CN105401066A - Low-tin-silicon-molybdenum vermicular graphite cast iron and preparation method thereof - Google Patents
Low-tin-silicon-molybdenum vermicular graphite cast iron and preparation method thereof Download PDFInfo
- Publication number
- CN105401066A CN105401066A CN201510843800.4A CN201510843800A CN105401066A CN 105401066 A CN105401066 A CN 105401066A CN 201510843800 A CN201510843800 A CN 201510843800A CN 105401066 A CN105401066 A CN 105401066A
- Authority
- CN
- China
- Prior art keywords
- iron
- silicon
- cast iron
- tin
- molybdenum
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention discloses low-tin-silicon-molybdenum vermicular graphite cast iron which comprises the following components in percentage by weight: 3.4-3.8% of carbon, 2.1-2.6% of silicon, 0.1-0.3% of molybdenum, 0.2-0.3% of manganese, 0.2-0.3% of niobium, 0.1-0.2% of chromium, 0.01-0.03% of tin, 0.01-0.028% of stibium, 0.1-0.18% of vanadium, 0.15-0.25% of titanium, 0.06% or less (total content) of phosphorus and sulphur, and iron and inevitable impurities in balancing amount. The low-tin-silicon-molybdenum vermicular graphite cast iron provided by the invention has small chilling tendency, and the length and thickness of vermicular graphite are small so that the low-tin-silicon-molybdenum vermicular graphite cast iron has excellent strength, wear resistance property and thermal fatigue resistance property. Meanwhile, the invention also provides a method for preparing the low-tin-silicon-molybdenum vermicular graphite cast iron. The low-tin-silicon-molybdenum vermicular graphite cast iron prepared according to the method has a high vermicular graphite rate and good comprehensive properties; the technological operation process is simple; and the low-tin-silicon-molybdenum vermicular graphite cast iron is suitable for mass production.
Description
Technical field
The present invention relates to material field of metallurgy, particularly one low tin silicon molybdenum vermicular cast iron and preparation method thereof.
Background technology
Modern diesel engine volume power is high, compact construction, cast shape complicated, thermal load is large, reinforcing degree high, not only to its designing technique, and new higher requirement be it is also proposed to the material of the important Parts such as diesel-engine body, cylinder head and manufacturing technology, require that material had both had high room temperature and mechanical behavior under high temperature, excellent heat conduction damping performance and excellent thermal fatigue property, require that there is very high compactness, homogeneity and reliability again.Graphite form in cast iron has sheet, vermiform and spherical, and quasiflake graphite is a kind of intermediary graphite between flake graphite and globular graphite, and during optical microphotograph Microscopic observation, in visual field, major part is mutual discontinuous graphite short-movie.With scanning electron microscopic observation after deep erosions, can see that they are interconnection in eutectic cell inside.This point is similar with flake graphite, and the slenderness ratio unlike vermicular cast iron is less, and density is high.Meanwhile, can see that under scanning electron microscope the end of vermicular cast iron is comparatively round blunt, what have is just ball-like structure, and globular graphite is quite similar.Vermicular cast iron has very excellent room temperature and mechanical behavior under high temperature, excellent thermal fatigue resistance and wear resisting property, good cast form performance, becomes the ideal material of the key components such as the body of superpower diesel engine, cylinder head gradually.
Traditional vermicular cast iron due to the reasons such as nodulizing rate on the low side and over-all properties difference serious hinder its promotion and application.Although, in vermicular cast iron, done a large amount of work both at home and abroad, achieved many achievements, but this material is industrially applied in process and encountered an a lot of difficult problem, creepage rate is unstable in the preparation, nodulizing rate is on the low side and more difficult control to be mainly manifested in this material, and over-all properties is poor.
Summary of the invention
Goal of the invention of the present invention is: for above-mentioned Problems existing, a kind of low tin silicon molybdenum vermicular cast iron is provided, described low tin silicon molybdenum vermicular cast iron chilling tendency is little, and the slenderness ratio of quasiflake graphite is less, and the intensity of low tin silicon molybdenum vermicular cast iron, wear resisting property and thermal fatigue resistance are excellent.Meanwhile, also provide a kind of method preparing above-mentioned low tin silicon molybdenum vermicular cast iron, make to obtain vermicular cast iron nodulizing rate high, good combination property, operational process of craft is simple, is suitable for industrialization scale operation.
The technical solution used in the present invention is as follows: a kind of low tin silicon molybdenum vermicular cast iron, and described low tin silicon molybdenum vermicular cast iron is become to be grouped into by following by weight percentage: carbon is 3.4-3.8%, and silicon is 2.1-2.6%, molybdenum is 0.1-0.3%, manganese is 0.2-0.3%, and niobium is 0.2-0.3%, and chromium is 0.1-0.2%, tin is 0.01-0.03%, antimony is 0.01-028%, and vanadium is 0.1-0.18%, and titanium is 0.15-0.25%, the total content of p and s is no more than 0.06%, and surplus is iron and inevitable impurity thereof.
Further, described low tin silicon molybdenum vermicular cast iron is become to be grouped into by following by weight percentage: carbon is 3.55%, and silicon is 2.2%, molybdenum is 0.15%, manganese is 0.27%, and niobium is 0.24%, and chromium is 0.15%, tin is 0.025%, antimony is 0.023%, and vanadium is 0.14%, and titanium is 0.18%, the total content of p and s is no more than 0.06%, and surplus is iron and inevitable impurity thereof.
