WO2018103088A1 - Bearing steel heat treatment process - Google Patents

Bearing steel heat treatment process Download PDF

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Publication number
WO2018103088A1
WO2018103088A1 PCT/CN2016/109272 CN2016109272W WO2018103088A1 WO 2018103088 A1 WO2018103088 A1 WO 2018103088A1 CN 2016109272 W CN2016109272 W CN 2016109272W WO 2018103088 A1 WO2018103088 A1 WO 2018103088A1
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furnace
temperature
bearing steel
treatment
heat treatment
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PCT/CN2016/109272
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French (fr)
Chinese (zh)
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孙振田
马飞
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孙振田
马飞
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Priority to PCT/CN2016/109272 priority Critical patent/WO2018103088A1/en
Publication of WO2018103088A1 publication Critical patent/WO2018103088A1/en

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    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D1/00General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18Hardening; Quenching with or without subsequent tempering
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D1/00General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26Methods of annealing
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D1/00General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26Methods of annealing
    • C21D1/28Normalising
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D6/00Heat treatment of ferrous alloys
    • C21D6/04Hardening by cooling below 0 degrees Celsius

Abstract

A bearing steel heat treatment process, comprising: normalizing treatment; annealing treatment; quenching treatment; freezing treatment; and tempering treatment. Segmented heating is used for normalizing, annealing, and tempering. Heat-treated bearing steel has high strength and high hardness.

Description

一种轴承钢热处理工艺Bearing steel heat treatment process 技术领域Technical field
本发明涉及轴承钢热处理技术领域,尤其涉及一种轴承钢热处理工艺。The invention relates to the technical field of heat treatment of bearing steel, in particular to a heat treatment process of bearing steel.
背景技术Background technique
现有的轴承钢热处理工艺中常出现的问题是退火速度过快,导致轴承钢的脆硬性较强,在制作成轴承后,由于轴长期旋转运动,使轴承所承担的不只是只有轴向力,还有一部分径向力,该径向力与轴承发生撞击,轴承在使用一段时间后会有断裂的状况发生。又由于轴承钢热处理过程中,只经历一次淬火和低温回火,使轴承钢的强度、硬度、耐磨性与抗疲劳性能均相对较差,为此我们提出了一种轴承钢热处理工艺。The existing problem in the heat treatment process of the existing bearing steel is that the annealing speed is too fast, which leads to the strong brittleness of the bearing steel. After the bearing is made into a bearing, the bearing bears not only the axial force due to the long-term rotational motion of the shaft. There is also a portion of the radial force that collides with the bearing and the bearing will break after a period of use. Because of the quenching and low temperature tempering in the heat treatment process of bearing steel, the strength, hardness, wear resistance and fatigue resistance of bearing steel are relatively poor. Therefore, we propose a heat treatment process for bearing steel.
发明内容Summary of the invention
基于背景技术存在的技术问题,本发明提出了一种轴承钢热处理工艺。Based on the technical problems existing in the background art, the present invention proposes a heat treatment process for bearing steel.
