CN107488788B - It is a kind of for producing the dedicated slag system and its preparation and application of 17-4PH steel ingot - Google Patents
It is a kind of for producing the dedicated slag system and its preparation and application of 17-4PH steel ingot Download PDFInfo
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- CN107488788B CN107488788B CN201710637068.4A CN201710637068A CN107488788B CN 107488788 B CN107488788 B CN 107488788B CN 201710637068 A CN201710637068 A CN 201710637068A CN 107488788 B CN107488788 B CN 107488788B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
- C22B9/16—Remelting metals
- C22B9/18—Electroslag remelting
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/076—Use of slags or fluxes as treating agents
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
It is a kind of for producing the dedicated slag system of 17-4PH steel ingot, the dedicated slag system is by following weight percents at being grouped as: Al2O3: 26 ~ 28%, CaO:25 ~ 27%, SiO2: 4 ~ 5%, MgO:5 ~ 6%, surplus CaF2；Its dual alkalinity CaO/SiO2It is 5 ~ 6.75；The fusing hemispherical fusion temperature of the dedicated slag system is 1220 ~ 1250 DEG C；0.402~0.434Ω•cm.Viscosity at 1500 DEG C is 0.0352 ~ 0.0359 Pa s.Slag system fusing point of the invention is lower, resistivity is higher, viscosity with temperature variation is smaller, high-temp plastic is preferable, and basicity is higher, and content of fluoride is low, slugging speed is fast, the requirement that can satisfy stripping formula electroslag remelting process production 17-4PH steel ingot, can guarantee the internal soundness and surface quality of 17-4PH steel ingot, and have the advantages that energy conservation and environmental protection.
Description
Technical field
The invention belongs to field of iron and steel smelting, and in particular to a kind of for producing the energy conservation and environmental protection Special slag of 17-4PH steel ingot
System and its preparation and application.
Background technique
17-4PH alloy is a kind of precipitation hardenable martensitic stain less steel, due to stronger compressive resistance, it is corrosion-resistant,
It is important to be widely used in space flight turbine blade, ocean platform, helicopter deck, nuclear fuel waste bucket etc. for radiation resistance
Field.
The composition characteristic of 17-4PH alloy is containing alloying elements such as higher Cr, Cu, Ni, Nb, and Cr content therein is
It is 3% ~ 5%, Nb content is 0.20% ~ 0.45% that 15.0% ~ 17.5%, Ni content, which are 3% ~ 5%, Cu content,.However, since 17-4PH is closed
Gold causes the viscosity of the steel larger containing alloying elements such as a large amount of Cu, Cr, and the fluidity molten steel in smelting process is very poor, this
So that the Solidification Quality of 17-4PH steel ingot is poor, be easy to appear it is more serious be mingled with, shrinkage cavity, the internal soundnesses such as loose, segregation are asked
Topic, and it be easy to cause the surface quality problems such as surface of steel ingot fold, slag runner.In view of steel hardly possible present in smelting process
Degree generally prepares 17-4PH steel ingot using electro-slag re-melting method, this is because electroslag remelting process may be implemented to be poured and solidify
The separation of journey, not only can to molten steel carry out double refining guarantee molten steel degree of purity, but also can water mold pressure it is cold
But the lower solidified structure compactness for guaranteeing steel ingot of effect, while the slag crust in esr process between steel ingot and crystallizer can
To play preferable lubricating action, to guarantee the surface quality of steel ingot.It can when in order to guarantee electroslag remelting 17-4PH alloy
Make steel ingot that there is excellent internal soundness and surface quality, needs the dedicated pre-melted slag slag system for being suitable for the steel grade, this slag
System needs to meet the feature that fusing point is lower, viscosity is lower.
Currently, slag system needed for production steel is substantially Al2O3, CaO, SiO2, MgO and CaF2Combination, but not
Same proportion is suitable for producing different steel ingots.When being directed to electroslag remelting process production 17-4PH alloy, conventional slag system proportion
Power consumption is higher, and resistivity is lower, is unable to satisfy lubricating function, and surface of steel ingot is caused to will appear the surfaces such as dross, slag runner, pipe matter
Defect is measured, meanwhile, the viscosity with temperature variation in certain temperature range of traditional slag system is also easy to produce mutation, and drawbacks described above can all influence
The cost and quality of 17-4PH steel ingot.
Therefore, it develops a kind of for producing the dedicated slag system and its preparation and application of 17-4PH steel ingot, makes its satisfaction
The characteristics of energy-saving and environmental protection, low melting point, low viscosity is current urgent problem to be solved.