In the present invention is raw materials used, chromium no matter eutectic, eutectoid process all hinders greying, promotes that perlite generates, because chromium element and ferro element are body-centered cubic structure, the atomic radius of chromium atom radius and α-Fe closely, no matter under room temperature or comparatively high temps, the solubleness of chromium in α-Fe is all higher, makes the solid solution of chromium energy enter in iron-based body, displacement ferro element, play solution strengthening effect, chromium also can form the Fe-Cr-C compound of high rigidity complexity, plays dispersion-strengthened action to matrix; Carbon promotes graphited element, carbon content is higher, in vermicular cast iron, graphitizing process more easily carries out, in vermicular cast iron tissue, graphite is just many, in general vermicular cast iron, the content of carbon controls in the scope of 3.4-3.8%, and carbon content molten iron flow within the scope of this is good, easy feeding, shrink little, excellent castability can be obtained; Silicone content is very remarkable to matrix effect, is mainly used to prevent spoken parts in traditional operas, controls high content of pearlite in matrix.Along with silicon amount increases, matrix Medium pearlite amount reduces gradually, and ferrite content increases gradually.In order to obtain higher performance requriements, and obtain the vermicular cast iron of pearlite matrix, can suitably reduce silicon amount, consider, the silicone content in the present invention controls at 2.1-2.6%; Manganese plays stabilizing pearlite in vermicular cast iron, in conventional content on graphite compactedization without impact, therefore do not reduce the impact that manganese brings, in the present invention suddenly content within conventional content.Vanadium in raw material of the present invention and titanium can refinement effectively, stabilizing pearlite, vanadium and titanium all have high avidity with carbon, nitrogen and form the high sclerosis phase vanadium titanium carbon nitrogen compound of microhardness simultaneously, improve intensity, wear resisting property and heat-resistant anti-fatigue performance, in addition, vanadium and titanium add chilling tendency, belong to interference element and tension-active element, can suitably widen compactedization scope, be conducive to creepage rate.
In the present invention is raw materials used, antimony is one and strongly promotes pearlitic metallic element, main plaing a part strengthens cast iron engine block tissue, crystal grain thinning, in order to improve hardness and the wear resistance of cast iron, consult data to show, when the content of antimony is more than 0.07%, can there is metamorphosis in compacted ink, there will be decomposition, tiny branch around.The antimony element simultaneously added can also and phosphorus form the eutectic of low melting point, finally separate out between eutectic cell, form the iron phosphide eutectic tissue containing antimony, the perlite that antimony metal is formed, vanadium titanium particle and steadite can be stablized, hardness and wear resistance are significantly improved, therefore suitably can improve the content of phosphorus for wearing piece; Adding tin in vermicular cast iron is wear resistance in order to improve vermicular cast iron, contribute to the raising of vermicular cast iron heat-resistant anti-fatigue performance, improve resistance to be full of cracks and the resistance to cracking energy of vermicular cast iron, because tin makes Graphite in Cast Iron refinement, quantity reduces, and stable also refine pearlite, makes layer reduce, serve the effect of pinning dislocation, and then improve wear resisting property; Niobium is active element, and it and carbon have extremely strong avidity, hinder greying, if but addition is suitable time, the inclusion that niobium and carbon, nitrogen, sulphur oxygen etc. form in vermicular cast iron can become graphite nuclei, and therefore niobium plays a driving role to greying; Rare earth is all strong alterant element for iron liquid, have very strong in and the ability of interference element, rare earth to join in iron liquid first with the element reactions such as sulphur, iron liquid is purified, after the purification of iron liquid, residual a small amount of rare earth just can play metamorphism to graphite, therefore the present invention adopts rare-earth, Mg, Ca vermiculizer to carry out creepage rate, and rare earth and magnesium, in wider ratio range, can obtain quasiflake graphite.
Further, the present invention also comprises a kind of preparation method of low tin silicon molybdenum vermicular cast iron, comprises the following steps:
Step 1, raw material prepare and Smelting of iron, during Smelting of iron, raw material iron is put into converter heat fused, after raw material iron all melts, regulate bath temperature, make bath temperature control at about 1400 DEG C, then in molten bath, decarburizer is added, sweetening agent, reductor, carries out decarburization, desulfurization, deoxidation to the molten iron in molten bath;
After step 2, decarburization, desulfurization, deoxidation step complete, intensification bath temperature, makes it to reach 1440 DEG C, then in molten bath, add ferrochrome and ferromanganese continuously, make the chromium content in molten bath and Fe content reach pre-provisioning request, regulate temperature, make temperature control at 1470 DEG C, keep 10min;
After step 3, step 2 complete, add reductor and carry out secondary deoxidation, add molybdenum-iron, ferro-niobium, metallic tin, vanadium iron and ferrotianium afterwards, make the alloying constituent in steel reach pre-provisioning request, then finely tune the chemical composition in molten steel;
Step 4, the CaC of iron liquid gross weight 0.55% will be accounted for
2powder is loaded in hollow T-shaped fire resisting material tube, is inserted by T-shaped pipe in iron liquid bag, makes it stir by 65rad/min speed, churning time 5min;
Step 5, cast pack processing to be toasted at 400 DEG C, then vermiculizer, nucleating agent and insulating covering agent and metallic antimony are placed in the bag end;
Step 6, step 4 is obtained iron liquid carry out alloying constituent inspection, after the assay was approved, by the method that pours, iron liquid is poured in cast pack processing, tapping temperature controls at 1470 DEG C, when tap a blast furnace liquid to bag in about 3/4 time, stopping is tapped a blast furnace, and then add and account for the rare-earth, Mg, Ca vermiculizer of iron liquid weight 0.9% and 75 silicon iron inoculator of 0.45%, iron notch pours method and breeds; After inoculation completes, the iron liquid of remaining 1/4 is poured in ladle, and stirs 5min;
After step 7, step 6 complete, adopt the perlite deslagging agent accounting for weight of molten iron 0.25% to carry out skimming 2 times, form the thick insulation tectum of 40mm with 0.3% perlite insulation insulating covering agent on molten iron surface; Prevent the effusion naturally of wrapping interior molten iron fast cooling and compactedization element;
After step 8, creepage rate, in 17min, molten iron is poured, obtains foundry goods.
