CN104651705B - A kind of hypereutectic antiwear high-chromium cast iron and preparation method thereof - Google Patents
A kind of hypereutectic antiwear high-chromium cast iron and preparation method thereof Download PDFInfo
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Abstract
A kind of hypereutectic antiwear high-chromium cast iron and preparation method thereof, belongs to high-abrasive material technical field.Use the furnace charges such as electric induction furnace Scrap Smelting, carburant, ferrochrome, ferro-niobium, vanadium iron, ferrosilicon, ferromanganese, ferro-boron, metallic aluminium, obtain hypereutectic high chromium cast iron molten iron, during molten iron is come out of the stove, vanadium iron granule, Ferrotitanium particle and the ferrosilicon granule that particle size is 8～15mm is added with molten iron stream, addition is respectively and enters in casting ladle the 1.2～1.5%, 0.8～1.0% and 0.6～0.8% of molten steel quality mark, after molten iron casting becomes foundry goods, under as cast condition, tempering can use, and has superior abrasion resistance and production technology is easy.
Description
Technical field
The present invention relates to a kind of antiwear high-chromium cast iron and preparation method thereof, particularly to a kind of hypereutectic wear-resisting Gao Ge
Cast iron and preparation method thereof, belongs to high-abrasive material technical field.
Background technology
Due to containing a large amount of high rigidity M in rich chromium cast iron7C3Type carbide and there is excellent wearability, at present
It is applied widely in fields such as metallurgy, mine, building materials, electric power and chemical industry.In order to improve rich chromium cast iron
Wearability, Chinese invention patent CN 104195420 discloses a kind of rich chromium cast iron high-abrasive material and heat treatment side
Method, with ferrum as primary raw material, and be equipped with carbon, silicon, manganese, sulfur, phosphorus, chromium, molybdenum, nickel, copper are auxiliary material,
After preparation, melting and casting forms, it is characterised in that each chemical component weight percent in liquation particularly as follows:
C2.9-3.1%, Si0.5-0.8%, Mn0.8-1.0%, S0.02-0.05%, P0.02-0.05%, Cr19-21%,
Mo1.7-1.9%, Ni0.5-0.7%, Cu0.2-0.5%, surplus is Fe.This invention improves the performance of rich chromium cast iron
And using effect, thus increase the field yield such as metallurgy, mine, building materials, colliery, the use week of extension device
Phase, production efficiency is made to be greatly enhanced.Chinese invention patent CN 104164612 also discloses a kind of Gao Ge
Cast iron die and preparation method thereof, each composition and mass percent thereof be: C:2.4 2.5%, Cr:13
13.5%, Mn:0.8 0.9%, Si:1.05 1.1%, Cu:0.4 0.5%, Ni:0.5 0.6%,
B:0.03 0.04%, Re:0.02 0.03%, S :≤0.04%, P :≤0.04%；Surplus is Fe.
The rich chromium cast iron mould of this invention, even tissue, designed by rational formula, rational melting, casting,
The processing technique such as heat treatment, it is to avoid shrinkage porosite, the generation of shrinkage cavity, the effective mechanical performance improving mould, firmly
Degree: 63 65HRC, wearability is good, good toughness, impact value >=8J/cm2, improve 1.5 2 service life
Times, low cost.Chinese invention patent CN 104131219 also discloses a kind of rich chromium cast iron foundry goods, by as follows
Composition and mass percent composition: C:3.05 3.1%, Mn:0.76 0.8%, Si:0.6 0.7%,
Cr:10.6 11%, B:1.2 1.4%, Cu:0.08 0.1%, V:1.2 1.4%, Ni:0.06