Summary of the invention
When smelting 17-4PH steel ingot there are aiming at the problem that and to slag system requirement, it is an object of the invention to mention
For a kind of for producing the dedicated slag system and its preparation and application of 17-4PH steel ingot, which has low melting point, section
The advantages of energy, good fluidity, reduces the fusing point of slag system and conductivity increases, viscosity with temperature by adjusting the ingredient of slag system
Rate of change it is smaller, and have excellent high-temp plastic.The present invention is in traditional stripping slag system (60%CaF2+20%CaO+20%
Al2O3) on the basis of, the ratio of CaO is improved, main purpose is the fusing point in order to reduce slag, to reach energy-saving mesh
's；But after CaO amount increases, slag is easy the moisture absorbed in air and makes molten steel hydrogenation, therefore also improves the ratio of MgO,
This is because fine and close film can be generated after MgO fusing, can play the role of preventing the moisture absorption；And MgO increase can make the viscous of slag
Degree increases, and mobility reduces, and for the viscosity for reducing slag, improves the SiO in slag2Content.SiO2Another effect be increase
The greasy property and elevated temperature strength of slag, are conducive to going on smoothly for stripping technique.Compared with traditional stripping slag system, slag of the present invention
CaF in system2Content is lower, reduces the fluoride volatilization in smelting process, reduces the pollution to environment.
The object of the present invention is achieved like this: a kind of for producing the dedicated slag system of 17-4PH steel ingot, the dedicated slag system
Ingredient be by weight percentage Al2O3: 26 ~ 28%, CaO:25 ~ 27%, SiO2: 4 ~ 5%, MgO:5 ~ 6%, CaF2Content be 34 ~
40%, dual alkalinity is between 5 ~ 6.75.
Preferably, the dedicated slag system is by following weight percents at being grouped as: Al2O3: 26.2 %, CaO:25.7%,
SiO2: 4.89 %, MgO:5.2 %, surplus CaF2；The dual alkalinity CaO/SiO of slag2It is 5.25.
Preferably, the dedicated slag system is by following weight percents at being grouped as: Al2O3: 27.8%, CaO:26.9%,
SiO2: 4.1%, MgO:5.9%, surplus CaF2；The dual alkalinity CaO/SiO of slag2It is 6.5.
The fusing hemispherical fusion temperature of the dedicated slag system is 1220 ~ 1250 DEG C.
The dedicated slag system produces precipitation hardenable martensitic stain less steel 17-4PH steel ingot for stripping formula electroslag remelting process.
The resistivity that the Special slag ties up to 1600 DEG C is 0.402 ~ 0.434 Ω cm, and the viscosity at 1500 DEG C is 0.0352
~0.0359 Pa•s。
It is a kind of for producing the preparation method of the dedicated slag system of 17-4PH steel ingot, party's the preparation method include the following steps: by
It after fluorite, quick lime, aluminium oxide, fused magnesite, silica mix in proportion, melts and stirs evenly, melted at 1500 ~ 1560 DEG C
Refine 40min or more.
Then it is poured into water cooling slag pan made of steel plate, is cooled to room temperature, being crushed to granularity is 5 ~ 10mm,
The dedicated slag system for being used to produce 17-4PH steel ingot of mentioned component content is made.
It is a kind of for producing the application method of the dedicated slag system of 17-4PH steel ingot, which includes the following steps: head
The slag of slag system of the present invention is first baked to 800 DEG C, and keeps the temperature 10h or more；It is dedicated by what is toasted in esr process
Slag system is warming up to 1600 DEG C or more and melting down in slugging furnace, then refines 20min or so, liquid slag is poured into electroslag furnace
Crystallizer in, will after the consutrode of remelting be inserted into crystallizer in after be powered, make consutrode contact to form energization with clinker
Circuit carries out the fusion process of electroslag remelting 17-4PH, starts stripping operation after forming molten bath after electrode melting.
