CN109594007A - A kind of myrmekite ink cast iron and its preparation process and application - Google Patents
A kind of myrmekite ink cast iron and its preparation process and application Download PDFInfo
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- CN109594007A CN109594007A CN201811479221.6A CN201811479221A CN109594007A CN 109594007 A CN109594007 A CN 109594007A CN 201811479221 A CN201811479221 A CN 201811479221A CN 109594007 A CN109594007 A CN 109594007A
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- cast iron
- treatment agent
- myrmekite
- ink cast
- myrmekite ink
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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
-
- 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
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/02—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- General Engineering & Computer Science (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention discloses a kind of myrmekite ink cast iron and preparation process and applications, by percentage to the quality, contain: C:3.6% ~ 4.0%, Si:1.6% ~ 2.0%, Mn:0.4% ~ 0.8%, P:0% ~ 0.25%, S:0.01% ~ 0.04%, Cu:0.20% ~ 0.6%, Sn:0.04% ~ 0.08%, Cr:0.10% ~ 0.3%, surplus are Fe and with impurity, 0.30% ~ 0.40% Metamorphism treatment agent is used to control the nodulizing rate of graphite form as 20% ~ 60% in production process, the mechanical property of materials is greatly improved, tensile strength >=450N/mm2, yield strength >=315N/mm2, elongation percentage≤3%, hardness range be HB200 ~ 250, endurance life test up to 2600 hours, can be applied to the compressor core part scroll plate of high mechanical strength demand.
Description
Technical field
The present invention relates to a kind of graphite cast irons, and in particular to a kind of myrmekite ink cast iron and its preparation process and application；Belong to
In graphite cast iron technical field.
Background technique
The forming process of Graphite in Cast Iron is known as graphitizing process, and the basic process that structure of cast iron is formed is exactly stone in cast iron
The forming process of ink.The graphite type and size of gray cast iron depend on graphite branch and growth rate in eutectic cell, work as eutectic cell
It stops growing, growing up for graphite also just stops.Because gray cast iron has good casting character, damping property, wear-resisting property, cutting
Processing performance and low notch sensitivity obtain relatively broad application in casting technology field.
According to the form of graphite, gray cast iron can be divided into: common grey iron, spheroidal graphite cast-iron, malleable cast iron and compacted ink casting
Iron, in the form of sheets, when metallographic observation, graphite is dispersed on matrix the graphite of common grey iron with individual sheet, they are to separate
, compartment, as shown in Figure 1；In spherical, the graphite in malleable cast iron is agglomerating cotton-shaped, and compacted for graphite in spheroidal graphite cast-iron
Black Graphite in Cast Iron is in vermiform, also known as myrmekite ink cast iron.
The mechanical property of gray cast iron is related to the morphology of the tissue of matrix and graphite, the flake graphite pair in gray cast iron
Isolating for matrix is serious, easily causes stress to concentrate in graphite sharp corner, is far below the tensile strength, plasticity and toughness of gray cast iron
Steel, but compression strength is suitable with steel, it is widely used in the fields such as compressor scroll plate.Currently on the market for market handle official business with
And the air-conditioning, food fresh keeping in mass transportation refrigeration and cold chain transportation refrigeration mode compressor core part whirlpool
Capstan all uses grey cast-iron as preferred material.In recent years, under the requirement of national environmental protection policy, in order to reduce winter fire coal
Pollution improves air quality, and the mode of heat supply in winter is changed to Electric energy type heating by traditional coal heating.In this context,
Heat-pump-type compressor for heat supply in winter starts to flourish in recent years.The operating temperature of refrigeration mode compressor is -10 DEG C~60
DEG C operation interval；Heat-pump-type compressor is because be mainly used for the heating heating of north of china in winter, and operating temperature is at -30 DEG C~90 DEG C
Operation interval；The operational difference being resistant to needed for heat-pump-type compressor core part scroll plate is up to 120 DEG C, but uses in the market
There was only 70 DEG C in the tolerable operational difference of the scroll plate of refrigeration mode compressor.In the working environment of high temperature difference bad working environments
In, the scroll plate of common grey iron production can have the risk of fracture because of mechanical strength deficiency.
Need are applied in order to meet the components such as heat-pump-type compressor core part scroll plate in high temperature difference working environment
It wants, it is necessary to develop a kind of new cast iron materials.
Summary of the invention
To solve the deficiencies in the prior art, one of the objects of the present invention is to provide a kind of myrmekite ink cast iron, another mesh
Be the preparation process of the myrmekite ink cast iron is provided, a further object is to provide the application of the myrmekite ink cast iron.