0.08%, P :≤0.02%, S :≤0.02%, surplus is Fe.This invention is cast by rationally improving high chromium
Each composition proportion of iron castings, by processing technique such as rational melting, casting, heat treatments, improves foundry goods
Intensity, toughness, wearability, by casting time, the control of sand mold temperature, prevent the product of shrinkage porosite, shrinkage cavity
Raw, also improve toughness and the wearability of foundry goods, tensile strength is 480 500MPa.Chinese invention patent
CN 104131218 also discloses a kind of extra-high chrome cast iron, each composition and percentage by weight: C:2.9 3.0
%, Cr:26 27%, Mn:0.8 0.9%, Si:1.05 1.2%, Cu:0.8 0.9%, Ni:
0.8 0.9%, B:0.003 0.004%, Ti:0.01 0.02%, Re:0.025 0.035%, S:
≤ 0.045%, P :≤0.055%；Surplus is Fe.This invention rich chromium cast iron is designed by rational formula, melts
The processing technique such as refining, rotten, cast, deoxidation, allow rich chromium cast iron have good wearability, hardness, intensity,
Corrosion resistance, toughness, by the duration of pouring, the control of sand mold temperature, effectively prevent the product of shrinkage porosite, shrinkage cavity
Raw, also improve toughness and the wearability of rich chromium cast iron, case hardness 60 63HRC, impact value >=7J/cm2。
Chinese invention patent CN 103993218 also discloses large-sized grinder rich chromium cast iron trench liner and preparation side thereof
Method, including the chemical composition of following percentage by weight: carbon 2.2 2.8%, silicon 0.3 0.8%, manganese 0.6 1.2
%, chromium 15 20%, magnesium 2.0 3.0%, molybdenum 0.3 1.0%, nickel 0.1 0.2%, copper 0.3 0.8%,
Vanadium 0.08 0.25%, sulfur 0.005 0.025%, phosphorus 0.005 0.025%, yttrium 0.005 0.03%, remaining
Amount is ferrum.This invention is the longest for service life, and while improving wearability, impact toughness is also greatly improved, full
The impact resistance of foot large-sized grinder liner plate.Chinese invention patent CN 103409681 also discloses the casting of a kind of high chromium
Ferrum, the thin-wall pipe being made from and the preparation method of this thin-wall pipe.Wherein, the raw material components of rich chromium cast iron
Weight percentage proportioning is as follows: C:2.7%～3.4%, Cr:23%～32%, Mo:0.2%～0.4%,
Ni:0.1%～0.3%, V:0.6%～1.1%, Mn:0.3%～0.5%, Si:0.8%～1.1%, P:
≤ 0.05%, S :≤0.05%, and the Fe of surplus；Wherein, Cr and C content meet formula: 4.2%≤
[C] wt.%+0.0474 × [Cr] wt.%≤4.5%.Gao Ge prepared by the raw material components proportioning utilizing this invention to provide
Cast iron prepares rich chromium cast iron thin-wall pipe, and yield rate is high, and anti-wear performance is good so that the wearability of rich chromium cast iron
Can play one's part to the full in slim pipe fitting.Chinese invention patent CN 103266261 also discloses a kind of Gao Ge
Cast iron abrasive body and preparation method thereof, described abrasive body chemical composition by weight percentage is: C:2.5～2.8
%, Si≤0.5%, Mn:0.15～0.25%, Mo:0～2.5%, Cr:15～20%, Al:0.01～
0.8%, Ni:0.05～0.10%, Re:0.1～0.2%, P≤0.05%, S≤0.05%, surplus is Fe,
The employing cast grinding ball material formula that is mainly characterized by of this invention obtains with effectively combining of Technology for Heating Processing science
Nano-milled material hardness HRC >=65, percentage of damage≤0.3%, cast gate center and centre of sphere HRC be poor≤1.5,
Solve high-abrasive material cast grinding ball industry research and development present in cast grinding ball hardness low, poor toughness, corrosion resistance
Weak, consistency is low waits technical barrier.
