CN104532107A - Vanadium-titanium vermicular cast iron brake drum and manufacture method thereof - Google Patents
Vanadium-titanium vermicular cast iron brake drum and manufacture method thereof Download PDFInfo
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- CN104532107A CN104532107A CN201410746391.1A CN201410746391A CN104532107A CN 104532107 A CN104532107 A CN 104532107A CN 201410746391 A CN201410746391 A CN 201410746391A CN 104532107 A CN104532107 A CN 104532107A
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Abstract
The invention discloses a vanadium-titanium vermicular cast iron brake drum and a manufacture method thereof. The vanadium-titanium vermicular cast iron brake drum comprises the following chemical compositions in percent by weight: 3.8-4.2% of carbon, 1.8-2.2% of silicon, 0.4-0.6% of manganese, 0.15-0.34% of vanadium, 0.05-0.08% of titanium, 0.1-0.3% of chromium, 0.03-0.06% of sulfur, 0.05-0.09% of phosphorus, 0.01-0.03% of residual magnesium, and the balance iron and unavoidable impurity. The vanadium-titanium vermicular cast iron brake drum employs vanadium-containing pig iron as a raw material, is not added with other precious metal elements, and possesses the characteristics of excellent mechanical properties, good wear resistant, thermal fatigue resistance, low production cost and the like. The pearlite content in the vanadium-titanium vermicular cast iron microstructure is 70%-90%, the vermicular graphite rate is 70%-90%, the tensile strength is 410 MPa-460 MPa, and the Brinell hardness is 200 HBS-240 HBS. Vanadium-containing pig iron is utilized as the raw material and other precious metal elements are not added, therefore the production cost is reduced and the performances reach RuT450A requirements. The vanadium-titanium vermicular cast iron brake drum possesses good mechanical properties, wear resistance, vibration damping performance and thermal conductivity, is improved in service life and low in production cost, and has wide market application prospect.
Description
Technical field
The invention belongs to field of automobile, particularly relate to a kind of vanadium titanium vermicular cast iron brake drum and manufacture method thereof.
Background technology
Brake drum is the modal braking component on automobile, is also the important guarantee of ride safety of automobile.Along with the fast development of automobile industry, it is also proposed higher requirement to brake drum, brake drum is towards future developments such as high strength, high-wearing feature, high thermal fatigue resistances.The domestic and international material for brake drum mainly HT250, HT300, low-alloy grey-cast iron and vanadium titanium graphitic cast iron at present, but it generally has the features such as intensity is low, thermal fatigue resistance is poor, often occurs decrepitation in using.Low-alloy grey-cast iron usually adds Cr, Ni and Mo in producing, although tensile strength, wear resisting property, heat-resistant anti-fatigue performance make moderate progress, adding of the precious metals such as Ni and Mo, makes its production cost higher.
The tensile strength of vermicular cast iron, wear resistance are all higher than graphitic cast iron, and its thermal conductivity is close with graphitic cast iron with damping property and far above magnesium iron, both had that magnesium iron intensity is high, the feature of good toughness, there is again the features such as grey thermal conductivity is high, damping property is excellent, there is excellent heat-resistant anti-fatigue performance, be thus very suitable for producing brake drum.Therefore develop that a kind of production cost is low, the vermicular cast iron brake drum of excellent performance has important construction value and market outlook.
Summary of the invention
The object of the embodiment of the present invention is to provide a kind of vanadium titanium vermicular cast iron brake drum and manufacture method thereof, and the production cost that the material being intended to solve existing brake drum exists is higher, thermal conductivity and the poor problem of damping property.
