CN105401064A - Medium silicon molybdenum nodular cast iron and production method thereof - Google Patents
Medium silicon molybdenum nodular cast iron and production method thereof Download PDFInfo
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Abstract
The invention discloses a medium silicon molybdenum nodular cast iron. The medium silicon molybdenum nodular cast iron comprises the following components in percentage by mass: 3.1-3.3% of C, 3-5% of Si, 0-0.3% of Mn, 0-0.07% of P, 0-0.02% of S, 0.5-1.2% of Mo, 0.025-0.045% of Mg, and the balance of Fe and inevitable microelements. The invention also discloses a production method of the medium silicon molybdenum nodular cast iron: putting the prepared materials into an electric furnace for smelting, and adding a nodulizing agent and a nucleating agent during ladle casting to improve the properties of the nodular iron. The production method of the medium silicon molybdenum nodular cast iron is capable of eliminating a chilling tendency caused by nodulized elements and thus obtaining a cementite-free carting, and further increasing graphite cores and the quantity thereof; besides, the production method has the advantages of reduction of a nodular diameter, uniform distribution, round shape, high graphite grade, refining of eutectic cells, reduction of segregation, improvement of mechanical properties of the casting; as a result, the quality of products is guaranteed.
Description
Technical field
The present invention relates to spheroidal graphite cast iron technical field, be specifically related to a kind of Mid-Si Mo Cast Iron and production method thereof.
Background technology
Cast iron is the iron-carbon that carbon content is greater than 2.11%, obtained through high-temperature fusion and casting by the iron and steel such as commercial iron, steel scrap and alloy material thereof, except Fe, also containing and other cast iron in carbon separate out with graphite form, if the cast iron of the graphite of separating out when be spherical is just spheroidal graphite cast iron.Iron casting is almost applied in all main industrial sectors, the intensity that these goal are high, plasticity, toughness, wear resistance, resistance to serious heat and mechanical shock, high temperature resistant or low temperature, corrosion-resistant and dimensional stability etc.Particularly in the exhaust manifold technical field of automobile, the exhaust manifold of automobile is connected with engine by flange, is the parts that in exhaust system, temperature is the highest.Exhaust manifold stands the harsh climate condition etc. in the thermal shocking of high temperature gas flow and driving process, requires that the material of exhaust manifold is more heat-resisting, resistance to oxidation.Medium-Si, Mo magnesium iron, as material topmost in current automobile gas exhausting manifold branch, has good hot strength, thermal fatigue, excellent oxidation-resistance, growth property and high-temperature creep resistance, and moderate, can apply in a large number produce.But due to the engine technology progress gradually of automobile, power and the compression ratio of engine increase gradually, heat-resisting shock-resistant requirement for vapor pipe is slowly increased, in prior art, the performance of magnesium iron slowly can not meet the demands, the particularly restriction of some medium-Si, Mo casting structure, cause the abnormal nodularizing of graphite in the thick large part metallographic structure of foundry goods, decaying spheroidisation etc., seriously reduce the nodulizing grade of graphite, have impact on the quality of product, therefore need better material to manufacture high performance exhaust manifold.
Application number a kind of spheroidal graphite cast iron that has been the disclosure of the invention of 201210425806.6, spheroidal graphite cast iron piston and manufacturing process thereof, mass percent in described spheroidal graphite cast iron shared by each component is: carbon (C): 3.50% ~ 3.60%, silicon (Si): 1.90% ~ 2.10%, 0.50% < manganese (Mn)≤0.60%, 0 < phosphorus (P≤0.030%, 0 < sulphur (S≤0.010%, copper (Cu): 0.50% ~ 0.60%, rhenium (RE): 0.010% ~ 0.030%, magnesium (Mg): 0.030% ~ 0.050%, with remaining iron (Fe).Described spheroidal graphite cast iron piston is obtained by above-mentioned spheroidal graphite cast iron, it is by being covered with skim molding sand at slightly shaping swage inner chamber, by the quality to swage, wall thickness and the conservative control covering sand layer thickness, make filling type, solidifying and cool and complete under a more satisfactory condition of foundry goods, eliminate the factor producing casting flaw to greatest extent, thus substantially increase the quality of foundry goods.This magnesium iron is be applied in heat-resisting shock-resistant technical field equally, but its cast member is the better simply piston of structure, is difficult to the complex part type meeting exhaust manifold.
