CN104805350A - Method for preparing ADI nodular cast iron capable of resisting impact of low temperature of 40 DEG C below zero - Google Patents
Method for preparing ADI nodular cast iron capable of resisting impact of low temperature of 40 DEG C below zero Download PDFInfo
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Abstract
A method for preparing an ADI nodular cast iron capable of resisting the impact of a low temperature of 40 DEG C below zero relates to a method for preparing a low-temperature-resistant ADI ductile iron, and solves the technical problem that the impact energy of a conventional ADI ductile iron 900/650/09 in a high-cold environment is relatively low. The method comprises the following steps: firstly, melting ductile cast iron Q10, low-manganese steel scrap and returns and a proper amount of nickel plates and then adding nickel plates and sheet copper for smelting so as to obtain an iron liquid; secondly, performing spheroidization and inoculation treatment; thirdly, adding a desulfurization agent; fourthly, casting to obtain a sample; fifthly, preserving heat of the sample twice, then placing the sample into a nitrate medium, and discharging to obtain the ADI nodular cast iron. The ADI nodular cast iron has the yield strength of 660-690 MPa, the tensile strength of 910-950 MPa and the elongation of 9-11%, and the unnotched impact value of the ADI nodular cast iron prepared at the temperature of 40 DEG C below zero is 105-120 J. The method is applied to the field of nodular cast iron preparation.
Description
Technical field
The present invention relates to a kind of preparation method of anti-low temperature ADI spheroidal graphite cast iron.
Background technology
Bainite ductile iron difficult to understand is called for short ADI spheroidal graphite cast iron, and after ADI spheroidal graphite cast iron mainly refers to thermal treatment, metallographic structure mainly forms is the spheroidal graphite cast iron of austenite and bainite.It adds a certain amount of nodulizing agent and graphitizer by going in iron liquid in casting, to obtain in globular graphite crystallization, and obtained by salt made from earth containing a comparatively high percentage of sodium chloride medium same temperature hardening heat treatment.There is the characteristics such as high strength, high-ductility, high tenacity, high wear resistance, damping property and good bending fatigue strength.It is compared with cast steel, and have higher yield tensile ratio, yield tensile ratio is approximately the 0.8-0.9 ratio of tensile strength (yield strength with), the yield tensile ratio of cast steel is about 0.6, be the excellent material having steel and cast iron advantage concurrently, be widely used in the aspects such as railway freight-car, automobile, engineering machinery.In these alloys, carbon content exceedes the amount that to be retained in when eutectic temperature in austenite sosoloid.The general carbon content of industrial cast iron is 2% ~ 4%.Carbon exists mainly with graphite form in cast iron, sometimes also exists with cementite form.Outside de-carbon, the silicon also containing 1% ~ 3% in cast iron, and the element such as manganese, phosphorus, sulphur.Cast alloy iron is also containing elements such as nickel, chromium, molybdenum, aluminium, copper, boron, vanadium.Carbon, silicon are the principal elements affecting cast iron microstructure and performance.
Current bainite ductile iron difficult to understand and ADI spheroidal graphite cast iron low-temperature performance generally do not explicitly call for both at home and abroad, requirement be all non-notch ballistic work under normal temperature, different according to non-notch ballistic work numerical value under the different normal temperature of its trade mark.Such as, in American Standard ASTM897A 897M-06 specification, the trade mark is in 900/650/09, and being defined in non-notch impact value at normal temperature 22 ± 4 DEG C is 100J.When reality is under psychro-environment (lower than-20 DEG C), ADI spheroidal graphite cast iron low-temperature performance will obviously reduce, according to the impelling strength curve of GB GB/T1348-2009 Appendix D about spheroidal graphite cast iron, the impact value of spheroidal graphite cast iron reduces with temperature and reduces, and reduce obvious especially, compare reduction about 60% with the impact value of 20 DEG C for-40 DEG C; ADI spheroidal graphite cast iron low temperature impact properties rule is identical with it, and existing according to our test-results, the trade mark is the non-notch impact value of 20 DEG C, 900/650/09ADI spheroidal graphite cast iron is 105J, and non-notch impact value 60J when-40 DEG C.The automobile produced by this kind of material and railway freight car products are when extremely frigid zones runs, and performance will reduce greatly, have a strong impact on operating safety.Some country external has been had to have ask for something to ADI spheroidal graphite cast iron low-temperature performance under psychro-environment at present, but less demanding, and it requires the numerical value of numerical value under normal temperature.How smelting technology is controlled, to meet the trade mark be 900/650/09ADI spheroidal graphite cast iron for the adjustment added of chemical Composition Control and other alloying elements and suitable heat treating method, impact numerical value 100J under-40 DEG C of low temperature impact properties are not less than its normal temperature, this is the key content of this material of research.