本发明提出的一种轴承钢热处理工艺,包括以下步骤:The heat treatment process of a bearing steel proposed by the invention comprises the following steps:
S1,正火处理:将炉内的温度升至450-650℃,将轴承钢放入炉中,将炉内的温度以20-30℃/h的速度升至720-820℃,保温1-2h,轴承钢出炉在空气中通过风扇冷却;S1, normalizing treatment: raise the temperature in the furnace to 450-650 ° C, put the bearing steel into the furnace, raise the temperature in the furnace to 720-820 ° C at 20-30 ° C / h, keep warm 1- 2h, the bearing steel is cooled in the air by a fan;
S2,退火处理:轴承钢在炉中加热到520-680℃,保温0.5-1h,再将炉内的温度以30-40℃/h的速度降至500-550℃,保温0.5-1h后,将炉内的温度以20-30℃/h的速度升至700-800℃,最后将炉内 的温度以50-60℃/h的速度降至500-600℃,随炉冷却;S2, annealing treatment: the bearing steel is heated to 520-680 ° C in the furnace, the temperature is kept for 0.5-1 h, and then the temperature in the furnace is lowered to 500-550 ° C at a rate of 30-40 ° C / h, after 0.5-1 h of heat preservation, Raise the temperature in the furnace to 700-800 ° C at a rate of 20-30 ° C / h, and finally put the furnace inside The temperature is reduced to 500-600 ° C at a rate of 50-60 ° C / h, and is cooled with the furnace;
S3,淬火处理:将轴承钢在炉中加热到温度为300-500℃,保温0.5-1h后,取出轴承钢并在油中淬火,油的温度为120-200℃,持续10-30min;S3, quenching treatment: the bearing steel is heated in the furnace to a temperature of 300-500 ° C, after 0.5-1 h of heat preservation, the bearing steel is taken out and quenched in oil, the temperature of the oil is 120-200 ° C, lasting 10-30 min;
S4,回火处理:将淬火后的轴承钢先冷冻处理,再置于回火炉中,将炉内的温度升到100-150℃,持续40-70min,随后将炉内的温度升至160-180℃,持续20-40℃,最后将炉内的温度降至90-140℃,持续10-30min,取出在空气中自然冷却;S4, tempering treatment: the quenched bearing steel is first frozen and then placed in a tempering furnace, the temperature in the furnace is raised to 100-150 ° C for 40-70 min, and then the temperature in the furnace is raised to 160- 180 ° C, lasting 20-40 ° C, and finally reduce the temperature in the furnace to 90-140 ° C for 10-30 min, take out and cool naturally in the air;
S5,保温处理:将S4中冷却后的轴承钢放入保温箱中,在100-120℃的温度下保温3-5h即可完成热处理。S5, heat preservation treatment: the bearing steel cooled in S4 is placed in an incubator, and the heat treatment is completed by holding at a temperature of 100-120 ° C for 3-5 hours.
优选地,所述S1中,风扇设置在轴承钢的四周。Preferably, in the S1, the fan is disposed around the bearing steel.
优选地,所述S1中,风扇等间距设置在轴承钢的一侧。Preferably, in the S1, the fan is equidistantly disposed on one side of the bearing steel.
优选地,所述S2中,轴承钢在炉中加热到600℃,保温0.75h,再将炉内的温度以35℃/h的速度降至525℃,保温0.75h后,将炉内的温度以25℃/h的速度升至750℃,最后将炉内的温度以55℃/h的速度降至550℃,随炉冷却。Preferably, in the S2, the bearing steel is heated to 600 ° C in the furnace, the temperature is maintained for 0.75 h, and the temperature in the furnace is lowered to 525 ° C at a rate of 35 ° C / h. After the temperature is maintained for 0.75 h, the temperature in the furnace is set. The temperature was raised to 750 ° C at a rate of 25 ° C / h, and finally the temperature in the furnace was lowered to 550 ° C at a rate of 55 ° C / h, and cooled with the furnace.
优选地,所述S3中,将轴承钢在炉中加热到温度为400℃,保温0.75h后,取出轴承钢并在油中淬火,油的温度为160℃,持续20min。Preferably, in the S3, the bearing steel is heated in the furnace to a temperature of 400 ° C, and after the heat preservation for 0.75 h, the bearing steel is taken out and quenched in the oil, and the temperature of the oil is 160 ° C for 20 min.
优选地,所述S4中,冷冻处理为:将轴承钢置于-140℃到-90℃之间的温度下进行冷冻处理。Preferably, in the S4, the freezing treatment is: freezing the bearing steel at a temperature between -140 ° C and -90 ° C.
本发明中,适当增加淬火次数,并优化改变淬火的相关参数,先 通过正火处理,将炉内的温度提升,保温一段时间后继续提升,再通过风扇对其冷却,而后进行相应的退火、淬火和回火处理,最后对轴承钢保温处理,保证轴承钢强度、硬度得到提高,并提高轴承钢的耐磨性和抗疲劳性能,本发明的轴承钢热处理工艺操作方便,热处理后的轴承钢相对于传统的工艺处理后轴承钢具有强度高、硬度高的优点,更加耐磨和抗疲劳,性能得到提高。In the present invention, the number of quenching is appropriately increased, and the relevant parameters for changing the quenching are optimized, first Through normalizing treatment, the temperature in the furnace is raised, and the temperature is increased after a period of time, and then cooled by a fan, and then subjected to corresponding annealing, quenching and tempering treatment, and finally the bearing steel is insulated to ensure the strength of the bearing steel. The hardness is improved, and the wear resistance and fatigue resistance of the bearing steel are improved. The heat treatment process of the bearing steel of the invention is convenient to operate, and the bearing steel after the heat treatment has the advantages of high strength and high hardness compared with the conventional processed bearing steel. More wear and fatigue resistance, improved performance.
