CN110283975A - The method that rolling-isothermal spheroidizing processing prepares GCr15 bearing steel - Google Patents

The method that rolling-isothermal spheroidizing processing prepares GCr15 bearing steel Download PDF

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CN110283975A
CN110283975A CN201910709590.8A CN201910709590A CN110283975A CN 110283975 A CN110283975 A CN 110283975A CN 201910709590 A CN201910709590 A CN 201910709590A CN 110283975 A CN110283975 A CN 110283975A
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rolling
isothermal
warm
furnace
cooled
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韩东序
杜林秀
杜预
高秀华
吴红艳
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Northeastern University China
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Northeastern University China
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Priority to PCT/CN2019/099770 priority patent/WO2021022542A1/en
Publication of CN110283975A publication Critical patent/CN110283975A/en
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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
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
    • 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
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • 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
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0231—Warm rolling
    • 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
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • 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
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • 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
    • C21D2211/005—Ferrite

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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)
  • Rolling Contact Bearings (AREA)
  • Heat Treatment Of Sheet Steel (AREA)

Abstract

A kind of method that rolling-isothermal spheroidizing processing prepares GCr15 bearing steel, carries out according to the following steps；(1) GCr15 bearing composition of steel smelting-casting is pressed, slab is in 1000 ± 5 DEG C of isothermal processes；(2) in 1000 ± 5 DEG C of progress single pass hot rollings；(3) hot rolled plate is air-cooled to 780 ± 5 DEG C, then carries out multi-pass warm-rolling, total reduction 60~70%；(4) it at 760 ± 5 DEG C of warm-rolling plate, is placed in the heat-treatment furnace of isothermal, furnace cooling；(5) heat-treatment furnace is warming up to 820 ± 5 DEG C, an isothermal processes；It is cooled to 720 ± 5 DEG C again, secondary isothermal processing；It is air-cooled to be cooled to 600 ± 5 DEG C of taking-ups.Method of the invention only needs the isothermal processes of short period that can form better spherodized structure, and process flow isothermal time is short, and low energy consumption, high production efficiency.