Further, the foundry goods obtained also needs to heat-treat, and its thermal treatment process is: foundry goods is placed in heat treatment furnace and is heated to 920 DEG C, insulation 3h, and then the salt made from earth containing a comparatively high percentage of sodium chloride putting into 340 DEG C is incubated 2h, and last air cooling is to room temperature.
In above-mentioned preparation method, few in order to obtain defect, the low tin silicon molybdenum vermicular cast iron that composition is qualified, in order of addition(of ingredients), first add the alloying element of not easily scaling loss, as manganese and chromium etc., then add alloying element that is rare and easily scaling loss, ensure that these elements fully can be absorbed by iron liquid, and can not be removed outside iron liquid by evaporation; By stirring iron liquid with T-shaped pipe, be conducive to the effusion of obnoxious flavour in iron liquid on the one hand, make alloying elements distribution in iron liquid on the other hand evenly, the iron liquid better quality of melting, ensures that fusion process is without phenomenons such as fluffy material, burning; In compactedization with breed the stage, by adding rare-earth, Mg, Ca vermiculizer and 75 silicon iron inoculator, make compactedization process and preparation process carry out more abundant, improve the nodulizing rate of cast iron.Finally, the object that the low tin silicon molybdenum vermicular cast iron casting parts obtained is heat-treated is, improve the comprehensive mechanical property of low tin silicon molybdenum vermicular cast iron, while acquisition high strength, there is good plasticity and toughness, principle, after low tin silicon molybdenum vermicular cast iron is heated to austenitic area, puts into salt made from earth containing a comparatively high percentage of sodium chloride and make supercooled austenite process air cooler after isothermal form tempered martensite, and the tempered martensite physical efficiency of formation improves the obdurability of low tin silicon molybdenum vermicular cast iron further.
In sum, owing to have employed technique scheme, the invention has the beneficial effects as follows:
1, product nodulizing rate of the present invention is high, has the over-all propertieies such as intensity is high, casting forming function is good, can meet the material requirements of superpower diesel engine to key components and parts.
2, add a small amount of antimony, tin, niobium and molybdenum alloy element, low tin silicon molybdenum vermicular cast iron chilling tendency is little, and the slenderness ratio of quasiflake graphite is less, and make the intensity of low tin silicon molybdenum vermicular cast iron, wear resisting property and thermal fatigue resistance excellent, input cost is not high simultaneously.
3, preparation technology is simple to operate, and nodulizing rate is high, is suitable for industrialization scale operation.
Embodiment
Below in conjunction with embodiment, the present invention is described in detail.
In order to make the object of 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.
embodiment one
A kind of low tin silicon molybdenum vermicular cast iron, described low tin silicon molybdenum vermicular cast iron is become to be grouped into by following by weight percentage: carbon is 3.55%, and silicon is 2.2%, molybdenum is 0.15%, and manganese is 0.27%, and niobium is 0.24%, chromium is 0.15%, tin is 0.025%, and antimony is 0.023%, and vanadium is 0.14%, titanium is 0.18%, the total content of p and s is no more than 0.06%, and surplus is iron and inevitable impurity thereof, and described low tin silicon molybdenum vermicular cast iron is obtained by following steps:
Step 1, raw material prepare and Smelting of iron, during Smelting of iron, raw material iron is put into converter heat fused, after raw material iron all melts, regulate bath temperature, make bath temperature control at about 1400 DEG C, then in molten bath, decarburizer is added, sweetening agent, reductor, carries out decarburization, desulfurization, deoxidation to the molten iron in molten bath;
After step 2, decarburization, desulfurization, deoxidation step complete, intensification bath temperature, makes it to reach 1440 DEG C, then in molten bath, add ferrochrome and ferromanganese continuously, make the chromium content in molten bath and Fe content reach pre-provisioning request, regulate temperature, make temperature control at 1470 DEG C, keep 10min;
After step 3, step 2 complete, add reductor and carry out secondary deoxidation, add molybdenum-iron, ferro-niobium, metallic tin, vanadium iron and ferrotianium afterwards, make the alloying constituent in steel reach pre-provisioning request, then finely tune the chemical composition in molten steel;
Step 4, the CaC of iron liquid gross weight 0.55% will be accounted for
2powder is loaded in hollow T-shaped fire resisting material tube, is inserted by T-shaped pipe in iron liquid bag, makes it stir by 65rad/min speed, churning time 5min;
Step 5, cast pack processing to be toasted at 400 DEG C, then vermiculizer, nucleating agent and insulating covering agent and metallic antimony are placed in the bag end;
Step 6, step 4 is obtained iron liquid carry out alloying constituent inspection, after the assay was approved, by the method that pours, iron liquid is poured in cast pack processing, tapping temperature controls at 1470 DEG C, when tap a blast furnace liquid to bag in about 3/4 time, stopping is tapped a blast furnace, and then add and account for the rare-earth, Mg, Ca vermiculizer of iron liquid weight 0.9% and 75 silicon iron inoculator of 0.45%, iron notch pours method and breeds; After inoculation completes, the iron liquid of remaining 1/4 is poured in ladle, and stirs 5min;
After step 7, step 6 complete, adopt the perlite deslagging agent accounting for weight of molten iron 0.25% to carry out skimming 2 times, form the thick insulation tectum of 40mm with 0.3% perlite insulation insulating covering agent on molten iron surface;
After step 8, creepage rate, in 17min, molten iron is poured, obtains foundry goods.
