CN103614612A - High-strength low stress cast nodular cast iron with high elasticity modulus and manufacturing method thereof - Google Patents
High-strength low stress cast nodular cast iron with high elasticity modulus and manufacturing method thereof Download PDFInfo
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Abstract
The invention discloses a high-strength low stress cast nodular cast iron with high elasticity modulus. The nodular cast iron comprises the following components by mass percent: 3.7-3.9% of C, 2.0-2.2% of Si, 4.50-4.65% of CE, 0.5-0.6% of Mn, less than or equal to 0.03% of P, less than or equal to 0.02% of S, 0.03-0.06% of Mg, 0.01-0.02% of RE, 0.5-0.7% of Cu, and 0.05-0.06% of Sn. A manufacture method of the nodular cast iron is characterized by high temperature pure iron liquid of base iron, compound alloying and accurate addition; according to the microscopic structure of the manufactured nodular cast iron, the content of pearlite is more than or equal to 95%, the nodularity is more than or equal to 90%, spherulitic graphite number in unit area is 200-380/mm<2>, the yield strength is over 400MPa, the strength of extension is over 700MPa, the elastic modulus is more than 170GPa, the hardness HB is 190-250, the elongation is more than 3%, the casting inner stress is less than or equal to 50MPa, namely, with high carbon equivalent and high silicon-carbon ratio, the nodular cast iron has excellent performances such as high strength, high elasticity modulus and low stress, thus meeting the technical requirement of casting of machine tools.
Description
Technical field
The present invention relates to spheroidal graphite cast iron, especially relate to a kind of high-strength high-elasticity modulus low-stress cast condition ductile iron of the foundry goods that is applicable to producing lathes, the invention still further relates to the manufacture method of this cast condition ductile iron.
Background technology
The development with large-size numerical control machine that improves constantly along with parts machining accuracy requirement, demand to large-scale precision lathe increases fast, also improved accounting for the requirement of the lathe casting quality of lathe weight 70 ~ 80%, nodular iron casting (as trade mark QT600-3, QT700-2) relies on the application of its excellent performance in large-scale, heavy machine tool more and more simultaneously.But the dimensional precision of lathe casting and retentivity thereof become the bottleneck that the high-grade numerically-controlled precise lathe of China is manufactured, and the distortion of foundry goods and poor dimensional stability have a strong impact on the precision of lathe casting and retentivity thereof.The rigidity of lathe is the key of machine tool accuracy retentivity, material rigidity and structural rigidity comprising foundry goods, and tensile strength and Young's modulus are two important performance indexes of reflection lathe casting material rigidity, in addition the unrelieved stress of lathe casting is also the important factor that affects machine tool accuracy and retentivity thereof, and the distortion causing because of the unrelieved stress of foundry goods even problems of crack is also one of common technology problem of casting industry.
The subject matter that the original technical scheme for spheroidal graphite cast iron lathe casting exists is: 1, carbon equivalent fluctuation large (being 4.00 ~ 4.60%) and unstable; 2, the higher and vary within wide limits (being 100 ~ 200MPa) of residual stress of casting, the serious casting deformation that causes even ftractures; 3, be difficult to reach high strength and high elastic coefficient simultaneously, general tensile strength approximately 600 MPa, Young's modulus is lower is 150GPa left and right, and domestic these performance index of Young's modulus of nearly all not controlling in castings production, seldom measures Young's modulus; While 4, casting, nodularization, inoculation treating method are more extensive, the general high rare-earth nodularizer of high magnesium that adopts of nodulizing agent, by pouring method or covering bag method, carry out spheroidizing, nucleating agent adopts 75# ferrosilicon more, and by breeding in wrapping and floating silicon breeds and carries out inoculation, nodulizing agent and innoculant adding quantity are large, specific absorption is low, and the foundry goods physical and chemical index obtaining is unstable.
Summary of the invention
The object of the present invention is to provide a kind of technical indicator can meet the high-strength high-elasticity modulus low-stress cast condition ductile iron of lathe casting requirement, the present invention also provides the manufacture method of this spheroidal graphite cast iron.
