CN104164607B - Spheroidising method of high-nickel nodular cast iron - Google Patents
Spheroidising method of high-nickel nodular cast iron Download PDFInfo
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- CN104164607B CN104164607B CN201310183108.4A CN201310183108A CN104164607B CN 104164607 B CN104164607 B CN 104164607B CN 201310183108 A CN201310183108 A CN 201310183108A CN 104164607 B CN104164607 B CN 104164607B
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- casting ladle
- molten iron
- furnace
- spheroidising
- inoculation
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- 238000000034 method Methods 0.000 title claims abstract description 79
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 title claims abstract description 24
- 229910052759 nickel Inorganic materials 0.000 title claims abstract description 18
- 229910001141 Ductile iron Inorganic materials 0.000 title abstract description 9
- 238000005266 casting Methods 0.000 claims abstract description 80
- 238000005516 engineering process Methods 0.000 claims abstract description 10
- 238000002844 melting Methods 0.000 claims abstract description 9
- 230000008018 melting Effects 0.000 claims abstract description 9
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 113
- 229910052742 iron Inorganic materials 0.000 claims description 56
- 229910001018 Cast iron Inorganic materials 0.000 claims description 25
- 238000011081 inoculation Methods 0.000 claims description 21
- 238000003723 Smelting Methods 0.000 claims description 20
- 239000004576 sand Substances 0.000 claims description 17
- 239000002893 slag Substances 0.000 claims description 16
- 239000000203 mixture Substances 0.000 claims description 11
- 239000000126 substance Substances 0.000 claims description 10
- 229910000861 Mg alloy Inorganic materials 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 claims description 5
- ATTFYOXEMHAYAX-UHFFFAOYSA-N magnesium nickel Chemical group [Mg].[Ni] ATTFYOXEMHAYAX-UHFFFAOYSA-N 0.000 claims description 4
- 238000009738 saturating Methods 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 229910000882 Ca alloy Inorganic materials 0.000 claims description 2
- 238000012545 processing Methods 0.000 claims description 2
- 239000002054 inoculum Substances 0.000 abstract description 3
- 238000005563 spheronization Methods 0.000 description 10
- 229910001566 austenite Inorganic materials 0.000 description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- 229910045601 alloy Inorganic materials 0.000 description 6
- 239000000956 alloy Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 239000011347 resin Substances 0.000 description 6
- 229920005989 resin Polymers 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 230000007812 deficiency Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 229910002804 graphite Inorganic materials 0.000 description 5
- 239000010439 graphite Substances 0.000 description 5
- 238000007531 graphite casting Methods 0.000 description 5
- 239000011777 magnesium Substances 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 4
- 229910052749 magnesium Inorganic materials 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 4
- 229910018487 Ni—Cr Inorganic materials 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical group [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 229910052761 rare earth metal Inorganic materials 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 229910001021 Ferroalloy Inorganic materials 0.000 description 1
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- 229910007981 Si-Mg Inorganic materials 0.000 description 1
- 229910008316 Si—Mg Inorganic materials 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- -1 carburant Inorganic materials 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 235000000396 iron Nutrition 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention discloses a spheroidising method of high-nickel nodular cast iron. The method is characterized in that a medium-frequency furnace is adopted to carry out melting, spheroidising is performed in a melting furnace, and a casting ladle whose bottom contains a technological amount of inoculant is adopted to carry out an inoculant treatment; and has the characteristics of reasonable method, convenient operation, safe environment, and good quality of finished product. The method is a novel technology for carrying out spheroidising by throwing a spheroidising agent in a furnace.
Description
Technical field
The present invention relates to a kind of method for cast-iron spheroidazation is and in particular to a kind of spheroidising side of ductile Ni-resist cast iron
Method, belongs to Foundry Production technical field.
