CN102071351B - Vermicularizing treatment process of vanadium-titanium vermicular graphite cast iron - Google Patents
Vermicularizing treatment process of vanadium-titanium vermicular graphite cast iron Download PDFInfo
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Abstract
The invention discloses a vermicularizing treatment process of vanadium-titanium vermicular graphite cast iron. The process comprises the following steps: preparing raw materials into the following components by weight percent: 3.4-3.9% of carbon, 2.1-2.8% of silicon, 0.5-0.9% of manganese, less than or equal to 0.10% of phosphorus, less than or equal to 0.07% of sulfur, 0.10-0.35% of vanadium, 0.1-0.25% of titanium and the balance of iron and inevitable impurities; melting vanadium-titanium magnetite, and then, directly transferring the obtained molten iron with a high temperature of 1320 DEG C-1350 DEG C into an intermediate frequency electric furnace for smelling; discharging the molten iron at the temperature of 1450 DEG C-1480 DEG C after the furnace components of the molten iron are qualified by testing; pouring the molten iron into a casting treatment ladle by using a crushing method for carrying out vermicularizing treatment and inoculation treatment; and after the treatment, standing for 2-3 minutes for casting. The process disclosed by the invention has the advantages of simple process flow and low energy consumption, the vanadium-titanium vermicular graphite cast iron prepared by the process disclosed by the invention has excellent properties, and various indexes meet the requirements.
Description
Technical field
The present invention relates to the material field of metallurgy, particularly a kind of wriggling of vermicular cast iron treatment process.
Background technology
Because graphitic cast iron has castability preferably, is applied to a plurality of fields.It is satisfactory that but physical and mechanical property, physical strength, resistance to low temperature and the thermal fatigue resistance of the product of graphitic cast iron preparation are difficult in practical process, and in use occur the phenomenon of thermal crack and quick abrasion easily, causes certain potential safety hazard.Can obtain high-strength alloy graphitic cast iron through adding alloying element; Mainly adopt high C low-alloy V, Mo graphitic cast iron like states such as Great Britain and Americas; States such as Russia mainly adopt Cr, Ni, Mo alloy gray cast-iron; But, make the production cost of above-mentioned cast alloy iron higher owing to added noble alloy elements such as Ni, Mo.When producing brake drum for automobile or retarding disc, just mainly is to adopt the low-alloy grey-cast iron material like domestic and international many enterprises.
Therefore; From operation cost and safety perspective; Exploitation has the physical strength height, good heat conductivity, and the type material of high comprehensive performance such as thermal fatigue resistance is good, be not prone to thermal crack, low temperature resistant replaces gray cast iron material to have important engineering application value and realistic meaning.
The melting method of cast iron is to adopt blast furnace to produce foundry iron at present, produces cast iron with cupola furnace or electric furnace secondary fusion then.Abroad, mainly adopt cupola furnace to add the electric furnace duplexing, obtain the high-quality molten casting iron, form and produce in enormous quantities.At home, large-lot producer has adopted with external identical cupola furnace and has added electric furnace duplexing production cast iron, also has more medium-sized and small enterprises to adopt independent cupola melting to produce cast iron or furnace melting production cast iron.The molten iron temperature of cupola melting is low, and the cast iron of production is of low quality; The furnace melting molten iron temperature is high, and the cast iron quality of production is high, but energy-output ratio is big, and cost is high.More than production model both domestic and external all have the secondary fusion process.
The selection of vermiculizer type and vermiculizer add-on, adding method are two critical problems in the wriggling treatment process.It is that vermiculizer, rare earth are that vermiculizer and calcium are vermiculizer that the vermiculizer that uses at present mainly contains magnesium.Magnesium is that wriggling of vermiculizer ability is the strongest, have from the boiling ability, but its adding scope is less, and specific absorption is low; Calcium be wriggling of vermiculizer ability a little less than, it adds a wider range, but reaction is slower, does not have from the boiling ability; Rare earth is that the wriggling ability and the speed of response of vermiculizer is that vermiculizer and calcium are between the vermiculizer between magnesium, and wriggling ability is moderate, but does not have from the boiling ability.
