CN105755222A - Process for manufacturing high-yield low-nitrogen low-oxygen electroslag bearing steel forged piece - Google Patents
Process for manufacturing high-yield low-nitrogen low-oxygen electroslag bearing steel forged piece Download PDFInfo
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- CN105755222A CN105755222A CN201610224068.7A CN201610224068A CN105755222A CN 105755222 A CN105755222 A CN 105755222A CN 201610224068 A CN201610224068 A CN 201610224068A CN 105755222 A CN105755222 A CN 105755222A
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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
- C21D1/28—Normalising
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
- B21J1/06—Heating or cooling methods or arrangements specially adapted for performing forging or pressing operations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
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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
- C21D3/00—Diffusion processes for extraction of non-metals; Furnaces therefor
- C21D3/02—Extraction of non-metals
- C21D3/06—Extraction of hydrogen
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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
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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Abstract
The invention discloses a process for manufacturing a high-yield low-nitrogen low-oxygen electroslag bearing steel forged piece. The process comprises a consumable electrode, an electroslag ingot, a forging process and forged piece flaw detection inspection. In the process, the total oxygen content of the consumable electrode in the production can be less than or equal to 10ppm, the nitrogen content can be less than or equal to 40ppm, an electroslag remelting furnace is adopted to produce a square electroslag ingot which is 6 meters long and 280*325mm in size by using a continuous deoxygenation process in an ingot drawing manner, and finally the expected forged piece is produced through forging. By adopting the process, continuous deoxygenation can be achieved, and the forging utilization rate is high. A continuous-casting converter billet is taken as the consumable electrode, the electroslag ignite of which the length-diameter ratio is up to 18:1 can be produced in the ingot drawing manner, moreover the bearing steel forged piece can be manufactured through rapid forging, the utilization rate of the electroslag in the forged piece production process can be greater than or equal to 99%, the oxygen content of the bearing steel forged piece is less than or equal to 15ppm, the nitrogen content of the bearing steel forged piece is less than or equal to 40ppm, moreover the production consumption can be effectively reduced, the quality of the electroslag ingot can be improved, and the use requirements of high-end users can be met.
Description
Technical field
The present invention relates to metallurgical method, specifically a kind of employing continuous-casting converter billet is raw material, utilizing continuous deoxidation stripping formula electroslag refining furnace to produce overlength ingot shape, low oxygen and low nitrogen beating steel GCr15 electroslag side ingot, improved Forging Technology produces the method for high quality and low cost electroslag beating steel GCr15 forging.
Background technology
Bearing steel inclusion (mainly oxide) is the topmost factor reducing bearing steel fatigue life.Therefore, removing oxide inclusions in bearing steel to greatest extent is the effective way improving bearing steel fatigue life.And the number of the oxygen content energy direct reaction oxide inclusions in steel, so must by the Control for Oxygen Content in bearing steel in very low level.
Oxygen content general control in current electroslag bearing steel is at 20ppm, nitrogen at about 50ppm, and ESR ingot draw ratio is lower than 2.5:1, and utilization rate only has 90%.
Summary of the invention
Solving the technical problem that of the present invention is to provide a kind of high yield, low nitrogen hypoxia electroslag bearing steel forge piece manufacturing process, and technique oxygen content is low, nitrogen content is low for this, and ESR ingot draw ratio is high, and utilization rate is high.
For solving above-mentioned technical problem, the present invention by the following technical solutions:
A kind of high yield, low nitrogen hypoxia electroslag bearing steel forge piece manufacturing process, its process includes consutrode, ESR ingot, Forging Technology, forging flaw detection, and described casting technique comprises the following steps:
(1) bearing steel is through forging, its forging ratio >=8, wherein honest thick ratio >=4, and in forging process, its technological parameter is,
A, heating, charging temperature≤400 DEG C, heating to 850 DEG C of insulations, by 0.25 minute/；Rise to 1250 DEG C to be again incubated, by 0.3 minute/；And require the heated workpiece table heart temperature difference≤30 DEG C, programming rate≤10 DEG C/min；
B, initial forging temperature: 1200 DEG C～1220 DEG C；
C, final forging temperature: 820 DEG C～870 DEG C；
D, hammering weight: be configured by " light-weight-light "；
The insulation slow cooling of e, forging, after workpiece has been forged, should put it in holding pit in time, and the temperature of holding pit must not lower than 600 DEG C, must not lower than 500 DEG C when forging takes out from holding pit.
