CN103882175A - Method for producing two brand numbers of low-temperature ductile irons by adopting molten iron - Google Patents
Method for producing two brand numbers of low-temperature ductile irons by adopting molten iron Download PDFInfo
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- CN103882175A CN103882175A CN201410124829.2A CN201410124829A CN103882175A CN 103882175 A CN103882175 A CN 103882175A CN 201410124829 A CN201410124829 A CN 201410124829A CN 103882175 A CN103882175 A CN 103882175A
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 233
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 111
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 22
- 235000000396 iron Nutrition 0.000 title claims abstract description 12
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 32
- 239000000126 substance Substances 0.000 claims abstract description 23
- 238000000034 method Methods 0.000 claims abstract description 20
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 20
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 18
- 229910000805 Pig iron Inorganic materials 0.000 claims abstract description 15
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 13
- 239000010959 steel Substances 0.000 claims abstract description 13
- 230000006698 induction Effects 0.000 claims abstract description 12
- 238000011081 inoculation Methods 0.000 claims abstract description 12
- 239000002054 inoculum Substances 0.000 claims abstract description 11
- 230000008018 melting Effects 0.000 claims abstract description 9
- 238000002844 melting Methods 0.000 claims abstract description 9
- 238000005266 casting Methods 0.000 claims abstract description 7
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 7
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 6
- 230000023556 desulfurization Effects 0.000 claims abstract description 6
- 239000000203 mixture Substances 0.000 claims description 29
- 239000002667 nucleating agent Substances 0.000 claims description 17
- 238000010079 rubber tapping Methods 0.000 claims description 17
- 229910052698 phosphorus Inorganic materials 0.000 claims description 13
- 229910052717 sulfur Inorganic materials 0.000 claims description 13
- 239000002994 raw material Substances 0.000 claims description 12
- 229910052751 metal Inorganic materials 0.000 claims description 11
- 239000002184 metal Substances 0.000 claims description 11
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 9
- XOCUXOWLYLLJLV-UHFFFAOYSA-N [O].[S] Chemical compound [O].[S] XOCUXOWLYLLJLV-UHFFFAOYSA-N 0.000 claims description 8
- 235000003599 food sweetener Nutrition 0.000 claims description 7
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 7
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 7
- 239000003765 sweetening agent Substances 0.000 claims description 7
- 229910052719 titanium Inorganic materials 0.000 claims description 7
- 229910052720 vanadium Inorganic materials 0.000 claims description 7
- 229910052791 calcium Inorganic materials 0.000 claims description 6
- 229910052804 chromium Inorganic materials 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- 229910052788 barium Inorganic materials 0.000 claims description 4
- 229910052747 lanthanoid Inorganic materials 0.000 claims description 4
- 150000002602 lanthanoids Chemical class 0.000 claims description 4
- 229910052746 lanthanum Inorganic materials 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 238000002203 pretreatment Methods 0.000 claims description 4
- 238000007670 refining Methods 0.000 claims description 4
- 229910000616 Ferromanganese Inorganic materials 0.000 claims description 3
- 238000004880 explosion Methods 0.000 claims description 3
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims description 3
- XEEYBQQBJWHFJM-RNFDNDRNSA-N iron-60 Chemical compound [60Fe] XEEYBQQBJWHFJM-RNFDNDRNSA-N 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 3
- 238000009966 trimming Methods 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 2
- 238000010792 warming Methods 0.000 claims description 2
- XWHPIFXRKKHEKR-UHFFFAOYSA-N iron silicon Chemical compound [Si].[Fe] XWHPIFXRKKHEKR-UHFFFAOYSA-N 0.000 abstract description 2
- 238000007781 pre-processing Methods 0.000 abstract 1
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical compound S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 abstract 1
- 239000011572 manganese Substances 0.000 description 12
- 239000011777 magnesium Substances 0.000 description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 229910001141 Ductile iron Inorganic materials 0.000 description 6
