CN106734805A - 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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- CN106734805A CN106734805A CN201611104319.4A CN201611104319A CN106734805A CN 106734805 A CN106734805 A CN 106734805A CN 201611104319 A CN201611104319 A CN 201611104319A CN 106734805 A CN106734805 A CN 106734805A
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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
-
- 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
- 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
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium 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
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
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 comprises the following steps：Converter smelting+LF refining+VD vacuum → continuous cast round billets material → electrode blank heat send annealing → cleaning → electroslag remelting → ESR ingot annealing → forging → forging rear annealing, wherein forge and produced using four fiery modes, first fire time is using jumping-up, the mode of texturing of pulling, second fire time is using heavy reduction forging, the 3rd fire to the 4th fiery forging and molding.The temperature and soaking time of crucial control High temperature diffusion in forging process, forging return stove holding temperature and time per fire time, the control of deflection and final forging temperature per fire time.2~3 grades of the spherodized structure of the Cr6 swaged forging Electro Slag Remelting Steel cold roll roller stocks of present invention production, 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 brought up to 95% by original 75%, and distribution of carbides is tiny, disperse, long service life.
Description
Technical field
The invention belongs to metallurgical technology field, it is related to a kind of Cr6 swaged forgings Electro Slag Remelting Steel cold roll blank forging to deform
Technique.
Background technology
The cold roll material that the country uses before 2008 mainly Cr2, Cr3 and Cr5 series, it is domestic cold to promote
The update of working roll steel is rolled, wearability, roughness retentivity and the anti-roll marks performance of cold roll roller stock is improved, from
Start within 2008 the full special steel in north with Baosteel roll company co-production cold roll steel of the exploitation containing Cr6%.The steel grade roller
Base alloy content is higher, carbide segregation weight, especially big specification roller stock, and ultrasonic examination is difficult to meet and requires, it is qualified to produce
Rate is relatively low.
Cr6% type roller stocks are that on the basis of MC5 steel grades, C slightly has raising, Si and Mo contents increase, and Cr contents increased
1%, because alloy content is higher, steel ingot is also easy to produce serious segregation, and Forging Plasticity is poor, manufactures difficulty larger.Roller stock is used
The carbide network of steel, banding, liquation and field trash, gas, flaw detection etc. require all very strict.Existing Cr6 is added using electric furnace
External refining and the mode Electrode for remelting blank of vacuum outgas, 10.4 tons of (Φ 680mm) electrode ingots are poured into a mould by the way of molding.
Φ 865mm~Φ 960mm electroslag ingots are produced using electroslag remelting mode.Forged using 3000 tons of hydraulic presses, forging is advanced
The treatment 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 produce shrinkage cavity, the first fire time reduction in pass and deformation rate is excessive easily causes body of roll transverse fissure osculum.The second fire time body of roll
Reduction in pass is excessive to easily 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 easily 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 easily causes roll neck internal carbides soon
Analysis area produced fire check.
The content of the invention
It is an object of the invention to provide a kind of 500~650mm of Φ Cr6 swaged forgings Electro Slag Remelting Steel cold roll blank forging
Deformation technique, the product quality stabilization of the technique productions, production testing qualification rate reaches more than 95%.Cr6 type cold rolls
After coming into operation, compared with MC5 cold rolls because the roll change rate that roll marks defect is caused have dropped 10%, improve cold-reduced sheet
Surface quality and milling train operating efficiency.
The purpose of the present invention is 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 following step
Suddenly：Converter smelting+LF refining+VD vacuum → continuous cast round billets material → electrode blank heat send annealing → cleaning → electroslag remelting → electroslag
Ingot annealing → forging → forging rear annealing, wherein：
High temperature homogenization treatment is carried out before forging, heating-up temperature is controlled for 1190 DEG C~1210 DEG C, soaking time is 30~
42h。
Produced using four fiery modes during forging, comprised the following steps that：
First fire：Using the arc upward jumping-up of 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 plus 50mm surpluses, and reduction in pass is 60~80mm, and deformation rate is 25
~30%, return stove and be incubated 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 is carried out between 30~80mm by the way of high temperature stops forging 3 seconds, returns stove soaking time 50~70 minutes, returns furnace temperature
1170~1190 DEG C；
4th fire：Forging other end roll neck, the rest and reorganization body of roll, body of roll deflection between 7~8%, roll neck forging mode and
3rd fire is the same；
Each fire time final forging temperature is 850~900 DEG C above, and less than 900 DEG C is rest and reorganization temperature；
It is heat-treated after forging, is controlled 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 arc upward jumping-up of upset plate Steel ingot feeder head,
The generation of shrinkage cavity is reduced, 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 produced transverse fissure osculum.Second fire
The secondary body of roll pulls out finished product forging's block dimension plus 50mm surpluses, and reduction in pass is 60~80mm, and deformation rate is road between 25~30%
Secondary drafts is reduced, 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 is carried out between 30~80mm by the way of high temperature stops forging 3 seconds, that is, go up when anvil touches forging and pause 3 seconds again
Fire check is crossed in pressure, the internal carbides line of segragation that reduction roll neck is caused because deflection is excessive；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
Between 7~8%, roll neck forges mode as the 3rd fire to deflection.First fire returns stove and is incubated 2.5~3.5h, the second fire
Return stove and be incubated 1~2h, the 3rd fire returns stove 50~70 minutes.Final forging temperature is 850~900 DEG C, and less than 900 DEG C is 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 forging, it is ensured that forging temperature, reduce
Due to the internal cleavage that cryogenic forging is caused.