Description

The method that rolling-isothermal spheroidizing processing prepares GCr15 bearing steel
Technical field
The invention belongs to metallurgical material technical field of heat treatment, in particular to a kind of rolling-isothermal spheroidizing processing system The method of standby GCr15 bearing steel.
Background technique
Bearing is known as the title of " industrial heart ", is widely used in each of national economy as one of basic machine components A department；The quality of bearing quality directly affects military service performance, service life, precision and the reliability of equipment.As bearing It is strong to should also have good resistance to deformation other than having higher requirements to wearability and fatigue resistance for main raw material(s), bearing steel Degree, turnability and dimensional stability etc.；In order to guarantee enough hardness and wearability, carbon, chromium in common GCr15 bearing steel Content reach 1% or more, the increase of phosphorus content is so that GCr15 bearing steel will form sheet after hot rolling and air cooling is handled The line and staff control of pearlite and net carbide, this line and staff control's hardness is high, plasticity is poor, is not appropriate for carrying out at cold working Reason；Usually before mechanical process, spheroidising can be carried out to reduce hardness to the tissue of rolled, and improve plasticity and toughness, ball The tissue obtained after change processing is globular pearlite tissue；Studies have shown that the coarse net carbide formed under hot-rolled state It cannot be completely eliminated in subsequent spheroidizing, drawing process of quenching, the brittleness of part can be obviously increased, and increase hardening break Tendency, how to be the outer steel worker of Current Domestic by the isothermal time that the regulation of net carbide reduces spheroidizing One of key subjects faced.
Isothermal spheroidizing is that technique produces one of upper widely applied bearing ball annealing method at this stage, specific Annealing process it is as follows: steel is heated to slightly above Ac1Held for some time is then cooled to A fastlyr1A certain temperature model below (680~720 DEG C) progress isothermal transformation in enclosing, during isothermal transformation, austenite phase can be changed into ferrite+carbide Particle, then cool to the furnace 650 DEG C come out of the stove it is air-cooled.Compared with traditional low temperature spheroidizing and continuous spheroidizing annealing technique, It is shorter the time required to isothermal spheroidizing technique, but time-consuming is still above 10h；In the past about bearing steel Quick spheroidizing annealing technology Result of study shows that the improvement of heat treatment process and the regulation of net carbide can shorten the time of isothermal spheroidizing； There are mainly two types of the methods that control net carbide is formed at this stage: first is that being influenced by the control of alloy element component cooled The precipitation of carbide in journey, and then reduce the formation of net carbide；Another kind be by the regulations such as the type of cooling after rolling come Inhibit the precipitation of net carbide；However either addition alloying element increases the ultrafast cold charge after rolling still for can all promote reality Cost in the operation of rolling of border is unfavorable for the wide popularization and application in enterprise.
Therefore, a kind of new rolling mill practice is developed, on the basis of traditional isothermal spheroidizing, realizes GCr15 bearing steel Fast spheroidizing annealing, by easy operating procedure and shorten the nodularization time organically combine, have it is very important science meaning Justice and economic benefit.
Summary of the invention
For GCr15 bearing steel at this stage during Isothermal spheroidization the problems such as existing nodularization overlong time, this Invention is designed to provide a kind of method that rolling-isothermal spheroidizing processing prepares GCr15 bearing steel, by rolling temperature The Rational choice of degree, rolling mill practice, the proeutectoid carbide during controlled rolling are precipitated by deformation induced mode, effectively Reduction isothermal spheroidizing needed for the time, improve efficiency.
Method of the invention carries out according to the following steps；
1, slab is made by GCr15 bearing composition of steel smelting molten steel and casting, by slab in 1000 ± 5 DEG C of isothermal processes 40 ~60min；
2, by the slab after isothermal processes in 1000 ± 5 DEG C of progress single pass hot rollings, hot rolling is made in reduction ratio 25~30% Plate；
3, hot rolled plate is air-cooled to 780 ± 5 DEG C, then carries out multi-pass warm-rolling, total reduction 60~70%, passage pressure 760 ± 5 DEG C of finishing temperature, warm-rolling plate is made in rate 15~44%；
4, when warm-rolling plate temperature is 760 ± 5 DEG C, warm-rolling plate is placed in the heat-treatment furnace that temperature is 760 ± 5 DEG C, is made The furnace cooling of warm-rolling plate obtains the cold warm-rolling plate of furnace to room temperature；
5, the heat-treatment furnace for being placed with the cold warm-rolling plate of furnace is warming up to 820 ± 5 DEG C, carry out an isothermal processes 40~ 60min；Heat-treatment furnace is cooled to 720 ± 5 DEG C again, secondary isothermal is carried out and handles 40~60min；Finally heat-treatment furnace is cooled down To 600 ± 5 DEG C, the cold warm-rolling plate taking-up of furnace is air-cooled to room temperature, isothermal spheroidizing processing is completed, obtains GCr15 bearing steel.
