WO2022121565A1 - High-frequency induction-based local tempering heat treatment method for high-nitrogen stainless bearing steel - Google Patents

High-frequency induction-based local tempering heat treatment method for high-nitrogen stainless bearing steel Download PDF

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WO2022121565A1
WO2022121565A1 PCT/CN2021/128425 CN2021128425W WO2022121565A1 WO 2022121565 A1 WO2022121565 A1 WO 2022121565A1 CN 2021128425 W CN2021128425 W CN 2021128425W WO 2022121565 A1 WO2022121565 A1 WO 2022121565A1
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temperature
tempering
frequency induction
bearing steel
heat treatment
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French (fr)
Chinese (zh)
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徐海峰
曹文全
俞峰
王存宇
许达
王辉
翁宇庆
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钢铁研究总院
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    • 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
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • 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
    • C21D1/09—Surface hardening by direct application of electrical or wave energy; by particle radiation
    • C21D1/10—Surface hardening by direct application of electrical or wave energy; by particle radiation by electric induction
    • 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
    • C21D6/002—Heat treatment of ferrous alloys containing Cr
    • 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
    • C21D6/04—Hardening by cooling below 0 degrees Celsius
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • 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
    • Y02P10/25—Process efficiency

Definitions

  • the invention belongs to the technical field of material heat treatment, in particular to a high-frequency induction local tempering heat treatment method for high-nitrogen stainless bearing steel.
  • High nitrogen stainless bearing steel adds 0.10 to 0.50% nitrogen to medium and low carbon martensitic stainless steel, and the microstructure and carbides are significantly refined. After quenching and tempering, the room temperature hardness is ⁇ 58HRC. It has excellent properties such as high strength, high hardness, high wear resistance, high corrosion resistance and long life. It can be widely used in aerospace, precision machine tools, high-speed railways, nuclear power and oil drilling, etc. Fields use bearings.
  • Threaded bearing parts require that the hardness of the raceway working surface is ⁇ 58HRC, and the hardness of the threaded part is 38-42HRC, so as to ensure the overall performance of the bearing parts.
  • Most of these bearings use carburized steel for overall quenching and tempering treatment, surface carburizing quenching and low temperature tempering treatment, and then the final parts are machined.
  • the surface of these bearing parts has high hardness, and the core and thread parts have good toughness, but the temperature resistance and corrosion resistance are insufficient.
  • the use of high nitrogen stainless bearing steel to manufacture bearing parts can significantly improve temperature resistance and corrosion resistance.
  • High nitrogen stainless bearing steel is an integrally hardened steel, so a special heat treatment method is required to not only ensure the high hardness of the raceway working surface, but also make the thread part have a good match of strength and toughness.
  • the purpose of the present invention is to provide a high-frequency induction local tempering heat treatment method for high-nitrogen stainless bearing steel, which solves the problem of overall hardening of high-nitrogen stainless bearing steel, not only ensures the high hardness of the raceway working surface, but also makes the thread
  • the parts have a good match of strength and toughness.
  • the invention makes the thread part of the high nitrogen stainless bearing steel part soften locally after the heat treatment to reach the hardness requirement of 38-42HRC, and at the same time, the raceway working surface maintains a high hardness of more than 58HRC, which meets the requirement of Requirements for the use of bearing parts.
  • the invention provides a high-frequency induction local tempering heat treatment method for high-nitrogen stainless bearing steel.
  • the composition percentage of the high-nitrogen stainless bearing steel C0.3-0.65%, Si ⁇ 1.0%, Mn ⁇ 1.0% , S ⁇ 0.015%, P ⁇ 0.025%, Cr14.5 ⁇ 16.0%, Mo0.85 ⁇ 1.10%, N0.2 ⁇ 0.5%, the balance is Fe and inevitable impurity elements;
  • the steel is subjected to overall quenching and tempering and high-frequency induction local tempering.
  • the specific process steps and control technical parameters are as follows:
  • the high nitrogen stainless bearing steel is subjected to overall quenching, cold treatment and low temperature tempering in a box-type medium temperature furnace.
  • the temperature of the quenching is 1030°C ⁇ 1050°C, and the temperature range of the cold treatment is -73°C ⁇ - 80°C, the temperature of the low temperature tempering is 150°C ⁇ 180°C, and the room temperature hardness is 58 ⁇ 61HRC;
  • High-frequency induction local tempering The high-nitrogen stainless bearing steel processed in step (1) is subjected to high-frequency induction local tempering treatment, and pure copper circles are used to make ring inductors or profiling inductors, and the induction power frequency is 20 ⁇ 30KHz, heating power 20 ⁇ 30KW, quenching cooling medium is 8 ⁇ 9% water-based quenching liquid, the temperature range of the high-frequency induction local tempering treatment is 700 ⁇ 800°C, the surface induction heating time is 2 ⁇ 6 seconds, heating After air cooling to room temperature, the surface hardness is 38-42HRC.