In order to achieve the above objectives, the present invention adopts the following technical scheme that:
A kind of myrmekite ink cast iron contains by percentage to the quality: C:3.6%~4.0%, Si:1.6%~2.0%,
Mn:0.4%~0.8%, P:0%~0.25%, S:0.01%~0.04%, Cu:0.20%~0.6%, Sn:0.04%~
0.08%, Cr:0.10%~0.3%, surplus are Fe and with impurity, in production process using account for molten iron gross mass 0.30%~
The nodulizing rate of 0.40% Metamorphism treatment agent control graphite form is 20%~60%.
C (carbon) is the element as graphite structure, and content has vital volume to influence the elongation percentage of material, C
Too high levels are also easy to produce ferrite, and therefore, in the present invention, the content of C is C:3.6%~4.0%, carbon equivalent C.E. value control
System is between 4.3~4.8.
Si is that the element of graphite crystallization is promoted to be unfavorable for the form stable of myrmekite ink cast iron if Si content is inadequate,
If Si content is too many, graphite shape becomes larger, and the ferrite content in the Al-Qaeda terrorist organization will increase, and is unfavorable for myrmekite ink cast iron
The promotion of mechanical performance, therefore, Si content are 1.6%~2.0%.
The effect of Mn is that the structure of stabilizing pearlite, preferred range are 0.4%~0.8%, avoids that Quench trend occurs.
The content of P is not to be exceeded 0.25%, otherwise can make that iron phosphide is precipitated in the Al-Qaeda terrorist organization, and iron phosphide is a kind of hard object
Matter leads to the product premature abrasion being used cooperatively with cast iron products.
The present invention is to obtain a kind of myrmekite ink cast iron, and nodulizing rate reaches 20%~60%, and therefore, the addition of S is not
It can or lack, S can prevent spheroidization of graphite, and still, if the content of S is more than 0.04%, then graphite slabbing, can not obtain steady
Fixed myrmekite ink cast iron, therefore, preferred range are 0.01%~0.04%.Meanwhile the content of S is also affected as rotten
The additional amount of the alloy auxiliary material of inorganic agent, at 0.01%~0.02%, the amount of the Metamorphism treatment agent of addition goes out S content for molten iron
For 0.3%, the S content of soup weight at 0.021%~0.040%, the amount of the Metamorphism treatment agent of addition is then that molten iron goes out soup molten iron
The 0.35% of weight.
Cu is the stabilizing element of pearlitic structrure, also has an impact for mechanical performances such as elongation percentage, tensile strength, contains
Amount is 0.20%~0.6%.
The content of Sn is 0.04%~0.08%, can mitigate the segregation of graphite, and can prevent caused by internal oxidation
The oxidation of graphite fall off.
The content of Cr is 0.10%~0.3%, makes Carbide Precipitation in conjunction with carbon in cast iron base material, passes through the analysis of substrate
Strengthening out optimizes the mechanical performance of cast iron.
Preferably, in aforementioned Metamorphism treatment agent, by percentage to the quality, contain: Mg:5.0%~6.0%, Al:0%~
1.0%, Si:40%~50%, Ca:1.5%~2.5%, RE:5.5%~6.5%, surplus Fe, wherein RE represents group of the lanthanides
The summation of rare earth element.
It is highly preferred that the quality sum of Mg and Ce account for the quality hundred of entire myrmekite ink cast iron in aforementioned Metamorphism treatment agent
Divide than being 0.02%~0.04%, wherein Ce is one of RE element.Mg is the important element of graphite compactedization, and Ce is in iron
Have very strong deaeration capability (such as: oxygen, nitrogen, hydrogen) and desulfidation in water, can reduce compactedization is acted on it is unfavorable above-mentioned
Element makes them be changed into Ce2O2Obtain effectively removing compactedization for avoiding influencing Mg effect after the dross of S etc.
It is highly preferred that myrmekite ink cast iron of the invention, tensile strength >=450N/mm2, yield strength >=315N/mm2、
Elongation percentage≤3%, hardness range are HB200~HB250, and mechanical performance has obtained very big optimization compared to traditional grey cast-iron.
More preferably, the Al-Qaeda terrorist organization of the myrmekite ink cast iron is pearlite and ferritic line and staff control, wherein pearly-lustre
Mass percentage >=90% of the body in the Al-Qaeda terrorist organization.
