CN114231833B - Reel casting for fan - Google Patents
Reel casting for fan Download PDFInfo
- Publication number
- CN114231833B CN114231833B CN202111307568.4A CN202111307568A CN114231833B CN 114231833 B CN114231833 B CN 114231833B CN 202111307568 A CN202111307568 A CN 202111307568A CN 114231833 B CN114231833 B CN 114231833B
- Authority
- CN
- China
- Prior art keywords
- casting
- fan
- inoculant
- molten iron
- mass
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000005266 casting Methods 0.000 title claims abstract description 79
- 229910052742 iron Inorganic materials 0.000 claims abstract description 63
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 36
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 28
- 239000010439 graphite Substances 0.000 claims abstract description 28
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 27
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 12
- 239000012535 impurity Substances 0.000 claims abstract description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 128
- 239000002054 inoculum Substances 0.000 claims description 41
- 229910052748 manganese Inorganic materials 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 18
- 229910001562 pearlite Inorganic materials 0.000 claims description 13
- 239000002994 raw material Substances 0.000 claims description 10
- 238000003723 Smelting Methods 0.000 claims description 9
- 238000000465 moulding Methods 0.000 claims description 9
- 229910000616 Ferromanganese Inorganic materials 0.000 claims description 8
- 229910000592 Ferroniobium Inorganic materials 0.000 claims description 8
- 229910000805 Pig iron Inorganic materials 0.000 claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 8
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims description 8
- ZFGFKQDDQUAJQP-UHFFFAOYSA-N iron niobium Chemical compound [Fe].[Fe].[Nb] ZFGFKQDDQUAJQP-UHFFFAOYSA-N 0.000 claims description 8
- 239000010959 steel Substances 0.000 claims description 8
- -1 foundry returns Inorganic materials 0.000 claims description 2
- 230000008018 melting Effects 0.000 claims description 2
- 238000002844 melting Methods 0.000 claims description 2
- 238000010079 rubber tapping Methods 0.000 claims description 2
- 239000011572 manganese Substances 0.000 description 25
- 229910001060 Gray iron Inorganic materials 0.000 description 18
- 238000011081 inoculation Methods 0.000 description 16
- 239000010955 niobium Substances 0.000 description 15
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 10
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 9
- 239000011593 sulfur Substances 0.000 description 9
- 239000002245 particle Substances 0.000 description 7
- 238000001816 cooling Methods 0.000 description 6
- 238000007599 discharging Methods 0.000 description 6
- 238000011010 flushing procedure Methods 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 6
- 230000006698 induction Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 229910052758 niobium Inorganic materials 0.000 description 6
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 6
- 238000010791 quenching Methods 0.000 description 6
- 230000000171 quenching effect Effects 0.000 description 6
- 238000005496 tempering Methods 0.000 description 6
- 229910001018 Cast iron Inorganic materials 0.000 description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 5
- 229910052710 silicon Inorganic materials 0.000 description 5
- 239000010703 silicon Substances 0.000 description 5
- 239000011159 matrix material Substances 0.000 description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 3
- 230000001965 increasing effect Effects 0.000 description 3
- 239000011574 phosphorus Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005496 eutectics Effects 0.000 description 2
- 238000005087 graphitization Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910001037 White iron Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000003776 cleavage reaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000007017 scission Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/08—Manufacture of cast-iron
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention provides a shaft disc casting for a fan, which comprises the following components in percentage by mass: c:3.16% -3.30%, si:1.79% -1.93%, mn:0.89% -1.04%, nb:0.02% -0.06%, S:0.094% -0.125%, P:0.12 to 0.17 percent of Fe and the balance of inevitable impurities. According to the shaft disc casting for the fan, the microstructure with the A-type graphite accounting for more than 95% can be obtained, so that the tensile strength of the casting is effectively improved, and the high use requirement of the shaft disc for the fan is met.
Description
Technical Field
The invention relates to the technical field of cast iron, in particular to a shaft disc casting for a fan.
