WO2024046101A1 - 一种新能源汽车电机轴用棒材及其制备方法 - Google Patents

一种新能源汽车电机轴用棒材及其制备方法 Download PDF

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WO2024046101A1
WO2024046101A1 PCT/CN2023/112816 CN2023112816W WO2024046101A1 WO 2024046101 A1 WO2024046101 A1 WO 2024046101A1 CN 2023112816 W CN2023112816 W CN 2023112816W WO 2024046101 A1 WO2024046101 A1 WO 2024046101A1
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new energy
energy vehicle
temperature
refining
vehicle motor
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PCT/CN2023/112816
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English (en)
French (fr)
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祝瑞荣
徐晓春
郭子强
李海洋
秦萱
汪寿伟
周杨
赵大志
江雁
戴忠伟
邓伟
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南京钢铁股份有限公司
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Publication of WO2024046101A1 publication Critical patent/WO2024046101A1/zh

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    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
    • 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
    • B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
    • 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
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/18—Controlling or regulating processes or operations for pouring
    • 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
    • C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
    • C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
    • 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
    • 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
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • 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 the technical field of steel production, and in particular to a rod for a new energy vehicle motor shaft and a preparation method thereof.
  • the present invention aims to develop a special steel bar for motor shafts with high strength and long fatigue life.
  • the material's strength and uniform and fine austenite grain size can withstand the creep fatigue requirements at high rotation speeds of 10,000 Rpm.
  • the present invention aims at the above technical problems, overcomes the shortcomings of the existing technology, and provides a rod for a new energy vehicle motor shaft.
  • Its chemical composition and mass percentage are as follows: C: 0.14% ⁇ 0.21%, Si ⁇ 0.40%, Mn: 1.00 % ⁇ 1.40%, P ⁇ 0.025%, S: 0.010% ⁇ 0.035%, Cr: 0.80% ⁇ 1.20%, Mo: 0.10% ⁇ 0.20%, Al: 0.020% ⁇ 0.050%, H ⁇ 0.00015%, the rest is Fe and inevitable impurities. .
  • the aforementioned rod material for new energy vehicle motor shafts has the following chemical composition and mass percentage: C: 0.15% ⁇ 0.20%, Si ⁇ 0.35%, Mn: 1.10% ⁇ 1.40%, P ⁇ 0.025%, S :0.015% ⁇ 0.035%, Cr: 1.00% to 1.20%, Mo: 0.10% to 0.20%, Al: 0.020% to 0.050%, H ⁇ 0.00015%, and the rest is Fe and inevitable impurities.
  • the aforementioned rod material for new energy vehicle motor shafts has the following chemical composition and mass percentage: C: 0.16% ⁇ 0.20%, Si ⁇ 0.30%, Mn: 1.20% ⁇ 1.35%, P ⁇ 0.025%, S : 0.010% ⁇ 0.035%, Cr: 1.00% ⁇ 1.20%, Mo: 0.13% ⁇ 0.18%, Al: 0.020% ⁇ 0.050%, H ⁇ 0.00015%, the rest is Fe and inevitable impurities.
  • Another object of the present invention is to provide a method for preparing rods for new energy vehicle motor shafts, which includes electric furnace/converter smelting ⁇ LF refining ⁇ RH/VD refining ⁇ continuous pouring ⁇ billet heating ⁇ billet rolling ⁇ rolled material stacking Cold ⁇ ultrasonic flaw detection + magnetic flux leakage detection ⁇ packing and storage, details:
  • Electric furnace/converter smelting Control the C content at the smelting end point ⁇ 0.06% and P ⁇ 0.020%.
  • the electric furnace uses an eccentric furnace bottom to tap steel, leaving ⁇ 8 tons of steel.
  • the converter uses a sliding plate to stop slag, leaving ⁇ 1 ton of steel. Alloying is performed during tapping. Chemical treatment, adding lime, refining slag and fluorite slagging at the same time;
  • LF refining Aluminum wire is fed through a wire feeding machine in the early stage, and the Al content is controlled between 0.030% and 0.060%. SiC+Al powder is used for diffusion deoxidation throughout the process. At the same time, the composition of each element is fine-tuned to ensure that the TFe content in the slag at the end of the refining is ⁇ 0.4%. The element content reaches the target range;
