CN117161317B - Casting and smelting process for CW12MW material - Google Patents
Casting and smelting process for CW12MW material Download PDFInfo
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- 239000000463 material Substances 0.000 title claims abstract description 96
- 238000005266 casting Methods 0.000 title claims abstract description 81
- 238000003723 Smelting Methods 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 29
- 230000008569 process Effects 0.000 title claims abstract description 20
- 238000007872 degassing Methods 0.000 claims abstract description 59
- 239000000126 substance Substances 0.000 claims abstract description 34
- 238000004519 manufacturing process Methods 0.000 claims abstract description 16
- 238000004140 cleaning Methods 0.000 claims abstract description 13
- 238000002360 preparation method Methods 0.000 claims abstract description 13
- 238000002844 melting Methods 0.000 claims abstract description 8
- 230000008018 melting Effects 0.000 claims abstract description 8
- 238000007711 solidification Methods 0.000 claims abstract description 7
- 230000008023 solidification Effects 0.000 claims abstract description 7
- 239000000956 alloy Substances 0.000 claims description 43
- 229910045601 alloy Inorganic materials 0.000 claims description 41
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 36
- 239000003795 chemical substances by application Substances 0.000 claims description 31
- 239000002344 surface layer Substances 0.000 claims description 29
- 239000011248 coating agent Substances 0.000 claims description 24
- 238000000576 coating method Methods 0.000 claims description 24
- 239000002994 raw material Substances 0.000 claims description 22
- 238000004321 preservation Methods 0.000 claims description 19
- 229910052786 argon Inorganic materials 0.000 claims description 18
- 239000007789 gas Substances 0.000 claims description 17
- 239000007788 liquid Substances 0.000 claims description 17
- 239000010410 layer Substances 0.000 claims description 14
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 14
- 150000002910 rare earth metals Chemical class 0.000 claims description 14
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 13
- 235000019738 Limestone Nutrition 0.000 claims description 11
- 239000006028 limestone Substances 0.000 claims description 11
- 238000005260 corrosion Methods 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 8
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 230000001681 protective effect Effects 0.000 claims description 6
- 239000004576 sand Substances 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 229910052726 zirconium Inorganic materials 0.000 claims description 6
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 239000012535 impurity Substances 0.000 abstract description 6
- 230000000052 comparative effect Effects 0.000 description 10
- 239000011572 manganese Substances 0.000 description 10
- 230000007797 corrosion Effects 0.000 description 8
- 229910052751 metal Inorganic materials 0.000 description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 7
- 239000002184 metal Substances 0.000 description 7
- 239000000203 mixture Substances 0.000 description 7
- 239000001301 oxygen Substances 0.000 description 7
- 229910052760 oxygen Inorganic materials 0.000 description 7
- 239000011575 calcium Substances 0.000 description 5
- 239000002893 slag Substances 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000009851 ferrous metallurgy Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 150000003568 thioethers Chemical class 0.000 description 2
- 229910000628 Ferrovanadium Inorganic materials 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- XEQZXHPGUAHHPE-UHFFFAOYSA-N [Mn].[Ca].[Si] Chemical compound [Mn].[Ca].[Si] XEQZXHPGUAHHPE-UHFFFAOYSA-N 0.000 description 1
- OLBVUFHMDRJKTK-UHFFFAOYSA-N [N].[O] Chemical compound [N].[O] OLBVUFHMDRJKTK-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- 238000006243 chemical reaction Methods 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
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 229910000856 hastalloy Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- PNXOJQQRXBVKEX-UHFFFAOYSA-N iron vanadium Chemical compound [V].[Fe] PNXOJQQRXBVKEX-UHFFFAOYSA-N 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 239000002516 radical scavenger Substances 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
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- 238000000926 separation method Methods 0.000 description 1
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Classifications
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- 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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- Continuous Casting (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a CW12MW material, wherein the chemical components of the CM12MW material comprise: c is less than or equal to 0.12%; si is less than or equal to 1.0%; mn is less than or equal to 1.0%; p is less than or equal to 0.03%; s is less than or equal to 0.02%; cr:15.5 to 17.5 percent; mo:16.0 to 18.0 percent; fe:4.5 to 7.5 percent; v:0.2 to 0.4 percent; w:3.75 to 5.25 percent; the balance being Ni. The invention also discloses a casting and smelting process of the CW12MW material, which comprises the steps of shell making, shell mold cleaning, material preparation before smelting, deoxidization and degassing, casting and solidification, wherein the deoxidization and degassing agent A is added in the melting stage and the deoxidization and degassing agent B is added in the casting stage, so that the problem that air holes are generated on the surface of the casting due to impurity gas residues is improved, the smoothness and quality of the surface of the casting are improved, the production cost is reduced, and the casting process has higher economic value.