Summary of the invention
The invention solves existing ADI spheroidal graphite cast iron 900/650/09 technical problem that ballistic work is lower under psychro-environment, provide the preparation method of the ADI spheroidal graphite cast iron of anti-40 DEG C of low-temperature impacts.
The preparation method of the ADI spheroidal graphite cast iron of anti-40 DEG C of low-temperature impacts of the present invention carries out according to the following steps:
One, 1510 DEG C ~ 1530 DEG C fusings are warmed up to according to mass fraction by after the mixing of the foundry returns of 70 parts of spheroidal graphite pig iron Q10,10 parts low manganese steel scraps and 20 parts, then the nickel plate melting of spheroidal graphite pig iron Q10, low manganese steel scrap and foundry returns total mass 0.4% ~ 0.5% is added, add the copper sheet melting of spheroidal graphite pig iron Q10, low manganese steel scrap and foundry returns total mass 1.1% ~ 1.3% after melting again, obtain iron liquid;
Two, nodulizing agent is put into side at the bottom of nodularization bag, and 75% silicon iron inoculator is covered above nodulizing agent, the broken steel of low manganese of one deck and nucleating agent equal in quality is covered above nucleating agent, cover clad, then the iron liquid adopting the method that pours step one to be obtained carries out nodularization, inoculation, adds silicon titanate innoculant when breeding;
Three, in the iron liquid through step 2 process, add sweetening agent, then stir, skim, more static 1 minute;
Four, by when the bonded hard ferrite magnet of step 3 process is 1370 DEG C ~ 1400 DEG C, start casting, casting adds with stream the silicon titanate innoculant that granularity is 0.10mm ~ 0.15mm simultaneously, obtains sample;
Five, sample step 4 obtained is warming up to 650 DEG C ~ 680 DEG C insulations 1 ~ 2 hour at normal temperatures, continue to be warmed up to 880 DEG C ~ 900 DEG C insulations 2 ~ 3 hours, then sample quick tapping is put into the salt made from earth containing a comparatively high percentage of sodium chloride medium of 370 DEG C ~ 400 DEG C, be incubated and come out of the stove after 1 ~ 2 hour, naturally cool to room temperature, both the ADI spheroidal graphite cast iron of anti-40 DEG C of low-temperature impacts; In step one, in nickel plate, nickel content is 99.99%; In step one, in copper sheet, copper content is 99.9%; In step 2, the add-on of nodulizing agent is 1.3% of spheroidal graphite pig iron Q10, low manganese steel scrap and foundry returns total mass; In step 2, the add-on of 75% silicon iron inoculator is spheroidal graphite pig iron Q10, low manganese steel scrap and foundry returns total mass 1.0%; In step 2, the add-on of silicon titanate innoculant is spheroidal graphite pig iron Q10, low manganese steel scrap and foundry returns total mass 0.1%; In step 3, the main component of sweetening agent is natural volcanic ash, and the add-on of sweetening agent is 0.5% of spheroidal graphite pig iron Q10, low manganese steel scrap and foundry returns total mass; In step 4, the add-on of silicon titanate innoculant is 0.1% of spheroidal graphite pig iron Q10, low manganese steel scrap and foundry returns total mass.The consisting of of salt made from earth containing a comparatively high percentage of sodium chloride medium in step 5: 50%KNO
3+ 50%NaNO
2.
The present invention includes following beneficial effect:
The graphite pebbles rounding of the present invention's-40 DEG C of low-temperature impact ADI spheroidal graphite cast iron, is evenly distributed, and every square millimeter is greater than 300, and nodulizing grade is 1-2 level, and size of graphite ball is 7-8 level.Graphite pebbles shape affects greatly the unit elongation of spheroidal graphite cast iron and impelling strength.In unit surface, graphite pebbles is more, rounding got over by graphite pebbles, graphite sphere diameter is less, no matter at normal temperature or at low temperatures, the impact value of spheroidal graphite cast iron has the trend of increase, and the comprehensive mechanical performance of spheroidal graphite cast iron also can improve, so patent of the present invention should improve the graphite pebbles number in nodulizing grade and unit surface as far as possible, this is also the reason place that this patent adopts twice spheroidization and inoculation.The yield strength of the present invention's-40 DEG C of low-temperature impact ADI spheroidal graphite cast iron is 660MPa ~ 690MPa, tensile strength is 910MPa ~ 950MPa, unit elongation is 9 ~ 11%, and the non-notch impact value of-40 DEG C of low-temperature impact ADI spheroidal graphite cast iron prepared-40 DEG C of the present invention is 105J ~ 120J.