This technique is by the improvement of above-mentioned Forging Technology, design forging ratio >=8, wherein honest thick ratio >=4, and improve the temperature and time parameter in forging process, hammering weight in forging process is configured by " light-weight-light ", and forging is incubated slow cooling, to finally improve the quality of this technique products obtained therefrom.
In the production of above-mentioned technical process control, consutrode total oxygen content can reach below 10ppm, nitrogen content reaches below 40ppm, again through adopting continuous deoxidization technique stripping electroslag refining furnace, produce electroslag side's ingot of 280mm × 325mm 6 meters long, eventually pass forging and go out required forging.This kind of technique can deoxidation continuously, forging utilization rate height.Continuous-casting converter billet is adopted to produce draw ratio reach the ESR ingot of 18:1 as consutrode, continuous deoxidation, stripping, and become bearing steel forging through rapid forge, in above-mentioned forging production process, ESR ingot utilization rate reaches more than 99%, bearing steel forging oxygen content≤15ppm, nitrogen content≤40ppm, and can effectively reduce production consumption, improve ESR ingot quality, meet high-end user instructions for use.
As the further improvement to the technical program, adopt after described forging and expand hydrogen process PROCESS FOR TREATMENT, remove hydrogen and other harmful gas in forging, forging is heated to 700 DEG C, temperature is maintained at 690 DEG C-710 DEG C and carries out expanding hydrogen process more than 30h, come out of the stove when then cooling to the furnace below 300 DEG C, obtain expanding the workpiece after hydrogen processes.
As the further improvement to the technical program, expanding the workpiece after hydrogen processes, will carry out normalizing spheroidizing, carry out staged intensification heat treatment, its technique is as follows,
A, heated parts, to 680 DEG C, are incubated 1 hour；
B, it is heated to 850 DEG C, is incubated two hours；
C, be heated to 925 DEG C-935 DEG C be incubated 2 hours；
D, by workpiece air cooling to room temperature.
As the further improvement to the technical program, bof process continuous casting billet is consutrode, Electroslag Process is continuous deoxidation, stripping formula, and wherein, slag charge proportioning is, SiO2: 5～10%, CaO:10～20%, Al2O3: 20～30%, CaF2: 50～60%, molten speed is 450～600kg/h.
As the further improvement to the technical program, the continuous deoxidation of Electroslag Process, top of the slag continuous uniform adds deoxidizer, adjusts the quantity and speed that add deoxidizer, makes the oxygen content≤15ppm in beating steel GCr15, nitrogen content≤40ppm.
As the further improvement to the technical program, described consutrode is to utilize ripe converter LF RH CCM to produce the consutrode obtaining high cleanliness, LF production process adopts submerged-arc smelting technique and Al content is controlled below 0.015%, FeO+MnO≤0.5% in refining slag, RH vacuum degree control is at below 100ppm, and is strictly on guard against that steel pouring process inhales nitrogen and oxygen by big bag sealing.
Accompanying drawing explanation
Hydrogen process process-control chart is expanded in the forging post processing that Fig. 1 is the present invention.
Fig. 2 is the staged intensification Technology for Heating Processing of forging normalizing spheroidizing of the present invention
Detailed description of the invention
Embodiment 1
(1) ripe converter LF RH CCM is utilized to produce the consutrode of high cleanliness
LF production process adopts submerged-arc smelting technique and Al content is controlled below 0.015%, FeO+MnO≤0.5% in refining slag, RH vacuum degree control is at below 100ppm, and is strictly on guard against that steel pouring process inhales nitrogen and oxygen by big bag sealing, to ensure the quality of consutrode.
(2) utilize continuous deoxidation, stripping explained hereafter to go out draw ratio and reach the ESR ingot of 18:1
In Electroslag Process, the oxygen in air is by the top of the slag to molten biography oxygen, and by adding aluminium powder to top of the slag continuous uniform, it is possible to the effective oxygen stoped in air enters in molten steel by slag, this is that to produce low-oxygen steel requisite.Determine that applicable stripping formula electroslag refining furnace produces the suitable deoxidizer addition speed of beating steel GCr15, slag system and molten speed by detection repeatedly, make the oxygen content≤15ppm in beating steel GCr15, nitrogen content≤40ppm, to improve fatigue life, and ESR ingot composition, surface, low multiple quality etc. can meet the requirement of Direct Rolling.
