CN105755222B - A kind of high yield, low nitrogen hypoxemia electroslag bearing steel forge piece manufacturing process - Google Patents

A kind of high yield, low nitrogen hypoxemia electroslag bearing steel forge piece manufacturing process Download PDF

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CN105755222B
CN105755222B CN201610224068.7A CN201610224068A CN105755222B CN 105755222 B CN105755222 B CN 105755222B CN 201610224068 A CN201610224068 A CN 201610224068A CN 105755222 B CN105755222 B CN 105755222B
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forging
temperature
electroslag
consutrode
bearing steel
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CN105755222A (en
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葛永胜
李晨哲
李士华
程京良
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Yanggu Gangli Mining Machinery Manufacturing Co Ltd
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Yanggu Gangli Mining Machinery Manufacturing Co Ltd
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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
    • 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
    • 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
    • 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
    • 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
    • C21D3/00—Diffusion processes for extraction of non-metals; Furnaces therefor
    • C21D3/02—Extraction of non-metals
    • C21D3/06—Extraction of hydrogen
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting

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

Abstract

The invention discloses a kind of high yield, low nitrogen hypoxemia electroslag bearing steel forge piece manufacturing process, its process includes consutrode, ESR ingot, forging technology, forging flaw detection, consutrode total oxygen content can reach below 10ppm, nitrogen content reaches below 40ppm in technical process control production, then by using continuous deoxidization technique stripping electroslag refining furnace, electroslag side's ingot of 6 meters of long 280mm × 325mm is produced, finally goes out required forging by forging.This kind technique can continuously deoxidation, forging utilization rate be high.Reach 18 as consutrode, continuous deoxidation, stripping production draw ratio using continuous-casting converter billet:1 ESR ingot, and by rapid forge into bearing steel forgings, ESR ingot utilization rate reaches more than 99% in above-mentioned forging production process, bearing steel forgings oxygen content≤15ppm, nitrogen content≤40ppm, and production consumption can be effectively reduced, ESR ingot quality is improved, meets high-end user requirement.