A diameter of 500~650mm of the Cr6 swaged forging Electro Slag Remelting Steel cold roll roller stocks of present invention production, 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 brought up to 95% by original 75%, and distribution of carbides is tiny, disperse, long service life.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, and the product wide market in the near future can be to enterprise
Industry brings considerable economic benefit.Cr6 types 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.This product is trial-produceed successfully as solid base is established in the update of domestic cold roll material
Plinth.
Brief 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 equivalent, without deviating from the spirit and scope of technical solution of the present invention, all should be covered
In protection scope of the present invention.
The invention provides a kind of 500~650mm of Φ Cr6 swaged forging Electro Slag Remelting Steel cold rolls blank forging deformation work
Skill, produces electrode blank by the way of converter smelting, ladle refining, vacuum outgas, then enters one using electroslag remelting mode
Step cleaning molten steel, by the segregation for controlling the state modulator ESR ingot such as melting rate in esr process.Rational electricity
Slag ingot homogenization temperature and time, using light-heavy-light forging mode during forging, the ESR ingot starting stage touches, then big pressure
The forging of lower amount (30~50mm light reductions touch during direct drawing out after jumping-up, come out of the stove again after stove insulation is returned pulling when can 60~
80mm heavy reductions are forged), each passage mutually upset in 90 °, the body of roll reserves correction, and roll neck is given birth to by the way of finished product at twice
Produce, forging temperature is repaired when being less than 900 DEG C, quick water-spraying control control net carbide after forging.The present invention is by molten steel
Degree of purity, the segregation of ESR ingot, the preceding high temperature homogenization temperature and time of forging, 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 heat send annealing → cleaning → electroslag remelting → ESR ingot
Annealing → forging → forging rear annealing → smooth surface, flaw detection → inspection (high and low times, gas) → submit.
2nd, each production process CCP and know-why 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 first, is specifically shown in Table 1.
Harmful elements Pb, Sn, As, Sb, Bi content are strictly controlled during the smelting selection furnace charge of Cr6 type roller stock steel.Turn
Stove initial smelting period ensures the de- P of molten steel, and priority control terminal C content >=0.12%, prevents Molten Steel over-oxidation in addition；When P content symbol
Close requirement and liquid steel temperature is suitable, carry out slag-stopping tapping using slag retaining cone and control the lower quantity of slag, when slag thickness of slag layer exceedes
150mm will carry out deslagging after deslagging treatment or LF intensifications；Tapping process carries out alloying, and main component control is in lower limit, tapping
Lime and refining slag are heated simultaneously；Ladle to LF refining position after to electricity heat up, heating certain hour after sample, according to analysis result
Adjusting component meets the requirements.When molten steel temperature is suitable, bits are white, deoxidation it is good after carry out vacuum refining.Below the handkerchief of vacuum 67,
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.
The BGCr6 standards of table 1 and blank chemical component requirement (%)
The annealing of B, electroslag remelting and ESR ingot
During electroslag remelting, first have to strengthen the baking to slag charge, it is ensured that the heating-up temperature of slag charge and heat time；And changing
During slag, slag charge will be equably dividedly in some parts, and to ensure slugging quality, metal electrode of being allowed for access after scorification is clear is refined.Especially
It is it is noted that the control of feeding phase operation, to ensure to realize that shrinkage cavity depth minimum, volume are minimum, improves the lumber recovery of ESR ingot.
Control melting rate in esr process according to ingot shape size reasonable, it is ensured that melting rate equalization stable.ESR ingot is annealed
Treatment, cleaning sampling is carried out after annealing, then go to forge plant heated, forging process.