- 239000011575 calcium Substances 0.000 description 5
- 239000010439 graphite Substances 0.000 description 5
- 229910002804 graphite Inorganic materials 0.000 description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 3
- 229910052749 magnesium Inorganic materials 0.000 description 3
- 235000019362 perlite Nutrition 0.000 description 3
- 239000010451 perlite Substances 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 239000011573 trace mineral Substances 0.000 description 2
- 235000013619 trace mineral Nutrition 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- 229910000617 Mangalloy Inorganic materials 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical group [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 241000282898 Sus scrofa Species 0.000 description 1
- GJEAMHAFPYZYDE-UHFFFAOYSA-N [C].[S] Chemical compound [C].[S] GJEAMHAFPYZYDE-UHFFFAOYSA-N 0.000 description 1
- FQNGWRSKYZLJDK-UHFFFAOYSA-N [Ca].[Ba] Chemical compound [Ca].[Ba] FQNGWRSKYZLJDK-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- QMQXDJATSGGYDR-UHFFFAOYSA-N methylidyneiron Chemical compound [C].[Fe] QMQXDJATSGGYDR-UHFFFAOYSA-N 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000010183 spectrum analysis Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses a method for producing two brand numbers of low-temperature ductile irons by adopting molten iron. The method comprises the following steps: simultaneously adding pig iron, steel scrap, scrap returns, recarburizing agent and scrap iron into a medium-frequency induction furnace, then adding 75 silicon iron; then adjusting Si and Mn to be in a scope required by base iron; melting the molten iron till the temperature reaches 1480-1500 DEG C, pouring the molten iron into a porous plug desulfurization molten iron ladle, simultaneously adding a desulfurization agent, introducing nitrogen into the porous plug so that the desulfurized molten iron rolls over; feeding the desulfurized molten iron to an induction electric furnace, simultaneously adding the recarburizing agent which needs to be supplemented in the furnace, increasing the temperature of the molten iron in the furnace to be 1500-1520 DEG C, preserving heat, standing for 5-10 minutes and adjusting chemical components of the molten iron in the furnace; preprocessing the molten iron and carrying out spheroidizing inoculation, pouring at a temperature of 1330-1350 DEG C and adding 0.15% sulphur oxide stream inoculants during the pouring process; opening a box when the temperature of casting is less than or equal to 300 DEG C. The method is capable of producing products of two different brand numbers (QT350-22AL and QT400-18AL), thus providing convenience for the production.
Description
Technical field
The present invention relates to a kind of production method of low-temperature ball spheroidal graphite cast iron, be specifically related to utilize a kind of base iron to produce the method for the low-temperature spheroidal iron of the different trades mark.
Background technology
Spheroidal graphite cast iron has the advantages such as good mechanical property, processing characteristics, wear resisting property, shock-absorbing performance and low cost of manufacture, is not only widely used, and constantly replaces cast steel material to manufacture the structural part of high request.But it is poor that the shortcoming of common spheroidal graphite cast iron is low-temperature impact resistance, be subject to certain restriction being applied to aspect the workpiece that bears moving load under low temperature.
Require and intensity (20 ℃) requirement for reaching low temperature (40 ℃) impelling strength, external general employing adds Ni0.5～2wt% and produces low-temperature spheroidal iron.As Denmark and India add Ni0.5～2wt% in the time producing high-power wind-driven generator foundry goods, nickel is narrow resources, expensive.Especially iron quality is good for external starting material, generally adopts the Australian pig iron and the Canadian pig iron, and its trace element and harmful element are than low many of the domestic pig iron.
In the production process of current low-temperature ball spheroidal graphite cast iron, a kind of base iron often can only be produced a kind of nodular cast iron of the trade mark, and the nodular cast iron of producing the different trades mark need to configure different raw materials, causes the inconvenience of production.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of a kind of utilize base iron to produce the low-temperature spheroidal iron of the different trades mark method, provides convenience for producing.
