CN114507808B - High-purity hypereutectic niobium-chromium-containing 3 cast iron and application thereof - Google Patents
High-purity hypereutectic niobium-chromium-containing 3 cast iron and application thereof Download PDFInfo
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- 229910001018 Cast iron Inorganic materials 0.000 title claims abstract description 62
- QVZNQFNKKMMPFH-UHFFFAOYSA-N chromium niobium Chemical compound [Cr].[Nb] QVZNQFNKKMMPFH-UHFFFAOYSA-N 0.000 title claims description 9
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 45
- 239000011651 chromium Substances 0.000 claims abstract description 45
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 44
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 38
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 29
- 239000010955 niobium Substances 0.000 claims abstract description 29
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims abstract description 29
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 17
- 239000001257 hydrogen Substances 0.000 claims abstract description 17
- 229910052742 iron Inorganic materials 0.000 claims abstract description 17
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000001301 oxygen Substances 0.000 claims abstract description 16
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 16
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 13
- 150000002910 rare earth metals Chemical class 0.000 claims abstract description 13
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 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 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 11
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 11
- 239000010703 silicon Substances 0.000 claims abstract description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 9
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 9
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims abstract description 9
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 9
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 9
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 9
- 229910052802 copper Inorganic materials 0.000 claims abstract description 9
- 239000010949 copper Substances 0.000 claims abstract description 9
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 9
- 239000011733 molybdenum Substances 0.000 claims abstract description 9
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 9
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 9
- 239000011574 phosphorus Substances 0.000 claims abstract description 9
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 9
- 239000011593 sulfur Substances 0.000 claims abstract description 9
- 239000010936 titanium Substances 0.000 claims abstract description 9
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 9
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 9
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims abstract description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 42
- 239000000843 powder Substances 0.000 claims description 39
- 239000000463 material Substances 0.000 claims description 23
- 229910052757 nitrogen Inorganic materials 0.000 claims description 21
- 239000007789 gas Substances 0.000 claims description 14
- 238000007664 blowing Methods 0.000 claims description 13
- 239000007788 liquid Substances 0.000 claims description 12
- 238000003723 Smelting Methods 0.000 claims description 11
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 10
- 229910052684 Cerium Inorganic materials 0.000 claims description 9
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 9
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 9
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 claims description 9
- 229910052746 lanthanum Inorganic materials 0.000 claims description 9
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 claims description 9
- 239000004571 lime Substances 0.000 claims description 9
- 229910045601 alloy Inorganic materials 0.000 claims description 8
- 239000000956 alloy Substances 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 8
- 239000004575 stone Substances 0.000 claims description 8
- 229910001122 Mischmetal Inorganic materials 0.000 claims description 7
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 6
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 claims description 6
- 239000010436 fluorite Substances 0.000 claims description 6
- 150000002431 hydrogen Chemical class 0.000 claims description 6
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims description 6
- 239000001095 magnesium carbonate Substances 0.000 claims description 6
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims description 6
- 229910052901 montmorillonite Inorganic materials 0.000 claims description 6
- 239000010453 quartz Substances 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 5
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 claims description 5
- 239000010451 perlite Substances 0.000 claims description 5
- 235000019362 perlite Nutrition 0.000 claims description 5
- 239000012535 impurity Substances 0.000 claims description 4
- 238000011081 inoculation Methods 0.000 claims description 4
- 239000002054 inoculum Substances 0.000 claims description 4
- 238000010079 rubber tapping Methods 0.000 claims description 4
