CN104120332A - High-strength high-toughness ductile cast iron 600-10 and production method thereof - Google Patents
High-strength high-toughness ductile cast iron 600-10 and production method thereof Download PDFInfo
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Abstract
The invention discloses a high-strength high-toughness ductile cast iron 600-10 and belongs to the technical field of cast iron metallurgy. The high-strength high-toughness ductile cast iron 600-10 comprises the following elements in percentages by mass: 3.48%-3.7% of C, 2.5%-2.7% of Si, 0.7%-1.0% of Mn, 0.019%-0.04% of P, 0.009%-0.02% of S, 0.054%-0.0648% of the sum of the rare earth elements, 0.04%-0.05% of Mg and the balance of Fe and unavoidable trace elements. The invention also discloses a production method of the high-strength high-toughness ductile cast iron 600-10. The high-strength high-toughness ductile cast iron 600-10 disclosed by the invention has the advantages of high strength and good toughness, the high-strength high-toughness ductile cast iron 600-10 is easily shaped and has other characteristics and the casting process is simple.
Description
Technical field
The present invention relates to cast iron metallurgical technology field, relate in particular to a kind of spheroidal graphite cast iron.
Background technology
Spheroidal graphite cast iron is to obtain globular graphite by nodularization and inoculation, and it has improved the mechanical property of cast iron effectively, has particularly improved plasticity and toughness, thereby obtains than carbon steel high intensity also.Spheroidal graphite cast iron is 20th century a kind of meehanite cast iron materials of growing up of the fifties, and its over-all properties, close to steel, just based on its excellent performance, has been successfully used to cast some stressed complexity, the part that intensity, toughness, wear resistance are had relatively high expectations.
The production technique of traditional case of transmission is by the cutting of the blanking of steel alloy sheet material, tubing and piece together and many production technique such as be welded to form and jointly complete, consume a large amount of manpower and materials and time, cause the amplification of equipment cost raising and the device space and weight of equipment.At present, adopt spheroidal graphite cast iron technique to replace during welding for steel structure technique more, extremely harsh to casting material form to solve Molten Steel Flow, be difficult for forming product problem.But intensity and the toughness of traditional spheroidal graphite cast iron are poor.Therefore, a kind of high-intensity high-tenacity spheroidal graphite cast iron is needed research and development badly.
Summary of the invention
According to the intensity of traditional spheroidal graphite cast iron of above-mentioned proposition and the poor technical problem of toughness, and provide a kind of high-intensity high-tenacity spheroidal graphite cast iron 600-10 and production technique thereof.The technique means that the present invention adopts is as follows:
A high-intensity high-tenacity spheroidal graphite cast iron 600-10, each element mass percent of described high-intensity high-tenacity spheroidal graphite cast iron 600-10 is:
C:3.48%-3.7%, when the mass percent of C is lower than 3.48% time, product is softer, does not reach required performance requriements, and when the mass percent of C is higher than 3.7% time, product is really up to the mark, is unfavorable for processing;
Si:2.5%-2.7%, Si plays the effect of softening spheroidal graphite cast iron in spheroidal graphite cast iron, and when the mass percent of Si is lower than 2.5% time, product is really up to the mark, is unfavorable for processing, and when the mass percent of Si is higher than 2.7%, product is excessively soft;
Mn:0.7%-1.0%, when the mass percent of Mn is lower than 0.7% time, the hardness of product is low, and when the mass percent of Mn is higher than 1.0% time, product easily produces ardent;
P:0.019%-0.04%, P is harmful element, can not promote greying, should reduce as much as possible the mass percent of P, when the mass percent of P is higher than 0.04% time, product easily occurs ardent, and cementite can transform and form in ferrite and ball light body, when foundry goods cementite is greater than 0.15%, be to cause workpiece to produce constructive variations in temperature difference situation, thereby affect mechanical work-ing life;
S:0.009%-0.02%, S is harmful element, can stop greying,, should reduce as much as possible the mass percent of S, when the mass percent of S is higher than 0.02% time, product easily produces stress concentration, and cementite can transform and form in ferrite and ball light body, when foundry goods cementite, being greater than 0.15% is to cause workpiece in temperature difference situation, to produce constructive variations, thus impact machinery work-ing life;
Σ RE:0.054%-0.0648%, when the mass percent of Σ RE is lower than 0.054% time, the nodularization rate of product is lower than 70%, the unstable properties of product, when the mass percent of Σ RE is higher than 0.0648% time, product easily produces hot tearing;
Mg:0.04%-0.05%, when the mass percent of Mg is lower than 0.04% time, the nodularization rate of product is lower than 70%, the unstable properties of product, when the mass percent of Mg is higher than 0.05% time, product easily produces hot tearing;
Surplus is Fe and inevitably micro-.
