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CN108277326B - A kind of Quick spheroidizing annealing technology method of GCr15 bearing steel - Google Patents

A kind of Quick spheroidizing annealing technology method of GCr15 bearing steel Download PDF

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CN108277326B
CN108277326B CN201810318301.7A CN201810318301A CN108277326B CN 108277326 B CN108277326 B CN 108277326B CN 201810318301 A CN201810318301 A CN 201810318301A CN 108277326 B CN108277326 B CN 108277326B
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bearing steel
gcr15 bearing
furnace
isothermal
treatment
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CN108277326A (en
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韩东序
杜林秀
董营
张彬
吴红艳
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Northeastern University China
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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
    • C21D1/26—Methods of annealing
    • C21D1/32—Soft annealing, e.g. spheroidising
    • 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
    • C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous 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
    • C22C38/02—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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
    • 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

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)
  • Heat Treatment Of Articles (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

A kind of Quick spheroidizing annealing technology method of GCr15 bearing steel, belongs to technical field of heat treatment.This method is the GCr15 bearing steel after hot rolling, is initially made annealing treatment, cools to room temperature with the furnace；By the GCr15 bearing steel after initial annealing, it is placed in the through heat-treatment furnace in both ends, after being heated to 800~850 DEG C of 0.5~1h of isothermal processes, it is rolled again, GCr15 bearing steel after being rolled, it is placed in the through heat-treatment furnace in both ends again, in 800~850 DEG C of 0.5~1h of isothermal processes, GCr15 bearing steel after obtaining isothermal processes, it cools to 720~750 DEG C with the furnace, after 0.5~2h of isothermal, is cooling to 550~650 DEG C with the furnace, it is air-cooled to room temperature, obtains the GCr15 bearing steel of online Fast Spheroidizing Annealing.This method effectively controls the size of proeutectoid carbide, provides more nucleation sites for the precipitation of cementite in During Eutectoid Decomposition, to effectively shorten the time required for spheroidizing, improves efficiency.

Description

A kind of Quick spheroidizing annealing technology method of GCr15 bearing steel
Technical field
The invention belongs to technical field of heat treatment, in particular to a kind of Quick spheroidizing annealing technology side of GCr15 bearing steel Method.
Background technique
GCr15 bearing steel fatigue performance with higher, abrasion resistance properties and good size during military service is steady Qualitative, therefore, GCr15 bearing steel is in Production of bearing in the market always in occupation of leading status.However as a kind of hypereutectoid Steel, since phosphorus content is higher, after hot rolling and air cooling is handled, the tissue of GCr15 is by lamellar pearlite and in original austenite crystal prevention The net carbide of upper precipitation forms, and this line and staff control will lead to the bearing steel hardness with higher after hot rolling treatment, no Conducive to the progress of subsequent mechanical working process.In order to reduce hardness of the bearing steel before machining processes, internal stress is reduced, one As spheroidizing processing will be carried out before machining processes, make structural transformation with the spherical of relatively good processing performance Pearlitic structrure.Although although the research of the Quick spheroidizing annealing technology of bearing steel achieve in recent years it is a degree of into Step, but existing spheriodization process thereof remains the problems such as production cycle is long, production process is complicated at this stage.At this stage, The technique of the spheroidizing of industrial common bearing steel mainly include the following types:
(1) continuous spheroidizing annealing
Steel is heated to slightly above Ac1(such as GCr15 bearing steel is 780~810 DEG C) held for some time, then in furnace With the cooling velocity of 15~25 DEG C/h be cooled to 650 DEG C or less come out of the stove it is air-cooled.Using continuous spheroidizing annealing process bearing steel Heat treatment time used is up to 20h or more, and therefore, in order to raise labour productivity, continuous spheroidizing annealing technique is raw in industry Use in production is not extensive.
(2) isothermal spheroidizing
Isothermal spheroidizing is the spheronization process generallyd use in industrial production at this stage.Specific operating method is as follows: Steel is heated to slightly above Ac1Held for some time is then cooled to A fastlyr1Below in a certain temperature range (680~720 DEG C) into Row isothermal transformation, during isothermal transformation, austenite phase can be changed into ferrite+carbide particle, then furnace cooling It comes out of the stove to 650 DEG C air-cooled.It is shorter the time required to isothermal spheroidizing technique compared with continuous spheroidizing annealing, but it is time-consuming still above 10h。
(3) period spheroidizing
Steel is heated to slightly above Ac1It is kept the temperature, is then cooled to A fastlyr1It keeps the temperature below, is again heated to A laterc1The above temperature Degree heat preservation, is then cooled to A fastly againr1Keep the temperature below, repeatedly repeatedly before heat treatment process, after finally cooling to 650 DEG C with the furnace It comes out of the stove air-cooled.The technique nodularization effect is abundant, but technological operation is relatively complicated.