具体实施方式detailed description
下面结合具体实施例对本发明作进一步解说。The invention is further illustrated below in conjunction with specific embodiments.
实施例一Embodiment 1
本发明提出的一种轴承钢热处理工艺,包括以下步骤:The heat treatment process of a bearing steel proposed by the invention comprises the following steps:
S1,正火处理:将炉内的温度升至450℃,将轴承钢放入炉中,将炉内的温度以20℃/h的速度升至720℃,保温1h,轴承钢出炉在空气中通过风扇冷却;S1, normalizing treatment: the temperature in the furnace is raised to 450 ° C, the bearing steel is placed in the furnace, the temperature in the furnace is raised to 720 ° C at a rate of 20 ° C / h, and the temperature is kept for 1 h, and the bearing steel is discharged in the air. Cooled by a fan;
S2,退火处理:轴承钢在炉中加热到520℃,保温0.5h,再将炉内的温度以30℃/h的速度降至500℃,保温0.5h后,将炉内的温度以20℃/h的速度升至700℃,最后将炉内的温度以50℃/h的速度降至500℃,随炉冷却;S2, annealing treatment: the bearing steel is heated to 520 ° C in the furnace, kept for 0.5 h, and then the temperature in the furnace is reduced to 500 ° C at a rate of 30 ° C / h, after 0.5 h of heat preservation, the temperature in the furnace is 20 ° C The speed of /h rises to 700 ° C, and finally the temperature in the furnace is lowered to 500 ° C at a rate of 50 ° C / h, and is cooled with the furnace;
S3,淬火处理:将轴承钢在炉中加热到温度为300℃,保温0.5h后,取出轴承钢并在油中淬火,油的温度为120℃,持续10min;S3, quenching treatment: the bearing steel is heated in the furnace to a temperature of 300 ° C, after 0.5 h of heat preservation, the bearing steel is taken out and quenched in oil, the temperature of the oil is 120 ° C for 10 min;
S4,回火处理:将淬火后的轴承钢先冷冻处理,再置于回火炉中,将炉内的温度升到100℃,持续40min,随后将炉内的温度升至160℃,持续20℃,最后将炉内的温度降至90℃,持续10min,取出在空气 中自然冷却;S4, tempering treatment: the quenched bearing steel is first frozen and then placed in a tempering furnace, the temperature in the furnace is raised to 100 ° C for 40 min, and then the temperature in the furnace is raised to 160 ° C for 20 ° C Finally, the temperature in the furnace is lowered to 90 ° C for 10 min, and taken out in the air. Natural cooling;
S5,保温处理:将S4中冷却后的轴承钢放入保温箱中,在100℃的温度下保温3h即可完成热处理。S5, heat preservation treatment: the bearing steel cooled in S4 is placed in an incubator, and the heat treatment is completed by holding at a temperature of 100 ° C for 3 hours.
