CN107974611A - A kind of full smelting scrap steel casting QT900-5 spheroidal graphite cast-iron and its production technology - Google Patents
A kind of full smelting scrap steel casting QT900-5 spheroidal graphite cast-iron and its production technology Download PDFInfo
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- CN107974611A CN107974611A CN201711234230.4A CN201711234230A CN107974611A CN 107974611 A CN107974611 A CN 107974611A CN 201711234230 A CN201711234230 A CN 201711234230A CN 107974611 A CN107974611 A CN 107974611A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/10—Cast-iron alloys containing aluminium or silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/08—Making cast-iron alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/04—Cast-iron alloys containing spheroidal graphite
Abstract
The invention discloses a kind of full smelting scrap steel casting 5 spheroidal graphite cast-iron of QT900 and its production technology, processing step includes dispensing, melting, spheroidization and inoculation, cast and heat treatment step, full steel scrap material is packaged into block before melting, graphitization carburant and steel scrap are added in fusion process in batches, graphitization carburant is added before water outlet again, inovulant is repeatedly added in whole process, obtaining each component content of 5 spheroidal graphite cast-iron of QT900 is：C：3.4~3.7%、Si：1.9~2.3%、Mn：0.4 ~ 0.6%, S ＜ 0.03%, P ＜ 0.05%, Cu：0.5~1%、Mg：0.3~0.6%、RE：0.01~0.04%.The present invention utilizes full smelting scrap steel spheroidal graphite cast-iron, 1 ~ 3 grade of nodulizing grade, 5 ~ 8 grades of graphite size, and ensure that the mechanical performance and intensity requirement of spheroidal graphite cast-iron, while greatly reduces the production cost of spheroidal graphite cast-iron.
Description
Technical field
The present invention relates to a kind of spheroidal graphite cast-iron, and in particular to a kind of full smelting scrap steel casting QT900-5 spheroidal graphite cast-iron and its
Production technology, belongs to cast iron metallurgical technology field.
Background technology
With the raising of casting industry cost of labor, foundry iron price is doubled and redoubled（At present 3250 yuan of pig iron price/
Ton）, the cost price for casting spheroidal graphite cast-iron reaches 6800 yuan/ton, and steel scrap price progressively declines（Clean steel scrap >=6mm is
1760 yuan/ton）.Be changed to middle frequency furnace from furnace cupola with smelting furnace using steel scrap casting spheroidal graphite cast-iron casting, in stove molten iron into
Point controllability higher, control for C carbon components in molten iron by using carburant carburetting, the control of Si silicon components by using
Foundry returns regulates and controls component requirements with 75 ferrosilicon of increase.It is perfect with the continuous maturation of full smelting scrap steel technology, casting at present
The cost price of spheroidal graphite cast-iron is 5200 yuan/ton, which need to there are certain requirements steel scrap material type, and steel scrap is preferably
Carbon plate material, wherein the element for hindering nodularization should not be contained（Low-sulfur, low-phosphorous, low manganese etc.）, other alloy steel materials do not allow
Using.
Currently with the high trade mark QT900-5 bent axles of smelting scrap steel spheroidal graphite cast-iron, the addition of steel scrap for 80% ~ 90%, 10% ~
20% foundry returns, the carbon C components that need to be supplemented are calculated according to the phosphorus content in steel scrap and foundry returns；Using through high-temperature calcination stone
Inkization carburant is layered in the middle and lower part of electric furnace and adds, while calculates the silicon Si components in electric furnace, passes through light after the completion of melting
Spectrometer measures carbon C, silicon Si, manganese Mn, sulphur S, the phosphorus P components of electric furnace molten iron, adds ferromanganese Mn according to the data of spectrum analysis, finally
The mass percentage content of magnesium iron component is controlled in carbon C3.7% ~ 3.9%, silicon Si1.9% ~ 2.2%, manganese Mn0.35% ~ 0.55%, sulphur S
＜ 0.03%, phosphorus P ＜ 0.05%, magnesium Mg are residual 0.04% ~ 0.06%, rare earth Re residual 0.01% ~ 0.02%.
