CN109402492A - A kind of outer processing method of the furnace of carbide-containing molten ductile cast iron - Google Patents
A kind of outer processing method of the furnace of carbide-containing molten ductile cast iron Download PDFInfo
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- CN109402492A CN109402492A CN201811481137.8A CN201811481137A CN109402492A CN 109402492 A CN109402492 A CN 109402492A CN 201811481137 A CN201811481137 A CN 201811481137A CN 109402492 A CN109402492 A CN 109402492A
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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
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
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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
- C22C33/10—Making cast-iron alloys including procedures for adding magnesium
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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
- C22C37/06—Cast-iron alloys containing chromium
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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
Abstract
A kind of outer processing method of the furnace of carbide-containing molten ductile cast iron, belongs to casting technology field.The first melting carbide-containing molten ductile cast iron in medium-frequency induction furnace or furnace cupola, and by the chemical composition of molten iron and its mass fraction control in 3.34~3.75%C, 1.59~1.88%Si, 0.94~1.07%Cr, 0.45~0.64%Mn, 1.09~1.26%Cu ,≤0.06%S ,≤0.08%P, Fe surplus；When molten iron temperature reaches 1483-1509 DEG C, by molten iron pre-spheroidizing in nodularization packet, then two kinds of core-spun yarns are successively fed with wire feeder, after treated molten steel solidification, graphite nodule rate is high, and graphite nodule size is tiny, and is evenly distributed, carbide can significantly improve the intensity and toughness of carbide-containing spheroidal graphite cast-iron in suspension and isolated distribution.
Description
Technical field
The invention discloses processing method outside a kind of furnace of molten ductile cast iron, in particular to a kind of carbide-containing spheroidal graphite casting
The outer processing method of the furnace of iron molten iron, belongs to casting technology field.
Background technique
Spheroidal graphite cast-iron has intensity more higher than common grey iron and better toughness, obtains in the industrial production extensively
Using.In order to make up the deficiency that spheroidal graphite cast-iron hardness is low and wears no resistance, strong carbide is added in spheroidal graphite cast-iron and generates element,
Obtaining carbide-containing spheroidal graphite cast-iron can obtain after isothermal hardening containing acicular ferrite, globular graphite, high carbon austenitic
And the spheroidal graphite cast-iron of certain content carbide, there is the features such as hardness is high, and obdurability is good, can be applied to agricultural machinery, mining
The fields such as equipment, railway have excellent wearability.For manufacturing ball mills, wear weight loss is low-chromium cast-iron grinding ball
One third, without broken and lose circle phenomenon.
In order to further increase the performance of carbide-containing spheroidal graphite cast-iron, Chinese invention patent CN 106834902 discloses one
Kind high-wearing feature carbide-containing ausferrite spheroidal graphite cast iron and preparation method thereof, the invention improves upon the castings of carbide-containing Austria iron body spheroidal graphite
The formula of iron, i.e. its element form by mass percentage are as follows: C:3.50~3.90%, Si:2.90~3.50%, Mn:1.30
~1.70%, P < 0.08%, S:< 0.012%, RE:0.01~0.04%, Mg:0.025~0.04%, Cr:0.08~
0.18%, V:0.17~0.32%, Ti:0.08~0.18%, Cu:0.30~0.40%, B:0.001~0.006%, surplus are
Fe, RE are rare earth metal, preferably Y.Chinese invention patent CN 105420594 also discloses a kind of carbide-containing isothermal hardening ball
Black cast iron tup, component include: carbon by weight percentage: 3.4~3.8%, silicon: and 2.2~3.0%, manganese: 0.2~0.5%,
Chromium: 0.4~0.6%, molybdenum: 0.2~0.3%, copper: 0.4~0.6%, nickel: 0.3~0.4%, phosphorus :≤0.05%, sulphur :≤
0.03%, remaining is iron.The invention also discloses the preparation method of above-mentioned carbide-containing austempering ductile iron tup, packet
It includes: melting；Casting；Heat treatment: tup green body is heated up and carries out austenitizing, is then kept the temperature, isothermal hardening obtains carbide-containing
Austempering ductile iron tup, austempering temperature are 240~280 DEG C, and isothermal quenching time is 3.5~4.5h.The invention
Also disclose the application of above-mentioned carbide-containing austempering ductile iron tup.Chinese invention patent CN 107142353 is also disclosed
A kind of preparation method of Austenite-Bainite Ductile Iron abrading-ball, according to weight ratio of constituents: C:3.5~3.8%；Si:2.0
~2.5%；Mn:2.0~2.5%；Mg:0.04~0.06%；Cr:0.5~0.8%；Mo:0.15~0.3%；Re:0.02~
0.03%；P≤0.03%；S≤0.03%, Fe and inevitable impurity ingredient and melting carry out ball by feeding pompon method
Change inoculation, pour and cast out ductile iron abrading-ball, be then heat-treated using isothermal salt bath quenching, finally carries out cleaning and low
Temperature tempering, obtains Austenite-Bainite Ductile Iron abrading-ball；The abrading-ball microscopic structure of calcium method preparation is mainly graphite, remnants
Austenite, carbide, acicular bainite and a small amount of martensite, the abrading-ball hardness of produced different-diameter are HRC55-62, and
And inside and outside hardness difference is less than 5, impact flexibility αkFor 5~16J/cm2, falling sphere number >=20000 time, have good wearability,
Impact flexibility and preferable comprehensive mechanical property.Chinese invention patent CN 105274423 also disclose a kind of carbide-containing etc.