For solving the problems of the technologies described above, the technical solution used in the present invention is: the method for two kinds of trade mark low-temperature spheroidal irons of a kind of molten iron production, is characterized in that: comprise the steps:
(1) reinforced melting: by the pig iron, steel scrap, foundry returns, carburelant and steel scrap add medium-frequency induction furnace simultaneously, then add 75 ferrosilicon;
(2) trimming: molten iron is warming up to 1440～1460 ℃, by adding 75 ferrosilicon, ferromanganese that Si, Mn are adjusted to the scope that base iron requires;
(3) desulfurization processing: molten iron is melting to 1480～1500 ℃ are poured in porous plug desulphurised hot metal bag, add 1%～1.5% sweetening agent of weight of molten iron simultaneously, and from porous plug, be filled with nitrogen and make molten iron rolling, rush nitrogen and finish for 3～5 minutes, the sweetening agent on molten iron surface is removed clean;
(4) molten iron refining and chemical composition fine setting: the molten iron of de-over cure is got back in induction furnace, in stove, add required supplementary carburelant by calculating simultaneously, make it meet base iron carbon content standard, in stove, molten iron temperature rises to 1500～1520 ℃, insulation, leave standstill 5～10 minutes, adjust the silicon of molten iron in stove, the chemical composition of manganese by calculating, make it meet base iron standard;
(5) hot metal pretreatment and spheroidization and inoculation processing: utilize nodulizing agent, nucleating agent, silieonized plate and molten iron and treatment agent to carry out pre-treatment and spheroidization and inoculation processing;
(6) cast is bred: 1330～1350 ℃ of teeming temperatures, when cast, add 0.15% sulphur oxygen random inoculant, and use current-following inoculation device, guarantee that sulphur oxygen random inoculant can together enter casting mold die cavity with molten iron stream;
(7) unpack:, unpack when the casting temperature≤300 ℃.
Further, described hot metal pretreatment and spheroidization and inoculation are processed and are specifically comprised the following steps:
A, that 0.9～1.0% group of the lanthanides nodulizing agent of the weight of tapping a blast furnace is joined to the nodularization of spheroidizing reacion bag is indoor;
B, 0.35～0.45% nucleating agent of the weight of tapping a blast furnace is covered on nodulizing agent;
C, 0.5～0.6% silieonized plate of the weight of tapping a blast furnace is covered on nucleating agent;
D, 0.1% silicon carbide half of the weight of tapping a blast furnace is covered on silieonized plate, half joins opposite, spheroidizing reacion chamber.
E, from electric furnace, tap a blast furnace in nodularization bag, tapping temperature is controlled at 1460～1480 ℃, and while tapping a blast furnace, molten iron is not directly flushed on nodulizing agent, measures nodularization explosion time simultaneously, illustrates that spheroidizing reacion is qualified between 55 seconds to 100 seconds.
Further, in raw material, the mass percent of each composition is: the pig iron 60 ± 2%, steel scrap 10 ± 2%, foundry returns 30 ± 2%; The consumption of various auxiliary materials is: 0.2%, 75 ferrosilicon that carburelant is raw materials quality is raw materials quality 0.5%, nodulizing agent be weight of iron 0.9%, nucleating agent be weight of iron 0.35%, random inoculant is 0.15% of weight of iron.
Further, the chemical composition of the described pig iron is as follows: C 4.25%, and Si 0.15%, Mn 0.016 %, P 0.023%, S 0.006%, Cr 0.033%, Ti 0.010%, V 0.040%, surplus is Fe.
Further, the chemical composition of described steel scrap is as follows: C 0.018%, Si 0.10%, Mn 0.13 %, P 0.05%, S 0.017%, Cr 0.05%, Ti 0.038%, V 0.040%, all the other compositions.
Further, the chemical composition of described nodulizing agent is as follows: Mg 5.85%, and Al 0.21%, Si 46.97 %, Ca 3.15%, La 0.48%, all the other compositions are Fe.
Further, the chemical composition of described nucleating agent is as follows: Si 66%, and Ca 1.02%, Ba 1.16%, all the other compositions are Fe.
Further, described molten iron and treatment agent are silicon carbide, and granularity is 0～1mm.
Further, the chemical composition of described base iron is: C 3.80～3.90%, and Si 1.20～1.30%, Mn 0.1%～0.15%, P≤0.03%, S 0.012～0.016%, surplus is Fe.
Further, the chemical composition of described whole molten iron is C 3.65～3.75%, Si 1.85～1.95%, and Mn 0.1%～0.15%, P≤0.03%, S 0.008～0.012%, residual Mg 0.040～0.050%, surplus is Fe.
Beneficial effect of the present invention: the present invention adopts high-purity pig iron, greatly reduces the impact of trace harmful elements on final performance; By using group of the lanthanides nodulizing agent to guarantee the nodularization rate of foundry goods; The pre-treatment of molten iron is placed in nodularization bag and is carried out, replaced in induction furnace molten iron is carried out to pre-treatment, improved the effect to hot metal pretreatment; Use sulphur oxygen random inoculant to improve the quantity of graphite pebbles; By controlling the chemical composition of molten iron, especially the content of whole molten iron silicon is controlled in narrower scope, replace originally to adding the low-temperature impact that nickel improves foundry goods in molten iron and absorb merit, save manufacturing cost; Method of the present invention can be produced the product of QT350～22AL and two different trades mark of QT400～18AL simultaneously, provides convenience for producing.