Traditional annealing process, if continuous spheroidizing annealing and isothermal spheroidizing take a long time, energy consumption is larger.Period Although spheroidizing solves the problems, such as to take a long time during spheroidizing, but technical process is more complicated, is unfavorable for reality Border operation.Therefore, a kind of new rolling and heat treatment process are developed, the online nodularization of GCr15 steel is realized, by easy operative employee Skill and shortening nodularization time organically combine, and have very important scientific meaning and economic benefit.
On this basis, realize that fast spheroidizing annealing is widely used in bearing ball annealing using divorced-eutectoid transformation mechanism In research.The hypereutectoid steel more for phosphorus content, during eutectoid reaction, due to steel at branch farther out from eutectoid point, During temperature reduces, proeutectoid carbide can be higher than Ar3Point is precipitated, with further decreasing for temperature, eutectoid structure In meet to depend on to be precipitated on proeutectoid cementite with first cementite and grow up, and ferritic phase then can be in crystal boundary, phase boundary etc. It is precipitated, turns so that the turn model of pearlite is changed into " divorced eutectoid transformation " from the transition mechanisms that traditional sheet cooperation is grown Variable mechanism, to accelerate the transition process of entire nodularization.
Summary of the invention
For the technique of existing GCr15 bearing steel divorced eutectoid transformation spheroidising, the present invention is by isothermal deformation process and divorced Eutectoid reaction combines, and provides a kind of Quick spheroidizing annealing technology method of GCr15 bearing steel, by rolling temperature with And the Rational choice of rolling reduction increases the pro-eutectoid carbonization during divorced eutectoid transformation using the spheriodization process thereof of optimization While the precipitation quantity of object, the effective size for controlling proeutectoid carbide is the precipitation of cementite in During Eutectoid Decomposition More nucleation sites are provided, to effectively shorten the time required for spheroidizing, improve efficiency.
A kind of Quick spheroidizing annealing technology method of GCr15 bearing steel of the invention, comprising the following steps:
Step 1, initial annealing
It by the GCr15 bearing steel after hot rolling, is initially made annealing treatment, cools to room temperature with the furnace and initially made annealing treatment GCr15 bearing steel afterwards；
Step 2, ausrolling is handled
The GCr15 bearing steel after initial annealing is placed in the through heat-treatment furnace in both ends, it is heated to 800~ 850 DEG C, after isothermal processes 0.5h~1h, one-pass roller or two passes are carried out at 800~850 DEG C, after obtaining rolling GCr15 bearing steel, wherein the overall reduction of rolling be 10%~30%；
Step 3, isothermal processes
By the GCr15 bearing steel after rolling, then it is placed in the through heat-treatment furnace in both ends, carried out at 800~850 DEG C etc. Temperature processing, isothermal time are 0.5h~1h, the GCr15 bearing steel after obtaining isothermal processes；
Step 4, cooling treatment
By the GCr15 bearing steel after isothermal processes, 720~750 DEG C are cooled to the furnace, after 0.5~2h of isothermal, cold with furnace But to 550~650 DEG C, it is air-cooled to room temperature, obtains the GCr15 bearing steel of online Fast Spheroidizing Annealing.
In the step 1, the technique initially annealed are as follows: GCr15 bearing steel is heated to 1000~1200 DEG C, 60~100min of isothermal, cools to room temperature with the furnace.
In the step 1, the equipment that the initial annealing process uses is high temperature box type resistance furnace.
The GCr15 bearing steel, the mass percent of the element contained and each element are as follows: C be 0.95%~ It is 0.15%~0.35%, Mn is 0.2%~0.4%, Ni≤0.3% that 1.05%, Cr, which are 1.30%~1.65%, Si, S≤ 0.02%, P≤0.027%, Cu≤0.25%, Ti 0.005%, Mo be 0.04~0.05%%, Al be 0.01%~ 0.02%, surplus is Fe and inevitable impurity.