Summary of the invention
The object of the present invention is to provide a kind of wriggling of vanadium titanium vermicular cast iron treatment process; 1320 ℃～1350 ℃ high temperature liquid irons that utilize vanadium titano-magnetite fusing back to obtain directly change intermediate frequency furnace over to and carry out melting; Smelting temperature is greater than 1500 ℃; Save the secondary fusion process, improved the quality of molten iron, greatly saved the energy.And the present invention utilizes the pig iron of Flos Bombacis Malabarici to be rich in the characteristics of V, Ti element, under the situation that does not add other alloying element, can prepare the cast article that over-all properties is superior to adding alloying elements such as Ni, Mo, and cost reduces relatively.The mixing vermiculizer that relates among the present invention has the advantage that magnesium is vermiculizer and rare earth vermiculizer concurrently, and existing from seething with excitement function, the add-on scope of vermiculizer is broad also, when sulphur content fluctuates within the specific limits, still can obtain the higher vanadium titanium vermicular cast iron of nodulizing rate.Vermiculizer adding method among the present invention is simple, and the metallization processes of wriggling is stable, and effect is remarkable.The vanadium titanium vermicular cast iron product performance of using the production of wriggling of the present invention treatment process are stable, are superior to common grey iron, alloy gray cast-iron performance of products.
According to wriggling of vanadium titanium vermicular cast iron treatment process of the present invention, may further comprise the steps:
A prepares raw material, and raw materials by weight is configured to following component: carbon is 3.4～3.9%, and silicon is 2.1～2.8%; Manganese is 0.5～0.9%, phosphorus≤0.10%, sulphur≤0.07%; Vanadium is 0.10～0.35%, and titanium is 0.10～0.25%, and surplus is iron and unavoidable impurities;
1320 ℃～1350 ℃ high temperature liquid irons that b obtains vanadium titano-magnetite fusing back directly change intermediate frequency furnace over to and carry out melting, and smelting temperature is greater than 1500 ℃.
Before the c molten iron is come out of the stove, will pour into a mould pack processing and toast, then vermiculizer, 2/3 nucleating agent and insulating covering agent placed bag end tamping at 300～450 ℃;
After composition chemical examination in d molten iron stokehold is qualified, come out of the stove in 1450 ℃～1480 ℃, adopt the method that pours to pour molten iron into cast pack processing wriggling processing and inoculation;
Pour molten iron in the stove into the cast pack processing during processing of wriggling of e; Pour the molten iron of pouring ladle capacity 2/3 earlier into; Treat to pour into again after stir process evenly the molten iron of pouring ladle capacity 1/3, simultaneously remaining 1/3 nucleating agent is added with stream, add insulating covering agent afterwards in the molten iron surface; Can be used for cast after leaving standstill 2-3min, teeming temperature is 1340 ℃～1380 ℃.
According to wriggling of vanadium titanium vermicular cast iron treatment process of the present invention, wherein, said vermiculizer is the mixture of rare earth ferrosilicomagnesium and rare earth ferrosilicon, and the add-on of said vermiculizer is 1.2%～1.8% of a weight of molten iron.
According to wriggling of vanadium titanium vermicular cast iron treatment process of the present invention, wherein, said vermiculizer is mixed by rare earth ferrosilicomagnesium and rare earth ferrosilicon, and wherein the weight percent of rare earth ferrosilicon is 60%～80%.Rare earth ferrosilicon and rare earth ferrosilicomagnesium add with the fine particle shape, and rare earth ferrosilicon particulate granularity is 5～10mm, and rare earth ferrosilicomagnesium particulate granularity is 10～15mm.
According to wriggling of vanadium titanium vermicular cast iron treatment process of the present invention, wherein, said nucleating agent is 75SiFe, and the add-on of said nucleating agent is 0.6%～1.2% of a weight of molten iron.
According to wriggling of vanadium titanium vermicular cast iron treatment process of the present invention, wherein, said insulating covering agent is for gathering slag insulating covering agent or plant ash.
According to wriggling of vanadium titanium vermicular cast iron treatment process of the present invention, wherein, the granularity of said 75SiFe is 5～10mm.