Show through experimental study: as the Al for containing 26% ~ 28% in slag2O3, CaO:25 ~ 27%, SiO2: 4 ~ 5%, MgO:5 ~ 6%,
CaF2: when 34 ~ 40%, it not only can guarantee that the resistivity value of slag was higher but also slag system fusing point (i.e. fusing hemispherical fusion temperature) can be made lower, glued
Measurement experiment is spent the result shows that the slag system obtained under the conditions of mixture ratios is long slag, and 4 ~ 5% SiO2Content has slag
There are preferable high-temp plastic and intensity, be not easily broken in stripping so as to prevent bleed-out and leak the generation of slag accident, and is somebody's turn to do
The high alkalinity characteristic of slag system inhibits SiO2Activity, the scaling loss of oxidizable element can be prevented.CaF in this slag system2Content compared with
Low and Al2O3Content it is higher, therefore resistivity is higher, advantageously reduces power consumption；The slag system hemispherical fusion temperature ratio ANF-6 slag system
(30% Al2O3, 70%CaF2) about 150 DEG C low (hemispherical fusion temperature of ANF-6 slag system is 1400 DEG C or so)；The viscosity data of the slag system
Also superior to traditional ANF-6 slag, the transition that viscosity changes over time is very gentle, when especially temperature reaches 1400 DEG C or more,
Viscosity with temperature variation is very small, and this slag system can make slag crust have more stable coefficient of friction and intensity, to guarantee slag
Skin thickness is uniformly and continuous, improves the surface quality of electroslag ingot, while can reduce stripping in the process due to slag crust frictional force
It is excessive and cause to leak slag and phenomena such as bleed-out.
Compared with prior art, the present invention has the following technical effect that.
(1) due to CaO and SiO2Content is higher, and slag system of the present invention has lower fusing point, has at the same temperature
Better mobility.
(2) with " long slag " characteristic and preferable elevated temperature strength, i.e., in certain temperature range the viscosity of slag system not with
Temperature change and generate mutation, to ensure that good high-temp plastic, be suitable for stripping formula electroslag refining furnace.
(3) due to Al2O3Content is higher, and the resistivity of slag system is higher, while fusing point is lower, and slugging speed is fast, can play
Preferable energy-saving effect.
(4) basicity is higher, can guarantee the stability of oxidizable element in reflow process.
(5) Calcium Fluoride Content is lower, belongs to low fluorine slag system, can reduce the fluoride volatilization of smelting process, reduce to ring
The harm in border.
Detailed description of the invention
Fig. 1 is to carry out stripping formula electroslag remelting using the product of the embodiment of the present invention 1 to produce ESR ingot surface picture figure.
Fig. 2 is to carry out the ESR ingot surface picture figure that stripping formula electroslag remelting is produced using traditional solid ingot stripping slag system.
Fig. 3 is the Temperature-viscosity curves of the slag system and traditional stripping slag system, tradition ANF-6 slag system in the embodiment of the present invention
Comparison diagram；S1 is the product of embodiment 1 in figure, and S2 is the product of embodiment 3, and S3 is traditional solid ingot stripping slag system, ANF-6
For 70% CaF of tradition2+30% Al2O3Slag system.
Specific embodiment
The fluorite used in the embodiment of the present invention is the high-purity fluorite block of purity by weight >=98%.
Weight content >=92% of CaO in the lime used in the embodiment of the present invention.
Al in the commercial alumina used in the embodiment of the present invention2O3Purity by weight >=99%.
Purity by weight >=98% of MgO in the fused magnesite used in the embodiment of the present invention.
SiO in the silica used in the embodiment of the present invention2Purity by weight >=98%.
Embodiment 1.
Use high-purity fluorite block, lime, industrial alumina powder, fused magnesite and silica for raw material, by ready each original
After material mixing, using electroslag furnace graphite electrode slugging, material continues refining 40 minutes after all melting；Then it is cast to bottom thickness
Degree is after cooled and solidified to room temperature, after crushing using crusher, to filter out the portion that granularity is 5 ~ 10mm in the cast iron plate of 60mm
Point, the pre-melted slag for stripping formula electroslag remelting process production precipitation hardenable martensitic stain less steel 17-4PH steel ingot is obtained, then
It is packaged into mono- bag of 10kg, is used for stripping formula electroslag furnace.
Above-mentioned dedicated slag system is by following weight percents at being grouped as: Al2O3: 26.2 %, CaO:25.7%, SiO2:
4.89 %, MgO:5.2 %, surplus CaF2；The dual alkalinity CaO/SiO of slag2It is 5.25.
The multi-functional electroslag furnace of 300kg using above-mentioned pre-melted slag in special steel Institute of Metallurgical Technology, Northeastern University is tested, first
The slag of slag system of the present invention is baked to 800 DEG C, and keeps the temperature 10h or more；In esr process, the Special slag that will toast
It ties up in slugging furnace and is warming up to 1600 DEG C or more and melting down, then refine 20min or so, liquid slag is poured into electroslag furnace
In crystallizer, it will be powered after the consutrode of remelting is inserted into crystallizer, consutrode is made to contact to be formed with clinker and be powered back
Road carries out the fusion process of electroslag remelting 17-4PH, starts stripping operation after forming molten bath after electrode melting.