  • step (2) (3) low-temperature tempering is further included, and the (3) low-temperature tempering is: treating the high-nitrogen stainless bearing steel processed in step (2) at a box-type medium temperature
  • the furnace performs low-temperature tempering, and the temperature range of the low-temperature tempering is 150° C. to 180° C. to eliminate the internal stress generated by induction tempering.
  • step (1) the temperature of the quenching is controlled at 1030-1050 °C, the holding time is 30-60 minutes, the temperature of the cold treatment is controlled at -73--80 °C, and the holding time is 60-120 minutes, so The temperature of the low-temperature tempering is controlled at 150-180° C., and the holding time is 120-240 minutes.
  • step (1) the temperature of the quenching is controlled at 1030°C, the holding time is 60 minutes, the temperature of the cold treatment is controlled at -73°C, the holding time is 60 minutes, and the temperature of the low-temperature tempering is controlled at 150°C °C, the holding time is 120 minutes.
  • the temperature range of the high-frequency induction local tempering treatment in step (2) is 700-800° C., and the surface induction heating time is 2-4 seconds.
  • the temperature of the high-frequency induction local tempering treatment in step (2) is 750° C.
  • the surface induction heating time is 3 seconds.
  • the temperature of the high-frequency induction local tempering treatment in step (2) is 800°C, and the surface induction heating time is 4 seconds.
  • the temperature of the high-frequency induction local tempering treatment in step (2) is 800° C.
  • the surface induction heating time is 6 seconds.
  • the composition percentage of the high nitrogen stainless bearing steel C0.30%, Si0.50%, Mn0.45%, S0.0016%, P0.017%, Cr15.58%, Mo1.02%, N0.38%, the balance is Fe and inevitable impurity elements.
  • the present invention also provides the high-nitrogen stainless bearing steel prepared by the high-frequency induction local tempering heat treatment method described in the above technical solution.
  • the hardness of the raceway surface of the high nitrogen stainless bearing steel is greater than or equal to 58HRC, and the hardness of the threaded portion is 38-42HRC.
  • the advantages of the present invention a) the structure, mechanical properties and corrosion resistance of the parts using high nitrogen stainless bearing steel can be improved; b) the hardness of the raceway surface after quenching and tempering-induction local tempering is ⁇ 58HRC, and the thread The hardness of the part can be reduced to 38-42HRC, and the hardness increases gradually from the thread to the raceway surface; c) Compared with the traditional lead bath or salt bath partial tempering treatment, the whole process of induction partial tempering takes less time and has high efficiency, which can be realized Automate batch processing.
  • Composition percentage of high nitrogen stainless bearing steel C0.30%, Si0.50%, Mn0.45%, S0.0016%, P0.017%, Cr15.58%, Mo1.02%, N0.38%, except Inevitable impurity element, the remainder is Fe.
  • step (1) the material processed in step (1) is subjected to induction local tempering on a high-frequency induction CNC quenching machine tool, the power frequency is 23KHz, the heating power is 25KW, the workpiece rotation speed is 280 rpm, and the heating temperature is about 750°C, air cooling after heating time of 3s, continuous spray cooling on raceway surface, cooling water pressure 0.3MPa, water temperature 26°C.
  • step (2) The material treated in step (2) is subjected to low temperature tempering treatment at 150°C in a medium temperature box furnace to eliminate the internal stress generated during the induction tempering treatment, and the final hardness of the raceway surface is above 58HRC, and the hardness of the thread part is 42HRC.
  • step (1) The material processed in step (1) is subjected to induction local tempering on a high-frequency induction CNC quenching machine tool, the power frequency is 25KHz, the heating power is 30KW, the workpiece rotation speed is 280 rpm, and the heating temperature is about 800°C, air cooling after heating time of 4s, continuous spray cooling on the raceway surface, cooling water pressure 0.3MPa, water temperature 26°C.
  • step (2) The material treated in step (2) is subjected to low temperature tempering treatment at 150°C in a medium temperature box furnace to eliminate the internal stress generated during the induction tempering treatment, and the final hardness of the raceway surface is above 58HRC, and the hardness of the thread part is 40HRC.