But, in above-mentioned high-chromium abrasion-proof cast iron, the M of high rigidity7C3Type carbide negligible amounts, is used for preparing
The various conveyings flow passage part (such as impeller, sheath and backplate etc.) containing solid particle fluid pump, wearability still shows not
Foot.In order to improve wear resistance of high-chromium iron further, hypereutectic high chromium cast iron causes attention, and Chinese invention is special
Profit CN 102925783 discloses the preparation method of a kind of hypereutectic high-chromium white cast iron, comprises the following steps:
Employing steel scrap, the pig iron, high carbon ferro-chrome, ferromanganese and ferrosilicon are as melting raw material, by following percentage by weight
Chemical composition: 3.0-4.5%C, 15-35%Cr, 0.5-1.5%Mn, 0.5-1.5%Si, ＜ 0.06%P, ＜
0.06%S, remaining carries out dispensing for Fe；Raw material melt in electric furnace after deoxidation, then casting liquid is come out of the stove rapidly
Pour casting ladle into；When temperature is down to 1300 DEG C-1350 DEG C, pour casting liquid into sand mold castable；Foundry goods is put
Entering to be heated in electric furnace 700 DEG C～1000 DEG C insulations, coming out of the stove the most rapidly to put into is carried out at forging deformation on forging machine
Reason；Finally forging is carried out temper, finally give hypereutectic high chromium cast iron.Chinese invention patent CN
The 102851570 high carbon and chromium abrasive disc foundry goods also disclosing defibrator, for hypereutectic high chromium cast iron, are containing height
While chromium and containing high-carbon, main chemical compositions is ferrum, based on percent mass, carbon content 3.6-3.8%, chromium
Content 28.0-30.0%, nickel content≤0.8%, molybdenum content≤0.5%, Fe content≤0.8%, copper content≤0.2
% and a certain amount of silicon and the phosphorus of low content, sulfur, this beneficial effect of the invention is: the nascent Hard Inclusion of product
Cr7C3Type carbide increases, and makes abrasive disc wearability improve more than 30%；The precious metals such as nickel, molybdenum, manganese, copper
Content declines, and makes production cost decline；Phosphorus, sulfur content decline, and make toughness increase；Comprehensive mechanical performance obtains
To improving, its hardness reaches HRC62-65, can be widely used for fibre board raw materials such as timber, bagasse, cotton stalks
Carrying out defibrination processing, it is multiple that abrasive disc can bear low stress abrasion, fatigue wear, corrosive wear, high temperature wear etc.
Abrasion, and the destruction of external force can also be resisted, improve more than 30% service life.Chinese invention patent CN
101497966 also disclose a kind of high rigidity hypereutectic high chromium, manganese, molybdenum and tungsten alloy wear resistant steel iron material, under containing
The chemical composition of row mass percent: carbon 3.05～5.5%, silicon 0.3～2.0%, chromium 35.5～40%, manganese
0.3～3.5%, molybdenum 0.1～3.5%, tungsten 0.1～3.5%, phosphorus≤0.1%, sulfur≤0.1%, surplus is ferrum.In
State's patent of invention CN 1769508 also discloses a kind of hypereutectic high chromium cast iron and manufacture method, hypereutectic height
Being mainly composed of of chrome cast iron: C:3.5～4.5%, Mn:1.0～3.0%, Cr:
17～30%, Si:0.5～1.5%, Cu:1.0～2.0%, P :≤0.0
6%, S :≤0.06%, Ni :≤1%, surplus is ferrum.With hypereutectic high chromium cast iron manufacture
Wet Parts of slurry pump, production technology is easy, low cost, and castability is good, has excellent wearability and high making
Use the life-span.Chinese invention patent CN 101892417 also discloses the hypereutectic high chromium cast iron that a kind of as cast condition uses,
The chemical composition of hypereutectic high chromium cast iron that this as cast condition uses is calculated in weight percent is: C:3.5～
4.5%, Mn:1.0～3.0%, Cr:16.0～28.0%, Si:0.5～
1.5%, Ti:2.1～3.0%, P :≤0.06%, S :≤0.06%,
Surplus is ferrum.This as cast condition use hypereutectic high chromium cast iron tapping temperature 1500～1650 DEG C, cast
Temperature 1350～1400 DEG C, good casting property, also there is higher hardness and excellent wearability.Specially
Profit WO4047760-A1 and EP147422-A1 also discloses a kind of wear-resisting hypereutectic high chromium cast iron, and it is main
Composition for (wt.%) is: C > 4.0, Mn:0～15%, Cr:25.0～45.0%, Mo:0～10%,
Ni:0～10%, B:0～0.2%, Ti, V, W, Ta and Nb at least add one, every kind of element
Addition is less than 5.0% and the total amount of Ti, V, W, Ta and Nb is less than 15.0%:0.06%, S:
0.06%, surplus is ferrum.Chinese invention patent CN 103789600 also discloses a kind of hypereutectic high-chromium casting
Iron Preparation Method, the chemical composition of hypereutectic high chromium cast iron molten iron and mass fraction thereof are 4.0～4.3%C,
25.0～28.0%Cr, 0.3～0.8%Si, 1.2～1.5%Mn, 0.08～0.15%N, 0.05～0.10%Al,
S≤0.04%, P≤0.05%, surplus Fe.When the temperature of above-mentioned molten iron reaches 1520～1550 DEG C, by ferrum
Water is come out of the stove into casting ladle.Then sending in the molten iron in casting ladle with wire feeder by the alloy wire of diameter, alloy wire adds
Amount accounts in casting ladle the 4.0～5.5% of molten steel quality mark, and molten iron pours into casting mold obtains foundry goods, and foundry goods is through quenching
After fire and tempering, there is good wearability.But, above-mentioned hypereutectic high chromium cast iron or to there is preparation technology multiple
Miscellaneous, or there is the thick deficiency causing material fragility big of carbide.
