CN107858525A - A kind of electroslag remelting free-floride slag technical recipe and its method for electroslag remelting - Google Patents
A kind of electroslag remelting free-floride slag technical recipe and its method for electroslag remelting Download PDFInfo
- Publication number
- CN107858525A CN107858525A CN201710350374.XA CN201710350374A CN107858525A CN 107858525 A CN107858525 A CN 107858525A CN 201710350374 A CN201710350374 A CN 201710350374A CN 107858525 A CN107858525 A CN 107858525A
- Authority
- CN
- China
- Prior art keywords
- slag
- electroslag remelting
- floride
- free
- steel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
A kind of method present invention relates particularly to electroslag remelting free-floride slag technical recipe and its for electroslag remelting.The electroslag remelting free-floride slag, include the component of following parts by weight：40~44 parts of CaO, 46~50 parts of Al2O3, 3~5 parts of MgO and 5~10 part of Li2CO3.Using the floride-free slag so matched, the Li of addition2CO3And MgO with substitute a part CaO and Al2O3, make the more stable of slag ingredient in fusion process and technical process；The not only steel ingot shaping that using the floride-free slag obtain after electroslag remelting is more preferable, any surface finish, ingotism degree are smaller, and more environmentally friendly does not have sulfide and globular inclusion.
Description
Technical field
A kind of method present invention relates particularly to electroslag remelting free-floride slag technical recipe and its for electroslag remelting.
Background technology
Electroslag remelting technique is one of effective means for obtaining high-quality steel ingot, and in esr process, steel is in melt cinder
Fully it is purified under conditions of reflection, in being solidified in water mold under the protection of high-temperature slag, and surface of steel ingot has slag crust
Protection, so as to obtain any surface finish, internal axial crystalline structure is flourishing, and non-metallic inclusion is significantly reduced, greatly changed
It has been apt to segregation and rarefaction defect.The technology is at home and abroad widely used at present.
Electroslag remelting process steel-making is to produce the important smelting mode of superior alloy steel and alloy, is selected in esr process
To be an important technology link, it is in addition to the thermal source as consutrode with the remelting slag of matching adaptation
The chemical composition of metal, refining liquid steel can also be controlled, remove non-metallic inclusion.AH Φ -6 are once widely used for a long time both at home and abroad
Slag（CaF270%+Al2O330%）.It is currently used with CaF2For the high fluorine remelting slag of base, slag caloric value higher than conductance be present
Deficiency, slag composition is uncontrollable in reflow process, stability of the electroslag remelting in remelting processing is then have impact on, due to containing big
The CaF of amount2, there is SiF in fusion process4、HF、AlF3Escaped Deng a large amount of volatile fluoro-gas, seriously pollute environment, endangered
Health etc., certain hidden danger be present, do not meet environmental protection and energy saving requirement, also need the related auxiliary environmental protection facility of matching.
Existing floride-free remelting slag, main exploitation have CaO-Al2O3And CaO-Al2O3-SiO2Floride-free slag, according to related
Data and phase diagram theory introduction, stable 12CaO7Al can just be formed2O3Eutectic.2580 DEG C or so of CaO fusing point,
Al2O32050 DEG C or so of fusing point, it is poor fusing point to be present in both, and esr process is entered under conditions of recirculated water cools down by force
It is capable, therefore the high CaO of fusing point is prior to low-melting Al2O3Crystallizer inwall solidify, with melting carry out CaO therewith
Reduce, it is difficult to preferably form stable 12CaO7Al2O3.So use CaO：Al2O3Mass ratio is all approximation 1:1 proportioning
Floride-free slag, slag crust minimal thickness is easily uneven in actual production, has a strong impact on surface of steel ingot finish etc., composition be present and matches somebody with somebody
Than the puzzlement for needing empirically moderately to adjust.
Existing some schemes adopt the following technical scheme that：A kind of electroslag remelting free-floride slag, including following component：CaO-
Al2O3-MgO-SiO2Combination matching, although avoiding the fluoride pollution in esr process, containing, aluminium, titanium elements are high
The electroslag remelting of the materials such as temperature alloy, Precise Alloy, it will be affected to its interior alloying element ratio, so as to not reach expection
Technical standard requirement.
Containing aluminium, titanium high temperature alloy esr process in, due to the activity of aluminium, titanium elements, easily displacement parsing
SiO2In Si elements, broken ingredient balance.And the fusing point of program free-floride slag higher than other slag system species fusing points about 100 ~
200 DEG C, starting the arc relative difficulty, attend to one thing and lose sight of another and lose its advantageous characteristic.