- 238000005070 sampling Methods 0.000 claims description 4
- 238000009423 ventilation Methods 0.000 claims description 4
- 241000251131 Sphyrna Species 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 206010039897 Sedation Diseases 0.000 claims description 2
- 238000004458 analytical method Methods 0.000 claims description 2
- 238000000137 annealing Methods 0.000 claims description 2
- 238000013461 design Methods 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 230000035515 penetration Effects 0.000 claims description 2
- 238000010791 quenching Methods 0.000 claims description 2
- 230000000171 quenching effect Effects 0.000 claims description 2
- 238000007670 refining Methods 0.000 claims description 2
- 230000036280 sedation Effects 0.000 claims description 2
- 238000005245 sintering Methods 0.000 claims description 2
- 238000005303 weighing Methods 0.000 claims description 2
- 244000275012 Sesbania cannabina Species 0.000 claims 1
- 239000002002 slurry Substances 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 3
- 241000219782 Sesbania Species 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000007550 Rockwell hardness test Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 238000010183 spectrum analysis Methods 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
- C22C37/06—Cast-iron alloys containing chromium
- C22C37/08—Cast-iron alloys containing chromium with nickel
-
- 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
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses high-purity hypereutectic niobium-containing chromium 3 cast iron, which comprises the following components in percentage by mass: 3.32-3.63% of carbon, 0.05-0.32% of manganese, 2.52-4.50% of chromium, 0.24-0.46% of silicon, 0.01-0.03% of phosphorus, 0.02-0.05% of sulfur, 0.37-0.64% of nickel, 0.12-0.39% of molybdenum, 0.45-0.78% of vanadium, 0.07-0.29% of titanium, 0.25-0.54% of copper, 0.52-0.69% of niobium, 0.11-0.23% of mixed rare earth, less than or equal to 0.00141% of oxygen, less than or equal to 0.00049% of hydrogen and the balance of iron. The Rockwell hardness value of the hypereutectic niobium-chromium-3-containing cast iron prepared by the method is more than 55, the carbide quantity is more than 25%, the hypereutectic niobium-chromium-3-containing cast iron can be used for producing impellers, lining plates and the like, and the hypereutectic niobium-chromium-3-containing cast iron has good application value.
Description
Technical Field
The invention belongs to the technical field of refined chromium cast iron, and particularly relates to high-purity hypereutectic niobium-containing chromium 3 cast iron and application thereof.
Background
The chromium cast iron comprises chromium 3 cast iron according to the different contents of chromium, is one of the wear-resistant materials widely applied at home and abroad at present, and has been widely applied to the production of small (2 inch) pump flow-through parts pump bodies, impellers, hammer heads of small (diameter less than 1 meter) hammer crushers, lining plates and the like. The chromium 3 cast iron produced by the prior art is conventionally prepared by adjusting components to improve properties such as hardness, and the like, which correspondingly increases production cost. Although the mechanical property of the low-chromium cast iron can be improved by adding alloying elements, the content of the alloying elements is too high, the requirements on smelting and heat treatment processes are correspondingly improved, and the process difficulty is increased. Therefore, how to further optimize the process and prepare high-purity hypereutectic niobium-containing chromium 3 cast iron at low cost becomes a new research trend.
Disclosure of Invention
In order to solve the problems of the background technology, the invention provides high-purity hypereutectic cast iron containing niobium and chromium 3 and application thereof.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the high-purity hypereutectic niobium-containing chromium 3 cast iron comprises the following components: carbon, manganese, chromium, silicon, phosphorus, sulfur, nickel, molybdenum, vanadium, titanium, copper, niobium, misch metal, oxygen, hydrogen, iron.
Further, the high-purity hypereutectic cast iron containing niobium and chromium 3 has the oxygen content of less than 15ppm and the hydrogen content of less than 5ppm.
Further, the high-purity hypereutectic cast iron containing niobium and chromium 3 comprises the following components in percentage by mass: 3.32-3.63% of carbon, 0.05-0.32% of manganese, 2.52-4.50% of chromium, 0.24-0.46% of silicon, 0.01-0.03% of phosphorus, 0.02-0.05% of sulfur, 0.37-0.64% of nickel, 0.12-0.39% of molybdenum, 0.45-0.78% of vanadium, 0.07-0.29% of titanium, 0.25-0.54% of copper, 0.52-0.69% of niobium, 0.11-0.23% of mixed rare earth, less than or equal to 0.00141% of oxygen, less than or equal to 0.00049% of hydrogen and the balance of iron.
Further, the high-purity hypereutectic cast iron containing niobium and chromium 3 comprises the following components in percentage by mass: 3.47% carbon, 0.14% manganese, 2.98% chromium, 0.35% silicon, 0.02% phosphorus, 0.03% sulfur, 0.44% nickel, 0.17% molybdenum, 0.56% vanadium, 0.11% titanium, 0.29% copper, 0.58% niobium, 0.16% misch metal, 0.00119% oxygen, 0.00034% hydrogen, the balance being iron.