Summary of the invention
It is an object of the present invention to provide a kind of exceed containing volume fraction 50% hypereutectic antiwear high-chromium cast iron, this
Invent on the basis of increasing carbide volume fraction, add multiple alloying element, make carbide size tiny, point
Cloth is uniform, it is ensured that the safe handling of hypereutectic high chromium cast iron.
The object of the invention can be realized by following technological measure:
1. first Scrap Smelting, carburant, ferrochrome, ferro-niobium, vanadium iron, ferrosilicon, ferromanganese, boron in electric induction furnace
The furnace charge such as ferrum, metallic aluminium, obtains hypereutectic high chromium cast iron molten iron, by the chemical group of hypereutectic high chromium cast iron molten iron
Become and mass fraction control 4.8～5.0%C, 28～30%Cr, 2.0～2.5%Nb, 3.5～4.0%V,
0.3～1.0%Si, 0.5～0.8%Mn, 0.65～0.80%B, and 0.6～0.8%Al, S < 0.04%, P < 0.05%, surplus
Fe, when molten iron temperature reaches 1565～1590 DEG C of casting ladles of coming out of the stove, during molten iron is come out of the stove, adds with molten iron stream
Particle size is vanadium iron granule, Ferrotitanium particle and the ferrosilicon granule of 8～15mm, vanadium iron granule, Ferrotitanium particle and
The addition of ferrosilicon granule is respectively and enters 1.2～1.5%, 0.8～1.0% and of molten steel quality mark in casting ladle
0.6～0.8%；
2., when molten iron temperature is down to 1480～1500 DEG C in casting ladle, molten iron is poured into casting mold, and in molten iron casting
During, adding aluminum bag WC powder with molten iron stream, the particle size of aluminum bag WC powder is 30～45 μm, aluminum bag
Coating thickness is 7～10 μm, and aluminum bag WC powder addition accounts for and enters in casting mold the 5.5～6.0% of molten steel quality mark,
Molten iron casting 4～after 8 hours, unpacks and takes out foundry goods, after polishing cleaning, continues to be heated to 360～400 into stove
DEG C, after being incubated 10～15 hours, stove is cooled to temperature less than after 120 DEG C, and air cooling of coming out of the stove, to room temperature, can obtain
Eutectic antiwear high-chromium cast iron.
Chemical composition and the mass fraction of vanadium iron granule is as mentioned above: 48～55%V ,≤0.40%C ,≤0.06%P,
≤ 0.04%S ,≤2.0%Si ,≤1.5%Al, surplus Fe.
Chemical composition and the mass fraction of Ferrotitanium particle is as mentioned above: 30～35%Ti ,≤4.0%Al ,≤2.0%Si,
≤ 0.03%S ,≤0.03%P ,≤0.10%C ,≤0.40%Cu ,≤2.5%Mn, surplus Fe.
Chemical composition and the mass fraction thereof of ferrosilicon granule is as mentioned above: 73.0～78.0%Si ,≤0.5%Al,
≤ 1.0%Ca ,≤0.4%Mn ,≤0.3%Cr ,≤0.035%P ,≤0.02%S ,≤0.10%C, surplus Fe.