For achieving the above object, the present invention can take following technical proposals:
High-strength high-elasticity modulus low-stress cast condition ductile iron of the present invention, it is that one-tenth by following massfraction is grouped into:
C：3.7~3.9%；Si：2.0~2.2%；CE：4.50~4.65%；Mn：0.5~0.6%；P≤0.03%；S≤0.02%；Mg：0.03~0.06%；RE：0.01~0.02%；Cu：0.5~0.7%；Sn：0.05~0.06%。
The preparation method of described high-strength high-elasticity modulus low-stress cast condition ductile iron comprises the steps:
The first step, moulding: adopt phenolic sand molding, mold cavity surface brushing alcohol radical zirconium white coating or alcohol radical graphite paint;
Second step, preparation of raw material: by high-purity pig iron: the weight percent of carbon steel scrap=80 ~ 85%:15 ~ 20% takes raw material, wherein: the chemical composition of high-purity pig iron is: C:4.61%; Si:0.62%; Mn:0.08%; S:0.026%; P:0.011%; Ti:0.030%; The chemical composition of carbon steel scrap is: C:0.16%; Si:0.23%; Mn:0.44%; S:0.02%; P:0.027%;
The 3rd step, base iron melting: high-purity pig iron and carbon steel scrap are added to intermediate frequency furnace melting after 400 ℃ ± 10 ℃ baking preheatings, raw material adds 75# ferrosilicon after melting clearly and adjusts original iron melt silicon content to 1.0 ~ 1.2%, and iron liquid temperature of superheat is 1510 ~ 1520 ℃, then stirs, skims;
The 4th step, Alloying Treatment: press 1.05 ~ 1.36% of iron liquid gross weight and add particulate state alloy, alloying element and content are Mn:0.5 ~ 0.6%, Cu:0.5 ~ 0.7%, Sn:0.05 ~ 0.06% is come out of the stove while pouring casting ladle into and is added with stream at iron liquid after 400 ℃ ± 10 ℃ baking preheatings;
The 5th step, spheroidizing: when iron liquid temp is down to 1480 ~ 1500 ℃, adopts and feed silk nodulizing process, accurately add nodulizing agent by 1.3% of iron liquid gross weight, nodulizing agent is yttrium based heavy rare earths magnesium nodularization cored-wire;
The 6th step, inoculation: take high calcium barium nucleating agent, 0.1% by 1.0% of iron liquid gross weight respectively and take sulphur oxygen nucleating agent, after 400 ℃ ± 10 ℃ baking preheatings, high calcium barium nucleating agent breeds in being used for wrapping, sulphur oxygen nucleating agent adds with stream when cast;
The 7th step, cast: pour into a mould when iron liquid temp is down to 1350 ℃;
The 8th step, shake out cleaning: shake out when casting temperature is cooled to 150 ~ 250 ℃, obtains composition and consist of C:3.7 ~ 3.9%; Si:2.0 ~ 2.2%; CE:4.50 ~ 4.65%; Mn:0.5 ~ 0.6%; P≤0.03%; S≤0.02%; Mg:0.03 ~ 0.06%; RE:0.01 ~ 0.02%; Cu:0.5 ~ 0.7%; The spheroidal graphite cast iron of Sn:0.05 ~ 0.06%, the carbon equivalent of this spheroidal graphite cast iron is 4.50 ~ 4.65%, silicon carbon ratio is 0.50 ~ 0.60, tensile strength >=700MPa, Young's modulus >=170GPa, elongation >=3%, content of pearlite in alloy >=95%.
In described the 4th step, the granularity of particulate state alloy is 2 ~ 7mm.
In described the 5th step, the composition of yttrium based heavy rare earths magnesium nodularization cored-wire is: 40 ~ 44%Si, 28 ~ 30%Mg, 2.5 ~ 4%Y-RE (yttrium-base heavy rare earth), core material quality 200 ± 5 g/cm, heart yearn quality 360 ± 5 g/cm.
In described the 6th step, the composition of high calcium barium nucleating agent is: Si:72 ~ 78%, and Ca:1.0 ~ 2.0%, Ba:2.0 ~ 3.0%, Al <1.5%, granularity is 3 ~ 8mm; The composition of sulphur oxygen nucleating agent is: Si:70 ~ 76%, and Ce:1.5 ~ 2.0%, Ca:0.75 ~ 1.25%, Al:0.75 ~ 1.25%, S & O <1%, granularity is 0.2 ~ 0.7mm.
