perform high-temperature piercing between 1150 and 1250°C, and then perform high-temperature hot continuous rolling between 1000 and 1200°C. After completing the hot rolling, further conduct tension and reduction, and control the tension and reduction temperature to 950 to 1000°C to obtain Hot rolled pipe.
  • Cold-drawn pipe heat treatment Control the cold-drawn pipe material to be normalized in the temperature range of 750 to 820°C, and the holding time is 20 to 60 minutes to obtain the ferrite + pearlite structure.
  • Table 1 lists the mass percentage of each chemical element in the high-strength seamless steel pipe for motor shaft of Examples 1-10 and the comparative steel pipe of Comparative Examples 1-2.
  • Table 2 lists the specific process parameters used in the above manufacturing process steps for the high-strength seamless steel pipes for motor shafts in Examples 1-10 and the comparative steel pipes of Comparative Examples 1-2.
  • Tensile test According to GB/T 228.1-2010 Metal Materials
  • Tensile Test Part 1 Room Temperature Tensile Test Method, to test the steel pipes obtained in each example and comparative example before quenching and tempering heat treatment at room temperature. Yield strength, tensile strength and elongation values.
  • Table 3 lists the performance test results of the high-strength seamless steel pipes for motor shafts in Examples 1-10 that have not undergone quenching and tempering heat treatment and the comparative steel pipes in Comparative Examples 1-2.
  • the high-strength seamless steel pipes for motor shafts in Examples 1-10 already have very excellent mechanical properties, and their yield strength R p0.2 is at 417 -506MPa, its tensile strength R m is between 564-672MPa, and its elongation A 50 is between 23-30%.
  • the microstructure of the high-strength seamless steel pipes for motor shafts in Examples 1 to 10 was all ferrite + pearlite.
  • the inventor further tested the high-strength and toughness seamless steel pipes for motor shafts in the prepared finished product examples 1-10.
  • Seamless steel pipes and comparative steel pipes of Comparative Examples 1-2 were sampled separately, and the steel pipes of each Example and Comparative Example were subjected to quenching and tempering heat treatment.
  • the process of controlling the quenching and tempering heat treatment was as follows: the quenching temperature is 860°C, and the holding time is 20 minutes. Water cooling; tempering temperature is 250°C, holding time is 30min, air cooling.
  • the inventor After completing the quenching and tempering heat treatment of the steel pipes of the examples and comparative examples, the inventor further conducted a mechanical property test on the quenched and tempered heat treated steel pipes to measure the performance of the steel pipes after quenching and tempering heat treatment.
  • the relevant mechanical property test results are listed below in Table 4.
  • the tensile test process is the same as the test process in Table 3 above, which can also be measured corresponding to the quenching and tempering heat treatment. Yield strength, tensile strength and elongation of the steel pipes of Examples 1-10 and Comparative Examples 1-2.
  • Hardness test Use a Rockwell hardness tester to measure the hardness (HRC) of the steel pipes of Examples 1-10 and Comparative Examples 1-2 after quenching and tempering heat treatment.
  • Anti-torsion performance test Use a static torsion test device to measure the anti-torsion performance of the steel pipes of Examples 1-10 and Comparative Examples 1-2 after quenching and tempering heat treatment.
  • Table 4 lists the performance test results of the high-strength seamless steel pipes for motor shafts of Examples 1-10 and the comparative steel pipes of Comparative Examples 1-2 after quenching and tempering heat treatment.
  • Rm ⁇ A50 is the strong plastic product, which is the product of tensile strength and elongation.
  • the high-strength seamless steel pipes for motor shafts obtained in Examples 1-10 of the present invention all have excellent mechanical properties.
  • Their yield strength R p0.2 is between 1059-1169 MPa
  • their tensile strength R m is between 1400-1766MPa
  • elongation is between 9-15%
  • its strong plasticity R m ⁇ A 50 is between 15499-24724MPa%
  • hardness is between 59-64HRC
  • torsion resistance is between 346-597KN between.
  • Comparative Examples 1-2 Compared with Examples 1-10, in Comparative Examples 1-2, there are chemical components and/or processes that do not meet the design requirements of the present invention. This design makes at least one of the comparative steel pipes prepared in Comparative Examples 1-2 The mechanical properties failed to meet the requirements of the present invention. As shown in Table 4, the torsional properties of Comparative Examples 1 and 2 are lower than those of Examples 1-10.
  • Table 5 lists the microstructure observation and analysis results of the high-strength seamless steel pipes for motor shafts of Examples 1-10 and the comparative steel pipes of Comparative Examples 1-2 after quenching and tempering heat treatment.