The hypereutectic antiwear high-chromium cast iron of the present invention, uses casting method to produce, simple process, employing ordinary scrap steel,
The furnace charges such as carburant, ferrochrome, ferro-niobium, vanadium iron, ferrosilicon, ferromanganese, ferro-boron, metallic aluminium are molten in electric induction furnace
Refining, obtains hypereutectic high chromium cast iron molten iron, by chemical composition and the mass fraction thereof of hypereutectic high chromium cast iron molten iron
Control 4.8～5.0%C, 28～30%Cr, 2.0～2.5%Nb, 3.5～4.0%V, 0.3～1.0%Si, 0.5～0.8%Mn,
0.65～0.80%B, and 0.6～0.8%Al, S < 0.04%, P < 0.05%, surplus Fe.Wherein adding 28～30%Cr is
In order to obtain the M of more high rigidity7C3Type carbide, is conducive to improving cast iron wearability, additionally, add
28～30%Cr are present to ensure that the Cr/C ratio of cast iron is more than 5, it is ensured that carbide is M7C3.On this basis,
Add 2.0～2.5%Nb and 3.5～4.0%V, in order to obtain high rigidity (V, Nb) C double carbide,
Be conducive to improving further cast iron wearability.Add 0.65～0.80%B, except boron enters carbide, thus carry
Outside high-carbon metalization hardness, part of boron enters matrix, can increase substantially matrix quenching degree, it is ensured that cast iron as cast condition
High rigidity, is conducive to saving the high-temperature heat treatment process that energy consumption is high.Add 0.6～0.8%Al, be conducive to improving
Carbide morphology.The present invention reaches 1565～1590 DEG C of casting ladles of coming out of the stove when molten iron temperature, during molten iron is come out of the stove,
With molten iron stream add particle size be 8～15mm vanadium iron granule, Ferrotitanium particle and ferrosilicon granule, vanadium iron granule,
The addition of Ferrotitanium particle and ferrosilicon granule be respectively enter molten steel quality mark in casting ladle 1.2～1.5%,
0.8～1.0% and 0.6～0.8%.Add vanadium iron granule, Ferrotitanium particle and ferrosilicon granule, except alloying action,
Improve the tiny of cast iron wearability, the also improvement to structure of cast iron, particularly solidified structure and be evenly distributed bright
Aobvious benefit.On this basis, when molten iron temperature is down to 1480～1500 DEG C in casting ladle, molten iron is poured into casting
Type, and in molten steel pouring course, add aluminum bag WC powder, the particle size of aluminum bag WC powder with molten iron stream
Being 30～45 μm, aluminum coating thickness is 7～10 μm, and aluminum bag WC powder addition accounts for molten iron matter in entrance casting mold
The 5.5～6.0% of amount mark.Add aluminum bag WC powder, cast iron wearability can be significantly improved, it is also possible to refinement is solidifying
Gu tissue, improve cast iron obdurability.Molten iron casting 4～after 8 hours, unpacks and takes out foundry goods, after polishing cleaning,
Continuing to be heated to 360～400 DEG C into stove, after being incubated 10～15 hours, stove is cooled to temperature less than after 120 DEG C, comes out of the stove
Air cooling, to room temperature, can eliminate foundry goods internal stress, thus can obtain the hypereutectic high chromium cast iron that anti-wear performance is excellent.
The present invention compared with prior art, has the following characteristics that
1), in the hypereutectic antiwear high-chromium cast iron of the present invention, the volume fraction of anti-abrasive hard tissue carbide reaches
55～62%, cause material to have the wearability of excellence；
2) present invention hypereutectic antiwear high-chromium cast iron production technology is easy, and under as cast condition, tempering can use, and has
Production efficiency is high, the advantages such as energy consumption is low.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is further described, but the present invention is not limited to following example.