Further, each element mass percent of described high-intensity high-tenacity spheroidal graphite cast iron 600-10 is: C:3.54%, Si:2.5%, Mn:0.96%, P:0.033%, S:0.009%, Σ RE:0.054%, Mg:0.049%, surplus is Fe and inevitably micro-.
Further, each element mass percent of described high-intensity high-tenacity spheroidal graphite cast iron 600-10 is: C:3.48%, Si:2.5%, Mn:0.7%, P:0.019%, S:0.009%, Σ RE:0.054%, Mg:0.04%, surplus is Fe and inevitably micro-.
Further, each element mass percent of described high-intensity high-tenacity spheroidal graphite cast iron 600-10 is: C:3.6%, Si:2.6%, Mn:0.85%, P:0.03%, S:0.015%, Σ RE:0.0594%, Mg:0.045%, surplus is Fe and inevitably micro-.
Further, each element mass percent of described high-intensity high-tenacity spheroidal graphite cast iron 600-10 is: C:3.7%, Si:2.7%, Mn:1.0%, P:0.04%, S:0.02%, Σ RE:0.0648%, Mg:0.05%, surplus is Fe and inevitably micro-.
A production technique of high-intensity high-tenacity spheroidal graphite cast iron 600-10, has following steps:
S1: burden process, the raw material adopting comprises the Q12 pig iron, foundry returns, steel scrap, ferrosilicon, ferromanganese, nodulizing agent and nucleating agent, its proportioning is as follows: the Q12 pig iron: 65%-75%, foundry returns: 10%-20%, steel scrap: 10%-20%, ferrosilicon: 0.8%-1.0%, ferromanganese: 0.8-1.0%, nodulizing agent: 1%-3%, nucleating agent: 0.01%-0.04%, promotes whitening element and tension-active element in order to stablize chemical composition and effectively to control, guarantee the quality of melt iron, and select the Q12 pig iron of high-carbon content low silicon content;
S2: melting operation, takes the Q12 pig iron by the proportioning in step S1, foundry returns and steel scrap; Start smelting furnace power supply, furnace temperature adds the Q12 pig iron and heats to Q12 fusing point while rising to 400 ℃; Add afterwards steel scrap and foundry returns and be warming up to 1400 ℃; Adopt metallic element stokehold spectrum analyzer to detect metal ingredient in stove, according to detected result, select to add the ratio of ferrosilicon and ferromanganese, and continue to be warming up to 1450 ℃, the key that spheroidizing reacion is controlled is the specific absorption of magnesium, and nodularization temperature is high, and reaction is fierce, time is short, and magnesium scaling loss is many, nodularization weak effect; Nodularization temperature is low, reacting balance, and the time is long, and magnesium absorption rate is high, and nodularization is effective.Therefore, generally guaranteeing, under the prerequisite of enough teeming temperatures, should to reduce as far as possible spheroidization treatment temperature, nodularization temperature of the present invention is controlled at 1450 ℃;
S3: nodularization, inoculation, takes nodulizing agent, the granularity of described nodulizing agent is 5-25mm, and nodulizing agent is placed in the nodulizing agent groove that nodularization bag bag is low, covers the nucleating agent taking on nodulizing agent, the granularity of described nucleating agent is 5-25mm, and iron is cut and covered uniformly on nucleating agent and tamping; The iron liquid of melting in step S2 is poured in described nodularization bag, when the iron liquid liquid level pouring into reach described nodularization bag height 55% time stop iron liquid and pour into, after 15s, continue to pour into iron liquid until full bag, complete nodularization, inoculation, stokehold adopts analyser to detect carbon and silicon equivalent and nodularization rate, and qualified rear is pourable;
In order to improve the specific absorption of nodulizing agent, increase nodularization effect, spheroidizing bag should be than general iron liquid Bao Shen;
Nodulizing agent and nucleating agent will add in nodularization bag before tapping a blast furnace, and when producing continuously, have just gone out after last stove iron, and nodularization bag is awfully hot, add too early nodulizing agent and nucleating agent can make it be bonded in the bag end and weaken nodularization and pregnant effect.In order to postpone the spheroidizing reacion time, guarantee the combustion reaction time of nodulizing agent, strengthen nodularization and pregnant effect, cover at nodulizing agent with above nucleating agent one deck iron filings.
