CN108277326A - A kind of Quick spheroidizing annealing technology method of GCr15 bearing steels - Google Patents
A kind of Quick spheroidizing annealing technology method of GCr15 bearing steels Download PDFInfo
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- CN108277326A CN108277326A CN201810318301.7A CN201810318301A CN108277326A CN 108277326 A CN108277326 A CN 108277326A CN 201810318301 A CN201810318301 A CN 201810318301A CN 108277326 A CN108277326 A CN 108277326A
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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
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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
- 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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—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
Abstract
A kind of Quick spheroidizing annealing technology method of GCr15 bearing steels, belongs to technical field of heat treatment.This method is the GCr15 bearing steels after hot rolling, is initially made annealing treatment, cools to room temperature with the furnace；By the GCr15 bearing steels 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 steels after being rolled, it is placed in again in the through heat-treatment furnace in both ends, in 800~850 DEG C of 0.5~1h of isothermal processes, obtain the GCr15 bearing steels after 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 steels of online Fast Spheroidizing Annealing.This method effectively controls the size of proeutectoid carbide, and more nucleation sites are provided for the precipitation of cementite in During Eutectoid Decomposition, to effectively shorten the spheroidizing required time, improves efficiency.
Description
Technical field
The invention belongs to technical field of heat treatment, more particularly to a kind of Quick spheroidizing annealing technology side of GCr15 bearing steels
Method.
Background technology
GCr15 bearing steels have higher fatigue performance, abrasion resistance properties and good size steady during being on active service
Qualitative, therefore, GCr15 bearing steels are 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 can cause the bearing steel after hot rolling treatment to have higher hardness, 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 be 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 is mainly the following：
(1) continuous spheroidizing annealing
Steel is heated to slightly above Ac1(such as GCr15 bearing steels are 780~810 DEG C) held for some time, then in stove
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 generally used 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 soonr1Below 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 take still above
10h。
(3) period spheroidizing
Steel is heated to slightly above Ac1It is kept the temperature, is then cooled to A soonr1It keeps the temperature below, is again heated to A laterc1The above temperature
Degree heat preservation, is then cooled to A soon 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 are time-consuming longer, energy consumption is larger.Period
Although spheroidizing solves the problems, such as that spheroidizing takes in the process longer, but technical process is more complicated, is unfavorable for reality
Border operates.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.For the more hypereutectoid steel of 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 to which the transition mechanisms for growing the turn model of pearlite from traditional sheet cooperation are changed into " divorced eutectoid transformation "
Variable mechanism, to accelerate the transition process of entire nodularization.
Invention content
For the technique of existing GCr15 bearing steels 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 steels, 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 spheroidizing required time, improve efficiency.
A kind of Quick spheroidizing annealing technology method of GCr15 bearing steels of the present invention, includes the following steps：
Step 1, initial annealing
It by the GCr15 bearing steels after hot rolling, is initially made annealing treatment, cools to room temperature with the furnace and initially made annealing treatment
GCr15 bearing steels afterwards；
Step 2, ausrolling is handled
The GCr15 bearing steels after initial annealing are 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 steels, wherein the overall reduction of rolling be 10%~30%；
Step 3, isothermal processes
By the GCr15 bearing steels 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, obtain the GCr15 bearing steels after isothermal processes；
Step 4, cooling treatment
By the GCr15 bearing steels after isothermal processes, 720~750 DEG C are cooled to the furnace, after 0.5~2h of isothermal, with furnace cooling
But to 550~650 DEG C, it is air-cooled to room temperature, obtains the GCr15 bearing steels of online Fast Spheroidizing Annealing.
In the step 1, the technique initially annealed is：GCr15 bearing steels are 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 mass percent of the GCr15 bearing steels, the element contained and each element is：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 globular carbide particle for being organized as thin ferrite and small and dispersed of GCr15 bearing steels prepared by the present invention, ball
Can be reached by changing grade by 1 grade, and average hardness is 190~195HV.
A kind of Quick spheroidizing annealing technology method of GCr15 bearing steels of the present invention, technical principle are：By in 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 be carried 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 steels of the present invention, it is only necessary at shorter follow-up nodularization
The reason time can form better spherodized structure.From metallographic structure observation analysis, thin iron element is organized as after spheroidizing
The globular carbide particle of body and small and dispersed, nodulizing grade can reach 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, and production efficiency is high；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.
Description of the drawings
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 implementation mode
With reference to embodiment, the present invention is described in further detail.
In following embodiment, refined by northeast Fushun Special Steel Shares Co., Ltd of special steel group using GCr15 bearing steels,
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 steels
Size is 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 developments 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 furnaces 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 microscopes.
In following embodiment, equipment that the test of hardness performance uses produces micro- for FUTURE-TECH companies of Japan
Hardometer, the load used is 50gf.
In following embodiment, nodularization effect ranking is with reference to GB/T18254-2002 standards, and the image used is Olympic
The metallographic structure of Bath BX53MRF type metallographic microscopes shooting.