But above-mentioned technology still has several drawbacks, such as slower for the speed of melting of full steel scrap plate material, fusion process is held
The continuous requirement for having higher to the smelting temperature of electric furnace using carburant, the furnace lining material loss to electric furnace are larger.In addition using complete
The high trade mark G. Iron Castings of smelting scrap steel are also not carried out producing in enormous quantities, and saving space is huge on overall manufacturing cost, because
The high trade mark G. Iron Castings technical meaning of full smelting scrap steel of this present invention is great.
The content of the invention
The technical problem of solution：In view of the deficiencies of the prior art, the present invention provides a kind of full smelting scrap steel to cast
QT900-5 spheroidal graphite cast-iron and its production technology, block is packaged into by full steel scrap material, is made before water outlet in fusion process and in batches
With graphitization carburant, inovulant is used for multiple times in whole process, ensures the performance of spheroidal graphite cast-iron, reduces production cost.
Technical solution：A kind of full smelting scrap steel casting QT900-5 spheroidal graphite cast-iron provided by the invention, each composition quality percentage
It is than content：C：3.4%~3.7%、Si：1.9%~2.3%、Mn：0.4% ~ 0.6%, S ＜ 0.03%, P ＜ 0.05%, Cu：0.5%~1%、
Mg：0.3%~0.6%、RE：0.01%~0.04%.
The production technology of full smelting scrap steel casting QT900-5 spheroidal graphite cast-iron provided by the invention, it includes following technique step
Suddenly：
（1）Dispensing：Content consists of the following compositions molten iron smelting raw material by mass percentage：Steel scrap 75% ~ 80%, foundry returns 10% ~
20%th, graphitization carburant 3.6% ~ 4%, ferromanganese 0.15%-1%；
（2）Melting：It is integral that chunky shape steel scrap and iron plate are first put into cuber internal pressure by melting before starting, according to step（1）'s
Raw material proportioning is first added 1% ~ 1.5% packed steel scrap or foundry returns and is quickly dissolved, to ensure that EAF bottom has molten iron；Then
According to raw material proportioning by the average stove of addition in batches of graphitization carburant and steel scrap, each feed way is first to be added into stove
Graphitization carburant, adding packed steel scrap will swim in the graphitization carburant press-in molten iron above molten iron；All
After the completion of charging, 1 ~ 2h of melting is kept the temperature at 1400 DEG C ~ 1450 DEG C, then does metal in spectrum analysis detection stove using copper mold sampling
Component, is added in ferromanganese and foundry returns to stove according to testing result, and the mass percentage content for ensureing each component in molten iron is：C：
3.6%~3.9%、Si：0.9%~1.2%、Mn：0.4% ~ 0.6%, S ＜ 0.03%, P ＜ 0.05%, by gained molten iron be warming up to 1550 DEG C ~
1600 DEG C of insulations carry out purification in 2 ~ 3 minutes and take off Slag treatment；
（3）Spheroidization and inoculation：The nodulizer that molten iron gross mass 1.3% ~ 1.5% is first added into spheroidization molten iron bag is clapped compacting, then
An inovulant for covering molten iron gross mass 1.5% ~ 1.8% above is clapped, then molten iron gross mass is covered on an inovulant
1.5 ~ 1.8% iron filings or steel beans compacting, then pours step into nodularization bag（2）Gained molten iron carries out spheroidization and inoculation processing, goes out
Add the powdery graphite carburant of molten iron gross mass 0.05% ~ 0.06% during water into nodularization bag again, reach ball in water yield
The post inoculant of molten iron gross mass 0.05% ~ 0.06% is added when changing the 2/3 of bag, water outlet presses stokehold components tests result before completing
Suitable copper is added, the mass percentage content for ensureing each component in molten iron is：C:3.4%~3.7%、Si：1.9%~2.3%、Mn：
0.4% ~ 0.6%, S ＜ 0.03%, P ＜ 0.05%, Cu：0.5~1%、Mg：0.3%~0.6%、RE：0.01%~0.04%；
（4）Cast：Molten iron pours completely to be completed nodularization, is poured into a mould after inoculation, adds molten iron gross mass with stream during cast
0.1% ~ 0.2% random inoculant, cannot interrupt in casting process, unpack after casting complete in 15 minutes, overturn sandbox
Casting is taken out；
（5）Heat treatment：Turn heat treatment department after casting completes cooling, normalizing, insulation temperature are carried out using the box normalizing furnace of trolley
Spend for 910 DEG C ± 10 DEG C, soaking time is 3 ~ 3.5h, and it is cold to turn mist immediately after unpacking, and until being cooled to room temperature, that is, obtains full steel scrap
Melting and casting QT900-5 spheroidal graphite cast-iron.