  • RH/VD refining use high vacuum to remove H for a long time, vacuum degree ⁇ 100Pa, vacuum holding time ⁇ 20min, H content in the molten steel after dehydrogenation ⁇ 0.00015%;
  • Continuous casting It is produced using large-section cast slabs, and high superheat of 35 to 45°C is used for casting during the continuous casting process;
  • Cast slab heating Heating using high-temperature diffusion process, soaking temperature 1100 ⁇ 1200°C, total heating time ⁇ 360min;
  • KOCKS rolling mill is used for temperature-controlled rolling.
  • the entrance temperature of KOCKS rolling mill is 800 ⁇ 830°C, and water cooling is performed before entering KOCKS;
  • Stack cooling of rolled materials Collect stack cooling quickly after rolling.
  • the starting temperature of stack cooling is ⁇ 350°C and the end temperature of stack cooling is ⁇ 100 °C, further remove the H element;
  • Ultrasonic + magnetic flux leakage detection Ultrasonic flaw detection is performed according to the level 2 accuracy in GB/T 37566, ensuring that the largest defect in the rolled material is within ⁇ 0.5 ⁇ 6.4mm. Magnetic flux leakage detection is performed according to the accuracy of N-0.2mm to ensure that the surface of the rolled material is The maximum defect depth is within 0.2mm.
  • the critical hardenable diameter of the material reaches 60mm.
  • the material is maintained in a high temperature environment of 950 to 980°C for 6 hours, and still retains fine austenite grains, and the grain size reaches level 7 or above.
  • the low-temperature impact energy of the material reaches more than 30J at -20°C.
  • the present invention can effectively ensure the strength and toughness matching of the motor shaft for new energy vehicles.
  • the critical hardening diameter reaches 60mm, which can fully meet the core hardness requirements of motor shafts of various sizes and models; during the carburizing process of the motor shaft , can be maintained in a high temperature environment of 950 to 980°C for 6 hours, and still retains fine austenite grains, and the grain size reaches grade 7 or above, thus ensuring the fatigue life of the motor shaft at high speeds; it can withstand low temperature impact at -20°C
  • the power reaches more than 30J and can withstand the impact load on the motor shaft when starting a car in winter in most areas around the world;
  • water cooling is performed before entering KOCKS to ensure low-temperature rolling, obtain a fine rolled structure, and use fine grain strengthening to simultaneously improve the strength and toughness of the material to meet the high-speed and high-torque use environment of new energy vehicles. Require.
  • Figure 1 is a metallographic diagram of the austenite grain size 9.0 after carburizing at 980°C for 6 hours according to the present invention.
  • This embodiment provides a bar for new energy automobile motor shafts, using a 250 ⁇ 300mm cross-section continuous casting billet as a blank, and rolling ⁇ 45 ⁇ 120mm round steel.
  • the production process is as follows: electric furnace/converter smelting ⁇ LF refining ⁇ RH/VD refining ⁇ continuous pouring ⁇ billet heating ⁇ billet rolling ⁇ rolled material stack cooling ⁇ ultrasonic flaw detection + magnetic flux leakage detection ⁇ packaging and storage.
  • RH/VD refining vacuum degree 66Pa, vacuum holding time 22min, detected H content of molten steel 0.00011%%;
  • Heating heating time 382min, heating temperature 1173°C;
  • Billet rolling The inlet temperature of the KOCKS rolling mill is controlled to 817 ⁇ 825°C through water penetration during the rolling process;
  • Flaw detection The ultrasonic flaw detection accuracy is ⁇ 0.5 ⁇ 6.4mm, the magnetic flux leakage detection accuracy is N-0.2mm, and the flaw detection is qualified.
  • austenite grain size was detected to be grade 9.0, hardenability: J10-37HRC, J15-32HRC, banded structure after isothermal normalizing grade 1.0, tensile strength Rm-1237MPa, lower yield strength Rel-1031MPa, elongation after break A-18.5%, shrinkage of area Z-67%, KV2-37J in -20°C environment.
  • the performance of the above indicators is good and can well meet the use requirements of new energy vehicle motor shafts.
  • the performance indicators of the finished motor shaft processed by the user have been tested well and the fatigue test has passed.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Metal Rolling (AREA)