Background
The shaft disc for the fan is a part which plays a role in connection on a transmission shaft of the industrial fan. Because the rotating speed of the fan is fast and the stress is large when the shaft disc is used, the requirements on the internal quality and the tensile strength of the shaft disc for the fan are high, the cast iron has no residual internal stress, and the defects of cracks, cold shut, shrinkage cavities, slag inclusion, penetrability pores and the like which influence the performance of the cast iron are also not allowed to exist in the cast iron.
Since the advent of gray cast iron, it has been widely used in the mechanical industry because of its superior overall properties to other materials, especially alloyed HT250, which can be used in special demanding places such as axle disks and machine tools. Although the existing shaft disc for the fan, which is produced by HT250, is low in price, the tensile strength of the shaft disc cannot meet the requirements of modern industry on high performance and long service life of the shaft disc for the fan.
For the gray cast iron of the shaft disc for the fan, the tensile strength of the gray cast iron is mainly determined by the gray iron material, the graphite in the general gray cast iron is flaky, the strength, the plasticity and the toughness of the flaky graphite are almost zero, and the existence of the graphite is equivalent to the existence of holes and microcracks, so that the continuity of a matrix is damaged, the effective stress area of the matrix is reduced, and stress concentration is formed at the tip of a graphite flake, so that the material is subjected to brittle fracture. The greater the number of graphite flakes, the coarser the size, the less uniform the distribution, and the lower the tensile strength and plasticity of the gray cast iron, with type C graphite having the greatest effect on the cleavage of the matrix, followed by type D + E graphite.
Based on the above analysis, how to obtain high-performance gray cast iron with high strength and high proportion of type a graphite as indexes for a shaft disc for a fan is a direction worth long-term exploration.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides the hub casting for the fan, and the casting can obtain a microstructure with the proportion of A-type graphite exceeding 95%, so that the tensile strength of the casting is effectively improved, and the high use requirement of the hub for the fan is met.
The invention provides a shaft disc casting for a fan, which comprises the following components in percentage by mass: c:3.16% -3.30%, si:1.79% -1.93%, mn:0.89% -1.04%, nb:0.02% -0.06%, S:0.094% -0.125%, P:0.12 to 0.17 percent of Fe and the balance of inevitable impurities.
The composition and content proportion are controlled in the invention, so that the reason for improving the mechanical property of the obtained casting is as follows:
carbon (C): in the prior art, the carbon equivalent is reduced when the strength of the gray cast iron casting is improved, or the pearlite proportion in the gray cast iron is improved by improving the manganese content, so that the strength is improved; however, the method of increasing the strength of gray cast iron by decreasing the carbon equivalent has many disadvantages such as deterioration of process properties, increased tendency to white cast iron, difficulty in processing, etc.; the invention finally controls the carbon content in the casting to be 3.16-3.30%, and combines with the precise control of other alloy elements, so as to effectively improve the strength of the casting on the premise of improving the carbon content as much as possible and not influencing the processability;
silicon (Si): silicon is an element for promoting graphitization, and the contraction tendency is reduced along with the increase of the silicon content in the gray cast iron casting, so that the silicon content is controlled in a lower range when the high-strength gray cast iron is produced, and the silicon content is controlled to be 1.79-1.93 percent;
manganese (Sn): manganese strongly promotes and stabilizes pearlite, thereby enhancing the strength of the gray cast iron casting; however, manganese has a dual effect on the strength of gray cast iron castings: on one hand, manganese can promote the formation of pearlite, refine the pearlite and contribute to improving the strength; on the other hand, the manganese content is too high, so that nucleation during molten iron crystallization is influenced, the number of eutectic clusters is reduced, graphite is coarse, and the strength is reduced; in order to balance the influence of the two aspects, the manganese content is controlled to be 0.89-1.04 percent in the invention.
Niobium (Nb): in the present invention, when the niobium content is more than 0.02%, a small amount of D, E type graphite appears. The tensile strength and hardness of the casting are gradually increased along with the increase of the niobium content, but the increase range of the tensile strength and hardness is obviously reduced after the niobium content exceeds 0.06 percent; therefore, the content of niobium is controlled to be 0.02 to 0.06 percent;
sulfur (S): sulfur is a harmful element; however, in the production of gray cast iron castings it was found that: the sulfur content is in a certain range, the length of the flake graphite is shortened along with the increase of the sulfur content, the graphite form is bent and passivated, eutectic clusters are refined, and the strength is improved; according to the invention, through a large number of experiments, the sulfur content is controlled to be 0.094-0.125%, so that the inoculation effect can be enhanced, the graphite form can be improved, the strength of the gray cast iron casting can be improved, and the machining performance can be improved.