There is scheme to use the graphite electrode starting the arc, to solve the drawbacks of its fusing point is high, in some alloy species, particularly to carbon
The species of the requirements of content ＜ 0.08%, it will be affected.
The content of the invention
For deficiencies of the prior art, the technical problem to be solved in the present invention is：For containing in the prior art
Resolving probiems existing for fluorine slag simultaneously thoroughly replace, it is further provided a kind of pollution that can be reduced to environment, and can ensure electroslag
The molten steel flow of remelting is good, fusing point is greatly lowered, ingot casting shaping is good, any surface finish, ingotism degree are small, dense structure
Uniform and low gas content electroslag remelting free-floride slag and its method for electroslag remelting, and this method is solving existing free-floride
Slag is of problems simultaneously, has expanded application, and is more applied to the esr process under vacuum state.
In order to solve the above-mentioned technical problem, the present invention adopts the following technical scheme that：A kind of electroslag remelting free-floride slag, including such as
The component of lower parts by weight：40~44 parts of CaO, 46~50 parts of Al2O3, 3~5 parts of MgO and 5~10 part of Li2CO3。
Using the floride-free slag so matched, the Li of addition2CO3And MgO with substitute a part CaO and Al2O3, make melting
During slag ingredient and technical process it is more stable；Wherein, Li2CO3The fusing point of slag can be reduced：Li2CO3In heating condition
Under, it is decomposed into LiO2And CO2, CO2Gas evolution, lithium ion are filled between other molecules because its relative volume is small, are destroyed
Intermolecular active force, reduces 30-50 DEG C of its fusing point；And a small amount of MgO forms half solidification film on slag bath surface, slag is reduced
Inhale the possibility that the oxide that appraised at the current rate in hydrogen and slag transmits oxygen to metal bath in pond.Coagulated to make up fusion process under strong cool condition
Admittedly the CaO lost.The steel ingot for using the floride-free slag obtain after electroslag remelting is molded more preferable, any surface finish, ingotism
Degree is smaller.
The electroslag remelting free-floride cinder ladle includes the component of following parts by weight：44 parts of CaO, 46 parts of Al2O3, 4 parts MgO and 6 part
Li2CO3.Using such optimum ratio slag charge, can effectively reduce in ingot casting gas content simultaneously, make extensibility oxide in steel,
Is greatly reduced in sulfide content
The method that electroslag remelting is carried out using the electroslag remelting free-floride slag, is comprised the following steps：
a）Floride-free slag is bakeed 8 ~ 10 hours at 800 ~ 900 DEG C in stove, that is, takes and uses；
b）Consutrode is welded on dummy electrode, assembles electroslag refining furnace, is added into the crystallizer of the electroslag refining furnace
Enter deoxidier and step a）The floride-free slag bakeed, with the metal electrode starting the arc, observe after color becomes bright in crystallizer stove after 8
~ 11 minutes, take out graphite electrode；The deoxidier includes aluminium powder and calcium grain, and the mass ratio of the aluminium powder, calcium grain and floride-free slag is
0.3~0.5:0.3~0.7:100；
c）Step b）After slag making terminates, change graphite electrode into consumable electrode melting, set 62 ~ 65V of voltage, electric current 7000 ~
8000A,（Remarks：When selecting the numerical value of voltage, electric current, will be set according to different product species, tonnage, not as only
One standard value）Energization seasoning metal, aluminium powder is added in reflow process and carries out deoxidation, wherein, the addition of aluminium powder is the consumable
The 0.05 ~ 0.1% of electrode weight.
Continue step b）It is middle to use the metal electrode starting the arc, after crystallizer in-furnace temperature reaches desired temperature, take out metal electrode.
It so more can guarantee that floride-free slag fusing is complete, it is ensured that higher slag bath temperature, and then make to purify during consumable electrode melting
It is more efficient.
The material of consutrode is structural alloy steel, alloy tool steel, alloy die steel or austenitic stainless steel, is particularly
Structural alloy steel, alloy tool steel, alloy die steel or austenitic stainless steel contain the alloy steel grade of aluminium or titanium.The present invention uses
The method that floride-free slag carries out electroslag remelting generates rather high-quality effect to austenite steel grade, makes this two classes steel grade ingot casting shaping
Effect is good, any surface finish, and desulfuration effect is good, and the extensibility sulfide and oxide in steel reduce notable.