It is a kind of containing niobium Silicon-rich spheroidal graphite cast iron preparation method that application number has been the disclosure of the invention of 201310521664.8, mass percent is: C:2.9 ~ 3.4%, Si:4.3 ~ 4.8%, Mn:0.1 ~ 1.0%, P:0.01 ~ 0.04%, S:0.O1%, Mg:0.05 ~ 0.1%, Cr:0 ~ 0.2%, Cu:0 ~ 1.0%, Nb:0 ~ 0.6%, Ce:0.02 ~ 0.03%, surplus be Fe and inevitably trace element; By obtained after raw material melting, spheroidizing, inoculation; With prepared by method of the present invention containing niobium Silicon-rich spheroidal graphite cast iron, Oxygen potential more than 80%, graphite pebbles is uniformly distributed.This invention improves the content of silicon, and its wear resistance and intensity promote to some extent, but when being applied in complex part, nodularization effect is general.
Summary of the invention
In view of this, the object of the invention is for the deficiencies in the prior art, a kind of Mid-Si Mo Cast Iron and production method thereof are provided, the chilling tendency that nodularization element causes can be eliminated, obtain the foundry goods without cementite, increase graphite nuclei and quantity.
For achieving the above object, the present invention by the following technical solutions:
A kind of Mid-Si Mo Cast Iron, the mass percent shared by each component is: C:3.1 ~ 3.3%, Si:3 ~ 5%, Mn:0 ~ 0.3%, P:0 ~ 0.07%, S:0 ~ 0.02%, Mo:0.5 ~ 1.2%, Mg:0.025 ~ 0.045%, surplus be Fe and inevitably trace element.
A production method for above-mentioned Mid-Si Mo Cast Iron, comprises the steps:
1) by good for the proportioning pig iron, foundry returns, steel scrap and molybdenum-iron proportionally, be placed into melting in medium-frequency induction furnace, after molten iron temperature reaches 1450 ~ 1480 DEG C, carry out slag making, skim, ensure that iron liquid is pure;
2) control molten iron tapping temperature at 1500 ~ 1550 DEG C, use electronic crane scale to sling to water and wrap in stove mouth and tap a blast furnace, weight of tapping a blast furnace is 480 ~ 520kg;
3) in casting ladle, add rare-earth magnesium series nodulizing agent and carry out spheroidizing, the nodulizing agent added is 0.8 ~ 1.2% of molten steel quality;
4) in casting ladle, add silicon strontium nucleating agent carry out inoculation, the silicon strontium nucleating agent added is 0.5 ~ 0.8% of molten steel quality;
5) control molten iron temperature to pour into a mould 1360 ~ 1460 DEG C time, in casting process, adopt silicon strontium random inoculant to carry out second time inoculation, the silicon strontium random inoculant added is 0.1 ~ 0.2% of molten steel quality.
Further, the mass percent shared by the pig iron that in step 1), proportioning is good, foundry returns, steel scrap and molybdenum-iron is: the pig iron 20 ~ 30%, foundry returns 60 ~ 70%, steel scrap 5 ~ 10%, molybdenum-iron 0.4 ~ 0.6%.
Further, the mass percent in described rare-earth magnesium series nodulizing agent shared by each component is: Re:0.7 ~ 0.8%, Mg:5.5 ~ 6.5%, Ca:2 ~ 2.5%, Si:40 ~ 50%, Al:0.4 ~ 0.5%, Ba:2 ~ 2.3%, and all the other are Fe.
Further, the granularity of described rare-earth magnesium series nodulizing agent is 1 ~ 20mm.
Further, the mass percent in described silicon strontium nucleating agent shared by each component is: Si:75 ~ 76%, Sr:1.5 ~ 1.6%, Al:0.1 ~ 0.15%, Ca:0.08 ~ 0.1%, and all the other are Fe.
Further, the granularity of described silicon strontium nucleating agent is 0.8 ~ 10mm.
Further, the mass percent in described silicon strontium random inoculant shared by each component is: Si:75 ~ 76%, Sr:1.5 ~ 1.6%, Al:0.1 ~ 0.15%, Mg:1.5 ~ 2%, Ca:0.08 ~ 0.1%, and all the other are Fe.
Further, the granularity of described silicon strontium random inoculant is 0.03 ~ 0.3mm.