实施例二Embodiment 2
本发明提出的一种轴承钢热处理工艺,包括以下步骤:The heat treatment process of a bearing steel proposed by the invention comprises the following steps:
S1,正火处理:将炉内的温度升至500℃,将轴承钢放入炉中,将炉内的温度以22℃/h的速度升至740℃,保温1.2h,轴承钢出炉在空气中通过风扇冷却;S1, normalizing treatment: the temperature in the furnace is raised to 500 ° C, the bearing steel is placed in the furnace, the temperature in the furnace is raised to 740 ° C at a rate of 22 ° C / h, and the temperature is kept for 1.2 h, and the bearing steel is discharged in the air. Cooled by a fan;
S2,退火处理:轴承钢在炉中加热到540℃,保温0.6h,再将炉内的温度以32℃/h的速度降至510℃,保温0.6h后,将炉内的温度以22℃/h的速度升至720℃,最后将炉内的温度以52℃/h的速度降至520℃,随炉冷却;S2, annealing treatment: the bearing steel is heated to 540 ° C in the furnace, kept for 0.6 h, and then the temperature in the furnace is reduced to 510 ° C at a rate of 32 ° C / h, after holding for 0.6 h, the temperature in the furnace is 22 ° C The speed of /h rises to 720 ° C, and finally the temperature in the furnace is reduced to 520 ° C at a rate of 52 ° C / h, and is cooled with the furnace;
S3,淬火处理:将轴承钢在炉中加热到温度为350℃,保温0.6h后,取出轴承钢并在油中淬火,油的温度为130℃,持续15min;S3, quenching treatment: the bearing steel is heated in the furnace to a temperature of 350 ° C, after holding for 0.6 h, the bearing steel is taken out and quenched in oil, the temperature of the oil is 130 ° C, lasting 15 min;
S4,回火处理:将淬火后的轴承钢先冷冻处理,再置于回火炉中,将炉内的温度升到110℃,持续50min,随后将炉内的温度升至165℃,持续25℃,最后将炉内的温度降至100℃,持续15min,取出在空气中自然冷却;S4, tempering treatment: the quenched bearing steel is first frozen and then placed in a tempering furnace, the temperature in the furnace is raised to 110 ° C for 50 min, and then the temperature in the furnace is raised to 165 ° C for 25 ° C Finally, the temperature in the furnace is lowered to 100 ° C for 15 min, and taken out and naturally cooled in the air;
S5,保温处理:将S4中冷却后的轴承钢放入保温箱中,在105℃的温度下保温3.5h即可完成热处理。S5, heat preservation treatment: the bearing steel cooled in S4 is placed in an incubator, and heat treatment is completed at 105 ° C for 3.5 h.
实施例三Embodiment 3
本发明提出的一种轴承钢热处理工艺,包括以下步骤: The heat treatment process of a bearing steel proposed by the invention comprises the following steps:
S1,正火处理:将炉内的温度升至550℃,将轴承钢放入炉中,将炉内的温度以25℃/h的速度升至770℃,保温1.5h,轴承钢出炉在空气中通过风扇冷却;S1, normalizing treatment: raise the temperature in the furnace to 550 ° C, put the bearing steel into the furnace, raise the temperature in the furnace to 770 ° C at 25 ° C / h, keep warm for 1.5 h, and the bearing steel is baked in the air. Cooled by a fan;
S2,退火处理:轴承钢在炉中加热到600℃,保温0.75h,再将炉内的温度以35℃/h的速度降至525℃,保温0.75h后,将炉内的温度以25℃/h的速度升至750℃,最后将炉内的温度以55℃/h的速度降至550℃,随炉冷却;S2, annealing treatment: the bearing steel is heated to 600 ° C in the furnace, the temperature is kept for 0.75 h, and the temperature in the furnace is reduced to 525 ° C at a rate of 35 ° C / h. After the heat preservation for 0.75 h, the temperature in the furnace is 25 ° C. The speed of /h rises to 750 ° C, and finally the temperature in the furnace is lowered to 550 ° C at a rate of 55 ° C / h, and is cooled with the furnace;
S3,淬火处理:将轴承钢在炉中加热到温度为400℃,保温0.75h后,取出轴承钢并在油中淬火,油的温度为160℃,持续20min;S3, quenching treatment: the bearing steel is heated in the furnace to a temperature of 400 ° C, after 0.75 h of heat preservation, the bearing steel is taken out and quenched in oil, the temperature of the oil is 160 ° C for 20 min;
S4,回火处理:将淬火后的轴承钢先冷冻处理,再置于回火炉中,将炉内的温度升到125℃,持续55min,随后将炉内的温度升至170℃,持续30℃,最后将炉内的温度降至115℃,持续20min,取出在空气中自然冷却;S4, tempering treatment: the quenched bearing steel is first frozen and then placed in a tempering furnace, the temperature in the furnace is raised to 125 ° C for 55 min, and then the temperature in the furnace is raised to 170 ° C for 30 ° C Finally, the temperature in the furnace is lowered to 115 ° C for 20 min, and taken out and naturally cooled in the air;
S5,保温处理:将S4中冷却后的轴承钢放入保温箱中,在110℃的温度下保温4h即可完成热处理。S5, heat preservation treatment: the bearing steel cooled in S4 is placed in an incubator, and the heat treatment is completed by holding at a temperature of 110 ° C for 4 hours.