Compared with prior art, the present invention has following advantage：
1st, fluoride-free slag of the present invention is meeting existing floride-free slag formula advantage simultaneously by the collaboration compatibility effect of each component, than
Such as：The surface of steel ingot that can obtain remelting is bright and clean, ingotism degree is small, even tissue is fine and close, gas content is low in steel, gram
The problem of having taken The ingot casting thickness that prior art free-floride slag obtains uneven finish difference.Preferably provide the contrast of steel ingot structure
Figure finds out above-mentioned advantage to contrast, meanwhile, possess larger range of steel grade applicability, structural alloy steel, alloy tool steel, conjunction
Golden mould steel, particularly austenitic stainless steel, the alloy steel grade containing aluminium or titanium.
2nd, the floride-free slag of the present invention is compared with the fluorine-containing slag system of prior art, and will not being volatilized in esr process, it is poisonous to produce
Fluoride, and then do not pollute the environment and be detrimental to health, more with green environmental protection.
3rd, existing conventional electroslag remelting equipment, applicability can be used by carrying out electroslag remelting using the floride-free slag of the present invention
By force, particularly in vacuum electroslag smelting, its unique preparation advantage is more highlighted.
Embodiment
The present invention is described in further detail with reference to specific embodiment.But protection scope of the present invention be not limited to
Under embodiment.
1st, the application of example 1 slag system smelts H13 ESR ingot examples
A kind of electroslag remelting free-floride slag, include the component of following parts by weight：44 parts of CaO, 46 parts of Al2O3, 4 parts MgO and 6 part
Li2CO3H13 ESR ingots are produced using above-mentioned electroslag remelting free-floride slag remelting, for 3 tons of ingot shape ESR ingots of electroslag remelting.Experiment altogether
Three stoves, specifically with the following method：
a）Raw material is weighed, in 800 DEG C of afterheat baking 7-8 hours, fully removes the moisture in slag charge.
b）Crystallizer average diameter：Φ580mm
c）Consutrode diameter：Φ 420mm, consutrode base are welded on dummy electrode；
d）Use the quantity of slag：100Kg
e）Smelt voltage：72~75V
f）Smelt electric current：11000~13000A
g）Melting result, ESR ingot any surface finish, every detection performance meets GB/T1299 after forging《Alloy tool
Steel》Technical requirements.
h）Using reduction current system feeding step by step.After feeding terminates power-off, 50-60 minutes are cooled down in crystallizer, are taken off
Mould is sent into plus stay-warm case, obtains H13 alloy steel ingots.
i）The contrast subordinate list 1 and subordinate list 3 of chemical composition before and after H13 steel electroslag remeltings
2nd, (operating process leads to example 1 to the application of embodiment 2 slag system smelting GH4169 high temperature alloy ESR ingots example, no longer tired
State）
A) is used for 1 ton of ingot shape ESR ingot of electroslag remelting.Three stoves are tested altogether
B) crystallizers average diameter：Φ360mm
C) consutrodes diameter：Φ220mm
D) uses the quantity of slag：40Kg
E) smelts voltage：62~65V
F) smelts electric current：7000~8000A
G) meltings result, ESR ingot any surface finish, every detection performance meets customer specification after forging.
H) contrast of chemical composition sees attached list 2 and subordinate list 3 before and after .GH4169 electroslag remeltings
From subordinate list 1, the every contrast of subordinate list 2：The steel ingot obtained after remelting is more equal than the content of the nitrogen of consutrode base, hydrogen, oxygen
There is reduction；Extensibility oxide, the content of sulfide are also greatly reduced in steel.In addition, obtained using the floride-free slag of the present invention
H13, GH4169 mainly state has the advantages of assorted petty sample than documents, overcomes those defects in documents.
This slag system is due to adding Li2CO3,The fusing point of bits is effectively reduced, its mobility is fine, for smelting picture
High temperature alloy and austenitic stainless steel a kind of GH4169 has an obvious advantage, after electroslag remelting, ESR ingot any surface finish, and no slag
Ditch and fold, almost it is adapted to the smelting of all steel grades and alloy.Because this slag system fusing point is low, good fluidity, using this slag
The slag crust of electroslag ingot surface is thinner when system smelts, and under crystallizer identical cooling condition, the chill of ESR ingot substantially thickens,
Interior tissue is finer and close, and crystal grain is thinner.The grain size of forging is detected after forging can reach more than 8 grades, and carbide
Grain distribution fine uniform, side knock work(substantially increase and the present invention slag system it is non-volatile go out corrosive fluorine gas, will not be right
Equipment produces corrosion, it can be seen that no sulfide and globular inclusion to table table 3, therefore electroslag remelting free-floride slag and its
Method for electroslag remelting is more environmentally friendly.