S4: casting operation, complete after nodularization, inoculation, in 5min-10min, complete the cast of foundry goods, because decaying spheroidisation easily appears in magnesium iron liquid, therefore, iron liquid spheroidization and inoculation will be poured into a mould after processing as early as possible, avoids producing decaying spheroidisation;
S5: heat treatment step, the foundry goods obtaining in step S4 is heat-treated: 560 ℃ ± 10 ℃ of annealing temperatures, insulation 3h furnace cooling, when near 200 ℃ of furnace temperature, the foundry goods naturally cooling of can coming out of the stove, cast triangle style and complete heat treatment step after do Performance Detection.
Further, each element mass percent of described steel scrap is: C:0.17%-0.23%, and Si:0.17%-0.37%, Mn:0.35%-0.37%, P :≤0.035%, S :≤0.035%, surplus is Fe and inevitably micro-.
Further, described nodulizing agent is FeSiMg8Re7 rare earth ferrosilicomagnesium nodulizing agent, its each element mass percent is: Mg:7.0%-9.0%, Σ Re:6.0%-8.0%, Si:35.0%-44.0%, Ca :≤4.0%, Mn :≤4.0%, Al :≤0.5%, Ti :≤1.0%, surplus is Fe and inevitably micro-, adopt the reason of FeSiMg8Re7 rare earth ferrosilicomagnesium nodulizing agent to be, while producing due to electric furnace, temperature is relatively high, during spheroidizing, reaction is more violent, because silicon content in described nodulizing agent is higher, can significantly reduce the severe degree of reacting when magnesium is processed, simultaneously because the increase of the content of silicon can produce certain inoculation(effect).
Further, described nucleating agent is FeSi75 ferrosilicon nucleating agent, and its each element mass percent is: Si:74%-79%, Ca:0.5%-1%:, Al:0.8%-1.6%, surplus is Fe and inevitably micro-, inoculation is an important step in spheroidal graphite cast iron production process, it not only promotes greying, prevents that free cementite and spoken parts in traditional operas from occurring, and contributes to nodularization, and make graphite become more tiny, more rounding, is evenly distributed, thereby improves the mechanical property of spheroidal graphite cast iron.
Further, the height of described nodularization bag is 2:1 with diameter ratio.
Compared with prior art, the beneficial effect that the present invention has is:
To spheroidal graphite cast iron 600-10 of the present invention, according to GB/T20123-2006, GB/T223, GB/T228.1-2010 and GB/T9441-2009 standard detect, its various technical indicators are as follows: tensile strength 600MPa-700MPa, yield strength: 400MPa-450MPa, unit elongation: 10.0%-12.0%, nodularization rate: 85%-90%, graphite size: seven grades.
The present invention can extensively promote in fields such as cast iron metallurgical technology field for the foregoing reasons.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail.