According to wriggling of vanadium titanium vermicular cast iron treatment process of the present invention, wherein, the smelting temperature of said b step is 1500 ℃～1560 ℃.
Embodiment
Raw materials by weight of the present invention is configured to following component: carbon is 3.4～3.9%, and silicon is 2.1～2.8%, and manganese is 0.5～0.9%, phosphorus≤0.10%, and sulphur≤0.07%, vanadium are 0.10～0.35%; Titanium is 0.10～0.25%, and surplus is iron and unavoidable impurities.
Wherein carbon and silicon all are the strong graphited elements that promotes.Carbon and silicone content are high, and graphite quantity is many in the foundry goods tissue.To the special foundry goods such as automobile brake drum heat-resisting, that wear resisting property is had relatively high expectations, require to have the graphite of some amount in the tissue, higher carbon equivalent ce is promptly arranged, wherein CE=C+1/3 (Si+P).Improve carbon equivalent and help to reduce chilling tendency; But carbon equivalent ce can not be too high; Otherwise the perlite quantity not sufficient in the tissue, ferrite content increases, and mechanical property (intensity and hardness) is reduced; Thereby do not reach the desired mechanical property of goods, so the CE=4.3% of vermicular cast iron～4.8%.
The content of carbon generally gets 3.0%～4.0%, generally carbon content is controlled in 3.4～3.9% scopes aborning, can make the molten iron good fluidity in this scope, is prone to feeding, shrinks for a short time, can obtain good castability.
Silicon to matrix effect very significantly mainly is used for preventing spoken parts in traditional operas, control matrix Medium pearlite quantity.Along with the silicon amount increases, matrix Medium pearlite amount reduces gradually, and ferrite content increases.In order to obtain higher performance requriements, need to obtain the vermicular cast iron of pearlite matrix, at this moment, can suitably reduce the silicon amount.Owing to generally contain a large amount of silicon in the vermiculizer, so when preparing burden, base iron must be hanged down silicon.The final content of silicon can be controlled in 2.1～2.8%, and optimum content is controlled at 2.3～2.7%.
Manganese influences wriggling of graphite nothing in conventional content.Manganese plays in vermicular cast iron stablizes pearlitic effect, causes the effect of manganese to weaken because the graphite branch is various in the vermicular cast iron.If require to obtain the higher ferrite matrix vermicular cast iron of toughness, then manganese content should be less than 0.4%.In the present invention, in order to adapt to required strength property requirement, and the content of matrix Medium pearlite should be more than 50%, and therefore selected manganese content range is 0.5%～0.9%, so that obtain more pearlite matrix.
Sulphur all has very big avidity with all wriggling elements (being mainly magnesium and rare earth), at first is consumed in desulfurization and deoxidation in the wriggling element adding iron liquid, and sulphur content in the iron liquid is reduced to less than 0.03%, and wriggling of residue element just makes wriggling of graphite.The original iron melt sulfur-bearing is many more, and it is also many more to consume vermiculizer.The vermiculizer add-on is many more, and the sulfuration slag inclusion of formation is also many more, and is both uneconomical, endangers the performance of material again, quickens vermiculation.But sulphur has the effect that enlarges the vermiculizer add-on within the specific limits, promptly in the vermiculizer add-on scope of broad, all can obtain vermicular cast iron.This is that sulphur is produced favourable one side to vermicular cast iron.Take all factors into consideration the back the present invention in sulphur content be controlled at≤0.07%.
Phosphorus content is too high can to form steadite, and it reduces impact toughness, improves brittle transition temperature, makes foundry goods be prone to shrinkage porosite and cold cracking.Therefore the content of phosphorus generally should be controlled at below 0.08%.But the formed steadite disperse of a certain amount of phosphorus is distributed with and helps improve hardness, and wear resisting property improves, so can suitably improve the content of phosphorus for wearing piece.Take all factors into consideration the back the present invention in phosphorus content be controlled at≤0.10%.
