CN107488788A - A kind of special slag system and its preparation and application for being used to produce 17 4PH steel ingots - Google Patents
A kind of special slag system and its preparation and application for being used to produce 17 4PH steel ingots Download PDFInfo
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- CN107488788A CN107488788A CN201710637068.4A CN201710637068A CN107488788A CN 107488788 A CN107488788 A CN 107488788A CN 201710637068 A CN201710637068 A CN 201710637068A CN 107488788 A CN107488788 A CN 107488788A
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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
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Abstract
A kind of special slag system for being used to produce 17 4PH steel ingots, the special slag system are made up of the composition of following weight percents：Al2O3：26 ~ 28%, CaO：25 ~ 27%, SiO2：4 ~ 5%, MgO：5 ~ 6%, surplus CaF2；Its dual alkalinity CaO/SiO2For 5 ~ 6.75；The fusing hemispherical fusion temperature of the special slag system is 1220 ~ 1250 DEG C；0.402~0.434Ω•cm.Viscosity at 1500 DEG C is 0.0352 ~ 0.0359 Pa s.The slag system fusing point of the present invention is relatively low, resistivity is higher, viscosity with temperature change is smaller, high-temp plastic is preferable, and basicity is higher, and content of fluoride is low, slugging speed is fast, it disclosure satisfy that stripping formula electroslag remelting process produces the requirement of 17 4PH steel ingots, the internal soundness and surface quality of 17 4PH steel ingots can be ensured, and there is the advantages of saving and be environmentally friendly.
Description
Technical field
The invention belongs to field of iron and steel smelting, and in particular to a kind of energy-conserving and environment-protective Special slag for being used to produce 17-4PH steel ingots
System and its preparation and application.
Background technology
17-4PH alloys are a kind of precipitation hardenable martensitic stain less steels, due to stronger compressive resistance, it is corrosion-resistant,
Radiation resistance, it is important to be widely used in space flight turbine blade, ocean platform, helicopter deck, nuclear fuel waste bucket etc.
Field.
The composition characteristic of 17-4PH alloys is to be containing the alloying elements such as higher Cr, Cu, Ni, Nb, Cr contents therein
15.0% ~ 17.5%, Ni content are that 3% ~ 5%, Cu contents are that 3% ~ 5%, Nb contents are 0.20% ~ 0.45%.However, because 17-4PH is closed
Gold causes the viscosity of the steel larger containing alloying elements such as substantial amounts of Cu, Cr, and the fluidity molten steel in smelting process is very poor, this
So that the Solidification Quality of 17-4PH steel ingots is poor, easily occur it is more serious be mingled with, shrinkage cavity, the internal soundness such as loose, segregation are asked
Topic, and easily cause the surface quality problems such as surface of steel ingot fold, slag runner.In view of the steel is difficult present in smelting process
Degree, 17-4PH steel ingots are typically prepared using electro-slag re-melting method, this is due to that electroslag remelting process can realize cast and solidify
The separation of journey, both can to molten steel carry out double refining ensure molten steel degree of purity, again can water mold pressure it is cold
But the lower solidified structure compactness for ensureing steel ingot of effect, while the slag crust in esr process between steel ingot and crystallizer can
To play preferable lubrication, so as to ensure the surface quality of steel ingot.Can during in order to ensure electroslag remelting 17-4PH alloys
Make steel ingot that there is excellent internal soundness and surface quality, it is necessary to have the special pre-melted slag slag system for being suitable for the steel grade, this slag
System needs to meet the characteristics of fusing point is relatively low, viscosity is relatively low.
At present, the slag system produced needed for steel is substantially Al2O3, CaO, SiO2, MgO and CaF2Combination, but not
Same proportioning is applied to produce different steel ingots.When being directed to electroslag remelting process production 17-4PH alloys, conventional slag system proportioning
Power consumption is higher, and resistivity is relatively low, can not meet lubricating function, causes surface of steel ingot that the surface such as dross, slag runner, pipe matter occurs
Defect is measured, meanwhile, the viscosity with temperature change 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 ingots.
Therefore, a kind of special slag system and its preparation and application for being used to produce 17-4PH steel ingots is developed, makes its satisfaction
The characteristics of energy-saving and environmental protection, low melting point, low viscosity, it is current urgent problem to be solved.