C, heating, forging and heat treatment after forging
ESR ingot loads stove preheating to be expected, after forging temperature is risen to, carries out high temperature homogenization treatment, its purpose is to
Improve or eliminate the uneven components formed in metallurgical process, forged after insulation.Its forging characteristic of Cr6 steel than
MC3 and MC5 are weaker.Using jumping-up, the forging mode of pulling, the requirement of forging ratio >=3 is met, fully crush thick branch
Shape carbide., using jumping-up, the mode of texturing of pulling, using the small deformation amount of 30~50mm during pulling, second is fiery for first fire time
Secondary to be forged using 60~80mm heavy reductions, abundant soldering internal flaw can light reduction finishing when temperature is 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 in forging process, forging is per fire
Return stove holding temperature and time, per fire time deflection and final forging temperature control.
Heat treatment after forging is actually conditioning treatment, and it is it is important that three tasks will be completed：One is to eliminate netted carbonization
Thing, two is to eliminate stress softening tissue to obtain globular pearlite tissue, and three is hydrogen content in steel to be reduced, and prevents the product of white point
It is raw.Therefore, heat treatment cycle curve is also made up 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 research
1st, the determination of forging range
To grope optimal smithing technological parameter, sampling carries out high temperature thermoplasticity experiment on Cr6 type roller stocks, gropes optimal
Forging range, for big production provides theoretical foundation.
Gleeble experiments are carried out using the equipment of GLEEBLE 3500 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, two samples of each 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 rising of shape temperature, resistance of deformation is on a declining curve, to 1100~1200 DEG C between resistance of deformation change it is smaller, curve is in gentle
Trend, deformation temperature drastically declines again more than 1200 DEG C of resistances of deformation.It is seen from fig 5 that 800~1200 DEG C of plasticity compared with
It is good, drastically decline more than 1200 DEG C of plasticity.
Initial forging temperature is general between 1170~1190 DEG C during Cr6 blank forgings, and final forging temperature is controlled at 850~900 DEG C
Between, light reduction finishing is carried out below 900 DEG C.Analysis of experiments discovery according to more than, the forging temperature model that we select
Enclose comparing rationally, 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, the determination of normalizing temperature
In order to verify the netted elevated situation of change with heating-up temperature of Cr6 roller stocks, choose netted 3.5 grades of Cr6 12
Sample, oil cooling in 30 minutes is incubated at a temperature of 6 different heatings and checks netted situation of change, assay to be shown in Table 2.
Table 2
From table 2 it can be seen that with the raising of hardening heat, net level is gradually reduced.950 DEG C are not changed in, 970 DEG C
Improve not substantially, 990 DEG C start to have clear improvement, and in the absence of closing carbide network, 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) when using converter smelting+LF refining+VD vacuum technologies production Φ 650mm electrode bars, LF refining furnace refining is with 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 1300 respectively
~1400kW and 1700~1800kW；Packing stage input power is gradually reduced with being not more than the speed of 100kW/h.
3rd, steel ingot carries out high temperature homogenization treatment before forging, and heating-up temperature is 1190 DEG C~1210 DEG C, soaking time root
Controlled by 30~42h according to ingot shape.
4th, using many fire time forgings, it is divided into four steps：
First fire：Using the arc upward jumping-up of upset plate Steel ingot feeder head, upset ratio is controlled between 1.5~2.0, then adopted
Pulled out with flat anvil, lower V-type anvil, reduction in pass is 30~50mm, 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 plus 50mm surpluses, and reduction in pass is 60~80mm, and deformation rate is 25
~30%.Return stove and be incubated 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 is carried out between 30~80mm by the way of high temperature stops forging 3 seconds.Return stove and be incubated 50~70 minutes, return furnace temperature 1170
~1190 DEG C.
4th fire：Forging other end roll neck, the rest and reorganization body of roll, body of roll deflection between 7~8%, roll neck forging mode and
3rd fire is the same.
Each fire time final forging temperature is 850~900 DEG C above, and less than 900 DEG C is rest and reorganization temperature, is not allow for large deformation.
5th, after 3~4 minutes, air cooling send annealing to water-cooled to heat after 350~400 DEG C after finished product roller stock is forged.
6th, heat treatment after forging process curve is also made up 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.
The Cr6 swaged forging Electro Slag Remelting Steel cold roll roller stock carbide strips and liquation of present invention production 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,
According to flaw detection is required in GB/T13314-2008, credit rating meets A grades of requirement in Table A .2 to roller stock after roughing.
Claims (4)
1. a kind of 500~650mm of Φ Cr6 swaged forgings Electro Slag Remelting Steel cold roll blank forging deformation technique, including following step
Suddenly：Converter smelting+LF refining+VD vacuum → continuous cast round billets material → electrode blank heat send 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 comprised the following steps that：
First fire：Using the arc upward jumping-up of 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 is 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 plus 50mm surpluses, and reduction in pass is 60~80mm, and deformation rate is 25~
30%, return stove and be incubated 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 by the way of high temperature stops forging 3 seconds, return stove soaking time 50~70 minutes, return furnace temperature 1170
~1190 DEG C；
4th fire：Forging other end roll neck, the rest and reorganization body of roll, between 7~8%, roll neck forges mode and the 3rd to body of roll deflection
It is fiery the same；
Each fire time final forging temperature is 850~900 DEG C above, and less than 900 DEG C is 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 treatment is carried out before the forging, controls heating-up temperature for 1190 DEG C~1210 DEG C, during insulation
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.