Above-mentioned 20~30mm of slab thickness.
The nodulizing grade of above-mentioned GCr15 bearing steel is 1 grade, and surface microhardness is 190~200HV.
In method of the invention, the proeutectoid carbide during controlled rolling is precipitated by deformation induced mode, heat Rolling treated, slow cooling tissue is the line and staff control of fine pearlite and the deformation induced carbide of graininess；It is slow with tradition rolling Net carbide after cold treatment is compared, and granular deformation induced carbide possesses faster dissolution in isothermal spheroidizing Speed is more advantageous to the progress of isothermal spheroidizing；With the lamellar pearlite tissue and reticulated carbon formed after traditional rolling process Compound is compared, the time needed for the reduction isothermal spheroidizing that can be imitated, and improves efficiency.
Technical principle of the invention is: passing through the Equilibrium Precipitation temperature A in carbider3It is above to apply rolling deformation processing, Carbide can be induced with graininess in original austenite crystal prevention and transgranular precipitation, the granular carbide of formation is in subsequent isothermal It can be used as the nucleation point that new globular carbide is precipitated during spheroidizing；Compared with traditional net carbide, particle The deformation induced carbide of shape is disconnected without dissolving, and the carbide particle size formed after dissolving is more uniform, after being more advantageous to The progress of divorced-eutectoid transformation in continuous Isothermal Treatment Process twice；It should be noted that air-cooled temperature must be determined in a manner described Degree and reduction ratio and relevant parameter could more effectively promote deformation induced carbide to analyse in transgranular and crystal boundary with graininess Out；Otherwise it is in the netted assembly of class that excessive deformation induced carbide can be removed in original austenite crystal prevention, is unfavorable for isothermal spheroidizing instead The progress of annealing process.
The invention has the advantages and beneficial effects that:
1, using the method for offline isothermal spheroidizing, it is only necessary to which the isothermal processes of short period can be formed more Good spherodized structure；From metallographic structure observation analysis, tissue after spheroidizing is the spherical of thin ferrite and small and dispersed Carbide particle, nodulizing grade can achieve 1 grade, and hardness reaches requirement in 190~200HV；
2, compared with traditional isothermal spheroidizing technique, isothermal time is short, and low energy consumption, high production efficiency；
3, compared with coexistence region zerolling, rolling temperature is higher, and rolling drag is smaller, anticipates with important actual production Justice.
Detailed description of the invention
Fig. 1 is the metallographic structure micrograph of the cold warm-rolling plate of furnace of the embodiment of the present invention 1；
Fig. 2 is the metallographic structure micrograph of the GCr15 bearing steel of the embodiment of the present invention 1；
Fig. 3 is the metallographic structure micrograph of the cold warm-rolling plate of furnace of comparative example 1 of the present invention；
Fig. 4 is the metallographic structure micrograph of the GCr15 bearing steel product of comparative example 1 of the present invention；
Fig. 5 is the metallographic structure micrograph of the cold warm-rolling plate of furnace in comparative example 2 of the present invention；
Fig. 6 is the metallographic structure micrograph of the GCr15 bearing steel product of comparative example 2 of the present invention；
Fig. 7 is the metallographic structure micrograph of the cold warm-rolling plate of furnace in comparative example 3 of the present invention；
Fig. 8 is the metallographic structure micrograph of the GCr15 bearing steel product of comparative example 3 of the present invention；
Fig. 9 is the metallographic structure micrograph of the cold warm-rolling plate of furnace in comparative example 4 of the present invention；
Figure 10 is the metallographic structure micrograph of the GCr15 bearing steel product of comparative example 4 of the present invention.
Specific embodiment
The Example components of GCr15 bearing steel contain C 1%, Cr 1.51%, Si by mass percentage in the embodiment of the present invention 0.22%, Mn 0.3%, Ni 0.18%, S 0.002%, P 0.002%, Cu 0.08%, Ti 0.005%, Mo 0.04%, Al 0.02%, surplus are Fe and inevitable impurity.
In the embodiment of the present invention, the milling train used in course of hot rolling is Northeastern University's rolling technique and tandem rolling automation country 400 New-type asynchronous hot rolling experimental mills of key lab (RAL).
In the embodiment of the present invention, resistance furnace is used at the through heat in the east RX-36-10 of Shenyang general purpose electric stove factory production, west Manage the HL07-22 high temperature box type resistance furnace of furnace or the production of Shanghai remittance electric furnace Co., Ltd.
The equipment that metallographic structure is observed in the embodiment of the present invention is Olympus BX53MRF type metallographic microscope.