Embodiment mono-
High-intensity high-tenacity spheroidal graphite cast iron 600-10 in embodiment mono-makes by following steps:
S1: burden process, the raw material of employing comprises the Q12 pig iron, foundry returns, steel scrap, ferrosilicon, ferromanganese, nodulizing agent and nucleating agent, its proportioning is as follows: the Q12 pig iron: 66%, foundry returns: 16.3%, steel scrap: 14%, ferrosilicon: 0.9%, ferromanganese: 1%, nodulizing agent: 1.76%, nucleating agent: 0.04%;
S2: melting operation, takes the Q12 pig iron by the proportioning in S1, foundry returns and steel scrap; Start medium-frequency induction furnace power supply, furnace temperature adds the Q12 pig iron and heats to Q12 fusing point while rising to 400 ℃; Add afterwards steel scrap and foundry returns and be warming up to 1400 ℃; Adopt metallic element stokehold spectrum analyzer to detect metal ingredient in stove, according to the ferrosilicon of detected result interpolation 0.9% and 1% ferromanganese, and continue to be warming up to 1450 ℃;
S3: nodularization, inoculation, adopts the nodularization bag that holds 1000kg iron liquid, and the height of described nodularization bag is 2:1 with diameter ratio;
Take nodulizing agent, the granularity of described nodulizing agent is 5mm, nodulizing agent is placed in the nodulizing agent groove that nodularization bag bag is low, on nodulizing agent, cover the nucleating agent taking, the granularity of described nucleating agent is 5mm, thickness 45mm iron is cut and covered uniformly on nucleating agent and tamping, and the thickness that described iron is cut is according to the size of described nodularization bag and fixed; The iron liquid of above-mentioned melting is poured in described nodularization bag, when the iron liquid liquid level pouring into reach described nodularization bag height 55% time stop iron liquid and pour into, after 15s, continue to pour into iron liquid until full bag, complete nodularization, inoculation, stokehold adopts analyser to detect carbon and silicon equivalent and nodularization rate, and qualified rear is pourable;
S4: casting operation, complete after nodularization, inoculation, in 8min, complete the cast of foundry goods, after being cooled to room temperature, foundry goods carries out heat treatment step;
S5: heat treatment step, the foundry goods obtaining in step S4 is heat-treated: 560 ℃ ± 10 ℃ of annealing temperatures, insulation 3h furnace cooling, when near 200 ℃ of furnace temperature, the foundry goods naturally cooling of can coming out of the stove.
Each element mass percent of the described Q12 pig iron is: C:4.31%, and Si:1%, Mn:0.1%, P:0.04%, S:0.02%, surplus is Fe and inevitably micro-.
Each element mass percent of described foundry returns is: C:3.6%, and Si:2.55%, Mn:0.81%, S:0.018%, P:0.029%, surplus is Fe and inevitably micro-.
Each element mass percent of described steel scrap is: C:0.23%, and Si:0.17%, Mn:0.35%, P:0.035%, S:0.035%, surplus is Fe and inevitably micro-.
Each element mass percent of described ferrosilicon is: C:0.031%, and Si:75.73%, Mn:0.14%, S:0.005%, P:0.029%, surplus is Fe and inevitably micro-.
Each element mass percent of described ferromanganese is: C:1.98%, and Si:1.82%, Mn:75.21%, S:0.027%, P:0.32%, surplus is Fe and inevitably micro-.
Described nodulizing agent is FeSiMg8Re7 rare earth ferrosilicomagnesium nodulizing agent, and its each element mass percent is: Mg:7.0%, Σ Re:6.0%, Si:35.0%, Ca:4.0%, Mn:4.0%, Al:0.5%, Ti:1.0%, surplus is Fe and inevitably micro-.
Described nucleating agent is FeSi75 ferrosilicon nucleating agent, and its each element mass percent is: Si:74%, and Ca:0.5%, Al:0.8%, surplus is Fe and inevitably micro-.
Embodiment bis-
High-intensity high-tenacity spheroidal graphite cast iron 600-10 in embodiment bis-makes by following steps:
S1: burden process, the raw material of employing comprises the Q12 pig iron, foundry returns, steel scrap, ferrosilicon, ferromanganese, nodulizing agent and nucleating agent, its proportioning is as follows: the Q12 pig iron: 65%, and foundry returns: 15.56%, steel scrap: 15.57%, ferrosilicon: 0.87%, ferromanganese: 1%, nodulizing agent: 1.96%, nucleating agent: 0.04%;
S2: melting operation, takes the Q12 pig iron by the proportioning in S1, foundry returns and steel scrap; Start medium-frequency induction furnace power supply, furnace temperature adds the Q12 pig iron and heats to Q12 fusing point while rising to 400 ℃; Add afterwards steel scrap and foundry returns and be warming up to 1400 ℃; Adopt metallic element stokehold spectrum analyzer to detect metal ingredient in stove, according to the ferrosilicon of detected result interpolation 0.87% and 1% ferromanganese, and continue to be warming up to 1450 ℃;
S3: nodularization, inoculation, adopts the nodularization bag that holds 1000kg iron liquid, and the height of described nodularization bag is 2:1 with diameter ratio;
Take nodulizing agent, the granularity of described nodulizing agent is 5mm, nodulizing agent is placed in the nodulizing agent groove that nodularization bag bag is low, on nodulizing agent, cover the nucleating agent taking, the granularity of described nucleating agent is 5mm, thickness 45mm iron is cut and covered uniformly on nucleating agent and tamping, and the thickness that described iron is cut is according to the size of described nodularization bag and fixed; The iron liquid of above-mentioned melting is poured in described nodularization bag, when the iron liquid liquid level pouring into reach described nodularization bag height 55% time stop iron liquid and pour into, after 15s, continue to pour into iron liquid until full bag, complete nodularization, inoculation, stokehold adopts analyser to detect carbon and silicon equivalent and nodularization rate, and qualified rear is pourable;
S4: casting operation, complete after nodularization, inoculation, in 8min, complete the cast of foundry goods, after being cooled to room temperature, foundry goods carries out heat treatment step;
S5: heat treatment step, the foundry goods obtaining in step S4 is heat-treated: 560 ℃ ± 10 ℃ of annealing temperatures, insulation 3h furnace cooling, when near 200 ℃ of furnace temperature, the foundry goods naturally cooling of can coming out of the stove.