The invention has the beneficial effects as follows: first the content of carbon in spheroidal graphite cast iron is promoted, when selection material, the pig iron adopts the pig iron that carbon content is higher, ensure the mass percent of carbon in magnesium iron within the limits prescribed, the lifting of carbon content is of value to the formation of carbide in magnesium iron and quantity is guaranteed, and is beneficial to the intensity and hardness that improve magnesium iron.Molybdenum is a kind of rare metallic element, eutectic transformation temperature can be reduced, have the effect that refining eutectic is rolled into a ball, molybdenum makes the carbide generated in cast iron become stable, improves the intensity of foundry goods, hardness, effectively raise the resistance toheat of foundry goods, in magnesium iron, molybdenum matches with carbon, and the raising of carbon equivalent is by the effect of molybdenum, make graphite eutectic group in magnesium iron finer and closely woven, ensure that foundry goods has good castability.Silicon is strong graphitizing element, in the present invention, carbon equivalent is higher, can make that graphite is thicker, quantity increases, corresponding magnesium iron hardness can decline, and improves the content of silicon, can impel while in cast iron, globular graphite quantity increases, globular graphite is evenly distributed, graphite higher grade, matches and ensure the fine and closely woven degree of globular graphite, substantially increase the performances such as the intensity of spheroidal graphite cast iron, hardness with molybdenum.
The melting of material adopts medium-frequency induction furnace, a kind of by three-phase main-frequency alternating-current, direct current is become after rectification, again direct current is become adjustable electric current, supply is by the exchange current flow through in electric capacity and ruhmkorff coil, highdensity magnetic line of force is produced in induction coil, and cut the metallic substance held in induction coil, very large eddy current is produced in metallic substance, the unbound electron of metal self flows and will produce heat in the metallic object having resistance, the melting to each material can be realized, heat up each uniform composition in process of production very fast, and well can control the temperature of melting, the monitoring for temperature in subsequent step can be ensured.Thermometric when coming out of the stove with temperature-measuring gun at fire door thermometric, can accomplish strict control to tapping temperature.
Rare-earth magnesium series nodulizing agent is the Si-Mg-Fe alloy containing rare earth element, and with the advantage of multiple nodulizing agent, magnesium is the element that spheroidization ability is the strongest, and rare earth spheroidization is relatively more steady, can not by the impact of other tension-active elements.Calcium effect is steady, but spheroidization ability is weak, and three's synergy can carry out spheroidizing to carbon more in magnesium iron, better effects if.Strontium is the most effectively promote inoculant elements in silicon iron inoculator, in cast iron solidified process, it is minimum that nucleating agent makes condensate depression be down to by the core amounts increasing graphite eutectic growth, there is the ability of very strong reduction spoken parts in traditional operas, and this nucleating agent can increase primary graphite magnesium iron in spheroidal graphite cast iron, the quality of magnesium iron can be improved, eliminate spoken parts in traditional operas defect, and adopt random inoculant to carry out second time in the present invention to breed, effect is significantly good.Nodulizing agent and nucleating agent all make particulate state, and its granularity ensures in suitable scope, can melt rapidly and uniformly in molten iron, especially random inoculant, and granularity is minimum is 0.03mm, and nucleating agent can be made to melt very soon, and effect is fine.
The present invention can eliminate the chilling tendency that nodularization element causes, obtain without the foundry goods of cementite, increase graphite nuclei and quantity, sphere diameter is diminished, is evenly distributed, form rounding, graphite grade are high, refining eutectic group, minimizing segregation, improve the mechanical property of foundry goods, ensure that the quality of product.
Accompanying drawing explanation
Fig. 1 is spheroidal graphite cast iron state of the present invention;
Fig. 2 is not for adopt spheroidal graphite cast iron state of the present invention.
Embodiment
Below by embodiment one to embodiment eight, the present invention will be further described.
Embodiment one
Present embodiments provide a kind of Mid-Si Mo Cast Iron, the mass percent shared by each component is: C:3.15%, Si:3.5%, Mn:0.3%, P:0.07%, S:0.02%, Mo:0.6%, Mg:0.03, surplus be Fe and inevitably trace element.
The production method of above-mentioned Mid-Si Mo Cast Iron, comprises the steps:
1) by good for the proportioning pig iron, foundry returns, steel scrap and molybdenum-iron proportionally, be placed into melting in medium-frequency induction furnace, after molten iron temperature reaches 1450 ~ 1480 DEG C, carry out slag making, skim, ensure that iron liquid is pure;
2) control molten iron tapping temperature at 1520 ~ 1540 DEG C, use electronic crane scale to sling to water and wrap in stove mouth and tap a blast furnace, weight of tapping a blast furnace is 490 ~ 510kg;
3) in casting ladle, add rare-earth magnesium series nodulizing agent and carry out spheroidizing, the nodulizing agent added is 1% of molten steel quality;
4) in casting ladle, add silicon strontium nucleating agent carry out inoculation, the silicon strontium nucleating agent added is 0.7% of molten steel quality;
5) control molten iron temperature to pour into a mould 1390 ~ 1430 DEG C time, in casting process, adopt silicon strontium random inoculant to carry out second time inoculation, the silicon strontium random inoculant added is 0.15% of molten steel quality.