Accompanying drawing explanation
Fig. 1 is the metallographic structure figure of low-temperature spheroidal iron of the present invention.
Fig. 2 is the perlite figure of body coupon of the present invention.
Embodiment
Below in conjunction with specific embodiment, technical scheme of the present invention is elaborated.
One, raw material
1.1 batching
In raw material, the mass percent of each composition is: the pig iron 60 ± 2%, steel scrap 10 ± 2%, foundry returns 30 ± 2%; Supplementary product consumption: 0.2%, 75 ferrosilicon that carburelant is raw materials quality is raw materials quality 0.5%, nodulizing agent be weight of iron 0.9～1.0%, nucleating agent be weight of iron 0.35～0.45%, random inoculant is 0.1～0.15% of weight of iron.
1.2 raw material choose
1.2.1 the pig iron
Adopt the purity higher pig iron, harmful element Mn, P, S trace element Cr, Ti, V are lower, thereby can improve the final mechanical property of foundry goods, and chemical composition is as follows:
C 4.25% Si 0.15% Mn 0.016 % P 0.023% S 0.006%
Cr 0.033% Ti 0.010% V 0.040%
1.2.2 steel scrap
Adopt low manganese steel scrap, prevent that alloy element is too high, affect the unit elongation of final product.Chemical composition is as follows:
C 0.018% Si 0.10% Mn 0.13 % P 0.05%
S 0.017% Cr 0.05% Ti 0.038% V 0.040%
1.2.3 nodulizing agent
Adopt group of the lanthanides nodulizing agent, the ability of harmful element is stronger in Rare Earth Lanthanum and in molten iron, and after nodularization, the contraction tendency of molten iron is less, is conducive to prevent that foundry goods from producing shrinkage defect.Magnesium is main nodularization element, and molten iron is to the specific absorption of magnesium between 70%～80%, and nodulizing agent magnesium content is the most suitable between 5%～6%.The aluminium of trace can improve the spheroidization ability of nodulizing agent, and too high foundry goods easily forms gas hole defect.Severe degree when calcium can relax liquid iron balling, reduces the consume of nodulizing agent.Chemical composition is as follows:
Mg 5.85% Al 0.21% Si 46.97 %
Ca 3.15% La 0.48%
1.2.4 nucleating agent
Adopt Si-Ca-Ba nucleating agent, when calcium barium uses simultaneously, pregnant effect is stronger, and barium can reduce the time of spheroidization and inoculation declined, and chemical composition is as follows:
Si 66% Ca 1.02% Ba 1.16%
1.2.5 random inoculant
Adopt sulphur oxygen nucleating agent, micro-S, O meet Mg and form the core of MgS MgO as crystallization nucleation, are conducive to the number of graphite pebbles.
1.2.6 hot metal pretreatment agent
Adopt SiC to do pretreating agent, granularity 0～1mm, the object that SiC does pretreating agent improves the quantity of graphite forming core and the roundness of graphite pebbles, improves tensile property and unit elongation.
Two, molten iron chemical composition requirement
Base iron: C 3.80～3.90% Si 1.20～1.30% Mn 0.1%～0.15% P≤0.03% S 0.012～0.016%
The residual Mg 0.040～0.050% of whole molten iron: C 3.65～3.75% Si 1.85～1.95% Mn 0.1%～0.15% P≤0.03% S 0.008～0.012%
Three, production stage
3.1 reinforced meltings
Order of addition(of ingredients) is according to the pig iron, steel scrap, foundry returns, carburelant and steel scrap add medium-frequency induction furnace simultaneously, in induction furnace, cast iron melting added 75 ferrosilicon by 3/4 o'clock, every batch of material adds can not be too much, prevent that furnace charge from puing up a shed in electric furnace, the furnace charge in stove remain on electric furnace ruhmkorff coil below just can, treat that full stove molten iron is melting is warmed up to 1440～1460 ℃, molten iron is carried out to spectrum sampling analysis, measure the content of molten iron C in stove simultaneously with carbon sulphur instrument.
2. trimming
According to spectral analysis data, add 75 ferrosilicon, ferromanganese that Si, Mn are adjusted to the scope that base iron requires, carbon is adjusted after desulfurization is processed.