The content of the invention
For smelt 17-4PH steel ingots when exist the problem of and to slag system requirement, it is an object of the invention to carry
For a kind of special slag system and its preparation and application for being used to produce 17-4PH steel ingots, the special slag system has low melting point, section
The advantages of energy, good fluidity, by adjusting the composition of slag system, reduce the fusing point of slag system and electrical conductivity increases, viscosity with temperature
Rate of change it is smaller, and there is excellent high-temp plastic.The present invention is in traditional stripping slag system（60%CaF2+20%CaO+20%
Al2O3）On the basis of, CaO ratio is improved, main purpose is in order to reduce the fusing point of slag, to reach energy-saving mesh
's；But after the increase of CaO amounts, moisture in the easy absorption air of slag and make molten steel hydrogenation, therefore also improve MgO ratio,
Because the film of densification can be produced after MgO fusings, can play a part of preventing the moisture absorption；And MgO increases can make the viscous of slag
Degree increase, mobility reduce, and to reduce the viscosity of slag, improve the SiO in slag2Content.SiO2Another effect be increase
The greasy property and elevated temperature strength of slag, are advantageous to being smoothed out for stripping technique.Compared with traditional stripping slag system, slag of the present invention
CaF in system2Content is relatively low, 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 special slag system for being used to produce 17-4PH steel ingots, the special slag system
Composition be Al by weight percentage2O3：26 ~ 28%, CaO：25 ~ 27%, SiO2：4 ~ 5%, MgO：5 ~ 6%, CaF2Content be 34 ~
40%, dual alkalinity is between 5 ~ 6.75.
Preferably, the special slag system is made up of the composition of following weight percents：Al2O3：26.2 %, CaO：25.7%,
SiO2：4.89 %, MgO：5.2 %, surplus CaF2；The dual alkalinity CaO/SiO of slag2For 5.25.
Preferably, the special slag system is made up of the composition of following weight percents：Al2O3：27.8%, CaO：26.9%,
SiO2：4.1%, MgO：5.9%, surplus CaF2；The dual alkalinity CaO/SiO of slag2For 6.5.
The fusing hemispherical fusion temperature of the special slag system is 1220 ~ 1250 DEG C.
The special slag system is used for stripping formula electroslag remelting process production precipitation hardenable martensitic stain less steel 17-4PH steel ingots.
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。
A kind of preparation method for being used to produce the special slag system of 17-4PH steel ingots, the party prepare method and comprised the following steps：Will
After fluorite, quick lime, aluminum oxide, fused magnesite, silica mix in proportion, melt and stir, melted at 1500 ~ 1560 DEG C
Refine more than 40min.
Then it is poured into made of steel plate in water cooling slag pan, is cooled to room temperature, it is 5 ~ 10mm to be crushed to granularity,
The special slag system for being used to produce 17-4PH steel ingots of mentioned component content is made.
A kind of application method for being used to produce the special slag system of 17-4PH steel ingots, the application method comprise the following steps：It is first
The slag of slag system of the present invention is first baked to 800 DEG C, and is incubated more than 10h；It is special by what is toasted in esr process
Slag system is warming up to more than 1600 DEG C and melting down in slugging stove, then refines 20min or so, liquid slag is poured into electroslag furnace
Crystallizer in, will after the consutrode of remelting insert crystallizer in after be powered, make consutrode contact to form energization with clinker
Loop, electroslag remelting 17-4PH fusion process is carried out, start stripping operation after molten bath is formed 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 can not only ensure that the resistivity value of slag is higher but also can make slag system fusing point（Melt hemispherical fusion temperature）It is relatively low, glue
The degree determination experiment result slag system that shows to obtain 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 be 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 is than ANF-6 slag system
（30% Al2O3, 70%CaF2）Low about 150 DEG C（The hemispherical fusion temperature of ANF-6 slag systems is 1400 DEG C or so）；The viscosity data of the slag system
Also superior to traditional ANF-6 slags, the transition that viscosity changes over time is very gentle, when especially temperature reaches more than 1400 DEG C,
Viscosity with temperature change is very small, and this slag system can make slag crust have relatively stable coefficient of friction and intensity, so as to ensure slag
Skin thickness is uniformly and continuous, improves the surface quality of electroslag ingot, while can reduce during stripping 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 relatively low fusing point, has at the same temperature
More preferable mobility.
（2）Characteristic and preferable elevated temperature strength with " long slag ", i.e., in certain temperature range the viscosity of slag system not with
Temperature change and produce mutation, so as to ensure that good high-temp plastic, 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 relatively low, and slugging speed is fast, can play
Preferable energy-saving effect.