The steel scrap is carbon steel, and C content is 0.1% ~ 0.2%.Each composition quality percentage composition of graphitization carburant
For：C >=98%, S ＜ 0.05, N ＜ 0.03.The trade mark of the nodulizer is FeSiMg6RE1.Inovulant and secondary pregnant
It is 75 ferrosilicon to educate agent, and grain fineness is 3mm ~ 8mm.The random inoculant is 75 ferrosilicon, and fineness is 0.2 ~ 0.8mm.Step
（3）The fineness of the powdery graphite carburant is 0.5 ~ 1mm.
Beneficial effect：（1）The present invention utilizes unified carbon steel through electro-smelting, by continuous in fusion process
Carburetting, ensures the carbon component requirement finally required.When using full smelting scrap steel because molten iron high melt and smelting time compared with
It is long, it is unfavorable for making spheroidal graphite cast-iron, so increasing graphite using the mode of Multi inoculation in operation
Ball number, while in order to ensure the nucleation ability of inside, the graphitization powder carburant of 0.5-1mm is added before water outlet in molten iron
Bao Zhong, to ensure the number of graphite of cast-internal.
（2）At the same time during benefit carbon is carried out using carburant, the absorption of carburant is also more crucial step, is increased
Carbon agent adds the middle and lower part of electric furnace, allows it sufficiently to dissolve and absorb, and selects the graphitization carburant that low-sulfur, low nitrogen easily absorb to carry out
Carburetting, if selected for the carburant without calcining, the carbon molecules in molten iron cannot will eventually be reacted to by uniform pickup
Cast-internal, there are the graphite form of bulky grain, directly influences the roughness and properties of product of product, while low carbon absorption
Rate is also the waste in a kind of cost.Adjusted by the cooperation to Mn contents and Cu contents, using the mode of Multi inoculation, ensured
Effect after casting nodularization, the cast properties for ensureing finally to require by normalizing heat treatment.
（3）Using bundled scrap equipment, chunky shape steel scrap and iron plate are put into cuber, with oil pressure by steel scrap and iron plate
One is pressed into, shows steel scrap block structure, speed of melting can be accelerated, such as whole packed smelting scrap steel 5T molten iron are altogether
It is time-consuming 1 it is small when, the smelting scrap steel 5T molten iron without packing altogether time-consuming 2 it is small when, greatly reduce production cost.
（4）The present invention utilizes full smelting scrap steel spheroidal graphite cast-iron, ensure that the form and quantity of graphite nodule, nodulizing grade can expire
For foot at 1 ~ 3 grade, 5 ~ 8 grades of graphite size, ensure that the mechanical performance and intensity requirement of spheroidal graphite cast-iron QT900-5, while significantly drop
The low production cost of spheroidal graphite cast-iron.