The tissue of GCr15 bearing steel prepared by the present invention is the globular carbide particle of thin ferrite and small and dispersed, ball Changing grade can achieve 1 grade, and average hardness is 190~195HV.
A kind of Quick spheroidizing annealing technology method of GCr15 bearing steel of the invention, technical principle is: by tradition Divorced eutectoid transformation isothermal temperature region in carry out rolling deformation, since the isothermal temperature of divorced eutectoid transformation is in Ac1And AccmBetween, Deformation in this temperature range can not only reduce the particle size of carbide in basic stitch, but also can induce more carbide It is precipitated in this temperature range.The carbide particle of precipitation can become new ball in subsequent 720~750 DEG C of constant temperature process The nucleation point of shape Carbide Precipitation promotes perlitic transformation to carry out in the form of divorced eutectoid transformation, to form globular pearlite group It knits.It should be noted that the rolling deformation in divorced eutectoid transformation temperature range needs the deformation using small deformation amount, deformation Amount should be controlled 10%~30%, and rolling pass is not easy too much, rolling pass control≤twice, in this way could effectively Globular carbide is promoted effectively to be precipitated in transgranular and crystal boundary, rather than the excessive crystal boundary that is gathered in forms new net carbide.
The Quick spheroidizing annealing technology method of a kind of GCr15 bearing steel of the invention, it is only necessary at shorter subsequent nodularization The reason time can form better spherodized structure.From metallographic structure observation analysis, the tissue after spheroidizing is thin iron element The globular carbide particle of body and small and dispersed, nodulizing grade can achieve 1 grade, and hardness 195HV, hardness has also reached use It is required that.Compared with traditional annealing process, isothermal time is short, and low energy consumption, high production efficiency；With novel two-phase low temp area Rolling is compared, and rolling temperature is higher, and rolling drag is smaller, has important actual production meaning.
Detailed description of the invention
Fig. 1 is treated the metallographic structure micrograph of the embodiment of the present invention 1.
Fig. 2 is comparative example 1 of the present invention treated metallographic structure micrograph.
Fig. 3 is comparative example 2 of the present invention treated metallographic structure micrograph.
Fig. 4 is comparative example 3 of the present invention treated metallographic structure micrograph.
Fig. 5 is comparative example 4 of the present invention treated metallographic structure micrograph.
Fig. 6 is treated the metallographic structure micrograph of the embodiment of the present invention 2.
Fig. 7 is treated the metallographic structure micrograph of the embodiment of the present invention 3.
Specific embodiment
Below with reference to embodiment, the present invention is described in further detail.
In following embodiment, refined using GCr15 bearing steel by northeast Fushun Special Steel Shares Co., Ltd, special steel group, Percentage composition is C1%, Cr1.51%, Si0.22%, Mn0.3%, Ni0.18%, S0.002%, P0.002%, Cu0.08%, Ti0.005%, Mo0.04%, Al0.02%, surplus are Fe and inevitable impurity.Before the rolling of GCr15 bearing steel Having a size of 25mm × 30mm × 150mm.
In following embodiment, the milling train used in course of hot rolling is 400 New-type asynchronous of Northeastern University's RAL independent development warm Roll experimental mill.
In following embodiment, the resistance furnace of use is respectively the east RX-36-10 of Shenyang general purpose electric stove factory production, west perforation Converge the HL07-22 high temperature box type resistance furnace that electric furnace Co., Ltd produces for formula heat-treatment furnace and Shanghai.
In following embodiment, the equipment for observing metallographic structure is Olympus BX53MRF type metallographic microscope.
In following embodiment, the equipment that the test of hardness performance uses produces micro- for FUTURE-TECH company, Japan Hardometer, the load used is 50gf.
In following embodiment, nodularization effect ranking is referring to GB/T18254-2002 standard, and the image used is Olympic The metallographic structure of Bath BX53MRF type metallographic microscope shooting.