Background technology
Ductile Ni-resist cast iron, refers to a class alloy nodular cast iron in the range of 13 ~ 38% for its nickel content.Generally it
In chemical composition, carbon content≤4.0%, nickel content is 13 ~ 38%, and residual content of magnesium is 0.03 ~ 0.09%（Weight percentage）；Its
Metallographic structure is austenite and partially carbonized thing and globular graphite it is also possible to there is pearlite and ferrite.Because it is not only normal
Warm high mechanical properties, have fabulous thermal-shock resistance and heat creep resistance, fabulous high-temperature oxidation resistance and corrosion resistance, and
And have low thermal expansivity and good low-temperature impact toughness, thus have broad application prospects in manufacturing industry, volume size
The high-Ni-Cr cast iron Demand of castings not waited is to grow with each passing day.
The spheroidizing process of spheroidal graphite cast-iron, is to throw in nodulizer from into molten iron, then through throwing in inovulant until pouring into a mould
Technical process.In this technical process, the spheroidizing reacion of cast iron is persistently to carry out coming out of the stove, in calm, cast overall process
's.The different spheroidizing process of spheroidal graphite cast-iron all can bring great impact to the quality of final casting and performance etc..
However, the nodulizing process of current ductile Ni-resist cast iron, adopted is still succession nodulizer casting ladle remote
Pour method, casting ladle plunging and casting ladle Feed aluminum wire etc., such as：The Publication No. that Yancheng Fine Casting Industry Co., Ltd. submits to
" high nickel austenite ductile iron spheroidizing process " application for a patent for invention of CN102168219A, and Ningxia Great Wall must rugged casting
A kind of " spheriodization process thereof of Produce Heavy Nodular lron part " of Publication No. 102433490A that Co., Ltd submits to.These balls existing
Change processing method, there is many deficiencies in practice：
One is that to pour pack arrangement relatively complicated.Generally specific placement nodulizer and inovulant to be set in casting ladle bottom
Pit, dykes and dams and balance pit.
Two is the nodularization element magnesium due to being placed on nodulizer in the pit of casting ladle bottom setting（Including block, silk etc.）With
Insufficient contact between molten iron, so that its spheroidizing reacion is insufficient, nodularization lack of homogeneity, difficult to reach expected nodularization effect after tapping a blast furnace
Really directly affect the stability of the spheroidizing quality of described iron casting.
Three is that execute-in-place environment is poor, and security is low.Due to disposing nodulizer and inovulant in the pit to casting ladle it is necessary to
Bake red roasting saturating in casting ladle（850 DEG C of temperature ＞）Under conditions of carry out, and the height of casting ladle is higher（The ratio of height to diameter of casting ladle typically will >=
1.5）, workman will emit extremely hot after getting close to casting ladle, nodulizer, inovulant and coverture could be layered fixed point successively and be arranged in and pour
In the pit of bag, and also to add that sealing implemented by steel plate on its surface, thus whole operation process, it is hard on very much and hardships, and
And have larger security risk.
Four due to pouring method, plunging and Feed aluminum wire described in prior art, will be equipped with necessary device, thus also increase
Equipment investment and maintaining cost are added.
Five is due to spheroidising and inoculation, is all to implement in the outer pouring ladle of smelting furnace, thus its molten iron temperature
Reduce more.In order to reach technological temperature, prior art must improve smelting temperature, and this just increases energy consumption.
Based on the described nodulizing process of prior art, existing work on the spot environment is poor, process costs high, safety
Property all many deficiencies such as low and casting quality is unstable, and research and develop a kind of new nodulizing process, to overcome existing skill
The deficiency of art, it has also become expectation in the industry.
Content of the invention
The present invention is intended to provide a kind of process costs are low, easy to operate, safe, good work environment, casting quality are steady
The nodulizing process of fixed ductile Ni-resist cast iron, to overcome the shortcomings of prior art.The present invention realizes the technology structure of its purpose
Think it is to take the method implementing spheroidising in smelting furnace, the method to substitute spheroidising in casting ladle；Meanwhile, change
Enter the structure of casting ladle, its ratio of height to diameter is narrowed down to less than 1.2 by the 1.5 of prior art.Thus overcome the shortcomings of prior art, real
The existing purpose of the present invention.