Brief description of the drawings
Fig. 1 ~ 4 are respectively the fractograph of 1 ~ 4 gained spheroidal graphite cast-iron product of embodiment.
Embodiment
The present invention is further illustrated below by the mode of embodiment, but therefore protection scope of the present invention is not confined to
Following embodiments, but limited by description and claims of this specification.
Embodiment 1
（1）Dispensing：Content consists of the following compositions molten iron smelting raw material by mass percentage：Steel scrap 75%, foundry returns 20%, graphite
Change carburant 4%, ferromanganese 1%；
（2）Melting：It is integral that chunky shape steel scrap and iron plate are first put into cuber internal pressure by melting before starting, according to step（1）'s
Raw material proportioning is first added 1% packed steel scrap or foundry returns and is quickly dissolved, to ensure that EAF bottom has molten iron；Then according to
For raw material proportioning by the average stove of addition in batches of graphitization carburant and steel scrap, each feed way is that graphite is first added into stove
Change carburant, adding packed steel scrap will swim in the graphitization carburant press-in molten iron above molten iron；All chargings
After the completion of, melting 1h is kept the temperature at 1400 DEG C, then metal ingredient in spectrum analysis detection stove is done using copper mold sampling, according to detection
As a result add in ferromanganese and foundry returns to stove, the mass percentage content for ensureing each component in molten iron is：C：3.6%~3.9%、Si：
0.9%~1.2%、Mn：0.4% ~ 0.6%, S ＜ 0.03%, P ＜ 0.05%, 1550 DEG C ~ 1600 DEG C insulations 2 ~ 3 are warming up to by gained molten iron
Minute carries out purification and takes off Slag treatment；
（3）Spheroidization and inoculation：The nodulizer that molten iron gross mass 1.3% is first added into spheroidization molten iron bag is clapped compacting, then is covered above
Inovulant of top iron and screw water gross mass 1.5% is clapped, then cover on an inovulant molten iron gross mass 1.5% iron filings or
Steel beans are tamped, and then pour step into nodularization bag（2）Gained molten iron carries out spheroidization and inoculation processing, during water outlet again into nodularization bag
The powdery graphite carburant of molten iron gross mass 0.05% is added, the total matter of molten iron is added when water yield reaches the 2/3 of nodularization bag
The post inoculant of amount 0.05%, water outlet press stokehold components tests result before completing and add suitable copper, ensure each component in molten iron
Mass percentage content be：C:3.4%~3.7%、Si：1.9%~2.3%、Mn：0.4% ~ 0.6%, S ＜ 0.03%, P ＜ 0.05%,
Cu：0.5~1%、Mg：0.3%~0.6%、RE：0.01%~0.04%；
（4）Cast：Molten iron pours completely to be completed nodularization, is poured into a mould after inoculation, adds molten iron gross mass with stream during cast
0.1% ~ 0.2% random inoculant, cannot interrupt in casting process, unpack after casting complete in 15 minutes, overturn sandbox
Casting is taken out；
（5）Heat treatment：Turn heat treatment department after casting completes cooling, normalizing, insulation temperature are carried out using the box normalizing furnace of trolley
Spend for 910 DEG C, soaking time 3h, it is cold to turn mist immediately after unpacking, and until being cooled to room temperature, that is, obtains full smelting scrap steel casting
QT900-5 spheroidal graphite cast-iron.