Twice spheroidization and inoculation process in the present invention can increase graphite nucleation ability, crystal grain thinning, increases the number of graphite; And have employed and a kind ofly close the nodularization bag of extraordinary band clad, this wrap in cover clad after, in nodularization bag, relative closure is better, in nodularization process, add bag internal pressure, nodulizing agent absorbs good, in bag, liquid iron balling is abundant and even, about nodulizing grade improves half rank.Deoxidation in the present invention, desulfurization process make the sulphur content in original iron melt be down to less than 0.02% (because too high sulphur affects nodularization effect, reducing the impact value under low temperature environment).Leaving standstill of 1 ~ 2min is carried out to the iron liquid after nodularization, is conducive to active metal such as the oxide compound of Mg, Ba, Al, Fe and sulfide and floats, thus purifying molten iron.
The carbon content of-40 DEG C of low-temperature impact ADI spheroidal graphite cast iron prepared by the present invention is 3.5% ~ 3.7%, because higher carbon content can increase the mobility of metal, certain graphitization expansion reduces shrink defects.
The silicone content of-40 DEG C of low-temperature impact ADI spheroidal graphite cast iron prepared by the present invention is 2.75% ~ 2.90%, and silicon is greying forming element, can not only suppress the precipitation of carbide in bainite transformation process, can also refinement graphite pebbles, promotes that bainite transformation is formed.Silicon on the low-temperature impact impact of ADI spheroidal graphite cast iron obviously, when silicon is below 3%, increase with silicon amount, the cold impact value of ADI spheroidal graphite cast iron rises very fast, so silicon controls 2.75% ~ 2.90% as well by the present invention, if carbon silicon amount is too high will cause Graphite Blooming.
Fe content prepared by the present invention is less than 0.20%, and manganese can stable austenite district, promotes the formation of carbide, at During Eutectoid Decomposition, reduces the temperature of eutectoid transformation, plays a part to stablize and refine pearlite.The manganese dissolved in austenite has the tendency of strong segregation, causes the formation in carbide network, the black cellular microstructure, white area, and these materials formed on crystal boundary seriously reduce low-temperature flexibility.Carbide, segregation are the principal elements affecting magnesium iron low-temperature transformation temperature, and manganese often increases by 0.1%, and brittle transition temperature approximately improves 10 DEG C ~ 12 DEG C.
In magnesium iron, due to the impact of other compositions, the solubleness of phosphorus is very little, and when phosphorus content is greater than 0.05%, phosphorus will be separated out with iron phosphide eutectic form.Due to reasons such as composition, speed of cooling, segregations, be easy in magnesium iron form iron phosphide eutectic.Because iron phosphide eutectic fusing point is lower, be enriched in eutectic cell boundary final set when solidifying, intercrystalline precipitation.Formed netted or intermittently netted time serious, more seriously reduce toughness and the plasticity of magnesium iron, reduce low temperature impact properties, so phosphorus is low as far as possible, the content of phosphorus of the present invention is lower than 0.035%.
In order to compensate the intensity under foundry goods low temperature, the nickel content of the present invention's-40 DEG C of low-temperature impact spheroidal graphite cast iron is 0.4% ~ 0.5%, it is limited to the extension improving ADI spheroidal graphite cast iron, but the low temperature intensity of foundry goods can be improved, and be evenly distributed in eutectic cell, eutectic cell border can not be made because of segregation brittle, namely can improve cold impact value a little.
For significantly improving the cold impact value of ADI spheroidal graphite cast iron, the copper content of the present invention's-40 DEG C of low-temperature impact spheroidal graphite cast iron is 1.2% ~ 1.4%.Copper can improve isothermal transformation temperature, suppresses carbide in bainite to be formed, has namely delayed transition process.General magnesium iron, from austenitizing temperature to 350 DEG C of isothermal quenching, obtains high tenacity only 10 minutes, and can make this time lengthening 2-3 hour after adding about 1.2% copper.Add the ADI spheroidal graphite cast iron of about 1.2% copper, the remained austenite content after its isothermal quenching increases, and make elongation increase about 50%, cold impact value improves about 30%.
Accompanying drawing explanation
Fig. 1 is the nodulizing grade detected result of the non-isothermal quenching of ADI spheroidal graphite cast iron of anti-40 DEG C of low-temperature impacts prepared by test one;
Fig. 2 is the metallographic structure detected result of the ADI auctile iron isothermal quenching of anti-40 DEG C of low-temperature impacts prepared by test one.