  • step (1) The material processed in step (1) is subjected to induction local tempering on a high-frequency induction CNC quenching machine tool, the power frequency is 25KHz, the heating power is 30KW, the workpiece rotation speed is 280 rpm, and the heating temperature is about 800°C, air cooling after heating time of 6s, continuous spray cooling on the raceway surface, cooling water pressure 0.3MPa, water temperature 26°C.
  • step (2) The material treated in step (2) is subjected to low temperature tempering treatment at 150°C in a medium temperature box furnace to eliminate the internal stress generated during the induction tempering treatment, and the final hardness of the raceway surface is above 58HRC, and the hardness of the thread part is 38HRC.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
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Abstract

The present invention relates to the technical field of heat treatment of materials, and provides a high-frequency induction-based local tempering heat treatment method for high-nitrogen stainless bearing steel. The high-nitrogen stainless bearing steel comprises the following components in percentage: C: 0.3-0.65%, Si≤1.0%, Mn≤1.0%, S≤0.015%, P≤0.025%, Cr: 14.5-16.0%, Mo: 0.85-1.10%, N: 0.2-0.5%, and the balance of Fe other than inevitable impurity elements. By performing overall quenching and tempering and high-frequency induction-based local tempering on the high-nitrogen stainless bearing steel, a threaded portion of a high-nitrogen stainless bearing steel part is locally softened after the heat treatment to meet the hardness requirement of 38-42 HRC; moreover, a raceway working surface maintains a high hardness of 58 HRC or above, thereby meeting use requirements of a bearing part. The present invention has the advantage that the problem of overall hardening of the high-nitrogen stainless bearing steel is solved, such that the high hardness of the raceway working surface is guaranteed, and the threaded portion has good matching of strength and toughness.

Description

一种高氮不锈轴承钢的高频感应局部回火热处理方法A high-frequency induction local tempering heat treatment method for high nitrogen stainless bearing steel
本申请要求于2020年12月10日提交中国专利局、申请号为CN202011440576.1、发明名称为“一种高氮不锈轴承钢的高频感应局部回火热处理方法”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。This application requires the priority of the Chinese patent application submitted to the China Patent Office on December 10, 2020, the application number is CN202011440576.1, and the invention title is "A high-frequency induction local tempering heat treatment method for high nitrogen stainless bearing steel" rights, the entire contents of which are incorporated herein by reference.
技术领域technical field
本发明属于材料热处理技术领域，具体涉及一种高氮不锈轴承钢的高频感应局部回火热处理方法。The invention belongs to the technical field of material heat treatment, in particular to a high-frequency induction local tempering heat treatment method for high-nitrogen stainless bearing steel.
背景技术Background technique
高氮不锈轴承钢在中低碳马氏体不锈钢中加入0.10～0.50％的氮，微观组织与碳化物显著细化，钢中碳氮化物尺寸≤15μm，晶粒度达到8级以上，整体淬回火处理后室温硬度≥58HRC，具有高强度、高硬度、高耐磨、高耐蚀以及长寿命等优异性能，可广泛应用于航空航天、精密机床、高速铁路、核动力和石油钻井等领域使用轴承。High nitrogen stainless bearing steel adds 0.10 to 0.50% nitrogen to medium and low carbon martensitic stainless steel, and the microstructure and carbides are significantly refined. After quenching and tempering, the room temperature hardness is ≥58HRC. It has excellent properties such as high strength, high hardness, high wear resistance, high corrosion resistance and long life. It can be widely used in aerospace, precision machine tools, high-speed railways, nuclear power and oil drilling, etc. Fields use bearings.
带螺纹轴承零件要求滚道工作面硬度≥58HRC，螺纹部位硬度38～42HRC，从而保证轴承零件的整体使用性能。这类轴承大多采用渗碳钢整体调质处理，表面渗碳淬火和低温回火处理后，进行最终零件机械加工。这类轴承零件表面其硬度高、心部及螺纹部韧性好，但耐温性能与耐蚀性能不足，而采用高氮不锈轴承钢制造轴承零件可提升明显耐温性和耐蚀性。高氮不锈轴承钢属整体硬化钢，因此需要一种特殊热处理方法既保证滚道工作面的高硬度，又使螺纹部位具有良好的强韧性匹配。Threaded bearing parts require that the hardness of the raceway working surface is ≥58HRC, and the hardness of the threaded part is 38-42HRC, so as to ensure the overall performance of the bearing parts. Most of these bearings use carburized steel for overall quenching and tempering treatment, surface carburizing quenching and low temperature tempering treatment, and then the final parts are machined. The surface of these bearing parts has high hardness, and the core and thread parts have good toughness, but the temperature resistance and corrosion resistance are insufficient. The use of high nitrogen stainless bearing steel to manufacture bearing parts can significantly improve temperature resistance and corrosion resistance. High nitrogen stainless bearing steel is an integrally hardened steel, so a special heat treatment method is required to not only ensure the high hardness of the raceway working surface, but also make the thread part have a good match of strength and toughness.