Phosphorus (P): the phosphorus content in the gray cast iron casting is generally less than 0.20 percent, and in order to obtain the casting with wear resistance and high fluidity, the phosphorus content is controlled to be 0.12 to 0.17 percent.
Preferably, [ Mn ] =2.1, [ S ] + ex%, the value of ex is 0.69-0.76, and 0.39 ≧ Nb ]/[ S ] > 0.32, and [ Mn ], [ Nb ], [ S ] are the mass percent contents of Mn, nb, S, respectively.
Manganese and sulfur have higher affinity at high temperature, can form a MnS compound, and the melting point of MnS is above 1600 ℃, can be used as a heterogeneous crystal nucleus of graphite and is beneficial to the precipitation of the graphite; the invention creatively finds that the content of manganese and sulfur is limited by a relational expression that [ Mn ] =2.1[ S ] + ex%, and the value of ex is 0.69-0.76, and when the content of manganese and sulfur meets the relational expression, the tensile strength is optimal;
niobium, like manganese, can also form NbS compounds with sulfur, which can promote graphitization of cast iron, improve graphite morphology, and is particularly advantageous for the formation of a-type graphite. However, it is noted that the magnitude of [ Nb ]/[ S ] has a large influence on the properties of gray cast iron, and that the tensile strength can be effectively improved even when the value of [ Nb ]/[ S ] is 0.32 to 0.39.
Preferably, the A-type graphite accounts for not less than 95% of the microstructure of the casting, and the pearlite accounts for not less than 98%.
Preferably, the shaft disc casting for the fan is prepared by the following method:
(1) Adding scrap steel, pig iron, foundry returns, graphite recarburizers, ferromanganese and ferroniobium as raw materials into a smelting furnace to be smelted to form molten iron;
(2) And adding an in-ladle inoculant to perform inoculation treatment after molten iron is discharged from a furnace, pouring the molten iron into a casting mold cavity to perform casting molding, and adding a stream-following inoculant to perform stream-following inoculation treatment in the pouring process to obtain the shaft disc casting for the fan.
The correct selection of raw materials is a necessary condition for obtaining high-quality molten iron, which not only influences the chemical components of castings, but also has great influence on the structure; due to different microelements contained in the charging materials, although the same chemical components and the same molten iron treatment mode are adopted, the obtained results may be quite different. The invention controls the selection of the raw materials, and can effectively improve and stably ensure the metallographic structure and the mechanical property of the casting. Meanwhile, by effectively selecting the inoculant, the matrix structure can be refined, the graphite form can be changed, the chilling tendency can be reduced, and the processing performance can be improved.
Preferably, the smelting temperature is 1520-1550 ℃ and the time is 5-10min.
Preferably, the tapping temperature of the molten iron is 1480-1500 ℃.
Preferably, the in-ladle inoculant is a 65SiBaFe inoculant with the grain diameter of 3-5 mm, and the addition amount of the inoculant is 0.1-0.4% of the mass of the molten iron.
Preferably, the stream inoculant is a 65SiBaFe inoculant with the grain size of 0.1-0.4 mm, and the addition amount of the stream inoculant is 0.01-0.05% of the mass of the molten iron.
Preferably, the casting molding temperature is 1390 to 1450 ℃.
Compared with the prior art, the invention has the following beneficial effects:
the invention takes the HT250 material of the axial disc casting for the fan as the basis, the influence of Mn, nb, S and other elements on the HT250 structure and performance is experimentally researched, the Mn, nb and S are used as the entry points for micro-alloying, the content proportion relation of the Mn, nb and S is controlled, and the composite inoculation measure is adopted to obtain the A-type graphite accounting for over 95 percent and the pearlite accounting for over 98 percent, thereby finally stably ensuring and effectively improving the metallographic structure and the mechanical property of the casting. When the material is applied to production of the shaft disc casting for the fan, the chemical composition is standard, the casting process is reasonable, the defects of shrinkage cavity, shrinkage porosity and the like are avoided, the yield is improved, meanwhile, the compression resistance is excellent, and the requirement of the fan on the performance of the shaft disc is met.