When electroslag remelting, the dosage of pre-melted slag is to guarantee that slag bath height is 240 ~ 260kg/ furnace for 260 ~ 280mm calculating
Steel, voltage are 63 ~ 68V, and electric current is 18 ~ 20kA, and melting rate is 800 ~ 970kg/h, the control pulling rate of the smelting furnace used for
10~12 mm/min；Wherein consutrode is the diameter of phi 160mm using the production of AOD furnace technique and through being made；The electricity produced
The defects of slag ingot holds Ingot Surface Quality good having a size of Φ 450mm, no slag runner, dross, pipe, fold, slag inclusion, it is nonmetallic
Field trash total weight content reduces by 69%；The ESR ingot surface picture produced is as shown in Figure 1.
1、Al2O3The screening process of content.
On the basis of the content of embodiment 1, fixed CaO, SiO2, MgO content, be added different content (20 ~ 30%)
Al2O3, surplus CaF2, detection resistance rate and hemispherical fusion temperature, different Al2O3The physical parameter of content slag is shown in Table 1.
The results show that working as Al2O3For content in 26-28%, resistivity and hemispherical fusion temperature can reach the requirement for producing 17-4PH.
2, the screening of CaO content.
On the basis of the content of embodiment 1, fixed Al2O3、SiO2、Different content (20 ~ 30%) are added in the content of MgO
CaO, surplus CaF2, detection resistance rate and hemispherical fusion temperature, the physical parameter of different CaO content slags are shown in Table 2.
The results show that when CaO content is in 25-27%, resistivity is higher and to melt hemispherical fusion temperature lower, can be up to meeting smelting
Refine energy-saving requirement when 17-4PH.
3、SiO2The screening process of content.
On the basis of the content of embodiment 1, fixed Al2O3, CaO, MgO content, be added different content (2 ~ 6%)
SiO2, surplus CaF2 , detection resistance rate and hemispherical fusion temperature, different SiO2The physical parameter of slag when content is shown in Table 3.
The results show that working as SiO2Content has good high-temp plastic and intensity in 4-5%, meets production 17-4PH's
It is required that.
Embodiment 2.
Using the pre-melted slag electroslag remelting 0Cr17Ni4Cu4Nb steel (i.e. 17-4PH) smelted in examples detailed above 1, in Jiangsu
1.5 tons of electroslag furnaces of enterprise are produced.
When this electroslag remelting, by the pre-melted slag directly in crystallizer for electroslag furnace, using solid slag starting the arc technique, this use
The quantity of slag is 30kg, and the slugging time is 30min.Voltage is 57V-58V, electric current 6800A-7500A, crystallizer specification when smelting
For Ф 330mm, electrode bar is the 205mm square rod after intermediate frequency furnace+refining furnace technology is forged.700kg steel ingot is melted in practical remelting,
Fusing time 3 hours.
Produce that the ESR ingot surface quality that finishes is good, the defects of without obvious slag runner, dross, S, P content are lower, with electrode
Material is compared, and the non-metallic inclusion content of ESR ingot reduces about 65%.
Embodiment 3.
After fluorite, quick lime, aluminium oxide, fused magnesite, silica are mixed in proportion, melts and stir evenly, 1500 ~
Melting 43min at 1560 DEG C；Then it is poured into water cooling slag pan made of steel plate, is cooled to room temperature, be crushed to grain
Degree is 5 ~ 10mm, and the dedicated slag system for being used to produce 17-4PH steel ingot of mentioned component content is made.It obtains and is used for stripping formula electroslag
The low pollution energy conservation pre-melted slag of hollow ingot is produced in remelting, is packaged into mono- bag of 20kg, is used for electroslag furnace.
Above-mentioned dedicated slag system is by following weight percents at being grouped as: Al2O3: 27.8%, CaO:26.9%, SiO2:
4.1%, MgO:5.9% configuration, surplus CaF2；The dual alkalinity CaO/SiO of slag2It is 6.5.
Electroslag remelting 17-4PH is produced in Anhui enterprise using above-mentioned pre-melted slag, slugging technique is melt cinder starting, i.e. stone
Then metal electroslag steel is changed in electrode ink slugging first.Technique during smelting are as follows: voltage: 48V~52V；Smelt electric current:
13000-13500A.Melting speed control is in 480kg/h~520kg/h.