The contrast of chemical composition before and after the H13 steel electroslag remeltings of subordinate list 1
The contrast of chemical composition before and after the GH4169 electroslag remeltings of subordinate list 2
The testing result of steel ingot before and after the electroslag remelting of subordinate list 3
Explanation：A classes：Sulfide B classes：Silicates C classes：Aluminate class D classes：It is indeformable spherical to be mingled with
" 0 " is represented currently without discovery content；Other numerical basis GB spectral contrasts draw data.
Claims (8)
1. a kind of electroslag remelting free-floride slag, it is characterised in that include the component of following parts by weight：40~44 parts of CaO, 46~50 parts
Al2O3, 3~5 parts of MgO and 5~10 part of Li2CO3。
2. electroslag remelting free-floride slag according to claim 1, it is characterised in that include the component of following parts by weight：44 parts
CaO, 46 parts of Al2O3, 4 parts of MgO and 6 part of Li2CO3。
3. the method that electroslag remelting is carried out using the electroslag remelting free-floride slag of claim 1 or 2, it is characterised in that including such as
Lower step：
1）The electroslag remelting free-floride slag of claim 1 or 2 is bakeed 8 ~ 10 hours at 800 ~ 900 DEG C in stove；
2）Consutrode is welded on dummy electrode, assembles electroslag refining furnace, is added into the crystallizer of the electroslag refining furnace
Enter deoxidier and step 1）The floride-free slag bakeed, with the graphite electrode starting the arc, observe after color becomes bright in crystallizer stove after 7
~ 12 minutes, take out graphite electrode；The deoxidier includes aluminium powder and calcium grain, and the mass ratio of the aluminium powder, calcium grain and floride-free slag is about
For 0.25 ~ 0.5:0.33~0.65:100, micro adjustment can be carried out according to different steel grades, it is best in quality to adapt to its；
3）Step 2）After slag making terminates, change graphite electrode into consumable electrode melting, set 52 ~ 54V of voltage, electric current 7500 ~
8100A, energization seasoning metal, aluminium powder is added in reflow process and carries out deoxidation, wherein, the addition of aluminium powder is the consutrode
The 0.06 ~ 0.10% of weight.
4. the method that electroslag remelting free-floride slag carries out electroslag remelting according to claim 3, it is characterised in that step 2）Middle gas
In the selection of arc electrode, ordinary steel selection graphite electrode, high temperature alloy, low-carbon alloy select metal electrode.
5. the method that electroslag remelting free-floride slag carries out electroslag remelting according to claim 3, it is characterised in that step 2）Middle use
The graphite electrode starting the arc, 9-12 minutes again after color becomes bright in crystallizer stove, take out graphite electrode.
6. the method that electroslag remelting free-floride slag carries out electroslag remelting according to claim 3, it is characterised in that step 3）In set
Put voltage 52V, electric current 7800A energization seasoning metals.
7. the method that electroslag remelting free-floride slag carries out electroslag remelting according to claim 3, it is characterised in that described from power consumption
The material of pole is austenitic stainless steel, structural alloy steel, alloy tool steel or alloy die steel.