Wherein, the mass percent in described rare-earth magnesium series nodulizing agent shared by each component is: Re:0.7 ~ 0.8%, Mg:5.5 ~ 6.5%, Ca:2 ~ 2.5%, Si:40 ~ 50%, Al:0.4 ~ 0.5%, Ba:2 ~ 2.3%, all the other are Fe, and the granularity of described rare-earth magnesium series nodulizing agent is 3mm.
Mass percent in described silicon strontium nucleating agent shared by each component is: Si:75.5%, Sr:1.55%, Al:0.13%, Ca:0.09%, and all the other are Fe, and the granularity of described silicon strontium nucleating agent is 1.5mm.
Mass percent in described silicon strontium random inoculant shared by each component is: Si:75.5%, Sr:1.55%, Al:0.13%, Ca:0.09%, Mg:1.75%, and all the other are Fe, and the granularity of described silicon strontium random inoculant is 0.05mm.
Embodiment two
Present embodiments provide a kind of Mid-Si Mo Cast Iron, the mass percent shared by each component is: C:3.18%, Si:3.9%, Mn:0.3%, P:0.07%, S:0.02%, Mo:0.7%, Mg:0.034, surplus be Fe and inevitably trace element.
The production method of above-mentioned Mid-Si Mo Cast Iron, comprises the steps:
1) by good for the proportioning pig iron, foundry returns, steel scrap and molybdenum-iron proportionally, be placed into melting in medium-frequency induction furnace, after molten iron temperature reaches 1450 ~ 1480 DEG C, carry out slag making, skim, ensure that iron liquid is pure;
2) control molten iron tapping temperature at 1520 ~ 1540 DEG C, use electronic crane scale to sling to water and wrap in stove mouth and tap a blast furnace, weight of tapping a blast furnace is 490 ~ 510kg;
3) in casting ladle, add rare-earth magnesium series nodulizing agent and carry out spheroidizing, the nodulizing agent added is 1% of molten steel quality;
4) in casting ladle, add silicon strontium nucleating agent carry out inoculation, the silicon strontium nucleating agent added is 0.7% of molten steel quality;
5) control molten iron temperature to pour into a mould 1390 ~ 1430 DEG C time, in casting process, adopt silicon strontium random inoculant to carry out second time inoculation, the silicon strontium random inoculant added is 0.15% of molten steel quality.
Wherein, the mass percent in described rare-earth magnesium series nodulizing agent shared by each component is: Re:0.7 ~ 0.8%, Mg:5.5 ~ 6.5%, Ca:2 ~ 2.5%, Si:40 ~ 50%, Al:0.4 ~ 0.5%, Ba:2 ~ 2.3%, all the other are Fe, and the granularity of described rare-earth magnesium series nodulizing agent is 3mm.
Mass percent in described silicon strontium nucleating agent shared by each component is: Si:75.5%, Sr:1.55%, Al:0.13%, Ca:0.09%, and all the other are Fe, and the granularity of described silicon strontium nucleating agent is 1.5mm.
Mass percent in described silicon strontium random inoculant shared by each component is: Si:75.5%, Sr:1.55%, Al:0.13%, Ca:0.09%, Mg:1.75%, and all the other are Fe, and the granularity of described silicon strontium random inoculant is 0.05mm.
Embodiment three
Present embodiments provide a kind of Mid-Si Mo Cast Iron, the mass percent shared by each component is: C:3.22%, Si:4.3%, Mn:0.3%, P:0.07%, S:0.02%, Mo:0.7%, Mg:0.038, surplus be Fe and inevitably trace element.
The production method of above-mentioned Mid-Si Mo Cast Iron, comprises the steps:
1) by good for the proportioning pig iron, foundry returns, steel scrap and molybdenum-iron proportionally, be placed into melting in medium-frequency induction furnace, after molten iron temperature reaches 1450 ~ 1480 DEG C, carry out slag making, skim, ensure that iron liquid is pure;
2) control molten iron tapping temperature at 1520 ~ 1540 DEG C, use electronic crane scale to sling to water and wrap in stove mouth and tap a blast furnace, weight of tapping a blast furnace is 490 ~ 510kg;
3) in casting ladle, add rare-earth magnesium series nodulizing agent and carry out spheroidizing, the nodulizing agent added is 1% of molten steel quality;
4) in casting ladle, add silicon strontium nucleating agent carry out inoculation, the silicon strontium nucleating agent added is 0.7% of molten steel quality;
5) control molten iron temperature to pour into a mould 1390 ~ 1430 DEG C time, in casting process, adopt silicon strontium random inoculant to carry out second time inoculation, the silicon strontium random inoculant added is 0.15% of molten steel quality.