Embodiment 1
A kind of Quick spheroidizing annealing technology method of GCr15 bearing steels, carries out according to the following steps：
Step 1, initial annealing
By the GCr15 bearing steels after hot rolling, it is placed in high temperature box type resistance furnace and is initially made annealing treatment, initially annealed
Treated GCr15 bearing steels；Wherein, initial annealing process is：GCr15 bearing steels are heated to 1200 DEG C, isothermal 60min,
Cool to room temperature with the furnace；
Step 2, ausrolling is handled
By the GCr15 bearing steels 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 steels after being rolled, wherein rolling pressure
Amount is 20%；
Step 3, isothermal processes
It by the GCr15 bearing steels after rolling, then is placed in the through heat-treatment furnace in east, west, is carried out at isothermal at 820 DEG C
Reason, isothermal time 0.5h obtain the GCr15 bearing steels after isothermal processes；
Step 4, cooling treatment
By the GCr15 bearing steels 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 steels of online Fast Spheroidizing Annealing.
To GCr15 bearing steels manufactured in the present embodiment, metallographic group is carried out using Olympus BX53MRF type metallographic microscopes
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 standards
Nodularization is rated 1 grade, and microhardness is about 195HV.Isothermal time shorten to 2.5h required for improved spheroidizing.
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 steels is：By the GCr15 bearing steels after hot rolling after initially making annealing treatment,
Sample is put into east, the through heat-treatment furnace in west and is heated to 820 DEG C, 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 microscopes 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 standards
Shape is rated 1 grade, microhardness 198HV.
Comparative example 2
A kind of method for annealing of GCr15 bearing steels, 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 microscopes
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 standards 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 steels, with embodiment 1, difference is specific experimental method：820 DEG C etc.
After temperature processing 0.5h, it is 40% to carry out single pass deformation drafts, 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 microscopes is as shown in figure 4, only in original austenite crystal prevention week
It encloses there are a small amount of globular carbide, 2 grades is rated according to the metallographic structure carbide network in GB/T18254-2002 standards, 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 steels, 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 microscopes 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 standards
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 steels, carries out according to the following steps：
Step 1, initial annealing
By the GCr15 bearing steels after hot rolling, it is placed in high temperature box type resistance furnace and is initially made annealing treatment, initially annealed
Treated GCr15 bearing steels；Wherein, initial annealing process is：GCr15 bearing steels are heated to 1000 DEG C, isothermal 100min,
Cool to room temperature with the furnace；
Step 2, ausrolling is handled
By the GCr15 bearing steels 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 steels after being rolled, wherein rolling stagnation pressure
Lower amount is 30%；
Step 3, isothermal processes
It by the GCr15 bearing steels after rolling, then is placed in the through heat-treatment furnace in east, west, is carried out at isothermal at 800 DEG C
Reason, isothermal time 0.5h obtain the GCr15 bearing steels after isothermal processes；
Step 4, cooling treatment
By the GCr15 bearing steels 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 steels of online Fast Spheroidizing Annealing.
The metallographic structure obtained by Olympus BX53MRF type metallographic microscopes is as shown in fig. 6, only in original austenite crystalline substance
There are a small amount of globular carbides around boundary, and 1 is rated according to the metallographic structure carbide network in GB/T18254-2002 standards
Grade, microhardness 190HV.
Embodiment 3
A kind of Quick spheroidizing annealing technology method of GCr15 bearing steels, carries out according to the following steps：
Step 1, initial annealing
By the GCr15 bearing steels after hot rolling, it is placed in high temperature box type resistance furnace and is initially made annealing treatment, initially annealed
Treated GCr15 bearing steels；Wherein, initial annealing process is：GCr15 bearing steels are heated to 1100 DEG C, isothermal 90min,
Cool to room temperature with the furnace；
Step 2, ausrolling is handled
By the GCr15 bearing steels 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 steels after being rolled, wherein rolling pressure
Lower amount is 10%；
Step 3, isothermal processes
It by the GCr15 bearing steels after rolling, then is placed in the through heat-treatment furnace in east, west, is carried out at isothermal at 850 DEG C
Reason, isothermal time 1h obtain the GCr15 bearing steels after isothermal processes；
Step 4, cooling treatment
By the GCr15 bearing steels 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 steels of online Fast Spheroidizing Annealing.
The metallographic structure obtained by Olympus BX53MRF type metallographic microscopes is as shown in fig. 7, only in original austenite crystalline substance
There are a small amount of globular carbides around boundary, and 1 is rated according to the metallographic structure carbide network in GB/T18254-2002 standards
Grade, microhardness 192HV.
Claims (5)
1. a kind of Quick spheroidizing annealing technology method of GCr15 bearing steels, which is characterized in that include the following steps：
Step 1, initial annealing
It by the GCr15 bearing steels after hot rolling, is initially made annealing treatment, is cooled to the furnace after room temperature initially made annealing treatment
GCr15 bearing steels；
Step 2, ausrolling is handled
By the GCr15 bearing steels after initial annealing, it is placed in the through heat-treatment furnace in both ends, 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 being rolled
GCr15 bearing steels, wherein the overall reduction of rolling is 10%~30%；
Step 3, isothermal processes
It by the GCr15 bearing steels after rolling, then is placed in the through heat-treatment furnace in both ends, is carried out at isothermal at 800~850 DEG C
Reason, isothermal time are 0.5h~1h, obtain the GCr15 bearing steels after isothermal processes；
Step 4, cooling treatment
By the GCr15 bearing steels after isothermal processes, 720~750 DEG C are cooled to the furnace, after 0.5~2h of isothermal, cooling to the furnace
550~650 DEG C, it is air-cooled to room temperature, obtains the GCr15 bearing steels of online Fast Spheroidizing Annealing.