Based on above-mentioned technical though, the technical scheme that the present invention realizes its purpose is：
A kind of nodulizing process of ductile Ni-resist cast iron, its processing step includes, and furnace charge melting, spheroidising are bred
Process and pour into a mould, and the smelting furnace that described furnace charge melting is adopted is intermediate frequency furnace, its innovative point is,
A, described spheroidising, are to add in molten molten iron in intermediate frequency sense stove by nodulizer, using intermediate frequency furnace
The agitating function to molten iron having, implements uniform spheroidising to molten iron in stove；
B, described inoculation, are by the molten iron through spheroidising in intermediate frequency furnace, and pouring bottom into, to there is technique amount pregnant
Educate in the casting ladle of agent, implement inoculation.
By technical scheme given above it is understood that the present invention is that nodulizer adds before described smelting furnace taps a blast furnace stove
In interior molten iron, the agitating function that had using intermediate frequency furnace, make nodulizer sufficiently be stirred with molten iron in stove and
, there is sufficient spheroidizing reacion, so both met the condition of spheroidizing reacion, and so that the uniformity of spheroidizing reacion has been obtained bright in mixing
Aobvious improvement, the spheroidizing quality of foundry goods becomes more stable.And this process implementing can also significantly reduce the temperature of subsequent operation
Degree loss.Trace it to its cause be spheroidizing reacion this as temperature-fall period, nodularization in stove can not only compensate what spheroidizing reacion brought
Temperature loss, can also reduce process time in casting ladle for the molten iron simultaneously, make the loss of molten iron temperature relatively less.Thus overcoming
The deficiency of prior art is it is achieved that the original intention of the present invention.
Due to present invention employs in the molten iron before smelting furnace taps a blast furnace, nodulizer being added to melting in advance, one can also be entered
Walk for follow-up breed, pouring operation also brings many benefits, be embodied in：
One is that inovulant can put into casting ladle bottom any part it is not necessary to be placed into regulation in the way of very random
Put into position.More convenient to operate and security is good.
Two is the structure that casting ladle can be slightly larger than 1 from ratio of height to diameter, facilitates operating personnel to place inovulant near casting ladle
Bottom to casting ladle；
Three is can be further simplify the structure of casting ladle, subtracted from the casting ladle without pit, dykes and dams and balance pit structure
Process costs are lacked.
Four is that molten iron is poured bottom into and existed in the casting ladle of inovulant, because the proportion of inovulant is little compared with the proportion of molten iron, with
Molten iron in casting ladle to be continuously increased, inovulant constantly floats, melts, increase being fully contacted between inovulant and molten iron, obtain
Optimal pregnant effect；And decrease process time in casting ladle for the molten iron, thus molten iron temperature loss is relatively fewer.From
And further overcome the deficiency of prior art it is achieved that the original intention of the present invention.
In technique scheme, the present invention also advocates, the inoculation to weight >=500kg foundry goods molten iron, is in leakage
Implement in bottom pour ladle.Comparatively weight of molten iron described in the program is, if being necessary the foundry goods molten iron of ＜ 500kg,
Inoculation can be implemented using bottom drain casting ladle.The purpose of this technical scheme, essentially consists in and foreign impurity can be greatly decreased
Enter the risk of ductile Ni-resist cast iron part, be conducive to the further slag removal and purification of molten iron, the cast of more convenient heavy castings, thus
Improve the quality of foundry goods further.
In technique scheme, the present invention also advocates, the ratio of height to diameter of described casting ladle is in the range of 1 ~ 1.2.But do not limit to
In this.And reduce the technical scheme of casting ladle height, it is in order at after spheroidising carries out in stove, molten iron in casting ladle, will not be occurred to fly
Splash, and can ensure that what site safety was considered.Due to reducing casting ladle height, can substantially facilitate building by laying bricks or stones of casting ladle, baking and
The operation such as slagging-off and cast.