The embodiment of the present invention is achieved in that a kind of manufacture method of vanadium titanium vermicular cast iron brake drum, and the manufacture method of this vanadium titanium vermicular cast iron brake drum comprises the following steps:
Step one, raw materials, is configured to following component by raw materials by weight: carbon is 3.8 ~ 4.2%, and silicon is 1.8 ~ 2.2%, manganese is 0.4 ~ 0.6%, vanadium is 0.15 ~ 0.34%, and titanium is 0.05 ~ 0.08%, and chromium is 0.1 ~ 0.3%, sulphur is 0.03 ~ 0.06%, phosphorus is 0.05 ~ 0.09%, and residual magnesium is 0.01 ~ 0.03%, and surplus is iron and inevitable impurity;
Step 2, melting: the foundry returns adding the carburelant of 1.2 ~ 1.8%, the pig iron containing vanadium of 60%, the steel scrap 20% of 20% in intermediate frequency furnace, the initial stage of carrying out melting, it is modified that the melting later stage adds 1.0 ~ 1.3% ferrosilicon, 0.3 ~ 0.5% ferromanganese, ferrochrome 0.1 ~ 0.2% carries out composition, then in 1530 ± 10 DEG C of Overheating Treatment 5 ~ 10min, then cooling prepares when temperature is 1450 DEG C ~ 1480 DEG C to come out of the stove;
Step 3, compactedization and breeding: adopt and pour method and carry out compactedization and inoculation, add nucleating agent, vermiculizer and insulating covering agent at the bottom of hot metal ladle, step 2 gained molten iron is poured in hot metal ladle, carry out breeding and creepage rate;
Step 4, casting: after the molten iron drossing after step 3 compactedization and inoculation, treat that temperature becomes 1350 DEG C ~ 1390 DEG C and namely can be used for cast, be poured in the sandbox of brake drum, every iron clad water casting complete time controling is within 12min;
Step 5, after being cooled by the brake drum that step 4 is poured into a mould, takes out, adds through ball blast, polishing, machine, obtain vanadium titanium vermicular cast iron brake drum in sandbox.
Further, in 1530 ± 10 DEG C of Overheating Treatment 5 ~ 10min in step one melting, iron liquid has been purified.
Further, vermiculizer is rare earth ferrosilicomagnesium, and granularity is 10 ~ 20mm, and add-on is 0.45% ~ 0.75% of iron liquid weight.
Further, nucleating agent is 75SiFe, and granularity is 5 ~ 10mm, and add-on is 0.4% ~ 0.8% of iron liquid weight.
Further, insulating covering agent is common cold-rolled steel sheet.
Further, this vanadium titanium vermicular cast iron brake drum, content of pearlite in alloy is between 70% ~ 90%, between nodulizing rate 70% ~ 90%; Tensile strength is between 410MPa ~ 460MPa, and Brinell hardness is between 200HBS ~ 240HBS.
Further, the manufacture method of this vanadium titanium vermicular cast iron brake drum comprises: the foundry returns adding the carburelant of 1.2%, the pig iron containing vanadium of 60%, the steel scrap 20% of 20% in intermediate frequency furnace, the initial stage of carrying out melting, it is modified that the melting later stage adds 1.0% ferrosilicon, 0.3% ferromanganese, ferrochrome 0.1% carries out composition, then in 1520 DEG C of Overheating Treatment 5min, then cooling prepares when temperature is 1450 DEG C to come out of the stove; After hot metal ladle has been toasted, add iron liquid weight 0.4%75SiFe nucleating agent successively, granularity is 5 ~ 10mm, 0.45% rare earth ferrosilicomagnesium vermiculizer of iron liquid weight, granularity is 10 ~ 20mm, finally common cold-rolled steel sheet is covered in above nucleating agent, the molten iron of 1450 DEG C is poured in hot metal ladle, carry out compactedization and inoculation, then skim, when temperature is 1350 DEG C, molten iron is poured in brake drum sandbox, treat that temperature is cooled to 200 DEG C and is taken out from sandbox by brake drum, add through ball blast, polishing, machine, obtain vanadium titanium vermicular cast iron brake drum.