Embodiment
Embodiment one: the preparation method of the ADI spheroidal graphite cast iron of anti-40 DEG C of low-temperature impacts of present embodiment carries out according to the following steps:
One, 1510 DEG C ~ 1530 DEG C fusings are warmed up to according to mass fraction by after the mixing of the foundry returns of 70 parts of spheroidal graphite pig iron Q10,10 parts low manganese steel scraps and 20 parts, then the nickel plate melting of spheroidal graphite pig iron Q10, low manganese steel scrap and foundry returns total mass 0.4% ~ 0.5% is added, add the copper sheet melting of spheroidal graphite pig iron Q10, low manganese steel scrap and foundry returns total mass 1.1% ~ 1.3% after melting again, obtain iron liquid;
Two, nodulizing agent is put into side at the bottom of nodularization bag, and 75% silicon iron inoculator is covered above nodulizing agent, the broken steel of low manganese of one deck and nucleating agent equal in quality is covered above nucleating agent, cover clad, then the iron liquid adopting the method that pours step one to be obtained carries out nodularization, inoculation, adds silicon titanate innoculant when breeding;
Three, in the iron liquid through step 2 process, add sweetening agent, then stir, skim, more static 1 minute;
Four, by when the bonded hard ferrite magnet of step 3 process is 1370 DEG C ~ 1400 DEG C, start casting, casting adds with stream the silicon titanate innoculant that granularity is 0.10mm ~ 0.15mm simultaneously, obtains sample;
Five, sample step 4 obtained is warming up to 650 DEG C ~ 680 DEG C insulations 1 ~ 2 hour at normal temperatures, continue to be warmed up to 880 DEG C ~ 900 DEG C insulations 2 ~ 3 hours, then sample quick tapping is put into the salt made from earth containing a comparatively high percentage of sodium chloride medium of 370 DEG C ~ 400 DEG C, be incubated and come out of the stove after 1 ~ 2 hour, naturally cool to room temperature, both the ADI spheroidal graphite cast iron of anti-40 DEG C of low-temperature impacts; In step one, in nickel plate, nickel content is 99.99%; In step one, in copper sheet, copper content is 99.9%; In step 2, the add-on of nodulizing agent is 1.3% of spheroidal graphite pig iron Q10, low manganese steel scrap and foundry returns total mass; In step 2, the add-on of 75% silicon iron inoculator is spheroidal graphite pig iron Q10, low manganese steel scrap and foundry returns total mass 1.0%; In step 2, the add-on of silicon titanate innoculant is spheroidal graphite pig iron Q10, low manganese steel scrap and foundry returns total mass 0.1%; In step 3, the main component of sweetening agent is natural volcanic ash, and the add-on of sweetening agent is 0.5% of spheroidal graphite pig iron Q10, low manganese steel scrap and foundry returns total mass; In step 4, the add-on of silicon titanate innoculant is 0.1% of spheroidal graphite pig iron Q10, low manganese steel scrap and foundry returns total mass.The consisting of of salt made from earth containing a comparatively high percentage of sodium chloride medium in step 5: 50%KNO
3+ 50%NaNO
2.
The graphite pebbles rounding of-40 DEG C of low-temperature impact ADI spheroidal graphite cast iron prepared by present embodiment, every square millimeter is greater than 300, and nodulizing grade is 1-2 level, and after isothermal quenching, matrix metallographic structure is that upper bainite adds austenite.
Spheroidal graphite pig iron Q10, low manganese steel scrap and foundry returns in present embodiment, the mass percent shared by its main component is as following table:
Table 1
Adopt the effect that following verification experimental verification the present invention is bright:
Test one: the preparation method of the ADI spheroidal graphite cast iron of anti-40 DEG C of low-temperature impacts of this test carries out according to the following steps:
One, 1510 DEG C of fusings are warmed up to according to mass fraction by after the mixing of the foundry returns of 70 parts of spheroidal graphite pig iron Q10,10 parts low manganese steel scraps and 20 parts, then the nickel plate melting of spheroidal graphite pig iron Q10, low manganese steel scrap and foundry returns total mass 0.48% is added, add the copper sheet melting of spheroidal graphite pig iron Q10, low manganese steel scrap and foundry returns total mass 1.21% after melting again, obtain iron liquid;
Two, nodulizing agent is put into side at the bottom of nodularization bag, and 75% silicon iron inoculator is covered above nodulizing agent, the broken steel of low manganese of one deck and nucleating agent equal in quality is covered above nucleating agent, cover clad, then the iron liquid adopting the method that pours step one to be obtained carries out nodularization, inoculation, adds silicon titanate innoculant when breeding;
Three, in the iron liquid through step 2 process, add sweetening agent, then stir, skim, more static 1 minute;
Four, by when the bonded hard ferrite magnet of step 3 process is 1370 DEG C, start casting, casting adds with stream the silicon titanate innoculant that granularity is 0.10mm simultaneously, obtains sample;