In technique scheme, the present invention also advocates, also includes late inoculation and processes, described late inoculation is processed, and is
Lay inovulant in the molten iron runner system of foundry goods sand mo(u)ld and implement.This technical scheme is based on described spheroidising
Journey, from into molten iron throw in nodulizer, then through throw in inovulant, until pouring molten iron entrance die cavity in till consideration and
Put forward.Thus described late inoculation is processed, inovulant can be sprayed in foundry goods sand mo(u)ld runner system, or in its runner system
Middle laying subparticle shape inovulant and implement.Certainly, implementing when late inoculation is processed it should consider that molten iron should have relatively
For suitable pouring technology temperature.
Under technique scheme commander, a kind of technical scheme of specific implementation step that the present invention is advocated is：
Step（a）, casting ladle preparation；Described casting ladle is casting ladle in the range of 1～1.2 for the ratio of height to diameter, described casting ladle is baked red
Roasting saturating；In 0.5～1.5min before described smelting furnace taps a blast furnace, technique amount inovulant is put into bag bottom, standby；
Step（b）, furnace charge that will be joined according to described ductile Ni-resist cast iron chemical composition, put into molten in intermediate frequency furnace
Refining；When smelting gained molten iron reaches technological temperature, implement thermal insulation deslagging and process；
Step（c）, after in smelting furnace, molten iron temperature reaches spheroidizing process temperature, technique amount nodulizer is added in stove, and
Keep 1～1.5min, be then carried out collecting slag except Slag treatment；
Step（d）, after the collection slag of step c terminates except Slag treatment, molten iron in smelting furnace is quickly poured in casting ladle；Pour into
Molten iron in casting ladle, in the presence of the inovulant being present in bag bottom, implements inoculation；
Step（e）, after the molten iron through step d inoculation in casting ladle is implemented with stirring and calm 1～1.5min, implement
Slag treatment is removed in casting ladle；When molten iron temperature reaches pouring technology temperature in casting ladle, implement follow-up pouring technology.
In the technical scheme of above-mentioned specific implementation step, the present invention also advocates, implements weight >=500kg foundry goods molten iron pregnant
Educate the casting ladle of process, be bottom drain casting ladle, and its ratio of height to diameter is in the range of 1～1.2.
In the technical scheme of above-mentioned specific implementation step, the present invention also advocates, also includes late inoculation and processes.Specifically interior
Hold the relevant portion that can be found in above.
In technique scheme and specific implementation step technical scheme, the present invention also advocates, described nodulizer is nickel magnesium
Alloy, or Si-Mg alloy, or magnesium-rare earth.But it is not limited to this.Other is containing q.s nodularization element magnesium
Alloy is it is also possible to nodulizer as the present invention.But in view of the proportion of nickel magnesium alloy is suitable, spheroidizing reacion steadily, and puts into practice card
Its nodularization effect bright is good, gives preferably for this present invention.According to the characteristic of ductile Ni-resist cast iron, using magnesium-rare earth, pure magnesium
Also identical nodularization effect can be reached Deng nodulizer.Spheroidizing process used such as nodularization temperature, pouring temperature etc. can be according to differences
The technological requirement of product determines.
In technique scheme and specific implementation step technical scheme, the present invention also advocates, described inovulant is silicon
Ferroalloy, or Si-Ba-Ca alloy.But it is not limited to this.Other alloys containing q.s inoculant elements silicon are it is also possible to make
Inovulant for the present invention.But the preparation cost based on Antaciron is low, pregnant effect is good, and the present invention gives preferably.
In technique scheme and specific implementation step technical scheme, the present invention also advocates, described ductile Ni-resist cast iron
Chemical composition include：Carbon content≤4.0%, nickel content is 13 ~ 38%, and residual content of magnesium is 0.03 ~ 0.09%.And described casting ladle is
Inner bottom surface is in flat casting ladle.