Description
Technical Field
The invention belongs to the technical field of alloy materials, and relates to a casting and smelting process of a CW12MW material.
Background
The hastelloy (CW 12 MW) has excellent corrosion resistance and can resist the corrosion of various corrosive mediums such as strong acid, alkali, oxide and the like; has the advantages of high strength and hardness, and good heat resistance, can bear the action of high stress and pressure; and the high mechanical strength and the high structural stability are maintained in a high-temperature environment. Accordingly, CW12MW materials are widely required in corrosive environments such as the chemical industry and the petroleum industry. Precise control of the CW12MW composition is an important difficulty in the manufacturing process, however, as minor deviations in alloy composition can lead to significant changes in performance; in the smelting process, deoxidation and deslagging are key steps for obtaining qualified high-quality alloy liquid, impurities and gas residues can be introduced due to incomplete purification and degassing, and the quality of the alloy is affected; in the casting process, parameters such as temperature, casting speed and the like need to be controlled to ensure that a structure with stable size and fine crystallization is obtained. These difficulties require careful monitoring and handling in the preparation of CW12MW to ensure compositional consistency and quality of the alloy. Meanwhile, further research and process optimization can help to overcome difficulties in the preparation process and improve the preparation efficiency and quality of CW12 MW.
Disclosure of Invention
The invention aims to provide a casting and smelting process of a CW12MW material, which is characterized in that a deoxidizing and degassing agent A is added in a melting stage and a deoxidizing and degassing agent B is added in a pouring stage, so that the problem that air holes are generated on the surface of a casting due to impurity gas residues is excellently improved, and the smoothness and quality of the surface of an alloy casting are improved.
Generally, a CW12MW smelting process typically includes the steps of: raw material proportioning, smelting, casting and quenching. First, the raw materials need to be dosed to ensure that the proportions of the various metallic elements in the alloy are as expected. Next, the raw materials are charged into a high-temperature melting furnace, and melted. In the furnace, the raw materials will be heated to a temperature above the melting point, causing them to become liquid. At this time, gas and impurities in the smelting process are removed, and the quality of the alloy liquid is ensured. After smelting is completed, the alloy liquid needs to be poured into a mould. During casting, attention is paid to the temperature and cooling rate to ensure the structure and properties of the alloy. Finally, the casting is cooled. In the smelting process, the smelting temperature and the proportion of alloy elements need to be controlled so as to ensure that the components and mechanical properties of the final product reach the standards.
The aim of the invention can be achieved by the following technical scheme:
a casting and smelting process for CW12MW materials comprises the following specific steps:
1) And (3) shell manufacturing: coating two layers of surface layers on a wax mould to obtain a wax-containing shell mould, wherein the raw materials for coating the two layers of surface layers are the same, and any one or more of black lead powder, carbon powder or zirconium sand are added into the raw materials;
the coating of the two surface layers further reinforces the inner surface of the shell, can form a fine inner surface layer shell, prevents alloy liquid from penetrating through the surface layers and reacting with the back layer, and is favorable for fine and smooth casting surfaces.