Abstract

本发明公开了一种新能源汽车电机轴用棒材及其制备方法，涉及钢铁生产技术领域，其化学成分及质量百分比如下：C：0.14％～0.21％，Si≤0.40％，Mn：1.00％～1.40％，P≤0.025％，S：0.010％～0.035％，Cr：0.80％～1.20％，Mo：0.10％～0.20％，Al：0.020％～0.050％，H≤0.00015％，其余为Fe和不可避免的杂质。该钢种可以很好地承受高转速、高扭矩的电动汽车的平稳行驶要求。

Description

一种新能源汽车电机轴用棒材及其制备方法 技术领域
本发明涉及钢铁生产技术领域，特别是涉及一种新能源汽车电机轴用棒材及其制备方法。
背景技术
近年来，在国际碳排放目标的指引下，采用燃油、燃气的汽车行业销量持续下滑，而采用清洁电能源的汽车销量逆势而上，国内外乘用车企业陆续开启转型计划。然而相比燃油汽车，电动汽车对钢材的各项指标要求更为严格。燃油汽车加速是一个逐步换挡的过程，其传动系统转速逐步增加，不同转速下采用不同零件负载。而电动汽车的加速过程则相反：一方面没有换挡系统，无论转速快慢，均是用的同一套传动零部件，另一方面电动汽车起步的瞬间是输出扭矩最大的瞬间，起步过程对整个系统的强韧性挑战巨大。此外，燃油汽车的发动机最高转速约为3000-5000Rpm，而电动汽车的转速一般都在10000Rpm以上。故而，新能源汽车对于传动系统用钢铁材料的综合性能提出了更加苛刻的要求。本发明旨在开发一种强度高、疲劳寿命长的电机轴用特殊钢棒材，该材料的强度及均匀细小的奥氏体晶粒度可以承受10000Rpm高转速下的蠕变疲劳需求。
发明内容
本发明针对上述技术问题，克服现有技术的缺点，提供一种新能源汽车电机轴用棒材，其化学成分及质量百分比如下：C：0.14％～0.21％，Si≤0.40％，Mn：1.00％～1.40％，P≤0.025％，S：0.010％～0.035％，Cr：0.80％～1.20％，Mo：0.10％～0.20％，Al：0.020％～0.050％，H≤0.00015％，其余为Fe和不可避免的杂质。。
本发明进一步限定的技术方案是：
前所述的一种新能源汽车电机轴用棒材，其化学成分及质量百分比如下：C：0.15％～0.20％，Si≤0.35％，Mn：1.10％～1.40％，P≤0.025％，S：0.015％～0.035％， Cr：1.00％～1.20％，Mo：0.10％～0.20％，Al：0.020％～0.050％，H≤0.00015％，其余为Fe和不可避免的杂质。
前所述的一种新能源汽车电机轴用棒材，其化学成分及质量百分比如下：C：0.16％～0.20％，Si≤0.30％，Mn：1.20％～1.35％，P≤0.025％，S：0.010％～0.035％，Cr：1.00％～1.20％，Mo：0.13％～0.18％，Al：0.020％～0.050％，H≤0.00015％，其余为Fe和不可避免的杂质。
本发明的另一目的在于提供一种新能源汽车电机轴用棒材制备方法，包括电炉/转炉冶炼→LF精炼→RH/VD精炼→连续浇注→铸坯加热→铸坯轧制→轧材堆冷→超声波探伤+漏磁探伤→打包入库，具体：
电炉/转炉冶炼：控制冶炼终点C含量≥0.06％，P≤0.020％，电炉采用偏心炉底出钢，留钢≥8吨，转炉采用滑板挡渣，留钢≥1吨，出钢时进行合金化处理，同时添加石灰、精炼渣、萤石造渣；
LF精炼：前期通过喂丝机喂入铝线，控制Al含量在0.030％～0.060％，全程采用SiC+Al粉扩散脱氧，同时微调各元素成分，保证精炼终点炉渣中TFe含量≤0.4％，各元素含量达到目标范围；
RH/VD精炼：采用高真空长时间脱H，真空度≤100Pa，真空保持时间≥20min，脱氢后钢液中H含量≤0.00015％；
连续浇注：采用大断面铸坯生产，连铸过程中采用高过热度35～45℃浇注；