In the present invention, by selecting the high-purity pig iron of rational proportion and carbon steel scrap as raw material, can reduce the fluctuation range of carbon equivalent, and make carbon equivalent be stabilized in higher level (between 4.50 ~ 4.65%), silicon carbon ratio is controlled at 0.50 ~ 0.60 simultaneously: high C amount can promote greying, reduces chilling tendency; Si can increase and reinforced ferrite, refining eutectic group; Higher carbon equivalent can be improved the mobility of iron liquid, reduce the supercooling temperature of iron liquid, obtain the more and equally distributed globular graphite of quantity, thus increase that in eutectic process, graphitization expansion produces from feeding effect, reduce shrinkage porosite tendency and stress concentration, be conducive to reduce the unrelieved stress of foundry goods.By the composite alloying of Mn, Cu, Sn, process and can significantly improve content of pearlite in alloy, refine pearlite sheet interlayer spacing, strengthening matrix, significantly improve the mechanical properties such as the Young's modulus of as-cast ball iron and tensile strength, hardness, wherein: Mn can increase pearlitic stability; Cu energy promotion and refine pearlite, inhibition ferrite, have solution strengthening and precipitation hardening effect to matrix, can obviously improve tensile strength and Young's modulus; Sn can stablize and promote perlite strongly, improves intensity, hardness, homogeneity of structure and the wear resistance of cast iron; Composite alloying is processed and to be made magnesium iron under carbon equivalent high, obtain the high-intensity Young's modulus that simultaneously significantly improves, and makes tensile strength >=700MPa, Young's modulus >=170GPa, and elongation >=3%, content of pearlite in alloy >=95%, and improve the rigidity of magnesium iron material; Original technical scheme interalloy normally adds in stove with large bulk in fusion process, and manufacture method interalloy of the present invention is to pour at the iron liquid Shi Suiliu that comes out of the stove with granular form, can accurately add and be conducive to fast, fully absorbing and dispersed in iron liquid of alloying element, improve homogeneity of structure.The nodulizing process such as the relatively conventional method that pours, lid Bao Fa, in manufacture method of the present invention, feed silk nodulizing process and can accurately add nodulizing agent, improve nodulizing agent specific absorption, significantly improve nodularization effect, shorten spheroidizing to the timed interval of cast, prevent the decaying spheroidisation of heavy duty machine tools foundry goods, violent spheroidizing reacion has the effect of uniform stirring to iron liquid in addition, and alloy is uniformly distributed.By breeding the intensive inoculation combining with current-following inoculation in wrapping, process, obtain more the number of graphite, be conducive to improve Young's modulus, and improve homogeneity of structure, thereby reduce the graphite pebbles stress concentration of matrix around.Shakeout temperature is reduced to 150 ~ 250 ℃ from existing 300 ~ 400 ℃, can effectively reduce the casting internal stress of foundry goods.Adopt manufacture method of the present invention, can make the unrelieved stress of foundry goods be reduced to below 50MPa from 100 ~ 200MPa.
The characteristic of manufacture method of the present invention is " base iron iron liquid+composite alloying that high temperature is pure+accurately add ", and its technical measures are " carbon equivalent high, high silicon-carbon ratio+composite alloying+hello pompon+intensive inoculation+low temperature shake out "; The microstructure of resulting spheroidal graphite cast iron is: content of pearlite in alloy>=95%, and nodularization rate>=90%, 2 ~ 3 grades of nodulizing grades, 5 ~ 7 grades of graphite sizes, unit surface spheroidal graphite number is 200 ~ 380/mm
2, the graphite pebbles that rounding is tiny is evenly distributed on matrix; Mechanical property is: more than yield strength 400MPa, more than tensile strength 700MPa, more than Young's modulus 170GPa, hardness HB190 ~ 250, elongation more than 3%, is cast internal stress≤50MPa, has the excellent properties of high strength, high elastic coefficient and low-stress under carbon equivalent high, high silicon-carbon ratio simultaneously, can reach the quality standard of trade mark QT700-2 spheroidal graphite cast iron, meet the technical requirements of lathe casting.
Accompanying drawing explanation
Fig. 1 is the graphite picture of high-strength high-elasticity modulus low-stress cast condition ductile iron in embodiment 1.
Fig. 2 is the matrix picture of high-strength high-elasticity modulus low-stress cast condition ductile iron in embodiment 1.
Fig. 3 is " displacement-force " graphic representation during the mechanical property of high-strength high-elasticity modulus low-stress cast condition ductile iron in embodiment 1 detects.
Fig. 4 is " extensometer-Li " graphic representation during the mechanical property of high-strength high-elasticity modulus low-stress cast condition ductile iron in embodiment 1 detects.
