CN106734805B - Φ 500~650mm Cr6 swaged forging Electro Slag Remelting Steel cold roll blank forging deformation techniques - Google Patents
Φ 500~650mm Cr6 swaged forging Electro Slag Remelting Steel cold roll blank forging deformation techniques Download PDFInfo
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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
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
- B21J5/08—Upsetting
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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
- 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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- 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
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium 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
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
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Abstract
The invention discloses a kind of 500~650mm of Φ Cr6 swaged forgings Electro Slag Remelting Steel cold roll blank forging deformation technique, the technique includes the following steps：Converter smelting+LF refining+VD vacuum → continuous cast round billets material → electrode blank hot sending annealing → cleaning → electroslag remelting → ESR ingot annealing → forging → forging rear annealing, wherein forging is produced using four fiery modes, first fire time is using jumping-up, the mode of texturing of pulling, second fire time is forged using heavy reduction, the 3rd fire to the 4th fiery forging and molding.The temperature and soaking time of crucial control High temperature diffusion in forging process, that forges every fire time returns stove holding temperature and time, per the control of the secondary deflection of fire and final forging temperature.2~3 grades of the spherodized structure of Cr6 swaged forgings Electro Slag Remelting Steel cold roll roller stock produced by the invention, carbide network≤2.0 grade, below carbide strip, 1.0 grades of liquation, non-metallic inclusion summation≤2.0 grade, flaw detection qualification rate has been increased to 95% by original 75%, and distribution of carbides is tiny, disperse, and service life is long.
Description
Technical field
The invention belongs to metallurgical technology fields, are related to a kind of Cr6 swaged forgings Electro Slag Remelting Steel cold roll blank forging deformation
Technique.
Background technology
The cold roll material that the country uses before 2008 is mainly Cr2, Cr3 and Cr5 series, domestic cold to promote
It rolls working roll to be updated with steel, improves wearability, roughness retentivity and the anti-roll marks performance of cold roll roller stock, from
Start within 2008 the full special steel in north and cold roll steel of the Baosteel roll company co-production exploitation containing Cr6%.The steel grade roller
Base alloy content is higher, carbide segregation weight, and especially big specification roller stock, ultrasonic examination is difficult to meet the requirements, and production is qualified
Rate is relatively low.
Cr6 type roller stocks are on the basis of MC5 steel grades, and C is slightly improved, Si and Mo contents increase, and Cr contents add
1%, since alloy content is higher, steel ingot is also easy to produce serious segregation, and Forging Plasticity is poor, and it is larger to manufacture difficulty.Roller stock is used
The requirements such as carbide network, banding, liquation and the field trash of steel, gas, flaw detection are all very stringent.Existing Cr6 is added using electric furnace
External refining and the mode Electrode for remelting blank of vacuum outgas pour into a mould 10.4 tons of (Φ 680mm) electrode ingots by the way of molding.
Φ 865mm~Φ 960mm electroslag ingots are produced using electroslag remelting mode.It is forged using 3000 tons of hydraulic presses, forging is advanced
The processing of row high temperature homogenization is produced using the mode of 3 fiery mode finished products, the first fire time upper mounting plate jumping-up, pulling, steel ingot end
Easily generate shrinkage cavity, the first fire time reduction in pass and deformation rate is excessive be easy to cause body of roll transverse fissure osculum.The second fire time body of roll
Reduction in pass is excessive to be easy to cause body of roll transverse fissure osculum, when roll neck deforms between 800~900 DEG C, roll neck deformation rate is excessive,
Deformation temperature is too low to be easy to cause internal carbides line of segragation cracking.3rd fire time body of roll deflection is smaller, body of roll coarse grains,
Carbide network is serious.Roll neck deformation temperature is high, and it is inclined that local deformation rate is big, deformation velocity be easy to cause roll neck internal carbides soon
Analysis area generated fire check.
The content of the invention
The object of the present invention is to provide a kind of 500~650mm of Φ Cr6 swaged forgings Electro Slag Remelting Steel cold roll blank forgings
Deformation technique, the product quality of the technique productions are stablized, and production testing qualification rate reaches more than 95%.Cr6 type cold rolls
It is compared after coming into operation with MC5 cold rolls since roll change rate has dropped 10% caused by roll marks defect, improves cold-reduced sheet
Surface quality and milling train work efficiency.