Further, the manufacture method of this vanadium titanium vermicular cast iron brake drum comprises: the foundry returns adding the carburelant of 1.8%, the pig iron containing vanadium of 60%, the steel scrap 20% of 20% in intermediate frequency furnace, the initial stage of carrying out melting, it is modified that the melting later stage adds 1.3% ferrosilicon, 0.5% ferromanganese, ferrochrome 0.2% carries out composition, then in 1540 DEG C of Overheating Treatment 10min, then cooling prepares when temperature is 1480 DEG C to come out of the stove; After hot metal ladle has been toasted, add iron liquid weight 0.8%75SiFe nucleating agent successively, granularity is 5 ~ 10mm, 0.75% rare earth ferrosilicomagnesium vermiculizer of iron liquid weight, granularity is 10 ~ 20mm, finally common cold-rolled steel sheet is covered in above nucleating agent, the molten iron of 1480 DEG C is poured in hot metal ladle, carry out compactedization and inoculation, then skim, when temperature is 1380 DEG C, molten iron is poured in brake drum sandbox, treat that temperature is cooled to 200 DEG C and is taken out from sandbox by brake drum, add through ball blast, polishing, machine, obtain vanadium titanium vermicular cast iron brake drum.
Further, the manufacture method of this vanadium titanium vermicular cast iron brake drum comprises: the foundry returns adding the carburelant of 1.5%, the pig iron containing vanadium of 60%, the steel scrap 20% of 20% in intermediate frequency furnace, the initial stage of carrying out melting, it is modified that the melting later stage adds 1.2% ferrosilicon, 0.4% ferromanganese, ferrochrome 0.15% carries out composition, then in 1530 DEG C of Overheating Treatment 8min, then cooling prepares when temperature is 1465 DEG C to come out of the stove; After hot metal ladle has been toasted, add iron liquid weight 0.6%75SiFe nucleating agent successively, granularity is 5 ~ 10mm, 0.6% rare earth ferrosilicomagnesium vermiculizer of iron liquid weight, granularity is 10 ~ 20mm, finally common cold-rolled steel sheet is covered in above nucleating agent, the molten iron of 1465 DEG C is poured in hot metal ladle, carry out compactedization and inoculation, then skim, when temperature is 13650 DEG C, molten iron is poured in brake drum sandbox, treat that temperature is cooled to 200 DEG C and is taken out from sandbox by brake drum, add through ball blast, polishing, machine, obtain vanadium titanium vermicular cast iron brake drum.
Another object of the embodiment of the present invention is to provide a kind of vanadium titanium vermicular cast iron brake drum, the chemical constitution of this vanadium titanium vermicular cast iron brake drum is by weight percentage: carbon is 3.8 ~ 4.2%, silicon is 1.8 ~ 2.2%, and manganese is 0.4 ~ 0.6%, and vanadium is 0.15 ~ 0.34%, titanium is 0.05 ~ 0.08%, chromium is 0.1 ~ 0.3%, and sulphur is 0.03 ~ 0.06%, and phosphorus is 0.05 ~ 0.09%, residual magnesium is 0.01 ~ 0.03%, and surplus is iron and inevitable impurity; Carbon equivalent ce is 4.4 ~ 4.9, wherein, and CE=C+1/3 (Si+P).
Vanadium titanium vermicular cast iron brake drum provided by the invention and manufacture method thereof, take pig iron containing vanadium as raw material, do not add other precious metal elements, has excellent mechanical property, good wear resistance and thermal fatigue resistance and the feature such as production cost is low.Vanadium titanium vermicular cast iron metallographic structure Medium pearlite content of the present invention is between 70% ~ 90%, between nodulizing rate 70% ~ 90%; Tensile strength is between 410MPa ~ 460MPa, and Brinell hardness is between 200HBS ~ 240HBS; Utilize pig iron containing vanadium thus to reduce production cost for raw material does not add other noble metals, and its performance reach the requirement of RuT450A.This vanadium titanium vermicular cast iron brake drum has good mechanical property, wear resisting property, damping property and heat conductivility, the work-ing life of larger raising brake drum, and production cost is low, has wide market application foreground.
Accompanying drawing explanation
Fig. 1 is the manufacture method schema of the vanadium titanium vermicular cast iron brake drum that the embodiment of the present invention provides.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Below in conjunction with drawings and the specific embodiments, application principle of the present invention is further described.