铸坯加热：采用高温扩散工艺进行加热，均热温度1100～1200℃，总加热时间≥360min；
铸坯轧制：采用KOCKS轧机进行控温轧制，KOCKS轧机入口温度800～830℃，进入KOCKS前进行穿水冷却；
轧材堆冷：轧后快速收集堆冷，堆冷开始温度≥350℃，堆冷结束温度≤100 ℃，进一步进行H元素的去除；
超声波+漏磁探伤：超声波探伤按照GB/T 37566中的2级精度进行，保证轧材中最大缺陷在φ0.5×6.4mm以内，漏磁探伤按照N-0.2mm精度执行，确保轧材表面最大缺陷深度在0.2mm以内。
前所述的一种新能源汽车电机轴用棒材制备方法，材料的临界淬透直径达到60mm。
前所述的一种新能源汽车电机轴用棒材制备方法，材料在950～980℃高温环境下保持6小时，仍保有细小的奥氏体晶粒，晶粒度达到7级以上。
前所述的一种新能源汽车电机轴用棒材制备方法，材料在-20℃下低温冲击功达到30J以上。
本发明的有益效果是：
(1)本发明可以有效保证新能源汽车用电机轴的强韧性匹配，临界淬透直径达到60mm，可以较充分地满足各尺寸型号电机轴的心部硬度要求；在电机轴渗碳加工过程中，可以在950～980℃高温环境下保持6小时，仍保有细小的奥氏体晶粒，晶粒度达到7级以上，进而保证高转速下电机轴的疲劳寿命；在-20℃下低温冲击功达到30J以上，可以承受全球绝大多数地区冬季汽车起步时对电机轴的冲击载荷；
(2)本发明中采用大断面铸坯生产，保证轧制过程中足够的压缩比，以弥补心部疏松、缩孔等缺陷；连铸过程中采用高过热度35～45℃浇注，以发展柱状晶区域、压缩等轴晶面积，获得良好的横截面成分均匀性；
(3)本发明中进入KOCKS前进行穿水冷却，以保证低温轧制，获得细小的轧态组织，利用细晶强化同时提高材料的强韧性，满足新能源汽车高转速、高扭矩的使用环境要求。
附图说明
图1为本发明980℃渗碳6小时后的奥氏体晶粒度9.0级金相图。
具体实施方式
实施例1
本实施例提供的一种新能源汽车电机轴用棒材，以250×300mm断面连铸坯作为坯料，轧制φ45～120mm规格圆钢。其生产工艺流程如下：电炉/转炉冶炼→LF精炼→RH/VD精炼→连续浇注→铸坯加热→铸坯轧制→轧材堆冷→超声波探伤+漏磁探伤→打包入库，
冶炼：初炼炉终点C：0.07％，P≤0.011％，留钢量10吨；
LF精炼：前期Al含量0.053％，终点炉渣中TFe：0.25％，各元素含量达到目标范围；
RH/VD精炼：真空度66Pa，真空保持时间22min，检测钢液H含量0.00011％％；
合金成分：C：0.18％、Si：0.25％、Mn：1.25％、P：0.010％、S：0.025％、Cr：1.05％、Mo：0.16％、Al：0.025％、H：0.00011％，各元素均在本发明要求范围内；
连铸：铸坯断面250×300mm，浇注过热度39～42℃，等轴晶率27％；
加热：加热时间382min，加热温度1173℃；
铸坯轧制：通过轧制过程穿水控制KOCKS轧机入口温度817～825℃；
轧材堆冷：开始温度371℃，结束温度73℃；
探伤：超声波探伤精度φ0.5×6.4mm，漏磁探伤精度N-0.2mm，探伤合格。
产品性能如下：
980℃保温6h水淬后检测奥氏体晶粒度9.0级，淬透性：J10-37HRC、J15-32HRC，等温正火后带状组织1.0级，抗拉强度Rm-1237MPa，下屈服强度 Rel-1031MPa，断后延伸率A-18.5％，断面收缩率Z-67％，-20℃环境下KV2-37J。
上述各项指标性能良好，可以很好地满足新能源汽车电机轴的使用要求，用户加工的成品电机轴各项性能指标检测良好，疲劳试验通过。
除上述实施例外，本发明还可以有其他实施方式。凡采用等同替换或等效变换形成的技术方案，均落在本发明要求的保护范围。