Embodiment 1:
A kind of hypereutectic antiwear high-chromium cast iron and preparation method thereof, uses 500 kilograms of medium-frequency induction furnace meltings,
Concrete step of preparation process is:
1. first Scrap Smelting, carburant, ferrochrome, ferro-niobium, vanadium iron, silicon in 500 kilograms of medium-frequency induction furnaces
The furnace charges such as ferrum, ferromanganese, ferro-boron, metallic aluminium, obtain hypereutectic high chromium cast iron molten iron, by hypereutectic high chromium cast iron
The chemical composition of molten iron and mass fraction thereof control at 4.82%C, 28.17%Cr, 2.06%Nb, 3.99%V,
0.56%Si, 0.79%Mn, 0.80%B, 0.63%Al, 0.033%S, 0.045%P, surplus Fe, when molten iron temperature reaches
To 1589 DEG C of casting ladles of coming out of the stove, during molten iron is come out of the stove, adding particle size with molten iron stream is 8～15mm
Vanadium iron granule (chemical composition of vanadium iron granule and mass fraction be: 48.94%V, 0.27%C, 0.038%P,
0.025%S, 1.29%Si, 1.04%Al, surplus Fe), Ferrotitanium particle (chemical composition of Ferrotitanium particle and quality
Mark is: 34.62%Ti, 2.58%Al, 1.36%Si, 0.020%S, 0.027%P, 0.054%C, 0.15%Cu,
2.17%Mn, surplus Fe) and ferrosilicon granule (chemical composition of ferrosilicon granule and mass fraction thereof be: 75.84%Si,
0.31%Al, 0.59%Ca, 0.24%Mn, 0.16%Cr, 0.033%P, 0.012%S, 0.074%C, surplus Fe),
Molten steel quality mark in the addition of vanadium iron granule, Ferrotitanium particle and ferrosilicon granule respectively entrance casting ladle
1.2%, 1.0% and 0.6%；
2., when molten iron temperature is down to 1488 DEG C in casting ladle, molten iron is poured into casting mold, and at molten steel pouring course
In, adding aluminum bag WC powder with molten iron stream, the particle size of aluminum bag WC powder is 30～45 μm, aluminum clad
Thickness is 7～10 μm, and aluminum bag WC powder addition accounts for and enters in casting mold the 5.5% of molten steel quality mark, and molten iron waters
After note 6 hours, unpack and take out foundry goods, after polishing cleaning, continue to be heated to 360 DEG C into stove, be incubated 15
After hour, stove is cooled to temperature less than after 120 DEG C, and air cooling of coming out of the stove, to room temperature, can obtain the casting of hypereutectic wear-resisting high chromium
Ferrum, its mechanical property is shown in Table 1.
Embodiment 2:
A kind of hypereutectic antiwear high-chromium cast iron and preparation method thereof, uses 1000 kilograms of medium-frequency induction furnace meltings,
Concrete step of preparation process is:
1. first in 1000 kilograms of medium-frequency induction furnaces Scrap Smelting, carburant, ferrochrome, ferro-niobium, vanadium iron,
The furnace charges such as ferrosilicon, ferromanganese, ferro-boron, metallic aluminium, obtain hypereutectic high chromium cast iron molten iron, are cast by hypereutectic high-chromium
The chemical composition of ferrum molten iron and mass fraction thereof control at 4.97%C, 29.91%Cr, 2.47%Nb, 3.50%V,
0.89%Si, 0.54%Mn, 0.66%B, 0.75%Al, 0.036%S, 0.040%P, surplus Fe, when molten iron temperature reaches
To 1567 DEG C of casting ladles of coming out of the stove, during molten iron is come out of the stove, adding particle size with molten iron stream is 8～15mm
Vanadium iron granule (chemical composition of vanadium iron granule and mass fraction be: 54.27%V, 0.28%C, 0.047%P,
0.029%S, 1.04%Si, 0.97%Al, surplus Fe), Ferrotitanium particle (chemical composition of Ferrotitanium particle and quality
Mark is: 30.80%Ti, 2.55%Al, 1.37%Si, 0.023%S, 0.026%P, 0.094%C, 0.21%Cu,
2.14%Mn, surplus Fe) and ferrosilicon granule (chemical composition of ferrosilicon granule and mass fraction thereof be: 74.14%Si,
0.28%Al, 0.65%Ca, 0.19%Mn, 0.11%Cr, 0.030%P, 0.015%S, 0.082%C, surplus Fe),
Molten steel quality mark in the addition of vanadium iron granule, Ferrotitanium particle and ferrosilicon granule respectively entrance casting ladle
1.5%, 0.8% and 0.8%；
2., when molten iron temperature is down to 1497 DEG C in casting ladle, molten iron is poured into casting mold, and at molten steel pouring course
In, adding aluminum bag WC powder with molten iron stream, the particle size of aluminum bag WC powder is 30～45 μm, aluminum clad
Thickness is 7～10 μm, and aluminum bag WC powder addition accounts for and enters in casting mold the 6.0% of molten steel quality mark, and molten iron waters
After note 4 hours, unpack and take out foundry goods, after polishing cleaning, continue to be heated to 400 DEG C into stove, be incubated 10
After hour, stove is cooled to temperature less than after 120 DEG C, and air cooling of coming out of the stove, to room temperature, can obtain the casting of hypereutectic wear-resisting high chromium
Ferrum, its mechanical property is shown in Table 1.
