CN107841588A - A kind of the sial lanthanum nucleating agent and its preparation technology of anti-iron casting shrinkage porosite - Google Patents
A kind of the sial lanthanum nucleating agent and its preparation technology of anti-iron casting shrinkage porosite Download PDFInfo
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- CN107841588A CN107841588A CN201711329894.9A CN201711329894A CN107841588A CN 107841588 A CN107841588 A CN 107841588A CN 201711329894 A CN201711329894 A CN 201711329894A CN 107841588 A CN107841588 A CN 107841588A
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- sial
- lanthanum
- nucleating agent
- inovulant
- shrinkage porosite
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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
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/10—Making spheroidal graphite cast-iron
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- Organic Chemistry (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention discloses a kind of sial lanthanum nucleating agent of anti-iron casting shrinkage porosite, the percent mass proportioning of sial lanthanum nucleating agent various composition is：Si：70‑75%；Al：3.2‑4.5%；La：2.0‑2.4%；Ca：0.8‑1.5%；Surplus Fe, the present invention can be to the complicated high-performance thin-walled smallclothes of planform and some positions due to limiting in geometric position and technique, the problems such as rising head or excessive feeding distance can not be set, is effectively solved, sial lanthanum nucleating agent can avoid iron casting from producing shrinkage porosite problem, improve product quality, use range is wide, and limitation is small, while reduces cost.
Description
Technical field
The present invention relates to a kind of inovulant preparation technology, specifically it is a kind of prevent iron casting shrinkage porosite sial lanthanum it is pregnant
Educate agent and its preparation technology.
Background technology
Shrinkage porosite is a kind of distinctive defect of iron casting, more more universal than in common gray iron, also known as Micro shrinkage.Contracting
The macrofracture pattern of pine in spongy, by means of microscope it is observed that naked eyes be not easy it is differentiating, tiny, scattered
Hole.Shrinkage porosite has a strong impact on iron casting performance, increases iron casting percent defective.
The shrinkage cavity of iron casting and shrinkage defect be always make founder author very headache the problem of, and with industrial skill
The development of art, now user to casting compactness and flawless require more and more higher.It is not only right by taking automobile iron casting as an example
Chemical composition, material property, the surface quality of casting have strict requirements, and the requirement to cast-internal consistency is also very tight
Lattice.Such as does body dissection to the requirement of spherulitic iron crankshaft interior solid degree and x-ray is detected a flaw, and 100% is carried out to the surface after processing
Magnetic powder inspection；And for example, the safety member such as caliper will carry out the dissection piecewise of vertical and horizontal before accreditation, then carry out x-ray
Flaw detection, is not allow for shrinkage cavity and shrinkage defect.However, these G. Iron Castings are due to material, technique and casting structure etc.
Reason, it is relatively difficult to reach these requirements.
Iron casting, which produces the reason for shrinkage porosite, to be had a variety of, and the method for reply also has a lot.It is well known that prevent and eliminate ball
The shrinkage cavity shrinkage porosity of iron castings.Mainly there is following approach.(1) structure design of casting is improved, considers the manufacturability of casting as far as possible,
The thermal center on geometry is reduced as far as possible.(2) carry out rational casting Technology Design, calculate and set rational running gate system and
Feeding head.(3) improve the rigidity of casting mold or select rigid casting mold.(4) cooling velocity of casting is improved, to the solidification side of casting
Formula has a major impact.(5) fastening of shell mould back side filling shot, Iron Mould Coated Sand technique, metal mold technique are both to speed up cooling velocity
It is to improve mold stiffness to varying degrees to solve the effective way of shrinkage porosity defect of contraction cavity again.(6) adjust and control G. Iron Castings
Chemical composition, such as improve carbon equivalent, control residual magnesium content and residual rare earth, improve fusion process, improve iron liquid metallurgy matter
Amount etc. is also to eliminate the important supplementary means of shrinkage porosity defect of contraction cavity.Lacked although there is above approach to solve the loss of the volume of G. Iron Castings
Fall into, but in the production of actual iron casting, prior art still can not meet process requirements.Such as automobile G. Iron Castings, it is substantially
The complicated high-performance thin-walled smallclothes of low module, planform, shrinkage cavity shrinkage porosity tendency itself are big；And due to of large quantities, it is suitable for
Produced using high speed wet type mo(u)lding line, mold stiffness is relatively low；Limited to due to geometric position and technique at some positions, it is impossible to set rising head
Or feeding distance is excessive；The method that lower chill improves cooling rate is also difficult to use on high-speed molding line；Therefore shrinkage porosite problem is often
It is difficult to be solved.