Heat-treated by the foundry goods obtained, its thermal treatment process is: foundry goods is placed in heat treatment furnace and is heated to 920 DEG C, insulation 3h, and then the salt made from earth containing a comparatively high percentage of sodium chloride putting into 340 DEG C is incubated 2h, and last air cooling is to room temperature.
embodiment two
A kind of low tin silicon molybdenum vermicular cast iron, described low tin silicon molybdenum vermicular cast iron is become to be grouped into by following by weight percentage: carbon is 3.4%, and silicon is 2.1%, molybdenum is 0.3%, and manganese is 0.3%, and niobium is 0.2%, chromium is 0.2%, tin is 0.01%, and antimony is 0.01%, and vanadium is 0.1%, titanium is 0.25%, the total content of p and s is no more than 0.06%, and surplus is iron and inevitable impurity thereof, and described low tin silicon molybdenum vermicular cast iron is obtained by following steps:
Step 1, raw material prepare and Smelting of iron, during Smelting of iron, raw material iron is put into converter heat fused, after raw material iron all melts, regulate bath temperature, make bath temperature control at about 1400 DEG C, then in molten bath, decarburizer is added, sweetening agent, reductor, carries out decarburization, desulfurization, deoxidation to the molten iron in molten bath;
After step 2, decarburization, desulfurization, deoxidation step complete, intensification bath temperature, makes it to reach 1440 DEG C, then in molten bath, add ferrochrome and ferromanganese continuously, make the chromium content in molten bath and Fe content reach pre-provisioning request, regulate temperature, make temperature control at 1470 DEG C, keep 10min;
After step 3, step 2 complete, add reductor and carry out secondary deoxidation, add molybdenum-iron, ferro-niobium, metallic tin, vanadium iron and ferrotianium afterwards, make the alloying constituent in steel reach pre-provisioning request, then finely tune the chemical composition in molten steel;
Step 4, the CaC of iron liquid gross weight 0.55% will be accounted for
2powder is loaded in hollow T-shaped fire resisting material tube, is inserted by T-shaped pipe in iron liquid bag, makes it stir by 65rad/min speed, churning time 5min;
Step 5, cast pack processing to be toasted at 400 DEG C, then vermiculizer, nucleating agent and insulating covering agent and metallic antimony are placed in the bag end;
Step 6, step 4 is obtained iron liquid carry out alloying constituent inspection, after the assay was approved, by the method that pours, iron liquid is poured in cast pack processing, tapping temperature controls at 1470 DEG C, when tap a blast furnace liquid to bag in about 3/4 time, stopping is tapped a blast furnace, and then add and account for the rare-earth, Mg, Ca vermiculizer of iron liquid weight 0.9% and 75 silicon iron inoculator of 0.45%, iron notch pours method and breeds; After inoculation completes, the iron liquid of remaining 1/4 is poured in ladle, and stirs 5min;
After step 7, step 6 complete, adopt the perlite deslagging agent accounting for weight of molten iron 0.25% to carry out skimming 2 times, form the thick insulation tectum of 40mm with 0.3% perlite insulation insulating covering agent on molten iron surface;
After step 8, creepage rate, in 17min, molten iron is poured, obtains foundry goods.
Heat-treated by the foundry goods obtained, its thermal treatment process is: foundry goods is placed in heat treatment furnace and is heated to 920 DEG C, insulation 3h, and then the salt made from earth containing a comparatively high percentage of sodium chloride putting into 340 DEG C is incubated 2h, and last air cooling is to room temperature.