In fusion process, air constantly passes oxygen in slag, determines according to the transmission speed of oxygen, with the frequency of 14g/3min, aluminium powder is added slag bath, and the oxygen fully transmitted with air is combined, and stops it to pass oxygen further in molten bath and causes oxygen content in steel significantly to raise.
Stripping formula electroslag furnace requires that slag has certain high-temp plastic, during throwing, green shell is played support and lubrication to ensure surface quality, and slag adds a small amount of SiO2, the fusing point of slag can be reduced, improve the high-temp plastic of slag, make ingot casting any surface finish, therefore smelt in tradition and a small amount of SiO2 is added on the basis of GCr15 slag system, slag proportioning is in Table 1, the total quantity of slag 200～220kg, and molten speed is 450～600kg/h.
Table 1: slag charge proportioning
Table 1
| Composition | SiO2 | Al2O3 | CaO | CaF2 |
| Content/% | 10 | 20 | 10 | 60 |
Surface quality: ESR ingot surface quality is good, meets the requirement of direct forging rolling.
Chemical composition: meet SKF standard-required.
Macrostructure: ESR ingot macrostructure fine uniform, meets new Forging Technology requirement.
(3) Forging Technology
Bearing steel has to pass through forging, and forging ratio is 8, and wherein honest thick ratio is for 4, and its technological parameter is:
Heating: charging temperature 400 DEG C, heating, to 850 DEG C of insulations (by 0.25 minute /), rises to 1250 DEG C of insulations (by 0.3 minute /) again, and the heated workpiece table heart temperature difference is less than 30 DEG C, and programming rate is less than 10 DEG C/min.
Initial forging temperature: 1200 DEG C.
Final forging temperature: 820 DEG C.
Hammering weight: by the principle of " light-weight-light ".
Forging insulation slow cooling: after workpiece has been forged, should put it in holding pit in time, the temperature of holding pit 600 DEG C, temperature 500 DEG C when forging takes out from holding pit.
(4) forging post processing
In order to remove the content of hydrogen and other harmful gas in forging, the following hydrogen that expands is adopted to process technique:
Forging is heated to 690 DEG C, and temperature is maintained at 690 DEG C and carries out expanding hydrogen process 30h, comes out of the stove, obtain expanding the workpiece after hydrogen processes when then cooling to 300 DEG C with the furnace.
(5) the staged intensification Technology for Heating Processing of forging normalizing spheroidizing
In order to make material structure more uniform, improving machinability, workpiece to carry out normalizing spheroidizing after expanding hydrogen process, and Technology for Heating Processing is as follows:
A, heated parts, to 680 DEG C, are incubated 1 hour；
B, it is heated to 850 DEG C, is incubated two hours；
C, be heated to 925 DEG C be incubated 2 hours；
D, by workpiece air cooling to room temperature.
(6) forging after heat treatment is carried out flaw detection
It is cooled to room temperature after forging heat treatment, adopts ultrasonic reflectoscope to carry out inspection piece by piece:
Inspection equipment: UDF-200 ultrasonic fault detector probe specification: 2.5P20-D
Reference block: big flat detection method: end ripple method
Detection sensitivity: φ 2 initiates couplant: machine oil
The oxygen nitrogen of forging, field trash, low power, carbide etc. are tested, and assay is in Table 2.Averaged Oxygen content in forging is 13.66ppm, and nitrogen content is 27.58ppm.
Table 2: the assays such as the oxygen nitrogen of forging, field trash, low power, carbide.
Table 2
nullAssay is analyzed: a kind of high yield of the present invention、Low nitrogen hypoxia electroslag bearing steel forge piece manufacturing process is a kind of use continuous casting billet is consutrode、The continuous deoxidation of Electroslag Process、Stripping formula electroslag refining furnace and rapid forge explained hereafter Ultra Low-oxygen nitrogen、The technique of lumber recovery steel bearing steel forging，Determine use continuous casting billet as consutrode、Produce the deoxidization technique of bearing steel、Slag proportioning and the molten speed matched，And it is applicable to the Forging Technology of elongated ingot shape，Make the oxygen content≤15ppm in beating steel GCr15、Nitrogen content≤40ppm、D field trash is not more than 1.0 grades、A type impurity is not more than 0.5 grade、B and C type impurity is 0 grade、Low power is 0.5 grade、Liquation is 0 grade、Banding is not more than 1.0 grades，Cut utilization rate and reach the high-quality bearing steel forging of more than 99%，It is fully achieved SKF standard.