Description

A kind of high yield, low nitrogen hypoxemia electroslag bearing steel forge piece manufacturing process
Technical field
It is specifically a kind of to use continuous-casting converter billet as raw material the present invention relates to metallurgical method, it is taken out using continuous deoxidation Ingot formula electroslag refining furnace produces overlength ingot shape, low oxygen and low nitrogen beating steel GCr15 electroslag side ingot, improved forging technology life The method for producing high quality and low cost electroslag beating steel GCr15 forging.
Background technology
Bearing steel inclusion (mainly oxide) is a most important factor for reducing bearing steel fatigue life.Cause This, it is the effective way for improving bearing steel fatigue life to remove oxide in bearing steel to greatest extent to be mingled with.And the oxygen in steel Content can directly react the number that oxide is mingled with, so must be by the Control for Oxygen Content in bearing steel in very low level.
At present the oxygen content general control in electroslag bearing steel in 20ppm, nitrogen in 50ppm or so, and ESR ingot major diameter Than being less than 2.5:1, utilization rate only has 90%.
The content of the invention
The technical problem to be solved by the invention is provide a kind of high yield, the manufacture of low nitrogen hypoxemia electroslag bearing steel forgings Technique, the technique oxygen content is low, nitrogen content is low, and ESR ingot draw ratio is high, and utilization rate is high.
In order to solve the above technical problems, the present invention uses following technical scheme：
A kind of high yield, low nitrogen hypoxemia electroslag bearing steel forge piece manufacturing process, process include consutrode, electroslag Ingot, forging technology, forging flaw detection, the forging technology comprise the following steps：
(1) bearing steel is by forging, forging ratio >=8, wherein upsetting ratio >=4, its technological parameter is in forging process,
A, heat, charging temperature≤400 DEG C, 850 DEG C of heat preservations are heated to, by 0.25 Fen Zhong/㎜；1250 DEG C are risen to protect again Temperature, by 0.3 Fen Zhong/㎜；And requirement is by the heating workpiece table heart temperature difference≤30 DEG C, heating 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, weight is hammered：It is configured by " light-weight-light "；
E, forging heat preservation slow cooling, after workpiece has been forged, should put it into holding pit, the temperature of holding pit must not be low in time In 600 DEG C, 500 DEG C must not be less than when forging takes out from holding pit.
This technique designs forging ratio >=8, wherein upsetting ratio >=4, and improve and forged by the improvement of above-mentioned forging technology Temperature and time parameter in journey is configured the hammering weight in forging process by " light-weight-light ", and forging is kept the temperature Slow cooling, to finally improve the quality of this technique products obtained therefrom.
Consutrode total oxygen content can reach below 10ppm, nitrogen content reaches in above-mentioned technical process control production Below 40ppm, then by using continuous deoxidization technique stripping electroslag refining furnace, the electroslag of 6 meters of long 280mm × 325mm of production Square ingot finally goes out required forging by forging.This kind technique can continuously deoxidation, forging utilization rate be high.Connected using converter Strand reaches 18 as consutrode, continuous deoxidation, stripping production draw ratio:1 ESR ingot, and pass through rapid forge into bearing Steel forgings, ESR ingot utilization rate reaches more than 99% in above-mentioned forging production process, bearing steel forgings oxygen content≤15ppm, nitrogen Content≤40ppm, and production consumption can be effectively reduced, ESR ingot quality is improved, meets high-end user requirement.
It is further improved as to the technical program, using the processing of hydrogen treatment process is expanded after the forging, removes Hydrogen and other pernicious gases in forging, forging are heated to 700 DEG C, temperature be maintained at 690 DEG C -710 DEG C expand hydrogen processing 30h with On, it comes out of the stove when then cooling to less than 300 DEG C with the furnace, obtains expanding hydrogen treated workpiece.
It is further improved as to the technical program, expands hydrogen treated workpiece, to carry out normalizing spheroidizing, carried out Staged heating heat treatment, technique is as follows,
A, workpiece is heated to 680 DEG C, when heat preservation 1 is small；
B, 850 DEG C are heated to, keeps the temperature two hours；
C, be heated to 925 DEG C -935 DEG C heat preservation 2 it is small when；
D, workpiece is air-cooled to room temperature.
It is further improved as to the technical program, bof process continuous casting billet is consutrode, Electroslag Process is continuous Deoxidation, stripping formula, wherein, slag charge proportioning is SiO2：5~10%, CaO：10~20%, Al2O3：20~30%, CaF2：50~ 60%, it is 450~600kg/h to melt speed.
It being further improved as to the technical program, the continuous deoxidation of Electroslag Process, top of the slag continuous uniform adds in deoxidier, Adjustment adds in the quantity and speed of deoxidier, makes oxygen content≤15ppm, the nitrogen content≤40ppm in beating steel GCr15.
Be further improved as to the technical program, the consutrode be using ripe converter-LF-RH- CCM produces to obtain the consutrode of high cleanliness, exists using submerged-arc smelting technique in LF production processes and by Al content control Less than 0.015%, FeO+MnO≤0.5% in refining slag, RH vacuum degree controls pass through bag sealing greatly in below 100ppm Prevent that steel pouring process inhales nitrogen and oxygen.
Description of the drawings
Hydrogen treatment process control figure is expanded in the forging post processing that Fig. 1 is the present invention.
Fig. 2 is the staged heating heat treatment process of forging normalizing spheroidizing of the present invention
Specific embodiment
Embodiment 1
(1) consutrode of high cleanliness is produced using ripe converter-LF-RH-CCM
In LF production processes using submerged-arc smelting technique and by Al content control below 0.015%, in refining slag FeO+MnO≤0.5%, RH vacuum degree control pass through bag sealing greatly and prevent that steel pouring process inhales nitrogen and oxygen in below 100ppm, To ensure the quality of consutrode.
(2) go out draw ratio using continuous deoxidation, stripping technique productions and reach 18:1 ESR ingot