The purpose of the present invention is what is be achieved through the following technical solutions：
A kind of 500~650mm of Φ Cr6 swaged forgings Electro Slag Remelting Steel cold roll blank forging deformation technique, including walking as follows
Suddenly：Converter smelting+LF refining+VD vacuum → continuous cast round billets material → electrode blank hot sending annealing → cleaning → electroslag remelting → electroslag
Ingot annealing → forging → forging rear annealing, wherein：
High temperature homogenization processing is carried out before forging, control heating temperature as 1190 DEG C~1210 DEG C, soaking time is 30~
42h。
It is produced, is as follows using four fiery modes during forging：
First fire：Using the upward jumping-up of arc upset plate Steel ingot feeder head, upset ratio is controlled between 1.5~2.0, then adopted
With flat anvil, lower V-type anvil pull out, reduction in pass be 30~50mm, deformation rate be 15~20%, return stove soaking time 2.5~
3.5h returns 1190~1210 DEG C of furnace temperature；
Second fire：The body of roll pulls out finished product forging's block dimension and adds 50mm surpluses, and reduction in pass is 60~80mm, deformation rate 25
~30%, it returns stove and keeps the temperature 1~2h, return 1170~1190 DEG C of furnace temperature；
3rd fire：Upper flat anvil is constant, and lower anvil forges one end roll neck using small V-type anvil, and deformation rate is 20~60%, passage pressure
Lower amount carries out in a manner that high temperature stops forging 3 seconds between 30~80mm, returns stove soaking time 50~70 minutes, return furnace temperature
1170~1190 DEG C；
4th fire：Forge other end roll neck, the rest and reorganization body of roll, body of roll deflection between 7~8%, roll neck forging method and
3rd fire is the same；
Above each fire time final forging temperature is 850~900 DEG C, and less than 900 DEG C are rest and reorganization temperature；
It is heat-treated after forging, controls normalizing temperature：1020℃；Spheroidizing temperature：840℃、740℃：Expand hydrogen to move back
Fiery temperature：680℃.
The present invention is produced in forging using four fiery modes, and the first fire uses the upward jumping-up of arc upset plate Steel ingot feeder head,
Reduce the generation of shrinkage cavity, while improve lumber recovery；And first fire time reduction in pass be reduced to 30 by 80~100mm~
50mm light reductions are touched, and deformation rate is also reduced to 15~20% by 25~30%, are reduced the body of roll and are generated transverse fissure osculum.Second fire
The secondary body of roll pulls out finished product forging's block dimension and adds 50mm surpluses, and reduction in pass is 60~80mm, between deformation rate is 25~30%, road
Secondary drafts reduces, and reduces the generation of body of roll crackle.3rd fire time forging one end roll neck, deformation rate is 20~60%, road
Secondary drafts carries out between 30~80mm in a manner that high temperature stops forging 3 seconds, i.e., upper anvil pauses 3 seconds again when touching forging
Pressure reduces roll neck internal carbides line of segragation caused by since deflection is excessive and crosses fire check；Roll neck deformation temperature 900 DEG C with
On, reduce the internal cleavage that roll neck is formed due to cryogenic forging.4th fire time forging other end roll neck, the rest and reorganization body of roll, the body of roll
Deflection is between 7~8%, and roll neck forging method is as the 3rd fire.First fire returns stove and keeps the temperature 2.5~3.5h, the second fire
It returns stove and keeps the temperature 1~2h, the 3rd fire returns stove 50~70 minutes.Final forging temperature is 850~900 DEG C, and less than 900 DEG C are rest and reorganization temperature,
It is not allow for large deformation.Increase by 1 fire, the roll neck of the second fire forging is changed to the 3rd fire and is forged, ensures forging temperature, reduces
Due to internal cleavage caused by cryogenic forging.