Five, sample step 4 obtained is warming up to 650 DEG C ~ 680 DEG C insulations 1 hour at normal temperatures, continue to be warmed up to 880 DEG C of insulations 2 hours, then sample quick tapping is put into the salt made from earth containing a comparatively high percentage of sodium chloride medium of 370 DEG C, be incubated and come out of the stove after 1 hour, naturally cool to room temperature, both the ADI spheroidal graphite cast iron of anti-40 DEG C of low-temperature impacts; In step one, in nickel plate, nickel content is 99.99%; In step one, in copper sheet, copper content is 99.9%; In step 2, the add-on of nodulizing agent is 1.3% of spheroidal graphite pig iron Q10, low manganese steel scrap and foundry returns total mass; In step 2, the add-on of 75% silicon iron inoculator is spheroidal graphite pig iron Q10, low manganese steel scrap and foundry returns total mass 1.0%; In step 2, the add-on of silicon titanate innoculant is spheroidal graphite pig iron Q10, low manganese steel scrap and foundry returns total mass 0.1%; In step 3, the main component of sweetening agent is natural volcanic ash, and the add-on of sweetening agent is 0.5% of spheroidal graphite pig iron Q10, low manganese steel scrap and foundry returns total mass; In step 4, the add-on of silicon titanate innoculant is 0.1% of spheroidal graphite pig iron Q10, low manganese steel scrap and foundry returns total mass; The consisting of of salt made from earth containing a comparatively high percentage of sodium chloride medium in step 5: 50%KNO
3+ 50%NaNO
2.
As shown in Figure 1, as can be seen from Figure 1, the nodulizing grade of the non-isothermal quenching of ADI spheroidal graphite cast iron of anti-40 DEG C of low-temperature impacts of this test preparation is 1 grade to the nodulizing grade detected result of the non-isothermal quenching of ADI spheroidal graphite cast iron of anti-40 DEG C of low-temperature impacts of this test preparation.
The metallographic structure detected result of the ADI auctile iron isothermal quenching of anti-40 DEG C of low-temperature impacts of this test preparation as shown in Figure 2, as can be seen from Figure 2, the metallographic structure of the ADI auctile iron isothermal quenching of anti-40 DEG C of low-temperature impacts of this test preparation is austenite+bainite.
Test two: the preparation method of the ADI spheroidal graphite cast iron of a kind of anti-40 DEG C of low-temperature impacts of this test carries out according to the following steps:
One, 1515 DEG C of fusings are warmed up to according to mass fraction by after the mixing of the foundry returns of 70 parts of spheroidal graphite pig iron Q10,10 parts low manganese steel scraps and 20 parts, then the nickel plate melting of spheroidal graphite pig iron Q10, low manganese steel scrap and foundry returns total mass 0.47% is added, add the copper sheet melting of spheroidal graphite pig iron Q10, low manganese steel scrap and foundry returns total mass 1.25% after melting again, obtain iron liquid;
Two, nodulizing agent is put into side at the bottom of nodularization bag, and 75% silicon iron inoculator is covered above nodulizing agent, the broken steel of low manganese of one deck and nucleating agent equal in quality is covered above nucleating agent, cover clad, then the iron liquid adopting the method that pours step one to be obtained carries out nodularization, inoculation, adds silicon titanate innoculant when breeding;
Three, in the iron liquid through step 2 process, add sweetening agent, then stir, skim, more static 1 minute;
Four, by when the bonded hard ferrite magnet of step 3 process is 1380 DEG C, start casting, casting adds with stream the silicon titanate innoculant that granularity is 0.11mm simultaneously, obtains sample;
Five, sample step 4 obtained is warming up to 650 DEG C ~ 680 DEG C insulations 1 hour at normal temperatures, continue to be warmed up to 885 DEG C of insulations 2 hours, then sample quick tapping is put into the salt made from earth containing a comparatively high percentage of sodium chloride medium of 380 DEG C, be incubated and come out of the stove after 1 hour, naturally cool to room temperature, both the ADI spheroidal graphite cast iron of anti-40 DEG C of low-temperature impacts; In step one, in nickel plate, nickel content is 99.99%; In step one, in copper sheet, copper content is 99.9%; In step 2, the add-on of nodulizing agent is 1.3% of spheroidal graphite pig iron Q10, low manganese steel scrap and foundry returns total mass; In step 2, the add-on of 75% silicon iron inoculator is spheroidal graphite pig iron Q10, low manganese steel scrap and foundry returns total mass 1.0%; In step 2, the add-on of silicon titanate innoculant is spheroidal graphite pig iron Q10, low manganese steel scrap and foundry returns total mass 0.1%; In step 3, the main component of sweetening agent is natural volcanic ash, and the add-on of sweetening agent is 0.5% of spheroidal graphite pig iron Q10, low manganese steel scrap and foundry returns total mass; In step 4, the add-on of silicon titanate innoculant is 0.1% of spheroidal graphite pig iron Q10, low manganese steel scrap and foundry returns total mass; The consisting of of salt made from earth containing a comparatively high percentage of sodium chloride medium in step 5: 50%KNO
3+ 50%NaNO
2.