2) Shell mold cleaning: dewaxing a wax-containing shell mold, cleaning the inner surface of the shell mold with hot water, and drying to obtain a shell mold with no residues in the inner cavity;
3) Smelting raw material preparation: preparing materials according to chemical components of the CM12MW material and baking;
4) Smelting: introducing protective gas into the intermediate frequency furnace, adding limestone, adding chemical components of the CM12MW material into the intermediate frequency furnace, and heating and smelting;
the purpose of adding limestone is to manufacture and stabilize slag, the limestone can react with other ores or oxides at high temperature to form stable slag, the slag is a byproduct in the smelting process, and the limestone can play a role in protecting a molten pool and molten metal in metal smelting, thereby being beneficial to improving the stability and the fluidity of the slag and promoting the separation of the molten metal and the slag; limestone can be decomposed into calcium oxide (lime) at high temperature, and heat generated by decomposition can be used for increasing the temperature in the furnace, so that the smelting reaction speed and the metal melting efficiency can be improved; in some metal smelting processes, impurities such as sulfur and the like may be contained in metal ores, calcium oxide in limestone can react with sulfides, so that removal of the sulfides is promoted, and sulfur content in the metal is reduced;
5) Deoxidizing and degassing: after all chemical components of the CM12MW material are melted, adding a deoxidizing and degassing agent A into the chemical components of the melted CM12MW material to deoxidize and degas, and deslagging to obtain alloy liquid after deoxidizing, degassing and deslagging;
6) Pouring: cooling the alloy liquid subjected to deoxidization, degassing and deslagging to a casting temperature, adding deoxidization and degassing agent B, discharging from a furnace, casting into a shell mold to obtain a casting, and carrying out heat preservation treatment on the casting;
7) And (3) solidification: after casting is completed, the casting is naturally cooled and solidified, and the CW12MW material of the invention is obtained.
As a preferred technical scheme of the invention, the chemical composition of the CM12MW material is as follows: c is less than or equal to 0.12%; si is less than or equal to 1.0%; mn is less than or equal to 1.0%; p is less than or equal to 0.03%; s is less than or equal to 0.02%; cr:15.5 to 17.5 percent; mo:16.0 to 18.0 percent; fe:4.5 to 7.5 percent; v:0.2 to 0.4 percent; w:3.75 to 5.25 percent; the balance being Ni.
As a preferable technical scheme of the invention, the shielding gas is argon, argon is input at the bottom and the top of the intermediate frequency furnace, and the flow rate of the argon is 10-15 lpm.
As a preferable technical scheme of the invention, the smelting temperature in the 4) is 1600-1700 ℃ and the smelting time is 0.5-1 h.
As a preferable technical scheme of the invention, the deoxidizing and degassing agent A in the 5) is made of rare earth ferrosilicon alloy and FeCrN 8 And Si-Ca-Mn, the rare earth ferrosilicon alloy and FeCrN 8 And the mass ratio of the Si to the Ca to the Mn is 5:1:1-3:1:1, and the deoxidization and the degassing time is 0.2-0.5 h.
As a preferable technical scheme of the invention, the temperature during pouring of the 6) is 1500-1580 ℃ and the pouring time is 0.2-0.5 h;
as a preferable technical scheme of the invention, the agent B of the 6) deoxidizing and degassing agent consists of FeTi30-A and FeV40-A, wherein the mass ratio of the FeTi30-A to the FeV40-A is 10:3-5:3, the heat preservation temperature of the casting is 450-500 ℃, and the heat preservation time is 4-6 hours.