Embodiment
embodiment 1:
Prepared composition consists of C:3.7%; Si:2.2%; CE:4.50%; Mn:0.5%; P≤0.03%; S≤0.02%; Mg:0.035%; RE:0.010%; Cu:0.5%; The spheroidal graphite cast iron of Sn:0.06%:
The first step, moulding: adopt phenolic sand molding, mold cavity surface brushing alcohol radical zirconium white coating;
Second step, preparation of raw material: the weight percent by high-purity pig iron: carbon steel scrap=80%:20% takes raw material, wherein: the chemical composition of high-purity pig iron is: C:4.61%; Si:0.62%; Mn:0.08%; S:0.026%; P:0.011%; Ti:0.030%; The chemical composition of carbon steel scrap is: C:0.16%; Si:0.23%; Mn:0.44%; S:0.02%; P:0.027%;
The 3rd step, base iron melting: high-purity pig iron and carbon steel scrap are added to intermediate frequency furnace melting after 400 ℃ ± 10 ℃ baking preheatings, and raw material adds 75# ferrosilicon after melting clearly and adjusts original iron melt silicon content to 1.2%, and iron liquid temperature of superheat is 1510 ℃, then stirs, skims;
The 4th step, Alloying Treatment: add by 1.06% of iron liquid gross weight the particulate state alloy that granularity is 2 ~ 7mm, alloying element and content are Mn:0.5%, Cu:0.5%, Sn:0.06% comes out of the stove while pouring casting ladle into and adds with stream at iron liquid after 400 ℃ ± 10 ℃ baking preheatings;
The 5th step, spheroidizing: when iron liquid temp is down to 1480 ℃, adopts and feed silk nodulizing process, accurately add nodulizing agent by 1.3% of iron liquid gross weight, nodulizing agent is yttrium based heavy rare earths magnesium nodularization cored-wire; Wherein the composition of yttrium based heavy rare earths magnesium nodularization cored-wire is: 40 ~ 44%Si, 28 ~ 30%Mg, 2.5 ~ 4%Y-RE (yttrium-base heavy rare earth), core material quality 200 ± 5 g/cm, heart yearn quality 360 ± 5 g/cm.
The 6th step, inoculation: take high calcium barium nucleating agent, 0.1% by 1.0% of iron liquid gross weight and take sulphur oxygen nucleating agent, after 400 ℃ ± 10 ℃ baking preheatings, high calcium barium nucleating agent breeds in being used for wrapping, sulphur oxygen nucleating agent adds with stream when cast; Wherein the composition of high calcium barium nucleating agent is: Si: 72 ~ 78%, Ca:1.0 ~ 2.0%, and Ba:2.0 ~ 3.0%, Al <1.5%, granularity is 3 ~ 8mm; The composition of sulphur oxygen nucleating agent is: Si:70 ~ 76%, and Ce:1.5 ~ 2.0%, Ca:0.75 ~ 1.25%, Al:0.75 ~ 1.25%, S & O <1%, granularity is 0.2 ~ 0.7mm;
The 7th step, cast: pour into a mould when solution temperature is down to 1350 ℃;
The 8th step, shake out cleaning: shake out when casting temperature is cooled to 250 ℃, Fig. 1, Fig. 2 are shown in the metallographic structure of gained spheroidal graphite cast iron, mechanical property detection curve is shown in Fig. 3, Fig. 4: nodularization rate 93%, 2 ~ 3 grades of nodulizing grades, 5 grades of graphite sizes, 205/mm of unit surface spheroidal graphite number
2content of pearlite in alloy 95%, yield strength 400MPa, tensile strength 702MPa, Young's modulus 172GPa, hardness HB198, elongation 5%, unrelieved stress 18.7 ~ 47.3MPa, reaches the capability and performance of trade mark QT700-2 spheroidal graphite cast iron, and there is the excellent properties of high strength, high elastic coefficient and low-stress simultaneously, can meet the technical requirements of lathe casting.