Temperature quenching spheroidal graphite cast-iron and preparation method thereof, the chemical component of the spheroidal graphite cast-iron are (wt.%): C3.3~3.8, Si1.5~
2.5, Cr0.2~0.7, Mn0.4~1.0, Mo0.2~0.6, V0.02~0.08, Ni0.2~0.5, Cu0.15~0.30,
Mg0.015~0.030, RE0.02~0.05, S≤0.080, P≤0.080, Fe surplus.Preparation process includes: the preparation of raw material
It is smelted with intermediate frequency furnace；The spheroidising and inoculation of iron liquid；Same temperature hardening heat treatment.The invention passes through addition trace V element
And suitably reduce Si content, with obtain small and dispersed distribution carbide tissue, it is this tissue so that the spheroidal graphite cast-iron it is resistance to
Mill performance improves a lot, while by adding a small amount of Ni, improving the impact property of spheroidal graphite cast-iron.Chinese invention patent CN
104233051 also disclose a kind of carbide-containing ausferrite spheroidal graphite cast iron composition and mass percentage are as follows: C:3.10~3.60；
Si:2.50~3.50；Mn:0.4~1.2；P≤0.040；S≤0.008；Mg:0.02~0.04；RE:0.02~0.045；Cr:
0.30~1.80；V:0.19~0.60；Surplus is iron.Preparation methods steps are as follows: melting: preparation raw material, heat melting；It will
VNCR-80 rare earth magnesium nodularizer is placed in packet bottom groove, places VI-370 Si-Ba alloy inovulant, obtains iron after spheroidization and inoculation
Liquid；By iron liquid casting in sand mold type chamber, the pearlite matrix spheroidal graphite cast-iron of carbide-containing and graphite nodule is prepared after cooling；It will
Pearlite matrix spheroidal graphite cast-iron, which is put into, is heated to 250~300 DEG C of 45%KNO3+ 55%NaNO3In fused salt, heat preservation 1.5~3.0
After hour, it is cooled to room temperature, obtains carbide-containing ausferrite spheroidal graphite cast iron described in the invention.The spheroidal graphite cast-iron of the invention is
A kind of hardness is high, and intensity is high, toughness and the good carbide-containing ausferrite spheroidal graphite cast iron of wear-resisting property.Chinese invention patent CN
105986052 also disclose the CADI spheroidal graphite cast-iron drill rod/pick rod and its production method of a kind of high-wearing feature, in spheroidal graphite cast-iron original
In molten iron by weight of molten iron percentage in furnace be added 99.9% pure tungsten stick 0.15~0.53%, vanadium iron 0.20~
0.50%, melting tungsten vanadium alloy spheroidal graphite cast-iron base iron, the drill rod that base iron is poured after spheroidising and inoculation/
Pick rod is after supercooling, cleaning, ball blast, machining, in 860~920 DEG C of progress austenitizing processing and at 230~320 DEG C
Means of isothermal quenching is carried out, metallographic structure is made of iron body+carbide+graphite nodule difficult to understand.The CADI spheroidal graphite cast-iron of invention production
Drill rod/pick rod has very high impact flexibility and wear resistence, and center toughness is high, will not be broken, and surface hardness is high, extremely wear-resistant,
Long service life.Chinese invention patent CN 105838972 also discloses a kind of austenite ductile cast iron of carbide-containing, contains
The elemental composition of following degree: C3.0-3.7%, Si2.7-3.2%, Mn1.0-1.5%, Nb0.2-0.3%,
Ni0.2-0.4%, V0.2-0.3%, Mg0.02-0.04%, RE0.02-0.045%, surplus be Fe and inevitable impurity,
The invention also discloses a kind of preparation method of the austenite ductile cast iron of carbide-containing, including melting, spheroidization and inoculation, casting,
Heat treatment has obtained based on bainite+retained austenite+a small amount of martensite matrix group through isothermal technology for processing oil quenching
It knits, and Tissue distribution is uniform, further increases the mechanical property of CADI, there are good toughness, hardness and abrasion resistance properties, and