Claims (7)

  1. 一种新能源汽车电机轴用棒材，其特征在于：其化学成分及质量百分比如下：C：0.14％～0.21％，Si≤0.40％，Mn：1.00％～1.40％，P≤0.025％，S：0.010％～0.035％，Cr：0.80％～1.20％，Mo：0.10％～0.20％，Al：0.020％～0.050％，H≤0.00015％，其余为Fe和不可避免的杂质。
  2. 根据权利要求1所述的一种新能源汽车电机轴用棒材，其特征在于：其化学成分及质量百分比如下：C：0.15％～0.20％，Si≤0.35％，Mn：1.10％～1.40％，P≤0.025％，S：0.015％～0.035％，Cr：1.00％～1.20％，Mo：0.10％～0.20％，Al：0.020％～0.050％，H≤0.00015％，其余为Fe和不可避免的杂质。
  3. 根据权利要求1所述的一种新能源汽车电机轴用棒材，其特征在于：其化学成分及质量百分比如下：C：0.16％～0.20％，Si≤0.30％，Mn：1.20％～1.35％，P≤0.025％，S：0.010％～0.035％，Cr：1.00％～1.20％，Mo：0.13％～0.18％，Al：0.020％～0.050％，H≤0.00015％，其余为Fe和不可避免的杂质。
  4. 一种新能源汽车电机轴用棒材制备方法，其特征在于：应用于权利要求1-3任意一项，包括电炉/转炉冶炼→LF精炼→RH/VD精炼→连续浇注→铸坯加热→铸坯轧制→轧材堆冷→超声波探伤+漏磁探伤→打包入库，具体：
    电炉/转炉冶炼：控制冶炼终点C含量≥0.06％，P≤0.020％，电炉采用偏心炉底出钢，留钢≥8吨，转炉采用滑板挡渣，留钢≥1吨，出钢时进行合金化处理，同时添加石灰、精炼渣、萤石造渣；
    LF精炼：前期通过喂丝机喂入铝线，控制Al含量在0.030％～0.060％，全程采用SiC+Al粉扩散脱氧，同时微调各元素成分，保证精炼终点炉渣中TFe含量≤0.4％，各元素含量达到目标范围；
    RH/VD精炼：采用高真空长时间脱H，真空度≤100Pa，真空保持时间≥20min，脱氢后钢液中H含量≤0.00015％；
    连续浇注：采用大断面铸坯生产，连铸过程中采用高过热度35～45℃浇注；
    铸坯加热：采用高温扩散工艺进行加热，均热温度1100～1200℃，总加热 时间≥360min；
    铸坯轧制：采用KOCKS轧机进行控温轧制，KOCKS轧机入口温度800～830℃，进入KOCKS前进行穿水冷却；
    轧材堆冷：轧后快速收集堆冷，堆冷开始温度≥350℃，堆冷结束温度≤100℃，进一步进行H元素的去除；
    超声波+漏磁探伤：超声波探伤按照GB/T 37566中的2级精度进行，保证轧材中最大缺陷在φ0.5×6.4mm以内，漏磁探伤按照N-0.2mm精度执行，确保轧材表面最大缺陷深度在0.2mm以内。
  5. 根据权利要求4所述的一种新能源汽车电机轴用棒材制备方法，其特征在于：材料的临界淬透直径达到60mm。
  6. 根据权利要求4所述的一种新能源汽车电机轴用棒材制备方法，其特征在于：材料在950～980℃高温环境下保持6小时，仍保有细小的奥氏体晶粒，晶粒度达到7级以上。
  7. 根据权利要求4所述的一种新能源汽车电机轴用棒材制备方法，其特征在于：材料在-20℃下低温冲击功达到30J以上。
PCT/CN2023/112816 2022-09-02 2023-08-14 一种新能源汽车电机轴用棒材及其制备方法 WO2024046101A1 (zh)

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