embodiment 2:
Prepared composition consists of C:3.8%; Si:2.1%; CE:4.55%; Mn:0.6%; P≤0.03%; S≤0.02%; Mg:0.04%; RE:0.014%; Cu:0.5%; The spheroidal graphite cast iron of Sn:0.06%:
The first step, moulding: adopt phenolic sand molding, mold cavity surface brushing alcohol radical graphite paint;
Second step, preparation of raw material: the weight percent by high-purity pig iron: carbon steel scrap=82%:18% takes raw material, wherein the chemical composition of high-purity pig iron used and the chemical composition of carbon steel scrap are with embodiment 1;
The 3rd step, base iron melting: high-purity pig iron and carbon steel scrap are entered to intermediate frequency furnace melting after 400 ℃ ± 10 ℃ baking preheatings, and raw material adds 75# ferrosilicon after melting clearly and adjusts original iron melt silicon content to 1.16%, and iron liquid temperature of superheat is 1514 ℃, then stirs, skims;
The 4th step, Alloying Treatment: add by 1.16% of iron liquid gross weight the particulate state alloy that granularity is 2 ~ 7mm, alloying element and content are Mn:0.6%, Cu:0.5%, Sn:0.06% comes out of the stove while pouring casting ladle into and adds with stream at iron liquid after 400 ℃ ± 10 ℃ baking preheatings;
The 5th step, spheroidizing: when iron liquid temp is down to 1488 ℃, adopts and feed silk nodulizing process, accurately add nodulizing agent by 1.3% of iron liquid gross weight, nodulizing agent is yttrium based heavy rare earths magnesium nodularization cored-wire; Wherein the composition of yttrium based heavy rare earths magnesium nodularization cored-wire is with embodiment 1;
The 6th step, inoculation: take high calcium barium nucleating agent, 0.1% by 1.0% of iron liquid gross weight and take sulphur oxygen nucleating agent, after 400 ℃ ± 10 ℃ baking preheatings, high calcium barium nucleating agent breeds in being used for wrapping, sulphur oxygen nucleating agent adds with stream when cast; The composition of high calcium barium nucleating agent and sulphur oxygen nucleating agent is with embodiment 1;
The 7th step, cast: pour into a mould when solution temperature is down to 1350 ℃;
The 8th step, shake out cleaning: shake out when casting temperature is cooled to 230 ℃, the metallographic structure of gained spheroidal graphite cast iron and mechanical property are: nodularization rate 90%, 2 ~ 3 grades of nodulizing grades, 6 grades of graphite sizes, 240/mm of unit surface spheroidal graphite number
2content of pearlite in alloy 97%, yield strength 408MPa, tensile strength 712MPa, Young's modulus 175GPa, hardness HB217, elongation 4%, unrelieved stress 20.9 ~ 41.5MPa, reaches the capability and performance of trade mark QT700-2 spheroidal graphite cast iron, and there is the excellent properties of high strength, high elastic coefficient and low-stress simultaneously, can meet the technical requirements of lathe casting.
embodiment 3:
Prepared composition consists of C:3.9%; Si:2.0%; CE:4.60%; Mn:0.5%; P≤0.03%; S≤0.02%; Mg:0.05%; RE:0.017%; Cu:0.6%; The spheroidal graphite cast iron of Sn:0.05%:
The first step, moulding: adopt phenolic sand molding, mold cavity surface brushing alcohol radical zirconium white coating;
Second step, preparation of raw material: the weight percent by high-purity pig iron: carbon steel scrap=84%:16% takes raw material, wherein the chemical composition of high-purity pig iron used and the chemical composition of carbon steel scrap are with embodiment 1;
The 3rd step, base iron melting: high-purity pig iron and carbon steel scrap are entered to intermediate frequency furnace melting after 400 ℃ ± 10 ℃ baking preheatings, and raw material adds 75# ferrosilicon after melting clearly and adjusts original iron melt silicon content to 1.0%, and iron liquid temperature of superheat is 1517 ℃, then stirs, skims;
The 4th step, Alloying Treatment: add by 1.15% of iron liquid gross weight the particulate state alloy that granularity is 2 ~ 7mm, alloying element and content are Mn:0.5%, Cu:0.6%, Sn:0.05% comes out of the stove while pouring casting ladle into and adds with stream at iron liquid after 400 ℃ ± 10 ℃ baking preheatings;
The 5th step, spheroidizing: when iron liquid temp is down to 1496 ℃, adopts and feed silk nodulizing process, accurately add nodulizing agent by 1.3% of iron liquid gross weight, nodulizing agent is yttrium based heavy rare earths magnesium nodularization cored-wire; Wherein the composition of yttrium based heavy rare earths magnesium nodularization cored-wire is with embodiment 1;
The 6th step, inoculation: take high calcium barium nucleating agent, 0.1% by 1.0% of iron liquid gross weight and take sulphur oxygen nucleating agent, after 400 ℃ ± 10 ℃ baking preheatings, high calcium barium nucleating agent breeds in being used for wrapping, sulphur oxygen nucleating agent adds with stream when cast; The composition of high calcium barium nucleating agent and sulphur oxygen nucleating agent is with embodiment 1;
The 7th step, cast: pour into a mould when solution temperature is down to 1350 ℃; ;
The 8th step, shake out cleaning: shake out when casting temperature is cooled to 200 ℃, the metallographic structure of gained spheroidal graphite cast iron and mechanical property are: nodularization rate 95%, 2 ~ 3 grades of nodulizing grades, 6 grades of graphite sizes, 320/mm of unit surface spheroidal graphite number
2content of pearlite in alloy 98%, yield strength 413MPa, tensile strength 739MPa, Young's modulus 176GPa, hardness HB235, elongation 4%, unrelieved stress 25.0 ~ 35.4MPa, reaches the capability and performance of trade mark QT700-2 spheroidal graphite cast iron, and there is the excellent properties of high strength, high elastic coefficient and low-stress simultaneously, can meet the technical requirements of lathe casting.