Process for producing is simple.Chinese invention patent CN 105132790 also discloses a kind of iron body spheroidal graphite of Austria containing vanadium carbide casting
Iron, composition and mass percentage are as follows: C:3.20~3.70；Si:2.50~3.30；Mn:0.4~0.8；P≤0.040；S≤
0.007；Ce:0.01~0.04；Mg:0.01~0.04；Cr:0.30~1.80；V:0.25~0.70；Surplus is iron.It is prepared
Method is as follows: (1) pig iron, steel scrap, manganese iron and vanadium iron being heated melting；(2) rare earth magnesium nodularizer is placed in packet bottom groove, above
Place inovulant；1350~1430 DEG C of pouring temperature, the duration of pouring 10~30 seconds, spheroidal graphite cast-iron is obtained after cooling；(3) it will cool down
Spheroidal graphite cast-iron afterwards is heated to 850~920 DEG C, keeps the temperature 2~4 hours, is then placed in 280~320 DEG C of 45%KN03+55%
In NaN03 fused salt, 1~3 hour is kept the temperature, taking-up is cooled to room temperature, and obtains the iron body spheroidal graphite of Austria containing vanadium carbide described in the invention
Cast iron.The iron body spheroidal graphite cast-iron of Austria containing vanadium carbide of the invention is good carbon containing of a kind of high tenacity high rigidity, comprehensive mechanical property
Compound Austria iron body spheroidal graphite cast-iron.Chinese invention patent CN 104831024 also discloses a kind of iron body ductile iron abrading-ball isothermal difficult to understand
Pearlite matrix ductile iron abrading-ball containing graphite nodule and carbide is heated to 900~950 DEG C by quenching heat treatment technique,
Heat preservation 1~4 hour, then quench rapidly be 220~300 DEG C into temperature mass percent concentration be 50%NaNO2+ quality percentage
Specific concentration is 50%KNO3Nitrate solution in, the retention time 2~4 hours, then take out and be cooled to room temperature in air, finally
A kind of iron body ductile iron abrading-ball difficult to understand obtained, this iron body ductile iron abrading-ball same temperature hardening heat treatment difficult to understand which is related to
Technique, the volume hardness HRC55 of the abrading-ball, the impact flexibility of abrading-ball ontology can reach 12.0J/cm2, ball falling impact fatigue life
Reach 13000 times.Chinese invention patent CN 104831156 is also disclosed at a kind of iron body ductile iron abrading-ball microalloying difficult to understand
Reason method, 0.03 set~0.07%B in the mass percent of the chemical element composition of iron body ductile iron abrading-ball difficult to understand,
The requirement of 0.06~0.12%Ti and 0.03~0.2%V is converted to the mass percent of BFe, TiFe and VFe alloy respectively, claims
It is crushed to 0.5~1.0mm after amount, is added in packet together in company with nodulizer and inovulant, when tapping, utilizes the heat of high temperature iron liquid
Amount and stirring action are absorbed so that BFe, TiFe and VFe alloy fine grained are dissolved in iron liquid by iron liquid, complete microalloy
Change processing.This iron body ductile iron abrading-ball microalloy treatment method difficult to understand that the invention is related to, the B, Ti, V alloy of the method
The absorptivity of element is higher, refines the graphite nodule of iron body ductile iron abrading-ball obtained difficult to understand and distribution of carbides uniformly and, power
Performance is learned to improve.
But the method for above-mentioned various processing carbide-containing molten ductile cast irons, or exist and need that expensive alloy is added
Elemental vanadium, niobium cause production cost excessively high, or there are spheroidization of graphite effect is bad and carbide is in continuous net-shaped distribution, cause
The deficiencies such as carbide-containing spheroidal graphite cast-iron mechanical property is low.