3. desulfurization processing
Molten iron is melting to 1480～1500 ℃ are poured in porous plug desulphurised hot metal bag, added 1%～1.5% sweetening agent of weight of molten iron simultaneously, and from porous plug, be filled with nitrogen and make molten iron rolling, guarantee that molten iron fully contacts with sweetening agent, thereby guarantee sweetening effectiveness.Rush after nitrogen end in 3～5 minutes, at once the sweetening agent on molten iron surface is removed totally, prevent that the sulphur of taking off from coming back in molten iron.
4. molten iron refining
The molten iron of de-over cure is got back in induction furnace, in stove, added required supplementary carburelant simultaneously.When backwater, the power of induction furnace is transferred to maximum, guarantees to have when larger electromagnetic stirring force heats up molten iron and constantly roll in stove, thereby make carburelant absorb fully and reach the object of molten iron degasification.In stove, molten iron temperature rises to 1500～1520 ℃, and induction furnace power is adjusted to keeping warm mode, and molten iron leaves standstill 5～10 minutes, molten iron in stove is carried out to sampling analysis simultaneously and guarantees that molten iron chemical composition meets base iron standard.Time of repose finishes refining process and finishes.
5. hot metal pretreatment and spheroidization and inoculation processing
A, that nodulizing agent (weight of tapping a blast furnace 0.9～1.0%) is joined to the nodularization of spheroidizing reacion bag is indoor.
B, nucleating agent (weight of tapping a blast furnace 0.35～0.45%) is covered on nodulizing agent.
C, silieonized plate (weight of tapping a blast furnace 0.5%～0.6) is covered on nucleating agent.
D, by SiC(tap a blast furnace weight 0.1%) half covers on silieonized plate, half joins opposite, spheroidizing reacion chamber.
E, from electric furnace, tap a blast furnace in nodularization bag, tapping temperature is controlled at 1460～1480 ℃, and while tapping a blast furnace, molten iron is not directly flushed on nodulizing agent, measures nodularization explosion time with stopwatch simultaneously, spheroidizing reacion is described between 55 seconds to 100 seconds after whole molten iron qualified.
6. cast is bred
1330～1350 ℃ of teeming temperatures, add 0.1～15% sulphur oxygen random inoculant when cast, use current-following inoculation device, guarantee that sulphur oxygen nucleating agent can together enter casting mold die cavity with molten iron stream.
7. unpack
While recording casting temperature≤300 ℃ with thermocouple temperature measurement instrument, unpack, the excess Temperature of unpacking, foundry goods easily produces perlite, makes final mechanical property defective.
Four, the attached coupon assay that helps
Nodularization rate as can be known from Fig. 1 >=90%, as can be known from Fig. 2 perlite≤5%.
The method of production low-temperature spheroidal iron of the present invention can meet the performance requriements of the low-temperature spheroidal iron of QT350-22AL and two kinds of trades mark of QT400-18AL simultaneously, and the body nodularization rate of foundry goods reaches more than 90%, and graphite pebbles is uniformly distributed, and ferrite is more than 98%.
Claims (10)
1. a method for the multiple trade mark low-temperature spheroidal iron of molten iron production, is characterized in that: comprise the steps:
(1) reinforced melting: by the pig iron, steel scrap, foundry returns, carburelant and steel scrap add medium-frequency induction furnace simultaneously, then add 75 ferrosilicon;
(2) trimming: molten iron is warming up to 1440～1460 ℃, by adding 75 ferrosilicon, 65 ferromanganese that Si, Mn are adjusted to the scope that base iron requires;
(3) desulfurization processing: molten iron is melting to 1480～1500 ℃ are poured in porous plug desulphurised hot metal bag, add 1%～1.5% sweetening agent of weight of molten iron simultaneously, and from porous plug, be filled with nitrogen and make molten iron rolling, rush nitrogen and finish for 3～5 minutes, the sweetening agent on molten iron surface is removed clean;
(4) molten iron refining: the molten iron of de-over cure is got back in induction furnace, added required supplementary carburelant in stove, in stove, molten iron temperature rises to 1500～1520 ℃ simultaneously, insulation, leave standstill 5～10 minutes, adjust the chemical composition of molten iron in stove, make it meet base iron standard;
(5) hot metal pretreatment and spheroidization and inoculation processing: utilize nodulizing agent, nucleating agent, silieonized plate and hot metal pretreatment agent to carry out pre-treatment and spheroidization and inoculation processing;
(6) cast is bred: 1330～1350 ℃ of teeming temperatures, when cast, add 0.15% sulphur oxygen random inoculant, and use current-following inoculation device, guarantee that sulphur oxygen random inoculant can together enter casting mold die cavity with molten iron stream;
(7) unpack:, unpack when the casting temperature≤300 ℃.