实施例四Embodiment 4
本发明提出的一种轴承钢热处理工艺,包括以下步骤:The heat treatment process of a bearing steel proposed by the invention comprises the following steps:
S1,正火处理:将炉内的温度升至600℃,将轴承钢放入炉中,将炉内的温度以28℃/h的速度升至800℃,保温1.8h,轴承钢出炉在空气中通过风扇冷却;S1, normalizing treatment: the temperature in the furnace is raised to 600 ° C, the bearing steel is placed in the furnace, the temperature in the furnace is raised to 800 ° C at a rate of 28 ° C / h, the heat is maintained for 1.8 h, and the bearing steel is discharged in the air. Cooled by a fan;
S2,退火处理:轴承钢在炉中加热到640℃,保温0.9h,再将炉内的温度以38℃/h的速度降至540℃,保温0.9h后,将炉内的温度 以28℃/h的速度升至780℃,最后将炉内的温度以58℃/h的速度降至580℃,随炉冷却;S2, annealing treatment: the bearing steel is heated to 640 ° C in the furnace, and the temperature is kept for 0.9 h. Then the temperature in the furnace is lowered to 540 ° C at a rate of 38 ° C / h. After the temperature is maintained for 0.9 h, the temperature in the furnace is set. Raise to 780 ° C at a rate of 28 ° C / h, and finally reduce the temperature in the furnace to 580 ° C at a rate of 58 ° C / h, with the furnace cooling;
S3,淬火处理:将轴承钢在炉中加热到温度为450℃,保温0.9h后,取出轴承钢并在油中淬火,油的温度为180℃,持续25min;S3, quenching treatment: the bearing steel is heated in the furnace to a temperature of 450 ° C, after holding for 0.9 h, the bearing steel is taken out and quenched in oil, the temperature of the oil is 180 ° C, lasting 25 min;
S4,回火处理:将淬火后的轴承钢先冷冻处理,再置于回火炉中,将炉内的温度升到140℃,持续60min,随后将炉内的温度升至175℃,持续35℃,最后将炉内的温度降至130℃,持续25min,取出在空气中自然冷却;S4, tempering treatment: the quenched bearing steel is first frozen and then placed in a tempering furnace, the temperature in the furnace is raised to 140 ° C for 60 min, and then the temperature in the furnace is raised to 175 ° C for 35 ° C Finally, the temperature in the furnace is lowered to 130 ° C for 25 min, and taken out and naturally cooled in the air;
S5,保温处理:将S4中冷却后的轴承钢放入保温箱中,在115℃的温度下保温4.5h即可完成热处理。S5, heat preservation treatment: the bearing steel cooled in S4 is placed in an incubator, and the heat treatment is completed by holding at a temperature of 115 ° C for 4.5 hours.
实施例五Embodiment 5
本发明提出的一种轴承钢热处理工艺,包括以下步骤:The heat treatment process of a bearing steel proposed by the invention comprises the following steps:
S1,正火处理:将炉内的温度升至650℃,将轴承钢放入炉中,将炉内的温度以30℃/h的速度升至820℃,保温2h,轴承钢出炉在空气中通过风扇冷却;S1, normalizing treatment: raise the temperature in the furnace to 650 ° C, put the bearing steel into the furnace, raise the temperature in the furnace to 820 ° C at 30 ° C / h, keep warm for 2 h, and the bearing steel is baked in the air. Cooled by a fan;
S2,退火处理:轴承钢在炉中加热到680℃,保温1h,再将炉内的温度以40℃/h的速度降至550℃,保温1h后,将炉内的温度以30℃/h的速度升至800℃,最后将炉内的温度以60℃/h的速度降至600℃,随炉冷却;S2, annealing treatment: the bearing steel is heated to 680 ° C in the furnace, kept for 1 h, and then the temperature in the furnace is reduced to 550 ° C at a rate of 40 ° C / h. After 1 h of heat preservation, the temperature in the furnace is 30 ° C / h. The speed is increased to 800 ° C, and finally the temperature in the furnace is reduced to 600 ° C at a rate of 60 ° C / h, and cooled with the furnace;
S3,淬火处理:将轴承钢在炉中加热到温度为500℃,保温1h后,取出轴承钢并在油中淬火,油的温度为200℃,持续30min;S3, quenching treatment: the bearing steel is heated in the furnace to a temperature of 500 ° C, after 1 h of heat preservation, the bearing steel is taken out and quenched in oil, the temperature of the oil is 200 ° C, lasting 30 min;