Summary of the invention
The purpose of the present invention is traditional nodularization method that pours is changed to three-step approach, i.e., appropriate vermiculizer is first put into nodularization packet
In pit, silicon steel sheet is covered above, after spheroidising, ladle is transferred to and feeds silk position and compresses with backpack cover, then successively
The core-spun yarn of the barium of antimony containing rare earth magnesium and the core-spun yarn of containing calcium silicon aluminium are fed, the stone after realizing the solidification of carbide-containing molten ductile cast iron
The refinement of tampon and carbide and isolated distribution.
A kind of outer processing method of furnace of carbide-containing molten ductile cast iron of the present invention, can be by following processing step come real
It is existing:
1. the first melting carbide-containing molten ductile cast iron in medium-frequency induction furnace or furnace cupola, and by the chemical group of molten iron
At and its mass fraction control in 3.34~3.75%C, 1.59~1.88%Si, 0.94~1.07%Cr, 0.45~0.64%
Mn, 1.09~1.26%Cu ,≤0.06%S ,≤0.08%P, Fe surplus；When molten iron temperature reaches 1483-1509 DEG C, by iron
Water is come out of the stove to nodularization packet；In the pit of nodularization packet bottom, it is pre-placed vermiculizer, has covered silicon steel sheet above vermiculizer, it will be compacted
Agent and silicon steel sheet shakeout tamping, and then tapping pre-spheroidizing is handled；Molten iron not be directly impinging addition vermiculizer when tapping
In pit；Vermiculizer additional amount accounts for the 0.45-0.55% into molten steel quality score in nodularization packet, and silicon steel sheet additional amount accounts for entrance
The 1.9-2.0% of molten steel quality score in nodularization packet；Pre-spheroidizing after reaction, the slag on molten iron surface is removed clean；
2. then by step 1. in nodularization packet and wrap in molten iron, be transferred to wire feeder feed silk position and with backpack cover pressure
Tightly, the 1# core-spun yarn of diameter 4.0-5.5mm is first fed with wire feeder, 1# core-spun yarn additional amount accounts for molten steel quality score in nodularization packet
0.6-0.8%；1# core-spun yarn all after feeding nodularization packet 3-5 minutes, continues the 2# core-spun yarn for feeding diameter 3.5-4.5mm,
2# core-spun yarn additional amount accounts for the 0.6-0.7% of molten steel quality score in nodularization packet；2# core-spun yarn is all fed nodularization packet 6-8 minutes
Afterwards, backpack cover is opened, is skimmed, when molten iron temperature is down to 1342-1367 DEG C, molten iron in nodularization packet is poured into casting mold, it is available to contain
Carbide spheroidal graphite cast-iron product.
The chemical composition and its mass fraction of vermiculizer as described above are 42.13-43.68%Si, 2.31-2.68%Ca,
9.48-10.55%RE, 4.24-4.80%Mg ,≤1.20%Al, surplus Fe.
The chemical composition and its mass fraction of silicon steel sheet as described above are 3.14-3.39%Si, 0.40-0.53%Al, <
0.08%C, < 0.15%Mn, < 0.03%P, < 0.01%S, surplus Fe.
The chemical composition and its mass fraction of 1# core-spun yarn as described above are 4.21-4.56%Mg, 0.45-0.69%La,
0.45-0.69%Ce, 2.68-3.23%Sb, 39.05-39.80%Si, 2.84-3.09%Ba, < 0.45%Al, < 0.45%
Ti, surplus Fe.
The chemical composition and its mass fraction of 2# core-spun yarn as described above are 58.37-58.94%Si, 4.16-4.70%
Ca, 10.38-10.61%Al, 1.20-1.55%N, 1.69-1.92%Ti, surplus Fe.