Contain V and about 0.25% Ti about 0.3% during the present invention is raw materials used; This refinement effectively, stablize perlite; V has high avidity and forms the high sclerosis of microhardness vanadium titanium carbon nitrogen compound mutually with carbon, nitrogen with Ti simultaneously, improves intensity, wear resisting property and heat-resistant anti-fatigue performance.In addition, V, Ti have increased chilling tendency, and it is tension-active element that Ti belongs to interference element, can suitably widen wriggling scope, help wriggling processing, so the content of vanadium is 0.10%～0.35% among the present invention, and the content of titanium is 0.10%～0.25%.If the vanadium titanium content is lower than 0.10%, the carboritride of formation does not seldom have the effect that improves intensity and wear resistance.Prescribe a time limit when the vanadium titanium content is higher than, the vanadium titanium carbon nitrogen compound of formation is too much, and the intensity hardness value is too high, be difficult for processing, and anti-spheroidization is strong excessively, is unfavorable for wriggling processing.
The present invention directly utilizes the high temperature liquid iron after the vanadium titano-magnetite melting to be adjusted to branch through electric furnace and obtains vanadium titanium vermicular cast iron, has avoided the secondary smelting process, has practiced thrift the energy.The present invention makes full use of the pig iron that is rich in V, Ti element, like the pig iron that is rich in the vanadium titanium of vanadium titanium bases such as Flos Bombacis Malabarici production; Vanadium titanium vermicular cast iron of the present invention has improved the tensile strength and the wear resisting property of cast iron materials through wriggling processing, can be widely used in the cast prod that over-all properties is had relatively high expectations.As be used for producing brake drum for automobile, retarding disc, and engine cylinder-body cylinder cap, exhaust manifold etc., these The comprehensive performance are greatly improved.
It is that vermiculizer and rare earth are the advantage of vermiculizer that rare earth magnesium ferrosilicon alloy vermiculizer has in the market had magnesium concurrently; Since in the high temperature vanadium-titanium-iron-water that the present invention adopts except that containing common tension-active element sulphur; Also contain tension-active elements such as titanium; And do not have rare earth and the suitable rare earth magnesium ferrosilicon alloy vermiculizer of magnesium ratio to can be used as the vermiculizer of high temperature vanadium-titanium-iron-water in the national standard; As use the single rare earth magnesium ferro-silicon vermiculizer in the national standard, then therefore vermiculation effect difference and instability finally adopt the mixing vermiculizer among the present invention.Adopt the mixing vermiculizer of mentioning among the present invention to have the advantage that magnesium is vermiculizer and rare earth vermiculizer concurrently; Existing from seething with excitement function; The add-on scope of vermiculizer is broad also, when sulphur content fluctuates within the specific limits, still can obtain the higher vanadium titanium vermicular cast iron of nodulizing rate.Vermiculizer adding method among the present invention is simple, and the metallization processes of wriggling is stable, and effect is remarkable.
Wriggling of vanadium titanium vermicular cast iron treatment process according to the invention may further comprise the steps: the preparation raw material, and raw materials by weight is configured to following component: carbon is 3.4～3.9%; Silicon is 2.1～2.8%, and manganese is 0.5～0.9%, phosphorus≤0.10%; Sulphur≤0.07%; Vanadium is 0.10～0.35%, and titanium is 0.10～0.25%, and surplus is iron and unavoidable impurities; Directly change 1320 ℃～1350 ℃ high temperature liquid irons that obtain after the vanadium titano-magnetite fusing over to intermediate frequency furnace and carry out melting, smelting temperature is greater than 1500 ℃, and optimum is 1500～1560 ℃; Before above-mentioned molten iron is come out of the stove, will pour into a mould pack processing and toast, then vermiculizer, 2/3 nucleating agent and insulating covering agent placed bag end tamping at 300 ℃～450 ℃; After composition chemical examination in above-mentioned molten iron stokehold is qualified, come out of the stove in 1450 ℃～1480 ℃, adopt the method that pours to pour molten iron into cast pack processing wriggling processing and inoculation; Pour molten iron in the stove into the cast pack processing during wriggling processing; Pour the molten iron of pouring ladle capacity 2/3 earlier into; Treat to pour into again after stir process evenly the molten iron of pouring ladle capacity 1/3, simultaneously remaining 1/3 nucleating agent is added with stream, add afterwards that insulating covering agent promptly gathers the slag insulating covering agent or plant ash is surperficial in molten iron; Can be used for cast after leaving standstill 2-3min, teeming temperature is 1340 ℃～1380 ℃.