（4）Basicity is higher, can ensure the stability of oxidizable element in reflow process.
（5）Calcium Fluoride Content is relatively low, belongs to low fluorine slag system, can reduce the fluoride volatilization of smelting process, reduce to ring
The harm in border.
Brief description of the drawings
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 the ESR ingot surface picture figure produced using traditional solid ingot stripping slag system progress stripping formula electroslag remelting.
Fig. 3 is slag system and traditional stripping slag system, the Temperature-viscosity curves of traditional ANF-6 slag systems 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.
Embodiment
The fluorite used in the embodiment of the present invention for purity by weight >=98% high-purity fluorite block.
CaO weight content >=92% 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%.
MgO purity by weight >=98% 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.
High-purity fluorite block, lime, industrial alumina powder, fused magnesite and silica are used as 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
Spend in the cast iron plate for 60mm, after cooled and solidified to room temperature, after being crushed using disintegrating machine, filter out the portion that granularity is 5 ~ 10mm
Point, the pre-melted slag for stripping formula electroslag remelting process production precipitation hardenable martensitic stain less steel 17-4PH steel ingots is obtained, then
Mono- bag of 10kg is packaged into, is used for stripping formula electroslag furnace.
Above-mentioned special slag system is made up of the composition of following weight percents：Al2O3：26.2 %, CaO：25.7%, SiO2：
4.89 %, MgO：5.2 %, surplus CaF2；The dual alkalinity CaO/SiO of slag2For 5.25.
Tested using 300kg multi-functional electroslag furnace of the above-mentioned pre-melted slag in special steel Institute of Metallurgical Technology of Northeastern University, first
The slag of slag system of the present invention is baked to 800 DEG C, and is incubated more than 10h；In esr process, the Special slag that will toast
Tie up in slugging stove and be warming up to more than 1600 DEG C 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 in crystallizer, and consutrode is contacted to be formed with clinker and is powered back
Road, electroslag remelting 17-4PH fusion process is carried out, start stripping operation after molten bath is formed after electrode melting.
During electroslag remelting, the dosage of pre-melted slag is highly calculated with ensureing slag bath for 260 ~ 280mm, is 240 ~ 260kg/ stoves
Steel, voltage are 63 ~ 68V, and electric current is 18 ~ 20kA, and melting rate is 800 ~ 970kg/h, the smelting furnace used control pulling rate for
10~12 mm/min；Wherein consutrode is the diameter of phi 160mm using AOD furnace technique productions and through being made；The electricity produced
Slag ingot size is Φ 450mm, and end Ingot Surface Quality is good, nonmetallic the defects of no slag runner, dross, pipe, fold, slag inclusion
Field trash gross 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, add different content（20~30%）'s
Al2O3, surplus CaF2, detection resistance rate and hemispherical fusion temperature, different Al2O3The physical parameter of content slag is shown in Table 1.
As a result show, work as Al2O3For content in 26-28%, resistivity and hemispherical fusion temperature can reach the requirement for producing 17-4PH.
2nd, the screening of CaO content.
On the basis of the content of embodiment 1, fixed Al2O3、SiO2、MgO content, add different content（20~30%）'s
CaO, surplus CaF2, detection resistance rate and hemispherical fusion temperature, the physical parameter of different CaO content slags are shown in Table 2.
As a result show, when CaO content is in 25-27%, resistivity is higher and to melt hemispherical fusion temperature relatively low, can reach and meet smelting
Refine energy-saving requirement during 17-4PH.
3、SiO2The screening process of content.
On the basis of the content of embodiment 1, fixed Al2O3, CaO, MgO content, add different content（2~6%）'s
SiO2, surplus CaF2 , detection resistance rate and hemispherical fusion temperature, different SiO2The physical parameter of slag during content is shown in Table 3.
As a result show, work as SiO2Content has good high-temp plastic and intensity in 4-5%, meets wanting for production 17-4PH
Ask.
Embodiment 2.
Using the pre-melted slag electroslag remelting 0Cr17Ni4Cu4Nb steel smelted in examples detailed above 1（That is 17-4PH）, in Jiangsu
1.5 tons of electroslag furnaces of enterprise are produced.
During 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 during smelting, electric current 6800A-7500A, crystallizer specification
For Ф 330mm, 205mm square rod of the electrode bar for intermediate frequency furnace+refining furnace technology after forged.700kg steel ingots are melted in actual 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 relatively low, with electrode
Material is compared, and the non-metallic inclusion content of ESR ingot reduces about 65%.