Detailed Description
The technical solutions of the present invention are described in detail below by specific examples, but it should be clear that these examples are presented for illustration and are not to be construed as limiting the scope of the present invention.
Example 1
A shaft disc casting for a fan comprises the following components in percentage by weight: c:3.23%, si:1.85%, mn:0.96%, nb:0.041%, S:0.11%, P:0.15%, and the balance of Fe and inevitable impurities;
the mass percentage contents of Mn, nb and S satisfy the following relation: [ Mn ] =2.1[ S ] + ex%, value of ex is 0.69-0.76, while 0.39 ≧ Nb ]/[ S ] > 0.32.
The method for preparing the shaft disc casting for the fan comprises the following steps:
(1) Calculating the adding proportion and weight of each raw material according to the components, adding ferromanganese, ferroniobium and pig iron into a medium-frequency induction furnace, adding scrap steel and foundry returns, heating to 1540 ℃, smelting, standing for 10min to form molten iron, and discharging when the temperature is controlled to 1480 ℃ after quenching and tempering;
(2) Adding an inoculant in the ladle into the discharged molten iron, then flushing the molten iron into a discharged iron ladle for inoculation, wherein the inoculant in the ladle is 65SiBaFe, the grain diameter is 3-5 mm, the adding amount is 0.2% of the mass of the discharged molten iron, slagging off, pouring the molten iron into a casting mold cavity for casting molding, adding a stream-following inoculant for stream inoculation in the pouring process, the stream-following inoculant is 65SiBaFe, the granularity is 0.1-0.4 mm, the adding amount is 0.03% of the mass of the discharged molten iron, and cooling to room temperature to obtain the shaft disc casting for the fan.
According to GB/T231-2009 test standards, the tensile strength of the shaft disc casting for the fan reaches 345MPa, the surface hardness reaches 231HBW, the quantity of A-type graphite is more than 95%, and the pearlite content is more than 98%.
Example 2
A shaft disc casting for a fan comprises the following components in percentage by weight: c:3.16%, si:1.93%, mn:0.89%, nb:0.030%, S:0.094%, P:0.17%, and the balance of Fe and inevitable impurities;
the mass percentage contents of Mn, nb and S satisfy the following relation: [ Mn ] =2.1[ S ] + ex%, value of ex is 0.69-0.76, while 0.39 ≧ Nb ]/[ S ] > 0.32.
The method for preparing the shaft disc casting for the fan comprises the following steps:
(1) Calculating the adding proportion and weight of each raw material according to the components, firstly adding ferromanganese, ferroniobium and pig iron into a medium-frequency induction furnace, then adding scrap steel and foundry returns, heating to 1530 ℃, smelting, standing for 5min to form molten iron, and discharging when the temperature is controlled to 1500 ℃ after quenching and tempering;
(2) Adding an inoculant in the ladle into the discharged molten iron, then flushing the molten iron into a discharged iron ladle for inoculation, wherein the inoculant in the ladle is 65SiBaFe, the particle size is 3-5 mm, the adding amount is 0.4% of the mass of the discharged molten iron, slagging off, pouring the molten iron into a mold cavity for casting molding, adding a flow-following inoculant in the pouring process for flow-following inoculation, the flow-following inoculant is 65SiBaFe, the particle size is 0.1-0.4 mm, the adding amount is 0.01% of the mass of the discharged molten iron, and cooling the molten iron to room temperature to obtain the shaft disc casting for the fan.
According to the GB/T231-2002 test standard, the tensile strength of the shaft disc casting for the fan reaches 324MPa, the surface hardness reaches 225HBW, the quantity of A-type graphite is more than 95%, and the pearlite content is more than 98%.