Test three: the preparation method of the ADI spheroidal graphite cast iron of a kind of anti-40 DEG C of low-temperature impacts of this test carries out according to the following steps:
One, 1520 DEG C of fusings are warmed up to according to mass fraction by after the mixing of the foundry returns of 70 parts of spheroidal graphite pig iron Q10,10 parts low manganese steel scraps and 20 parts, then the nickel plate melting of spheroidal graphite pig iron Q10, low manganese steel scrap and foundry returns total mass 0.48% is added, add the copper sheet melting of spheroidal graphite pig iron Q10, low manganese steel scrap and foundry returns total mass 1.2% after melting again, obtain iron liquid;
Two, nodulizing agent is put into side at the bottom of nodularization bag, and 75% silicon iron inoculator is covered above nodulizing agent, the broken steel of low manganese of one deck and nucleating agent equal in quality is covered above nucleating agent, cover clad, then the iron liquid adopting the method that pours step one to be obtained carries out nodularization, inoculation, adds silicon titanate innoculant when breeding;
Three, in the iron liquid through step 2 process, add sweetening agent, then stir, skim, more static 1 minute;
Four, by when the bonded hard ferrite magnet of step 3 process is 1385 DEG C, start casting, casting adds with stream the silicon titanate innoculant that granularity is 0.12mm simultaneously, obtains sample;
Five, sample step 4 obtained is warming up to 650 DEG C ~ 680 DEG C insulations 1 hour at normal temperatures, continue to be warmed up to 890 DEG C of insulations 2 hours, then sample quick tapping is put into the salt made from earth containing a comparatively high percentage of sodium chloride medium of 385 DEG C, be incubated and come out of the stove after 1 hour, naturally cool to room temperature, both the ADI spheroidal graphite cast iron of anti-40 DEG C of low-temperature impacts; In step one, in copper sheet, copper content is 99.9%; In step 2, the add-on of nodulizing agent is 1.3% of spheroidal graphite pig iron Q10, low manganese steel scrap and foundry returns total mass; In step 2, the add-on of 75% silicon iron inoculator is spheroidal graphite pig iron Q10, low manganese steel scrap and foundry returns total mass 1.0%; In step 2, the add-on of silicon titanate innoculant is spheroidal graphite pig iron Q10, low manganese steel scrap and foundry returns total mass 0.1%; In step 3, the main component of sweetening agent is natural volcanic ash, and the add-on of sweetening agent is 0.5% of spheroidal graphite pig iron Q10, low manganese steel scrap and foundry returns total mass; In step 4, the add-on of silicon titanate innoculant is 0.1% of spheroidal graphite pig iron Q10, low manganese steel scrap and foundry returns total mass; The consisting of of salt made from earth containing a comparatively high percentage of sodium chloride medium in step 5: 50%KNO
3+ 50%NaNO
2.