Priority Applications (1)
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| CN108672625A (en) * | 2018-05-28 | 2018-10-19 | 建龙北满特殊钢有限责任公司 | A kind of processing method producing multi-step cold roll base using diameter forging machine |
| CN108723268A (en) * | 2018-04-19 | 2018-11-02 | 河南中原特钢装备制造有限公司 | Small deformation amount improves the forging method of continuous casting billet forging hollow object General Loosen |
| CN108728606A (en) * | 2018-05-09 | 2018-11-02 | 石家庄钢铁有限责任公司 | A kind of production technology of cold roller steel electroslag blank |
| CN108950134A (en) * | 2018-08-21 | 2018-12-07 | 成都先进金属材料产业技术研究院有限公司 | The remelting method of cold roll ESR ingot |
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| CN108723268A (en) * | 2018-04-19 | 2018-11-02 | 河南中原特钢装备制造有限公司 | Small deformation amount improves the forging method of continuous casting billet forging hollow object General Loosen |
| CN108728606A (en) * | 2018-05-09 | 2018-11-02 | 石家庄钢铁有限责任公司 | A kind of production technology of cold roller steel electroslag blank |
| CN108672625A (en) * | 2018-05-28 | 2018-10-19 | 建龙北满特殊钢有限责任公司 | A kind of processing method producing multi-step cold roll base using diameter forging machine |
| CN108672625B (en) * | 2018-05-28 | 2019-09-27 | 建龙北满特殊钢有限责任公司 | A kind of processing method using diameter forging machine production multi-step cold roll base |
| CN108942093A (en) * | 2018-07-05 | 2018-12-07 | 建龙北满特殊钢有限责任公司 | A kind of economizing type coiler mandrel fanning strip process for manufacturing forging |
| CN108950134A (en) * | 2018-08-21 | 2018-12-07 | 成都先进金属材料产业技术研究院有限公司 | The remelting method of cold roll ESR ingot |
| CN111167986A (en) * | 2020-02-26 | 2020-05-19 | 建龙北满特殊钢有限责任公司 | Forging method for improving net shape of roller blank by using radial forging machine |
| CN111534755A (en) * | 2020-06-17 | 2020-08-14 | 江苏良工精密合金钢有限公司 | High-temperature-resistant water-free roller and preparation method thereof |
| CN111715829A (en) * | 2020-06-29 | 2020-09-29 | 建龙北满特殊钢有限责任公司 | Forging method for improving ultrasonic flaw detection qualification rate of large-step-difference roller blank |
| CN112126743A (en) * | 2020-08-19 | 2020-12-25 | 石钢京诚装备技术有限公司 | Production method of low-aluminum-content Cr5 steel ingot for supporting roll |
| CN112126743B (en) * | 2020-08-19 | 2021-12-14 | 石钢京诚装备技术有限公司 | Production method of low-aluminum-content Cr5 steel ingot for supporting roll |
| CN114410977A (en) * | 2021-12-27 | 2022-04-29 | 河钢股份有限公司 | Preparation method of large-size high-strength invar forging |
| CN114836675A (en) * | 2022-04-20 | 2022-08-02 | 山西太钢不锈钢股份有限公司 | Preparation method of high-end structural steel 30CrMnSiNi2A |
| CN115537640A (en) * | 2022-10-14 | 2022-12-30 | 唐山志威科技有限公司 | ZW931 roller of lithium ion battery pole piece rolling mill and preparation method thereof |
| CN115537640B (en) * | 2022-10-14 | 2023-03-10 | 唐山志威科技有限公司 | ZW931 roller of lithium ion battery pole piece rolling mill and preparation method thereof |
| CN116855703A (en) * | 2023-07-13 | 2023-10-10 | 广东韶铸精锻有限公司 | Forging process method of blank |
| CN116855703B (en) * | 2023-07-13 | 2024-03-08 | 广东韶铸精锻有限公司 | Forging process method of blank |
| CN116949260A (en) * | 2023-09-20 | 2023-10-27 | 成都先进金属材料产业技术研究院股份有限公司 | Steel ingot for P91 seamless steel tube and thermal deformation method thereof |
| CN116949260B (en) * | 2023-09-20 | 2023-12-19 | 成都先进金属材料产业技术研究院股份有限公司 | Steel ingot for P91 seamless steel tube and thermal deformation method thereof |
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