The chemical constitution of the vanadium titanium vermicular cast iron brake drum of the embodiment of the present invention is by weight percentage: carbon is 3.8 ~ 4.2%, silicon is 1.8 ~ 2.2%, manganese is 0.4 ~ 0.6%, vanadium is 0.15 ~ 0.34%, and titanium is 0.05 ~ 0.08%, and chromium is 0.1 ~ 0.3%, sulphur is 0.03 ~ 0.06%, phosphorus is 0.05 ~ 0.09%, and residual magnesium is 0.01 ~ 0.03%, and surplus is iron and inevitable impurity.Its carbon equivalent ce is 4.4 ~ 4.9, wherein, and CE=C+1/3 (Si+P).
As shown in Figure 1, the manufacture method of the vanadium titanium vermicular cast iron brake drum of the embodiment of the present invention comprises the following steps:
S101: raw materials, raw materials by weight is configured to following component: carbon is 3.8 ~ 4.2%, silicon is 1.8 ~ 2.2%, and manganese is 0.4 ~ 0.6%, and vanadium is 0.15 ~ 0.34%, titanium is 0.05 ~ 0.08%, chromium is 0.1 ~ 0.3%, and sulphur is 0.03 ~ 0.06%, and phosphorus is 0.05 ~ 0.09%, residual magnesium is 0.01 ~ 0.03%, and surplus is iron and inevitable impurity;
S102: melting: the foundry returns adding the carburelant of 1.2 ~ 1.8%, the pig iron containing vanadium of 60%, the steel scrap 20% of 20% in intermediate frequency furnace, the initial stage of carrying out melting, it is modified that the melting later stage adds 1.0 ~ 1.3% ferrosilicon, 0.3 ~ 0.5% ferromanganese, ferrochrome 0.1 ~ 0.2% carries out composition, then in 1530 ± 10 DEG C of Overheating Treatment 5 ~ 10min, then cooling prepares when temperature is 1450 DEG C ~ 1480 DEG C to come out of the stove;
S103: compactedization and breeding: adopt and pour method and carry out compactedization and inoculation, add nucleating agent, vermiculizer and insulating covering agent at the bottom of hot metal ladle, S102 gained molten iron is poured in hot metal ladle, carry out breeding and creepage rate;
S104: casting: after the molten iron drossing after S103 compactedization and inoculation, treat that temperature becomes 1350 DEG C ~ 1390 DEG C and namely can be used for cast, be poured in the sandbox of brake drum, every iron clad water casting complete time controling is within 12min;
S105: after the brake drum that S104 pours into a mould is cooled in sandbox, take out, add through ball blast, polishing, machine, obtain vanadium titanium vermicular cast iron brake drum.
In 1530 ± 10 DEG C of Overheating Treatment 5 ~ 10min in step S101 melting, purify iron liquid.
Vermiculizer is rare earth ferrosilicomagnesium, and granularity is 10 ~ 20mm, and add-on is 0.45% ~ 0.75% of iron liquid weight.
Nucleating agent is 75SiFe, and granularity is 5 ~ 10mm, and add-on is 0.4% ~ 0.8% of iron liquid weight.
Insulating covering agent is common cold-rolled steel sheet.