发明内容SUMMARY OF THE INVENTION
本发明的目的在于提供一种高氮不锈轴承钢的高频感应局部回火热处理方法，解决了高氮不锈轴承钢整体硬化的问题，既保证滚道工作面的高硬度，又使螺纹部位具有良好的强韧性匹配。The purpose of the present invention is to provide a high-frequency induction local tempering heat treatment method for high-nitrogen stainless bearing steel, which solves the problem of overall hardening of high-nitrogen stainless bearing steel, not only ensures the high hardness of the raceway working surface, but also makes the thread The parts have a good match of strength and toughness.
本发明针对高氮不锈轴承钢的组织性能特点，使得高氮不锈轴承钢零件热处理后螺纹部位局部软化，达到38～42HRC的硬度要求，同时滚道 工作面保持58HRC以上的高硬度，满足轴承零件的使用要求。Aiming at the microstructure and performance characteristics of the high nitrogen stainless bearing steel, the invention makes the thread part of the high nitrogen stainless bearing steel part soften locally after the heat treatment to reach the hardness requirement of 38-42HRC, and at the same time, the raceway working surface maintains a high hardness of more than 58HRC, which meets the requirement of Requirements for the use of bearing parts.
本发明提供了一种高氮不锈轴承钢的高频感应局部回火热处理方法，所述的高氮不锈轴承钢成分百分比：C0.3～0.65％，Si≤1.0％，Mn≤1.0％，S≤0.015％，P≤0.025％，Cr14.5～16.0％，Mo0.85～1.10％，N0.2～0.5％，余量为Fe和不可避免的杂质元素；通过对高氮不锈轴承钢进行整体淬回火和高频感应局部回火，具体工艺步骤及控制的技术参数如下：The invention provides a high-frequency induction local tempering heat treatment method for high-nitrogen stainless bearing steel. The composition percentage of the high-nitrogen stainless bearing steel: C0.3-0.65%, Si≤1.0%, Mn≤1.0% , S≤0.015%, P≤0.025%, Cr14.5～16.0%, Mo0.85～1.10%, N0.2～0.5%, the balance is Fe and inevitable impurity elements; The steel is subjected to overall quenching and tempering and high-frequency induction local tempering. The specific process steps and control technical parameters are as follows:
(1)整体硬化：高氮不锈轴承钢在箱式中温炉进行整体淬火、冷处理及低温回火，所述淬火的温度1030℃～1050℃，所述冷处理的温度范围在-73℃～-80℃，所述低温回火的温度在150℃～180℃，室温硬度58～61HRC；(1) Overall hardening: The high nitrogen stainless bearing steel is subjected to overall quenching, cold treatment and low temperature tempering in a box-type medium temperature furnace. The temperature of the quenching is 1030℃～1050℃, and the temperature range of the cold treatment is -73℃～- 80℃, the temperature of the low temperature tempering is 150℃～180℃, and the room temperature hardness is 58～61HRC;
(2)高频感应局部回火：对步骤(1)处理的高氮不锈轴承钢进行高频感应局部回火处理，采用纯铜圆制作环感应器或仿形感应器，感应电源频率20～30KHz，加热功率20～30KW，淬火冷却介质为8～9％水基淬火液，所述高频感应局部回火处理的温度范围在700～800℃，表面感应加热时间2～6秒，加热后空冷至室温，表面硬度38～42HRC。(2) High-frequency induction local tempering: The high-nitrogen stainless bearing steel processed in step (1) is subjected to high-frequency induction local tempering treatment, and pure copper circles are used to make ring inductors or profiling inductors, and the induction power frequency is 20 ～30KHz, heating power 20～30KW, quenching cooling medium is 8～9% water-based quenching liquid, the temperature range of the high-frequency induction local tempering treatment is 700～800℃, the surface induction heating time is 2～6 seconds, heating After air cooling to room temperature, the surface hardness is 38-42HRC.
优选地，步骤(2)高频感应局部回火后还包括(3)低温回火，所述(3)低温回火为：对步骤(2)处理的高氮不锈轴承钢在箱式中温炉进行低温回火，所述低温回火的温度范围在150℃～180℃，以消除感应回火产生的内应力。Preferably, after the high-frequency induction local tempering in step (2), (3) low-temperature tempering is further included, and the (3) low-temperature tempering is: treating the high-nitrogen stainless bearing steel processed in step (2) at a box-type medium temperature The furnace performs low-temperature tempering, and the temperature range of the low-temperature tempering is 150° C. to 180° C. to eliminate the internal stress generated by induction tempering.