Embodiment 2
（1）Dispensing：Content consists of the following compositions molten iron smelting raw material by mass percentage：Steel scrap 78%, foundry returns 17.3%, stone
Inkization carburant 3.8%, ferromanganese 0.9%；
（2）Melting：It is integral that chunky shape steel scrap and iron plate are first put into cuber internal pressure by melting before starting, according to step（1）'s
Raw material proportioning is first added 1.4% packed steel scrap or foundry returns and is quickly dissolved, to ensure that EAF bottom has molten iron；Then press
According to raw material proportioning by the average stove of addition in batches of graphitization carburant and steel scrap, each feed way is that stone is first added into stove
Inkization carburant, adding packed steel scrap will swim in the graphitization carburant press-in molten iron above molten iron；All add
After the completion of material, melting 1.5h is kept the temperature at 1430 DEG C, then does metal ingredient in spectrum analysis detection stove using copper mold sampling, according to
Testing result is added in ferromanganese and foundry returns to stove, and the mass percentage content for ensureing each component in molten iron is：C：3.6%~
3.9%、Si：0.9%~1.2%、Mn：0.4% ~ 0.6%, S ＜ 0.03%, P ＜ 0.05%, 1550 DEG C ~ 1600 are warming up to by gained molten iron
DEG C insulation carries out purification in 2 ~ 3 minutes and takes off Slag treatment；
（3）Spheroidization and inoculation：The nodulizer that molten iron gross mass 1.3% ~ 1.5% is first added into spheroidization molten iron bag is clapped compacting, then
An inovulant for covering molten iron gross mass 1.7% above is clapped, then molten iron gross mass 1.7% is covered on an inovulant
Iron filings or the compacting of steel beans, then pour step into nodularization bag（2）Gained molten iron carries out spheroidization and inoculation processing, again to ball during water outlet
Change the powdery graphite carburant that molten iron gross mass 0.06% is added in bag, iron is added when water yield reaches the 2/3 of nodularization bag
The post inoculant of the total matter 0.06% of water, water outlet press stokehold components tests result before completing and add suitable copper, ensure each in molten iron
The mass percentage content of component is：C:3.4%~3.7%、Si：1.9%~2.3%、Mn：0.4% ~ 0.6%, S ＜ 0.03%, P ＜
0.05%、Cu：0.5~1%、Mg：0.3%~0.6%、RE：0.01%~0.04%；
（4）Cast：Molten iron pours completely to be completed nodularization, is poured into a mould after inoculation, adds molten iron gross mass with stream during cast
0.15% random inoculant, cannot interrupt in casting process, unpack after casting complete in 15 minutes, and upset sandbox will be cast
Part takes out；
（5）Heat treatment：Turn heat treatment department after casting completes cooling, normalizing, insulation temperature are carried out using the box normalizing furnace of trolley
Spend for 900 DEG C, soaking time 3.5h, it is cold to turn mist immediately after unpacking, and until being cooled to room temperature, that is, obtains full smelting scrap steel casting
QT900-5 spheroidal graphite cast-iron.
Embodiment 3
（1）Dispensing：Content consists of the following compositions molten iron smelting raw material by mass percentage：Steel scrap 80%, foundry returns 16.1%, stone
Inkization carburant 3.7%, ferromanganese 0.2%；
（2）Melting：It is integral that chunky shape steel scrap and iron plate are first put into cuber internal pressure by melting before starting, according to step（1）'s
Raw material proportioning is first added 1.2% packed steel scrap or foundry returns and is quickly dissolved, to ensure that EAF bottom has molten iron；Then press
According to raw material proportioning by the average stove of addition in batches of graphitization carburant and steel scrap, each feed way is that stone is first added into stove
Inkization carburant, adding packed steel scrap will swim in the graphitization carburant press-in molten iron above molten iron；All add
After the completion of material, melting 1.5h is kept the temperature at 1425 DEG C, then does metal ingredient in spectrum analysis detection stove using copper mold sampling, according to
Testing result is added in ferromanganese and foundry returns to stove, and the mass percentage content for ensureing each component in molten iron is：C：3.6%~
3.9%、Si：0.9%~1.2%、Mn：0.4% ~ 0.6%, S ＜ 0.03%, P ＜ 0.05%, 1550 DEG C ~ 1600 are warming up to by gained molten iron
DEG C insulation carries out purification in 2 ~ 3 minutes and takes off Slag treatment；
（3）Spheroidization and inoculation：The nodulizer that molten iron gross mass 1.4% is first added into spheroidization molten iron bag is clapped compacting, then is covered above