Example 3
A shaft disc casting for a fan comprises the following components in percentage by weight: c:3.30%, si:1.79%, mn:1.02%, nb:0.046%, S:0.125%, P:0.12%, and the balance of Fe and inevitable impurities;
the mass percentages of Mn, nb and S satisfy the following relations: [ Mn ] =2.1[ S ] + ex%, value of ex is 0.69-0.76, and 0.39 ≧ Nb ]/[ S ] > is 0.32 or more.
The method for preparing the shaft disc casting for the fan comprises the following steps:
(1) Calculating the adding proportion and weight of each raw material according to the components, firstly adding ferromanganese, ferroniobium and pig iron into a medium-frequency induction furnace, then adding scrap steel and foundry returns, heating to 1550 ℃ for smelting, standing for 10min to form molten iron, and discharging when the temperature is controlled to 1480 ℃ after quenching and tempering;
(2) Adding an inoculant in the ladle into the discharged molten iron, then flushing the molten iron into a discharged iron ladle for inoculation, wherein the inoculant in the ladle is 65SiBaFe, the particle size is 3-5 mm, the adding amount is 0.1% of the mass of the discharged molten iron, slagging off, pouring the molten iron into a casting mold cavity for casting molding, adding a stream-following inoculant for stream inoculation in the pouring process, the stream-following inoculant is 65SiBaFe, the granularity is 0.1-0.4 mm, the adding amount is 0.05% of the mass of the discharged molten iron, and cooling to room temperature to obtain the shaft disc casting for the fan.
According to the GB/T231-2009 test standard, the tensile strength of the shaft disc casting for the fan reaches 333MPa, the surface hardness reaches 228HBW, the quantity of A-type graphite is more than 95%, and the pearlite content is more than 98%.
Example 4
A shaft disc casting for a fan comprises the following components in percentage by weight: c:3.25%, si:1.80%, mn:0.92%, nb:0.033%, S:0.10%, P:0.14%, and the balance of Fe and inevitable impurities;
the mass percentages of Mn, nb and S satisfy the following relations: [ Mn ] =2.1[ S ] + ex%, value of ex is 0.69-0.76, while 0.39 ≧ Nb ]/[ S ] > 0.32.
The method for preparing the shaft disc casting for the fan comprises the following steps:
(1) Calculating the adding proportion and weight of each raw material according to the components, firstly adding ferromanganese, ferroniobium and pig iron into a medium-frequency induction furnace, then adding scrap steel and foundry returns, heating to 1530 ℃, smelting, standing for 5min to form molten iron, and discharging when the temperature is controlled to 1500 ℃ after quenching and tempering;
(2) Adding an inoculant in the ladle into the discharged molten iron, then flushing the molten iron into a discharged iron ladle for inoculation, wherein the inoculant in the ladle is 65SiBaFe, the particle size is 3-5 mm, the adding amount is 0.3% of the mass of the discharged molten iron, slagging off, pouring the molten iron into a mold cavity for casting molding, adding a flow-following inoculant in the pouring process for flow-following inoculation, the flow-following inoculant is 65SiBaFe, the particle size is 0.1-0.4 mm, the adding amount is 0.02% of the mass of the discharged molten iron, and cooling the molten iron to room temperature to obtain the shaft disc casting for the fan.
According to the GB/T231-2002 test standard, the tensile strength of the shaft disc casting for the fan reaches 340MPa, the surface hardness reaches 228HBW, the quantity of A-type graphite is more than 95%, and the pearlite content is more than 98%.
Comparative example 1
A shaft disc casting for a fan comprises the following components in percentage by weight: c:3.24%, si:1.88%, mn:0.85%, nb:0.016%, S:0.092%, P:0.15%, and the balance of Fe and inevitable impurities;
the method for preparing the shaft disc casting for the fan comprises the following steps:
(1) Calculating the adding proportion and weight of each raw material according to the components, firstly adding ferromanganese, ferroniobium and pig iron into a medium-frequency induction furnace, then adding scrap steel and foundry returns, heating to 1540 ℃, smelting, standing for 10min to form molten iron, and discharging when the temperature is controlled to 1480 ℃ after quenching and tempering;
(2) Adding an inoculant in the ladle into the discharged molten iron, then flushing the molten iron into a discharged iron ladle for inoculation, wherein the inoculant in the ladle is 65SiBaFe, the grain diameter is 3-5 mm, the adding amount is 0.2% of the mass of the discharged molten iron, slagging off, pouring the molten iron into a casting mold cavity for casting molding, adding a stream-following inoculant for stream inoculation in the pouring process, the stream-following inoculant is 65SiBaFe, the granularity is 0.1-0.4 mm, the adding amount is 0.03% of the mass of the discharged molten iron, and cooling to room temperature to obtain the shaft disc casting for the fan.