embodiment three
A kind of low tin silicon molybdenum vermicular cast iron, described low tin silicon molybdenum vermicular cast iron is become to be grouped into by following by weight percentage: carbon is 3.8%, and silicon is 2.6%, molybdenum is 0.1%, and manganese is 0.2%, and niobium is 0.3%, chromium is 0.1%, tin is 0.03%, and antimony is 028%, and vanadium is 0.18%, titanium is 0.15%, the total content of p and s is no more than 0.06%, and surplus is iron and inevitable impurity thereof, and described low tin silicon molybdenum vermicular cast iron is obtained by following steps:
Step 1, raw material prepare and Smelting of iron, during Smelting of iron, raw material iron is put into converter heat fused, after raw material iron all melts, regulate bath temperature, make bath temperature control at about 1400 DEG C, then in molten bath, decarburizer is added, sweetening agent, reductor, carries out decarburization, desulfurization, deoxidation to the molten iron in molten bath;
After step 2, decarburization, desulfurization, deoxidation step complete, intensification bath temperature, makes it to reach 1440 DEG C, then in molten bath, add ferrochrome and ferromanganese continuously, make the chromium content in molten bath and Fe content reach pre-provisioning request, regulate temperature, make temperature control at 1470 DEG C, keep 10min;
After step 3, step 2 complete, add reductor and carry out secondary deoxidation, add molybdenum-iron, ferro-niobium, metallic tin, vanadium iron and ferrotianium afterwards, make the alloying constituent in steel reach pre-provisioning request, then finely tune the chemical composition in molten steel;
Step 4, the CaC of iron liquid gross weight 0.55% will be accounted for
2powder is loaded in hollow T-shaped fire resisting material tube, is inserted by T-shaped pipe in iron liquid bag, makes it stir by 65rad/min speed, churning time 5min;
Step 5, cast pack processing to be toasted at 400 DEG C, then vermiculizer, nucleating agent and insulating covering agent and metallic antimony are placed in the bag end;
Step 6, step 4 is obtained iron liquid carry out alloying constituent inspection, after the assay was approved, by the method that pours, iron liquid is poured in cast pack processing, tapping temperature controls at 1470 DEG C, when tap a blast furnace liquid to bag in about 3/4 time, stopping is tapped a blast furnace, and then add and account for the rare-earth, Mg, Ca vermiculizer of iron liquid weight 0.9% and 75 silicon iron inoculator of 0.45%, iron notch pours method and breeds; After inoculation completes, the iron liquid of remaining 1/4 is poured in ladle, and stirs 5min;
After step 7, step 6 complete, adopt the perlite deslagging agent accounting for weight of molten iron 0.25% to carry out skimming 2 times, form the thick insulation tectum of 40mm with 0.3% perlite insulation insulating covering agent on molten iron surface;
After step 8, creepage rate, in 17min, molten iron is poured, obtains foundry goods.
Heat-treated by the foundry goods obtained, its thermal treatment process is: foundry goods is placed in heat treatment furnace and is heated to 920 DEG C, insulation 3h, and then the salt made from earth containing a comparatively high percentage of sodium chloride putting into 340 DEG C is incubated 2h, and last air cooling is to room temperature.
embodiment four
A kind of low tin silicon molybdenum vermicular cast iron, described low tin silicon molybdenum vermicular cast iron is become to be grouped into by following by weight percentage: carbon is 3.72%, and silicon is 2.5%, molybdenum is 0.23%, and manganese is 0.24%, and niobium is 0.25%, chromium is 0.17%, tin is 0.02%, and antimony is 0.023%, and vanadium is 0.14%, titanium is 0.21%, the total content of p and s is no more than 0.06%, and surplus is iron and inevitable impurity thereof, and described low tin silicon molybdenum vermicular cast iron is obtained by following steps:
Step 1, raw material prepare and Smelting of iron, during Smelting of iron, raw material iron is put into converter heat fused, after raw material iron all melts, regulate bath temperature, make bath temperature control at about 1400 DEG C, then in molten bath, decarburizer is added, sweetening agent, reductor, carries out decarburization, desulfurization, deoxidation to the molten iron in molten bath;
After step 2, decarburization, desulfurization, deoxidation step complete, intensification bath temperature, makes it to reach 1440 DEG C, then in molten bath, add ferrochrome and ferromanganese continuously, make the chromium content in molten bath and Fe content reach pre-provisioning request, regulate temperature, make temperature control at 1470 DEG C, keep 10min;
After step 3, step 2 complete, add reductor and carry out secondary deoxidation, add molybdenum-iron, ferro-niobium, metallic tin, vanadium iron and ferrotianium afterwards, make the alloying constituent in steel reach pre-provisioning request, then finely tune the chemical composition in molten steel;
Step 4, the CaC of iron liquid gross weight 0.55% will be accounted for
2powder is loaded in hollow T-shaped fire resisting material tube, is inserted by T-shaped pipe in iron liquid bag, makes it stir by 65rad/min speed, churning time 5min;
Step 5, cast pack processing to be toasted at 400 DEG C, then vermiculizer, nucleating agent and insulating covering agent and metallic antimony are placed in the bag end;
Step 6, step 4 is obtained iron liquid carry out alloying constituent inspection, after the assay was approved, by the method that pours, iron liquid is poured in cast pack processing, tapping temperature controls at 1470 DEG C, when tap a blast furnace liquid to bag in about 3/4 time, stopping is tapped a blast furnace, and then add and account for the rare-earth, Mg, Ca vermiculizer of iron liquid weight 0.9% and 75 silicon iron inoculator of 0.45%, iron notch pours method and breeds; After inoculation completes, the iron liquid of remaining 1/4 is poured in ladle, and stirs 5min;
After step 7, step 6 complete, adopt the perlite deslagging agent accounting for weight of molten iron 0.25% to carry out skimming 2 times, form the thick insulation tectum of 40mm with 0.3% perlite insulation insulating covering agent on molten iron surface;
After step 8, creepage rate, in 17min, molten iron is poured, obtains foundry goods.
Heat-treated by the foundry goods obtained, its thermal treatment process is: foundry goods is placed in heat treatment furnace and is heated to 920 DEG C, insulation 3h, and then the salt made from earth containing a comparatively high percentage of sodium chloride putting into 340 DEG C is incubated 2h, and last air cooling is to room temperature.
In the various embodiments described above, respectively get the sample of equidimension shape, then test its mechanical property by universal testing machine, then use XJP-6A type metallography microscope sem observation graphite form, obtain following table:
As seen from the above table, the tensile strength of low tin silicon molybdenum vermicular cast iron of the present invention reaches 434MPa, and yield strength reaches 363MPa, and hardness (HBS) reaches 275, nodulizing rate reaches 86.7%, over-all propertieies such as having nodulizing rate high, intensity is high, hardness is good, can meet the material requirements of superpower diesel engine to key components and parts, simultaneously, preparation technology is simple to operate, and nodulizing rate is high, is suitable for industrialization scale operation.