In Electroslag Process, oxygen in air by the top of the slag to molten biography oxygen, by adding in aluminium powder, energy to top of the slag continuous uniform The enough effective oxygen prevented in air is entered by clinker in molten steel, this is that production low-oxygen steel is essential.By examining repeatedly It surveys and determines that the suitable deoxidier of suitable stripping formula electroslag refining furnace production beating steel GCr15 adds in speed, slag system and molten speed, make Oxygen content≤15ppm, nitrogen content≤40ppm in beating steel GCr15, to improve fatigue life, and ESR ingot ingredient, surface, Low multiple quality etc. can meet the requirement of Direct Rolling.
Air constantly passes oxygen into slag in fusion process, and being determined according to the transmission speed of oxygen will with the frequency of 14g/3min Aluminium powder adds in slag bath, is fully combined with the oxygen that air transmits, it is prevented further to pass oxygen into molten bath and causes oxygen content in steel big Width raises.
Stripping formula electroslag furnace requirement clinker has certain high-temp plastic, when throwing green shell is played support and lubricating action with Ensure surface quality, and a small amount of SiO2 is added in slag, the fusing point of slag can be reduced, improve the high-temp plastic of slag, make ingot casting surface Bright and clean, therefore add a small amount of SiO2 on the basis of tradition smelts GCr15 slag systems, slag proportioning is shown in Table 1, and total quantity of slag 200~ 220kg, it is 450~600kg/h to melt speed.
Table 1：Slag charge matches
Table 1
Ingredient 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 the requirement of SKF standards.
Macrostructure：ESR ingot macrostructure fine uniform meets new forging technology requirement.
(3) forging technology
Bearing steel has to pass through forging, and forging ratio 8, wherein upsetting ratio are 4, and technological parameter is：
Heating：400 DEG C of charging temperature is heated to 850 DEG C of heat preservations (by 0.25 Fen Zhong/㎜), rises to 1250 DEG C and keep the temperature again (dividing clock/㎜ by 0.3) is less than 30 DEG C by the heating workpiece table heart temperature difference, and heating rate is less than 10 DEG C/min.
Initial forging temperature：1200℃.
Final forging temperature：820℃.
Hammer weight：By the principle of " light-weight-light ".
Forging keeps the temperature slow cooling：It after workpiece has been forged, should put it into holding pit, 600 DEG C of the temperature of holding pit, forge in time 500 DEG C of temperature when part takes out from holding pit.
(4) forging post-processes
In order to remove the content of hydrogen and other pernicious gases in forging, using following expansion hydrogen treatment process：
Forging is heated to 690 DEG C, and temperature is maintained at 690 DEG C and carries out expanding hydrogen processing 30h, when then cooling to 300 DEG C with the furnace It comes out of the stove, obtains expanding hydrogen treated workpiece.
(5) the staged heating heat treatment process of forging normalizing spheroidizing
In order to make material structure more uniform, improve machinability, after workpiece expands hydrogen processing, to carry out normalizing nodularization and move back Fire, heat treatment process are as follows：
A, workpiece is heated to 680 DEG C, when heat preservation 1 is small；
B, 850 DEG C are heated to, keeps the temperature two hours；
C, be heated to 925 DEG C heat preservation 2 it is small when；
D, workpiece is air-cooled to room temperature.
(6) forging after heat treatment is subjected to flaw detection
It is cooled to room temperature after forging heat treatment, is examined piece by piece using supersonic detector：
Examine equipment：UDF-200 ultrasonic fault detector probe specifications：2.5P20-D
Reference block：Big flat detection method：Bottom ripple method
Detection sensitivity：φ 2 originates couplant：Machine oil
It tests to the oxygen nitrogen of forging, field trash, low power, carbide etc., inspection result is shown in Table 2.Being averaged in forging Oxygen content is 13.66ppm, nitrogen content 27.58ppm.
Table 2：The inspection results such as the oxygen nitrogen of forging, field trash, low power, carbide.
Table 2
Inspection result is analyzed：A kind of high yield, the low nitrogen hypoxemia electroslag bearing steel forge piece manufacturing process of the present invention is one Kind is consutrode, the continuous deoxidation of Electroslag Process, stripping formula electroslag refining furnace and rapid forge technique productions using continuous casting billet The technique that Ultra Low-oxygen nitrogen, lumber recovery steel shaft hold steel forgings, it is determined that using continuous casting billet as consutrode, produce the de- of bearing steel Oxygen technique, slag proportioning and matching molten speed and the forging technology suitable for elongated ingot shape, make in beating steel GCr15 Oxygen content≤15ppm, nitrogen content≤40ppm, D field trash are pressed from both sides no more than 1.0 grades, A type impurities no more than 0.5 grade, B and C classes Sundries is 0 grade, low power is 0.5 grade, liquation is 0 grade, banding is no more than 1.0 grades, and utilization rate reaches more than 99% high-quality axis Steel forgings are held, SKF standards are fully achieved.
Embodiment 2
(1)-(2) technical process is same as Example 1；Slag charge proportioning table is different from (1)-(2) technical process, with such as Following table：
3 slag charge of table matches
Table 3
Ingredient SiO2 Al2O3 CaO CaF2
Content/% 5 30 15 50
(3) forging technology
Bearing steel has to pass through forging, and forging ratio 9, wherein upsetting ratio are 5, and technological parameter is：
A, heat, 390 DEG C of charging temperature, 850 DEG C of heat preservations are heated to, by 0.25 Fen Zhong/㎜；1250 DEG C are risen to protect again Temperature, by 0.3 Fen Zhong/㎜；And requirement is 28 DEG C by the heating workpiece table heart temperature difference, heating rate is 9 DEG C/min；
B, initial forging temperature：1220℃；
C, final forging temperature：870℃；
D, weight is hammered：It is configured by " light-weight-light "；
E, forging heat preservation slow cooling, after workpiece has been forged, should put it into holding pit, the temperature of holding pit must not be low in time In 610 DEG C, 510 DEG C must not be less than when forging takes out from holding pit.
(4) forging post-processes
In order to remove the content of hydrogen and other pernicious gases in forging, using following expansion hydrogen treatment process：