Embodiment 3:
A kind of hypereutectic antiwear high-chromium cast iron and preparation method thereof, uses 1000 kilograms of medium-frequency induction furnace meltings,
Concrete step of preparation process is:
1. first in 1000 kilograms of medium-frequency induction furnaces Scrap Smelting, carburant, ferrochrome, ferro-niobium, vanadium iron,
The furnace charges such as ferrosilicon, ferromanganese, ferro-boron, metallic aluminium, obtain hypereutectic high chromium cast iron molten iron, are cast by hypereutectic high-chromium
The chemical composition of ferrum molten iron and mass fraction thereof control at 4.93%C, 28.84%Cr, 2.33%Nb, 3.76%V,
0.45%Si, 0.62%Mn, 0.69%B, 0.72%Al, 0.028%S, 0.037%P, surplus Fe, when molten iron temperature reaches
To 1583 DEG C of casting ladles of coming out of the stove, during molten iron is come out of the stove, adding particle size with molten iron stream is 8～15mm
Vanadium iron granule (chemical composition of vanadium iron granule and mass fraction be: 52.41%V, 0.31%C, 0.053%P,
0.035%S, 1.78%Si, 1.16%Al, surplus Fe), Ferrotitanium particle (chemical composition of Ferrotitanium particle and quality
Mark is: 32.06%Ti, 3.16%Al, 1.05%Si, 0.026%S, 0.025%P, 0.084%C, 0.19%Cu,
1.77%Mn, surplus Fe) and ferrosilicon granule (chemical composition of ferrosilicon granule and mass fraction thereof be: 76.04%Si,
0.30%Al, 0.70%Ca, 0.21%Mn, 0.15%Cr, 0.032%P, 0.019%S, 0.057%C, surplus Fe),
Molten steel quality mark in the addition of vanadium iron granule, Ferrotitanium particle and ferrosilicon granule respectively entrance casting ladle
1.4%, 0.9% and 0.7%；
2., when molten iron temperature is down to 1481 DEG C in casting ladle, molten iron is poured into casting mold, and at molten steel pouring course
In, adding aluminum bag WC powder with molten iron stream, the particle size of aluminum bag WC powder is 30～45 μm, aluminum clad
Thickness is 7～10 μm, and aluminum bag WC powder addition accounts for and enters in casting mold the 5.8% of molten steel quality mark, and molten iron waters
After note 8 hours, unpack and take out foundry goods, after polishing cleaning, continue to be heated to 380 DEG C into stove, be incubated 12
After hour, stove is cooled to temperature less than after 120 DEG C, and air cooling of coming out of the stove, to room temperature, can obtain the casting of hypereutectic wear-resisting high chromium
Ferrum, its mechanical property is shown in Table 1.