A kind of foregoing preparation process of myrmekite ink cast iron is also disclosed in the present invention, includes the following steps:
S1, melt: main material, leftover pieces and foundry returns are put into intermediate frequency furnace and are warming up to 1380~1450 DEG C of meltings, is made
It is fused into molten iron, is detected with phosphorus content of the carbon silicon instrument to molten iron, then with sub-ray spectrometer detection Si%, Mn%, P%,
The content of S%, Cu%, Sn%, Cr%, power-off carries out slagging-off operation for the first time and is added alloying ingredient after analysis, through at
Second of slagging-off operation is carried out after being analyzed to identify；
S2, creepage rate: Metamorphism treatment agent being added into ladle, and the Metamorphism treatment agent is the conjunction of lanthanide rare magnesium ferrosilicon
Gold, mass percentage of each element in Metamorphism treatment agent are respectively as follows: Mg:5.0%~6.0%, Al:0%~1.0%, Si:
40%~50%, Ca:1.5%~2.5%, RE:5.5%~6.5%, surplus Fe, RE represent the summation of lanthanide series rare-earth elements,
The creepage rate time is 20~50s；
S3, go out soup: ladle being transferred to stokehold and carries out out soup operation, controls out soup temperature, the molten iron of ladle is fallen
Enter to cast in basin, the Inoculant that 0.2% is added when subcontracting carries out molten steel preparation to complete to subcontract movement；
Molten iron sampling is carried out before S4, casting, ingredient is analyzed, and i.e. casting obtains the casting of myrmekite ink if ingredient is qualified
Iron.
Preferably, the mass ratio of aforementioned main material, leftover pieces and foundry returns three is 10%:30%:60%, the conjunction
Comprising one of Si, Mn, P, S, Cu, Sn and Cr or a variety of in golden ingredient, by adding alloying ingredient for the ingredient tune of cast iron
It is whole to target value.
More preferably, aforementioned soup temperature out remains 1450~1600 DEG C, and Inoculant is silicon barium-ferrum alloy.
It is highly preferred that the additional amount of Metamorphism treatment agent and S% are closely related, specifically, S% content is 0.01%~
When 0.02%, the additional amount of Metamorphism treatment agent is that molten iron goes out the 0.3% of soup weight；When S% content is 0.021%~0.04%,
The additional amount of Metamorphism treatment agent is that molten iron goes out the 0.35% of soup weight of molten iron.
A kind of foregoing myrmekite ink cast iron can be used in manufacturing the scroll plate of heat-pump-type screw compressor.
Technical solution of the present invention has the advantage that
(1) control of carbon equivalent C.E. value can be guaranteed into carbon equivalent of the molten iron in process of setting between 4.3~4.8
Close to eutectic composition, to achieve the purpose that refine graphite size (graphite is avoided to explode) and avoid internal porosity；
(2) mass percent that Mn, Cu and Cr are rationally controlled in the present invention, guarantees the pearlite in entire the Al-Qaeda terrorist organization
Content is 90% or more, while the problem of excessive high hardness caused by turn avoiding because of Mn, Cu, Cr too high levels；
(3) by addition Cr element, vermicular cast iron material material (the commercially available compacted ink of low elongation (≤3%) is produced
3%) the usual elongation percentage of cast iron quality material is not less than, and the additive amount that the present invention is controlled is in the base for guaranteeing low extension demand
The increase problem of material hardness is in turn avoided on plinth；
(4) it carries out controlling the control realized for nodulizing rate by the content of Mg, Ce, so that myrmekite ink of the invention
The nodulizing rate of Graphite Morphology in Cast Iron is 20%~60%, compared to regular gray iron in the market, the machine of myrmekite ink cast iron
Tool performance is greatly improved, tensile strength >=450N/mm2, yield strength >=315N/mm2, elongation percentage≤3%, hardness model
It encloses for HB200~HB250, endurance life test up to 2600 hours, can be applied to the compressor core of high mechanical strength demand
The manufacture of heart part scroll plate.
Detailed description of the invention
Fig. 1 is the metallographic microscope of common grey iron in the prior art；
Fig. 2 is a kind of metallographic microscope of myrmekite ink cast iron of the invention.
Specific embodiment
Specific introduce is made to the present invention below in conjunction with the drawings and specific embodiments.
Examples 1 to 6 is each elemental composition for test material of the invention.