A diameter of 500~650mm of Cr6 swaged forgings Electro Slag Remelting Steel cold roll roller stock produced by the invention, spherodized structure 2
~3 grades, carbide network≤2.0 grade, below carbide strip, 1.0 grades of liquation, non-metallic inclusion summation≤2.0 grade, flaw detection
Qualification rate has been increased to 95% by original 75%, and distribution of carbides is tiny, disperse, and service life is long.It is domestic at present precious
The large-sized rolling mills of the Large Steel ironworks such as steel, Shoudu Iron and Steel Co, Anshan iron and steel plant start the cold roll using Cr6 section bar matter, using effect compared with
Good, Cr6 types roller stock will progressively replace MC5 series cold rolls, the product wide market, can give enterprise in the near future
Industry brings considerable economic benefit.Cr6 type roller stock ton steel profit is 4200 yuan or so, and the full year output in north is 2000 tons of left sides at present
The right side can make a profit 8,400,000 yuan every year.Trial-produceing successfully for this product establishes solid base for the update of domestic cold roll material
Plinth.
Description of the drawings
Fig. 1 is 1 grade of Cr6 roller stocks Cold Roll, the high power picture of 0 grade of liquation (100 ×)；
Fig. 2 is the high power picture of 1 grade of Cr6 roller stocks net carbide (500 ×)；
Fig. 3 is the high power picture of 2 grades of Cr6 roller stocks spherodized structure (500 ×)；
Fig. 4 is the high temperature hot deformation resistance curve of Cr6；
Fig. 5 is the high-temp plastic figure of Cr6.
Specific embodiment
Technical scheme is further described below in conjunction with the accompanying drawings, but is not limited thereto, it is every to this
Inventive technique scheme is modified or replaced equivalently, and without departing from the spirit and scope of technical solution of the present invention, should all be covered
In protection scope of the present invention.
The present invention provides a kind of 500~650mm of Φ Cr6 swaged forging Electro Slag Remelting Steel cold rolls blank forgings to deform work
Skill produces electrode blank by the way of converter smelting, ladle refining, vacuum outgas, then using electroslag remelting mode into one
Cleaning molten steel is walked, by the segregation for controlling the state modulators ESR ingot such as melting rate in esr process.Rational electricity
Slag ingot homogenization temperature and time, using the forging method of light-weight-light during forging, ESR ingot starting stage touch, then big pressure
The forging of lower amount (30~50mm light reductions are touched during direct drawing out after jumping-up, come out of the stove again after stove heat preservation is returned pulling when can 60~
80mm heavy reductions forge), each passage mutually overturning in 90 °, the body of roll reserves correction amount, and roll neck is given birth to by the way of finished product at twice
Production, forging temperature are modified when being less than 900 DEG C, quick water-spraying control control net carbide after forging.The present invention passes through to molten steel
Degree of purity, ESR ingot segregation, forging before high temperature homogenization temperature and time, forging deformation process, final forging temperature and controll cooling after forging,
Heat treatment after forging etc. carries out priority control, and product is finally trial-produceed successfully, and the high power photo of product is shown in Fig. 1-Fig. 3.Particular technique side
Case is as follows：
First, production process route is as follows：
Converter smelting+LF+VD → continuous cast round billets material → electrode blank hot sending annealing → cleaning → electroslag remelting → ESR ingot
Annealing → forging → forging rear annealing → smooth surface, flaw detection → inspection (high and low times, gas) → are submitted.
2nd, each production process critical control point and technical principle are as follows：
A, converter smelting and LF refining+VD vacuum
For the chemical composition requirement of Cr6 type roller stocks, and consider to carry out the scaling loss of easy scaling loss element during electroslag remelting
Amount, sets the internal control batch components of the steel grade, is specifically shown in Table 1 first.