According to wriggling of vanadium titanium vermicular cast iron treatment process of the present invention, wherein, said vermiculizer is the mixture of rare earth ferrosilicomagnesium and rare earth ferrosilicon, and the add-on of said vermiculizer is 1.2%～1.8% of a weight of molten iron.Said vermiculizer is mixed by rare earth ferrosilicomagnesium and rare earth ferrosilicon, and wherein the weight percent of rare earth ferrosilicon is 60%～80%.Rare earth ferrosilicon and rare earth ferrosilicomagnesium add with the fine particle shape, and rare earth ferrosilicon particulate granularity is 5～10mm, and rare earth ferrosilicomagnesium particulate granularity is 10～15mm.
According to wriggling of vanadium titanium vermicular cast iron treatment process of the present invention, wherein, said nucleating agent is 75SiFe, and the granularity of said 75SiFe is 5～10mm, and the add-on of said nucleating agent is 0.6%～1.2% of a weight of molten iron.
According to wriggling of vanadium titanium vermicular cast iron treatment process of the present invention, wherein, said insulating covering agent is for gathering slag insulating covering agent or plant ash.
Embodiment 1
Present embodiment is used to prepare automobile engine cylinder head.The raw materials by weight of present embodiment is configured to following component: carbon is 3.4%, and silicon is 2.8%, and manganese is 0.9%, phosphorus 0.10%, and sulphur 0.07%, vanadium are 0.10%; Titanium is 0.10%, and surplus is iron and unavoidable impurities.Directly change 1320 ℃ of high temperature liquid irons that obtain after the vanadium titano-magnetite fusing over to intermediate frequency furnace and carry out melting, smelting temperature is 1560 ℃.Before molten iron is come out of the stove, will pour into a mould pack processing and toast, then with vermiculizer, 2/3 75SiFe with gather the slag insulating covering agent and place bag end tamping at 300 ℃; Wherein vermiculizer is the mixture of rare earth ferrosilicon (trade mark and chemical ingredients are seen table 1) and rare earth ferrosilicomagnesium (trade mark and chemical ingredients are seen table 2); Wherein rare earth ferrosilicon adding weight percent is 60%; The concrete composition of rare earth ferrosilicon and rare earth ferrosilicomagnesium is shown in table 1 and table 2, and said vermiculizer add-on is 1.8% of an iron liquid weight; Nucleating agent is 75SiFe, and add-on is 0.6% of an iron liquid weight.Rare earth ferrosilicon and rare earth ferrosilicomagnesium add with the fine particle shape, and rare earth ferrosilicon particulate granularity is 5mm, and rare earth ferrosilicomagnesium particulate granularity is 10mm.After composition chemical examination in molten iron stokehold is qualified, come out of the stove in 1480 ℃, adopt the method that pours to pour molten iron into cast pack processing wriggling processing and inoculation; Pour molten iron in the stove into the cast pack processing during wriggling processing; Pour the molten iron of pouring ladle capacity 2/3 earlier into; Treat to pour into again after stir process evenly the molten iron of pouring ladle capacity 1/3, simultaneously remaining 1/3 nucleating agent is added with stream, add afterwards and gather the slag insulating covering agent in the molten iron surface; Can be used for cast after leaving standstill 2min, teeming temperature is 1380 ℃.
For automobile engine cylinder head, there is not the practical implementation standard at present, now the market engine cylinder cover material of getting on the car mainly contains HT200, HT250 and duraluminum etc., general requirement cylinder cap body intensity is greater than 200Mpa, and hardness is greater than 180HBS.The performance of the automobile engine cylinder head of present embodiment preparation is as shown in table 3, can be known by table 3, and the performance of the automobile engine cylinder head of present embodiment preparation is far superior to the automobile engine cylinder head of other material.