embodiment 4:
Prepared composition consists of C:3.9%; Si:2.2%; CE:4.65%; Mn:0.6%; P≤0.03%; S≤0.02%; Mg:0.06%; RE:0.02%; Cu:0.7%; The spheroidal graphite cast iron of Sn:0.05%:
The first step, moulding: adopt phenolic sand molding, mold cavity surface brushing alcohol radical graphite paint;
Second step, preparation of raw material: the weight percent by high-purity pig iron: carbon steel scrap=85%:15% takes raw material, wherein the chemical composition of high-purity pig iron used and the chemical composition of carbon steel scrap are with embodiment 1;
The 3rd step, base iron melting: high-purity pig iron and carbon steel scrap are entered to intermediate frequency furnace melting after 400 ℃ ± 10 ℃ baking preheatings, and raw material adds 75# ferrosilicon after melting clearly and adjusts original iron melt silicon content to 1.18%, and iron liquid temperature of superheat is 1520 ℃, then stirs, skims;
The 4th step, Alloying Treatment: add by 1.35% of iron liquid gross weight the particulate state alloy that granularity is 2 ~ 7mm, alloying element and content are Mn:0.6%, Cu:0.7%, Sn:0.05% comes out of the stove while pouring casting ladle into and adds with stream at iron liquid after 400 ℃ ± 10 ℃ baking preheatings;
The 5th step, spheroidizing: when iron liquid temp is down to 1500 ℃, adopts and feed silk nodulizing process, accurately add nodulizing agent by 1.3% of iron liquid gross weight, nodulizing agent is yttrium based heavy rare earths magnesium nodularization cored-wire; Wherein the composition of yttrium based heavy rare earths magnesium nodularization cored-wire is with embodiment 1;
The 6th step, inoculation: take high calcium barium nucleating agent, 0.1% by 1.0% of high-purity pig iron and carbon steel scrap raw material gross weight and take sulphur oxygen nucleating agent, after 400 ℃ ± 10 ℃ baking preheatings, high calcium barium nucleating agent breeds in being used for wrapping, sulphur oxygen nucleating agent adds with stream when cast; The composition of high calcium barium nucleating agent and sulphur oxygen nucleating agent is with embodiment 1;
The 7th step, cast: pour into a mould when solution temperature is down to 1350 ℃; ;
The 8th step, shake out cleaning: shake out when casting temperature is cooled to 150 ℃, the metallographic structure of gained spheroidal graphite cast iron and mechanical property are: nodularization rate 91%, 2 ~ 3 grades of nodulizing grades, 7 grades of graphite sizes, 380/mm of unit surface spheroidal graphite number
2content of pearlite in alloy 99%, yield strength 440MPa, tensile strength 750MPa, Young's modulus 182GPa, hardness HB249, elongation 3%, unrelieved stress 13.7 ~ 33.4MPa, reaches the capability and performance of trade mark QT700-2 spheroidal graphite cast iron, and there is the excellent properties of high strength, high elastic coefficient and low-stress simultaneously, can meet the technical requirements of lathe casting.