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Abstract

Sont divulgués dans la présente invention un tube en acier sans soudure utilisé pour un arbre de moteur électrique et présentant une résistance et une solidité élevées et de bonnes performances de traitement, et son procédé de fabrication. Le tube en acier sans soudure comprend du Fe et les inévitables éléments d'impuretés, et comprend en outre les éléments chimiques suivants en pourcentages en masse : C : 0,40-0,60 %, 0 < Si ≤ 0,25 %, Mn : 0,5-1,2 %, Ti ≤ 0,045 %, B ≤ 0,0045 %, N : 0,0040-0,009 %, Al : 0,015-0,045 %, et Ca + Mg : 0,001-0,006 %. Le tube en acier sans soudure présente de très bonnes performances mécaniques avant et après trempe et tempérage à haute température ; et après trempe et tempérage à haute température, le tube en acier sans soudure présente une dureté allant jusqu'à 58 HRC ou plus, un produit de la résistance et de l'allongement supérieur à 15 000 MPa % et peut résister à un couple de 300 kN ou plus.
PCT/CN2023/101467 2022-06-22 2023-06-20 Tube en acier sans soudure utilisé pour un arbre de moteur électrique et présentant une résistance et une solidité élevées et de bonnes performances de traitement, et son procédé de fabrication WO2023246799A1 (fr)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20080057845A (ko) * 2006-12-21 2008-06-25 주식회사 포스코 연속로 열처리 특성이 우수한 열연강판 및 고강도 강관과그 제조방법
CN104962838A (zh) * 2015-06-18 2015-10-07 宝山钢铁股份有限公司 一种高强度钢、汽车传动半轴用高强塑无缝钢管及其制造方法
US20180327881A1 (en) * 2014-11-18 2018-11-15 Jfe Steel Corporation High-strength seamless steel pipe for oil country tubular goods and method of producing the same
CN112695248A (zh) * 2020-12-10 2021-04-23 包头钢铁（集团）有限责任公司 一种含稀土混凝土输送用耐磨热轧无缝钢管及其生产方法
CN113846262A (zh) * 2020-06-28 2021-12-28 宝山钢铁股份有限公司 一种汽车用整体式空心传动半轴用无缝钢管及其制造方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20080057845A (ko) * 2006-12-21 2008-06-25 주식회사 포스코 연속로 열처리 특성이 우수한 열연강판 및 고강도 강관과그 제조방법
US20180327881A1 (en) * 2014-11-18 2018-11-15 Jfe Steel Corporation High-strength seamless steel pipe for oil country tubular goods and method of producing the same
CN104962838A (zh) * 2015-06-18 2015-10-07 宝山钢铁股份有限公司 一种高强度钢、汽车传动半轴用高强塑无缝钢管及其制造方法
CN113846262A (zh) * 2020-06-28 2021-12-28 宝山钢铁股份有限公司 一种汽车用整体式空心传动半轴用无缝钢管及其制造方法
CN112695248A (zh) * 2020-12-10 2021-04-23 包头钢铁（集团）有限责任公司 一种含稀土混凝土输送用耐磨热轧无缝钢管及其生产方法

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