Embodiment 1
A kind of Quick spheroidizing annealing technology method of GCr15 bearing steel, sequentially includes the following steps:
Step 1, initial annealing
By the GCr15 bearing steel after hot rolling, it is placed in high temperature box type resistance furnace and is initially made annealing treatment, initially annealed Treated GCr15 bearing steel；Wherein, initial annealing process are as follows: GCr15 bearing steel is heated to 1200 DEG C, isothermal 60min, Cool to room temperature with the furnace；
Step 2, ausrolling is handled
By the GCr15 bearing steel after initial annealing, it is placed in the through heat-treatment furnace in east, west, is heated to 820 DEG C, after isothermal processes 1h, one-pass roller is carried out at 820 DEG C, the GCr15 bearing steel after being rolled, wherein rolling pressure Amount is 20%；
Step 3, isothermal processes
It by the GCr15 bearing steel after rolling, then is placed in the through heat-treatment furnace in east, west, at 820 DEG C of progress isothermals Reason, isothermal time 0.5h, the GCr15 bearing steel after obtaining isothermal processes；
Step 4, cooling treatment
By the GCr15 bearing steel after isothermal processes, 720 DEG C are cooled to the furnace, after isothermal 0.5h, cooling to 600 with the furnace DEG C, it is air-cooled to room temperature, obtains the GCr15 bearing steel of online Fast Spheroidizing Annealing.
To GCr15 bearing steel manufactured in the present embodiment, metallographic group is carried out using Olympus BX53MRF type metallographic microscope Observation is knitted, the metallographic structure after the spheroidising of acquisition is as shown in Figure 1, according to the metallographic structure in GB/T18254-2002 standard Nodularization is rated 1 grade, and microhardness is about 195HV.Isothermal time required for improved spheroidizing shorten to 2.5h.
Comparative example 1
Comparative example 1 is that common divorced eutectoid transformation spheroidizing method, spheroidizing isothermal time used are 4h now.Its The divorced eutectoid transformation spheroidizing method of GCr15 bearing steel are as follows: by the GCr15 bearing steel after hot rolling after initially making annealing treatment, Sample is put into east, is heated to 820 DEG C in the through heat-treatment furnace in west, after isothermal processes 2h, is furnace-cooled to 720 DEG C, after isothermal 2h It is furnace-cooled to 600 DEG C, it is air-cooled.The metallographic structure obtained by Olympus BX53MRF type metallographic microscope is as shown in Fig. 2, only exist There are a small amount of globular carbides around original austenite crystal prevention, according to the metallographic structure carbide network in GB/T18254-2002 standard Shape is rated 1 grade, microhardness 198HV.
Comparative example 2
A kind of method for annealing of GCr15 bearing steel, with embodiment 1, difference is specific experimental method: initial annealing Treated sample isothermal 2h after high temperature box type resistance furnace is heated to 820 DEG C, during this period without rolling deformation processing, isothermal It is furnace-cooled to 720 DEG C after processing, is furnace-cooled to 600 DEG C after isothermal 0.5h again, it is air-cooled.Pass through Olympus BX53MRF type metallography microscope The metallographic structure that mirror obtains is as shown in figure 3, only there are a small amount of globular carbides around original austenite crystal prevention, according to GB/ Metallographic structure carbide network in T18254-2002 standard is rated 2 grades, microhardness 207HV.The explanation of comparative example 2 does not have There is rolling deformation processing, individually cannot achieve good nodularization in 720 DEG C of isothermal processes 0.5h.
Comparative example 3
A kind of method for annealing of GCr15 bearing steel, with embodiment 1, difference is specific experimental method: 820 DEG C etc. After temperature processing 0.5h, carrying out single pass deformation drafts is 40%, will then roll rear steel plate and be put into east, the through heat-treatment furnace in west Middle carry out isothermal processes, isothermal temperature are 820 DEG C, isothermal 0.5h, are furnace-cooled to 720 DEG C, 600 DEG C are furnace-cooled to after isothermal 0.5h, sky It is cold.The metallographic structure obtained by Olympus BX53MRF type metallographic microscope is as shown in figure 4, only in original austenite crystal prevention week It encloses there are a small amount of globular carbide, is rated 2 grades according to the metallographic structure carbide network in GB/T18254-2002 standard, show Microhardness is 215HV.If comparative example 3 illustrates that drafts is excessive, the progress of nodularization process can be hindered instead.