Each element mass percent of the described Q12 pig iron is: C:4.31%, and Si:1%, Mn:0.1%, P:0.04%, S:0.02%, surplus is Fe and inevitably micro-.
Each element mass percent of described foundry returns is: C:3.6%, and Si:2.55%, Mn:0.81%, S:0.018%, P:0.029%, surplus is Fe and inevitably micro-.
Each element mass percent of described steel scrap is: C:0.23%, and Si:0.17%, Mn:0.35%, P:0.035%, S:0.035%, surplus is Fe and inevitably micro-.
Each element mass percent of described ferrosilicon is: C:0.031%, and Si:75.73%, Mn:0.14%, S:0.005%, P:0.029%, surplus is Fe and inevitably micro-.
Each element mass percent of described ferromanganese is: C:1.98%, and Si:1.82%, Mn:75.21%, S:0.027%, P:0.32%, surplus is Fe and inevitably micro-.
Described nodulizing agent is FeSiMg8Re7 rare earth ferrosilicomagnesium nodulizing agent, and its each element mass percent is: Mg:7.0%, Σ Re:6.0%, Si:35.0%, Ca:4.0%, Mn:4.0%, Al:0.5%, Ti:1.0%, surplus is Fe and inevitably micro-.
Described nucleating agent is FeSi75 ferrosilicon nucleating agent, and its each element mass percent is: Si:74%, and Ca:0.5%, Al:0.8%, surplus is Fe and inevitably micro-.
Embodiment tri-
High-intensity high-tenacity spheroidal graphite cast iron 600-10 in embodiment tri-makes by following steps:
S1: burden process, the raw material of employing comprises the Q12 pig iron, foundry returns, steel scrap, ferrosilicon, ferromanganese, nodulizing agent and nucleating agent, its proportioning is as follows: the Q12 pig iron: 68%, and foundry returns: 17.05%, steel scrap: 11.06%, ferrosilicon: 0.9%, ferromanganese: 1%, nodulizing agent: 1.95%, nucleating agent: 0.04%;
S2: melting operation, takes the Q12 pig iron by the proportioning in S1, foundry returns and steel scrap; Start medium-frequency induction furnace power supply, furnace temperature adds the Q12 pig iron and heats to Q12 fusing point while rising to 400 ℃; Add afterwards steel scrap and foundry returns and be warming up to 1400 ℃; Adopt metallic element stokehold spectrum analyzer to detect metal ingredient in stove, according to the ferrosilicon of detected result interpolation 0.9% and 1% ferromanganese, and continue to be warming up to 1450 ℃;
S3: nodularization, inoculation, adopts the nodularization bag that holds 1000kg iron liquid, and the height of described nodularization bag is 2:1 with diameter ratio;
Take nodulizing agent, the granularity of described nodulizing agent is 5mm, nodulizing agent is placed in the nodulizing agent groove that nodularization bag bag is low, on nodulizing agent, cover the nucleating agent taking, the granularity of described nucleating agent is 5mm, thickness 45mm iron is cut and covered uniformly on nucleating agent and tamping, and the thickness that described iron is cut is according to the size of described nodularization bag and fixed; The iron liquid of above-mentioned melting is poured in described nodularization bag, when the iron liquid liquid level pouring into reach described nodularization bag height 55% time stop iron liquid and pour into, after 15s, continue to pour into iron liquid until full bag, complete nodularization, inoculation, stokehold adopts analyser to detect carbon and silicon equivalent and nodularization rate, and qualified rear is pourable;
S4: casting operation, complete after nodularization, inoculation, in 8min, complete the cast of foundry goods, after being cooled to room temperature, foundry goods carries out heat treatment step;
S5: heat treatment step, the foundry goods obtaining in step S4 is heat-treated: 560 ℃ ± 10 ℃ of annealing temperatures, insulation 3h furnace cooling, when near 200 ℃ of furnace temperature, the foundry goods naturally cooling of can coming out of the stove.