Further, the mixed rare earth consists of lanthanum and cerium according to the mass ratio of 1-2:0.6-1.
Further, the mixed rare earth consists of lanthanum and cerium according to the mass ratio of 1.3:0.7.
Further, the Rockwell hardness of the high-purity hypereutectic niobium-chromium-3-containing cast iron is greater than 55.
Further, the high purity hypereutectic niobium-chromium 3-containing cast iron has a carbide content of greater than 25%.
The invention also provides application of the high-purity hypereutectic niobium-chromium-containing 3 cast iron, which is applied to the production of a small (2 inch) pump flow passage pump body, an impeller, a hammer head of a small (diameter smaller than 1 m) hammer crusher and a lining plate.
The invention has the following beneficial effects:
according to the invention, nitrogen blowing is adopted to remove impurities, montmorillonite powder, fluorite powder, magnesium carbonate powder, medical stone powder and quartz powder are added into the slag-forming material, and under the mutual cooperation of the five components, the content of impurities such as hydrogen in the hypereutectic niobium-containing chromium 3 cast iron is effectively reduced, and the Rockwell Hardness (HRC) of the hypereutectic niobium-containing chromium 3 cast iron is synergistically improved. The hypereutectic niobium-chromium-3-containing cast iron prepared by the invention has lower hydrogen and oxygen content, rockwell hardness value of more than 55 and carbide quantity of more than 25 percent, is suitable for low-impact and scouring wear working conditions, can meet the requirements of pump bodies, impellers, hammer heads of small hammer crushers (with the diameter of less than 1 meter) for producing small (2 inch) pump flow-through parts, and lining plates, and has better application value.
Detailed Description
For a better understanding of the present invention, reference is made to the following examples, which are included within the scope of the present invention, but are not intended to limit the scope of the present invention.
Example 1
The high-purity hypereutectic niobium-containing chromium 3 cast iron comprises the following components in percentage by mass: 3.38% carbon, 0.09% manganese, 2.73% chromium, 0.27% silicon, 0.01% phosphorus, 0.02% sulfur, 0.51% nickel, 0.16% molybdenum, 0.48% vanadium, 0.08% titanium, 0.34% copper, 0.56% niobium, 0.14% misch metal, 0.00141% oxygen, 0.00049% hydrogen, balance iron;
the mixed rare earth consists of lanthanum and cerium according to the mass ratio of 1:0.6.
Example 2
The high-purity hypereutectic niobium-containing chromium 3 cast iron comprises the following components in percentage by mass: 3.47% carbon, 0.14% manganese, 2.98% chromium, 0.35% silicon, 0.02% phosphorus, 0.03% sulfur, 0.44% nickel, 0.17% molybdenum, 0.56% vanadium, 0.11% titanium, 0.29% copper, 0.58% niobium, 0.16% misch metal, 0.00119% oxygen, 0.00034% hydrogen, balance iron;
the mixed rare earth consists of lanthanum and cerium according to the mass ratio of 1.3:0.7.
Example 3
The high-purity hypereutectic niobium-containing chromium 3 cast iron comprises the following components in percentage by mass: 3.61% carbon, 0.32% manganese, 4.36% chromium, 0.39% silicon, 0.03% phosphorus, 0.05% sulfur, 0.62% nickel, 0.34% molybdenum, 0.72% vanadium, 0.29% titanium, 0.53% copper, 0.61% niobium, 0.2% misch metal, 0.00128% oxygen, 0.00041% hydrogen, balance iron;
the mixed rare earth consists of lanthanum and cerium according to the mass ratio of 2:1.