The content of the invention
The inventive method technical problem to be solved is, the shortcomings that for above prior art, proposes a kind of anti-magnesium iron
The preparation technology of the sial lanthanum nucleating agent of Shrinkage Porosity, the present invention are achieved in the following ways：
Step 1: dispensing：
1. the furnace charge amount loaded to Medium frequency induction electric melting furnace is 600-800 kg；
2. then weighed using standard test weight demarcation calibration before dispensing；
3. preparing the various elements content ratio in inovulant needed for, corresponding raw material usage amount is calculated, is made
Charger sheet, various raw material and stand-by are then accurately weighed according to charger sheet；
Step 2: charging：
The order of melting sial lanthanum nucleating agent is：First in the low addition 100-150kg ferrosilicon of stove, then again by charger sheet ormal weight
Industrial steel scrap, then add aluminium ingot block, lanthanoid metal block, then add remaining ferrosilicon and silico-calcium, wherein it is 75 that the ferrosilicon added, which is the trade mark,
Ferrosilicon or silicone content be 75% ferrosilicon；
Step 3: melting：
1. after completing step 2, you can heating, it is 300-560V, electric current 450- to control Medium frequency induction electric melting furnace voltage
750A, in-furnace temperature is risen to 1320-1350 DEG C within 45-60 minutes, then starts melting；
2. when furnace charge all melts, you can manually stirred, it is determined that after without raw material, you can come out of the stove；
Step 4：Inovulant is come out of the stove ingot casting：
Power is down to 0 first, turndown after standing 5-10 minutes, molten iron is slowly poured into inovulant mould；
Step 5: inovulant depanning：
The depanning after inovulant is cooled to room temperature, inovulant is hung to inovulant with driving and stacks place, it is neat to stack；
It is Step 6: broken：
Granularity is crushed on request.
The technical program also discloses the sial lanthanum nucleating agent of anti-iron casting shrinkage porosite, sial lanthanum nucleating agent various composition
Percent mass proportioning is：Si：70-75%；Al：3.2-4.5%；La：2.0-2.4%；Ca：0.8-1.5%；Surplus Fe.
The technical scheme that further limits of the present invention is：
The sial lanthanum nucleating agent of foregoing anti-iron casting shrinkage porosite, the percent mass proportioning of the sial lanthanum nucleating agent various composition
For：Si：73%；Al：3.5%；La：2.3%；Ca：0.9%；Surplus Fe.
The sial lanthanum nucleating agent of foregoing anti-iron casting shrinkage porosite, the quality percentage of the sial lanthanum nucleating agent various composition
Match and be：Si：70%；Al：3.2%；La：2.0%；Ca：0.8%；Surplus Fe.
The sial lanthanum nucleating agent of foregoing anti-iron casting shrinkage porosite, the quality percentage of the sial lanthanum nucleating agent various composition
Match and be：Si：75%；Al：4.5%；La：2.4%；Ca：1.5%；Surplus Fe.
The sial lanthanum nucleating agent of foregoing anti-iron casting shrinkage porosite, the quality percentage of the sial lanthanum nucleating agent various composition
Match and be：Si：72%；Al：3.8%；La：2.2%；Ca：1.2%；Surplus Fe.
The beneficial effects of the invention are as follows：
This sial lanthanum nucleating agent has the essential characteristic of inovulant, when carrying out inoculation to spheroidal graphite cast-iron, by increasing capacitance it is possible to increase graphite
Core and then increase the number of graphite, refine graphite nodule, improve graphite nodule roundness, prevent decaying spheroidisation, reduce chilling tendency,
Prevent free cementite and reduction crystal boundary crisp.Most important of which is exactly to increase the graphite nuclei in magnesium iron process of setting
The quantity of the heart, and then increase Eutectic Cell Number to improve the mechanical property of magnesium iron.
Due to distributing rationally for its alloying element constituent element, effectively it can prevent and reduce iron casting and produce shrinkage defect.
For taking various casting technique means, still there is the user of shrinkage cavity shrinkage porosity in iron casting, undoubtedly adds a kind of beneficial
Selection.The reduction of addition also makes the integrated cost of user decrease.
The industry supply of material style of this sial lanthanum nucleating agent is 2 kinds：A kind of is the particle for current-following inoculation, conventional grain of supplying
Spend and be：0.1-0.5mm, 0.2-0.7mm, 0.7-3mm, 2-6mm；Another kind is the casting bred for mould cavity inoculation or pouring basin
The inoculant block of shaping, profile are the compound round estrade of multiple round estrades composition, and conventional block weight of supplying is：60 grams ± 10 grams, 80 grams
± 10 grams, 90 grams ± 10 grams, mode of supplly is various, meets the needs of different clients, increases use range；
In-mold inoculation inoculant block be most economize on resources, the processing mode that pregnant effect is best, its profile of casting inoculant block is by more
Individual round platform assembly combines, and facilitates inoculant block to depart from casting die, is adapted to be placed on the casting runner of mould cavity inoculation or casts
In model cavity.It is high with intensity, it is easily portable and stores；Consistency height is not easy to float；The advantages that easy to use.
There is element silicon simultaneously, silicon is to promote graphite element, promotes carbon atom to be accumulated to graphite nodule in sial lanthanum nucleating agent
It is poly-.Increase silicon amount can refine graphite nodule, it is evenly distributed and improve roundness, can reduce casting shrinkage cavity and porosity tendency.
Chilling tendency is reduced, increases ferritic content, improves the plasticity of magnesium iron, improves pregnant effect；
With aluminium element, aluminium plays the role of to increase graphite nuclei, can reduce solubility of the carbon in molten iron, and can increase carbon
Activity so that the graphite water capacity easily separates out, and improves process of setting graphitizability, while can also reduce chilling tendency, to adjusting base
Ferrite content has positive role to make the reduction of inovulant fusion temperature after adding aluminium in body, suitable for mould cavity inoculation；
With lanthanum element, when iron liquid solidifies, oxide, sulfide, oxysulfide and the intermetallic compound of lanthanum generation are formed
The substrate of a large amount of graphite crystallizations, has extremely strong nucleation ability.Increase number of graphite ball that can be at double, sphere diameter is small, and distribution is more equal
It is even, ferrite content is significantly increased, hence it is evident that reduce chilling tendency, effectively eliminate casting heat energy-saving position shrinkage porosite；Contain the pregnant of lanthanoid metal
The added material that agent is often used as eliminating shrinkage porosite is educated, the nodulizer inovulant containing lanthanum is for preventing iron casting final set
Region, which produces intergranular shrinkage porosite, obvious action；
With calcium constituent, calcium does not only have graphitizing, and chemical property is very active, is easily closed with oxygen, sulphur, nitrogen, carbon and hydrogenation,
A large amount of reaction heat are released, reduce the cooling velocity of molten iron.The molten iron handled with calcic inovulant, inoculation fade are slow.Calcium pair
Molten iron has good catharsis.
It was reported that inoculation(effect) very little of the ferrosilicon to gray cast iron without aluminium, calcium, even without effect.It is generally acknowledged that：
In iron liquid, aluminium and calcium can react with oxygen, nitrogen, form dystectic compound, turn into the core of graphite crystallization；
With ferro element, using the clean bar shaped steel scrap of derusting, oil removing, for adjusting the carbon equivalent of molten iron.
And in disclosed preparation technology：100-150kg ferrosilicon first is added in furnace bottom, then again by charger sheet ormal weight
Industrial steel scrap, then add aluminium ingot block, lanthanoid metal block, using specific charging sequence, by the low and oxidizable aluminium of fusing point and lanthanum block
Furnace charge lower floor is added in, can so avoid hearth wall from directly being contacted with aluminium, lanthanum block, avoids hearth wall scaling loss aluminium ingot block, lanthanum block, is dropped
Low cost；The ferrosilicon that the ferrosilicon wherein added is the ferrosilicon that the trade mark is 75 or silicone content is 75%, it can so be advantageous to improve silicon
The purity of aluminium lanthanum nucleating agent, reduce unnecessary impurity.
Embodiment
The present invention is described in further detail below；
Embodiment 1
A kind of sial lanthanum nucleating agent for anti-iron casting shrinkage porosite that the present embodiment provides, the sial lanthanum nucleating agent various composition
Percent mass proportioning is：Si：73%；Al：3.5%；La：2.3%；Ca：0.9%；Surplus Fe；
The present embodiment additionally provides the preparation technology of the sial lanthanum nucleating agent of anti-iron casting shrinkage porosite, and the preparation technology presses following step
It is rapid to carry out：
Step 1: dispensing：
1. the furnace charge amount loaded to Medium frequency induction electric melting furnace is 600 kg；
2. then weighed using standard test weight demarcation calibration before dispensing；
3. preparing the various elements content ratio in inovulant needed for, corresponding raw material usage amount is calculated, is made
Charger sheet, various raw material and stand-by are then accurately weighed according to charger sheet；
Step 2: charging：
The order of melting sial lanthanum nucleating agent is：First in the low addition 100kg ferrosilicon of stove, then again by the industry of charger sheet ormal weight
Steel scrap, then add aluminium ingot block, lanthanoid metal block, then add remaining ferrosilicon and silico-calcium, wherein the silicon that it is 75 that the ferrosilicon added, which is the trade mark,
Iron；
Step 3: melting：
1. after completing step 2, you can heating, it is 300V, electric current 450A to control Medium frequency induction electric melting furnace voltage, at 45 points
In-furnace temperature is risen to 1320 DEG C within clock, then starts melting；
2. when furnace charge all melts, you can manually stirred, it is determined that after without raw material, you can come out of the stove；
Step 4：Inovulant is come out of the stove ingot casting：
Power is down to 0 first, turndown after standing 5 minutes, molten iron is slowly poured into inovulant mould；
Step 5: inovulant depanning：
The depanning after inovulant is cooled to room temperature, inovulant is hung to inovulant with driving and stacks place, it is neat to stack；
It is Step 6: broken：
Granularity is crushed on request, and sial lanthanum nucleating agent granularity is：0.1-0.5mm.
Embodiment 2
A kind of sial lanthanum nucleating agent for anti-iron casting shrinkage porosite that the present embodiment provides, the sial lanthanum nucleating agent various composition
Percent mass proportioning is：Si：70%；Al：3.2%；La：2.0%；Ca：0.8%；Surplus Fe；
The present embodiment additionally provides the preparation technology of the sial lanthanum nucleating agent of anti-iron casting shrinkage porosite, and the preparation technology presses following step
It is rapid to carry out：
Step 1: dispensing：
1. the furnace charge amount loaded to Medium frequency induction electric melting furnace is 800 kg；
2. then weighed using standard test weight demarcation calibration before dispensing；
3. preparing the various elements content ratio in inovulant needed for, corresponding raw material usage amount is calculated, is made
Charger sheet, various raw material and stand-by are then accurately weighed according to charger sheet；
Step 2: charging：
The order of melting sial lanthanum nucleating agent is：First in the low addition 150kg ferrosilicon of stove, then again by the industry of charger sheet ormal weight
Steel scrap, then add aluminium ingot block, lanthanoid metal block, then add remaining ferrosilicon and silico-calcium, wherein it is 75% that the ferrosilicon added, which is silicone content,
Ferrosilicon；
Step 3: melting：
1. after completing step 2, you can heating, it is 560V, electric current 750A to control Medium frequency induction electric melting furnace voltage, at 60 points
In-furnace temperature is risen to 1350 DEG C within clock, then starts melting；
2. when furnace charge all melts, you can manually stirred, it is determined that after without raw material, you can come out of the stove；
Step 4：Inovulant is come out of the stove ingot casting：
Power is down to 0 first, turndown after standing 10 minutes, molten iron is slowly poured into inovulant mould；
Step 5: inovulant depanning：
The depanning after inovulant is cooled to room temperature, inovulant is hung to inovulant with driving and stacks place, it is neat to stack；
It is Step 6: broken：
Granularity is crushed on request, and sial lanthanum nucleating agent granularity is： 0.2-0.7mm.
Embodiment 3
A kind of sial lanthanum nucleating agent for anti-iron casting shrinkage porosite that the present embodiment provides, the sial lanthanum nucleating agent various composition
Percent mass proportioning is：Si：75%；Al：4.5%；La：2.4%；Ca：1.5%；Surplus Fe；
The present embodiment additionally provides the preparation technology of the sial lanthanum nucleating agent of anti-iron casting shrinkage porosite, and the preparation technology presses following step
It is rapid to carry out：
Step 1: dispensing：
1. the furnace charge amount loaded to Medium frequency induction electric melting furnace is 700 kg；
2. then weighed using standard test weight demarcation calibration before dispensing；
3. preparing the various elements content ratio in inovulant needed for, corresponding raw material usage amount is calculated, is made
Charger sheet, various raw material and stand-by are then accurately weighed according to charger sheet；
Step 2: charging：
The order of melting sial lanthanum nucleating agent is：First in the low addition 120g ferrosilicon of stove, then again by the industry of charger sheet ormal weight
Steel scrap, then add aluminium ingot block, lanthanoid metal block, then add remaining ferrosilicon and silico-calcium, wherein the silicon that it is 75 that the ferrosilicon added, which is the trade mark,
Iron；
Step 3: melting：
1. after completing step 2, you can heating, it is 350V, electric current 550A to control Medium frequency induction electric melting furnace voltage, at 50 points
In-furnace temperature is risen to 1330 DEG C within clock, then starts melting；
2. when furnace charge all melts, you can manually stirred, it is determined that after without raw material, you can come out of the stove；
Step 4：Inovulant is come out of the stove ingot casting：
Power is down to 0 first, turndown after standing 8 minutes, molten iron is slowly poured into inovulant mould；
Step 5: inovulant depanning：
The depanning after inovulant is cooled to room temperature, inovulant is hung to inovulant with driving and stacks place, it is neat to stack；
It is Step 6: broken：
Granularity is crushed on request, and sial lanthanum nucleating agent granularity is：2-6mm.
Embodiment 4
A kind of sial lanthanum nucleating agent for anti-iron casting shrinkage porosite that the present embodiment provides, the sial lanthanum nucleating agent various composition
Percent mass proportioning is：Si：72%；Al：3.8%；La：2.2%；Ca：1.2%；Surplus Fe；
The present embodiment additionally provides the preparation technology of the sial lanthanum nucleating agent of anti-iron casting shrinkage porosite, and the preparation technology presses following step
It is rapid to carry out：
Step 1: dispensing：
1. the furnace charge amount loaded to Medium frequency induction electric melting furnace is 650kg；
2. then weighed using standard test weight demarcation calibration before dispensing；
3. preparing the various elements content ratio in inovulant needed for, corresponding raw material usage amount is calculated, is made
Charger sheet, various raw material and stand-by are then accurately weighed according to charger sheet；
Step 2: charging：
The order of melting sial lanthanum nucleating agent is：First in the low addition 130kg ferrosilicon of stove, then again by the industry of charger sheet ormal weight
Steel scrap, then add aluminium ingot block, lanthanoid metal block, then add remaining ferrosilicon and silico-calcium, wherein the silicon that it is 75 that the ferrosilicon added, which is the trade mark,
Iron；
Step 3: melting：
1. after completing step 2, you can heating, it is 430V, electric current 700A to control Medium frequency induction electric melting furnace voltage, at 50 points
In-furnace temperature is risen to 1340 DEG C within clock, then starts melting；
2. when furnace charge all melts, you can manually stirred, it is determined that after without raw material, you can come out of the stove；
Step 4：Inovulant is come out of the stove ingot casting：
Power is down to 0 first, turndown after standing 8 minutes, molten iron is slowly poured into inovulant mould；
Step 5: inovulant depanning：
The depanning after inovulant is cooled to room temperature, inovulant is hung to inovulant with driving and stacks place, wherein neat stacking, silicon
Aluminium lanthanum nucleating agent block weight is：60 grams ± 10 grams.
Embodiment 5
A kind of sial lanthanum nucleating agent for anti-iron casting shrinkage porosite that the present embodiment provides, the quality of sial lanthanum nucleating agent various composition
Per distribution ratio is：Si：72.5%；Al：3.6%；La：2.1%；Ca：0.85%；Surplus Fe；
The present embodiment additionally provides the preparation technology of the sial lanthanum nucleating agent of anti-iron casting shrinkage porosite, and the preparation technology presses following step
It is rapid to carry out：
Step 1: dispensing：
1. the furnace charge amount loaded to Medium frequency induction electric melting furnace is 630 kg；
2. then weighed using standard test weight demarcation calibration before dispensing；
3. preparing the various elements content ratio in inovulant needed for, corresponding raw material usage amount is calculated, is made
Charger sheet, various raw material and stand-by are then accurately weighed according to charger sheet；
Step 2: charging：
The order of melting sial lanthanum nucleating agent is：First in the low addition 140kg ferrosilicon of stove, then again by the industry of charger sheet ormal weight
Steel scrap, then add aluminium ingot block, lanthanoid metal block, then add remaining ferrosilicon and silico-calcium, wherein the silicon that it is 75 that the ferrosilicon added, which is the trade mark,
Iron；
Step 3: melting：
1. after completing step 2, you can heating, it is 450V, electric current 480A to control Medium frequency induction electric melting furnace voltage, at 55 points
In-furnace temperature is risen to 1340 DEG C within clock, then starts melting；
2. when furnace charge all melts, you can manually stirred, it is determined that after without raw material, you can come out of the stove；
Step 4：Inovulant is come out of the stove ingot casting：
Power is down to 0 first, turndown after standing 6 minutes, molten iron is slowly poured into inovulant mould；
Step 5: inovulant depanning：
The depanning after inovulant is cooled to room temperature, inovulant is hung to inovulant with driving and stacks place, it is neat to stack；Wherein silicon
Aluminium lanthanum nucleating agent block weight is：80 grams ± 10 grams.
Embodiment 6
A kind of sial lanthanum nucleating agent for anti-iron casting shrinkage porosite that the present embodiment provides, the quality of sial lanthanum nucleating agent various composition
Per distribution ratio is：Si：74%；Al：3.7%；La：2.2%；Ca：1.3%；Surplus Fe；
The present embodiment additionally provides the preparation technology of the sial lanthanum nucleating agent of anti-iron casting shrinkage porosite, and the preparation technology presses following step
It is rapid to carry out：
Step 1: dispensing：
1. the furnace charge amount loaded to Medium frequency induction electric melting furnace is 750 kg；
2. then weighed using standard test weight demarcation calibration before dispensing；
3. preparing the various elements content ratio in inovulant needed for, corresponding raw material usage amount is calculated, is made
Charger sheet, various raw material and stand-by are then accurately weighed according to charger sheet；
Step 2: charging：
The order of melting sial lanthanum nucleating agent is：First in the low addition 145kg ferrosilicon of stove, then again by the industry of charger sheet ormal weight
Steel scrap, then add aluminium ingot block, lanthanoid metal block, then add remaining ferrosilicon and silico-calcium, wherein it is 75% that the ferrosilicon added, which is silicone content,
Ferrosilicon；
Step 3: melting：
1. after completing step 2, you can heating, it is 540V, electric current 490A to control Medium frequency induction electric melting furnace voltage, at 58 points
In-furnace temperature is risen to 1345 DEG C within clock, then starts melting；
2. when furnace charge all melts, you can manually stirred, it is determined that after without raw material, you can come out of the stove；
Step 4：Inovulant is come out of the stove ingot casting：
Power is down to 0 first, turndown after standing 9 minutes, molten iron is slowly poured into inovulant mould；
Step 5: inovulant depanning：
The depanning after inovulant is cooled to room temperature, inovulant is hung to inovulant with driving and stacks place, it is neat to stack；Wherein silicon
Aluminium lanthanum nucleating agent block weight is：90 grams ± 10 grams.
Can be to the complicated high-performance thin-walled smallclothes of planform and some positions due to geometric position in above example
Limit to technique, it is impossible to which the problems such as setting rising head or excessive feeding distance is effectively solved, and sial lanthanum nucleating agent can avoid
Iron casting produces shrinkage porosite problem, improves product quality, use range is wide, and limitation is small, while reduces cost.
The technological thought of above example only to illustrate the invention, it is impossible to protection scope of the present invention is limited with this, it is every
According to technological thought proposed by the present invention, any change done on the basis of technical scheme, the scope of the present invention is each fallen within
Within.
Claims (6)
1. the sial lanthanum nucleating agent of anti-iron casting shrinkage porosite according to claim 1, it is characterised in that：The sial lanthanum is pregnant
The percent mass proportioning for educating agent various composition is：Si：70-75%；Al：3.2-4.5%；La：2.0-2.4%；Ca：0.8-1.5%；It is remaining
Measure Fe.
2. the sial lanthanum nucleating agent of anti-iron casting shrinkage porosite according to claim 1, it is characterised in that：The sial lanthanum is pregnant
The percent mass proportioning for educating agent various composition is：Si：73%；Al：3.5%；La：2.3%；Ca：0.9%；Surplus Fe.
3. the sial lanthanum nucleating agent of anti-iron casting shrinkage porosite according to claim 1, it is characterised in that：The sial lanthanum is pregnant
The percent mass proportioning for educating agent various composition is：Si：70%；Al：3.2%；La：2.0%；Ca：0.8%；Surplus Fe.
4. the sial lanthanum nucleating agent of anti-iron casting shrinkage porosite according to claim 1, it is characterised in that：The sial lanthanum is pregnant
The percent mass proportioning for educating agent various composition is：Si：75%；Al：4.5%；La：2.4%；Ca：1.5%；Surplus Fe.
5. the sial lanthanum nucleating agent of anti-iron casting shrinkage porosite according to claim 1, it is characterised in that：The sial lanthanum is pregnant
The percent mass proportioning for educating agent various composition is：Si：72%；Al：3.8%；La：2.2%；Ca：1.2%；Surplus Fe.
6. the sial lanthanum nucleating agent of the anti-iron casting shrinkage porosite according to claim 1-5 any one, it is characterised in that：Institute
The preparation method for stating sial lanthanum nucleating agent is carried out according to the following steps：
Step 1: dispensing：
1. the furnace charge amount loaded to Medium frequency induction electric melting furnace is 600-800 kg；
2. then weighed using standard test weight demarcation calibration before dispensing；
3. preparing the various elements content ratio in inovulant needed for, corresponding raw material usage amount is calculated, is made
Charger sheet, various raw material and stand-by are then accurately weighed according to charger sheet；
Step 2: charging：
The order of melting sial lanthanum nucleating agent is：First in the low addition 100-150kg ferrosilicon of stove, then again by charger sheet ormal weight
Industrial steel scrap, then add aluminium ingot block, lanthanoid metal block, then add remaining ferrosilicon and silico-calcium, wherein it is 75 that the ferrosilicon added, which is the trade mark,
Ferrosilicon or silicone content be 75% ferrosilicon；
Step 3: melting：
1. after completing step 2, you can heating, it is 300-560V, electric current 450- to control Medium frequency induction electric melting furnace voltage
750A, in-furnace temperature is risen to 1320-1350 DEG C within 45-60 minutes, then starts melting；
2. when furnace charge all melts, you can manually stirred, it is determined that after without raw material, you can come out of the stove；
Step 4：Inovulant is come out of the stove ingot casting：
Power is down to 0 first, turndown after standing 5-10 minutes, molten iron is slowly poured into inovulant mould；
Step 5: inovulant depanning：
After inovulant is cooled to room temperature, inovulant is hung to inovulant with driving and stacks place, it is neat to stack；
It is Step 6: broken：
Granularity is crushed on request.
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| CN109929960A (en) * | 2019-04-15 | 2019-06-25 | 南京浦江合金材料股份有限公司 | A kind of silicon strontium inoculant preparation process improving recovery rate |
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