Cr6 types roller stock is selected strictly to control harmful elements Pb, Sn, As, Sb, Bi content during furnace charge with the smelting of steel.Turn
Stove initial smelting period ensures that molten steel takes off P, and in addition priority control terminal C content >=0.12%, prevents Molten Steel over-oxidation；When P content accords with
It closes requirement and liquid steel temperature is suitable, slag-stopping tapping is carried out using slag retaining cone and control the lower quantity of slag, when slag thickness of slag layer is more than
150mm will carry out deslagging after deslagging processing or LF heatings；Tapping process carries out alloying, and main component control is in lower limit, tapping
Heat lime and refining slag simultaneously；Ladle is to electricity heating is given behind LF refining position, and heating samples after a certain period of time, according to analysis result
Adjusting component meets the requirements.When molten steel temperature is suitable, bits are white, deoxidation well carries out vacuum refining afterwards.Below 67 pa of vacuum degree,
It is kept for 15 minutes, soft argon blowing 15 minutes after vacuum breaker.Continuous casting electrode blank selects the suitable casting degree of superheat in process of production
And pulling rate.Electrode blank is annealed, and annealing is cleared up after coming out of the stove, and carries out electroslag remelting.
1 BGCr6 standards of table and blank chemical component requirement (%)
B, electroslag remelting and ESR ingot annealing
During electroslag remelting, first have to strengthen the baking to slag charge, it is ensured that the heating temperature of slag charge and heating time；And changing
During slag, slag charge will equably be added portionwise, and to ensure slugging quality, metal electrode of being allowed for access after scorification is clear is refined.Especially
It, to ensure to realize that shrinkage cavity depth is minimum, volume is minimum, improves the lumber recovery of ESR ingot it is noted that the control of feeding phase operation.
According to the control melting rate of ingot shape size reasonable in esr process, ensure melting rate equalization stable.ESR ingot is annealed
Processing, carry out cleaning sampling after annealing, then go to forge plant heated, forging process.
C, heating, forging and heat treatment after forging
ESR ingot is packed into stove preheating to be expected, after forging temperature is risen to, carries out high temperature homogenization processing, its purpose is to
Improve or eliminate the uneven components formed in metallurgical process, forged after heat preservation.Its forging characteristic of Cr6 steel than
MC3 and MC5 are weaker.Using jumping-up, the forging method of pulling, meet the requirement of forging ratio >=3, fully broken coarse branch
Shape carbide.First fire time is using jumping-up, the mode of texturing of pulling, using the small deformation amount of 30~50mm, the second fire during pulling
Secondary that the forging of 60~80mm heavy reductions can be used, abundant soldering internal flaw, temperature can light reduction finishing when being less than 900 DEG C.
3rd fire to the 4th fiery forging and molding.The temperature and soaking time of crucial control High temperature diffusion, are forged per fire in forging process
Return stove holding temperature and time, per fire time deflection and final forging temperature control.
Heat treatment after forging is actually conditioning treatment, and emphasis is to complete three tasks：First, eliminate netted carbonization
Object second is that eliminating stress softening tissue obtains globular pearlite tissue, third, to reduce hydrogen content in steel, prevents the production of white point
It is raw.Therefore, heat treatment cycle curve is also made of three parts：Normalizing+spheroidizing+expansion hydrogen annealing.Annealing process by
Two sections of compositions, the molten disconnected effect of carbide is played in 840 DEG C of nodularizations, and 740 DEG C of nodularization then determines final nodularization effect.
3rd, process parameter test is studied
1st, forging range is definite
To grope optimal smithing technological parameter, the sampling progress high temperature thermoplasticity experiment on Cr6 type roller stocks is groped optimal
Forging range, provide theoretical foundation for big production.
Gleeble experiments are carried out using 3500 equipment of GLEEBLE at different temperature.Specific test temperature is as follows：Choosing
Select 800 DEG C, 850 DEG C, 900 DEG C, 950 DEG C, 1000 DEG C, 1050 DEG C, 1100 DEG C, 1120 DEG C, 1140 DEG C, 1160 DEG C, 1180 DEG C,
1200 DEG C, 1220 DEG C, 1240 DEG C amount to 14 different temperatures, each two samples of temperature.
As seen in Figure 4, at 850 DEG C, resistance of deformation is larger, and resistance of deformation drastically declines at 900 DEG C, with change
The rise of shape temperature, resistance of deformation is on a declining curve, to 1100~1200 DEG C between resistance of deformation variation it is smaller, curve is in gentle
Trend, deformation temperature are more than that 1200 DEG C of resistances of deformation drastically decline again.It is seen from fig 5 that 800~1200 DEG C of plasticity compared with
Good, more than 1200 DEG C plasticity drastically decline.