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 (4)
1. a low tin silicon molybdenum vermicular cast iron, is characterized in that, described low tin silicon molybdenum vermicular cast iron is become to be grouped into by following by weight percentage: carbon is 3.4-3.8%, silicon is 2.1-2.6%, and molybdenum is 0.1-0.3%, and manganese is 0.2-0.3%, niobium is 0.2-0.3%, chromium is 0.1-0.2%, and tin is 0.01-0.03%, and antimony is 0.01-028%, vanadium is 0.1-0.18%, titanium is 0.15-0.25%, and the total content of p and s is no more than 0.06%, and surplus is iron and inevitable impurity thereof.
2. low tin silicon molybdenum vermicular cast iron as claimed in claim 1, is characterized in that, described low tin silicon molybdenum vermicular cast iron is become to be grouped into by following by weight percentage: carbon is 3.55%, silicon is 2.2%, and molybdenum is 0.15%, and manganese is 0.27%, niobium is 0.24%, chromium is 0.15%, and tin is 0.025%, and antimony is 0.023%, vanadium is 0.14%, titanium is 0.18%, and the total content of p and s is no more than 0.06%, and surplus is iron and inevitable impurity thereof.
3. a preparation method for low tin silicon molybdenum vermicular cast iron as claimed in claim 1 or 2, is characterized in that, comprise the following steps:
Step 1, raw material prepare and Smelting of iron, during Smelting of iron, raw material iron is put into converter heat fused, after raw material iron all melts, regulate bath temperature, make bath temperature control at about 1400 DEG C, then in molten bath, decarburizer is added, sweetening agent, reductor, carries out decarburization, desulfurization, deoxidation to the molten iron in molten bath;
After step 2, decarburization, desulfurization, deoxidation step complete, intensification bath temperature, makes it to reach 1440 DEG C, then in molten bath, add ferrochrome and ferromanganese continuously, make the chromium content in molten bath and Fe content reach pre-provisioning request, regulate temperature, make temperature control at 1470 DEG C, keep 10min;
After step 3, step 2 complete, add reductor and carry out secondary deoxidation, add molybdenum-iron, ferro-niobium, metallic tin, vanadium iron and ferrotianium afterwards, make the alloying constituent in steel reach pre-provisioning request, then finely tune the chemical composition in molten steel;
Step 4, the CaC of iron liquid gross weight 0.55% will be accounted for
2powder is loaded in hollow T-shaped fire resisting material tube, is inserted by T-shaped pipe in iron liquid bag, makes it stir by 65rad/min speed, churning time 5min;
Step 5, cast pack processing to be toasted at 400 DEG C, then vermiculizer, nucleating agent and insulating covering agent and metallic antimony are placed in the bag end;
Step 6, step 4 is obtained iron liquid carry out alloying constituent inspection, after the assay was approved, by the method that pours, iron liquid is poured in cast pack processing, tapping temperature controls at 1470 DEG C, when tap a blast furnace liquid to bag in about 3/4 time, stopping is tapped a blast furnace, and then add and account for the rare-earth, Mg, Ca vermiculizer of iron liquid weight 0.9% and 75 silicon iron inoculator of 0.45%, iron notch pours method and breeds; After inoculation completes, the iron liquid of remaining 1/4 is poured in ladle, and stirs 5min;
After step 7, step 6 complete, adopt the perlite deslagging agent accounting for weight of molten iron 0.25% to carry out skimming 2 times, form the thick insulation tectum of 40mm with 0.3% perlite insulation insulating covering agent on molten iron surface;
After step 8, creepage rate, in 17min, molten iron is poured, obtains foundry goods.