Forging is heated to 700 DEG C, and temperature is maintained at 700 DEG C and carries out expanding hydrogen processing 38h, then cool to the furnace 280 DEG C with It will come out of the stove when lower, obtains expanding hydrogen treated workpiece.
(5) the staged heating heat treatment process of forging normalizing spheroidizing
In order to make material structure more uniform, improve machinability, after workpiece expands hydrogen processing, to carry out normalizing nodularization and move back Fire, heat treatment process are as follows：
It is further improved as to the technical program, expands hydrogen treated workpiece, to carry out normalizing spheroidizing, carried out Staged heating heat treatment, technique is as follows,
A, workpiece is heated to 680 DEG C, when heat preservation 1 is small；
B, 850 DEG C are heated to, keeps the temperature two hours；
C, be heated to 935 DEG C heat preservation 2 it is small when；
D, workpiece is air-cooled to room temperature.
(6) forging after heat treatment is subjected to flaw detection
It is cooled to room temperature after forging heat treatment, is examined piece by piece using supersonic detector：
Examine equipment：UDF-200 ultrasonic fault detector probe specifications：2.5P20-D
Reference block：Big flat detection method：Bottom ripple method
Detection sensitivity：φ 2 originates couplant：Machine oil
It tests to the oxygen nitrogen of forging, field trash, low power, carbide etc., inspection result is shown in Table 2.Being averaged in forging Oxygen content is 13.66ppm, nitrogen content 27.58ppm.
Table 4：The inspection results such as the oxygen nitrogen of forging, field trash, low power, carbide.
Table 4
Inspection result is analyzed：A kind of high yield, the low nitrogen hypoxemia electroslag bearing steel forge piece manufacturing process of the present invention is one Kind is consutrode, the continuous deoxidation of Electroslag Process, stripping formula electroslag refining furnace and rapid forge technique productions using continuous casting billet The technique that Ultra Low-oxygen nitrogen, lumber recovery steel shaft hold steel forgings, it is determined that using continuous casting billet as consutrode, produce the de- of bearing steel Oxygen technique, slag proportioning and matching molten speed and the forging technology suitable for elongated ingot shape, make in beating steel GCr15 Oxygen content≤15ppm, nitrogen content≤40ppm, D field trash are pressed from both sides no more than 1.0 grades, A type impurities no more than 0.5 grade, B and C classes Sundries is 0 grade, low power is 0.5 grade, liquation is 0 grade, banding is no more than 1.0 grades, and utilization rate reaches more than 99% high-quality axis Steel forgings are held, SKF standards are fully achieved.
Embodiment 3
(1)-(2) technical process is same as Example 1；Slag charge proportioning table is different from (1)-(2) technical process, with such as Following table：
Table 5：Slag charge matches
Table 5
Ingredient 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 10, wherein upsetting ratio are 6, and technological parameter is：
A, heat, 380 DEG C of charging temperature, 850 DEG C of heat preservations are heated to, by 0.25 Fen Zhong/㎜；1250 DEG C are risen to protect again Temperature, by 0.3 Fen Zhong/㎜；And requirement is 28 DEG C by the heating workpiece table heart temperature difference, heating rate is 9 DEG C/min；
B, initial forging temperature：1210℃；
C, final forging temperature：845℃；
D, weight is hammered：It is configured by " light-weight-light "；
E, forging heat preservation slow cooling, after workpiece has been forged, should put it into holding pit, the temperature of holding pit must not be low in time In 610 DEG C, 520 DEG C must not be less than when forging takes out from holding pit.
(4) forging post-processes
In order to remove the content of hydrogen and other pernicious gases in forging, using following expansion hydrogen treatment process：
Forging is heated to 710 DEG C, and temperature is maintained at 710 DEG C and carries out expanding hydrogen processing 38h, then cool to the furnace 260 DEG C with It will come out of the stove when lower, obtains expanding hydrogen treated workpiece.
(5) the staged heating heat treatment process of forging normalizing spheroidizing
In order to make material structure more uniform, improve machinability, after workpiece expands hydrogen processing, to carry out normalizing nodularization and move back Fire, heat treatment process are as follows：
It is further improved as to the technical program, expands hydrogen treated workpiece, to carry out normalizing spheroidizing, carried out Staged heating heat treatment, technique is as follows,
A, workpiece is heated to 680 DEG C, when heat preservation 1 is small；
B, 850 DEG C are heated to, keeps the temperature two hours；
C, be heated to 930 DEG C heat preservation 2 it is small when；
D, workpiece is air-cooled to room temperature.
(6) forging after heat treatment is subjected to flaw detection
It is cooled to room temperature after forging heat treatment, is examined piece by piece using supersonic detector：
Examine equipment：UDF-200 ultrasonic fault detector probe specifications：2.5P20-D
Reference block：Big flat detection method：Bottom ripple method
Detection sensitivity：φ 2 originates couplant：Machine oil
It tests to the oxygen nitrogen of forging, field trash, low power, carbide etc., inspection result is shown in Table 2.Being averaged in forging Oxygen content is 13.66ppm, nitrogen content 27.58ppm.
Table 6：The inspection results such as the oxygen nitrogen of forging, field trash, low power, carbide.
Table 6
Inspection result is analyzed：A kind of high yield, the low nitrogen hypoxemia electroslag bearing steel forge piece manufacturing process of the present invention is one Kind is consutrode, the continuous deoxidation of Electroslag Process, stripping formula electroslag refining furnace and rapid forge technique productions using continuous casting billet The technique that Ultra Low-oxygen nitrogen, lumber recovery steel shaft hold steel forgings, it is determined that using continuous casting billet as consutrode, produce the de- of bearing steel Oxygen technique, slag proportioning and matching molten speed and the forging technology suitable for elongated ingot shape, make in beating steel GCr15 Oxygen content≤15ppm, nitrogen content≤40ppm, D field trash are pressed from both sides no more than 1.0 grades, A type impurities no more than 0.5 grade, B and C classes Sundries is 0 grade, low power is 0.5 grade, liquation is 0 grade, banding is no more than 1.0 grades, and utilization rate reaches more than 99% high-quality axis Steel forgings are held, SKF standards are fully achieved.