2. the method for two kinds of trade mark low-temperature spheroidal irons of a kind of molten iron production according to claim 1, is characterized in that: described hot metal pretreatment and spheroidization and inoculation are processed and specifically comprised the following steps:
A, that 0.9%～1.0% group of the lanthanides nodulizing agent of the weight of tapping a blast furnace is joined to the nodularization of spheroidizing reacion bag is indoor;
B, 0.35%～0.45% nucleating agent of the weight of tapping a blast furnace is covered on nodulizing agent;
C, 0.5～0.6%% silieonized plate of the weight of tapping a blast furnace is covered on nucleating agent;
D, 0.1～0.15% silicon carbide half of the weight of tapping a blast furnace is covered on silieonized plate, half joins opposite, spheroidizing reacion chamber.
E, from electric furnace, tap a blast furnace in nodularization bag, tapping temperature is controlled at 1460～1480 ℃, and while tapping a blast furnace, molten iron is not directly flushed on nodulizing agent, measures nodularization explosion time simultaneously, illustrates that spheroidizing reacion is qualified between 55 seconds to 100 seconds.
3. the method for two kinds of trade mark low-temperature spheroidal irons of a kind of molten iron production according to claim 1 and 2, is characterized in that: in raw material, the mass percent of each composition is: the pig iron 60 ± 2%, steel scrap 10 ± 2%, foundry returns 30 ± 2%; The consumption of various auxiliary materials is: 1%, 75 ferrosilicon that carburelant total amount is raw materials quality is raw materials quality 0.5%, nodulizing agent be weight of iron 0.9%, nucleating agent be weight of iron 0.35%, random inoculant is 0.15% of weight of iron.
4. the method for two kinds of trade mark low-temperature spheroidal irons of a kind of molten iron production according to claim 1, is characterized in that: the chemical composition of the described pig iron is as follows: C 4.25%, Si 0.15%, Mn 0.016 %, P 0.023%, S 0.006%, Cr 0.033%, Ti 0.010%, V 0.040%, surplus is Fe.
5. the method for two kinds of trade mark low-temperature spheroidal irons of a kind of molten iron production according to claim 1, is characterized in that: the chemical composition of described steel scrap is as follows: C 0.018%, Si 0.10%, Mn 0.13 %, P 0.05%, S 0.017%, Cr 0.05%, Ti 0.038%, V 0.040%, all the other are Fe.
6. the method that a kind of base iron according to claim 1 is produced multiple low-temperature spheroidal iron, is characterized in that: the chemical composition of described nodulizing agent is as follows: Mg 5.85%, and Al 0.21%, Si 46.97 %, Ca 3.15%, La 0.48%, all the other are Fe.
7. the method for two kinds of trade mark low-temperature spheroidal irons of a kind of molten iron production according to claim 1, is characterized in that: the chemical composition of described nucleating agent is as follows: Si 66%, and Ca 1.02%, Ba 1.16%, all the other compositions are Fe.
8. the method for two kinds of trade mark low-temperature spheroidal irons of a kind of molten iron production according to claim 1, is characterized in that: described molten iron and treatment agent are silicon carbide, granularity is 0～1mm.
9. the method for two kinds of trade mark low-temperature spheroidal irons of a kind of molten iron production according to claim 1, is characterized in that: the chemical composition of described base iron is: C 3.80～3.90%, Si 1.20～1.30%, Mn 0.1%～0.15%, P≤0.03%, S 0.012～0.016%, surplus is Fe.
10. the method for two kinds of trade mark low-temperature spheroidal irons of a kind of molten iron production according to claim 1, it is characterized in that: the chemical composition of described whole molten iron is C 3.65～3.75%, Si 1.85～1.95%, Mn 0.1%～0.15%, P≤0.03%, S 0.008～0.012%, residual Mg 0.040～0.050%, surplus is Fe.
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