The table 1 rare earth ferrosilicon alloy trade mark and chemical ingredients (carrying out) according to GB/T 4137-2004
The table 2 rare earth magnesium ferrosilicon alloy trade mark and chemical ingredients (carrying out) according to GB/T 4138-2004
Embodiment 2
Present embodiment is used to prepare automobile brake drum.The raw materials by weight of present embodiment is configured to following component: carbon is 3.7%, and silicon is 2.6%, and manganese is 0.7%, phosphorus 0.09%, and sulphur 0.05%, vanadium are 0.20%; Titanium is 0.15%, and surplus is iron and unavoidable impurities.Directly change 1330 ℃ of high temperature liquid irons that obtain after the vanadium titano-magnetite fusing over to intermediate frequency furnace and carry out melting, smelting temperature is 1530 ℃.Before molten iron is come out of the stove, will pour into a mould pack processing and toast, then with vermiculizer, 2/3 75SiFe with gather the slag insulating covering agent and place bag end tamping at 350 ℃; Wherein vermiculizer is the mixture of rare earth ferrosilicon and rare earth ferrosilicomagnesium, and wherein rare earth ferrosilicon adding weight percent is 70%, and the concrete composition of rare earth ferrosilicon and rare earth ferrosilicomagnesium is shown in table 1 and table 2, and the add-on of said vermiculizer is 1.5% of an iron liquid weight; Nucleating agent is 75SiFe, and add-on is 0.9% of an iron liquid weight.Rare earth ferrosilicon and rare earth ferrosilicomagnesium add with the fine particle shape, and rare earth ferrosilicon particulate granularity is 10mm, and rare earth ferrosilicomagnesium particulate granularity is 12mm.After composition chemical examination in molten iron stokehold is qualified, come out of the stove in 1460 ℃, adopt the method that pours to pour molten iron into cast pack processing wriggling processing and inoculation; Pour molten iron in the stove into the cast pack processing during wriggling processing; Pour the molten iron of pouring ladle capacity 2/3 earlier into; Treat to pour into again after stir process evenly the molten iron of pouring ladle capacity 1/3, simultaneously remaining 1/3 nucleating agent is added with stream, add plant ash afterwards in the molten iron surface; Can be used for cast after leaving standstill 3min, teeming temperature is 1350 ℃.The performance index of the brake drum of present embodiment preparation see table 3 for details.
For the performance index of automobile brake drum, there is not practical implementation standard (technical requirements of standard JB 531-1984 and QC/T 485-1999 regulation is all cancelled) now.The brake drum material of mentioning among the JB 531-1984 is HT15-33 (HT150), HT20-40 (HT200) and HT25-47 (HT250); Development along with automotive engineering; The material of brake drum is mainly HT250, HT300, cast alloy iron and vanadium-titanium cast iron etc. at present; Can know that according to table 3 performance of vanadium titanium vermicular cast iron brake drum obviously is superior to present common brake drum.
Embodiment 3
Present embodiment is used to prepare automobile brake disc.The raw materials by weight of embodiment 3 is configured to following component: carbon is 3.9%, and silicon is 2.1%, and manganese is 0.5%, phosphorus 0.08%, and sulphur 0.03%, vanadium are 0.35%; Titanium is 0.25%, and surplus is iron and unavoidable impurities.Directly change 1350 ℃ of high temperature liquid irons that obtain after the vanadium titano-magnetite fusing over to intermediate frequency furnace and carry out melting, smelting temperature is 1500 ℃.Before molten iron is come out of the stove, will pour into a mould pack processing and toast, then with vermiculizer, 2/3 75SiFe with gather the slag insulating covering agent and place bag end tamping at 450 ℃; Wherein vermiculizer is the mixture of rare earth ferrosilicon and rare earth ferrosilicomagnesium, and wherein rare earth ferrosilicon adding weight percent is 80%, and the concrete composition of rare earth ferrosilicon and rare earth ferrosilicomagnesium is shown in table 1 and table 2, and the add-on of said vermiculizer is 1.2% of an iron liquid weight; Nucleating agent is 75SiFe, and add-on is 1.2% of an iron liquid weight.Rare earth ferrosilicon and rare earth ferrosilicomagnesium add with the fine particle shape, and rare earth ferrosilicon particulate granularity is 8mm, and rare earth ferrosilicomagnesium particulate granularity is 15mm.After composition chemical examination in molten iron stokehold is qualified, come out of the stove in 1450 ℃, adopt the method that pours to pour molten iron into cast pack processing wriggling processing and inoculation; Pour molten iron in the stove into the cast pack processing during wriggling processing; Pour the molten iron of pouring ladle capacity 2/3 earlier into; Treat to pour into again after stir process evenly the molten iron of pouring ladle capacity 1/3, simultaneously remaining 1/3 nucleating agent is added with stream, add afterwards and gather the slag insulating covering agent in the molten iron surface; Can be used for cast after leaving standstill 3min, teeming temperature is 1340 ℃.