Each element mass percent of the described Q12 pig iron is: C:4.31%, and Si:1%, Mn:0.1%, P:0.04%, S:0.02%, surplus is Fe and inevitably micro-.
Each element mass percent of described foundry returns is: C:3.6%, and Si:2.55%, Mn:0.81%, S:0.018%, P:0.029%, surplus is Fe and inevitably micro-.
Each element mass percent of described steel scrap is: C:0.23%, and Si:0.17%, Mn:0.35%, P:0.035%, S:0.035%, surplus is Fe and inevitably micro-.
Each element mass percent of described ferrosilicon is: C:0.031%, and Si:75.73%, Mn:0.14%, S:0.005%, P:0.029%, surplus is Fe and inevitably micro-.
Each element mass percent of described ferromanganese is: C:1.98%, and Si:1.82%, Mn:75.21%, S:0.027%, P:0.32%, surplus is Fe and inevitably micro-.
Described nodulizing agent is FeSiMg8Re7 rare earth ferrosilicomagnesium nodulizing agent, and its each element mass percent is: Mg:7.0%, Σ Re:6.0%, Si:35.0%, Ca:4.0%, Mn:4.0%, Al:0.5%, Ti:1.0%, surplus is Fe and inevitably micro-.
Described nucleating agent is FeSi75 ferrosilicon nucleating agent, and its each element mass percent is: Si:74%, and Ca:0.5%, Al:0.8%, surplus is Fe and inevitably micro-.
Embodiment tetra-
High-intensity high-tenacity spheroidal graphite cast iron 600-10 in embodiment tetra-makes by following steps:
S1: burden process, the raw material of employing comprises the Q12 pig iron, foundry returns, steel scrap, ferrosilicon, ferromanganese, nodulizing agent and nucleating agent, its proportioning is as follows: the Q12 pig iron: 67%, and foundry returns: 17.86%, steel scrap: 11.5%, ferrosilicon: 0.8%, ferromanganese: 0.9%, nodulizing agent: 1.90%, nucleating agent: 0.04%;
S2: melting operation, takes the Q12 pig iron by the proportioning in S1, foundry returns and steel scrap; Start medium-frequency induction furnace power supply, furnace temperature adds the Q12 pig iron and heats to Q12 fusing point while rising to 400 ℃; Add afterwards steel scrap and foundry returns and be warming up to 1400 ℃; Adopt metallic element stokehold spectrum analyzer to detect metal ingredient in stove, according to the ferrosilicon of detected result interpolation 0.4% and 0.3% ferromanganese, and continue to be warming up to 1450 ℃;
S3: nodularization, inoculation, adopts the nodularization bag that holds 1000kg iron liquid, and the height of described nodularization bag is 2:1 with diameter ratio;
Take nodulizing agent, the granularity of described nodulizing agent is 5mm, nodulizing agent is placed in the nodulizing agent groove that nodularization bag bag is low, on nodulizing agent, cover the nucleating agent taking, the granularity of described nucleating agent is 5mm, thickness 45mm iron is cut and covered uniformly on nucleating agent and tamping, and the thickness that described iron is cut is according to the size of described nodularization bag and fixed; The iron liquid of above-mentioned melting is poured in described nodularization bag, when the iron liquid liquid level pouring into reach described nodularization bag height 55% time stop iron liquid and pour into, after 15s, continue to pour into iron liquid until full bag, complete nodularization, inoculation, stokehold adopts analyser to detect carbon and silicon equivalent and nodularization rate, and qualified rear is pourable;
S4: casting operation, complete after nodularization, inoculation, in 8min, complete the cast of foundry goods, after being cooled to room temperature, foundry goods carries out heat treatment step;
S5: heat treatment step, the foundry goods obtaining in step S4 is heat-treated: 560 ℃ ± 10 ℃ of annealing temperatures, insulation 3h furnace cooling, when near 200 ℃ of furnace temperature, the foundry goods naturally cooling of can coming out of the stove.