优选地，步骤(1)中：所述淬火的温度控制在1030～1050℃，保温时间30～60分钟，所述冷处理的温度控制在-73～-80℃，保温时间60～120分钟，所述低温回火的温度控制在150～180℃，保温时间120～240分钟。Preferably, in step (1): the temperature of the quenching is controlled at 1030-1050 °C, the holding time is 30-60 minutes, the temperature of the cold treatment is controlled at -73--80 °C, and the holding time is 60-120 minutes, so The temperature of the low-temperature tempering is controlled at 150-180° C., and the holding time is 120-240 minutes.
优选地，步骤(1)中：所述淬火的温度控制在1030℃，保温时间60分钟，所述冷处理的温度控制在-73℃，保温时间60分钟，所述低温回火的温度控制在150℃，保温时间120分钟。Preferably, in step (1): the temperature of the quenching is controlled at 1030°C, the holding time is 60 minutes, the temperature of the cold treatment is controlled at -73°C, the holding time is 60 minutes, and the temperature of the low-temperature tempering is controlled at 150°C ℃, the holding time is 120 minutes.
优选地，步骤(2)所述高频感应局部回火处理的温度范围在700～800℃，表面感应加热时间2～4秒。Preferably, the temperature range of the high-frequency induction local tempering treatment in step (2) is 700-800° C., and the surface induction heating time is 2-4 seconds.
优选地，步骤(2)所述高频感应局部回火处理的温度为750℃，表面感应加热时间3秒。Preferably, the temperature of the high-frequency induction local tempering treatment in step (2) is 750° C., and the surface induction heating time is 3 seconds.
优选地，步骤(2)所述高频感应局部回火处理的温度为800℃，表面感 应加热时间4秒。Preferably, the temperature of the high-frequency induction local tempering treatment in step (2) is 800°C, and the surface induction heating time is 4 seconds.
优选地，步骤(2)所述高频感应局部回火处理的温度为800℃，表面感应加热时间6秒。Preferably, the temperature of the high-frequency induction local tempering treatment in step (2) is 800° C., and the surface induction heating time is 6 seconds.
优选地，所述的高氮不锈轴承钢成分百分比：C0.30％，Si0.50％，Mn0.45％，S0.0016％，P0.017％，Cr15.58％，Mo1.02％，N0.38％，余量为Fe和不可避免的杂质元素。Preferably, the composition percentage of the high nitrogen stainless bearing steel: C0.30%, Si0.50%, Mn0.45%, S0.0016%, P0.017%, Cr15.58%, Mo1.02%, N0.38%, the balance is Fe and inevitable impurity elements.
本发明还提供了上述技术方案所述的高频感应局部回火热处理方法制得的高氮不锈轴承钢。The present invention also provides the high-nitrogen stainless bearing steel prepared by the high-frequency induction local tempering heat treatment method described in the above technical solution.
优选地，所述高氮不锈轴承钢的滚道面硬度≥58HRC，螺纹部位硬度为38～42HRC。Preferably, the hardness of the raceway surface of the high nitrogen stainless bearing steel is greater than or equal to 58HRC, and the hardness of the threaded portion is 38-42HRC.
本发明的优点：a)采用高氮不锈轴承钢的零件在组织结构、力学性能及耐蚀性能可得到改善提升；b)淬回火-感应局部回火后滚道面硬度≥58HRC，螺纹部位硬度可降至38～42HRC，而且由螺纹至滚道面硬度呈梯度上升；c)较传统铅浴或盐浴局部回火处理，感应局部回火整个工序耗时短，效率高，可实现自动化批量处理。The advantages of the present invention: a) the structure, mechanical properties and corrosion resistance of the parts using high nitrogen stainless bearing steel can be improved; b) the hardness of the raceway surface after quenching and tempering-induction local tempering is ≥58HRC, and the thread The hardness of the part can be reduced to 38-42HRC, and the hardness increases gradually from the thread to the raceway surface; c) Compared with the traditional lead bath or salt bath partial tempering treatment, the whole process of induction partial tempering takes less time and has high efficiency, which can be realized Automate batch processing.