Wherein, the mass percent in described rare-earth magnesium series nodulizing agent shared by each component is: Re:0.7 ~ 0.8%, Mg:5.5 ~ 6.5%, Ca:2 ~ 2.5%, Si:40 ~ 50%, Al:0.4 ~ 0.5%, Ba:2 ~ 2.3%, all the other are Fe, and the granularity of described rare-earth magnesium series nodulizing agent is 3mm.
Mass percent in described silicon strontium nucleating agent shared by each component is: Si:75.5%, Sr:1.55%, Al:0.13%, Ca:0.09%, and all the other are Fe, and the granularity of described silicon strontium nucleating agent is 1.5mm.
Mass percent in described silicon strontium random inoculant shared by each component is: Si:75.5%, Sr:1.55%, Al:0.13%, Ca:0.09%, Mg:1.75%, and all the other are Fe, and the granularity of described silicon strontium random inoculant is 0.05mm.
Embodiment four
Present embodiments provide a kind of Mid-Si Mo Cast Iron, the mass percent shared by each component is: C:3.26%, Si:4.6%, Mn:0.3%, P:0.07%, S:0.02%, Mo:1%, Mg:0.042, surplus be Fe and inevitably trace element.
The production method of above-mentioned Mid-Si Mo Cast Iron, comprises the steps:
1) by good for the proportioning pig iron, foundry returns, steel scrap and molybdenum-iron proportionally, be placed into melting in medium-frequency induction furnace, after molten iron temperature reaches 1450 ~ 1480 DEG C, carry out slag making, skim, ensure that iron liquid is pure;
2) control molten iron tapping temperature at 1520 ~ 1540 DEG C, use electronic crane scale to sling to water and wrap in stove mouth and tap a blast furnace, weight of tapping a blast furnace is 490 ~ 510kg;
3) in casting ladle, add rare-earth magnesium series nodulizing agent and carry out spheroidizing, the nodulizing agent added is 1% of molten steel quality;
4) in casting ladle, add silicon strontium nucleating agent carry out inoculation, the silicon strontium nucleating agent added is 0.7% of molten steel quality;
5) control molten iron temperature to pour into a mould 1390 ~ 1430 DEG C time, in casting process, adopt silicon strontium random inoculant to carry out second time inoculation, the silicon strontium random inoculant added is 0.15% of molten steel quality.
Wherein, the mass percent in described rare-earth magnesium series nodulizing agent shared by each component is: Re:0.7 ~ 0.8%, Mg:5.5 ~ 6.5%, Ca:2 ~ 2.5%, Si:40 ~ 50%, Al:0.4 ~ 0.5%, Ba:2 ~ 2.3%, all the other are Fe, and the granularity of described rare-earth magnesium series nodulizing agent is 3mm.
Mass percent in described silicon strontium nucleating agent shared by each component is: Si:75.5%, Sr:1.55%, Al:0.13%, Ca:0.09%, and all the other are Fe, and the granularity of described silicon strontium nucleating agent is 1.5mm.
Mass percent in described silicon strontium random inoculant shared by each component is: Si:75.5%, Sr:1.55%, Al:0.13%, Ca:0.09%, Mg:1.75%, and all the other are Fe, and the granularity of described silicon strontium random inoculant is 0.05mm.
Embodiment five
Present embodiments provide a kind of Mid-Si Mo Cast Iron, the mass percent shared by each component is: C:3.3%, Si:4.9%, Mn:0.3%, P:0.07%, S:0.02%, Mo:1.1%, Mg:0.045, surplus be Fe and inevitably trace element.
The production method of above-mentioned Mid-Si Mo Cast Iron, comprises the steps:
1) by good for the proportioning pig iron, foundry returns, steel scrap and molybdenum-iron proportionally, be placed into melting in medium-frequency induction furnace, after molten iron temperature reaches 1450 ~ 1480 DEG C, carry out slag making, skim, ensure that iron liquid is pure;
2) control molten iron tapping temperature at 1520 ~ 1540 DEG C, use electronic crane scale to sling to water and wrap in stove mouth and tap a blast furnace, weight of tapping a blast furnace is 490 ~ 510kg;
3) in casting ladle, add rare-earth magnesium series nodulizing agent and carry out spheroidizing, the nodulizing agent added is 1% of molten steel quality;
4) in casting ladle, add silicon strontium nucleating agent carry out inoculation, the silicon strontium nucleating agent added is 0.7% of molten steel quality;
5) control molten iron temperature to pour into a mould 1390 ~ 1430 DEG C time, in casting process, adopt silicon strontium random inoculant to carry out second time inoculation, the silicon strontium random inoculant added is 0.15% of molten steel quality.