Through testing, the ESR ingot surface quality that this slag system is smelted is good, the defects of without obvious slag runner, dross, S, P content compared with
Low, compared with original electrodes material, the A class non-metallic inclusion content of ESR ingot reduces about 62%, B class non-metallic inclusion and contains
Amount, which reduces about 57%, C class non-metallic inclusion content, reduces about 65%.
Comparative example 1.
After fluorite, quick lime, aluminium oxide, fused magnesite, silica are mixed in proportion, melts and stir evenly, 1500 ~
Melting 30min at 1550 DEG C；Then it is poured into water cooling slag pan made of steel plate, is cooled to room temperature, be crushed to grain
Degree is 3 ~ 12mm, and traditional solid ingot stripping slag system is made.
Traditional solid ingot stripping slag system is by following weight percents at being grouped as: Al2O3: 20%, CaO:19.8%,
CaF2: 59% configuration, surplus SiO2。
After fluorite, quick lime, aluminium oxide, fused magnesite, silica are mixed in proportion, melts and stir evenly, 1480 ~
Melting 35min at 1570 DEG C；Then it is poured into water cooling slag pan made of steel plate, is cooled to room temperature, be crushed to grain
Degree is 1 ~ 10mm, and ANF-6 slag system is made.
ANF-6 slag system is by following weight percents at being grouped as: Al2O3: 29%, CaF2: 70% configuration, surplus SiO2。
Embodiment 1, embodiment 3, traditional solid ingot stripping slag system (60%CaF2, 20%Al2O3, 20%CaO), ANF-6
(30% Al2O3, 70%CaF2) physical parameter it is as shown in table 4, viscosity is as shown in table 5 within the scope of 1300 ~ 1500 DEG C.
The results show that embodiment 1 and 3, i.e., the performance of slag system of the present invention is better than traditional solid ingot stripping slag system and ANF-
6。
As seen from the above table, traditional solid ingot is changed greatly with the viscosity with temperature of stripping slag system and ANF-6 slag, and curve is shown in figure
3.Using traditional solid ingot stripping slag system (60%CaF2, 20%Al2O3, 20%CaO) and repeat above-mentioned test, the ESR ingot table produced
Face photo is as shown in Figure 2.Found through productive experiment, the ESR ingot surface quality that traditional slag system is smelted is poor, occur obvious slag runner,
The defects of dross, non-metallic inclusion total weight content are higher.
Comparative example 2.
After fluorite, quick lime, aluminium oxide, fused magnesite, silica are mixed in proportion, melts and stir evenly, 1500 ~
Melting 43min at 1560 DEG C；Then it is poured into water cooling slag pan made of steel plate, is cooled to room temperature, be crushed to grain
Degree is 5 ~ 10mm, and the dedicated slag system for being used to produce 17-4PH steel ingot of mentioned component content is made.It obtains and is used for stripping formula electroslag
The low pollution energy conservation pre-melted slag of hollow ingot is produced in remelting, is packaged into mono- bag of 20kg, is used for electroslag furnace.
Above-mentioned dedicated slag system is by following weight percents at being grouped as: Al2O3: 27.7%, CaO:30%, SiO2: 4.15%,
MgO:5.9% configuration, surplus CaF2；The dual alkalinity CaO/SiO of slag2It is 7.2.
Electroslag remelting 17-4PH is produced in Anhui enterprise using above-mentioned pre-melted slag, slugging technique is melt cinder starting, i.e. stone
Then metal electroslag steel is changed in electrode ink slugging first.Technique during smelting are as follows: voltage: 52V；Smelt electric current: 13000A.It is molten
Speed control is in 4.35kg/min.
Through testing, hydrogen content reaches 4.3ppm in ESR ingot, and the hydrogen content of the steel requires to be 3ppm hereinafter, being unsatisfactory for matter
Amount requires.
Pass through the comparison of comparative example 2, it can be deduced that when CaO content is higher by 25%~27% defined by the present invention, will cause
Obvious moisture absorption phenomenon occurs in fusion process, is unfavorable for the removal of hydrogen in steel.
Comparative example 3.
After fluorite, quick lime, aluminium oxide, fused magnesite, silica are mixed in proportion, melts and stir evenly, 1500 ~
Melting 43min at 1560 DEG C；Then it is poured into water cooling slag pan made of steel plate, is cooled to room temperature, be crushed to grain
Degree is 5 ~ 10mm, and the dedicated slag system for being used to produce 17-4PH steel ingot of mentioned component content is made.It obtains and is used for stripping formula electroslag
The low pollution energy conservation pre-melted slag of hollow ingot is produced in remelting, is packaged into mono- bag of 20kg, is used for electroslag furnace.