Comparative example 4
A kind of method for annealing of GCr15 bearing steel, with embodiment 1, difference is specific experimental method: 820 DEG C etc. After temperature processing 0.5h, three passes deformations are carried out, overall reduction 20%, then rolling rear steel plate, to be put into east, west through Isothermal processes are carried out in heat-treatment furnace, isothermal temperature is 820 DEG C, isothermal 1.5h, is furnace-cooled to 720 DEG C, is furnace-cooled to after isothermal 0.5h It is 600 DEG C, air-cooled.The metallographic structure obtained by Olympus BX53MRF type metallographic microscope is as shown in figure 5, only in former Ovshinsky There are a small amount of globular carbides around body crystal boundary, are graded according to the metallographic structure carbide network in GB/T18254-2002 standard It is 2 grades, microhardness 218HV.Comparative example 4 illustrates that the rolling of multi-pass can also hinder the progress of nodularization process.
Embodiment 2
A kind of Quick spheroidizing annealing technology method of GCr15 bearing steel, sequentially includes the following steps:
Step 1, initial annealing
By the GCr15 bearing steel after hot rolling, it is placed in high temperature box type resistance furnace and is initially made annealing treatment, initially annealed Treated GCr15 bearing steel；Wherein, initial annealing process are as follows: GCr15 bearing steel is heated to 1000 DEG C, isothermal 100min, Cool to room temperature with the furnace；
Step 2, ausrolling is handled
By the GCr15 bearing steel after initial annealing, it is placed in the through heat-treatment furnace in east, west, is heated to 800 DEG C, after isothermal processes 1h, two passes are carried out at 800 DEG C, the GCr15 bearing steel after being rolled, wherein rolling stagnation pressure Lower amount is 30%；
Step 3, isothermal processes
It by the GCr15 bearing steel after rolling, then is placed in the through heat-treatment furnace in east, west, at 800 DEG C of progress isothermals Reason, isothermal time 0.5h, the GCr15 bearing steel after obtaining isothermal processes；
Step 4, cooling treatment
By the GCr15 bearing steel after isothermal processes, 720 DEG C are cooled to the furnace, after isothermal 2h, cooling to 550 DEG C with the furnace, It is air-cooled to room temperature, obtains the GCr15 bearing steel of online Fast Spheroidizing Annealing.
The metallographic structure obtained by Olympus BX53MRF type metallographic microscope is as shown in fig. 6, only in original austenite crystalline substance There are a small amount of globular carbides around boundary, are rated 1 according to the metallographic structure carbide network in GB/T18254-2002 standard Grade, microhardness 190HV.
Embodiment 3
A kind of Quick spheroidizing annealing technology method of GCr15 bearing steel, sequentially includes the following steps:
Step 1, initial annealing
By the GCr15 bearing steel after hot rolling, it is placed in high temperature box type resistance furnace and is initially made annealing treatment, initially annealed Treated GCr15 bearing steel；Wherein, initial annealing process are as follows: GCr15 bearing steel is heated to 1100 DEG C, isothermal 90min, Cool to room temperature with the furnace；
Step 2, ausrolling is handled
By the GCr15 bearing steel after initial annealing, it is placed in the through heat-treatment furnace in east, west, is heated to 850 DEG C, after isothermal processes 0.5h, one-pass roller is carried out at 850 DEG C, the GCr15 bearing steel after being rolled, wherein rolling pressure Lower amount is 10%；
Step 3, isothermal processes
It by the GCr15 bearing steel after rolling, then is placed in the through heat-treatment furnace in east, west, at 850 DEG C of progress isothermals Reason, isothermal time 1h, the GCr15 bearing steel after obtaining isothermal processes；
Step 4, cooling treatment
By the GCr15 bearing steel after isothermal processes, 750 DEG C are cooled to the furnace, after isothermal 0.5h, cooling to 650 with the furnace DEG C, it is air-cooled to room temperature, obtains the GCr15 bearing steel of online Fast Spheroidizing Annealing.
The metallographic structure obtained by Olympus BX53MRF type metallographic microscope is as shown in fig. 7, only in original austenite crystalline substance There are a small amount of globular carbides around boundary, are rated 1 according to the metallographic structure carbide network in GB/T18254-2002 standard Grade, microhardness 192HV.