Wherein, the mass percent in described rare-earth magnesium series nodulizing agent shared by each component is: Re:0.7 ~ 0.8%, Mg:5.5 ~ 6.5%, Ca:2 ~ 2.5%, Si:40 ~ 50%, Al:0.4 ~ 0.5%, Ba:2 ~ 2.3%, all the other are Fe, and the granularity of described rare-earth magnesium series nodulizing agent is 3mm.
Mass percent in described silicon strontium nucleating agent shared by each component is: Si:75.5%, Sr:1.55%, Al:0.13%, Ca:0.09%, and all the other are Fe, and the granularity of described silicon strontium nucleating agent is 1.5mm.
Mass percent in described silicon strontium random inoculant shared by each component is: Si:75.5%, Sr:1.55%, Al:0.13%, Ca:0.09%, Mg:1.75%, and all the other are Fe, and the granularity of described silicon strontium random inoculant is 0.05mm.
Embodiment six
Present embodiments provide a kind of Mid-Si Mo Cast Iron, the mass percent shared by each component is: C:3.26%, Si:4.6%, Mn:0.3%, P:0.07%, S:0.02%, Mo:1%, Mg:0.042, surplus be Fe and inevitably trace element.
The production method of above-mentioned Mid-Si Mo Cast Iron, comprises the steps:
1) by good for the proportioning pig iron, foundry returns, steel scrap and molybdenum-iron proportionally, be placed into melting in medium-frequency induction furnace, after molten iron temperature reaches 1450 ~ 1480 DEG C, carry out slag making, skim, ensure that iron liquid is pure;
2) control molten iron tapping temperature at 1520 ~ 1540 DEG C, use electronic crane scale to sling to water and wrap in stove mouth and tap a blast furnace, weight of tapping a blast furnace is 490 ~ 510kg;
3) in casting ladle, add rare-earth magnesium series nodulizing agent and carry out spheroidizing, the nodulizing agent added is 1% of molten steel quality;
4) in casting ladle, add silicon strontium nucleating agent carry out inoculation, the silicon strontium nucleating agent added is 0.7% of molten steel quality;
5) control molten iron temperature to pour into a mould 1390 ~ 1430 DEG C time, in casting process, adopt silicon strontium random inoculant to carry out second time inoculation, the silicon strontium random inoculant added is 0.15% of molten steel quality.
Wherein, the mass percent in described rare-earth magnesium series nodulizing agent shared by each component is: Re:0.7 ~ 0.8%, Mg:5.5 ~ 6.5%, Ca:2 ~ 2.5%, Si:40 ~ 50%, Al:0.4 ~ 0.5%, Ba:2 ~ 2.3%, all the other are Fe, and the granularity of described rare-earth magnesium series nodulizing agent is 15mm.
Mass percent in described silicon strontium nucleating agent shared by each component is: Si:75.5%, Sr:1.55%, Al:0.13%, Ca:0.09%, and all the other are Fe, and the granularity of described silicon strontium nucleating agent is 7mm.
Mass percent in described silicon strontium random inoculant shared by each component is: Si:75.5%, Sr:1.55%, Al:0.13%, Ca:0.09%, Mg:1.75%, and all the other are Fe, and the granularity of described silicon strontium random inoculant is 0.25mm.
Embodiment seven
Present embodiments provide a kind of Mid-Si Mo Cast Iron, the mass percent shared by each component is: C:3.26%, Si:4.6%, Mn:0.3%, P:0.07%, S:0.02%, Mo:1%, Mg:0.042, surplus be Fe and inevitably trace element.
The production method of above-mentioned Mid-Si Mo Cast Iron, comprises the steps:
1) by good for the proportioning pig iron, foundry returns, steel scrap and molybdenum-iron proportionally, be placed into melting in medium-frequency induction furnace, after molten iron temperature reaches 1450 ~ 1480 DEG C, carry out slag making, skim, ensure that iron liquid is pure;
2) control molten iron tapping temperature at 1520 ~ 1540 DEG C, use electronic crane scale to sling to water and wrap in stove mouth and tap a blast furnace, weight of tapping a blast furnace is 490 ~ 510kg;
3) in casting ladle, add rare-earth magnesium series nodulizing agent and carry out spheroidizing, the nodulizing agent added is 1.2% of molten steel quality;
4) in casting ladle, add silicon strontium nucleating agent carry out inoculation, the silicon strontium nucleating agent added is 0.7% of molten steel quality;
5) control molten iron temperature to pour into a mould 1390 ~ 1430 DEG C time, in casting process, adopt silicon strontium random inoculant to carry out second time inoculation, the silicon strontium random inoculant added is 0.15% of molten steel quality.