Inovulant of top iron and screw water gross mass 1.6% is clapped, then cover on an inovulant molten iron gross mass 1.6% iron filings or
Steel beans are tamped, and then pour step into nodularization bag（2）Gained molten iron carries out spheroidization and inoculation processing, during water outlet again into nodularization bag
The powdery graphite carburant of molten iron gross mass 0.06% is added, the total matter of molten iron is added when water yield reaches the 2/3 of nodularization bag
The post inoculant of amount 0.06%, water outlet press stokehold components tests result before completing and add suitable copper, ensure each component in molten iron
Mass percentage content be：C:3.4%~3.7%、Si：1.9%~2.3%、Mn：0.4% ~ 0.6%, S ＜ 0.03%, P ＜ 0.05%,
Cu：0.5~1%、Mg：0.3%~0.6%、RE：0.01%~0.04%；
（4）Cast：Molten iron pours completely to be completed nodularization, is poured into a mould after inoculation, adds molten iron gross mass with stream during cast
0.15% random inoculant, cannot interrupt in casting process, unpack after casting complete in 15 minutes, and upset sandbox will be cast
Part takes out；
（5）Heat treatment：Turn heat treatment department after casting completes cooling, normalizing, insulation temperature are carried out using the box normalizing furnace of trolley
Spend for 920 DEG C, soaking time 3.5h, it is cold to turn mist immediately after unpacking, and until being cooled to room temperature, that is, obtains full smelting scrap steel casting
QT900-5 spheroidal graphite cast-iron.
Embodiment 4
（1）Dispensing：Content consists of the following compositions molten iron smelting raw material by mass percentage：Steel scrap 80%, foundry returns 16.25%,
Graphitization carburant 3.6%, ferromanganese 0.15%；
（2）Melting：It is integral that chunky shape steel scrap and iron plate are first put into cuber internal pressure by melting before starting, according to step（1）'s
Raw material proportioning is first added 1.5% packed steel scrap or foundry returns and is quickly dissolved, to ensure that EAF bottom has molten iron；Then press
According to raw material proportioning by the average stove of addition in batches of graphitization carburant and steel scrap, each feed way is that stone is first added into stove
Inkization carburant, adding packed steel scrap will swim in the graphitization carburant press-in molten iron above molten iron；All add
After the completion of material, melting 2h is kept the temperature at 1450 DEG C, then metal ingredient in spectrum analysis detection stove is done using copper mold sampling, according to inspection
Survey in result addition ferromanganese and foundry returns to stove, the mass percentage content for ensureing each component in molten iron is：C：3.6%~3.9%、
Si：0.9%~1.2%、Mn：0.4% ~ 0.6%, S ＜ 0.03%, P ＜ 0.05%, 1550 DEG C ~ 1600 DEG C insulations are warming up to by gained molten iron
Carry out purification within 2 ~ 3 minutes and take off Slag treatment；
（3）Spheroidization and inoculation：The nodulizer that molten iron gross mass 1.5% is first added into spheroidization molten iron bag is clapped compacting, then is covered above
Inovulant of top iron and screw water gross mass 1.8% is clapped, then cover on an inovulant molten iron gross mass 1.8% iron filings or
Steel beans are tamped, and then pour step into nodularization bag（2）Gained molten iron carries out spheroidization and inoculation processing, during water outlet again into nodularization bag
The powdery graphite carburant of molten iron gross mass 0.06% is added, the total matter of molten iron is added when water yield reaches the 2/3 of nodularization bag
The post inoculant of amount 0.06%, water outlet press stokehold components tests result before completing and add suitable copper, ensure each component in molten iron
Mass percentage content be：C：3.4%~3.7%、Si：1.9%~2.3%、Mn：0.4% ~ 0.6%, S ＜ 0.03%, P ＜ 0.05%,
Cu：0.5%~1%、Mg：0.3%~0.6%、RE：0.01%~0.04%；
（4）Cast：Molten iron pours completely to be completed nodularization, is poured into a mould after inoculation, adds molten iron gross mass with stream during cast
0.2% random inoculant, cannot interrupt in casting process, unpack after casting complete in 15 minutes, and upset sandbox is by casting
Take out；
（5）Heat treatment：Turn heat treatment department after casting completes cooling, normalizing, insulation temperature are carried out using the box normalizing furnace of trolley
Spend for 920 DEG C, soaking time 3.5h, it is cold to turn mist immediately after unpacking, and until being cooled to room temperature, that is, obtains full smelting scrap steel casting
QT900-5 spheroidal graphite cast-iron.