Embodiment 2
(1)-(2) technical process is identical with embodiment 1；Slag charge proportioning table is different from (1)-(2) technical process, its proportioning such as following table:
Table 3 slag charge proportioning
Table 3
| Composition | SiO2 | Al2O3 | CaO | CaF2 |
| Content/% | 5 | 30 | 15 | 50 |
(3) Forging Technology
Bearing steel has to pass through forging, and forging ratio is 9, and wherein honest thick ratio is for 5, and its technological parameter is:
A, heating, charging temperature 390 DEG C, heating to 850 DEG C of insulations, by 0.25 minute/；Rise to 1250 DEG C to be again incubated, by 0.3 minute/；And requiring that the heated workpiece table heart temperature difference is 28 DEG C, programming rate is 9 DEG C/min；
B, initial forging temperature: 1220 DEG C；
C, final forging temperature: 870 DEG C；
D, hammering weight: be configured by " light-weight-light "；
The insulation slow cooling of e, forging, after workpiece has been forged, should put it in holding pit in time, and the temperature of holding pit must not lower than 610 DEG C, must not lower than 510 DEG C when forging takes out from holding pit.
(4) forging post processing
In order to remove the content of hydrogen and other harmful gas in forging, the following hydrogen that expands is adopted to process technique:
Forging is heated to 700 DEG C, and temperature is maintained at 700 DEG C and carries out expanding hydrogen process 38h, comes out of the stove, obtain expanding the workpiece after hydrogen processes when then cooling to the furnace below 280 DEG C.
(5) the staged intensification Technology for Heating Processing of forging normalizing spheroidizing
In order to make material structure more uniform, improving machinability, workpiece to carry out normalizing spheroidizing after expanding hydrogen process, and Technology for Heating Processing is as follows:
As the further improvement to the technical program, expanding the workpiece after hydrogen processes, will carry out normalizing spheroidizing, carry out staged intensification heat treatment, its technique is as follows,
A, heated parts, to 680 DEG C, are incubated 1 hour；
B, it is heated to 850 DEG C, is incubated two hours；
C, be heated to 935 DEG C be incubated 2 hours；
D, by workpiece air cooling to room temperature.
(6) forging after heat treatment is carried out flaw detection
It is cooled to room temperature after forging heat treatment, adopts ultrasonic reflectoscope to carry out inspection piece by piece:
Inspection equipment: UDF-200 ultrasonic fault detector probe specification: 2.5P20-D
Reference block: big flat detection method: end ripple method
Detection sensitivity: φ 2 initiates couplant: machine oil
The oxygen nitrogen of forging, field trash, low power, carbide etc. are tested, and assay is in Table 2.Averaged Oxygen content in forging is 13.66ppm, and nitrogen content is 27.58ppm.
Table 4: the assays such as the oxygen nitrogen of forging, field trash, low power, carbide.
Table 4
nullAssay is analyzed: a kind of high yield of the present invention、Low nitrogen hypoxia electroslag bearing steel forge piece manufacturing process is a kind of use continuous casting billet is consutrode、The continuous deoxidation of Electroslag Process、Stripping formula electroslag refining furnace and rapid forge explained hereafter Ultra Low-oxygen nitrogen、The technique of lumber recovery steel bearing steel forging，Determine use continuous casting billet as consutrode、Produce the deoxidization technique of bearing steel、Slag proportioning and the molten speed matched，And it is applicable to the Forging Technology of elongated ingot shape，Make the oxygen content≤15ppm in beating steel GCr15、Nitrogen content≤40ppm、D field trash is not more than 1.0 grades、A type impurity is not more than 0.5 grade、B and C type impurity is 0 grade、Low power is 0.5 grade、Liquation is 0 grade、Banding is not more than 1.0 grades，Cut utilization rate and reach the high-quality bearing steel forging of more than 99%，It is fully achieved SKF standard.
Embodiment 3
(1)-(2) technical process is identical with embodiment 1；Slag charge proportioning table is different from (1)-(2) technical process, its proportioning such as following table:
Table 5: slag charge proportioning
Table 5
| Composition | SiO2 | Al2O3 | CaO | CaF2 |
| Content/% | 5～10 | 20～30 | 10～20 | 50～60 |
(3) Forging Technology
Bearing steel has to pass through forging, and forging ratio is 10, and wherein honest thick ratio is for 6, and its technological parameter is:
A, heating, charging temperature 380 DEG C, heating to 850 DEG C of insulations, by 0.25 minute/；Rise to 1250 DEG C to be again incubated, by 0.3 minute/；And requiring that the heated workpiece table heart temperature difference is 28 DEG C, programming rate is 9 DEG C/min；
B, initial forging temperature: 1210 DEG C；
C, final forging temperature: 845 DEG C；
D, hammering weight: be configured by " light-weight-light "；
The insulation slow cooling of e, forging, after workpiece has been forged, should put it in holding pit in time, and the temperature of holding pit must not lower than 610 DEG C, must not lower than 520 DEG C when forging takes out from holding pit.