Generally between 1170~1190 DEG C, final forging temperature is controlled at 850~900 DEG C initial forging temperature during Cr6 blank forgings
Between, light reduction finishing is carried out below 900 DEG C.It is found according to above analysis of experiments, the forging temperature model that we select
Enclose that comparison is reasonable, substantial amounts of production practices also fully demonstrate the reasonability of Cr6 type blank forgings temperature range selection, high temperature modeling
Property experiment theoretical foundation further is provided to the forging temperature reasonability of Cr6 type roller stocks.
2nd, normalizing temperature is definite
In order to verify the netted raised situation of change with heating temperature of Cr6 roller stocks, choose netted 3.5 grades of Cr6 12
Sample keeps the temperature oil cooling in 30 minutes at a temperature of 6 different heatings and examines netted situation of change, and inspection result is shown in Table 2.
Table 2
From table 2 it can be seen that with the raising of hardening heat, net level continuously decreases.950 DEG C do not change, 970 DEG C
Improve unobvious, 990 DEG C start to have clear improvement, and there is no closing carbide networks, and 1050 DEG C netted to be reduced to 1.5 grades.
Because soaking time is shorter during experiment, therefore present invention normalizing temperature in production selects 1020 DEG C.
4th, 500~650mm of Φ Cr6 swaged forgings Electro Slag Remelting Steel cold roll roller stock manufacturing process is as follows：
1st, the chemical Composition Control of steel exists：C：0.85~0.95%, Mn：0.20~0.50%, Si：0.80~1.20%,
S：≤ 0.015%, P：≤ 0.020%, Cr：5.50~6.00%, Mo：0.30~0.50%, V：0.05~0.15%, oxygen content
≤20×10-6, hydrogen content≤1.5 × 10-6, nitrogen content≤120 × 10-6, remaining is Fe.
2nd, steel is smelted using converter smelting+LF refining+VD vacuum+ESR electro-slag re-melting methods, electroslag ingot：Φ 865~
960mm；
(1) using converter smelting+LF refining+VD vacuum technologies production Φ 650mm electrode bars when, LF refining furnace refining is in vain
Slag method, soft blow argon >=15 minute after the degassing of VD stoves.
(2) in the smelting of Φ 865mm and Φ 960mm electroslag ingots, electrode bar remelting input power is controlled respectively 1300
~1400kW and 1700~1800kW；Packing stage input power is continuously decreased with being not more than the speed of 100kW/h.
3rd, steel ingot carries out high temperature homogenization processing before forging, and heating temperature is 1190 DEG C~1210 DEG C, soaking time root
It is controlled according to ingot shape by 30~42h.
4th, using more fire time forgings, it is divided into four steps：
First fire：Using the upward jumping-up of arc upset plate Steel ingot feeder head, upset ratio is controlled between 1.5~2.0, then adopted
It is pulled out with flat anvil, lower V-type anvil, reduction in pass is 30~50mm, and deformation rate is 15~20%.Stove is returned according to steel ingot size to protect
Between warm 2.5~3.5h of time, 1190~1210 DEG C of furnace temperature is returned.
Second fire：The body of roll pulls out finished product forging's block dimension and adds 50mm surpluses, and reduction in pass is 60~80mm, deformation rate 25
~30%.It returns stove and keeps the temperature 1~2h, return 1170~1190 DEG C of furnace temperature.
3rd fire：Upper flat anvil is constant, and lower anvil forges one end roll neck using small V-type anvil, and deformation rate is 20~60%, passage pressure
Lower amount carries out between 30~80mm in a manner that high temperature stops forging 3 seconds.It returns stove and keeps the temperature 50~70 minutes, return furnace temperature 1170
~1190 DEG C.
4th fire：Forge other end roll neck, the rest and reorganization body of roll, body of roll deflection between 7~8%, roll neck forging method and
3rd fire is the same.
Above each fire time final forging temperature is 850~900 DEG C, and less than 900 DEG C are rest and reorganization temperature, are not allow for large deformation.