The chemical composition mass percentage of 1 ~ 4 gained spheroidal graphite cast-iron of embodiment is as shown in table 1：
Table 1
Gained QT900-5 quality of nodular cast iron of the invention is stablized, and as shown in the metallograph of Fig. 1 ~ 4, nodulizing grade is satisfied by 1 ~ 3
Level, 5 ~ 8 grades of graphite size, 1 ~ 4 body of embodiment experiment tension extension data are as shown in table 2：
Table 2
Claims (8)
- A kind of 1. full smelting scrap steel casting QT900-5 spheroidal graphite cast-iron, it is characterised in that each composition quality percentage of spheroidal graphite cast-iron It is than content：C：3.4%~3.7%、Si：1.9%~2.3%、Mn：0.4% ~ 0.6%, S ＜ 0.03%, P ＜ 0.05%, Cu：0.5%~1%、 Mg：0.3%~0.6%、RE：0.01%~0.04%.
- A kind of 2. production technology of full smelting scrap steel casting QT900-5 spheroidal graphite cast-iron as claimed in claim 1, it is characterised in that Comprise the following steps that：（1）Dispensing：Content consists of the following compositions molten iron smelting raw material by mass percentage：Steel scrap 75% ~ 80%, foundry returns 10% ~ 20%th, graphitization carburant 3.6% ~ 4%, ferromanganese 0.15%-1%；（2）Melting：It is integral that chunky shape steel scrap and iron plate are first put into cuber internal pressure by melting before starting, according to step（1）'s Raw material proportioning is first added 1% ~ 1.5% packed steel scrap or foundry returns and is quickly dissolved, to ensure that EAF bottom has molten iron；Then According to raw material proportioning by the average stove of addition in batches of graphitization carburant and steel scrap, each feed way is first to be added into stove Graphitization carburant, adding packed steel scrap will swim in the graphitization carburant press-in molten iron above molten iron；All After the completion of charging, 1 ~ 2h of melting is kept the temperature at 1400 DEG C ~ 1450 DEG C, then does metal in spectrum analysis detection stove using copper mold sampling Component, is added in ferromanganese and foundry returns to stove according to testing result, and the mass percentage content for ensureing each component in molten iron is：C： 3.6%~3.9%、Si：0.9%~1.2%、Mn：0.4% ~ 0.6%, S ＜ 0.03%, P ＜ 0.05%, by gained molten iron be warming up to 1550 DEG C ~ 1600 DEG C of insulations carry out purification in 2 ~ 3 minutes and take off Slag treatment；（3）Spheroidization and inoculation：The nodulizer that molten iron gross mass 1.3% ~ 1.5% is first added into spheroidization molten iron bag is clapped compacting, then An inovulant for covering molten iron gross mass 1.5% ~ 1.8% above is clapped, then molten iron gross mass is covered on an inovulant 1.5 ~ 1.8% iron filings or steel beans compacting, then pours step into nodularization bag（2）Gained molten iron carries out spheroidization and inoculation processing, goes out Add the powdery graphite carburant of molten iron gross mass 0.05% ~ 0.06% during water into nodularization bag again, reach ball in water yield The post inoculant of molten iron gross mass 0.05% ~ 0.06% is added when changing the 2/3 of bag, water outlet presses stokehold components tests result before completing Suitable copper is added, the mass percentage content for ensureing each component in molten iron is：C:3.4%~3.7%、Si：1.9%~2.3%、Mn： 0.4% ~ 