According to the GB/T231-2002 test standard, the tensile strength of the fan shaft disc casting reaches 254MPa, the surface hardness reaches 224HBW, the number of the A-type graphite is only below 80%, and the pearlite content is also only below 90%.
Comparative example 2
A shaft disc casting for a fan comprises the following components in percentage by weight: c:3.24%, si:1.82%, mn:0.93%, nb:0.03%, S:0.12%, P:0.15%, and the balance of Fe and inevitable impurities.
The method for preparing the shaft disc casting for the fan comprises the following steps:
(1) Calculating the adding proportion and weight of each raw material according to the components, firstly adding ferromanganese, ferroniobium and pig iron into a medium-frequency induction furnace, then adding scrap steel and foundry returns, heating to 1540 ℃, smelting, standing for 10min to form molten iron, and discharging when the temperature is controlled to 1480 ℃ after quenching and tempering;
(2) Adding an inoculant in the ladle into the discharged molten iron, then flushing the molten iron into a discharged iron ladle for inoculation, wherein the inoculant in the ladle is 65SiBaFe, the particle size is 3-5 mm, the adding amount is 0.2% of the mass of the discharged molten iron, slagging off, pouring the molten iron into a mold cavity for casting molding, adding a flow-following inoculant in the pouring process for flow-following inoculation, the flow-following inoculant is 65SiBaFe, the particle size is 0.1-0.4 mm, the adding amount is 0.03% of the mass of the discharged molten iron, and cooling the molten iron to room temperature to obtain the shaft disc casting for the fan.
According to the GB/T231-2002 test standard, the tensile strength of the fan shaft disc casting reaches 298MPa, the surface hardness reaches 238HBW, the quantity of A-type graphite is only about 85%, and the pearlite content is only about 95%.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered as the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.
Claims (7)
1. The shaft disc casting for the fan is characterized by comprising the following components in percentage by mass: c:3.16% -3.30%, si:1.79% -1.93%, mn:0.92% -1.04%, nb:0.02% -0.046%, S:0.094% -0.125%, P:0.12 to 0.17 percent of Fe and the balance of inevitable impurities;
wherein [ Mn ] =2.1[ S ] + ex%, the value of ex is 0.69-0.76, and simultaneously 0.39 ≥ Nb ]/[ S ] > is ≥ 0.32, and [ Mn ], [ Nb ], [ S ] are the mass percentage contents of Mn, nb and S respectively;
the A-type graphite accounts for not less than 95% of the microstructure of the casting, and the pearlite accounts for not less than 98%.
2. The hub casting for the fan as claimed in claim 1, wherein the casting is prepared by the following method:
(1) Adding scrap steel, pig iron, foundry returns, graphite recarburizers, ferromanganese and ferroniobium as raw materials into a smelting furnace to be smelted to form molten iron;
(2) And adding a ladle inoculant to inoculate after the molten iron is discharged from the furnace, pouring the molten iron into a mold cavity for molding by casting, and adding a stream-following inoculant to inoculate along with the stream in the pouring process to obtain the shaft disc casting for the fan.
3. The hub casting for the fan as claimed in claim 2, wherein the melting temperature is 1520 ℃ to 1550 ℃ and the time is 5min to 10min.
4. The reel casting for the fan as recited in claim 2 or 3, wherein the tapping temperature of the molten iron is 1480-1500 ℃.
5. The axial disc casting for the fan as claimed in claim 2 or 3, wherein the in-ladle inoculant is 65SiBaFe inoculant with the grain diameter of 3mm-5mm, and the addition amount of the in-ladle inoculant is 0.1% -0.4% of the mass of the molten iron.