The outer processing method of a kind of furnace of carbide-containing molten ductile cast iron of the present invention, first in medium-frequency induction furnace or soaring
Melting carbide-containing molten ductile cast iron in furnace, and by the chemical composition of molten iron and its mass fraction control 3.34~3.75%
C, 1.59~1.88%Si, 0.94~1.07%Cr, 0.45~0.64%Mn, 1.09~1.26%Cu ,≤0.06%S ,≤
0.08%P, Fe surplus.0.94~1.07%Cr is wherein added, is mainly carbide using chromium, cast iron is added
In, in process of setting, (Cr, the Fe) of high rigidity can be generated3C and (Cr, Fe)7C3.When molten iron temperature reaches 1483-1509
DEG C when, molten iron is come out of the stove to nodularization packet.In the pit of nodularization packet bottom, it is pre-placed vermiculizer, the chemical composition of vermiculizer
And its mass fraction be 42.13-43.68%Si, 2.31-2.68%Ca, 9.48-10.55%RE, 4.24-4.80%Mg ,≤
1.20%Al, surplus Fe.Above-mentioned vermiculizer is added, so that molten iron is realized pre-spheroidizing, prevents molten iron from splashing, it can also be effective
Eliminate the shrinkage defect of casting.Silicon steel sheet is covered above vermiculizer, the chemical composition and its mass fraction of silicon steel sheet are 3.14-
3.39%Si, 0.40-0.53%Al, < 0.08%C, < 0.15%Mn, < 0.03%P, < 0.01%S, surplus Fe.Above vermiculizer
For covering silicon steel sheet other than it may insure that pre-spheroidizing reaction is gentle, there are also refine graphite nodule and eliminate the effect of graphite floatation.It will
Vermiculizer and silicon steel sheet shakeout tamping, and then tapping pre-spheroidizing is handled.Molten iron not be directly impinging addition vermiculizer when tapping
Pit in, prevent molten iron from splashing.Vermiculizer additional amount accounts for the 0.45- into molten steel quality score in nodularization packet
0.55%, silicon steel sheet additional amount accounts for the 1.9-2.0% into molten steel quality score in nodularization packet；Pre-spheroidizing after reaction, needs
The slag on molten iron surface is removed clean, it is ensured that subsequent molten iron treatment effect.
Molten iron after pre-spheroidizing is handled, then by nodularization packet and wrap in molten iron, be transferred to wire feeder feed silk position and with
Backpack cover compresses, first with the 1# core-spun yarn of wire feeder feeding diameter 4.0-5.5mm, the chemical composition and its mass fraction of 1# core-spun yarn
For 4.21-4.56%Mg, 0.45-0.69%La, 0.45-0.69%Ce, 2.68-3.23%Sb, 39.05-39.80%Si,
2.84-3.09%Ba, < 0.45%Al, < 0.45%Ti, surplus Fe.1# core-spun yarn additional amount accounts for molten steel quality score in nodularization packet
0.6-0.8%.1# core-spun yarn is added, it can be ensured that molten iron realizes good nodularization, and nodularization is not failed.1# core-spun yarn
All feeding nodularization packet 3-5 minute after, continue feeding diameter 3.5-4.5mm 2# core-spun yarn, the chemical composition of 2# core-spun yarn and
Its mass fraction is 58.37-58.94%Si, 4.16-4.70%Ca, 10.38-10.61%Al, 1.20-1.55%N, 1.69-
1.92%Ti, surplus Fe.2# core-spun yarn is added, graphite and carbide can be refined, promotes carbide in suspension and isolated distribution.
2# core-spun yarn additional amount accounts for the 0.6-0.7% of molten steel quality score in nodularization packet；2# core-spun yarn is all fed nodularization packet 6-8 minutes
Afterwards, backpack cover is opened, is skimmed, when molten iron temperature is down to 1342-1367 DEG C, molten iron in nodularization packet is poured into casting mold, it is available to contain
Carbide spheroidal graphite cast-iron product, spheroidization of graphite is good, and graphite nodule and carbide size are tiny, and are evenly distributed, and carbide is real
Existing suspension and isolated distribution.
Compared with prior art, the present invention having the following characteristics that
1) present invention processing molten iron, liquid iron balling is not in splash in the process, highly-safe；
2) present invention processing molten iron, the amount of skimming reduce 40% or more than the common spheronization process processing molten iron that pours, effectively protect
Environment is protected；
3) after present invention processing molten steel solidification, graphite nodule rate is high, and graphite nodule size is tiny, and is evenly distributed, carbide
In suspension and isolated distribution.
Detailed description of the invention
Graphite nodule distribution situation after 1 molten steel solidification of Fig. 1 embodiment of the present invention；
Microscopic structure after 1 molten steel solidification of Fig. 2 embodiment of the present invention.
Specific embodiment
The present invention is further described with reference to embodiments, but the present invention is not limited to following embodiments.