After technique scheme is implemented in full, the process that the present invention has is reasonable, easy and simple to handle, building ring
Border safety, foundry goods spheroidizing quality is good and the features such as stablizing, be it will be apparent that being a kind of nodularization of brand-new ductile Ni-resist cast iron
Processing method.Meanwhile, it is also applied for the spheroidising of the higher spheroidal graphite cast-iron of other nickel contents.And the spheroidising of the present invention
Method is applicable not only to the high-Ni-Cr cast iron product of the difference sand molding such as precoated sand or resin sand, is also applied for green sand molding work
The high-Ni-Cr cast iron product of skill cast.
Brief description
Fig. 1 is the Oxygen potential photo of the ductile Ni-resist cast iron material object body foundry goods that spheronization process of the present invention is produced（Wall thickness
At 25mm, amplify 100 times）；
Fig. 2 is the metallographic structure photo of the ductile Ni-resist cast iron material object body foundry goods that spheronization process of the present invention is produced（Wall thickness
At 25mm, amplify 100 times）；
Fig. 3 is the Oxygen potential photo of the ductile Ni-resist cast iron material object body foundry goods that spheronization process of the present invention is produced（Wall thickness 6.
At 5 mm, amplify 100 times）；
Fig. 4 is the metallographic structure photo of the ductile Ni-resist cast iron material object body foundry goods that spheronization process of the present invention is produced（Wall thickness
6., at 5 mm, amplify 100 times）；
Fig. 5 is the Oxygen potential photo of the ductile Ni-resist cast iron material object body foundry goods that spheronization process of the present invention is produced（Wall thickness 5.
At 2 mm, amplify 100 times）；
Fig. 6 is the metallographic structure photo of the ductile Ni-resist cast iron material object body foundry goods that spheronization process of the present invention is produced（Wall thickness
5., at 2 mm, amplify 100 times）；
Fig. 7 is the Oxygen potential photo that the resin sand that spheronization process of the present invention is produced pours into a mould coupon（At wall thickness 25 mm, amplify
100 times）；
Fig. 8 is the metallographic structure photo that the resin sand that spheronization process of the present invention is produced pours into a mould coupon（At wall thickness 25 mm, put
Big 100 times）；
Fig. 9 is the Oxygen potential photo that the precoated sand that spheronization process of the present invention is produced pours into a mould coupon（At wall thickness 12 mm, amplify
100 times）；
Figure 10 is the metallographic structure photo that the precoated sand that spheronization process of the present invention is produced pours into a mould coupon（At wall thickness 12 mm, put
Big 100 times）.
Specific embodiment
Using the technical scheme of specific implementation step of the present invention, it is embodied as in laboratory.The inventive method
Employed in various raw material or the detail specifications of reagent or consumption etc. be used for the purpose of example, do not constitute to skill of the present invention
The restriction of art scheme.
Test selects a high-nickel austenite nodular cast iron product, and its technical requirements is as follows：
Chemical composition：C≤2%, Ni 34 ~ 38%, residual Mg0.03 ~ 0.09% and related other alloying elements.
Mechanical property：Tensile strength >=345Mpa, elongation percentage >=12%.
Metallographic structure：I, II grade of nodulizing grade, sphere diameter >=5 grade, matrix adds partially carbonized thing for austenitic matrix.