This vanadium titanium vermicular cast iron brake drum, its content of pearlite in alloy is between 70% ~ 90%, between nodulizing rate 70% ~ 90%; Tensile strength is between 410MPa ~ 460MPa, and Brinell hardness is between 200HBS ~ 240HBS, as shown in the table:
Test block Y25mm mechanical property and nodulizing rate assay is watered outside this stove:
Principle of work of the present invention: C and Si in vanadium titanium vermicular cast iron brake drum of the present invention promotes graphited element; C and Si is higher, and in vermicular cast iron, degree of graphitization is higher, and thermal conductivity is better; But C and Si content is too high, will causes that graphite is thick, matrix content of pearlite in alloy will be not enough, and then intensity hardness is reduced; In vanadium titanium vermicular cast iron of the present invention, carbon equivalent ce is 4.4 ~ 4.9, carbon content is between 3.8 ~ 4.2%, molten iron has good mobility, thus there is good castability, silicone content is between 1.8 ~ 2.2%, and silicon is the graphited element of strong promotion, prevents the appearance of spoken parts in traditional operas, silicon is too low, easily occurs spoken parts in traditional operas, and too high then ferrite content high content of pearlite in alloy is very few;
Vanadium and titanium can form the carbonitride of extreme hardness, and Dispersed precipitate, in matrix, improves the intensity of vermicular cast iron, wear resistance and thermal fatigue resistance; Vanadium can also play refinement and strengthen pearlitic effect, improves its mechanical property, and in vanadium titanium vermicular cast iron of the present invention, content of vanadium is between 0.15 ~ 0.34%, when vanadium is too low, proposes high performance effect little, too high levels, then increases chilling tendency; Titanium belongs to interference element, can suitably widen compactedization scope, be conducive to creepage rate, in vanadium titanium vermicular cast iron of the present invention, the content of titanium is between 0.05 ~ 0.08%, and content is too low, the DeGrain that raising intensity, wear resistance aspect play, simultaneously also unfavorable to compactedization, during too high levels, make vermicular cast iron much higher hard, be unfavorable for processing, make compactedization reduce simultaneously;
Manganese is solid-solution in ferrite in vermicular cast iron, the effect of main stabilization and refine pearlite, there is no impact to graphite compactedization within the specific limits, and in vanadium titanium vermicular cast iron of the present invention, Fe content is 0.4 ~ 0.7%, when content is too low, content of pearlite in alloy is too low, makes mechanical property too low; When content is too high, chilling tendency strengthens;
Chromium is solid-solution in refinement in ferrite, strengthening perlite in vermicular cast iron, chromium is all hinder graphited element at eutectic and eutectoid stage, can refinement graphite, stabilizing pearlite, vanadium titanium vermicular cast iron chromium content of the present invention is 0.1 ~ 0.3%, when content is too low, the content of pearlite in alloy of matrix is not enough, and too high levels then produces chilling tendency;
On the crystal boundary of vermicular cast iron matrix, form iron phosphide eutectic during phosphorus content height, reduce toughness, increase fragility, therefore phosphorus belongs to harmful element; But the iron phosphide eutectic Dispersed precipitate that the phosphorus of certain content is formed, be conducive to improving hardness and wear resistance, vanadium titanium vermicular cast iron phosphorus content of the present invention is 0.05 ~ 0.09%;
Sulphur and so compactedization element has strong avidity, belongs to anti-compactedization element, when sulphur content is greater than 0.03% in vermicular cast iron, first vermiculizer reacts with the oxygen in sulphur and iron liquid, a large amount of consumption vermiculizer, causes sulfide inclusion simultaneously, and remaining vermiculizer just plays and compactedly turns use into; Iron molten sulfur content is higher, and consume vermiculizer more, the sulfide inclusion of formation is also more, also compromises the performance of material while cost is improved; The same with all anti-compactedization elements, sulphur can widen the scope that vermiculizer adds, and compactedization is stablized; Vanadium titanium vermicular cast iron sulphur content of the present invention is 0.03 ~ 0.06%.
Below in conjunction with embodiment, the specific embodiment of the present invention is further described, therefore the present invention is not limited within described embodiment;
Embodiment one
The foundry returns of the carburelant of 1.2%, the pig iron containing vanadium of 60%, the steel scrap 20% of 20% is added in intermediate frequency furnace, the initial stage of carrying out melting, it is modified that the melting later stage adds 1.0% ferrosilicon, 0.3% ferromanganese, ferrochrome 0.1% carries out composition, then in 1520 DEG C of Overheating Treatment 5min, then cooling prepares when temperature is 1450 DEG C to come out of the stove, after hot metal ladle has been toasted, add iron liquid weight 0.4%75SiFe nucleating agent successively, granularity is 5 ~ 10mm, 0.45% rare earth ferrosilicomagnesium vermiculizer of iron liquid weight, granularity is 10 ~ 20mm, finally common cold-rolled steel sheet is covered in above nucleating agent, the molten iron of 1450 DEG C is poured in hot metal ladle, carry out compactedization and inoculation, then skim, molten iron is poured in brake drum sandbox when temperature is 1350 DEG C, treat that temperature is cooled to about 200 DEG C and is taken out from sandbox by brake drum, through ball blast, polishing, machine adds, obtain vanadium titanium vermicular cast iron brake drum, the composition of this brake drum and performance are respectively in table 1 and table 2,