Wherein, the mass percent in described rare-earth magnesium series nodulizing agent shared by each component is: Re:0.7 ~ 0.8%, Mg:5.5 ~ 6.5%, Ca:2 ~ 2.5%, Si:40 ~ 50%, Al:0.4 ~ 0.5%, Ba:2 ~ 2.3%, all the other are Fe, and the granularity of described rare-earth magnesium series nodulizing agent is 3mm.
Mass percent in described silicon strontium nucleating agent shared by each component is: Si:75.5%, Sr:1.55%, Al:0.13%, Ca:0.09%, and all the other are Fe, and the granularity of described silicon strontium nucleating agent is 1.5mm.
Mass percent in described silicon strontium random inoculant shared by each component is: Si:75.5%, Sr:1.55%, Al:0.13%, Ca:0.09%, Mg:1.75%, and all the other are Fe, and the granularity of described silicon strontium random inoculant is 0.05mm.
Embodiment eight
Present embodiments provide a kind of Mid-Si Mo Cast Iron, the mass percent shared by each component is: C:3.26%, Si:4.6%, Mn:0.3%, P:0.07%, S:0.02%, Mo:1%, Mg:0.042, surplus be Fe and inevitably trace element.
The production method of above-mentioned Mid-Si Mo Cast Iron, comprises the steps:
1) by good for the proportioning pig iron, foundry returns, steel scrap and molybdenum-iron proportionally, be placed into melting in medium-frequency induction furnace, after molten iron temperature reaches 1450 ~ 1480 DEG C, carry out slag making, skim, ensure that iron liquid is pure;
2) control molten iron tapping temperature at 1520 ~ 1540 DEG C, use electronic crane scale to sling to water and wrap in stove mouth and tap a blast furnace, weight of tapping a blast furnace is 490 ~ 510kg;
3) in casting ladle, add rare-earth magnesium series nodulizing agent and carry out spheroidizing, the nodulizing agent added is 1% of molten steel quality;
4) in casting ladle, add silicon strontium nucleating agent carry out inoculation, the silicon strontium nucleating agent added is 0.5% of molten steel quality;
5) control molten iron temperature to pour into a mould 1390 ~ 1430 DEG C time, in casting process, adopt silicon strontium random inoculant to carry out second time inoculation, the silicon strontium random inoculant added is 0.15% of molten steel quality.
Wherein, the mass percent in described rare-earth magnesium series nodulizing agent shared by each component is: Re:0.7 ~ 0.8%, Mg:5.5 ~ 6.5%, Ca:2 ~ 2.5%, Si:40 ~ 50%, Al:0.4 ~ 0.5%, Ba:2 ~ 2.3%, all the other are Fe, and the granularity of described rare-earth magnesium series nodulizing agent is 3mm.
Mass percent in described silicon strontium nucleating agent shared by each component is: Si:75.5%, Sr:1.55%, Al:0.13%, Ca:0.09%, and all the other are Fe, and the granularity of described silicon strontium nucleating agent is 1.5mm.
Mass percent in described silicon strontium random inoculant shared by each component is: Si:75.5%, Sr:1.55%, Al:0.13%, Ca:0.09%, Mg:1.75%, and all the other are Fe, and the granularity of described silicon strontium random inoculant is 0.05mm.
The Alloy Affecting Ductile Properties of embodiment one to embodiment eight is detected, draws following form:
In eight embodiments of the present invention, it is consistent that nucleating agent and the nodulizing agent of embodiment one to embodiment five add quantity, granularity remains on smaller value, by changing the per-cent of each component in nucleating agent and nodulizing agent, change the content of C, Si, Mo, Mg in spheroidal graphite cast iron, in embodiment four, the performance of spheroidal graphite cast iron is best, afterwards the per-cent of material is defined as to the material per-cent in embodiment four, change the granularity of nucleating agent and nodulizing agent, change the addition of nucleating agent and nodulizing agent, the performance of spheroidal graphite cast iron declines to some extent.
Upper table is known, the maximum tensile strength of the present invention can reach 690MPa, highest hardness is 256HB, meet the performance requriements of exhaust manifold, without chilling tendency in spheroidal graphite cast iron, graphite nuclei and quantity more, sphere diameter is less, be evenly distributed, form rounding, graphite grade is high, eutectic cell is fine and closely woven, the mechanical property of foundry goods is very outstanding.See in accompanying drawing, Fig. 2, for not adopt spheroidal graphite cast iron state of the present invention, can find out that its graphite nuclei is less, skewness with, form is imperfect; Fig. 1 is for adopting spheroidal graphite cast iron state of the present invention, and graphite nuclei is fine and closely woven complete, is evenly distributed, and quantity is more, and the grade of graphite is higher.