Embodiment 1:
A kind of outer processing method of the furnace of carbide-containing molten ductile cast iron, can be realized by following processing step:
1. the first melting carbide-containing molten ductile cast iron in 1500 kilograms of medium-frequency induction furnaces, and by the chemical group of molten iron
At and its mass fraction control 3.75%C, 1.59%Si, 1.07%Cr, 0.45%Mn, 1.26%Cu, 0.036%S,
0.057%P, Fe surplus；When molten iron temperature reaches 1509 DEG C, molten iron is come out of the stove to nodularization packet；In the pit of nodularization packet bottom,
It is pre-placed vermiculizer, the chemical composition and its mass fraction of the vermiculizer are 42.13%Si, 2.68%Ca, 9.48%
RE, 4.80%Mg, 1.03%Al, surplus Fe；Silicon steel sheet, the chemical composition and its quality of the silicon steel sheet are covered above vermiculizer
Score is 3.14%Si, 0.53%Al, 0.05%C, 0.11%Mn, 0.019%P, 0.008%S, surplus Fe；By vermiculizer and
Silicon steel sheet shakeouts tamping, and then tapping pre-spheroidizing is handled；Molten iron be not directly impinging in the pit of addition vermiculizer when tapping；
Vermiculizer additional amount accounts for 0.45% into molten steel quality score in nodularization packet, and silicon steel sheet additional amount is accounted for into molten iron in nodularization packet
The 1.9% of mass fraction；Pre-spheroidizing after reaction, the slag on molten iron surface is removed clean；
2. then by step 1. in nodularization packet and wrap in molten iron, be transferred to wire feeder feed silk position and with backpack cover pressure
Tightly, the 1# core-spun yarn of diameter 5.5mm is first fed with wire feeder, the chemical composition and its mass fraction of the 1# core-spun yarn are
4.56%Mg, 0.45%La, 0.69%Ce, 2.68%Sb, 39.80%Si, 2.84%Ba, 0.25%Al, 0.33%Ti, surplus
Fe；1# core-spun yarn additional amount accounts for 0.8% of molten steel quality score in nodularization packet；1# core-spun yarn all feeds nodularization packet after five minutes,
Continuing the 2# core-spun yarn of feeding diameter 3.5mm, the chemical composition and its mass fraction of the 2# core-spun yarn are 58.94%Si,
4.16%Ca, 10.61%Al, 1.20%N, 1.92%Ti, surplus Fe；2# core-spun yarn additional amount accounts for molten steel quality point in nodularization packet
Several 0.7%；2# core-spun yarn all after feeding nodularization packet 6 minutes, opens backpack cover, skims, will when molten iron temperature is down to 1367 DEG C
Molten iron pours into casting mold in nodularization packet, and available carbide-containing spheroidal graphite cast-iron product has graphite nodule rate height, graphite nodule and carbon
The advantages that compound size is tiny, and is evenly distributed, and carbide is in suspension and isolated distribution.
Embodiment 2:
A kind of outer processing method of the furnace of carbide-containing molten ductile cast iron, can be realized by following processing step:
1. the first melting carbide-containing molten ductile cast iron in 2 tons of furnace cupolas, and by the chemical composition and its quality of molten iron
Fractional domination is in 3.34%C, 1.88%Si, 0.94%Cr, 0.64%Mn, 1.09%Cu, 0.028%S, 0.051%P, more than Fe
Amount；When molten iron temperature reaches 1483 DEG C, molten iron is come out of the stove to nodularization packet；In the pit of nodularization packet bottom, it has been pre-placed compacted
Agent, the chemical composition and its mass fraction of the vermiculizer are 43.68%Si, 2.31%Ca, 10.55%RE, 4.24%Mg,
0.86%Al, surplus Fe；Silicon steel sheet is covered above vermiculizer, the chemical composition and its mass fraction of the silicon steel sheet are 3.39%
Si, 0.40%Al, 0.07%C, 0.12%Mn, 0.021%P, 0.006%S, surplus Fe；Vermiculizer and silicon steel sheet are shakeout and smash
Real, then tapping pre-spheroidizing is handled；Molten iron be not directly impinging in the pit of addition vermiculizer when tapping；Vermiculizer additional amount
It accounts for and enters 0.55% of molten steel quality score in nodularization packet, silicon steel sheet additional amount is accounted for into molten steel quality score in nodularization packet