Embodiment two
The foundry returns of the carburelant of 1.8%, the pig iron containing vanadium of 60%, the steel scrap 20% of 20% is added in intermediate frequency furnace, the initial stage of carrying out melting, it is modified that the melting later stage adds 1.3% ferrosilicon, 0.5% ferromanganese, ferrochrome 0.2% carries out composition, then in 1540 DEG C of Overheating Treatment 10min, then cooling prepares when temperature is 1480 DEG C to come out of the stove, after hot metal ladle has been toasted, add iron liquid weight 0.8%75SiFe nucleating agent successively, granularity is 5 ~ 10mm, 0.75% rare earth ferrosilicomagnesium vermiculizer of iron liquid weight, granularity is 10 ~ 20mm, finally common cold-rolled steel sheet is covered in above nucleating agent, the molten iron of 1480 DEG C is poured in hot metal ladle, carry out compactedization and inoculation, then skim, molten iron is poured in brake drum sandbox when temperature is 1380 DEG C, treat that temperature is cooled to about 200 DEG C and is taken out from sandbox by brake drum, through ball blast, polishing, machine adds, obtain vanadium titanium vermicular cast iron brake drum, the composition of this brake drum and performance are respectively in table 1 and table 2,
Embodiment three
The foundry returns of the carburelant of 1.5%, the pig iron containing vanadium of 60%, the steel scrap 20% of 20% is added in intermediate frequency furnace, the initial stage of carrying out melting, it is modified that the melting later stage adds 1.2% ferrosilicon, 0.4% ferromanganese, ferrochrome 0.15% carries out composition, then in 1530 DEG C of Overheating Treatment 8min, then cooling prepares when temperature is 1465 DEG C to come out of the stove, after hot metal ladle has been toasted, add iron liquid weight 0.6%75SiFe nucleating agent successively, granularity is 5 ~ 10mm, 0.6% rare earth ferrosilicomagnesium vermiculizer of iron liquid weight, granularity is 10 ~ 20mm, finally common cold-rolled steel sheet is covered in above nucleating agent, the molten iron of 1465 DEG C is poured in hot metal ladle, carry out compactedization and inoculation, then skim, molten iron is poured in brake drum sandbox when temperature is 13650 DEG C, treat that temperature is cooled to about 200 DEG C and is taken out from sandbox by brake drum, through ball blast, polishing, machine adds, obtain vanadium titanium vermicular cast iron brake drum, the composition of this brake drum and performance are respectively in table 1 and table 2.
The chemical composition of three groups, table 1 test
The mechanical property of three groups, table 2 test and metallographic structure
Vanadium titanium vermicular cast iron metallographic structure Medium pearlite content of the present invention is between 70% ~ 90%, between nodulizing rate 70% ~ 90%; Tensile strength is between 410MPa ~ 460MPa, and Brinell hardness is between 200HBS ~ 240HBS; Utilize pig iron containing vanadium thus to reduce production cost for raw material does not add other noble metals, and its performance reach the requirement of RuT450A.This vanadium titanium vermicular cast iron brake drum has good mechanical property, wear resisting property, damping property and heat conductivility, the work-ing life of larger raising brake drum, and production cost is low, has wide market application foreground.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a manufacture method for vanadium titanium vermicular cast iron brake drum, is characterized in that, the manufacture method of this vanadium titanium vermicular cast iron brake drum comprises the following steps:
Step one, raw materials, is configured to following component by raw materials by weight: carbon is 3.8 ~ 4.2%, and silicon is 1.8 ~ 2.2%, manganese is 0.4 ~ 0.6%, vanadium is 0.15 ~ 0.34%, and titanium is 0.05 ~ 0.08%, and chromium is 0.1 ~ 0.3%, sulphur is 0.03 ~ 0.06%, phosphorus is 0.05 ~ 0.09%, and residual magnesium is 0.01 ~ 0.03%, and surplus is iron and inevitable impurity;
Step 2, melting: the foundry returns adding the carburelant of 1.2 ~ 1.8%, the pig iron containing vanadium of 60%, the steel scrap 20% of 20% in intermediate frequency furnace, the initial stage of carrying out melting, it is modified that the melting later stage adds 1.0 ~ 1.3% ferrosilicon, 0.3 ~ 0.5% ferromanganese, ferrochrome 0.1 ~ 0.2% carries out composition, then in 1530 ± 10 DEG C of Overheating Treatment 5 ~ 10min, then cooling prepares when temperature is 1450 DEG C ~ 1480 DEG C to come out of the stove;
Step 3, compactedization and breeding: adopt and pour method and carry out compactedization and inoculation, add nucleating agent, vermiculizer and insulating covering agent at the bottom of hot metal ladle, step 2 gained molten iron is poured in hot metal ladle, carry out breeding and creepage rate;
Step 4, casting: after the molten iron drossing after step 3 compactedization and inoculation, treat that temperature becomes 1350 DEG C ~ 1390 DEG C and namely can be used for cast, be poured in the sandbox of brake drum, every iron clad water casting complete time controling is within 12min;
Step 5, after being cooled by the brake drum that step 4 is poured into a mould, takes out, adds through ball blast, polishing, machine, obtain vanadium titanium vermicular cast iron brake drum in sandbox.