Rare earth ferrosilicon is commonly used in ferrous metallurgy and alloy production, and can improve the hardness, toughness and magnetic property of steel; feCrN 8 Has high hardness, high magnetic permeability and good wear resistance, and is commonly used forHard alloys, magnetic materials, and the like; feTi30-A has excellent corrosion resistance, high strength and low density, and is widely applied to the fields of aerospace, automobile manufacturing, chemical industry and the like; feV40-A ferrovanadium alloy has excellent heat stability, high strength and corrosion resistance, and is commonly used in the fields of ferrous metallurgy, battery materials, chemical industry and the like. Besides the excellent performance which can be provided for castings, the alloy materials can continuously generate a large amount of oxidation reaction in a molten state, including reaction with oxygen to generate oxides, so that the removal of gases such as oxygen and the like in the smelted materials of the CW12MW material is facilitated, the quality of the alloy castings is improved, and the excellent performance of the CW12MW material is ensured.
As a preferable technical scheme of the invention, in the shell making process, after the coating of the first surface layer is completed, the first surface layer is dried for 10-14 hours at normal temperature, and then the second surface layer is coated.
As a preferable technical scheme of the invention, the CW12MW material is prepared by the preparation method.
An application of a CW12MW material, wherein the CW12MW material can be applied to the fields of aerospace, pharmaceutical chemistry, petrochemical engineering and anti-corrosion materials of marine vessels.
The invention has the beneficial effects that:
according to the CW12MW material casting and smelting process provided by the invention, firstly, the deoxidizing and degassing agent A is added in the melting stage and the deoxidizing and degassing agent B is added in the pouring stage, so that the problem that air holes are generated on the surface of a casting due to impurity gas residues is excellently improved; meanwhile, after casting, the casting is subjected to medium-temperature heat preservation treatment to obtain finer crystals, so that the surface of the casting is smoother, and the strength and hardness of the casting are also improved; in the shell making process, the coating of two layers is beneficial to the surface fineness of the casting and also increases the overall toughness of the casting. The invention improves the surface quality of the casting surface, reduces the production cost of small-quantity multi-batch production, has higher economic value and has wide market.
Detailed Description
In order to further describe the technical means and effects adopted by the present invention for achieving the intended purpose, the following detailed description is given below with reference to the embodiments, structures, features and effects according to the present invention.
Example 1
A casting and smelting process for CW12MW materials comprises the following specific steps:
1) And (3) shell manufacturing: coating two layers of surface layers on a wax mould to obtain a wax-containing shell mould, wherein the raw materials for coating the two layers of surface layers are the same, and black lead powder and zirconium sand are added into the raw materials;
2) Shell mold cleaning: dewaxing a wax-containing shell mold, cleaning the inner surface of the shell mold with hot water, and drying to obtain a shell mold with no residues in the inner cavity;
3) Smelting raw material preparation: preparing materials according to chemical components of the CM12MW material and baking;
4) Smelting: introducing protective gas into the intermediate frequency furnace, adding limestone, adding chemical components of the CM12MW material into the intermediate frequency furnace, and heating and smelting;
5) Deoxidizing and degassing: after all chemical components of the CM12MW material are melted, adding a deoxidizing and degassing agent A into the chemical components of the melted CM12MW material to deoxidize and degas, and deslagging to obtain alloy liquid after deoxidizing, degassing and deslagging;
6) Pouring: cooling the alloy liquid subjected to deoxidization, degassing and deslagging to a casting temperature, adding deoxidization and degassing agent B, discharging from a furnace, casting into a shell mold to obtain a casting, and carrying out heat preservation treatment on the casting;
7) And (3) solidification: after casting is completed, the casting is naturally cooled and solidified, and the CW12MW material of the invention is obtained.
The chemical composition of the CM12MW material is as follows: c:0.12%; si:0.95%; mn:1.0%; p:0.03%; s:0.02%; cr:17.5%; mo:17.0%; fe:6.5%; v:0.3%; w:4.25%; the balance being Ni.
The shielding gas is argon, argon is input to the bottom and the top of the intermediate frequency furnace, and the flow rate of the argon is 12lpm.
The smelting temperature in the step 4) is 1650 ℃ and the smelting time is 1h.