Example 4
A production process of high-purity hypereutectic niobium-containing chromium 3 cast iron comprises the following steps:
(1) Knotting the crucible: installing the ventilation block at the bottom of a device for refining high-purity hypereutectic niobium-containing chromium 3 cast iron according to the requirement, then knotting a crucible by using a refractory lining material and a mould, drying and sintering;
(2) Manufacturing a gas diffuser according to the device volume size design, wherein the gas diffuser is designed to optimize gas flow and have metal penetration resistance;
(3) The gas diffuser is arranged at the center of the bottom of the device, and the gas inlet pipe of the device is connected with the flow regulator, the pressure reducing valve and the nitrogen cylinder;
(4) Stone ash layer: paving a layer of lime at the bottom of the device, wherein the thickness of the lime layer is 25mm;
(5) Preparing materials: weighing various materials for smelting cast iron according to the chemical composition requirements of the chromium cast iron for standby;
(6) And (3) charging and smelting: gradually putting the prepared raw materials into a device for smelting, when chromium cast iron materials are melted to form a molten pool, namely, when the molten iron covers 29.3cm of the furnace bottom, starting to open a flow regulator to blow nitrogen, and enabling the nitrogen to participate in the molten iron smelting process through a ventilation block until the molten iron is completely melted, wherein the flow of nitrogen blowing is increased along with the increase of the molten iron along with the continuous smelting, and the concrete control process is as follows: the nitrogen blowing flow is controlled to be 15.8-16.7L/min in the first 9-13 min; 14-20min, and controlling the nitrogen blowing flow to 17-17.3L/min; 21-30min, and the nitrogen blowing flow is controlled to be 17.6-17.8L/min;
(7) Inoculation: inoculating the completely melted cast iron liquid obtained in the step (6) by adopting a ladle bottom pouring method, wherein the inoculating treatment is to adopt an inoculant accounting for 2.3 percent of the weight of the cast iron liquid and having the granularity of less than 13mm, and the inoculant comprises an intermediate alloy and a rare earth alloy according to the weight ratio of 2:0.5; the intermediate alloy comprises the following chemical components in percentage by mass: c:1.8%, cr:0.9%, si:0.5%, ni:0.4%, ti:0.2%, mo:0.3% of Fe and the balance of Fe; the rare earth alloy comprises manganese, silicon, lanthanum and cerium according to the mass ratio of 8:5:1.3:0.7;
(8) Covering slag-forming materials on the surface of the cast iron liquid subjected to inoculation treatment in the step (7), wherein the adding amount is 0.73 kg/ton of chromium cast iron; simultaneously blowing nitrogen to treat, controlling the flow rate of the nitrogen blowing gas to be 16.6-17.1L/min until furnace burden is melted down, and sampling and analyzing the components in the furnace;
(9) And (3) adjusting chemical components: according to the sampling analysis result, calculating and adding the adjusting material until the adjusting material is completely melted;
(10) Sedation within the device: after the chromium cast iron liquid in the device reaches the required temperature, power is cut off, the device is calmed, and nitrogen is continuously blown, so that the chromium cast iron liquid is homogenized at the same temperature, impurities and gas fully float upwards and are combined with the liquid level slag-making material;
(11) Temperature control tapping: controlling the temperature, pouring, annealing and quenching after tapping to obtain the high-purity hypereutectic niobium-chromium-3 cast iron with the formula of the example 2.
The slag-forming material in the step (8) comprises the following raw materials in parts by weight: 10 parts of perlite powder, 3 parts of aluminum powder, 15 parts of montmorillonite powder, 3 parts of fluorite powder, 11 parts of talcum powder, 4 parts of passivated lime powder, 6 parts of magnesium carbonate powder, 5 parts of medical stone powder, 2 parts of quartz powder, 3 parts of sesbania gum and 20 parts of water;
the granularity of the perlite powder is 800 meshes;
the granularity of the aluminum powder is 900 meshes;
the quality index of the montmorillonite powder is as follows: siO (SiO) 2 :68.97% and particle size 900 mesh;
the fluorite powder has the following quality indexes: caF (CaF) 2 :75.86% and a particle size of 800 mesh;
the quality index of talcum powder is: siO (SiO) 2 :61.05% with a particle size of 900 mesh;
the quality indexes of the passivated lime raw material are as follows: caO:94.12%; s:0.04%;
the granularity of the magnesium carbonate powder is 900 meshes;
the granularity of the medical stone powder is 900 meshes;
the granularity of the quartz powder is 1000 meshes;
the preparation method of the slag-forming material comprises the following steps:
1) Adding perlite powder, aluminum powder, montmorillonite powder, fluorite powder, talcum powder, passivated lime powder, magnesium carbonate powder, medical stone powder and quartz powder into a stirrer according to parts by weight, and stirring for 1.2 hours at the temperature of 46 ℃ and the rotating speed of 200r/min to prepare slurry a;
2) Adding sesbania gum and water into the slurry a prepared in the step 1), and stirring for 0.6h at the temperature of 43 ℃ and the rotating speed of 200r/min to prepare slurry b;
3) Adding the slurry b prepared in the step 2) into a die, and vacuum-filtering and forming to prepare particles with the particle size of 1 cm;
4) And 3) sending the granules obtained in the step 3) into an oven, and drying at 92 ℃ for 8 hours to obtain the slag-making material.