2.0%；Pre-spheroidizing after reaction, the slag on molten iron surface is removed clean；
2. then by step 1. in nodularization packet and wrap in molten iron, be transferred to wire feeder feed silk position and with backpack cover pressure
Tightly, the 1# core-spun yarn of diameter 4.0mm is first fed with wire feeder, the chemical composition and its mass fraction of the 1# core-spun yarn are
4.21%Mg, 0.69%La, 0.45%Ce, 3.23%Sb, 39.05%Si, 3.09%Ba, 0.37%Al, 0.29%Ti, surplus
Fe；1# core-spun yarn additional amount accounts for 0.6% of molten steel quality score in nodularization packet；After 1# core-spun yarn is all fed nodularization packet 3 minutes,
Continuing the 2# core-spun yarn of feeding diameter 4.5mm, the chemical composition and its mass fraction of the 2# core-spun yarn are 58.37%Si,
4.70%Ca, 10.38%Al, 1.55%N, 1.69%Ti, surplus Fe；2# core-spun yarn additional amount accounts for molten steel quality point in nodularization packet
Several 0.6%；2# core-spun yarn all after feeding nodularization packet 8 minutes, opens backpack cover, skims, will when molten iron temperature is down to 1342 DEG C
Molten iron pours into casting mold in nodularization packet, and available carbide-containing spheroidal graphite cast-iron product has graphite nodule rate height, graphite nodule and carbon
The advantages that compound size is tiny, and is evenly distributed, and carbide is in suspension and isolated distribution.
Embodiment 3:
A kind of outer processing method of the furnace of carbide-containing molten ductile cast iron, can be realized by following processing step:
1. the first melting carbide-containing molten ductile cast iron in 1000 kilograms of medium-frequency induction furnaces, and by the chemical group of molten iron
At and its mass fraction control 3.51%C, 1.74%Si, 0.98%Cr, 0.53%Mn, 1.21%Cu, 0.042%S,
0.049%P, Fe surplus；When molten iron temperature reaches 1496 DEG C, molten iron is come out of the stove to nodularization packet；In the pit of nodularization packet bottom,
It is pre-placed vermiculizer, the chemical composition and its mass fraction of the vermiculizer are 42.60%Si, 2.57%Ca, 9.92%
RE, 4.57%Mg, 0.85%Al, surplus Fe；Silicon steel sheet, the chemical composition and its quality of the silicon steel sheet are covered above vermiculizer
Score is 3.28%Si, 0.49%Al, 0.05%C, 0.12%Mn, 0.018%P, 0.005%S, surplus Fe；By vermiculizer and
Silicon steel sheet shakeouts tamping, and then tapping pre-spheroidizing is handled；Molten iron be not directly impinging in the pit of addition vermiculizer when tapping；
Vermiculizer additional amount accounts for 0.5% into molten steel quality score in nodularization packet, and silicon steel sheet additional amount is accounted for into molten iron in nodularization packet
The 1.95% of mass fraction；Pre-spheroidizing after reaction, the slag on molten iron surface is removed clean；
2. then by step 1. in nodularization packet and wrap in molten iron, be transferred to wire feeder feed silk position and with backpack cover pressure
Tightly, the 1# core-spun yarn of diameter 4.5mm is first fed with wire feeder, the chemical composition and its mass fraction of the 1# core-spun yarn are
4.49%Mg, 0.52%La, 0.48%Ce, 2.90%Sb, 39.74%Si, 2.93%Ba, 0.18%Al, 0.12%Ti, surplus
Fe；1# core-spun yarn additional amount accounts for 0.7% of molten steel quality score in nodularization packet；After 1# core-spun yarn is all fed nodularization packet 4 minutes,
Continuing the 2# core-spun yarn of feeding diameter 4mm, the chemical composition and its mass fraction of the 2# core-spun yarn are 58.61%Si,
4.57%Ca, 10.44%Al, 1.39%N, 1.82%Ti, surplus Fe；2# core-spun yarn additional amount accounts for molten steel quality point in nodularization packet
Several 0.65%；2# core-spun yarn all after feeding nodularization packet 7 minutes, opens backpack cover, skims, when molten iron temperature is down to 1351 DEG C,
Molten iron in nodularization packet is poured into casting mold, available carbide-containing spheroidal graphite cast-iron product has that graphite nodule rate is high, graphite nodule and
The advantages that carbide size is tiny, and is evenly distributed, and carbide is in suspension and isolated distribution.