具体实施方式Detailed ways
高氮不锈轴承钢成分百分比：C0.30％，Si0.50％，Mn0.45％，S0.0016％，P0.017％，Cr15.58％，Mo1.02％，N0.38％，除不可避免的杂质元素，余量为Fe。Composition percentage of high nitrogen stainless bearing steel: C0.30%, Si0.50%, Mn0.45%, S0.0016%, P0.017%, Cr15.58%, Mo1.02%, N0.38%, except Inevitable impurity element, the remainder is Fe.
实施例1Example 1
(1)整体硬化：高氮不锈轴承钢进行淬火、冷处理及两次低温回火的硬化处理，淬火温度1030℃，保温时间60分钟，冷处理温度-73℃，保温60分钟，回火温度为150℃，保温时间120分钟。(1) Overall hardening: High nitrogen stainless bearing steel is hardened by quenching, cold treatment and two low-temperature tempering treatments. 150°C, holding time for 120 minutes.
(2)高频感应回火：对步骤(1)处理的材料在高频感应数控淬火机床上进行感应局部回火，电源频率23KHz，加热功率25KW，工件旋转速度280转/分钟，加热温度约750℃，加热时间3s后空冷，滚道面持续喷液冷却，冷却水压0.3MPa，水温26℃。(2) High-frequency induction tempering: the material processed in step (1) is subjected to induction local tempering on a high-frequency induction CNC quenching machine tool, the power frequency is 23KHz, the heating power is 25KW, the workpiece rotation speed is 280 rpm, and the heating temperature is about 750℃, air cooling after heating time of 3s, continuous spray cooling on raceway surface, cooling water pressure 0.3MPa, water temperature 26℃.
(3)低温回火：步骤(2)处理后的材料在中温箱式炉中进行150℃低温回火处理，消除感应回火处理时产生内应力，最终滚道面硬度58HRC以 上，螺纹部位硬度42HRC。(3) Low temperature tempering: The material treated in step (2) is subjected to low temperature tempering treatment at 150°C in a medium temperature box furnace to eliminate the internal stress generated during the induction tempering treatment, and the final hardness of the raceway surface is above 58HRC, and the hardness of the thread part is 42HRC.
实施例2Example 2
(1)整体硬化：高氮不锈轴承钢进行淬火、冷处理及两次低温回火的硬化处理，淬火温度1030℃，保温时间60分钟，冷处理温度-73℃，保温60分钟，回火温度为150℃，保温时间120分钟。(1) Overall hardening: High nitrogen stainless bearing steel is hardened by quenching, cold treatment and two low-temperature tempering treatments. 150°C, holding time for 120 minutes.
(2)高频感应回火：对步骤(1)处理的材料在高频感应数控淬火机床上进行感应局部回火，电源频率25KHz，加热功率30KW，工件旋转速度280转/分钟，加热温度约800℃，加热时间4s后空冷，滚道面持续喷液冷却，冷却水压0.3MPa，水温26℃。(2) High-frequency induction tempering: The material processed in step (1) is subjected to induction local tempering on a high-frequency induction CNC quenching machine tool, the power frequency is 25KHz, the heating power is 30KW, the workpiece rotation speed is 280 rpm, and the heating temperature is about 800℃, air cooling after heating time of 4s, continuous spray cooling on the raceway surface, cooling water pressure 0.3MPa, water temperature 26℃.
(3)低温回火：步骤(2)处理后的材料在中温箱式炉中进行150℃低温回火处理，消除感应回火处理时产生内应力，最终滚道面硬度58HRC以上，螺纹部位硬度40HRC。(3) Low temperature tempering: The material treated in step (2) is subjected to low temperature tempering treatment at 150°C in a medium temperature box furnace to eliminate the internal stress generated during the induction tempering treatment, and the final hardness of the raceway surface is above 58HRC, and the hardness of the thread part is 40HRC.
实施例3Example 3
(1)整体硬化：高氮不锈轴承钢进行淬火、冷处理及两次低温回火的硬化处理，淬火温度1030℃，保温时间60分钟，冷处理温度-73℃，保温60分钟，回火温度为150℃，保温时间120分钟。(1) Overall hardening: High nitrogen stainless bearing steel is hardened by quenching, cold treatment and two low-temperature tempering treatments. 150°C, holding time for 120 minutes.
(2)高频感应回火：对步骤(1)处理的材料在高频感应数控淬火机床上进行感应局部回火，电源频率25KHz，加热功率30KW，工件旋转速度280转/分钟，加热温度约800℃，加热时间6s后空冷，滚道面持续喷液冷却，冷却水压0.3MPa，水温26℃。(2) High-frequency induction tempering: The material processed in step (1) is subjected to induction local tempering on a high-frequency induction CNC quenching machine tool, the power frequency is 25KHz, the heating power is 30KW, the workpiece rotation speed is 280 rpm, and the heating temperature is about 800℃, air cooling after heating time of 6s, continuous spray cooling on the raceway surface, cooling water pressure 0.3MPa, water temperature 26℃.