For automobile brake disc, there is not the practical implementation standard at present.The main raw of using in the market is HT250 and cast alloy iron, and its tensile strength is 250Mpa～300Mpa, and hardness value is 200HBS～250HBS, and elongation is lower than 1%, and thermal fatigue and wear resistance are relatively poor.With reference to train braking dish standard TB/T 2980-2000 regulation, the train braking dish adopts RuT300 or HT300 to make, and its concrete mechanical performance index is as shown in table 4.Retarding disc performance of products index with the present embodiment preparation sees table 3 for details.Can know that according to table 3 and table 4 tensile strength of vanadium titanium vermicular cast iron retarding disc and hardness have arrived the standard of train braking dish among the TB/T2980-2000.Therefore, it is very superior to make the automobile brake disc performance with the vanadium titanium vermicular cast iron among the present invention, considerably beyond automobile brake disc in the market.
The performance of products index of table 3 embodiment 1-3 preparation
The train braking disk material and the mechanical property of table 4 standard JB/T 2980-2000 regulation
The hardness MV of the product of embodiment 1-3 preparation is 225～273HBW, and tensile strength MV is 364～422MPa, and the nodulizing rate of each embodiment is all more than 70%, and the content of pearlite in alloy in the matrix is all more than 60%, and perlite is the shred shape.Each item index all satisfies various products should reach performance index requirement and needs of production.Compare with the above-mentioned various products that prior art is produced; The product of producing according to the inventive method has the high characteristics of comprehensive mechanical property such as intensity, hardness and elongation; A large amount of addings of alloying element have been avoided; Reduced the secondary smelting process in the traditional mode of production mode, production cost is low, has a extensive future.
The invention is not restricted to the foregoing description, without departing from the present invention, can carry out various distortion and modification.
Claims (5)
1. wriggling of vanadium titanium vermicular cast iron treatment process is characterized in that may further comprise the steps:
A prepares raw material, and raw materials by weight is configured to following component: carbon is 3.4～3.9%, and silicon is 2.1～2.8%; Manganese is 0.5～0.9%, phosphorus≤0.10%, sulphur≤0.07%; Vanadium is 0.10～0.35%, and titanium is 0.10～0.25%, and surplus is iron and unavoidable impurities;
1320 ℃～1350 ℃ high temperature liquid irons that b obtains vanadium titano-magnetite fusing back directly change intermediate frequency furnace over to and carry out melting, and smelting temperature is greater than 1500 ℃;
Before the above-mentioned molten iron of c is come out of the stove, will pour into a mould pack processing and toast, then vermiculizer, 2/3 nucleating agent and insulating covering agent placed bag end tamping at 300 ℃～450 ℃;
After composition chemical examination in the above-mentioned molten iron of d stokehold is qualified, come out of the stove in 1450 ℃～1480 ℃, adopt the method that pours to pour molten iron into cast pack processing wriggling processing and inoculation;
Pour molten iron in the stove into the cast pack processing during processing of wriggling of e; Pour the molten iron of pouring ladle capacity 2/3 earlier into, treat to pour into again after stir process evenly the molten iron of pouring ladle capacity 1/3, simultaneously remaining 1/3 nucleating agent is added with stream; Add insulating covering agent afterwards in the molten iron surface; Can be used for cast after leaving standstill 2-3min, teeming temperature is 1340 ℃～1380 ℃
Wherein, said vermiculizer is the mixture of rare earth ferrosilicomagnesium and rare earth ferrosilicon, and wherein the weight percent of rare earth ferrosilicon is 60%～80%; Rare earth ferrosilicon and rare earth ferrosilicomagnesium add with the fine particle shape; Rare earth ferrosilicon particulate granularity is 5～10mm, and rare earth ferrosilicomagnesium particulate granularity is 10～15mm
Wherein, the add-on of said vermiculizer is 1.2%～1.8% of a weight of molten iron.