It is not in splash during liquid iron balling using carbide-containing molten ductile cast iron is handled outside furnace of the present invention, peace
Full property is very high；Molten iron is handled outside furnace of the present invention, the amount of skimming reduces 40% or more than the common spheronization process processing molten iron that pours, this
After invention processing molten steel solidification, graphite nodule rate is high, and graphite nodule and carbide size are tiny, and are evenly distributed, and carbide is in disconnected
Net and isolated distribution, can significantly improve the intensity and toughness of carbide-containing spheroidal graphite cast-iron, promoting and applying has good economy
And social benefit.
Claims (5)
1. a kind of outer processing method of furnace of carbide-containing molten ductile cast iron, which is characterized in that by following processing step come real
It is existing:
1. the first melting carbide-containing molten ductile cast iron in medium-frequency induction furnace or furnace cupola, and by the chemical composition of molten iron and
Its mass fraction control 3.34~3.75%C, 1.59~1.88%Si, 0.94~1.07%Cr, 0.45~0.64%Mn,
1.09~1.26%Cu ,≤0.06%S ,≤0.08%P, Fe surplus；When molten iron temperature reaches 1483-1509 DEG C, by molten iron
It comes out of the stove to nodularization packet；In the pit of nodularization packet bottom, it is pre-placed vermiculizer, has covered silicon steel sheet above vermiculizer, by compactedization
Agent and silicon steel sheet shakeout tamping, and then tapping pre-spheroidizing is handled；Molten iron not be directly impinging the recessed of addition vermiculizer when tapping
In hole；Vermiculizer additional amount accounts for the 0.45-0.55% into molten steel quality score in nodularization packet, and silicon steel sheet additional amount is accounted for into ball
Change the 1.9-2.0% of molten steel quality score in wrapping；Pre-spheroidizing after reaction, the slag on molten iron surface is removed clean；
2. then by step 1. in nodularization packet and wrap in molten iron, be transferred to wire feeder feed silk position and with backpack cover compress, first
With the 1# core-spun yarn of wire feeder feeding diameter 4.0-5.5mm, 1# core-spun yarn additional amount accounts for molten steel quality score in nodularization packet
0.6-0.8%；1# core-spun yarn all after feeding nodularization packet 3-5 minutes, continues the 2# core-spun yarn for feeding diameter 3.5-4.5mm, 2#
Core-spun yarn additional amount accounts for the 0.6-0.7% of molten steel quality score in nodularization packet；2# core-spun yarn is all fed nodularization packet 6-8 minutes
Afterwards, backpack cover is opened, is skimmed, when molten iron temperature is down to 1342-1367 DEG C, molten iron in nodularization packet is poured into casting mold, it is available to contain
Carbide spheroidal graphite cast-iron product.
2. a kind of outer processing method of the furnace of carbide-containing molten ductile cast iron described in accordance with the claim 1, which is characterized in that institute
State vermiculizer chemical composition and its mass fraction be 42.13-43.68%Si, 2.31-2.68%Ca, 9.48-10.55%RE,
4.24-4.80%Mg ,≤1.20%Al, surplus Fe.
3. a kind of outer processing method of the furnace of carbide-containing molten ductile cast iron described in accordance with the claim 1, which is characterized in that institute
State silicon steel sheet chemical composition and its mass fraction be 3.14-3.39%Si, 0.40-0.53%Al, < 0.08%C, < 0.15%
Mn, < 0.03%P, < 0.01%S, surplus Fe.
4. a kind of outer processing method of the furnace of carbide-containing molten ductile cast iron described in accordance with the claim 1, which is characterized in that institute
State 1# core-spun yarn chemical composition and its mass fraction be 4.21-4.56%Mg, 0.45-0.69%La, 0.45-0.69%Ce,
2.68-3.23%Sb, 39.05-39.80%Si, 2.84-3.09%Ba, < 0.45%Al, < 0.45%Ti, surplus Fe.
5. a kind of outer processing method of the furnace of carbide-containing molten ductile cast iron described in accordance with the claim 1, which is characterized in that institute
The chemical composition and its mass fraction for stating 2# core-spun yarn are 58.37-58.94%Si, 4.16-4.70%Ca, 10.38-10.61%
Al, 1.20-1.55%N, 1.69-1.92%Ti, surplus Fe.
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