The hypereutectic niobium-chromium-3-containing cast iron produced in example 4 was tested for Rockwell Hardness (HRC), carbide number and oxygen and hydrogen content, each index was repeated 3 times, and the results were averaged as follows:
| test group | HRC | Carbide quantity (%) | Oxygen content/ppm | Hydrogen content/ppm |
| Example 4 | 57.6 | 25.3 | 11.9 | 3.4 |
Note that: each index in the table is an average value of 3 repeated tests, and the Rockwell hardness test is carried out according to the GB/T230.1 rule; the oxygen and hydrogen content is detected by spectral analysis; "-" means no inspection'.
The table above shows that: (1) The data of example 4 shows that the hypereutectic niobium-chromium-3-containing cast iron obtained by the preparation process of the invention has the oxygen content of 11.9ppm, the hydrogen content of 3.4ppm and the Rockwell Hardness (HRC) value of 57.6, and the preparation process of the invention greatly reduces the oxygen content and the hydrogen content, and the obtained hypereutectic niobium-chromium-3-containing cast iron has larger Rockwell Hardness (HRC) value and improves the performance of products; the obtained carbide has high quantity reaching 25.3 percent, so that the wear resistance of the material is high. The high-purity hypereutectic niobium-chromium-containing 3 cast iron prepared by the method can be used for a small (2 inch) pump flow passage pump body, an impeller, a hammer head of a small (diameter smaller than 1 meter) hammer crusher, a lining plate and the like, and has good application value.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The high-purity hypereutectic niobium-chromium-3-containing cast iron is characterized by comprising the following components in percentage by mass: 3.32-3.63% of carbon, 0.05-0.32% of manganese, 2.52-4.50% of chromium, 0.24-0.46% of silicon, 0.01-0.03% of phosphorus, 0.02-0.05% of sulfur, 0.37-0.64% of nickel, 0.12-0.39% of molybdenum, 0.45-0.78% of vanadium, 0.07-0.29% of titanium, 0.25-0.54% of copper, 0.52-0.69% of niobium, 0.11-0.23% of mixed rare earth, less than or equal to 0.00141% of oxygen, less than or equal to 0.00049% of hydrogen and the balance of iron;
the mixed rare earth consists of lanthanum and cerium according to the mass ratio of 1-2:0.6-1;
the production process of the high-purity hypereutectic niobium-containing chromium 3 cast iron comprises the following steps of:
(1) Knotting the crucible: installing the ventilation block at the bottom of a device for refining high-purity hypereutectic niobium-containing chromium 3 cast iron according to the requirement, then knotting a crucible by using a refractory lining material and a mould, drying and sintering;
(2) Manufacturing a gas diffuser according to the device volume size design, wherein the gas diffuser is designed to optimize gas flow and have metal penetration resistance;
(3) The gas diffuser is arranged at the center of the bottom of the device, and the gas inlet pipe of the device is connected with the flow regulator, the pressure reducing valve and the nitrogen cylinder;
(4) Stone ash layer: paving a layer of lime at the bottom of the device, wherein the thickness of the lime layer is 25mm;
(5) Preparing materials: weighing various materials for smelting cast iron according to the chemical composition requirements of the chromium cast iron for standby;
(6) And (3) charging and smelting: gradually putting the prepared raw materials into a device for smelting, when chromium cast iron materials are melted to form a molten pool, namely, when the molten iron covers 29.3cm of the furnace bottom, starting to open a flow regulator to blow nitrogen, and enabling the nitrogen to participate in the molten iron smelting process through a ventilation block until the molten iron is completely melted, wherein the flow of nitrogen blowing is increased along with the increase of the molten iron along with the continuous smelting, and the concrete control process is as follows: the nitrogen blowing flow is controlled to be 15.8-16.7L/min in the first 9-13 min; 14-20min, and controlling the nitrogen blowing flow to 17-17.3L/min; 21-30min, and the nitrogen blowing flow is controlled to be 17.6-17.8L/min;