What finally illustrate is, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, other amendments that those of ordinary skill in the art make technical scheme of the present invention or equivalently to replace, only otherwise depart from the spirit and scope of technical solution of the present invention, all should be encompassed in the middle of right of the present invention.
Claims (9)
1. a Mid-Si Mo Cast Iron, is characterized in that: the mass percent shared by each component is: C:3.1 ~ 3.3%, Si:3 ~ 5%, Mn:0 ~ 0.3%, P:0 ~ 0.07%, S:0 ~ 0.02%, Mo:0.5 ~ 1.2%, Mg:0.025 ~ 0.045%, surplus be Fe and inevitably trace element.
2. a production method for Mid-Si Mo Cast Iron as claimed in claim 1, is characterized in that: comprise the steps:
1) by good for the proportioning pig iron, foundry returns, steel scrap and molybdenum-iron proportionally, be placed into melting in medium-frequency induction furnace, after molten iron temperature reaches 1450 ~ 1480 DEG C, carry out slag making, skim, ensure that iron liquid is pure;
2) control molten iron tapping temperature at 1500 ~ 1550 DEG C, use electronic crane scale to sling to water and wrap in stove mouth and tap a blast furnace, weight of tapping a blast furnace is 480 ~ 520kg;
3) in casting ladle, add rare-earth magnesium series nodulizing agent and carry out spheroidizing, the nodulizing agent added is 0.8 ~ 1.2% of molten steel quality;
4) in casting ladle, add silicon strontium nucleating agent carry out inoculation, the silicon strontium nucleating agent added is 0.5 ~ 0.8% of molten steel quality;
5) control molten iron temperature to pour into a mould 1360 ~ 1460 DEG C time, in casting process, adopt silicon strontium random inoculant to carry out second time inoculation, the silicon strontium random inoculant added is 0.1 ~ 0.2% of molten steel quality.
3. the production method of Mid-Si Mo Cast Iron as claimed in claim 2, it is characterized in that: the mass percent shared by the pig iron that in step 1), proportioning is good, foundry returns, steel scrap and molybdenum-iron is: the pig iron 20 ~ 30%, foundry returns 60 ~ 70%, steel scrap 5 ~ 10%, molybdenum-iron 0.4 ~ 0.6%.
4. the production method of Mid-Si Mo Cast Iron as claimed in claim 2, it is characterized in that: the mass percent in described rare-earth magnesium series nodulizing agent shared by each component is: Re:0.7 ~ 0.8%, Mg:5.5 ~ 6.5%, Ca:2 ~ 2.5%, Si:40 ~ 50%, Al:0.4 ~ 0.5%, Ba:2 ~ 2.3%, all the other are Fe.
5. the production method of Mid-Si Mo Cast Iron as claimed in claim 4, is characterized in that: the granularity of described rare-earth magnesium series nodulizing agent is 1 ~ 20mm.
6. the production method of Mid-Si Mo Cast Iron as claimed in claim 2, it is characterized in that: the mass percent in described silicon strontium nucleating agent shared by each component is: Si:75 ~ 76%, Sr:1.5 ~ 1.6%, Al:0.1 ~ 0.15%, Ca:0.08 ~ 0.1%, all the other are Fe.
7. the production method of Mid-Si Mo Cast Iron as claimed in claim 6, is characterized in that: the granularity of described silicon strontium nucleating agent is 0.8 ~ 10mm.
8. the production method of Mid-Si Mo Cast Iron as claimed in claim 2, it is characterized in that: the mass percent in described silicon strontium random inoculant shared by each component is: Si:75 ~ 76%, Sr:1.5 ~ 1.6%, Al:0.1 ~ 0.15%, Ca:0.08 ~ 0.1%, Mg:1.5 ~ 2%, all the other are Fe.
9. the production method of Mid-Si Mo Cast Iron as claimed in claim 8, is characterized in that: the granularity of described silicon strontium random inoculant is 0.03 ~ 0.3mm.
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| CN106011609B (en) * | 2016-07-29 | 2018-03-02 | 西峡县内燃机进排气管有限责任公司 | A kind of middle silicon molybdenum niobium ductile cast iron material and preparation method thereof |
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| CN108796359A (en) * | 2018-07-16 | 2018-11-13 | 佛山市高明康得球铁有限公司 | A kind of spheroidal graphite cast-iron of high-wear resistance |
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