4. the preparation method of a kind of low tin silicon molybdenum vermicular cast iron as claimed in claim 3, it is characterized in that, the foundry goods obtained also needs to heat-treat, its thermal treatment process is: foundry goods is placed in heat treatment furnace and is heated to 920 DEG C, insulation 3h, and then the salt made from earth containing a comparatively high percentage of sodium chloride putting into 340 DEG C is incubated 2h, last air cooling is to room temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510843800.4A CN105401066B (en) | 2015-11-26 | 2015-11-26 | Low tin silicon molybdenum vermicular cast iron and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510843800.4A CN105401066B (en) | 2015-11-26 | 2015-11-26 | Low tin silicon molybdenum vermicular cast iron and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105401066A true CN105401066A (en) | 2016-03-16 |
| CN105401066B CN105401066B (en) | 2017-11-14 |
Family
ID=55466816
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510843800.4A Active CN105401066B (en) | 2015-11-26 | 2015-11-26 | Low tin silicon molybdenum vermicular cast iron and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105401066B (en) |
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106521303A (en) * | 2016-10-31 | 2017-03-22 | 广西大学 | Thermal treatment method for chromium-containing wear resisting cast iron |
| CN106521299A (en) * | 2016-12-16 | 2017-03-22 | 广西大学 | Heat treatment method for heat-resistant cast-iron boiler grate bar |
| CN106544579A (en) * | 2016-12-16 | 2017-03-29 | 广西大学 | A kind of antiacid cast iron circulator and preparation method thereof |
| CN106544580A (en) * | 2016-12-16 | 2017-03-29 | 广西大学 | A kind of heat treatment method of cast iron tappet |
| CN106636873A (en) * | 2016-12-16 | 2017-05-10 | 广西大学 | Thermal treatment method for anti-acid cast iron circulator |
| CN106636868A (en) * | 2016-12-16 | 2017-05-10 | 广西大学 | Cast iron machine tool body and preparation method thereof |
| CN106801186A (en) * | 2016-12-16 | 2017-06-06 | 广西大学 | A kind of alkali resistant cast iron condenser and preparation method thereof |
| CN106801184A (en) * | 2016-12-12 | 2017-06-06 | 广西大学 | A kind of cast iron ploughshare and preparation method thereof |
| CN106801185A (en) * | 2016-12-15 | 2017-06-06 | 广西大学 | A kind of chilled cast iron roll and preparation method thereof |
| CN106929748A (en) * | 2017-04-21 | 2017-07-07 | 龙邹 | Vertical lathe body of a kind of twin columns and preparation method thereof |
| CN106987762A (en) * | 2017-04-21 | 2017-07-28 | 龙邹 | A kind of cast-iron crankshaft and preparation method thereof |
| CN107012386A (en) * | 2017-04-20 | 2017-08-04 | 龙邹 | A kind of machining center lathe bed and preparation method thereof |
| CN108130475A (en) * | 2017-12-20 | 2018-06-08 | 山西东方恒略精密铸造有限公司襄汾新盛分公司 | A kind of casting vermiculizer adding method |
| CN108624807A (en) * | 2017-08-29 | 2018-10-09 | 西安工业大学 | A kind of high nodulizing rate vermicular cast iron of the high either pearlite occurred of as cast condition and preparation method thereof |
| CN110016606A (en) * | 2019-05-17 | 2019-07-16 | 重庆银河铸锻有限责任公司 | A kind of electro-smelting method of high-strength cast iron part |
| CN110129660A (en) * | 2019-05-17 | 2019-08-16 | 重庆银河铸锻有限责任公司 | A kind of electro-smelting method of corrosion-resistant High-Hardness Cast Iron part |
| CN114101599A (en) * | 2021-10-29 | 2022-03-01 | 西峡县众德汽车部件有限公司 | Method for improving deformation of sand-lined iron mold sand-coated axle sand box |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1111071A2 (en) * | 1999-12-22 | 2001-06-27 | Hyundai Motor Company | Method of manufacturing a compacted vermicular graphite cast iron for engine block |
| CN101956123A (en) * | 2010-09-28 | 2011-01-26 | 丹阳市振兴锅炉配件有限公司 | Production method of high-abrasion-resistance antifatigue vermicular cast iron |
| US20110094632A1 (en) * | 2005-03-04 | 2011-04-28 | Laszlo Pelsoeczy | Ledeburite cast iron with a high carbide content and an evenly distributed graphite embodiment |
| CN102409220A (en) * | 2011-11-25 | 2012-04-11 | 西安工业大学 | High-strength vermicular cast iron and preparation method thereof |
| CN102676906A (en) * | 2012-06-20 | 2012-09-19 | 丹阳市锦雄机械制造有限公司 | Preparation method of compacted graphite cast iron |
| CN104357736A (en) * | 2014-11-04 | 2015-02-18 | 攀枝花市大西南实业有限公司 | Vanadium-titanium vermicular cast iron |
-
2015
- 2015-11-26 CN CN201510843800.4A patent/CN105401066B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1111071A2 (en) * | 1999-12-22 | 2001-06-27 | Hyundai Motor Company | Method of manufacturing a compacted vermicular graphite cast iron for engine block |
| US20110094632A1 (en) * | 2005-03-04 | 2011-04-28 | Laszlo Pelsoeczy | Ledeburite cast iron with a high carbide content and an evenly distributed graphite embodiment |
| CN101956123A (en) * | 2010-09-28 | 2011-01-26 | 丹阳市振兴锅炉配件有限公司 | Production method of high-abrasion-resistance antifatigue vermicular cast iron |
| CN102409220A (en) * | 2011-11-25 | 2012-04-11 | 西安工业大学 | High-strength vermicular cast iron and preparation method thereof |
| CN102676906A (en) * | 2012-06-20 | 2012-09-19 | 丹阳市锦雄机械制造有限公司 | Preparation method of compacted graphite cast iron |
| CN104357736A (en) * | 2014-11-04 | 2015-02-18 | 攀枝花市大西南实业有限公司 | Vanadium-titanium vermicular cast iron |
Non-Patent Citations (1)
| Title |
|---|
| 符寒光: "《耐磨材料500问》", 30 September 2011, 机械工业出版社 * |
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106521303A (en) * | 2016-10-31 | 2017-03-22 | 广西大学 | Thermal treatment method for chromium-containing wear resisting cast iron |
| CN106801184A (en) * | 2016-12-12 | 2017-06-06 | 广西大学 | A kind of cast iron ploughshare and preparation method thereof |