(7) Inoculation: inoculating the completely melted cast iron liquid obtained in the step (6) by adopting a ladle bottom pouring method, wherein the inoculating treatment is to adopt an inoculant accounting for 2.3 percent of the weight of the cast iron liquid and having the granularity of less than 13mm, and the inoculant comprises an intermediate alloy and a rare earth alloy according to the weight ratio of 2:0.5; the intermediate alloy comprises the following chemical components in percentage by mass: c:1.8%, cr:0.9%, si:0.5%, ni:0.4%, ti:0.2%, mo:0.3% of Fe and the balance of Fe; the rare earth alloy comprises manganese, silicon, lanthanum and cerium according to the mass ratio of 8:5:1.3:0.7;
(8) Covering slag-forming materials on the surface of the cast iron liquid subjected to inoculation treatment in the step (7), wherein the adding amount is 0.73 kg/ton of chromium cast iron; simultaneously blowing nitrogen to treat, controlling the flow rate of the nitrogen blowing gas to be 16.6-17.1L/min until furnace burden is melted down, and sampling and analyzing the components in the furnace;
(9) And (3) adjusting chemical components: according to the sampling analysis result, calculating and adding the adjusting material until the adjusting material is completely melted;
(10) Sedation within the device: after the chromium cast iron liquid in the device reaches the required temperature, power is cut off, the device is calmed, and nitrogen is continuously blown, so that the chromium cast iron liquid is homogenized at the same temperature, impurities and gas fully float upwards and are combined with the liquid level slag-making material;
(11) Temperature control tapping: controlling the temperature, pouring, annealing and quenching after tapping to obtain high-purity hypereutectic cast iron containing niobium and chromium 3;
the slag-forming material in the step (8) comprises the following raw materials in parts by weight: 10 parts of perlite powder, 3 parts of aluminum powder, 15 parts of montmorillonite powder, 3 parts of fluorite powder, 11 parts of talcum powder, 4 parts of passivated lime powder, 6 parts of magnesium carbonate powder, 5 parts of medical stone powder, 2 parts of quartz powder, 3 parts of sesbania gum and 20 parts of water;
the granularity of the perlite powder is 800 meshes;
the granularity of the aluminum powder is 900 meshes;
the quality index of the montmorillonite powder is as follows: siO (SiO) 2 :68.97% and particle size 900 mesh;
the fluorite powder has the following quality indexes: caF (CaF) 2 :75.86% and a particle size of 800 mesh;
the quality index of talcum powder is: siO (SiO) 2 :61.05% with a particle size of 900 mesh;
the quality indexes of the raw materials of the passivated lime powder are as follows: caO:94.12%; s:0.04%;
the granularity of the magnesium carbonate powder is 900 meshes;
the granularity of the medical stone powder is 900 meshes;
the granularity of the quartz powder is 1000 meshes.
2. The high purity hypereutectic niobium-containing chromium 3 cast iron according to claim 1, comprising the following components in mass percent: 3.47% carbon, 0.14% manganese, 2.98% chromium, 0.35% silicon, 0.02% phosphorus, 0.03% sulfur, 0.44% nickel, 0.17% molybdenum, 0.56% vanadium, 0.11% titanium, 0.29% copper, 0.58% niobium, 0.16% misch metal, 0.00119% oxygen, 0.00034% hydrogen, the balance being iron.
3. The high purity hypereutectic niobium-containing chromium 3 cast iron of claim 2, wherein the misch metal consists of lanthanum and cerium in a mass ratio of 1.3:0.7.
4. A high purity hypereutectic niobium chromium 3 containing cast iron according to any one of claims 1 to 3 wherein the rockwell hardness number is greater than 55.
5. A high purity hypereutectic niobium chromium 3 containing cast iron according to any one of claims 1 to 3 wherein the carbide amount is greater than 25%.
6. Use of a high purity hypereutectic chromium niobium 3 containing cast iron according to any one of claims 1-5, wherein said high purity hypereutectic chromium niobium 3 containing cast iron is used in applications comprising the production of small pump flow parts pump bodies, impellers, small hammer crusher hammerheads, liners.
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