5th, water cooling after 3~4 minutes, is heat-fed annealing after the forging of finished product roller stock after air-cooled to 350~400 DEG C.
6th, heat treatment after forging process curve is also made of three parts：1020 DEG C of normalizing；Spheroidizing：840 DEG C of carbide
Molten disconnected, 740 DEG C form globular carbide and grow up, and 680 DEG C of expansion hydrogen and globular carbide are further grown up.
Cr6 swaged forgings Electro Slag Remelting Steel cold roll roller stock carbide strip produced by the invention and liquation are according to GB/
The 8th, 9 rank figures are assessed as≤1.0 grades in T18254-2002 standards, and net carbide is according in GB/T1299-2014 standards
Three rank figures are assessed as≤2.0 grades, and spherodized structure is assessed as 2 grades -3 grades according to second level figure in GB/T1299-2014 standards,
For roller stock after roughing according to requiring to detect a flaw in GB/T13314-2008, credit rating meets A grades of requirements in Table A .2.
Claims (4)
1. a kind of 500~650mm of Φ Cr6 swaged forgings Electro Slag Remelting Steel cold roll blank forging deformation technique, including walking as follows
Suddenly：Converter smelting+LF refining+VD vacuum → continuous cast round billets material → electrode blank hot sending annealing → cleaning → electroslag remelting → electroslag
Ingot annealing → forging → forging rear annealing, it is characterised in that the forging is produced using four fiery modes, is as follows：
First fire：Using the upward jumping-up of arc upset plate Steel ingot feeder head, upset ratio is controlled between 1.5~2.0, then using upper
Flat anvil, the pulling of lower V-type anvil, reduction in pass are 30~50mm, and deformation rate is 15~20%, returns stove 2.5~3.5h of soaking time,
Return 1190~1210 DEG C of furnace temperature；
Second fire：The body of roll pulls out finished product forging's block dimension and adds 50mm surpluses, and reduction in pass is 60~80mm, deformation rate for 25~
30%, it returns stove and keeps the temperature 1~2h, return 1170~1190 DEG C of furnace temperature；
3rd fire：Upper flat anvil is constant, and lower anvil forges one end roll neck using small V-type anvil, and deformation rate is 20~60%, reduction in pass
Between 30~80mm, carried out in a manner that high temperature stops forging 3 seconds, return stove soaking time 50~70 minutes, return furnace temperature 1170
~1190 DEG C；
4th fire：Other end roll neck is forged, the rest and reorganization body of roll, body of roll deflection is between 7~8%, roll neck forging method and the 3rd
It is fiery the same；
Above each fire time final forging temperature is 850~900 DEG C, and less than 900 DEG C are rest and reorganization temperature.
2. 500~650mm of Φ Cr6 swaged forging Electro Slag Remelting Steel cold rolls blank forging according to claim 1 deforms work
Skill, it is characterised in that high temperature homogenization processing is carried out before the forging, it is 1190 DEG C~1210 DEG C control heating temperature, during heat preservation
Between be 30~42h.
3. 500~650mm of Φ Cr6 swaged forging Electro Slag Remelting Steel cold rolls blank forging according to claim 1 deforms work
Skill, it is characterised in that be heat-treated after the forging, it is 1020 DEG C to control normalizing temperature.
4. 500~650mm of Φ Cr6 swaged forging Electro Slag Remelting Steel cold rolls blank forging according to claim 1 deforms work
Skill, it is characterised in that the chemical Composition Control of the Cr6 swaged forgings Electro Slag Remelting Steel cold roll roller stock exists：C：0.85~
0.95%th, Mn：0.20~0.50%, Si：0.80~1.20%, S：≤ 0.015%, P：≤ 0.020%, Cr：5.50~
6.00%th, Mo：0.30~0.50%, V：0.05~0.15%, oxygen content≤20 × 10-6, hydrogen content≤1.5 × 10-6, nitrogen contains
Amount≤120 × 10-6, remaining is Fe.
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| CN108728606B (en) * | 2018-05-09 | 2020-09-29 | 石家庄钢铁有限责任公司 | Production process of cold roll steel electroslag blank |
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