2. the manufacture method of vanadium titanium vermicular cast iron brake drum as claimed in claim 1, is characterized in that, in 1530 ± 10 DEG C of Overheating Treatment 5 ~ 10min in step one melting, purified iron liquid.
3. the manufacture method of vanadium titanium vermicular cast iron brake drum as claimed in claim 1, it is characterized in that, vermiculizer is rare earth ferrosilicomagnesium, and granularity is 10 ~ 20mm, and add-on is 0.45% ~ 0.75% of iron liquid weight.
4. the manufacture method of vanadium titanium vermicular cast iron brake drum as claimed in claim 1, it is characterized in that, nucleating agent is 75SiFe, and granularity is 5 ~ 10mm, and add-on is 0.4% ~ 0.8% of iron liquid weight.
5. the manufacture method of vanadium titanium vermicular cast iron brake drum as claimed in claim 1, it is characterized in that, insulating covering agent is common cold-rolled steel sheet.
6. the manufacture method of vanadium titanium vermicular cast iron brake drum as claimed in claim 1, it is characterized in that, this vanadium titanium vermicular cast iron brake drum, content of pearlite in alloy is between 70% ~ 90%, between nodulizing rate 70% ~ 90%; Tensile strength is between 410MPa ~ 460MPa, and Brinell hardness is between 200HBS ~ 240HBS.
7. the manufacture method of vanadium titanium vermicular cast iron brake drum as claimed in claim 1, it is characterized in that, the manufacture method of this vanadium titanium vermicular cast iron brake drum comprises: the foundry returns adding the carburelant of 1.2%, the pig iron containing vanadium of 60%, the steel scrap 20% of 20% in intermediate frequency furnace, the initial stage of carrying out melting, it is modified that the melting later stage adds 1.0% ferrosilicon, 0.3% ferromanganese, ferrochrome 0.1% carries out composition, then in 1520 DEG C of Overheating Treatment 5min, then cooling prepares when temperature is 1450 DEG C to come out of the stove; After hot metal ladle has been toasted, add iron liquid weight 0.4%75SiFe nucleating agent successively, granularity is 5 ~ 10mm, 0.45% rare earth ferrosilicomagnesium vermiculizer of iron liquid weight, granularity is 10 ~ 20mm, finally common cold-rolled steel sheet is covered in above nucleating agent, the molten iron of 1450 DEG C is poured in hot metal ladle, carry out compactedization and inoculation, then skim, when temperature is 1350 DEG C, molten iron is poured in brake drum sandbox, treat that temperature is cooled to 200 DEG C and is taken out from sandbox by brake drum, add through ball blast, polishing, machine, obtain vanadium titanium vermicular cast iron brake drum.