(3)低温回火：步骤(2)处理后的材料在中温箱式炉中进行150℃低温回火处理，消除感应回火处理时产生内应力，最终滚道面硬度58HRC以上，螺纹部位硬度38HRC。(3) Low temperature tempering: The material treated in step (2) is subjected to low temperature tempering treatment at 150°C in a medium temperature box furnace to eliminate the internal stress generated during the induction tempering treatment, and the final hardness of the raceway surface is above 58HRC, and the hardness of the thread part is 38HRC.
以上实施例的说明只是用于帮助理解本发明的方法及其核心思想。应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明原理的前提下，还可以对本发明进行若干改进和修饰，这些改进和修饰也落入本发明权利要求的保护范围内。对这些实施例的多种修改对本领域的专业技术人员来说是显而易见的，本文中所定义的一般原理可以在不脱离本发明的 精神或范围的情况下在其它实施例中实现。因此，本发明将不会被限制于本文所示的这些实施例，而是要符合与本文所公开的原理和新颖特点相一致的最宽的范围。The descriptions of the above embodiments are only used to help understand the method and the core idea of the present invention. It should be pointed out that for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can also be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (11)

  1. 一种高氮不锈轴承钢的高频感应局部回火热处理方法，其特征在于，所述的高氮不锈轴承钢成分百分比：C0.3～0.65％，Si≤1.0％，Mn≤1.0％，S≤0.015％，P≤0.025％，Cr14.5～16.0％，Mo0.85～1.10％，N0.2～0.5％，余量为Fe和不可避免的杂质元素；通过对高氮不锈轴承钢进行整体淬回火和高频感应局部回火，具体工艺步骤及控制的技术参数如下：A high-frequency induction local tempering heat treatment method for high-nitrogen stainless bearing steel, characterized in that the composition percentage of the high-nitrogen stainless bearing steel: C0.3-0.65%, Si≤1.0%, Mn≤1.0% , S≤0.015%, P≤0.025%, Cr14.5～16.0%, Mo0.85～1.10%, N0.2～0.5%, the balance is Fe and inevitable impurity elements; The steel is subjected to overall quenching and tempering and high-frequency induction local tempering. The specific process steps and control technical parameters are as follows:
    (1)整体硬化：高氮不锈轴承钢在箱式中温炉进行整体淬火、冷处理及低温回火，所述淬火的温度1030℃～1050℃，所述冷处理的温度范围在-73℃～-80℃，所述低温回火的温度在150℃～180℃，室温硬度58～61HRC；(1) Overall hardening: The high nitrogen stainless bearing steel is subjected to overall quenching, cold treatment and low temperature tempering in a box-type medium temperature furnace. The temperature of the quenching is 1030℃～1050℃, and the temperature range of the cold treatment is -73℃～- 80℃, the temperature of the low temperature tempering is 150℃～180℃, and the room temperature hardness is 58～61HRC;
    (2)高频感应局部回火：对步骤(1)处理的高氮不锈轴承钢进行高频感应局部回火处理，采用纯铜圆制作环感应器或仿形感应器，感应电源频率20～30KHz，加热功率20～30KW，淬火冷却介质为8～9％水基淬火液，所述高频感应局部回火处理的温度范围在700～800℃，表面感应加热时间2～6秒，加热后空冷至室温，表面硬度38～42HRC。(2) High-frequency induction local tempering: The high-nitrogen stainless bearing steel processed in step (1) is subjected to high-frequency induction local tempering treatment, and pure copper circles are used to make ring inductors or profiling inductors, and the induction power frequency is 20 ～30KHz, heating power 20～30KW, quenching cooling medium is 8～9% water-based quenching liquid, the temperature range of the high-frequency induction local tempering treatment is 700～800℃, the surface induction heating time is 2～6 seconds, heating After air cooling to room temperature, the surface hardness is 38-42HRC.
  2. 根据权利要求1所述的高频感应局部回火热处理方法，其特征在于，步骤(2)高频感应局部回火后还包括(3)低温回火，所述(3)低温回火为：对步骤(2)处理的高氮不锈轴承钢在箱式中温炉进行低温回火，所述低温回火的温度范围在150℃～180℃，以消除感应回火产生的内应力。The high-frequency induction local tempering heat treatment method according to claim 1, wherein the step (2) after the high-frequency induction local tempering further comprises (3) low temperature tempering, and the (3) low temperature tempering is: The high-nitrogen stainless bearing steel processed in step (2) is tempered at a low temperature in a box-type medium temperature furnace, and the temperature of the low-temperature tempering is in the range of 150°C to 180°C, so as to eliminate the internal stress generated by the induction tempering.