6. The axial disc casting for the fan as claimed in claim 2 or 3, wherein the stream inoculant is 65SiBaFe inoculant, the grain size is 0.1mm-0.4mm, and the addition amount of the stream inoculant is 0.01% -0.05% of the mass of the molten iron.
7. The axial disc casting for the wind turbine as claimed in claim 2 or 3, wherein the casting temperature is 1390-1450 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111307568.4A CN114231833B (en) | 2021-11-05 | 2021-11-05 | Reel casting for fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111307568.4A CN114231833B (en) | 2021-11-05 | 2021-11-05 | Reel casting for fan |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114231833A CN114231833A (en) | 2022-03-25 |
| CN114231833B true CN114231833B (en) | 2022-11-04 |
Family
ID=80748536
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111307568.4A Active CN114231833B (en) | 2021-11-05 | 2021-11-05 | Reel casting for fan |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114231833B (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8333923B2 (en) * | 2007-02-28 | 2012-12-18 | Caterpillar Inc. | High strength gray cast iron |
| CN107881408B (en) * | 2017-11-24 | 2019-11-19 | 江西久旺汽车配件制造有限公司 | A kind of metallographic graphite passivation gray cast iron and preparation method thereof |
-
2021
- 2021-11-05 CN CN202111307568.4A patent/CN114231833B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN114231833A (en) | 2022-03-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103510020B (en) | Spring steel wire rod and inclusion control method thereof | |
| CN109252097A (en) | A kind of non-hardened and tempered steel and its continuous casting manufacturing technique of high intensity fractured connecting rod | |
| CN109594010B (en) | Method for producing as-cast QT950-4 crankshaft by adopting all-steel scrap | |
| CN105506442B (en) | A kind of Si Mn alloyings wear-resisting ductile iron abrading-ball and preparation method thereof | |
| CN107716901A (en) | Wearable ductile iron composite roll and its casting method | |
| CN102400032B (en) | Large-cross-section nodular cast iron | |
| CN103789600A (en) | Hypereutectic high-chromium iron preparation method | |
| CN112143970B (en) | High-strength high-toughness non-quenched and tempered front axle steel and production method thereof | |
| CN109161650B (en) | Low-alloy cast steel, manufacturing method and application thereof | |
| CN103484794B (en) | Multi-component alloy cast iron preparation method | |
| CN110066959B (en) | High-strength low-sulfur high-manganese inoculated gray cast iron material and smelting and pouring process thereof | |
| CN114231833B (en) | Reel casting for fan | |
| CN110423937B (en) | Alloyed gray cast iron resisting corrosion of high-temperature aluminum and zinc liquid and smelting process thereof | |
| CN104651705B (en) | A kind of hypereutectic antiwear high-chromium cast iron and preparation method thereof | |
| CN109609835B (en) | High-toughness wear-resistant nodular cast iron and preparation process and application thereof | |
| CN1044496C (en) | Assembly guide board for multiple high chromium caststeel mill and manufacture method thereof | |
| CN107723582B (en) | High-aluminum high-temperature-resistant nodular cast iron containing molybdenum and chromium elements and preparation method thereof | |
| CN114411049B (en) | Low-cost and high-strength ferritic nodular cast iron and preparation method and application thereof | |
| CN115537642A (en) | Method for refining hypereutectic high-chromium cast iron primary carbide | |
| CN110438280B (en) | High-strength synthetic cast iron inoculant and preparation method thereof | |
| CN115058643A (en) | High-strength gray iron machine tool casting and preparation method thereof | |
| CN114369756A (en) | As-cast QT700-8 material and casting method and application thereof | |
| CN113737085A (en) | Nodular cast iron axle housing and manufacturing method thereof | |
| CN110938775A (en) | High-strength cast steel and manufacturing method thereof | |
| CN112575241A (en) | High-strength high-elongation as-cast nodular cast iron |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: A type of shaft and disc casting for fans Granted publication date: 20221104 Pledgee: China Postal Savings Bank Limited by Share Ltd. Ningguo branch Pledgor: NINGGUO DONGFANG MILLING MATERIAL CO.,LTD. Registration number: Y2024980000862 |
|
| PE01 | Entry into force of the registration of the contract for pledge of patent right |