Test four: the preparation method of the ADI spheroidal graphite cast iron of a kind of anti-40 DEG C of low-temperature impacts of this test carries out according to the following steps:
One, 1525 DEG C of fusings are warmed up to according to mass fraction by after the mixing of the foundry returns of 70 parts of spheroidal graphite pig iron Q10,10 parts low manganese steel scraps and 20 parts, then the nickel plate melting of spheroidal graphite pig iron Q10, low manganese steel scrap and foundry returns total mass 0.46% is added, add the copper sheet melting of spheroidal graphite pig iron Q10, low manganese steel scrap and foundry returns total mass 1.27% after melting again, obtain iron liquid;
Two, nodulizing agent is put into side at the bottom of nodularization bag, and 75% silicon iron inoculator is covered above nodulizing agent, the broken steel of low manganese of one deck and nucleating agent equal in quality is covered above nucleating agent, cover clad, then the iron liquid adopting the method that pours step one to be obtained carries out nodularization, inoculation, adds silicon titanate innoculant when breeding;
Three, in the iron liquid through step 2 process, add sweetening agent, then stir, skim, more static 1 minute;
Four, by when the bonded hard ferrite magnet of step 3 process is 1390 DEG C, start casting, casting adds with stream the silicon titanate innoculant that granularity is 0.14mm simultaneously, obtains sample;
Five, sample step 4 obtained is warming up to 650 DEG C ~ 680 DEG C insulations 1 hour at normal temperatures, continue to be warmed up to 895 insulation 2 hours, then sample quick tapping is put into the salt made from earth containing a comparatively high percentage of sodium chloride medium of 390 DEG C, be incubated and come out of the stove after 1 hour, naturally cool to room temperature, both the ADI spheroidal graphite cast iron of anti-40 DEG C of low-temperature impacts; In step one, in copper sheet, copper content is 99.9%; In step 2, the add-on of nodulizing agent is 1.3% of spheroidal graphite pig iron Q10, low manganese steel scrap and foundry returns total mass; In step 2, the add-on of 75% silicon iron inoculator is spheroidal graphite pig iron Q10, low manganese steel scrap and foundry returns total mass 1.0%; In step 2, the add-on of silicon titanate innoculant is spheroidal graphite pig iron Q10, low manganese steel scrap and foundry returns total mass 0.1%; In step 3, the main component of sweetening agent is natural volcanic ash, and the add-on of sweetening agent is 0.5% of spheroidal graphite pig iron Q10, low manganese steel scrap and foundry returns total mass; In step 4, the add-on of silicon titanate innoculant is 0.1% of spheroidal graphite pig iron Q10, low manganese steel scrap and foundry returns total mass; The consisting of of salt made from earth containing a comparatively high percentage of sodium chloride medium in step 5: 50%KNO
3+ 50%NaNO
2.
Test five: the preparation method of the ADI spheroidal graphite cast iron of a kind of anti-40 DEG C of low-temperature impacts of this test carries out according to the following steps:
One, 1530 DEG C of fusings are warmed up to according to mass fraction by after the mixing of the foundry returns of 70 parts of spheroidal graphite pig iron Q10,10 parts low manganese steel scraps and 20 parts, then the nickel plate melting of spheroidal graphite pig iron Q10, low manganese steel scrap and foundry returns total mass 0.49% is added, add the copper sheet melting of spheroidal graphite pig iron Q10, low manganese steel scrap and foundry returns total mass 1.23% after melting again, obtain iron liquid;
Two, nodulizing agent is put into side at the bottom of nodularization bag, and 75% silicon iron inoculator is covered above nodulizing agent, the broken steel of low manganese of one deck and nucleating agent equal in quality is covered above nucleating agent, cover clad, then the iron liquid adopting the method that pours step one to be obtained carries out nodularization, inoculation, adds silicon titanate innoculant when breeding;
Three, in the iron liquid through step 2 process, add sweetening agent, then stir, skim, more static 1 minute;
Four, by when the bonded hard ferrite magnet of step 3 process is 1400 DEG C, start casting, casting adds with stream the silicon titanate innoculant that granularity is 0.15mm simultaneously, obtains sample;
Five, sample step 4 obtained is warming up to 650 DEG C ~ 680 DEG C insulations 1 hour at normal temperatures, continue to be warmed up to 900 DEG C of insulations 2 hours, then sample quick tapping is put into the salt made from earth containing a comparatively high percentage of sodium chloride medium of 400 DEG C, be incubated and come out of the stove after 1 hour, naturally cool to room temperature, both the ADI spheroidal graphite cast iron of anti-40 DEG C of low-temperature impacts; In step one, in copper sheet, copper content is 99.9%; In step 2, the add-on of nodulizing agent is 1.3% of spheroidal graphite pig iron Q10, low manganese steel scrap and foundry returns total mass; In step 2, the add-on of 75% silicon iron inoculator is spheroidal graphite pig iron Q10, low manganese steel scrap and foundry returns total mass 1.0%; In step 2, the add-on of silicon titanate innoculant is spheroidal graphite pig iron Q10, low manganese steel scrap and foundry returns total mass 0.1%; In step 3, the main component of sweetening agent is natural volcanic ash, and the add-on of sweetening agent is 0.5% of spheroidal graphite pig iron Q10, low manganese steel scrap and foundry returns total mass; In step 4, the add-on of silicon titanate innoculant is 0.1% of spheroidal graphite pig iron Q10, low manganese steel scrap and foundry returns total mass; The consisting of of salt made from earth containing a comparatively high percentage of sodium chloride medium in step 5: 50%KNO
3+ 50%NaNO
2.