(4) forging post processing
In order to remove the content of hydrogen and other harmful gas in forging, the following hydrogen that expands is adopted to process technique:
Forging is heated to 710 DEG C, and temperature is maintained at 710 DEG C and carries out expanding hydrogen process 38h, comes out of the stove, obtain expanding the workpiece after hydrogen processes when then cooling to the furnace below 260 DEG C.
(5) the staged intensification Technology for Heating Processing of forging normalizing spheroidizing
In order to make material structure more uniform, improving machinability, workpiece to carry out normalizing spheroidizing after expanding hydrogen process, and Technology for Heating Processing is as follows:
As the further improvement to the technical program, expanding the workpiece after hydrogen processes, will carry out normalizing spheroidizing, carry out staged intensification heat treatment, its technique is as follows,
A, heated parts, to 680 DEG C, are incubated 1 hour；
B, it is heated to 850 DEG C, is incubated two hours；
C, be heated to 930 DEG C be incubated 2 hours；
D, by workpiece air cooling to room temperature.
(6) forging after heat treatment is carried out flaw detection
It is cooled to room temperature after forging heat treatment, adopts ultrasonic reflectoscope to carry out inspection piece by piece:
Inspection equipment: UDF-200 ultrasonic fault detector probe specification: 2.5P20-D
Reference block: big flat detection method: end ripple method
Detection sensitivity: φ 2 initiates couplant: machine oil
The oxygen nitrogen of forging, field trash, low power, carbide etc. are tested, and assay is in Table 2.Averaged Oxygen content in forging is 13.66ppm, and nitrogen content is 27.58ppm.
Table 6: the assays such as the oxygen nitrogen of forging, field trash, low power, carbide.
Table 6
nullAssay is analyzed: a kind of high yield of the present invention、Low nitrogen hypoxia electroslag bearing steel forge piece manufacturing process is a kind of use continuous casting billet is consutrode、The continuous deoxidation of Electroslag Process、Stripping formula electroslag refining furnace and rapid forge explained hereafter Ultra Low-oxygen nitrogen、The technique of lumber recovery steel bearing steel forging，Determine use continuous casting billet as consutrode、Produce the deoxidization technique of bearing steel、Slag proportioning and the molten speed matched，And it is applicable to the Forging Technology of elongated ingot shape，Make the oxygen content≤15ppm in beating steel GCr15、Nitrogen content≤40ppm、D field trash is not more than 1.0 grades、A type impurity is not more than 0.5 grade、B and C type impurity is 0 grade、Low power is 0.5 grade、Liquation is 0 grade、Banding is not more than 1.0 grades，Cut utilization rate and reach the high-quality bearing steel forging of more than 99%，It is fully achieved SKF standard.
Claims (6)
1. high yield, a low nitrogen hypoxia electroslag bearing steel forge piece manufacturing process, its process includes consutrode, ESR ingot, Forging Technology, forging flaw detection, it is characterised in that, described casting technique comprises the following steps: bearing steel is through forging, its forging ratio >=8, wherein honest thick ratio >=4, in forging process, its technological parameter is, a, heating, charging temperature≤400 DEG C, heating to 850 DEG C of insulations, by 0.25 minute/；Rise to 1250 DEG C to be again incubated, by 0.3 minute/；And require the heated workpiece table heart temperature difference≤30 DEG C, programming rate≤10 DEG C/min；B, initial forging temperature: 1200 DEG C～1220 DEG C；C, final forging temperature: 820 DEG C～870 DEG C；D, hammering weight: be configured by " light-weight-light "；The insulation slow cooling of e, forging, after workpiece has been forged, should put it in holding pit in time, and the temperature of holding pit must not lower than 600 DEG C, must not lower than 500 DEG C when forging takes out from holding pit.