The equipment that hardness performance test uses in the embodiment of the present invention produces micro- hard for FUTURE-TECH company, Japan Degree meter, the load used is 50gf.
Nodularization effect ranking is referring to GB/T 18254-2002 standard in the embodiment of the present invention, and the image used is Austria The metallographic structure of woods Bath BX53MRF type metallographic microscope shooting.
3~5 passage of warm-rolling in the embodiment of the present invention.
5.6~6.9mm of thickness of GCr15 bearing steel in the embodiment of the present invention.
The following are the preferred embodiment of the present invention.
Embodiment 1
Smelting molten steel and cast slab, slab thickness 25mm is made；
By slab in 1000 ± 5 DEG C of isothermal processes 60min；
By the slab after isothermal processes in 1000 ± 5 DEG C of progress single pass hot rollings with fining austenite grains, reduction ratio 28%, hot rolled plate, thickness 18mm is made；
Hot rolled plate is air-cooled to 780 ± 5 DEG C, then carries out 3 passage warm-rollings, total reduction 67%, passage pressure is respectively 28%, 31% and 44%, 760 ± 5 DEG C of finishing temperature, warm-rolling plate, thickness 6mm is made；
When warm-rolling plate temperature is 760 ± 5 DEG C, warm-rolling plate is placed in the heat-treatment furnace that temperature is 760 ± 5 DEG C, makes temperature Plate furnace cooling is rolled to room temperature, obtains the cold warm-rolling plate of furnace；Metallographic structure is as shown in Figure 1, tissue is fine pearlite and particle The line and staff control of the deformation induced carbide of shape；
The heat-treatment furnace for being placed with the cold warm-rolling plate of furnace is warming up to 820 ± 5 DEG C, an isothermal processes 60min；It again will be at heat Reason furnace is cooled to 720 ± 5 DEG C, and secondary isothermal handles 60min；Heat-treatment furnace is finally cooled to 600 ± 5 DEG C, by the cold warm-rolling of furnace Plate taking-up is air-cooled to room temperature, completes isothermal spheroidizing processing, obtains GCr15 bearing steel；Metallographic structure is as shown in Fig. 2, GCr15 The nodulizing grade of bearing steel is 1 grade, surface microhardness 190HV.
Embodiment 2
With embodiment 1, difference is method；
(1) slab thickness 30mm；Slab isothermal processes 40min；
(2) reduction ratio 25% of hot rolling, hot rolling plate thickness 22.5mm；
(3) 5 passage warm-rollings are carried out, total reduction 70%, percentage pass reduction is respectively 20%, 22%, 21%, 27% and 15%, warm-rolling plate thickness 6.9mm；
(4) isothermal processes 40min；Secondary isothermal handles 40min；
The nodulizing grade of GCr15 bearing steel is 1 grade, surface microhardness 195HV.
Embodiment 3
With embodiment 1, difference is method；
(1) slab thickness 20mm；Slab isothermal processes 50min；
(2) reduction ratio 30% of hot rolling, hot rolling plate thickness 14mm；
(3) 4 passage warm-rollings are carried out, total reduction 60%, percentage pass reduction is respectively 21%, 27%, 15% and 18%, temperature Roll plate thickness 5.6mm；
(4) isothermal processes 50min；Secondary isothermal handles 50min；
The nodulizing grade of GCr15 bearing steel is 1 grade, surface microhardness 198HV.
Comparative example 1
With embodiment 1, difference is method:
Hot rolled plate is air-cooled to 750 DEG C of progress warm-rollings (temperature reduces after air-cooled)；The tissue of the cold warm-rolling plate of furnace is fine platy pearl Body of light and the deformation induced carbide netted along the class of original austenite crystal prevention distribution；
The metallographic structure of the cold warm-rolling plate of furnace as shown in figure 3, the metallographic structure of GCr15 bearing steel product as shown in figure 4, its ball Changing grade is 2 grades, and microhardness is about 231HV.
Comparative example 2
With embodiment 1, difference is method:
Hot rolled plate directly carries out warm-rolling without air-cooled；The tissue of the cold warm-rolling plate of furnace is for fine pearlite and along original The net secondary carbide of austenite grain boundary distribution；
The metallographic structure of the cold warm-rolling plate of furnace as shown in figure 5, the metallographic structure of GCr15 bearing steel product as shown in fig. 6, its ball Changing grade is 3 grades, and microhardness is about 262HV.
Comparative example 3
With embodiment 1, difference is method:
Hot rolled plate is air-cooled to 900 DEG C of progress warm-rollings (temperature increases after air-cooled)；The tissue of the cold warm-rolling plate of furnace is fine platy Pearlite and the net secondary carbide being distributed along original austenite crystal prevention；
The metallographic structure of the cold warm-rolling plate of furnace as shown in fig. 7, the metallographic structure of GCr15 bearing steel product as shown in figure 8, its ball Changing grade is 3 grades, and microhardness is about 262HV.
Comparative example 4
With embodiment 1, difference is method:
780 DEG C of progress single pass warm-rollings are air-cooled to, reduction ratio is 67% (reducing rolling pass)；The tissue of the cold warm-rolling plate of furnace For fine pearlite and the netted deformation induced carbon compound of class being distributed along original austenite crystal prevention；
The metallographic structure of the cold warm-rolling plate of furnace as shown in figure 9, the metallographic structure of GCr15 bearing steel product is as shown in Figure 10, Nodulizing grade is 2 grades, and microhardness is about 227HV.