8. the manufacture method of vanadium titanium vermicular cast iron brake drum as claimed in claim 1, it is characterized in that, the manufacture method of this vanadium titanium vermicular cast iron brake drum comprises: the foundry returns adding the carburelant of 1.8%, the pig iron containing vanadium of 60%, the steel scrap 20% of 20% in intermediate frequency furnace, the initial stage of carrying out melting, it is modified that the melting later stage adds 1.3% ferrosilicon, 0.5% ferromanganese, ferrochrome 0.2% carries out composition, then in 1540 DEG C of Overheating Treatment 10min, then cooling prepares when temperature is 1480 DEG C to come out of the stove; After hot metal ladle has been toasted, add iron liquid weight 0.8%75SiFe nucleating agent successively, granularity is 5 ~ 10mm, 0.75% rare earth ferrosilicomagnesium vermiculizer of iron liquid weight, granularity is 10 ~ 20mm, finally common cold-rolled steel sheet is covered in above nucleating agent, the molten iron of 1480 DEG C is poured in hot metal ladle, carry out compactedization and inoculation, then skim, when temperature is 1380 DEG C, molten iron is poured in brake drum sandbox, treat that temperature is cooled to 200 DEG C and is taken out from sandbox by brake drum, add through ball blast, polishing, machine, obtain vanadium titanium vermicular cast iron brake drum.
9. the manufacture method of vanadium titanium vermicular cast iron brake drum as claimed in claim 1, it is characterized in that, the manufacture method of this vanadium titanium vermicular cast iron brake drum comprises: the foundry returns adding the carburelant of 1.5%, the pig iron containing vanadium of 60%, the steel scrap 20% of 20% in intermediate frequency furnace, the initial stage of carrying out melting, it is modified that the melting later stage adds 1.2% ferrosilicon, 0.4% ferromanganese, ferrochrome 0.15% carries out composition, then in 1530 DEG C of Overheating Treatment 8min, then cooling prepares when temperature is 1465 DEG C to come out of the stove; After hot metal ladle has been toasted, add iron liquid weight 0.6%75SiFe nucleating agent successively, granularity is 5 ~ 10mm, 0.6% rare earth ferrosilicomagnesium vermiculizer of iron liquid weight, granularity is 10 ~ 20mm, finally common cold-rolled steel sheet is covered in above nucleating agent, the molten iron of 1465 DEG C is poured in hot metal ladle, carry out compactedization and inoculation, then skim, when temperature is 13650 DEG C, molten iron is poured in brake drum sandbox, treat that temperature is cooled to 200 DEG C and is taken out from sandbox by brake drum, add through ball blast, polishing, machine, obtain vanadium titanium vermicular cast iron brake drum.
10. a vanadium titanium vermicular cast iron brake drum, it is characterized in that, the chemical constitution of this vanadium titanium vermicular cast iron brake drum is by weight percentage: carbon is 3.8 ~ 4.2%, and silicon is 1.8 ~ 2.2%, manganese is 0.4 ~ 0.6%, vanadium is 0.15 ~ 0.34%, and titanium is 0.05 ~ 0.08%, and chromium is 0.1 ~ 0.3%, sulphur is 0.03 ~ 0.06%, phosphorus is 0.05 ~ 0.09%, and residual magnesium is 0.01 ~ 0.03%, and surplus is iron and inevitable impurity; Carbon equivalent ce is 4.4 ~ 4.9, wherein, and CE=C+1/3 (Si+P).
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| CN111621693A (en) * | 2020-07-17 | 2020-09-04 | 四川赢信汇通实业有限公司 | Molybdenum-titanium alloy brake drum and preparation method thereof |
| CN113106184A (en) * | 2021-03-29 | 2021-07-13 | 宜昌船舶柴油机有限公司 | Casting method of high-carbon low-silicon titanium-free vermicular graphite cast iron material |
| CN113584374A (en) * | 2021-07-16 | 2021-11-02 | 四川大学 | High-strength and high-wear-resistance vanadium-titanium cast iron brake drum |
| CN114196794A (en) * | 2021-12-20 | 2022-03-18 | 烟台宏田汽车零部件股份有限公司 | Smelting process and application of vermicular cast iron with ultrahigh vermicular rate |
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| CN113584374A (en) * | 2021-07-16 | 2021-11-02 | 四川大学 | High-strength and high-wear-resistance vanadium-titanium cast iron brake drum |
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