Table 1 hypereutectic antiwear high-chromium cast iron mechanical property
| Mechanical property | Hardness/HRC | Impact flexibility (J/cm2) | Carbide volume fraction/% |
| Embodiment 1 | 65.7 | 5.7 | 55.9 |
| Embodiment 2 | 65.8 | 5.8 | 58.2 |
| Embodiment 3 | 66.3 | 5.2 | 61.4 |
Hypereutectic high chromium cast iron hardness of the present invention is high, good toughness, the particularly volume integral of anti-abrasive hard tissue carbide
Number reaches 55～62%, has the wearability of excellence, at the MLS 225 type wheeled abrasion tester of damp sand rubber
On wear test result show, the wearability of material of the present invention than common Hypoeutectic High Cr Cast Iron improve 3～4
Times, can be used for manufacturing conveying and there are all kinds of mills of strong wear slurry Wet Parts of slurry pump and other wear working condition
Damage parts.
Claims (5)
1. the preparation method of a hypereutectic antiwear high-chromium cast iron, it is characterised in that comprise the following steps:
1. first Scrap Smelting, carburant, ferrochrome, ferro-niobium, vanadium iron, ferrosilicon, ferromanganese, ferro-boron, metallic aluminium in electric induction furnace
Furnace charge, obtains hypereutectic high chromium cast iron molten iron, chemical composition and the mass fraction thereof of hypereutectic high chromium cast iron molten iron is controlled
4.8～5.0%C, 28～30%Cr, 2.0～2.5%Nb, 3.5～4.0%V, 0.3～1.0%Si, 0.5～0.8%Mn, 0.65～0.80%B,
< < 0.05%, surplus Fe, when molten iron temperature reaches 1565～1590 DEG C of casting ladles of coming out of the stove, and molten iron goes out for 0.04%, P for 0.6～0.8%Al, S
During stove, with molten iron stream add particle size be 8～15mm vanadium iron granule, Ferrotitanium particle and ferrosilicon granule, vanadium iron granule,
The addition of Ferrotitanium particle and ferrosilicon granule is respectively and enters 1.2～1.5%, 0.8～1.0% and of molten steel quality mark in casting ladle
0.6～0.8%；
2., when molten iron temperature is down to 1480～1500 DEG C in casting ladle, molten iron is poured into casting mold, and in molten steel pouring course, with
Molten iron stream adds aluminum bag WC powder, and the particle size of aluminum bag WC powder is 30～45 μm, and aluminum coating thickness is 7～10 μm, aluminum
Bag WC powder addition accounts for and enters in casting mold the 5.5～6.0% of molten steel quality mark, molten iron casting 4～after 8 hours, unpacks and takes out casting
Part, after polishing cleaning, continues to be heated to 360～400 DEG C into stove, and after be incubated 10～15 hours, stove is cooled to temperature and is less than after 120 DEG C,
Air cooling of coming out of the stove, to room temperature, can obtain hypereutectic antiwear high-chromium cast iron.
2. according to the method for claim 1, it is characterised in that chemical composition and the mass fraction of described vanadium iron granule be:
48～55%V ,≤0.40%C ,≤0.06%P ,≤0.04%S ,≤2.0%Si ,≤1.5%Al, surplus Fe.
3. according to the method for claim 1, it is characterised in that the chemical composition of described Ferrotitanium particle and mass fraction be:
30～35%Ti ,≤4.0%Al ,≤2.0%Si ,≤0.03%S ,≤0.03%P ,≤0.10%C ,≤0.40%Cu ,≤2.5%Mn, surplus Fe.
4. according to the method for claim 1, it is characterised in that chemical composition and the mass fraction thereof of described ferrosilicon granule be:
73.0～78.0%Si ,≤0.5%Al ,≤1.0%Ca ,≤0.4%Mn ,≤0.3%Cr ,≤0.035%P ,≤0.02%S ,≤0.10%C, surplus
Fe。
5. the hypereutectic antiwear high-chromium cast iron prepared according to the either method of claim 1-4.
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| CN111299518A (en) * | 2020-03-17 | 2020-06-19 | 中信重工机械股份有限公司 | Casting method of high-chromium cast iron spiral lining plate |
| CN114657450A (en) * | 2022-03-19 | 2022-06-24 | 江西耐普矿机铸造有限公司 | Hypereutectic ultrahigh-chromium cast iron material suitable for fine-particle industrial mines, preparation method and application thereof, and slurry pump overflowing piece |
| CN115537642B (en) * | 2022-10-30 | 2023-05-02 | 北京工业大学 | Refining method of hypereutectic high-chromium cast iron primary carbide |
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