S4,回火处理:将淬火后的轴承钢先冷冻处理,再置于回火炉中, 将炉内的温度升到150℃,持续70min,随后将炉内的温度升至180℃,持续40℃,最后将炉内的温度降至140℃,持续30min,取出在空气中自然冷却;S4, tempering treatment: the quenched bearing steel is first frozen and then placed in a tempering furnace. The temperature in the furnace was raised to 150 ° C for 70 min, then the temperature in the furnace was raised to 180 ° C, continued at 40 ° C, and finally the temperature in the furnace was lowered to 140 ° C for 30 min, and taken out and naturally cooled in the air;
S5,保温处理:将S4中冷却后的轴承钢放入保温箱中,在120℃的温度下保温5h即可完成热处理。S5, heat preservation treatment: the bearing steel cooled in S4 is placed in an incubator, and the heat treatment is completed by holding at a temperature of 120 ° C for 5 hours.
本发明的轴承钢热处理工艺操作方便,热处理后的轴承钢相对于传统的工艺处理后轴承钢具有强度高、硬度高的优点,更加耐磨和抗疲劳,性能得到提高。The heat treatment process of the bearing steel of the invention is convenient to operate, and the bearing steel after the heat treatment has the advantages of high strength and high hardness compared with the traditional processed bearing steel, is more wear-resistant and fatigue-resistant, and has improved performance.
以上所述,仅为本发明较佳的具体实施方式,但本发明的保护范围并不局限于此,任何熟悉本技术领域的技术人员在本发明揭露的技术范围内,根据本发明的技术方案及其发明构思加以等同替换或改变,都应涵盖在本发明的保护范围之内。 The above is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any technical person skilled in the art within the technical scope disclosed by the present invention, the technical solution according to the present invention Equivalent substitutions or modifications of the inventive concept are intended to be included within the scope of the invention.

Claims (6)

  1. 一种轴承钢热处理工艺,其特征在于,包括以下步骤:A bearing steel heat treatment process is characterized in that it comprises the following steps:
    S1,正火处理:将炉内的温度升至450-650℃,将轴承钢放入炉中,将炉内的温度以20-30℃/h的速度升至720-820℃,保温1-2h,轴承钢出炉在空气中通过风扇冷却;S1, normalizing treatment: raise the temperature in the furnace to 450-650 ° C, put the bearing steel into the furnace, raise the temperature in the furnace to 720-820 ° C at 20-30 ° C / h, keep warm 1- 2h, the bearing steel is cooled in the air by a fan;
    S2,退火处理:轴承钢在炉中加热到520-680℃,保温0.5-1h,再将炉内的温度以30-40℃/h的速度降至500-550℃,保温0.5-1h后,将炉内的温度以20-30℃/h的速度升至700-800℃,最后将炉内的温度以50-60℃/h的速度降至500-600℃,随炉冷却;S2, annealing treatment: the bearing steel is heated to 520-680 ° C in the furnace, the temperature is kept for 0.5-1 h, and then the temperature in the furnace is lowered to 500-550 ° C at a rate of 30-40 ° C / h, after 0.5-1 h of heat preservation, Raise the temperature in the furnace to 700-800 ° C at a rate of 20-30 ° C / h, and finally reduce the temperature in the furnace to 500-600 ° C at a rate of 50-60 ° C / h, and cool with the furnace;
    S3,淬火处理:将轴承钢在炉中加热到温度为300-500℃,保温0.5-1h后,取出轴承钢并在油中淬火,油的温度为120-200℃,持续10-30min;S3, quenching treatment: the bearing steel is heated in the furnace to a temperature of 300-500 ° C, after 0.5-1 h of heat preservation, the bearing steel is taken out and quenched in oil, the temperature of the oil is 120-200 ° C, lasting 10-30 min;
    S4,回火处理:将淬火后的轴承钢先冷冻处理,再置于回火炉中,将炉内的温度升到100-150℃,持续40-70min,随后将炉内的温度升至160-180℃,持续20-40℃,最后将炉内的温度降至90-140℃,持续10-30min,取出在空气中自然冷却;S4, tempering treatment: the quenched bearing steel is first frozen and then placed in a tempering furnace, the temperature in the furnace is raised to 100-150 ° C for 40-70 min, and then the temperature in the furnace is raised to 160- 180 ° C, lasting 20-40 ° C, and finally reduce the temperature in the furnace to 90-140 ° C for 10-30 min, take out and cool naturally in the air;
    S5,保温处理:将S4中冷却后的轴承钢放入保温箱中,在100-120℃的温度下保温3-5h即可完成热处理。S5, heat preservation treatment: the bearing steel cooled in S4 is placed in an incubator, and the heat treatment is completed by holding at a temperature of 100-120 ° C for 3-5 hours.