Tested using 50kg intermediate frequency furnace, raw material adopts the pig iron, carburant, nickel plate and other associated alloys, ball
Agent adopts nickel magnesium alloy（Mg content is 8 ~ 13%, Ni content is 28 ~ 38%, and remaining is iron and inevitable impurity）, add
Measure as 0.95% (technological requirement:0.9-1.5%)；Inovulant adopts Antaciron（Si content is 75%, and remaining is iron and can not
The impurity avoiding）, addition is 1.0 % (technological requirements:0.9-1.2%).The specific implementation step of the present invention includes：
Step（a）, casting ladle preparation；Described casting ladle is casting ladle in the range of 1～1.2 for the ratio of height to diameter, described casting ladle is baked red
Roasting saturating；In 0.5～1.5min before described smelting furnace taps a blast furnace, technique amount inovulant is put into bag bottom, standby；
Step（b）, furnace charge that will be joined according to described high-nickel austenite nodular cast iron chemical composition, put into intermediate frequency furnace
Interior melting；When smelting gained molten iron reaches technological temperature, implement thermal insulation deslagging and process；
Step（c）, after in smelting furnace, molten iron temperature reaches spheroidizing process temperature, technique amount nodulizer is added in stove, and
Keep 1～1.5min, be then carried out collecting slag except Slag treatment；
Step（d）, after the collection slag of step c terminates except Slag treatment, molten iron in smelting furnace is quickly poured in casting ladle；Pour into
Molten iron in casting ladle, in the presence of the inovulant being present in bag bottom, implements inoculation；
Step（e）, after the molten iron through step d inoculation in casting ladle is implemented with stirring and calm 1～1.5min, implement
Slag treatment is removed in casting ladle；When molten iron temperature reaches pouring technology temperature in casting ladle, implement follow-up pouring technology.In institute of the present invention
Step a stating specific implementation step）To step e）Technical scheme in, smelting temperature be 1600 DEG C, nodularization and temperature of tapping a blast furnace in stove
Spend for 1580 DEG C, pouring temperature is 1500 DEG C. inoculation and cast are carried out using casting ladle, has poured into a mould the nickelic ball of 2 precoated sands
Black ironcasting volute is in kind to pour into a mould coupon 1 with 2 pieces of resin sand Y type test blocks and precoated sand.
Described casting ladle, can be from ladle or teapot bag it is also possible to select nodularization bag；
For reducing manufacture, process costs further, described casting ladle can also be using the casting ladle saving spheroidizing reacion function；I.e.
The bottom of casting ladle can not set the pit of accommodating nodulizer.Preferably, described casting ladle has flatter or smooth inner bottom surface；As interior
Bottom surface is in flat ladle or teapot bag.
Chemical composition using the described high-nickel austenite spheroidal graphite casting obtained by the present invention is taken from Y type test block, presses
GB223 iron and steel and alloy composition analysis method are detected；The mechanics of obtained described high-nickel austenite spheroidal graphite casting
Performance is taken from precoated sand cast coupon and resin sand cast coupon；By GB228.1 metal material stretching test part 1:
Room temperature test method is detected.ASTM A 247- is pressed in the metallographic structure of obtained described high-nickel austenite spheroidal graphite casting
In 2006 evaluation iron castings, the test method of graphite microstructure is evaluated.
The obtained chemical composition of high-nickel austenite spheroidal graphite casting, the testing result of mechanical property are as shown in table 1：
Table 1 foundry goods chemical composition and mechanical property
To body foundry goods in kind, metallographic group has been made in sampling at the different wall of 5.2mm, 6.5mm, 25mm to the present invention respectively
The detection knitted and evaluation, pour into a mould to resin sand each to sample at coupon wall thickness 25mm and precoated sand cast coupon wall thickness 12mm and make
The detection of metallographic structure and evaluation, testing result is as shown in table 2：
Table 2 foundry goods metallographic structure
Although from accompanying drawing and table 2 as can be seen that wall thickness is different, all meeting I, II grade of the nodulizing grade that product specifies, ball
Footpath >=5 grade, matrix is the technical requirements that austenitic matrix adds partially carbonized thing.
Note：80% I 7+10%, I 6+10% II 7 represent the meaning be：In the tissue of described foundry goods or coupon sampling point, ball
Change that grade is I grade and sphere diameter reaches 7 grades of graphite nodule and accounts for that 80%, nodulizing grade is I level and sphere diameter reaches 6 grades of graphite nodule and accounts for
10%th, nodulizing grade is II grade and sphere diameter reaches 7 grades of graphite nodule and accounts for 10%.Above-described percentage is area percentage.