| CN106801185A (en) * | 2016-12-15 | 2017-06-06 | 广西大学 | A kind of chilled cast iron roll and preparation method thereof |
| CN106636873A (en) * | 2016-12-16 | 2017-05-10 | 广西大学 | Thermal treatment method for anti-acid cast iron circulator |
| CN106544580A (en) * | 2016-12-16 | 2017-03-29 | 广西大学 | A kind of heat treatment method of cast iron tappet |
| CN106636868A (en) * | 2016-12-16 | 2017-05-10 | 广西大学 | Cast iron machine tool body and preparation method thereof |
| CN106801186A (en) * | 2016-12-16 | 2017-06-06 | 广西大学 | A kind of alkali resistant cast iron condenser and preparation method thereof |
| CN106544579A (en) * | 2016-12-16 | 2017-03-29 | 广西大学 | A kind of antiacid cast iron circulator and preparation method thereof |
| CN106521299A (en) * | 2016-12-16 | 2017-03-22 | 广西大学 | Heat treatment method for heat-resistant cast-iron boiler grate bar |
| CN107012386A (en) * | 2017-04-20 | 2017-08-04 | 龙邹 | A kind of machining center lathe bed and preparation method thereof |
| CN106987762A (en) * | 2017-04-21 | 2017-07-28 | 龙邹 | A kind of cast-iron crankshaft and preparation method thereof |
| CN106929748A (en) * | 2017-04-21 | 2017-07-07 | 龙邹 | Vertical lathe body of a kind of twin columns and preparation method thereof |
| CN108624807A (en) * | 2017-08-29 | 2018-10-09 | 西安工业大学 | A kind of high nodulizing rate vermicular cast iron of the high either pearlite occurred of as cast condition and preparation method thereof |
| CN108624807B (en) * | 2017-08-29 | 2019-12-17 | 西安工业大学 | Cast high-pearlite high-creep-rate vermicular graphite cast iron and preparation method thereof |
| CN108130475A (en) * | 2017-12-20 | 2018-06-08 | 山西东方恒略精密铸造有限公司襄汾新盛分公司 | A kind of casting vermiculizer adding method |
| CN110016606A (en) * | 2019-05-17 | 2019-07-16 | 重庆银河铸锻有限责任公司 | A kind of electro-smelting method of high-strength cast iron part |
| CN110129660A (en) * | 2019-05-17 | 2019-08-16 | 重庆银河铸锻有限责任公司 | A kind of electro-smelting method of corrosion-resistant High-Hardness Cast Iron part |
| CN110016606B (en) * | 2019-05-17 | 2022-01-25 | 重庆机床(集团)有限责任公司 | Electric furnace smelting method for high-strength iron castings |
| CN114101599A (en) * | 2021-10-29 | 2022-03-01 | 西峡县众德汽车部件有限公司 | Method for improving deformation of sand-lined iron mold sand-coated axle sand box |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105401066B (en) | 2017-11-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105401066A (en) | Low-tin-silicon-molybdenum vermicular graphite cast iron and preparation method thereof | |
| CN100453686C (en) | Casting high boron abrasion-proof stainless steel containing high hardness boride and preparation method thereof | |
| CN104120332B (en) | High-intensity high-tenacity spheroidal graphite cast-iron 600-10 and production technology thereof | |
| CN108754297B (en) | A kind of vermicular cast iron of seawater corrosion resistance and preparation method thereof | |
| CN101942619B (en) | Glass mould material of alloy cast iron and preparation method thereof | |
| CN103422033B (en) | A kind of low temperature Deformed Steel Bars and production technique thereof | |
| CN102747268B (en) | High-strength high-ductility nodular cast iron and manufacturing method thereof | |
| CN104060157B (en) | A kind of hypereutectic high-chromium white cast iron and preparation method thereof | |
| CN109576567B (en) | Preparation process of nodular iron casting for heavy axle main speed reducer shell | |
| CN102071351B (en) | Vermicularizing treatment process of vanadium-titanium vermicular graphite cast iron | |
| CN103602878B (en) | High tough spheroidal graphite cast iron preparation method | |
| CN105385935B (en) | A kind of high silicon molybdenum vermicular cast iron and its production method | |
| CN104357736B (en) | A kind of vanadium titanium vermicular cast iron | |
| CN108913985A (en) | High-carbon-equivalent high-strength gray cast iron and preparation method thereof | |
| CN105734397A (en) | High-strength gray cast iron material and melting pouring technology thereof | |
| CN104846265A (en) | Ultralow-temperature austenite wear-resistant ductile iron material and preparation method thereof | |
| CN110295312A (en) | A kind of low-temperature ball spheroidal graphite cast iron and its production technology and application | |
| CN104513926B (en) | Spheroidal graphite cast iron with high strength and high elongation rate and preparation method of spheroidal graphite cast iron | |
| CN103436808A (en) | Low-carbon equivalent high strength and toughness cast steel and preparation method thereof | |
| CN102400032B (en) | Large-cross-section nodular cast iron | |
| CN110029266A (en) | A kind of cast iron silicon-zirconium-manganese-chromium inovulant and preparation method thereof | |
| CN102534090B (en) | Preparation method of-60 ℃ low-temperature impact nodular cast iron | |
| KR20130087213A (en) | High strength flake graphite iron using rare earth element and preparation method thereof | |
| CN111455263A (en) | Environment-friendly low-temperature nodular cast iron produced by using low-rare earth alloy and production process thereof | |
| CN114411049B (en) | Low-cost and high-strength ferritic nodular cast iron and preparation method and application thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20190401 Address after: 215000 No. 96 Zhenbei Road, Suzhou High-tech Zone, Jiangsu Province Patentee after: Suzhou Qinbao Precise Machinery Co., Ltd. Address before: 610000 Wuhou District Wuhou new town administrative committee, Chengdu, Sichuan, 2 Wuyi East Road 15, 1 units, 2 level 231. Patentee before: CHENGDU JIUSHIDU INDUSTRIAL PRODUCT DESIGN CO., LTD. |