Embodiment 3.
After fluorite, quick lime, aluminum oxide, fused magnesite, silica are mixed in proportion, melt and stir, 1500 ~
Melting 43min at 1560 DEG C；Then it is poured into made of steel plate in water cooling slag pan, is cooled to room temperature, is crushed to grain
Spend for 5 ~ 10mm, the special slag system for being used to produce 17-4PH steel ingots of mentioned component content is made.Obtain and be used for stripping formula electroslag
The low stain energy-conservation pre-melted slag of hollow ingot is produced in remelting, is packaged into mono- bag of 20kg, and power supply slag hearth uses.
Above-mentioned special slag system is made up of the composition of following weight percents：Al2O3：27.8%, CaO：26.9%, SiO2：
4.1%, MgO：5.9% configuration, surplus CaF2；The dual alkalinity CaO/SiO of slag2For 6.5.
Electroslag remelting 17-4PH is produced in Anhui enterprise using above-mentioned pre-melted slag, slugging technique starts for melt cinder, i.e. stone
Electrode ink slugging first, then change metal electroslag steel.Technique is during smelting：Voltage：48V~52V；Smelt electric current：
13000-13500A.Melting speed control is in 480kg/h~520kg/h.
Through experiment, 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 inclusions content of ESR ingot reduces about 62%, B class non-metallic inclusions and contained
Amount, which reduces about 57%, C class non-metallic inclusions content, reduces about 65%.
Comparative example 1.
After fluorite, quick lime, aluminum oxide, fused magnesite, silica are mixed in proportion, melt and stir, 1500 ~
Melting 30min at 1550 DEG C；Then it is poured into made of steel plate in water cooling slag pan, is cooled to room temperature, is crushed to grain
Spend for 3 ~ 12mm, traditional solid ingot stripping slag system is made.
Traditional solid ingot is made up of with stripping slag system the composition of following weight percents：Al2O3：20%, CaO：19.8%,
CaF2：59% configuration, surplus SiO2。
After fluorite, quick lime, aluminum oxide, fused magnesite, silica are mixed in proportion, melt and stir, 1480 ~
Melting 35min at 1570 DEG C；Then it is poured into made of steel plate in water cooling slag pan, is cooled to room temperature, is crushed to grain
Spend for 1 ~ 10mm, ANF-6 slag systems are made.
ANF-6 slag systems are made up of the composition of following weight percents：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 in the range of 1300 ~ 1500 DEG C.
As a result show, 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 slags, and curve is shown in figure
3.Using traditional solid ingot stripping slag system (60%CaF2, 20%Al2O3, 20%CaO) and repeat above-mentioned experiment, 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 gross weight content are higher.
Comparative example 2.
After fluorite, quick lime, aluminum oxide, fused magnesite, silica are mixed in proportion, melt and stir, 1500 ~
Melting 43min at 1560 DEG C；Then it is poured into made of steel plate in water cooling slag pan, is cooled to room temperature, is crushed to grain
Spend for 5 ~ 10mm, the special slag system for being used to produce 17-4PH steel ingots of mentioned component content is made.Obtain and be used for stripping formula electroslag
The low stain energy-conservation pre-melted slag of hollow ingot is produced in remelting, is packaged into mono- bag of 20kg, and power supply slag hearth uses.
Above-mentioned special slag system is made up of the composition of following weight percents：Al2O3：27.7%, CaO：30%, SiO2：4.15%,
MgO：5.9% configuration, surplus CaF2；The dual alkalinity CaO/SiO of slag2For 7.2.
Electroslag remelting 17-4PH is produced in Anhui enterprise using above-mentioned pre-melted slag, slugging technique starts for melt cinder, i.e. stone
Electrode ink slugging first, then change metal electroslag steel.Technique is during smelting：Voltage：52V；Smelt electric current：13000A.It is molten
Speed control is in 4.35kg/min.
Through experiment, hydrogen content reaches 4.3ppm in ESR ingot, and the requirement of the hydrogen content of the steel is below 3ppm, is unsatisfactory for matter
Amount requires.