Each element mass percent of the described Q12 pig iron is: C:4.31%, and Si:1%, Mn:0.1%, P:0.04%, S:0.02%, surplus is Fe and inevitably micro-.
Each element mass percent of described foundry returns is: C:3.6%, and Si:2.55%, Mn:0.81%, S:0.018%, P:0.029%, surplus is Fe and inevitably micro-.
Each element mass percent of described steel scrap is: C:0.23%, and Si:0.17%, Mn:0.35%, P:0.035%, S:0.035%, surplus is Fe and inevitably micro-.
Each element mass percent of described ferrosilicon is: C:0.031%, and Si:75.73%, Mn:0.14%, S:0.005%, P:0.029%, surplus is Fe and inevitably micro-.
Each element mass percent of described ferromanganese is: C:1.98%, and Si:1.82%, Mn:75.21%, S:0.027%, P:0.32%, surplus is Fe and inevitably micro-.
Described nodulizing agent is FeSiMg8Re7 rare earth ferrosilicomagnesium nodulizing agent, and its each element mass percent is: Mg:7.0%, Σ Re:6.0%, Si:35.0%, Ca:4.0%, Mn:4.0%, Al:0.5%, Ti:1.0%, surplus is Fe and inevitably micro-.
Described nucleating agent is FeSi75 ferrosilicon nucleating agent, and its each element mass percent is: Si:74%, and Ca:0.5%, Al:0.8%, surplus is Fe and inevitably micro-.
High-intensity high-tenacity spheroidal graphite cast iron 600-10 in the embodiment mono-to embodiment tetra-making by above-mentioned preparation method, its each element mass percent as shown in Table 1, its performance and metallographic test result as shown in Table 2:
Table one
Table two
Known by above-mentioned test result, high-intensity high-tenacity spheroidal graphite cast iron 600-10 of the present invention has high strength, and high tenacity and higher nodularization rate are particularly suitable for the foundry goods of the device mould of some high-intensity high-tenacities, for example case of transmission.
Main chemical elements symbol and title that the present invention uses are explained as follows: C: carbon, Si: silicon, Mn: manganese, P: phosphorus, S: sulphur, Al: aluminium, Fe: iron, Ca: calcium, Ti: titanium, Mg: magnesium; Re: full name is Rare Earth, refers to rare earth element, rare earth element be in the periodic table of elements lanthanon and with the closely-related scandium of lanthanon (Sc) element and yttrium (Y) element.
The above; it is only preferably embodiment of the present invention; but protection scope of the present invention is not limited to this; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses; according to technical scheme of the present invention and inventive concept thereof, be equal to replacement or changed, within all should being encompassed in protection scope of the present invention.
Claims (10)
1. a high-intensity high-tenacity spheroidal graphite cast iron 600-10, it is characterized in that: each element mass percent of described high-intensity high-tenacity spheroidal graphite cast iron 600-10 is: C:3.48%-3.7%, Si:2.5%-2.7%, Mn:0.7%-1.0%, P:0.019%-0.04%, S:0.009%-0.02%, Σ RE:0.054%-0.0648%, Mg:0.04%-0.05%, surplus is Fe and inevitably micro-.
2. a kind of high-intensity high-tenacity spheroidal graphite cast iron 600-10 according to claim 1, it is characterized in that: each element mass percent of described high-intensity high-tenacity spheroidal graphite cast iron 600-10 is: C:3.54%, Si:2.5%, Mn:0.96%, P:0.033%, S:0.009%, Σ RE:0.054%, Mg:0.049%, surplus is Fe and inevitably micro-.
3. a kind of high-intensity high-tenacity spheroidal graphite cast iron 600-10 according to claim 1, it is characterized in that: each element mass percent of described high-intensity high-tenacity spheroidal graphite cast iron 600-10 is: C:3.48%, Si:2.5%, Mn:0.7%, P:0.019%, S:0.009%, Σ RE:0.054%, Mg:0.04%, surplus is Fe and inevitably micro-.