2. wriggling of vanadium titanium vermicular cast iron treatment process according to claim 1 it is characterized in that said nucleating agent is 75SiFe, and the add-on of said nucleating agent is 0.6%～1.2% of a weight of molten iron.
3. wriggling of vanadium titanium vermicular cast iron treatment process according to claim 1 is characterized in that said insulating covering agent is for gathering slag insulating covering agent or plant ash.
4. wriggling of vanadium titanium vermicular cast iron treatment process according to claim 2, the granularity that it is characterized in that said 75SiFe is 5～10mm.
5. wriggling of vanadium titanium vermicular cast iron treatment process according to claim 1, the smelting temperature that it is characterized in that said b step is greater than 1500 ℃ and smaller or equal to 1560 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011100090983A CN102071351B (en) | 2011-01-17 | 2011-01-17 | Vermicularizing treatment process of vanadium-titanium vermicular graphite cast iron |
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| CN2011100090983A CN102071351B (en) | 2011-01-17 | 2011-01-17 | Vermicularizing treatment process of vanadium-titanium vermicular graphite cast iron |
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| CN102676906B (en) * | 2012-06-20 | 2013-06-19 | 丹阳市锦雄机械制造有限公司 | Preparation method of compacted graphite cast iron |
| CN103266268A (en) * | 2013-05-15 | 2013-08-28 | 贵州安顺巨驰汽车配件有限责任公司 | Casting method of vehicle brake drum |
| CN103540831B (en) * | 2013-11-13 | 2015-10-28 | 中国石油集团济柴动力总厂成都压缩机厂 | The pouring procedure of natural aerodynamic cylinder |
| CN103600021B (en) * | 2013-11-13 | 2015-07-01 | 中国石油集团济柴动力总厂成都压缩机厂 | Manufacturing technology for natural aerodynamic cylinder |
| CN104060149A (en) * | 2014-07-04 | 2014-09-24 | 四川省富邦钒钛制动鼓有限公司 | Automotive V-Ti (Vanadium Titanium) cast iron brake disc and manufacturing method thereof |
| CN104357736B (en) * | 2014-11-04 | 2015-11-25 | 攀枝花市大西南实业有限公司 | A kind of vanadium titanium vermicular cast iron |
| CN104532107A (en) * | 2014-12-09 | 2015-04-22 | 四川省富邦钒钛制动鼓有限公司 | Vanadium-titanium vermicular cast iron brake drum and manufacture method thereof |
| CN107619989A (en) * | 2017-09-06 | 2018-01-23 | 广西玉柴机器股份有限公司 | The casting technique of high intensity vermicular cast iron material |
| CN108486457B (en) * | 2018-02-08 | 2019-09-27 | 东风商用车有限公司 | A kind of preparation method of vermicular cast iron brake material |
| CN108467987B (en) * | 2018-04-27 | 2020-08-14 | 成都新志实业有限公司 | Low-alloy medium-silicon vermicular graphite cast iron glass mold material and preparation method thereof |
| CN109266803A (en) * | 2018-11-02 | 2019-01-25 | 常熟市金诺精工模具有限公司 | The manufacturing method of vermicular cast iron glass ware mould material |
| CN109468524B (en) * | 2018-11-02 | 2021-03-05 | 常熟市金诺精工模具有限公司 | Method for manufacturing thermal fatigue resistant cast iron glassware mould material |
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