  3. 根据权利要求1所述的高频感应局部回火热处理方法，其特征在于：步骤(1)中：所述淬火的温度控制在1030～1050℃，保温时间30～60分钟，所述冷处理的温度控制在-73～-80℃，保温时间60～120分钟，所述低温回火的温度控制在150～180℃，保温时间120～240分钟。The high-frequency induction local tempering heat treatment method according to claim 1, wherein: in step (1): the temperature of the quenching is controlled at 1030-1050°C, the holding time is 30-60 minutes, and the temperature of the cold treatment is controlled at 1030-1050° C. The temperature of the low temperature tempering is controlled at -73--80°C, the holding time is 60-120 minutes, the temperature of the low-temperature tempering is controlled at 150-180°C, and the holding time is 120-240 minutes.
  4. 根据权利要求3所述的高频感应局部回火热处理方法，其特征在于：步骤(1)中：所述淬火的温度控制在1030℃，保温时间60分钟，所述冷处理的温度控制在-73℃，保温时间60分钟，所述低温回火的温度控制在150℃，保温时间120分钟。The high-frequency induction local tempering heat treatment method according to claim 3, characterized in that: in step (1): the temperature of the quenching is controlled at 1030°C, the holding time is 60 minutes, and the temperature of the cold treatment is controlled at -73°C °C, the holding time is 60 minutes, the temperature of the low-temperature tempering is controlled at 150 °C, and the holding time is 120 minutes.
  5. 根据权利要求1所述的高频感应局部回火热处理方法，其特征在于：步骤(2)所述高频感应局部回火处理的温度范围在700～800℃，表面感应加 热时间2～4秒。The high-frequency induction local tempering heat treatment method according to claim 1, wherein the temperature range of the high-frequency induction local tempering treatment in step (2) is 700-800°C, and the surface induction heating time is 2-4 seconds .
  6. 根据权利要求5所述的高频感应局部回火热处理方法，其特征在于：步骤(2)所述高频感应局部回火处理的温度为750℃，表面感应加热时间3秒。The high-frequency induction local tempering heat treatment method according to claim 5, wherein the temperature of the high-frequency induction local tempering treatment in step (2) is 750°C, and the surface induction heating time is 3 seconds.
  7. 根据权利要求5所述的高频感应局部回火热处理方法，其特征在于：步骤(2)所述高频感应局部回火处理的温度为800℃，表面感应加热时间4秒。The high-frequency induction local tempering heat treatment method according to claim 5, wherein the temperature of the high-frequency induction local tempering treatment in step (2) is 800°C, and the surface induction heating time is 4 seconds.
  8. 根据权利要求1所述的高频感应局部回火热处理方法，其特征在于：步骤(2)所述高频感应局部回火处理的温度为800℃，表面感应加热时间6秒。The high-frequency induction local tempering heat treatment method according to claim 1, wherein the temperature of the high-frequency induction local tempering treatment in step (2) is 800°C, and the surface induction heating time is 6 seconds.
  9. 根据权利要求1所述的高频感应局部回火热处理方法，其特征在于：所述的高氮不锈轴承钢成分百分比：C0.30％，Si0.50％，Mn0.45％，S0.0016％，P0.017％，Cr15.58％，Mo1.02％，N0.38％，余量为Fe和不可避免的杂质元素。The high-frequency induction local tempering heat treatment method according to claim 1, wherein the composition percentage of the high nitrogen stainless bearing steel: C0.30%, Si0.50%, Mn0.45%, S0.0016 %, P0.017%, Cr15.58%, Mo1.02%, N0.38%, the balance is Fe and inevitable impurity elements.
  10. 权利要求1～9任一项所述的高频感应局部回火热处理方法制得的高氮不锈轴承钢。The high nitrogen stainless bearing steel obtained by the high-frequency induction local tempering heat treatment method according to any one of claims 1 to 9.
  11. 根据权利要求10所述的高氮不锈轴承钢，其特征在于，所述高氮不锈轴承钢的滚道面硬度≥58HRC，螺纹部位硬度为38～42HRC。The high-nitrogen stainless bearing steel according to claim 10, characterized in that, the hardness of the raceway surface of the high-nitrogen stainless bearing steel is ≥58HRC, and the hardness of the threaded part is 38-42HRC.
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