4. a kind of high-intensity high-tenacity spheroidal graphite cast iron 600-10 according to claim 1, it is characterized in that: each element mass percent of described high-intensity high-tenacity spheroidal graphite cast iron 600-10 is: C:3.6%, Si:2.6%, Mn:0.85%, P:0.03%, S:0.015%, Σ RE:0.0594%, Mg:0.045%, surplus is Fe and inevitably micro-.
5. a kind of high-intensity high-tenacity spheroidal graphite cast iron 600-10 according to claim 1, it is characterized in that: each element mass percent of described high-intensity high-tenacity spheroidal graphite cast iron 600-10 is: C:3.7%, Si:2.7%, Mn:1.0%, P:0.04%, S:0.02%, Σ RE:0.0648%, Mg:0.05%, surplus is Fe and inevitably micro-.
6. a production technique of producing a kind of high-intensity high-tenacity spheroidal graphite cast iron 600-10 described in arbitrary claim in claim 1 to 5, is characterized in that having following steps:
S1: burden process, the raw material of employing comprises the Q12 pig iron, foundry returns, steel scrap, ferrosilicon, ferromanganese, nodulizing agent and nucleating agent, its proportioning is as follows: the Q12 pig iron: 65%-75%, foundry returns: 10%-20%, steel scrap: 10%-20%, ferrosilicon: 0.8%-1.0%, ferromanganese: 0.8-1.0%, nodulizing agent: 1%-3%, nucleating agent: 0.01%-0.04%;
S2: melting operation, takes the Q12 pig iron by the proportioning in step S1, foundry returns and steel scrap; Start smelting furnace power supply, furnace temperature adds the Q12 pig iron and heats to Q12 fusing point while rising to 400 ℃; Add afterwards steel scrap and foundry returns and be warming up to 1400 ℃; Adopt metallic element stokehold spectrum analyzer to detect metal ingredient in stove, according to detected result, select to add the ratio of ferrosilicon and ferromanganese, and continue to be warming up to 1450 ℃;
S3: nodularization, inoculation, takes nodulizing agent, the granularity of described nodulizing agent is 5-25mm, and nodulizing agent is placed in the nodulizing agent groove that nodularization bag bag is low, covers the nucleating agent taking on nodulizing agent, the granularity of described nucleating agent is 5-25mm, and iron is cut and covered uniformly on nucleating agent and tamping; The iron liquid of melting in step S2 is poured in described nodularization bag, when the iron liquid liquid level pouring into reach described nodularization bag height 55% time stop iron liquid and pour into, after 15s, continue to pour into iron liquid until full bag, complete nodularization, inoculation, stokehold adopts analyser to detect carbon and silicon equivalent and nodularization rate, and qualified rear is pourable;
S4: casting operation, complete after nodularization, inoculation, in 5min-10min, complete the cast of foundry goods;
S5: heat treatment step, the foundry goods obtaining in step S4 is heat-treated: 560 ℃ ± 10 ℃ of annealing temperatures, insulation 3h furnace cooling, when near 200 ℃ of furnace temperature, the foundry goods naturally cooling of can coming out of the stove.
7. production technique according to claim 6, it is characterized in that: each element mass percent of described steel scrap is: C:0.17%-0.23%, Si:0.17%-0.37%, Mn:0.35%-0.37%, P :≤0.035%, S :≤0.035%, surplus is Fe and inevitably micro-.
8. production technique according to claim 6, it is characterized in that: described nodulizing agent is FeSiMg8Re7 rare earth ferrosilicomagnesium nodulizing agent, its each element mass percent is: Mg:7.0%-9.0%, Σ Re:6.0%-8.0%, Si:35.0%-44.0%, Ca :≤4.0%, Mn :≤4.0%, Al :≤0.5%, Ti :≤1.0%, surplus is Fe and inevitably micro-.
9. production technique according to claim 6, it is characterized in that: described nucleating agent is FeSi75 ferrosilicon nucleating agent, its each element mass percent is: Si:74%-79%, and Ca:0.5%-1%:, Al:0.8%-1.6%, surplus is Fe and inevitably micro-.
10. production technique according to claim 6, is characterized in that: the height of described nodularization bag is 2:1 with diameter ratio.
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