1 Examples 1 to 6 chemical composition of table
The chemical composition of 2 Examples 1 to 6 mesometamorphism inorganic agent of table
The graphite cast iron for having chemical composition (quality %) shown in table 1 is cast as bulk for test material, so as to progressive
It can detect, casting technique includes the following steps:
S1, melt: main material, leftover pieces and foundry returns are put into intermediate frequency furnace and are warming up to 1380~1450 DEG C of meltings, is made
It is fused into molten iron, is detected with phosphorus content of the carbon silicon instrument to molten iron, then with sub-ray spectrometer detection Si%, Mn%, P%,
The content of S%, Cu%, Sn%, Cr%, power-off carries out slagging-off operation for the first time and is added alloying ingredient after analysis, through at
Second of slagging-off operation, chemical Composition Control target are carried out after being analyzed to identify are as follows: C:3.6%~4.0%, Si:1.6%~
2.0%, Mn:0.4%~0.8%, P:0%~0.25%, S:0.01%~0.04%, Cu:0.20%~0.6%, Sn:
0.04%~0.08%, Cr:0.10%~0.3%；
S2, creepage rate: the Metamorphism treatment agent conduct for accounting for molten iron gross mass 0.30%~0.40% is added into ladle
Vermiculizer, the Metamorphism treatment agent are lanthanide rare magnesium Antaciron, mass percentage of each element in Metamorphism treatment agent point
Not are as follows: Mg:5.0%~6.0%, Al:0%~1.0%, Si:40%~50%, Ca:1.5%~2.5%, RE:5.5%~
6.5%, surplus Fe, RE represent the summation of lanthanide series rare-earth elements, and the creepage rate time is 20~50s；
S3, go out soup: ladle being transferred to stokehold and carries out out soup operation, controls out soup temperature, the molten iron of ladle is fallen
Enter to cast in basin, the Inoculant that 0.2% is added when subcontracting carries out molten steel preparation to complete to subcontract movement；
Molten iron sampling is carried out before S4, casting, is write using spectrophotometric spectra and ingredient is analyzed again, target component content is same
On, are as follows: C:3.6%~4.0%, Si:1.6%~2.0%, Mn:0.4%~0.8%, P:0%~0.25%, S:0.01%~
0.04%, Cu:0.20%~0.6%, Sn:0.04%~0.08%, Cr:0.10%~0.3%, surplus are Fe and with miscellaneous
Matter；Direct pouring obtains myrmekite ink cast iron if qualification, unqualified, directly melts down processing.
In step sl, strict control and detection carried out to ingredient, in step S4, ingredient reaffirmed,
It is in order to avoid the processes such as compactedization have an impact ingredient.Because the additional amount of vermiculizer accounts for the ratio (0.30% of molten iron gross mass
~0.40%) very little, so, it can't generally make chemical component that apparent variation occur.
Following performance detection is carried out for test material to each:
(1) it structure: is detected using metallographic microscope, brand: OLYMPUS, model: BX41M；
(2) pull test machine testing, brand: Japanese Shimadzu, model: AG-X-PLUS mechanical performance: are used；
(3) cloth hardness machine testing, brand: modern well essence machine, model BRINELL-BO3 hardness: are used.
Performance test results are shown in Table 3:
The performance test results of 3 embodiment 1-6 of table
The structure figure of myrmekite ink cast iron of the invention as shown in Fig. 2, compared to Fig. 1 grey cast-iron structure
For, significant change has occurred in the graphite form of cast iron of the invention, is collectively constituted by quasiflake graphite and globular graphite, compacted
Rate (i.e. ratio shared by quasiflake graphite) is 20%~60%.Compared to regular gray iron in the market, the myrmekite
The mechanical performance of black cast iron is greatly improved, tensile strength >=450N/mm2, it is the 1.6 of grey cast-iron material on the market
Times, yield strength >=315N/mm2, elongation percentage≤2%, hardness range be HB200~HB250, endurance life test up to 2600
Hour (grey cast-iron endurance life in the market is no more than 2000 hours), service life promotion 30%, thus, myrmekite ink
Cast iron can be applied to the compressor core part scroll plate manufacture of high mechanical strength demand.
The basic principles, main features and advantages of the invention have been shown and described above.The technical staff of the industry should
Understand, the above embodiments do not limit the invention in any form, all obtained by the way of equivalent substitution or equivalent transformation
Technical solution is fallen within the scope of protection of the present invention.
Claims (10)
1. a kind of myrmekite ink cast iron, which is characterized in that by percentage to the quality, contain C:3.6%~4.0%, Si:1.6%
~2.0%, Mn:0.4%~0.8%, P:0%~0.25%, S:0.01%~0.04%, Cu:0.20%~0.6%, Sn:
0.04%~0.08%, Cr:0.10%~0.3%, surplus are Fe and adjoint impurity, use in production process and account for molten iron gross mass
The nodulizing rate of 0.30%~0.40% Metamorphism treatment agent control graphite form is 20%~60%.