Claims (3)

1. a kind of rolling-isothermal spheroidizing processing method for preparing GCr15 bearing steel, it is characterised in that according to the following steps into Row；
(1) by GCr15 bearing composition of steel smelting molten steel and cast slab is made, by slab 1000 ± 5 DEG C of isothermal processes 40~ 60min；
(2) by the slab after isothermal processes in 1000 ± 5 DEG C of progress single pass hot rollings, hot rolled plate is made in reduction ratio 25~30%；
(3) hot rolled plate is air-cooled to 780 ± 5 DEG C, then carries out multi-pass warm-rolling, total reduction 60~70%, percentage pass reduction 15~44%, 760 ± 5 DEG C of finishing temperature, warm-rolling plate is made；
(4) when warm-rolling plate temperature is 760 ± 5 DEG C, warm-rolling plate is placed in the heat-treatment furnace that temperature is 760 ± 5 DEG C, makes warm-rolling Plate furnace cooling obtains the cold warm-rolling plate of furnace to room temperature；
(5) heat-treatment furnace for being placed with the cold warm-rolling plate of furnace is warming up to 820 ± 5 DEG C, carries out a 40~60min of isothermal processes； Heat-treatment furnace is cooled to 720 ± 5 DEG C again, secondary isothermal is carried out and handles 40~60min；Heat-treatment furnace is finally cooled to 600 ± 5 DEG C, the cold warm-rolling plate taking-up of furnace is air-cooled to room temperature, isothermal spheroidizing processing is completed, obtains GCr15 bearing steel.
2. the method that rolling according to claim 1-isothermal spheroidizing processing prepares GCr15 bearing steel, feature exist In the 20~30mm of slab thickness.
3. the method that rolling according to claim 1-isothermal spheroidizing processing prepares GCr15 bearing steel, feature exist It is 1 grade in the nodulizing grade of the GCr15 bearing steel, surface microhardness is 190~200HV.
CN201910709590.8A 2019-08-02 2019-08-02 The method that rolling-isothermal spheroidizing processing prepares GCr15 bearing steel Pending CN110283975A (en)

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PCT/CN2019/099770 WO2021022542A1 (en) 2019-08-02 2019-08-08 Preparation method for gcr15 bearing steel by rolling-isothermal spheroidizing annealing treatment

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CN114107626A (en) * 2021-11-30 2022-03-01 联峰钢铁（张家港）有限公司 Continuous spheroidizing annealing method for high-carbon chromium bearing steel round steel
CN114317932B (en) * 2021-12-27 2023-07-25 中航卓越锻造（无锡）有限公司 Heat treatment method for obtaining balanced state tissue of thick-wall high-cylinder ring forging
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