2. the Quick spheroidizing annealing technology method of GCr15 bearing steels as described in claim 1, which is characterized in that the step
In rapid 1, the technique initially annealed is：GCr15 bearing steels are heated to 1000~1200 DEG C, 60~100min of isothermal,
Cool to room temperature with the furnace.
3. the Quick spheroidizing annealing technology method of GCr15 bearing steels as described in claim 1, which is characterized in that the step
In rapid 1, the equipment that the initial annealing process uses is high temperature box type resistance furnace.
4. the Quick spheroidizing annealing technology method of GCr15 bearing steels as described in claim 1, which is characterized in that described
The mass percent of GCr15 bearing steels, the element contained and each element is：C be 0.95%~1.05%, Cr be 1.30%~
1.65%, Si are that 0.15%~0.35%, Mn is 0.2%~0.4%, Ni≤0.3%, S≤0.02%, P≤0.027%, Cu
≤ 0.25%, Ti 0.005%, Mo are that 0.04~0.05%%, Al is 0.01%~0.02%, and surplus is for Fe and unavoidably
Impurity.
5. the Quick spheroidizing annealing technology method of GCr15 bearing steels as described in claim 1, which is characterized in that preparation
The globular carbide particle for being organized as thin ferrite and small and dispersed of GCr15 bearing steels, nodulizing grade can reach 1 grade, put down
Equal hardness is 190~195HV.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109097547A (en) * | 2018-09-19 | 2018-12-28 | 成都天马铁路轴承有限公司 | A kind of forging of railway bearing seal receptacle and rta technique |
| CN110283975A (en) * | 2019-08-02 | 2019-09-27 | 东北大学 | The method that rolling-isothermal spheroidizing processing prepares GCr15 bearing steel |
| CN110899648A (en) * | 2019-11-08 | 2020-03-24 | 河钢股份有限公司 | Continuous casting method for improving internal quality of bearing steel continuous casting billet |
| CN113337693A (en) * | 2021-06-28 | 2021-09-03 | 建龙北满特殊钢有限责任公司 | Heat treatment method for reducing steel-mesh carbide level of large-size bearing |
| CN113832311A (en) * | 2021-09-30 | 2021-12-24 | 北京科技大学 | Method for producing rapid spheroidizing special steel |
| CN114480797A (en) * | 2022-01-27 | 2022-05-13 | 石狮市汇星机械有限公司 | Heat treatment process method for producing knitting machine cam by using GCr15 steel |
| CN115094208A (en) * | 2022-06-24 | 2022-09-23 | 江苏联峰能源装备有限公司 | Rapid isothermal spheroidizing annealing method for 42CrMoA steel |
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| CN109097547A (en) * | 2018-09-19 | 2018-12-28 | 成都天马铁路轴承有限公司 | A kind of forging of railway bearing seal receptacle and rta technique |
| CN110283975A (en) * | 2019-08-02 | 2019-09-27 | 东北大学 | The method that rolling-isothermal spheroidizing processing prepares GCr15 bearing steel |
| WO2021022542A1 (en) * | 2019-08-02 | 2021-02-11 | 东北大学 | Preparation method for gcr15 bearing steel by rolling-isothermal spheroidizing annealing treatment |
| CN110899648A (en) * | 2019-11-08 | 2020-03-24 | 河钢股份有限公司 | Continuous casting method for improving internal quality of bearing steel continuous casting billet |
| CN113337693A (en) * | 2021-06-28 | 2021-09-03 | 建龙北满特殊钢有限责任公司 | Heat treatment method for reducing steel-mesh carbide level of large-size bearing |
| CN113337693B (en) * | 2021-06-28 | 2023-05-26 | 建龙北满特殊钢有限责任公司 | Heat treatment method for reducing grade of large-size bearing steel net-shaped carbide |
| CN113832311A (en) * | 2021-09-30 | 2021-12-24 | 北京科技大学 | Method for producing rapid spheroidizing special steel |
| CN114480797A (en) * | 2022-01-27 | 2022-05-13 | 石狮市汇星机械有限公司 | Heat treatment process method for producing knitting machine cam by using GCr15 steel |
| CN115094208A (en) * | 2022-06-24 | 2022-09-23 | 江苏联峰能源装备有限公司 | Rapid isothermal spheroidizing annealing method for 42CrMoA steel |
| CN115094208B (en) * | 2022-06-24 | 2024-04-26 | 江苏联峰能源装备有限公司 | Rapid isothermal spheroidizing annealing method for 42CrMoA steel |
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