2. a kind of myrmekite ink cast iron according to claim 1, which is characterized in that in the Metamorphism treatment agent, with quality
Percentages contain: Mg:5.0%~6.0%, Al:0%~1.0%, Si:40%~50%, Ca:1.5%~2.5%, RE:
5.5%~6.5%, surplus Fe, wherein RE represents the summation of lanthanide series rare-earth elements.
3. a kind of myrmekite ink cast iron according to claim 2, which is characterized in that in the Metamorphism treatment agent, Mg and Ce
Quality sum account for entire myrmekite ink cast iron mass percent be 0.02%~0.04%.
4. a kind of myrmekite ink cast iron according to claim 1, which is characterized in that its tensile strength >=450N/mm2, surrender
Intensity >=315N/mm2, elongation percentage≤3%, hardness range be HB200~HB250.
5. a kind of myrmekite ink cast iron according to claim 1, which is characterized in that the Al-Qaeda terrorist organization is pearlite and ferrite
Line and staff control, mass percentage >=90% of the medium pearlite in the Al-Qaeda terrorist organization.
6. a kind of preparation process of myrmekite ink cast iron as claimed in any one of claims 1 to 5, which is characterized in that including such as
Lower step:
S1, melt: main material, leftover pieces and foundry returns being put into intermediate frequency furnace and are warming up to 1380~1450 DEG C of meltings, keep it molten
Be melted into molten iron, detected with phosphorus content of the carbon silicon instrument to molten iron, then with sub-ray spectrometer detection Si%, Mn%, P%, S%,
The content of Cu%, Sn%, Cr%, power-off carries out slagging-off operation for the first time and alloying ingredient is added after analysis, through ingredient point
Second of slagging-off operation is carried out after analysis confirmation；
S2, creepage rate: Metamorphism treatment agent is added into ladle, creepage rate is carried out to molten iron, the Metamorphism treatment agent is lanthanum
It is rare earth magnesium ferrosilicon alloy, mass percentage of each element in Metamorphism treatment agent is respectively as follows: Mg:5.0%~6.0%, Al:
0%~1.0%, Si:40%~50%, Ca:1.5%~2.5%, RE:5.5%~6.5%, surplus Fe, RE represent group of the lanthanides
The summation of rare earth element, creepage rate time are 20~50s；
S3, go out soup: ladle being transferred to stokehold and carries out out soup operation, controls out soup temperature, the molten iron of ladle is poured into and is poured
It casts in basin, the Inoculant that 0.2% is added when subcontracting carries out molten steel preparation to complete to subcontract movement；
Molten iron sampling is carried out before S4, casting, ingredient is analyzed, and ingredient qualification casts and obtains myrmekite ink cast iron.
7. a kind of preparation process of myrmekite ink cast iron according to claim 6, which is characterized in that the main material, side
The mass ratio of corner material and foundry returns three are 10%:30%:60%, include Si, Mn, P, S, Cu, Sn in the alloying ingredient
And one of Cr or a variety of.
8. a kind of preparation process of myrmekite ink cast iron according to claim 6, which is characterized in that going out soup temperature is 1450
~1600 DEG C, Inoculant is silicon barium-ferrum alloy.
9. a kind of preparation process of myrmekite ink cast iron according to claim 6, which is characterized in that S% content is
When 0.01%~0.02%, the additional amount of Metamorphism treatment agent is that molten iron goes out the 0.3% of soup weight；S% content be 0.021%~
When 0.040%, the additional amount of Metamorphism treatment agent is that molten iron goes out the 0.35% of soup weight of molten iron.
10. the whirlpool that a kind of myrmekite ink cast iron as claimed in any one of claims 1 to 5 is used to manufacture heat-pump-type screw compressor
Capstan.
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|---|---|---|---|---|
| CN115141971A (en) * | 2022-07-26 | 2022-10-04 | 苏州勤美达精密机械有限公司 | High-strength hydraulic pump body made of vermicular graphite cast iron and production process thereof |
| CN115141971B (en) * | 2022-07-26 | 2023-11-14 | 苏州勤美达精密机械有限公司 | Vermicular graphite cast iron high-strength hydraulic pump body and production process thereof |
| CN115747629A (en) * | 2022-11-30 | 2023-03-07 | 安庆帝伯格茨缸套有限公司 | Vermicular graphite cast iron base material and preparation method and application thereof |
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