Above-mentioned dedicated slag system is by following weight percents at being grouped as: Al2O3: 27.5%, CaO:20%, SiO2: 4.12%,
MgO:5.9% configuration, surplus CaF2；The dual alkalinity CaO/SiO of slag2It is 4.85.
Electroslag remelting 17-4PH is produced in Anhui enterprise using above-mentioned pre-melted slag, slugging technique is melt cinder starting, i.e. stone
Then metal electroslag steel is changed in electrode ink slugging first.Technique during smelting are as follows: voltage: 52V；Smelt electric current: 13000A.It is molten
Speed control is in 4.35kg/min.
Experimental analysis is carried out to the ESR ingot after melting, A class non-metallic inclusion reduces by 45% or so in steel, and B class is nonmetallic
Inclusion content reduces by 30% or so, and C class non-metallic inclusion content reduces about 35%, and the effect of removal of inclusions is significantly lower than this
The slag system of invention.
Pass through the comparison of comparative example 3, it can be deduced that when CaO content is lower than 25%~27% defined by the present invention, be unfavorable for
The removal of steel inclusion.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (5)
1. a kind of for producing the dedicated slag system of 17-4PH steel ingot, it is characterised in that the dedicated slag system is by following weight percents
At being grouped as: Al2O3: 26 ~ 28%, CaO:25 ~ 27%, SiO2: 4 ~ 4.89%, MgO:5.2 ~ 6%, surplus CaF2, dual alkalinity exists
Between 5 ~ 6.75；
The dedicated slag system produces precipitation hardenable martensitic stain less steel 17-4PH steel ingot for stripping formula electroslag remelting process.
2. according to claim 1 a kind of for producing the dedicated slag system of 17-4PH steel ingot, which is characterized in that its feature exists
In the dedicated slag system fusing hemispherical fusion temperature be 1220 ~ 1250 DEG C.
3. according to claim 1 a kind of for producing the dedicated slag system of 17-4PH steel ingot, which is characterized in that the Special slag
The resistivity for tying up to 1600 DEG C is 0.402 ~ 0.434 Ω cm, and the viscosity at 1500 DEG C is 0.0352 ~ 0.0359 Pa s.
4. a kind of as described in claim 1 for producing the preparation method of the dedicated slag system of 17-4PH steel ingot, which is characterized in that
The preparation method includes the following steps: after mixing fluorite, quick lime, aluminium oxide, fused magnesite, silica in proportion that fusing is simultaneously
It stirs evenly, the melting 40min or more at 1500 ~ 1560 DEG C；
Then it is poured into water cooling slag pan made of steel plate, is cooled to room temperature, being crushed to granularity is 5 ~ 10mm, is made
The dedicated slag system for being used to produce 17-4PH steel ingot of mentioned component content.
5. a kind of as described in claim 1 for producing the application method of the dedicated slag system of 17-4PH steel ingot, which is characterized in that
The application method includes the following steps: that the slag of slag system is baked to 800 DEG C first, and keeps the temperature 10h or more；In electroslag remelting mistake
The Special slag toasted is tied up in slugging furnace and is warming up to 1600 DEG C or more and melting down, 20min then refined, by liquid by Cheng Zhong
Clinker is poured into the crystallizer of electroslag furnace, will after the consutrode of remelting be inserted into crystallizer in after be powered, make consutrode with
Clinker contacts to form power circuit, carries out the fusion process of electroslag remelting 17-4PH, starts after forming molten bath after electrode melting
Stripping operation.
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| EP3950173A4 (en) * | 2019-03-26 | 2022-02-09 | Denka Company Limited | Flux used in electroslag remelting method, high-purity steel production method using melt of said flux, and flux production method |
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| CN109182775B (en) * | 2018-08-30 | 2020-11-27 | 河南中原特钢装备制造有限公司 | Martensitic precipitation hardening stainless steel electroslag remelting process |
| EP3950172A4 (en) * | 2019-03-26 | 2022-02-09 | Denka Company Limited | Flux used in electro-slag remelting process, method for producing said flux, and method for producing high-purity steel |
| CN111172403A (en) * | 2020-01-07 | 2020-05-19 | 北京钢研高纳科技股份有限公司 | Pre-melted slag for smelting electroslag remelting continuous directional solidification high-temperature alloy ingot and application thereof |
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