  2. 根据权利要求1所述的一种轴承钢热处理工艺,其特征在于,所述S1中,风扇设置在轴承钢的四周。A heat treatment process for a bearing steel according to claim 1, wherein in the S1, the fan is disposed around the bearing steel.
  3. 根据权利要求1所述的一种轴承钢热处理工艺,其特征在于,所述S1中,风扇等间距设置在轴承钢的一侧。A heat treatment process for a bearing steel according to claim 1, wherein in the S1, the fan is equidistantly disposed on one side of the bearing steel.
  4. 根据权利要求1所述的一种轴承钢热处理工艺,其特征在于, 所述S2中,轴承钢在炉中加热到600℃,保温0.75h,再将炉内的温度以35℃/h的速度降至525℃,保温0.75h后,将炉内的温度以25℃/h的速度升至750℃,最后将炉内的温度以55℃/h的速度降至550℃,随炉冷却。A heat treatment process for a bearing steel according to claim 1, wherein In the S2, the bearing steel is heated to 600 ° C in the furnace, the temperature is maintained for 0.75 h, and the temperature in the furnace is lowered to 525 ° C at a rate of 35 ° C / h. After the temperature is maintained for 0.75 h, the temperature in the furnace is 25 ° C. The speed of /h rises to 750 ° C, and finally the temperature in the furnace is lowered to 550 ° C at a rate of 55 ° C / h, and is cooled with the furnace.
  5. 根据权利要求1所述的一种轴承钢热处理工艺,其特征在于,所述S3中,将轴承钢在炉中加热到温度为400℃,保温0.75h后,取出轴承钢并在油中淬火,油的温度为160℃,持续20min。The heat treatment process for a bearing steel according to claim 1, wherein in the S3, the bearing steel is heated in the furnace to a temperature of 400 ° C, and after the heat is maintained for 0.75 h, the bearing steel is taken out and quenched in the oil. The temperature of the oil was 160 ° C for 20 min.
  6. 根据权利要求1所述的一种轴承钢热处理工艺,其特征在于,所述S4中,冷冻处理为:将轴承钢置于-140℃到-90℃之间的温度下进行冷冻处理。 A heat treatment process for a bearing steel according to claim 1, wherein in said S4, the freezing treatment is: freezing the bearing steel at a temperature between -140 ° C and -90 ° C.
PCT/CN2016/109272 2016-12-09 2016-12-09 Bearing steel heat treatment process WO2018103088A1 (en)

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CN112442584A (en) * 2020-11-23 2021-03-05 湖州南浔中盛金属热处理有限公司 Heat treatment process of seamless steel pipe for automobile semi-hanging shaft
CN112481477A (en) * 2020-10-28 2021-03-12 江麓机电集团有限公司 Heat treatment method of 30CrMnSiA thin steel plate fine punching part

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CN105714058A (en) * 2014-12-05 2016-06-29 青岛泰威机床有限公司 Thermal treatment process for bearing steel gauge blocks
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CN112481477A (en) * 2020-10-28 2021-03-12 江麓机电集团有限公司 Heat treatment method of 30CrMnSiA thin steel plate fine punching part
CN112442584A (en) * 2020-11-23 2021-03-05 湖州南浔中盛金属热处理有限公司 Heat treatment process of seamless steel pipe for automobile semi-hanging shaft

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