The chemical composition detected result of the ADI spheroidal graphite cast iron of the anti-40 DEG C low-temperature impacts of test prepared by one to test five is as following table:
Table 2
| Experiment sequence number | C | S | Mn | P | Si | Ni | Cu |
| 1 | 3.55 | 0.012 | 0.15 | 0.030 | 2.75 | 0.48 | 1.21 |
| 2 | 3.58 | 0.011 | 0.14 | 0.034 | 2.80 | 0.47 | 1.25 |
| 3 | 3.65 | 0.011 | 0.16 | 0.031 | 2.76 | 0.48 | 1.20 |
| 4 | 3.55 | 0.012 | 0.15 | 0.029 | 2.82 | 0.46 | 1.27 |
| 5 | 3.60 | 0.011 | 0.15 | 0.032 | 2.79 | 0.49 | 1.23 |
The mechanical property detected result of the ADI spheroidal graphite cast iron of the anti-40 DEG C low-temperature impacts of test prepared by one to test five is as following table:
Table 3
Claims (1)
1. the preparation method of the ADI spheroidal graphite cast iron of anti-40 DEG C of low-temperature impacts, is characterized in that the preparation method of the ADI spheroidal graphite cast iron of anti-40 DEG C of low-temperature impacts carries out according to the following steps:
One, 1510 DEG C ~ 1530 DEG C fusings are warmed up to according to mass fraction by after the mixing of the foundry returns of 70 parts of spheroidal graphite pig iron Q10,10 parts low manganese steel scraps and 20 parts, then the nickel plate melting of spheroidal graphite pig iron Q10, low manganese steel scrap and foundry returns total mass 0.4% ~ 0.5% is added, add the copper sheet melting of spheroidal graphite pig iron Q10, low manganese steel scrap and foundry returns total mass 1.1% ~ 1.3% after melting again, obtain iron liquid;
Two, nodulizing agent is put into side at the bottom of nodularization bag, and 75% silicon iron inoculator is covered above nodulizing agent, the broken steel of low manganese of one deck and nucleating agent equal in quality is covered above nucleating agent, cover clad, then the iron liquid adopting the method that pours step one to be obtained carries out nodularization, inoculation, adds silicon titanate innoculant when breeding;
Three, in the iron liquid through step 2 process, add sweetening agent, then stir, skim, more static 1 minute;
Four, by when the bonded hard ferrite magnet of step 3 process is 1370 DEG C ~ 1400 DEG C, start casting, casting adds with stream the silicon titanate innoculant that granularity is 0.10mm ~ 0.15mm simultaneously, obtains sample;
Five, sample step 4 obtained is warming up to 650 DEG C ~ 680 DEG C insulations 1 ~ 2 hour at normal temperatures, continue to be warmed up to 880 DEG C ~ 900 DEG C insulations 2 ~ 3 hours, then sample quick tapping is put into the salt made from earth containing a comparatively high percentage of sodium chloride medium of 370 DEG C ~ 400 DEG C, be incubated and come out of the stove after 1 ~ 2 hour, naturally cool to room temperature, both the ADI spheroidal graphite cast iron of anti-40 DEG C of low-temperature impacts; In step one, in nickel plate, nickel content is 99.99%; In step one, in copper sheet, copper content is 99.9%; In step 2, the add-on of nodulizing agent is 1.3% of spheroidal graphite pig iron Q10, low manganese steel scrap and foundry returns total mass; In step 2, the add-on of 75% silicon iron inoculator is spheroidal graphite pig iron Q10, low manganese steel scrap and foundry returns total mass 1.0%; In step 2, the add-on of silicon titanate innoculant is spheroidal graphite pig iron Q10, low manganese steel scrap and foundry returns total mass 0.1%; In step 3, the main component of sweetening agent is natural volcanic ash, and the add-on of sweetening agent is 0.5% of spheroidal graphite pig iron Q10, low manganese steel scrap and foundry returns total mass; In step 4, the add-on of silicon titanate innoculant is 0.1% of spheroidal graphite pig iron Q10, low manganese steel scrap and foundry returns total mass.The consisting of of salt made from earth containing a comparatively high percentage of sodium chloride medium in step 5: 50%KNO
3+ 50%NaNO
2.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105603294A (en) * | 2015-12-31 | 2016-05-25 | 河南纽威机械制造有限公司 | Method for improving wear resistance of centrifugal type nodular cast iron pump case |
| CN112267059A (en) * | 2020-10-17 | 2021-01-26 | 安徽军明机械制造有限公司 | Treatment process for enhancing mechanical property of nodular cast iron |
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2015
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105603294A (en) * | 2015-12-31 | 2016-05-25 | 河南纽威机械制造有限公司 | Method for improving wear resistance of centrifugal type nodular cast iron pump case |
| CN112267059A (en) * | 2020-10-17 | 2021-01-26 | 安徽军明机械制造有限公司 | Treatment process for enhancing mechanical property of nodular cast iron |
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