The deoxidizing and degassing agent A in the 5) is prepared from rare earth ferrosilicon alloy and FeCrN 8 And Si-Ca-Mn, said rare earth SiIron alloy, feCrN 8 And the mass ratio of Si to Ca to Mn is 4:1:1, and the deoxidization and degassing time is 0.5h.
The temperature during pouring in the step 6) is 1580 ℃, and the pouring time is 0.3h;
the 6) deoxidizing and degassing agent B consists of FeTi30-A and FeV40-A, wherein the mass ratio of the FeTi30-A to the FeV40-A is 8:3, and the heat preservation temperature of the casting is 480 ℃ and the heat preservation time is 4 hours.
And in the shell manufacturing process, after the coating of the first surface layer is finished, drying for 12 hours at normal temperature, and then coating the second surface layer.
A CW12MW material prepared by the above method.
An application of a CW12MW material, wherein the CW12MW material is applied to the field of corrosion resistant materials of marine vessels.
Example 2
A casting and smelting process for CW12MW materials comprises the following specific steps:
1) And (3) shell manufacturing: coating two layers of surface layers on a wax mould to obtain a wax-containing shell mould, wherein the raw materials for coating the two layers of surface layers are the same, and black lead powder and zirconium sand are added into the raw materials;
2) Shell mold cleaning: dewaxing a wax-containing shell mold, cleaning the inner surface of the shell mold with hot water, and drying to obtain a shell mold with no residues in the inner cavity;
3) Smelting raw material preparation: preparing materials according to chemical components of the CM12MW material and baking;
4) Smelting: introducing protective gas into the intermediate frequency furnace, adding limestone, adding chemical components of the CM12MW material into the intermediate frequency furnace, and heating and smelting;
5) Deoxidizing and degassing: after all chemical components of the CM12MW material are melted, adding a deoxidizing and degassing agent A into the chemical components of the melted CM12MW material to deoxidize and degas, and deslagging to obtain alloy liquid after deoxidizing, degassing and deslagging;
6) Pouring: cooling the alloy liquid subjected to deoxidization, degassing and deslagging to a casting temperature, adding deoxidization and degassing agent B, discharging from a furnace, casting into a shell mold to obtain a casting, and carrying out heat preservation treatment on the casting;
7) And (3) solidification: after casting is completed, the casting is naturally cooled and solidified, and the CW12MW material of the invention is obtained.
The chemical composition of the CM12MW material is as follows: c:0.11%; si:1.0%; mn:1.0%; p:0.02%; s:0.02%; cr:17.5%; mo:17.0%; fe:6.5%; v:0.2%; w:4.75%; the balance being Ni.
The shielding gas is argon, argon is input to the bottom and the top of the intermediate frequency furnace, and the flow rate of the argon is 15lpm.
The smelting temperature in the step 4) is 1700 ℃, and the smelting time is 0.5h.
The deoxidizing and degassing agent A in the 5) is prepared from rare earth ferrosilicon alloy and FeCrN 8 And Si-Ca-Mn, the rare earth ferrosilicon alloy and FeCrN 8 And the mass ratio of Si to Ca to Mn is 3:1:1, and the deoxidization and degassing time is 0.2h.
The temperature during pouring in the step 6) is 1580 ℃, and the pouring time is 0.2h;
the 6) deoxidizing and degassing agent B consists of FeTi30-A and FeV40-A, wherein the mass ratio of the FeTi30-A to the FeV40-A is 7:3, and the heat preservation temperature of the casting is 450 ℃ and the heat preservation time is 4 hours.
And in the shell manufacturing process, after the coating of the first surface layer is finished, drying for 12 hours at normal temperature, and then coating the second surface layer.
A CW12MW material prepared by the above method.
Use of a CW12MW material, the CW12MW material being applicable to a corrosion resistant material of a marine vessel.