2. a kind of high yield, low nitrogen hypoxia electroslag bearing steel forge piece manufacturing process according to claim 1, it is characterized in that: adopt after described forging and expand hydrogen process PROCESS FOR TREATMENT, remove hydrogen and other harmful gas in forging, forging is heated to 700 DEG C, temperature is maintained at 690 DEG C-710 DEG C and carries out expanding hydrogen process more than 30h, come out of the stove when then cooling to the furnace below 300 DEG C, obtain expanding the workpiece after hydrogen processes.
3. a kind of high yield, low nitrogen hypoxia electroslag bearing steel forge piece manufacturing process according to claim 2, it is characterised in that: expand the workpiece after hydrogen processes, normalizing spheroidizing will be carried out, carry out staged intensification heat treatment, its technique is as follows, and a, heated parts, to 680 DEG C, are incubated 1 hour；B, it is heated to 850 DEG C, is incubated two hours；C, be heated to 925 DEG C-935 DEG C be incubated 2 hours；D, by workpiece air cooling to room temperature.
4. a kind of high yield, low nitrogen hypoxia electroslag bearing steel forge piece manufacturing process according to claim 1, it is characterised in that: bof process continuous casting billet is consutrode, Electroslag Process is continuous deoxidation, stripping formula, and wherein, slag charge proportioning is, SiO2: 5～10%, CaO:10～20%, Al2O3: 20～30%, CaF2: 50～60%, molten speed is 450～600kg/h.
5. a kind of high yield, low nitrogen hypoxia electroslag bearing steel forge piece manufacturing process according to claim 4, it is characterized in that: the continuous deoxidation of Electroslag Process, top of the slag continuous uniform adds deoxidizer, adjust the quantity and speed that add deoxidizer, make the oxygen content≤15ppm in beating steel GCr15, nitrogen content≤40ppm.
6. a kind of high yield according to claim 1-5, low nitrogen hypoxia electroslag bearing steel forge piece manufacturing process, it is characterized in that: described consutrode is to utilize ripe converter LF RH CCM to produce the consutrode obtaining high cleanliness, LF production process adopts submerged-arc smelting technique and Al content is controlled below 0.015%, FeO+MnO≤0.5% in refining slag, RH vacuum degree control is at below 100ppm, and is strictly on guard against that steel pouring process inhales nitrogen and oxygen by big bag sealing.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109457081A (en) * | 2018-12-28 | 2019-03-12 | 建龙北满特殊钢有限责任公司 | A kind of microalloying of rare earth bearing steel and preparation method thereof |
| CN109680120A (en) * | 2019-01-11 | 2019-04-26 | 辽宁科技大学 | The control method of steel ingot total oxygen content in a kind of esr process |
| CN112846055A (en) * | 2020-12-16 | 2021-05-28 | 哈尔滨工业大学 | Forging forming method for aero-engine roller bearing ring capable of controlling reasonable distribution of metal flow lines |
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| CN102756070A (en) * | 2012-07-18 | 2012-10-31 | 浙江天马轴承股份有限公司 | Forging method of bearing ring |
| CN103447766A (en) * | 2013-08-27 | 2013-12-18 | 贵州安大航空锻造有限责任公司 | Preparing method of GCr15 bearing steel large-scale special-shaped cross section annular blank |
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| CN101748344A (en) * | 2008-12-09 | 2010-06-23 | 山东远大模具材料有限公司 | Railway track welded steel and manufacturing technology thereof |
| CN101824584A (en) * | 2010-03-22 | 2010-09-08 | 山东远大模具材料有限公司 | High-performance granular bainite rail steel and production process |
| CN102756070A (en) * | 2012-07-18 | 2012-10-31 | 浙江天马轴承股份有限公司 | Forging method of bearing ring |
| CN103447766A (en) * | 2013-08-27 | 2013-12-18 | 贵州安大航空锻造有限责任公司 | Preparing method of GCr15 bearing steel large-scale special-shaped cross section annular blank |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109457081A (en) * | 2018-12-28 | 2019-03-12 | 建龙北满特殊钢有限责任公司 | A kind of microalloying of rare earth bearing steel and preparation method thereof |
| CN109680120A (en) * | 2019-01-11 | 2019-04-26 | 辽宁科技大学 | The control method of steel ingot total oxygen content in a kind of esr process |
| CN112846055A (en) * | 2020-12-16 | 2021-05-28 | 哈尔滨工业大学 | Forging forming method for aero-engine roller bearing ring capable of controlling reasonable distribution of metal flow lines |
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| CN105755222B (en) | 2018-05-18 |
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