Claims (5)
1. a high-strength high-elasticity modulus low-stress cast condition ductile iron, is characterized in that it is that one-tenth by following massfraction is grouped into:
C：3.7~3.9%；Si：2.0~2.2%；CE：4.50~4.65%；Mn：0.5~0.6%；P≤0.03%；S≤0.02%；Mg：0.03~0.06%；RE：0.01~0.02%；Cu：0.5~0.7%；Sn：?0.05~0.06%。
2. the preparation method of high-strength high-elasticity modulus low-stress cast condition ductile iron according to claim 1, is characterized in that comprising the steps:
The first step, moulding: adopt phenolic sand molding, mold cavity surface brushing alcohol radical zirconium white coating or alcohol radical graphite paint;
Second step, preparation of raw material: by high-purity pig iron: the weight percent of carbon steel scrap=80 ~ 85%:15 ~ 20% takes raw material, wherein: the chemical composition of high-purity pig iron is: C:4.61%; Si:0.62%; Mn:0.08%; S:0.026%; P:0.011%; Ti:0.030%; The chemical composition of carbon steel scrap is: C:0.16%; Si:0.23%; Mn:0.44%; S:0.02%; P:0.027%;
The 3rd step, base iron melting: high-purity pig iron and carbon steel scrap are added to intermediate frequency furnace melting after 400 ℃ ± 10 ℃ baking preheatings, raw material adds 75# ferrosilicon after melting clearly and adjusts original iron melt silicon content to 1.0 ~ 1.2%, and iron liquid temperature of superheat is 1510 ~ 1520 ℃, then stirs, skims;
The 4th step, Alloying Treatment: press 1.05 ~ 1.36% of iron liquid gross weight and add particulate state alloy, alloying element and content are Mn:0.5 ~ 0.6%, Cu:0.5 ~ 0.7%, Sn:0.05 ~ 0.06% is come out of the stove while pouring casting ladle into and is added with stream at iron liquid after 400 ℃ ± 10 ℃ baking preheatings;
The 5th step, spheroidizing: when iron liquid temp is down to 1480 ~ 1500 ℃, adopts and feed silk nodulizing process, accurately add nodulizing agent by 1.3% of iron liquid gross weight, nodulizing agent is yttrium based heavy rare earths magnesium nodularization cored-wire;
The 6th step, inoculation: take high calcium barium nucleating agent, 0.1% by 1.0% of iron liquid gross weight respectively and take sulphur oxygen nucleating agent, after 400 ℃ ± 10 ℃ baking preheatings, high calcium barium nucleating agent breeds in being used for wrapping, sulphur oxygen nucleating agent adds with stream when cast;
The 7th step, cast: pour into a mould when iron liquid temp is down to 1350 ℃;
The 8th step, shake out cleaning: shake out when casting temperature is cooled to 150 ~ 250 ℃, obtains composition and consist of C:3.7 ~ 3.9%; Si:2.0 ~ 2.2%; CE:4.50 ~ 4.65%; Mn:0.5 ~ 0.6%; P≤0.03%; S≤0.02%; Mg:0.03 ~ 0.06%; RE:0.01 ~ 0.02%; Cu:0.5 ~ 0.7%; The spheroidal graphite cast iron of Sn:0.05 ~ 0.06%, the carbon equivalent of this spheroidal graphite cast iron is 4.50 ~ 4.65%, silicon carbon ratio is 0.50 ~ 0.60, tensile strength >=700MPa, Young's modulus >=170GPa, elongation >=3%, content of pearlite in alloy >=95%.
3. the preparation method of high-strength high-elasticity modulus low-stress cast condition ductile iron according to claim 2, is characterized in that: in described the 4th step, the granularity of particulate state alloy is 2 ~ 7mm.
4. the preparation method of high-strength high-elasticity modulus low-stress cast condition ductile iron according to claim 2, it is characterized in that: in described the 5th step, the composition of yttrium based heavy rare earths magnesium nodularization cored-wire is: 40 ~ 44%Si, 28 ~ 30%Mg, 2.5 ~ 4% Y-RE, core material quality 200 ± 5 g/cm, heart yearn quality 360 ± 5 g/cm.
5. the preparation method of high-strength high-elasticity modulus low-stress cast condition ductile iron according to claim 2, it is characterized in that: in described the 6th step, the composition of high calcium barium nucleating agent is: Si: 72 ~ 78%, Ca:1.0 ~ 2.0%, Ba:2.0 ~ 3.0%, Al <1.5%, granularity is 3 ~ 8mm; The composition of sulphur oxygen nucleating agent is: Si:70 ~ 76%, and Ce:1.5 ~ 2.0%, Ca:0.75 ~ 1.25%, Al:0.75 ~ 1.25%, S & O <1%, granularity is 0.2 ~ 0.7mm.