Claims (1)

1. a kind of high yield, low nitrogen hypoxemia electroslag bearing steel forge piece manufacturing process, process includes consutrode, ESR ingot, Forging technology, forging flaw detection, forging technology comprise the following steps：Bearing steel is by forging, forging ratio >=8, wherein earnestly Thick ratio >=4, its technological parameter is to heat, charging temperature≤400 DEG C in forging process, 850 DEG C of heat preservations is heated to, by 0.25 point Zhong/㎜；It rises to 1250 DEG C to keep the temperature again, by 0.3 Fen Zhong/㎜；And requirement is by the heating workpiece table heart temperature difference≤30 DEG C, heating rate ≤ 10 DEG C/min；Bof process continuous casting billet is consutrode, Electroslag Process is continuous deoxidation, stripping formula, wherein, slag charge proportioning For SiO2：5~10%, CaO：10~20%, Al2O3：20~30%, CaF2：50~60%, it is 450~600kg/h to melt speed； It is characterized in that：
Initial forging temperature：1200 DEG C~1220 DEG C；Final forging temperature：820 DEG C~870 DEG C；Hammer weight：It is set by " light-weight-light " It puts；Forging keeps the temperature slow cooling, after workpiece has been forged, should put it into time in holding pit, and the temperature of holding pit must not be less than 600 DEG C, 500 DEG C must not be less than when forging takes out from holding pit；
Using the processing of hydrogen treatment process is expanded after forging, hydrogen and other pernicious gases in forging are removed, forging is heated to 700 DEG C, Temperature is maintained at 690 DEG C -710 DEG C and carries out expanding hydrogen processing more than 30h, comes out of the stove, is expanded when then cooling to less than 300 DEG C with the furnace Hydrogen treated workpiece；
Expand hydrogen treated workpiece, to carry out normalizing spheroidizing, carry out staged heating heat treatment, technique is as follows, a plus Heated work pieces are to 680 DEG C, when heat preservation 1 is small；B, 850 DEG C are heated to, keeps the temperature two hours；C, it is small that 925 DEG C of -935 DEG C of heat preservations 2 are heated to When；D, workpiece is air-cooled to room temperature；
The continuous deoxidation of Electroslag Process, top of the slag continuous uniform add in deoxidier, and adjustment adds in the quantity and speed of deoxidier, makes bearing Oxygen content≤15ppm, nitrogen content≤40ppm in steel GCr15；
Consutrode is to produce to obtain the consutrode of high cleanliness using ripe converter-LF-RH-CCM, is produced in LF In the process using submerged-arc smelting technique and by Al content control below 0.015%, FeO+MnO≤0.5% in refining slag, RH Vacuum degree control passes through bag sealing greatly and prevents that steel pouring process inhales nitrogen and oxygen in below 100ppm.
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