8. the method that electroslag remelting free-floride slag carries out electroslag remelting according to claim 7, it is characterised in that described from power consumption
The material of pole is the steel grade containing aluminium or titanium in austenitic stainless steel, structural alloy steel, alloy tool steel or alloy die steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710350374.XA CN107858525B (en) | 2017-05-18 | 2017-05-18 | Electroslag remelting fluorine-free slag process formula and method for electroslag remelting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710350374.XA CN107858525B (en) | 2017-05-18 | 2017-05-18 | Electroslag remelting fluorine-free slag process formula and method for electroslag remelting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107858525A true CN107858525A (en) | 2018-03-30 |
| CN107858525B CN107858525B (en) | 2020-06-12 |
Family
ID=61699062
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710350374.XA Active CN107858525B (en) | 2017-05-18 | 2017-05-18 | Electroslag remelting fluorine-free slag process formula and method for electroslag remelting |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107858525B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60190506A (en) * | 1984-03-09 | 1985-09-28 | Hitachi Ltd | Production of ferrous and non-ferrous super alloy |
| JPS61195934A (en) * | 1985-02-25 | 1986-08-30 | Kobe Steel Ltd | Flux for electro-slag remelting |
| CN103667732A (en) * | 2012-09-12 | 2014-03-26 | 上海丰渠特种合金有限公司 | Fluoride-free slag, application thereof, electroslag remelting method and obtained nickel alloy |
| CN104588601A (en) * | 2015-02-14 | 2015-05-06 | 河南通宇冶材集团有限公司 | High-speed wide and thick slab continuous casting mold flux |
| CN105779780A (en) * | 2016-05-30 | 2016-07-20 | 重庆钢铁(集团)有限责任公司 | Electroslag remelting fluoride-free slag and electroslag remelting method thereof |
| CN106270429A (en) * | 2015-06-09 | 2017-01-04 | 宝山钢铁股份有限公司 | Hypoergia covering slag and preparation method |
-
2017
- 2017-05-18 CN CN201710350374.XA patent/CN107858525B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60190506A (en) * | 1984-03-09 | 1985-09-28 | Hitachi Ltd | Production of ferrous and non-ferrous super alloy |
| JPS61195934A (en) * | 1985-02-25 | 1986-08-30 | Kobe Steel Ltd | Flux for electro-slag remelting |
| CN103667732A (en) * | 2012-09-12 | 2014-03-26 | 上海丰渠特种合金有限公司 | Fluoride-free slag, application thereof, electroslag remelting method and obtained nickel alloy |
| CN104588601A (en) * | 2015-02-14 | 2015-05-06 | 河南通宇冶材集团有限公司 | High-speed wide and thick slab continuous casting mold flux |
| CN106270429A (en) * | 2015-06-09 | 2017-01-04 | 宝山钢铁股份有限公司 | Hypoergia covering slag and preparation method |
| CN105779780A (en) * | 2016-05-30 | 2016-07-20 | 重庆钢铁(集团)有限责任公司 | Electroslag remelting fluoride-free slag and electroslag remelting method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107858525B (en) | 2020-06-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110004312B (en) | Triple smelting process of nickel-based high-temperature alloy GH4698 large-size cast ingot | |
| CN108546834B (en) | Purification smelting method for nickel-based high-temperature alloy master alloy | |
| CN111378848B (en) | Pre-melted slag for electroslag remelting for improving purity of GH4169 alloy return and preparation method thereof | |
| CN102021488B (en) | Steel for nuclear-island seamless steel tube and production method thereof | |
| CN109161697B (en) | Method for controlling non-metallic inclusions in powder metallurgy high-temperature alloy master alloy | |
| CN103725895B (en) | Containing pre-melt of aluminium titaniferous high alloy steel round blank remelting electroslag and preparation method thereof | |
| CN104152710B (en) | The smelting process of esr refining slag and application thereof | |
| CN105734302B (en) | GH4169 steel alloy electroslag remelting refining slags and its method for carrying out electroslag remelting to GH4169 steel alloys | |
| CN109161696B (en) | Electroslag remelting slag system and low-oxygen control method for electroslag remelting Fe-Cr-Al alloy | |
| CN101709393A (en) | Method for preparing contact material having high performance and low mixed copper-chromium alloy content | |
| CN113416851B (en) | Preparation method of lanthanum-containing high-temperature alloy | |
| CN104120262A (en) | Method for preparing CuCr alloy ingot through aluminothermic reduction-slag refining | |
| CN110144468A (en) | A kind of electroslag furnace control oxygen slag system and preparation method thereof | |
| CN103526038B (en) | A kind of high-strength high-plasticity TWIP steel esr production method | |
| CN105779780B (en) | A kind of electroslag remelting free-floride slag and its method for electroslag remelting | |
| CN107488788B (en) | It is a kind of for producing the dedicated slag system and its preparation and application of 17-4PH steel ingot | |
| CN108531815A (en) | High temperature bolt steel BG25Cr2MoVA and preparation method thereof | |
| CN105039732B (en) | The electroslag remelting preparation method of low silicon pre-melted slag | |
| CN106636744A (en) | WSTi64E high-damage-tolerance super-large-size titanium alloy cast ingot and preparation method thereof | |
| CN112410573B (en) | Slag system for smelting Ce-containing Fe-Ni soft magnetic alloy and use method thereof | |
| CN107365918A (en) | A kind of casting technique of aluminium alloy ingots | |
| CN104195348A (en) | Low-silicon and low-impurity pre-melting slag for electro-slag remelting and preparing method and application thereof | |
| CN107287462A (en) | A kind of alloy refining alterant and its preparation method and application | |
| CN111139364A (en) | Manufacturing method of over 40 tons of 9Ni large steel ingots | |
| CN1414118A (en) | Production method of small square billet continuous casting bearing steel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |