CN105132796A - Medium silicon molybdenum alloy vermicular graphite cast iron glass mold material and preparation method thereof - Google Patents
Medium silicon molybdenum alloy vermicular graphite cast iron glass mold material and preparation method thereof Download PDFInfo
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- CN105132796A CN105132796A CN201510580235.7A CN201510580235A CN105132796A CN 105132796 A CN105132796 A CN 105132796A CN 201510580235 A CN201510580235 A CN 201510580235A CN 105132796 A CN105132796 A CN 105132796A
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Abstract
The invention discloses a medium silicon molybdenum alloy vermicular graphite cast iron glass mold material and a preparation method thereof, and belongs to the technical field of glass mold materials. The medium silicon molybdenum alloy vermicular graphite cast iron glass mold material is composed of, by weight, 3.0-3.2% of carbon, 3.9-4.2% of silicon, 0.3-0.5% of manganese, 0.2-0.4% of molybdenum, 0.08-0.12% of titanium, phosphorus less than 0.05%, sulphur less than 0.03% and the rest iron. The method comprises the steps of smelting, pouring and forming, and annealing. According to the invention, the cost is lowered, the effect is improved, the content of ferrite in the matrix is increased, the plasticity is improved, the elongation rate is increased, the strength of the ferrite matrix is improved, the creep resistance in the process of using molds at high temperature is improved, the oxidation resistance is improved, the hot rack resistance is improved, the oxidation peeling resistance is good, the toughness is improved, and the service life is longer.
Description
Technical field
The invention belongs to glass mold material technical field, relate to a kind of medium-Si, Mo alloy vermicular cast iron glass mold material, and relate to its preparation method.
Background technology
Glass mold is the main equipment producing glasswork, its continually with the high temp glass melt contacts of 600 DEG C-1100 DEG C, subject the effect of oxidation, growth, heat exchange and thermal fatigue etc., simultaneously due to die sinking matched moulds frequently, therefore require that the contact surface of mould has excellent abrasion resistance properties.Specifically, require glass mold surface of internal cavity to have good high temperature resistant, wear resisting property, antioxidant property and corrosion resisting property and use and increase the service life, require that the cylindrical of glass mold has excellent heat dispersion, to adapt to high-speed production demand ideally simultaneously.
The machine-shaping property excellent due to cast iron and relatively low cost, thus become the main raw of current glass mold.Glass mold material based on cast iron is mainly divided into the three major types such as common alloy vermicular cast iron, D type graphite alloy graphitic cast iron and spheroidal graphite cast iron.
CN101942619B recommends there is a kind of alloy gray cast-iron glass mold material and preparation method thereof, its chemical constitution and mass percent thereof are: C3.49-3.65%, Si1.9-2.1%, Ni1-1.3%, Mn0.5-0.7%, Mo0.36-0.5%, Cr0.36-0.6%, Ti<0.08%, V<0.05%, Cu<1%., La < 0.02%, S < 0.16% and P < 0.3%.This patent formula objectively has the technique effect recorded in the technique effect hurdle of specification sheets, specifically: there is resistance to high temperature oxidation, antibiosis is long and resistance to wear and good heat conductivity, and the strong point that intensity and hardness are suitable for.But, expensive and because of containing more carbide, be not easy to the growing amount controlling carbide, large to the Toughness of material is its shortcoming.
The graphite structure form of alloy vermicular cast iron is between flake graphite cast iron and nodular cast iron, its graphite structure and graphitic cast iron and spheroidal graphite cast iron have larger otherness, at eutectic cell interior region, graphite separates and is interconnected as graphitic cast iron, just in matrix, graphite is without the sharp tips as flake graphite, and graphite seems thick, short and round blunt.
Just because of the aforementioned structure of alloy vermicular cast iron, relative to graphitic cast iron, its thermal conductivity does not obviously decline, and mechanical property enhancing more remarkable in graphitic cast iron, there is good thermal fatigue resistance; In addition due to the graphite form of the compacted black iron of alloy between graphitic cast iron and spheroidal graphite cast iron, resistance of oxidation, the anti-energy for growth of tissue are obviously better than flake graphite graphitic cast iron.This depends primarily on the oxidation mechanism of different graphite form, under the high temperature conditions, graphite in microstructure of grey cast iron is mainly based on direct oxidation, graphite in Nodular Iron is in isolated spherical distribution, oxonium ion is diffused into graphite from the interface of graphite and matrix, isolated globular graphite is oxidized one by one, and the graphite structure in vermicular iron matrix is between graphitic cast iron and spheroidal graphite cast iron, therefore its rate of oxidation also falls between, the oxidation rate of magnesium iron is minimum, but because graphite is in isolated spherical distribution, thus cause its radiating effect poor.In Cast Iron Die die cavity, the glass melt heat radiation of melting is slow, and glasswork can not harden by rapid solidification, extends open time, reduces production efficiency, therefore should not adopt.Due to the special construction in vermicular cast iron tissue, thus its oxidation-resistance is better than graphitic cast iron, and thermal conductivity is better than spheroidal graphite cast iron.Thermotolerance and heat conduction are taken into account, form the change of graphite structure Gradient distribution and use meet glass mold different sites to the different requirements of material structure, such as dies cavity contacts with the glass melt of high temperature for a long time, therefore chill is added at dies cavity place during moulding, make mould surface of internal cavity Quench when casting solidification, obtain enough large condensate depression, thus formation globular graphite, along with weakening away from dies cavity iron chill shock chilling ability, middle and cylindrical is transitioned into the higher quasiflake graphite of nodulizing rate gradually.The Gradient distribution change of such a graphite structure, realizes the oxidation-resistance of glass mold and the balance between work-ing life by heat-resisting combining with heat conductivility.
Aforesaid medium-Si, Mo alloy vermicular cast iron is a kind of specific form in vermicular cast iron tissue, it belongs to silicon system heat resisting iron series, be mainly used in vehicle engine exhaust divided manifold at present, but why till sky so far, be not yet seen in the report being applied to glass mold material in disclosed China and foreign countries' patent and non-patent literature, because restrict by some technical bottleneck, typically as the control of nodulizing rate, because for medium-Si, Mo alloy vermicular cast iron, conservative control nodulizing rate not only can obtain good castability, and the antioxidant property of globular graphite and the heat dispersion of quasiflake graphite excellence can be embodied simultaneously, and ensure that glass mold possesses excellent thermal fatigue resistance.Specifically, as long as compactedization power controls proper, so its thermal fatigue resistance life-span can reach about three times of common compacted iron.
Record in specification sheets according to above-mentioned CN101942619B, it can make die life reach 1,000,000 times, the key technical indexes wherein has 2 points: one is obtain larger condensate depression by trace rare-earth and alloy miniaturization process, to obtain D type graphite, improves the intensity of matrix; Two is by microalloy processing mode, adopt in casting ladle, process sub-fraction alloying element, while raising condensate depression increases D type graphite, stop alloying element to separate out form carbide in matrix, reduce toughness of material decline, crack of die etc. the harm because carbide causes, indirectly improve die life.
But as is known in the industry, D type Graphite Iron Cast mentioned by aforementioned CN101942619B is a kind of novel graphitic cast iron, because its graphite generates between the austenite dendrites of prosperity, graphite size is very little, and the austenite dendrites of prosperity can produce destruction to the continuity of graphite, therefore the more conventional A type graphite graphitic cast iron of thermal conductivity can decline to some extent, secondly, it is shaping will have enough condensate depression as described in above-mentioned document, therefore produce full D type graphite generally to adopt to owe to breed and improve condensate depression (inoculation can reduce condensate depression), iron chill shock chilling and add a large amount of V, Ti, the strong carbide alloying elements such as Mo improve condensate depression, carbide generation how is controlled though refer to, but almost cover the alloying element used in all glass molds in this material, how to avoid producing carbide when using many carbides like this and be still a global problem at present, therefore too focus on complicated element proportioning to be easy to form the compound large-size massive carbide being difficult to be eliminated by high-temperature carbonization annealing, and in order to form measure that D type graphite takes as added V, Ti, Mo improves the methods such as molten iron condensate depression and promotes one of approach that carbide generates just, so in two opposite faces of this contradiction, large composite carbide generates unavoidable in the material, therefore the toughness of material can reduce greatly, the ability finally making moulding stock absorb thermal fatigue impact significantly reduces, affect the mold use life-span.
Some defect existed in view of aforementioned CN101942619B and to expensive alloying elements depending on unduly as Ni, V, Ti, Mo, again in line with reduction depending on unduly for noble metal resource, cost-saving, the trim point that searching one is new when not reducing die life.Technical scheme described below produces under this background.
Summary of the invention
Top priority of the present invention be to provide a kind of contribute to significant prolongation glass mold work-ing life, be conducive to use by reducing precious metal carbide and and then reduce carbide generation and improve moulding stock toughness, be of value to the dense oxidation film formed by element silicon stop the further oxidic matrix of oxygen element and use improve material antioxidant property, have the medium-Si, Mo alloy vermicular cast iron glass mold material being convenient to significantly improve thermal fatigue resistance impact capacity.
Another task of the present invention is the preparation method providing a kind of medium-Si, Mo alloy vermicular cast iron glass mold material, the method is conducive to obtaining the excellent globular graphite of a large amount of antioxidant property by inner chamber iron chill shock chilling, and be transitioned into quasiflake graphite gradually along with weakening of Quench ability, meet the service requirements of glass mold; Have and be convenient to by a large amount of Si element solid solution in ferrite matrix, promote the hot strength of ferrite matrix, improve the transformation temperature of moulding stock; Be of value to by Mo element solid solution reinforced ferrite matrix, improve the hot strength of material, reduce material and in high temperature, in thermal fatigue circulation, crack the probability in source and use comprehensive embodiment of the technique effect ensureing medium-Si, Mo alloy vermicular cast iron glass mold material.
Top priority of the present invention completes like this, a kind of medium-Si, Mo alloy vermicular cast iron glass mold material, its chemical element composition and quality % thereof are: the carbon of 3.0-3.2%, the silicon of 3.9-4.2%, the manganese of 0.3-0.5%, the molybdenum of 0.2-0.4%, the titanium of 0.08-0.12%, the phosphorus of <0.05%, the sulphur of <0.03%, all the other are iron.
In a specific embodiment of the present invention, a kind of medium-Si, Mo alloy vermicular cast iron glass mold material, its chemical element composition and quality % thereof are: the carbon of 3%, the silicon of 4%, the manganese of 0.5%, the molybdenum of 0.3%, the titanium of 0.08%, the phosphorus of 0.02%, the sulphur of 0.03%, all the other are iron.
In another specific embodiment of the present invention, a kind of medium-Si, Mo alloy vermicular cast iron glass mold material, its chemical element composition and quality % thereof are: the carbon of 3.2%, the silicon of 3.9%, the manganese of 0.4%, the molybdenum of 0.4%, the titanium of 0.1%, the phosphorus of 0.03%, the sulphur of 0.015%, all the other are iron.
In another specific embodiment of the present invention, a kind of medium-Si, Mo alloy vermicular cast iron glass mold material, its chemical element composition and quality % thereof are: the carbon of 3.1%, the silicon of 4.2%, the manganese of 0.3%, the molybdenum of 0.2%, the titanium of 0.12%, the phosphorus of 0.025%, the sulphur of 0.02%, all the other are iron.
Another task of the present invention has been come like this, and a kind of preparation method of medium-Si, Mo alloy vermicular cast iron glass mold material, comprises the following steps:
A) melting, the pig iron is added in smelting furnace, foundry returns is added after pig iron fusing, and control the weight percent that the pig iron adds, steel scrap is added after foundry returns fusing, molybdenum-iron is added after scrap melting, be incubated after molybdenum-iron fusing, skim after insulation terminates, ferromanganese is added and ferrosilicon carries out slag making deoxidation treatment after skimming, ferrotianium is added when molten iron temperature reaches 1520-1540 DEG C, insulation Overheating Treatment is carried out after ferrotianium fusing, while insulation Overheating Treatment, carry out chemical element sampling analysis and adjust the quality % content of chemical element, then carry out creepage rate and current-following inoculation process, obtain medium-Si, Mo alloy vermicular cast iron liquation to be cast,
B) casting, by by steps A) the medium-Si, Mo alloy vermicular cast iron liquation to be cast that obtains is poured into resin sand single box without in rising head casting mold, before cast, on casting mold, adding a cover the chill loam core of the inner chamber for molding glass mold and in running channel, adding the nucleating agent being intended to carry out late inoculation, casting complete leaves standstill, remove chill loam core, obtain medium-Si, Mo alloy vermicular cast iron glass mold material to be annealed;
C) anneal, by by step B) medium-Si, Mo alloy vermicular cast iron glass mold material to be annealed put in annealing furnace and anneal, control annealing temperature and annealing time, annealing terminates annealing furnace, obtains medium-Si, Mo alloy vermicular cast iron glass mold material.
Also have in a specific embodiment of the present invention, steps A) described in the control pig iron per-cent that adds weight be the add-on of the pig iron is controlled the 10-20% in all furnace charge total masses, the described pig iron is the Q12 pig iron; Described steel scrap is the steel scrap carrying out oil removing and processing of rust removing in advance; Granular molybdenum-iron and the ferrotianium of described molybdenum-iron and ferrotianium to be diameter be 2-6mm; The trade mark of described ferrotianium is TiFe70.
More of the present invention and in a specific embodiment, steps A) described in the temperature carrying out being incubated after molybdenum-iron melts be 1500-1520 DEG C, the time of insulation is 5-8min; The described temperature carrying out being incubated Overheating Treatment after ferrotianium fusing is 1520-1550 DEG C, and soaking time is 10-15min; The quality % content of described adjustment chemical element is adjusted to by the quality % content of chemical element: the carbon of 3.0-3.2%, the silicon of 3.9-4.2%, the manganese of 0.3-0.5%, the molybdenum of 0.2-0.4%, the titanium of 0.08-0.12%, the phosphorus of < 0.05%, the sulphur of < 0.03%, all the other are iron.
In an of the present invention and then specific embodiment, steps A) described in creepage rate be point in molten iron solution to add vermiculizer, the add-on of vermiculizer is the 0.45-0.55% of molten iron total mass, and vermiculizer is made up of the raw material of following weight fraction: magnesium 3.7-4.3 part, group of the lanthanides 8.5-9.5 part, silicon 43-47 part, calcium 1.5-2.5 part and aluminium≤1.2 part; Described current-following inoculation process points in molten iron solution to add the nucleating agent that the trade mark is SiFe75, and the particle diameter of this calcium SiFe75 nucleating agent is 1-3mm, and add-on is the 0.35-0.45% of molten iron solution total mass.
Of the present invention again more and in a specific embodiment, step B) described in nucleating agent be Powdered nucleating agent, add-on is the 0.08-0.12% of the total mass of described medium-Si, Mo alloy vermicular cast iron liquation to be cast; Described Powdered nucleating agent is silicon titanate innoculant, and this silicon titanate innoculant is made up of the raw material of following mark by weight: silicon 55-65 part, barium 4-6 part, calcium 0.5-2.5 part and aluminium 1.5-2.5 part, described time of repose is 20-30min.
In an again of the present invention and then specific embodiment, step C) described in control annealing temperature be annealing temperature is controlled between 930-960 DEG C, described annealing time is 4-6h.
Technical scheme provided by the invention has following technique effect: 1. because alloying element and quality % thereof select rationally, be thus not only conducive to saving precious metal material and reduce the kind using precious metal element, reaching the effect of cost efficiency, selected alloying element kind and proportioning have the effect of 1+1>2 simultaneously, 2. because the element silicon in formula has the ferritic effect of strong formation, thus the generation of carbide, perlite and ternary iron phosphide eutectic can not only be suppressed, meanwhile, the raising of silicone content too increases ferritic content in matrix, improves plasticity and the elongation of material, 3. element silicon is solidly soluted in ferrite matrix in a large number, not only enhance the intensity of ferrite matrix, improve the creep strength in mould applied at elevated temperature process, it compares the transformation temperature that common compacted iron substantially increases material simultaneously, the ferritic phase that moulding stock can be made in use to remain single, decreases moulding stock in the past in the transformation temperature growth of the material caused due to phase transformation between perlite and ferrite that causes of frequent phase transformation thus the orange peel phenomenon caused up and down, 4. because a large amount of element silicons can form the oxide film of one deck densification, oxide film compact structure, resistivity are comparatively large, and thus metal ion and oxonium ion not easily pass through him and spread, thus indirectly enhance the antioxidant property of material, 5. the molybdenum element selected by can be solidly soluted in ferrite base body tissue, forms stable Fe
3mo
3c, reinforced ferrite matrix, alleviates the trend that ferrite matrix is softening in high temperature, improves the creep resisting ability of material, it also reduces the stacking fault energy of material while producing solution strengthening, make it be easy to form dislocation, and bonding force between molybdenum atom and iron matrix atom is comparatively strong, increases diffusion activation energy, thus improve the hot strength of material, significantly can resist the ability of thermal crack by strongthener by this, 6. the rare-earth vermiculizer of creepage rate employing, adding of rare earth has not only purified the purity of molten iron, decrease hazardous trace elements S in material, the negative effect of P etc., rare earth element is as " industrial monosodium glutamate " simultaneously, its existence is made cast iron at the oxidation initial stage, the first rapid oxidation of surperficial and neighbouring trace rare-earth element, form internal oxidition district, surface strengthening is made by dispersion hardening effect, thus avoid the generation that alloy surface circumvolution oxide skin and matrix rise and fall, improve the adhesivity between die matrix and oxide skin, bonding strength between oxide film and matrix is improved, thus moulding stock is made to have good anti-oxidant peel-ability, 7. by the use of the post inoculant in type, the segregation of Mo element can be prevented, stop it and form the thick composite carbon compound containing Mo at grain boundaries, reduce mould in use because large-scale carbide decomposes the formation of crack caused, breed for twice when can make molten iron crystallization simultaneously and form more eutectic cell, crystal grain thinning, not only enhance the intensity of material itself, longer crystal boundary length can be obtained simultaneously, add the toughness of material, material can be enable to absorb more thermal fatigue and impact, obtain better work-ing life.
Embodiment
Embodiment 1:
A) melting, in smelting furnace (electric furnace), add the trade mark is the Q12 pig iron, the add-on of the pig iron controls in 15% of all furnace charge total masses, foundry returns is added after pig iron fusing, foundry returns is as the Silicon In Alloys molybdenum vermicular cast iron glass mold scrapped, the steel scrap in advance through oil removing and processing of rust removing is added after foundry returns fusing, after scrap melting and temperature rises to 1450-1460 DEG C time add granular and particle diameter is the molybdenum-iron of 2-6mm, be incubated after molybdenum-iron fusing, holding temperature is 1500 DEG C, soaking time is 5min, skim after insulation terminates, ferromanganese is added successively and ferrosilicon carries out deoxidation slag making after skimming, namely slag making deoxidation treatment is carried out, ferromanganese is added and ferrosilicon carries out slag making deoxidation treatment after molten iron temperature is skimmed, ferrotianium is added when molten iron temperature reaches 1520 DEG C, insulation Overheating Treatment is carried out after ferrotianium fusing, the holding temperature of insulation Overheating Treatment is 1520 DEG C, soaking time is 13min, insulation while sampling analysis and the mass percentage of the chemical element of molten iron is adjusted to 3.0% carbon, the silicon of 4%, the manganese of 0.5%, the molybdenum of 0.3%, the titanium of 0.08%, the sulphur of 0.03%, the phosphorus of 0.02%, all the other are iron, then carry out compactedization and current-following inoculation process, creepage rate points to the vermiculizer adding 0.5% of molten iron total mass in liquation and molten iron, vermiculizer is made up of the raw material of following mass fraction: 3.7 parts, magnesium, group of the lanthanides (RE) 8.8 parts, silicon 47 parts, calcium 2 parts and 1 part, aluminium, current-following inoculation process be point in liquation and molten iron add molten iron total mass 0.45% and the trade mark is SiFe75 and particle diameter is the nucleating agent of 1-3mm, obtain Silicon In Alloys molybdenum vermicular cast iron liquation to be cast.
B) casting, alloy vermicular cast iron liquation to be cast is poured into resin sand single box without in rising head casting mold, before cast, on casting mold, adding a cover the chill loam core of the inner chamber for molding glass mold and in running channel, adding the nucleating agent being intended to carry out late inoculation, casting complete removes chill loam core after leaving standstill 30min, obtains to be annealed and is the medium-Si, Mo alloy vermicular cast iron glass mold material of as cast condition.Nucleating agent described in this step is Powdered nucleating agent, the add-on of this Powdered nucleating agent is 0.08% of Silicon In Alloys molybdenum vermicular cast iron liquation total mass to be cast, and Powdered nucleating agent is silicon titanate innoculant, it is made up of following raw material by weight: silicon 65 parts, barium 4 parts, calcium 1.5 parts and 2.5 parts, aluminium;
C) anneal, step B is obtained to be annealed and carry out high-temperature carbonization annealing for the medium-Si, Mo alloy vermicular cast iron moulding stock of as cast condition is put in annealing furnace, annealing holding temperature is 950 DEG C, soaking time is 4h, cool to room temperature with the furnace after insulation terminates, obtaining medium-Si, Mo alloy vermicular cast iron moulding stock, is 95% through checking its ferrite content, content of pearlite in alloy is 5%, and inner chamber hardness is 185Hb.
Embodiment 2:
A) melting, in smelting furnace (electric furnace), add the trade mark is the Q12 pig iron, the add-on of the pig iron controls in 20% of all furnace charge total masses, foundry returns is added after pig iron fusing, foundry returns is as the Silicon In Alloys molybdenum vermicular cast iron glass mold scrapped, the steel scrap in advance through oil removing and processing of rust removing is added after foundry returns fusing, after scrap melting and temperature rises to 1450-1460 DEG C time add granular and particle diameter is the molybdenum-iron of 2-6mm, be incubated after molybdenum-iron fusing, holding temperature is 1520 DEG C, soaking time is 8min, skim after insulation terminates, ferromanganese is added successively and ferrosilicon carries out deoxidation slag making after skimming, namely slag making deoxidation treatment is carried out, ferromanganese is added and ferrosilicon carries out slag making deoxidation treatment after molten iron temperature is skimmed, ferrotianium is added when molten iron temperature reaches 1540 DEG C, insulation Overheating Treatment is carried out after ferrotianium fusing, the holding temperature of insulation Overheating Treatment is 1535 DEG C, soaking time is 15min, insulation while sampling analysis and the mass percentage of the chemical element of molten iron is adjusted to 3.2% carbon, the silicon of 3.9%, the manganese of 0.4%, the molybdenum of 0.4%, the titanium of 0.1%, the sulphur of 0.015%, the phosphorus of 0.03%, all the other are iron, then carry out compactedization and current-following inoculation process, creepage rate points to the vermiculizer adding 0.55% of molten iron total mass in liquation and molten iron, vermiculizer is made up of the raw material of following mass fraction: 4 parts, magnesium, group of the lanthanides (RE) 8.5 parts, silicon 43 parts, calcium 1.5 parts and 2 parts, aluminium, current-following inoculation process be point in liquation and molten iron add molten iron total mass 0.35% and the trade mark is SiFe75 and particle diameter is the nucleating agent of 1-3mm, obtain Silicon In Alloys molybdenum vermicular cast iron liquation to be cast.
B) casting, alloy vermicular cast iron liquation to be cast is poured into resin sand single box without in rising head casting mold, before cast, on casting mold, adding a cover the chill loam core of the inner chamber for molding glass mold and in running channel, adding the nucleating agent being intended to carry out late inoculation, casting complete removes chill loam core after leaving standstill 20min, obtains to be annealed and is the medium-Si, Mo alloy vermicular cast iron glass mold material of as cast condition.Nucleating agent described in this step is Powdered nucleating agent, the add-on of this Powdered nucleating agent is 0.1% of Silicon In Alloys molybdenum vermicular cast iron liquation total mass to be cast, and Powdered nucleating agent is silicon titanate innoculant, it is made up of following raw material by weight: silicon 55 parts, barium 6 parts, calcium 0.5 part and 1.5 parts, aluminium;
C) anneal, step B is obtained to be annealed and carry out high-temperature carbonization annealing for the medium-Si, Mo alloy vermicular cast iron moulding stock of as cast condition is put in annealing furnace, annealing holding temperature is 930 DEG C, soaking time is 6h, cool to room temperature with the furnace after insulation terminates, obtaining medium-Si, Mo alloy vermicular cast iron moulding stock, is 96% through checking its ferrite content, content of pearlite in alloy is 4%, and inner chamber hardness is 183Hb.
Embodiment 3:
A) melting, in smelting furnace (electric furnace), add the trade mark is the Q12 pig iron, the add-on of the pig iron controls in 10% of all furnace charge total masses, foundry returns is added after pig iron fusing, foundry returns is as the Silicon In Alloys molybdenum vermicular cast iron glass mold scrapped, the steel scrap in advance through oil removing and processing of rust removing is added after foundry returns fusing, after scrap melting and temperature rises to 1450-1460 DEG C time add granular and particle diameter is the molybdenum-iron of 2-6mm, be incubated after molybdenum-iron fusing, holding temperature is 1510 DEG C, soaking time is 6.5min, skim after insulation terminates, ferromanganese is added successively and ferrosilicon carries out deoxidation slag making after skimming, namely slag making deoxidation treatment is carried out, ferromanganese is added and ferrosilicon carries out slag making deoxidation treatment after molten iron temperature is skimmed, ferrotianium is added when molten iron temperature reaches 1530 DEG C, insulation Overheating Treatment is carried out after ferrotianium fusing, the holding temperature of insulation Overheating Treatment is 1550 DEG C, soaking time is 10min, insulation while sampling analysis and the mass percentage of the chemical element of molten iron is adjusted to 3.1% carbon, the silicon of 4.2%, the manganese of 0.3%, the molybdenum of 0.2%, the titanium of 0.12%, the sulphur of 0.02%, the phosphorus of 0.025%, all the other are iron, then carry out compactedization and current-following inoculation process, creepage rate points to the vermiculizer adding 0.45% of molten iron total mass in liquation and molten iron, vermiculizer is made up of the raw material of following mass fraction: 4.3 parts, magnesium, group of the lanthanides (RE) 9.5 parts, silicon 45 parts, calcium 2.5 parts and 1.5 parts, aluminium, current-following inoculation process be point in liquation and molten iron add molten iron total mass 0.4% and the trade mark is SiFe75 and particle diameter is the nucleating agent of 1-3mm, obtain Silicon In Alloys molybdenum vermicular cast iron liquation to be cast.
B) casting, alloy vermicular cast iron liquation to be cast is poured into resin sand single box without in rising head casting mold, before cast, on casting mold, adding a cover the chill loam core of the inner chamber for molding glass mold and in running channel, adding the nucleating agent being intended to carry out late inoculation, casting complete removes chill loam core after leaving standstill 25min, obtains to be annealed and is the medium-Si, Mo alloy vermicular cast iron glass mold material of as cast condition.Nucleating agent described in this step is Powdered nucleating agent, the add-on of this Powdered nucleating agent is 0.12% of Silicon In Alloys molybdenum vermicular cast iron liquation total mass to be cast, and Powdered nucleating agent is silicon titanate innoculant, it is made up of following raw material by weight: silicon 60 parts, barium 5 parts, calcium 2.5 parts and 2 parts, aluminium;
C) anneal, step B is obtained to be annealed and carry out high-temperature carbonization annealing for the medium-Si, Mo alloy vermicular cast iron moulding stock of as cast condition is put in annealing furnace, annealing holding temperature is 940 DEG C, soaking time is 5h, cool to room temperature with the furnace after insulation terminates, obtaining medium-Si, Mo alloy vermicular cast iron moulding stock, is 96% through checking its ferrite content, content of pearlite in alloy is 4.5%, and inner chamber hardness is 184Hb.
In sum, technical scheme provided by the invention overcomes the deficiency in prior art, completes invention task satisfactorily, has cashed the technique effect of seven aspects concluded in the superincumbent technique effect hurdle of applicant faithfully.
Claims (10)
1. a medium-Si, Mo alloy vermicular cast iron glass mold material, it is characterized in that its chemical element composition and quality % thereof are: the carbon of 3.0-3.2%, the silicon of 3.9-4.2%, the manganese of 0.3-0.5%, the molybdenum of 0.2-0.4%, the titanium of 0.08-0.12%, the phosphorus of <0.05%, the sulphur of <0.03%, all the other are iron.
2. medium-Si, Mo alloy vermicular cast iron glass mold material according to claim 1, is characterized in that its chemical element composition and quality % thereof are: the carbon of 3%, the silicon of 4%, the manganese of 0.5%, the molybdenum of 0.3%, the titanium of 0.08%, the phosphorus of 0.02%, the sulphur of 0.03%, all the other are iron.
3. medium-Si, Mo alloy vermicular cast iron glass mold material according to claim 1, is characterized in that its chemical element composition and quality % thereof are: the carbon of 3.2%, the silicon of 3.9%, the manganese of 0.4%, the molybdenum of 0.4%, the titanium of 0.1%, the phosphorus of 0.03%, the sulphur of 0.015%, all the other are iron.
4. medium-Si, Mo alloy vermicular cast iron glass mold material according to claim 1, is characterized in that its chemical element composition and quality % thereof are: the carbon of 3.1%, the silicon of 4.2%, the manganese of 0.3%, the molybdenum of 0.2%, the titanium of 0.12%, the phosphorus of 0.025%, the sulphur of 0.02%, all the other are iron.
5. a preparation method for medium-Si, Mo alloy vermicular cast iron glass mold material as claimed in claim 1, is characterized in that comprising the following steps:
A) melting, the pig iron is added in smelting furnace, foundry returns is added after pig iron fusing, and control the weight percent that the pig iron adds, steel scrap is added after foundry returns fusing, molybdenum-iron is added after scrap melting, be incubated after molybdenum-iron fusing, skim after insulation terminates, ferromanganese is added and ferrosilicon carries out slag making deoxidation treatment after skimming, ferrotianium is added when molten iron temperature reaches 1520-1540 DEG C, insulation Overheating Treatment is carried out after ferrotianium fusing, while insulation Overheating Treatment, carry out chemical element sampling analysis and adjust the quality % content of chemical element, then carry out creepage rate and current-following inoculation process, obtain medium-Si, Mo alloy vermicular cast iron liquation to be cast,
B) casting, by by steps A) the medium-Si, Mo alloy vermicular cast iron liquation to be cast that obtains is poured into resin sand single box without in rising head casting mold, before cast, on casting mold, adding a cover the chill loam core of the inner chamber for molding glass mold and in running channel, adding the nucleating agent being intended to carry out late inoculation, casting complete leaves standstill, remove chill loam core, obtain medium-Si, Mo alloy vermicular cast iron glass mold material to be annealed;
C) anneal, by by step B) medium-Si, Mo alloy vermicular cast iron glass mold material to be annealed put in annealing furnace and anneal, control annealing temperature and annealing time, annealing terminates annealing furnace, obtains medium-Si, Mo alloy vermicular cast iron glass mold material.
6. the preparation method of medium-Si, Mo alloy vermicular cast iron glass mold material according to claim 5, it is characterized in that steps A) described in the control pig iron per-cent that adds weight be the add-on of the pig iron is controlled the 10-20% in all furnace charge total masses, the described pig iron is the Q12 pig iron; Described steel scrap is the steel scrap carrying out oil removing and processing of rust removing in advance; Granular molybdenum-iron and the ferrotianium of described molybdenum-iron and ferrotianium to be diameter be 2-6mm; The trade mark of described ferrotianium is TiFe70.
7. the preparation method of medium-Si, Mo alloy vermicular cast iron glass mold material according to claim 5, is characterized in that steps A) described in the temperature carrying out being incubated after molybdenum-iron melts be 1500-1520 DEG C, the time of insulation is 5-8min; The described temperature carrying out being incubated Overheating Treatment after ferrotianium fusing is 1520-1550 DEG C, and soaking time is 10-15min; The quality % content of described adjustment chemical element is adjusted to by the quality % content of chemical element: the carbon of 3.0-3.2%, the silicon of 3.9-4.2%, the manganese of 0.3-0.5%, the molybdenum of 0.2-0.4%, the titanium of 0.08-0.12%, the phosphorus of < 0.05%, the sulphur of < 0.03%, all the other are iron.
8. the preparation method of medium-Si, Mo alloy vermicular cast iron glass mold material according to claim 5, it is characterized in that steps A) described in creepage rate be point in molten iron solution to add vermiculizer, the add-on of vermiculizer is the 0.45-0.55% of molten iron total mass, and vermiculizer is made up of the raw material of following weight fraction: magnesium 3.7-4.3 part, group of the lanthanides 8.5-9.5 part, silicon 43-47 part, calcium 1.5-2.5 part and aluminium≤1.2 part; Described current-following inoculation process points in molten iron solution to add the nucleating agent that the trade mark is SiFe75, and the particle diameter of this calcium SiFe75 nucleating agent is 1-3mm, and add-on is the 0.35-0.45% of molten iron solution total mass.
9. the preparation method of medium-Si, Mo alloy vermicular cast iron glass mold material according to claim 5, it is characterized in that step B) described in nucleating agent be Powdered nucleating agent, add-on is the 0.08-0.12% of the total mass of described medium-Si, Mo alloy vermicular cast iron liquation to be cast; Described Powdered nucleating agent is silicon titanate innoculant, and this silicon titanate innoculant is made up of the raw material of following mark by weight: silicon 55-65 part, barium 4-6 part, calcium 0.5-2.5 part and aluminium 1.5-2.5 part, described time of repose is 20-30min.
10. the preparation method of medium-Si, Mo alloy vermicular cast iron glass mold material according to claim 5, is characterized in that step C) described in control annealing temperature be that annealing temperature is controlled as between 930-960 DEG C, described annealing time is 4-6h.
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| CN109295383A (en) * | 2018-10-25 | 2019-02-01 | 苏州市通润机械铸造有限公司 | A kind of high-intensitive high nodular iron casting and preparation method thereof extended |
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