Above experimental products testing result shows, nodulizing process of the present invention is rationally reliable, obtained
The quality of high-nickel austenite spheroidal graphite casting complies fully with technical requirements.And its environment peace shown by spheroidizing process process
Entirely, manipulation strength is low, and molten iron temperature loss is few, and process costs are low, the features such as energy-conserving and environment-protective, is also fairly obvious.
The present disclosure applies equally to the spheroidising of other nickeliferous higher alloy nodular cast irons.
Claims (1)
1. a kind of nodulizing process of ductile Ni-resist cast iron, its processing step includes：Furnace charge melting, spheroidising, womb
Reason and pouring into a mould, and the smelting furnace that adopted of described furnace charge melting be intermediate frequency furnace it is characterised in that
A, described spheroidising, are to add in intermediate frequency furnace by nodulizer, using the agitating function to molten iron for the intermediate frequency furnace,
Spheroidising is implemented to molten iron in stove, described nodulizer is nickel magnesium alloy；
B, described inoculation, are by the molten iron after spheroidising in intermediate frequency furnace, pour bottom into and there is technique amount and breed
In the casting ladle of agent, implement inoculation；
C, the chemical composition of described ductile Ni-resist cast iron include：C≤2%, Ni 34～38%, residual Mg0.03～0.09%；
D, the specific implementation step of the method are：
Step（a）, casting ladle preparation；Described casting ladle is casting ladle in the range of 1～1.2 for the ratio of height to diameter, described casting ladle is baked red roasting saturating；
In 0.5～1.5min before described smelting furnace taps a blast furnace, inovulant in bulk for technique amount is put into bag bottom, standby；
Step（b）, furnace charge that will be joined according to described ductile Ni-resist cast iron chemical composition, put into melting in intermediate frequency furnace；When
When smelting gained molten iron reaches technological temperature, implement thermal insulation deslagging and process；
Step（c）, after molten iron temperature reaches spheroidizing process temperature in smelting furnace, technique amount nodulizer is added in stove, and keeps 1
～1.5min, is then carried out collecting slag except Slag treatment；
Step（d）, after the collection slag of step c terminates except Slag treatment, molten iron in smelting furnace is quickly poured in described casting ladle；Pour into
Molten iron in casting ladle, in the presence of the inovulant being present in bag bottom, implements inoculation；
Step（e）, after the molten iron through step d inoculation in casting ladle is implemented with stirring and calm 1～1.5min, implement casting ladle
Interior except Slag treatment；When molten iron temperature reaches pouring technology temperature in casting ladle, implement follow-up pouring technology；
The casting ladle that e, enforcement weight >=500kg foundry goods molten steel preparation are processed is bottom drain casting ladle, and its ratio of height to diameter is in 1～1.2 scope
Interior；
F, described inovulant are Antacirons, or Si-Ba-Ca alloy；
G, also include late inoculation and process, described late inoculation is processed, be to lay and breed in the molten iron runner system of foundry goods sand mo(u)ld
Agent and implement；
H, described casting ladle are in flat ladle for inner bottom surface.
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| ES2608934B2 (en) * | 2017-02-01 | 2017-08-16 | Fundinorte, S.L. | PROCEDURE FOR OBTAINING NODULAR FOUNDATION |
| CN110560656A (en) * | 2019-10-23 | 2019-12-13 | 湖北正信管件有限公司 | Nodular cast iron pipe fitting production facility |
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| CN101333618B (en) * | 2008-07-16 | 2010-04-21 | 上海大学 | Long-acting synthesizing process of heavy sectioned ductile iron |
| CN101403068A (en) * | 2008-11-06 | 2009-04-08 | 徐宏亮 | Austenite spheroidal iron and producing method thereof |
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