Pass through the contrast of comparative example 2, it can be deduced that when CaO content is higher by 25%~27% that the present invention is limited, can 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, aluminum oxide, fused magnesite, silica are mixed in proportion, melt and stir, 1500 ~
Melting 43min at 1560 DEG C；Then it is poured into made of steel plate in water cooling slag pan, is cooled to room temperature, is crushed to grain
Spend for 5 ~ 10mm, the special slag system for being used to produce 17-4PH steel ingots of mentioned component content is made.Obtain and be used for stripping formula electroslag
The low stain energy-conservation pre-melted slag of hollow ingot is produced in remelting, is packaged into mono- bag of 20kg, and power supply slag hearth uses.
Above-mentioned special slag system is made up of the composition of following weight percents：Al2O3：27.5%, CaO：20%, SiO2：4.12%,
MgO：5.9% configuration, surplus CaF2；The dual alkalinity CaO/SiO of slag2For 4.85.
Electroslag remelting 17-4PH is produced in Anhui enterprise using above-mentioned pre-melted slag, slugging technique starts for melt cinder, i.e. stone
Electrode ink slugging first, then change metal electroslag steel.Technique is during smelting：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 classes non-metallic inclusion reduction by 45% or so, B classes are nonmetallic in steel
Inclusion content, which reduces by 30% or so, C class non-metallic inclusions content, reduces about 35%, and the positive effect of removal of inclusions is less than this
The slag system of invention.
Pass through the contrast of comparative example 3, it can be deduced that when CaO content is less than 25%~27% that the present invention is limited, be unfavorable for
The removal of steel inclusion.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies
Change, equivalent substitution, improvement etc., should be included in the scope of the protection.
Claims (6)
1. a kind of special slag system for being used to produce 17-4PH steel ingots, it is characterised in that the special slag system is by following weight percents
Composition forms：Al2O3：26 ~ 28%, CaO：25 ~ 27%, SiO2：4 ~ 5%, MgO：5 ~ 6%, surplus CaF2, dual alkalinity 5 ~
Between 6.75.
2. a kind of special slag system for being used to produce 17-4PH steel ingots according to claim 1, it is characterised in that its feature exists
In the special slag system fusing hemispherical fusion temperature be 1220 ~ 1250 DEG C.
A kind of 3. special slag system for being used to produce 17-4PH steel ingots according to claim 1, it is characterised in that the Special slag
It is to be used for stripping formula electroslag remelting process production precipitation hardenable martensitic stain less steel 17-4PH steel ingots.
A kind of 4. special slag system for being used to produce 17-4PH steel ingots according to claim 1, it is characterised 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.
A kind of 5. preparation method as claimed in claim 1 for being used to produce the special slag system of 17-4PH steel ingots, it is characterised in that
The party prepares method and comprised the following steps：After fluorite, quick lime, aluminum oxide, fused magnesite, silica are mixed in proportion, fusing is simultaneously
Stir, more than the melting 40min at 1500 ~ 1560 DEG C；
Then it is poured into made of steel plate in water cooling slag pan, is cooled to room temperature, it is 5 ~ 10mm to be crushed to granularity, is made
The special slag system for being used to produce 17-4PH steel ingots of mentioned component content.
A kind of 6. application method as claimed in claim 1 for being used to produce the special slag system of 17-4PH steel ingots, it is characterised in that
The application method comprises the following steps：The slag of slag system of the present invention is baked to 800 DEG C first, and is incubated more than 10h；In electroslag
In reflow process, the Special slag toasted is tied up in slugging stove and is warming up to more than 1600 DEG C and melting down, it is left then to refine 20min
The right side, liquid slag is poured into the crystallizer of electroslag furnace, will be powered, and make certainly after the consutrode of remelting is inserted in crystallizer
Power pole contacts to form power circuit with clinker, carries out electroslag remelting 17-4PH fusion process, is formed after electrode melting molten
Start stripping operation behind pond.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710637068.4A CN107488788B (en) | 2017-07-31 | 2017-07-31 | It is a kind of for producing the dedicated slag system and its preparation and application of 17-4PH steel ingot |
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| CN201710637068.4A CN107488788B (en) | 2017-07-31 | 2017-07-31 | It is a kind of for producing the dedicated slag system and its preparation and application of 17-4PH steel ingot |
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| CN109182775A (en) * | 2018-08-30 | 2019-01-11 | 河南中原特钢装备制造有限公司 | Martensitic precipitation electroslag remelting process |
| 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 |
| 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 |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| EP3950173B1 (en) * | 2019-03-26 | 2023-04-05 | Denka Company Limited | Flux configured to be used in electroslag remelting method, and flux production method |
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| CN107488788B (en) | 2019-02-26 |
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