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| CN103981320A (en) * | 2014-05-16 | 2014-08-13 | 天润曲轴股份有限公司 | Production process and production method for base iron melt eutectic nodular iron |
| CN104561754A (en) * | 2014-12-31 | 2015-04-29 | 铜陵市经纬流体科技有限公司 | Soft-seal brake valve body of spheroidal graphite cast iron and preparing method of soft-seal brake valve body |
| CN104561431A (en) * | 2014-12-26 | 2015-04-29 | 宁夏共享装备有限公司 | Production method of spheroidal graphite cast iron with thick large section |
| CN104894466A (en) * | 2015-06-03 | 2015-09-09 | 郑州机械研究所 | High-strength, high-elasticity modulus and low-stress gray cast iron and manufacturing method thereof |
| CN104975124A (en) * | 2015-06-27 | 2015-10-14 | 芜湖市容川机电科技有限公司 | Auxiliary material used for production of nodular cast iron QT600-3 |
| CN106811676A (en) * | 2017-01-04 | 2017-06-09 | 山东汇金股份有限公司 | A kind of high-intensity high-tenacity as cast condition QT700 10 and its production method |
| CN107532225A (en) * | 2015-05-18 | 2018-01-02 | 东芝机械株式会社 | Iron metal liquation processing method |
| CN108330384A (en) * | 2018-02-08 | 2018-07-27 | 东风商用车有限公司 | Heavy commercial vehicle brake drum material with high strength and high thermal fatigue performance |
| CN108588545A (en) * | 2018-03-19 | 2018-09-28 | 河北硕凯铸造有限公司 | A kind of GGG70L spheroidal graphite cast-iron and preparation method thereof |
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| CN109576566A (en) * | 2019-01-29 | 2019-04-05 | 南京裕源铸件制造有限公司 | High temperature resistant furnace cast pearlite ductile iron and its production method |
| CN110129665A (en) * | 2019-06-11 | 2019-08-16 | 东风商用车有限公司 | As-cast state sand casting niobium-containing high-strength high-toughness nodular cast iron material and preparation method thereof |
| CN110394427A (en) * | 2019-08-28 | 2019-11-01 | 安徽普瑞明精密机械有限公司 | The preparation process of cold shut defect is prevented in a kind of production of ductile cast iron manhole cover |
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| CN103981320A (en) * | 2014-05-16 | 2014-08-13 | 天润曲轴股份有限公司 | Production process and production method for base iron melt eutectic nodular iron |
| CN104561431A (en) * | 2014-12-26 | 2015-04-29 | 宁夏共享装备有限公司 | Production method of spheroidal graphite cast iron with thick large section |
| CN104561754A (en) * | 2014-12-31 | 2015-04-29 | 铜陵市经纬流体科技有限公司 | Soft-seal brake valve body of spheroidal graphite cast iron and preparing method of soft-seal brake valve body |
| CN107532225A (en) * | 2015-05-18 | 2018-01-02 | 东芝机械株式会社 | Iron metal liquation processing method |
| US20180148805A1 (en) * | 2015-05-18 | 2018-05-31 | Toshiba Kikai Kabushiki Kaisha | Method for treating molten cast iron |
| CN107532225B (en) * | 2015-05-18 | 2020-10-23 | 东芝机械株式会社 | Molten cast iron treatment method |
| CN104894466A (en) * | 2015-06-03 | 2015-09-09 | 郑州机械研究所 | High-strength, high-elasticity modulus and low-stress gray cast iron and manufacturing method thereof |
| CN104975124A (en) * | 2015-06-27 | 2015-10-14 | 芜湖市容川机电科技有限公司 | Auxiliary material used for production of nodular cast iron QT600-3 |
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| CN108588545B (en) * | 2018-03-19 | 2019-09-13 | 河北硕凯铸造有限公司 | A kind of GGG70L spheroidal graphite cast-iron and preparation method thereof |
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| CN108866427A (en) * | 2018-07-19 | 2018-11-23 | 郑州机械研究所有限公司 | The manufacturing method of large section low-temperature high-toughness Ferrite nodular iron casting |
| CN109576566A (en) * | 2019-01-29 | 2019-04-05 | 南京裕源铸件制造有限公司 | High temperature resistant furnace cast pearlite ductile iron and its production method |
| CN111748722A (en) * | 2019-03-26 | 2020-10-09 | 陕西重型汽车有限公司 | Nodular cast iron and preparation method thereof |
| CN110129665A (en) * | 2019-06-11 | 2019-08-16 | 东风商用车有限公司 | As-cast state sand casting niobium-containing high-strength high-toughness nodular cast iron material and preparation method thereof |
| CN110394427A (en) * | 2019-08-28 | 2019-11-01 | 安徽普瑞明精密机械有限公司 | The preparation process of cold shut defect is prevented in a kind of production of ductile cast iron manhole cover |
| CN110512054A (en) * | 2019-09-25 | 2019-11-29 | 郑州机械研究所有限公司 | The manufacturing method of numerically-controlled machine tool wearable ductile iron line rail |
| CN113088804A (en) * | 2021-05-19 | 2021-07-09 | 太原市三高能源发展有限公司 | Cast high-strength ductile iron and manufacturing method thereof |
| CN114021067A (en) * | 2021-11-04 | 2022-02-08 | 湖州鼎盛机械制造有限公司 | Method for quickly determining molten iron composition window for producing high-quality ductile iron castings |
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