0.6%, S ＜ 0.03%, P ＜ 0.05%, Cu：0.5~1%、Mg：0.3%~0.6%、RE：0.01%~0.04%；（4）Cast：Molten iron pours completely to be completed nodularization, is poured into a mould after inoculation, adds molten iron gross mass with stream during cast 0.1% ~ 0.2% random inoculant, cannot interrupt in casting process, unpack after casting complete in 15 minutes, overturn sandbox Casting is taken out；（5）Heat treatment：Turn heat treatment department after casting completes cooling, normalizing, insulation temperature are carried out using the box normalizing furnace of trolley Spend for 910 DEG C ± 10 DEG C, soaking time is 3 ~ 3.5h, and it is cold to turn mist immediately after unpacking, and until being cooled to room temperature, that is, obtains full steel scrap Melting and casting QT900-5 spheroidal graphite cast-iron.
- 3. a kind of production technology of full smelting scrap steel casting QT900-5 spheroidal graphite cast-iron according to claim 2, its feature exist It is carbon steel in the steel scrap, C content is 0.1% ~ 0.2%.
- 4. a kind of production technology of full smelting scrap steel casting QT900-5 spheroidal graphite cast-iron according to claim 2, its feature exist It is in each composition quality percentage composition of the graphitization carburant：C >=98%, S ＜ 0.05, N ＜ 0.03.
- 5. a kind of production technology of full smelting scrap steel casting QT900-5 spheroidal graphite cast-iron according to claim 2, its feature exist In the trade mark of the nodulizer be FeSiMg6RE1.
- 6. a kind of production technology of full smelting scrap steel casting QT900-5 spheroidal graphite cast-iron according to claim 2, its feature exist It is 75 ferrosilicon in an inovulant and post inoculant, grain fineness is 3mm ~ 8mm.
- 7. a kind of production technology of full smelting scrap steel casting QT900-5 spheroidal graphite cast-iron according to claim 2, its feature exist It is 75 ferrosilicon in the random inoculant, fineness is 0.2 ~ 0.8mm.
- 8. a kind of production technology of full smelting scrap steel casting QT900-5 spheroidal graphite cast-iron according to claim 2, its feature exist In step（3）The fineness of the powdery graphite carburant is 0.5 ~ 1mm.
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| CN110117688A (en) * | 2019-05-17 | 2019-08-13 | 重庆银河铸锻有限责任公司 | A kind of electro-smelting method of high-strength abrasion-proof idler wheel casting |
| CN111575440A (en) * | 2020-07-03 | 2020-08-25 | 杨永鑫 | Method for preparing cast iron by utilizing steel shavings |
| CN112063913A (en) * | 2020-09-03 | 2020-12-11 | 四川青江机器股份有限公司 | Method for producing ductile iron casting by using scrap steel |
| CN112322821A (en) * | 2020-11-10 | 2021-02-05 | 吉林省博镪机械制造有限责任公司 | Method for producing high-strength high-toughness QT600-10 nodular cast iron from all-waste steel |
| CN114150213A (en) * | 2021-10-28 | 2022-03-08 | 山东金凯电力金具有限公司 | Preparation process for producing high-strength cast iron by utilizing scrap steel |
| CN114292980A (en) * | 2021-12-30 | 2022-04-08 | 山西华翔集团股份有限公司 | Smelting method of nodular cast iron for passenger car steering knuckle |
| CN114990419A (en) * | 2022-06-22 | 2022-09-02 | 吉林省诚鼎精密铸造有限公司 | Method for smelting cast iron from scrap steel |
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Application publication date: 20180501 |