Claims (4)

1.一种GCr15轴承钢的快速球化退火工艺方法，其特征在于，包括以下步骤：1. a rapid spheroidizing annealing process method of GCr15 bearing steel, is characterized in that, comprises the following steps: 步骤1，初始退火处理Step 1, Initial Annealing Treatment 将热轧后的GCr15轴承钢，进行初始退火处理，随炉冷却至室温得到初始退火处理后的GCr15轴承钢；The hot-rolled GCr15 bearing steel is subjected to initial annealing treatment, and then cooled to room temperature with the furnace to obtain the GCr15 bearing steel after initial annealing treatment; 所述的初始退火的工艺为：将GCr15轴承钢加热至1000~1200℃，等温60~100min，随炉冷却至室温；The process of the initial annealing is: heating the GCr15 bearing steel to 1000-1200° C., isothermally for 60-100 minutes, and cooling to room temperature with the furnace; 步骤2，等温轧制处理Step 2, isothermal rolling treatment 将初始退火处理后的GCr15轴承钢，置于两端贯通式的热处理炉中，加热至800~850℃，等温处理0.5h~1h后，在800~850℃下进行单道次轧制或两道次轧制，得到轧制后的GCr15轴承钢，其中，轧制的总压下量为10%~30%；The GCr15 bearing steel after initial annealing treatment is placed in a heat treatment furnace with two ends passing through, heated to 800~850℃, and after isothermal treatment for 0.5h~1h, single-pass rolling or two-pass rolling is carried out at 800~850℃. Pass rolling to obtain rolled GCr15 bearing steel, wherein the total rolling reduction is 10% to 30%; 步骤3，等温处理Step 3, isothermal treatment 将轧制后的GCr15轴承钢，再置于两端贯通式的热处理炉中，在800~850℃进行等温处理，等温时间为0.5h~1h，得到等温处理后的GCr15轴承钢；The rolled GCr15 bearing steel is placed in a heat treatment furnace with two ends through, and the isothermal treatment is carried out at 800~850 ° C, and the isothermal time is 0.5h~1h to obtain the isothermally treated GCr15 bearing steel; 步骤4，冷却处理Step 4, cooling treatment 将等温处理后的GCr15轴承钢，随炉冷却至720~750℃，等温0.5~2h后，再随炉冷却至550~650℃，空冷至室温，得到在线快速球化退火的GCr15轴承钢。The isothermally treated GCr15 bearing steel is cooled to 720~750°C with the furnace, after isothermal for 0.5~2h, then cooled to 550~650°C with the furnace, and air-cooled to room temperature to obtain the GCr15 bearing steel with online rapid spheroidization annealing. 2.如权利要求1所述的GCr15轴承钢的快速球化退火工艺方法，其特征在于，所述的步骤1中，所述的初始退火工艺采用的设备为高温箱式电阻炉。2 . The rapid spheroidizing annealing process method of GCr15 bearing steel as claimed in claim 1 , wherein, in the step 1, the equipment used in the initial annealing process is a high temperature box-type resistance furnace. 3 . 3.如权利要求1所述的GCr15轴承钢的快速球化退火工艺方法，其特征在于，所述的GCr15轴承钢，含有的元素及各个元素的质量百分比为：C为0.95%~1.05%，Cr为1.30%~1.65%，Si为0.15%~0.35%，Mn为0.2%~0.4%，Ni≤0.3%，S≤0.02%，P≤0.027%，Cu≤0.25%，Ti为0.005%，Mo为0.04~0.05%，Al为0.01%~0.02%，余量为Fe和不可避免杂质。3. the rapid spheroidizing annealing process method of GCr15 bearing steel as claimed in claim 1, is characterized in that, described GCr15 bearing steel, the mass percent of the element that contains and each element is: C is 0.95%～1.05%, Cr is 1.30%~1.65%, Si is 0.15%~0.35%, Mn is 0.2%~0.4%, Ni≤0.3%, S≤0.02%, P≤0.027%, Cu≤0.25%, Ti is 0.005%, Mo It is 0.04~0.05%, Al is 0.01%~0.02%, and the balance is Fe and inevitable impurities. 4.如权利要求1所述的GCr15轴承钢的快速球化退火工艺方法，其特征在于，制备的GCr15轴承钢的组织为细铁素体及细小弥散的球状碳化物颗粒，球化等级可以达到1级，平均硬度为190~195HV。4. the rapid spheroidizing annealing process method of GCr15 bearing steel as claimed in claim 1 is characterized in that, the organization of the prepared GCr15 bearing steel is fine ferrite and finely dispersed spherical carbide particles, and the spheroidization grade can reach Grade 1, the average hardness is 190~195HV.
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