Example 3
A casting and smelting process for CW12MW materials comprises the following specific steps:
1) And (3) shell manufacturing: coating two layers of surface layers on a wax mould to obtain a wax-containing shell mould, wherein the coating two layers of surface layers are the same in raw materials, and carbon powder and zirconium sand are added into the raw materials;
2) Shell mold cleaning: dewaxing a wax-containing shell mold, cleaning the inner surface of the shell mold with hot water, and drying to obtain a shell mold with no residues in the inner cavity;
3) Smelting raw material preparation: preparing materials according to chemical components of the CM12MW material and baking;
4) Smelting: introducing protective gas into the intermediate frequency furnace, adding limestone, adding chemical components of the CM12MW material into the intermediate frequency furnace, and heating and smelting;
5) Deoxidizing and degassing: after all chemical components of the CM12MW material are melted, adding a deoxidizing and degassing agent A into the chemical components of the melted CM12MW material to deoxidize and degas, and deslagging to obtain alloy liquid after deoxidizing, degassing and deslagging;
6) Pouring: cooling the alloy liquid subjected to deoxidization, degassing and deslagging to a casting temperature, adding deoxidization and degassing agent B, discharging from a furnace, casting into a shell mold to obtain a casting, and carrying out heat preservation treatment on the casting;
7) And (3) solidification: after casting is completed, the casting is naturally cooled and solidified, and the CW12MW material of the invention is obtained.
The chemical composition of the CM12MW material is as follows: c:0.12%; si:1.0%; mn:1.0%; p:0.03%; s:0.02%; cr:17.5%; mo:16.0%; fe:4.5%; v:0.3%; w:4.75%; the balance being Ni.
The shielding gas is argon, argon is input to the bottom and the top of the smelting furnace, and the flow rate of the argon is 14lpm.
The smelting temperature in the step 4) is 1700 ℃, and the smelting time is 0.8h.
The deoxidizing and degassing agent A in the 5) is prepared from rare earth ferrosilicon alloy and FeCrN 8 And Si-Ca-Mn, the rare earth ferrosilicon alloy and FeCrN 8 And the mass ratio of Si to Ca to Mn is 5:1:1, and the deoxidization and degassing time is 0.2h.
The temperature during pouring of the 6) is 1500 ℃, and the pouring time is 0.2h;
the 6) deoxidizing and degassing agent B consists of FeTi30-A and FeV40-A, wherein the mass ratio of the FeTi30-A to the FeV40-A is 6:3, and the heat preservation temperature of the casting is 500 ℃ and the heat preservation time is 5 hours.
And in the shell manufacturing process, after the coating of the first surface layer is finished, drying for 12 hours at normal temperature, and then coating the second surface layer.
A CW12MW material prepared by the above method.
Use of a CW12MW material for use in a corrosion resistant material of a marine vessel.
Example 4
A casting and smelting process for CW12MW materials comprises the following specific steps:
1) And (3) shell manufacturing: coating two layers of surface layers on a wax mould to obtain a wax-containing shell mould, wherein the raw materials for coating the two layers of surface layers are the same, and black lead powder and zirconium sand are added into the raw materials;
2) Shell mold cleaning: dewaxing a wax-containing shell mold, cleaning the inner surface of the shell mold with hot water, and drying to obtain a shell mold with no residues in the inner cavity;
3) Smelting raw material preparation: preparing materials according to chemical components of the CM12MW material and baking;
4) Smelting: introducing protective gas into the intermediate frequency furnace, adding limestone, adding chemical components of the CM12MW material into the intermediate frequency furnace, and heating and smelting;
5) Deoxidizing and degassing: after all chemical components of the CM12MW material are melted, adding a deoxidizing and degassing agent A into the chemical components of the melted CM12MW material to deoxidize and degas, and deslagging to obtain alloy liquid after deoxidizing, degassing and deslagging;
6) Pouring: cooling the alloy liquid subjected to deoxidization, degassing and deslagging to a casting temperature, adding deoxidization and degassing agent B, discharging from a furnace, casting into a shell mold to obtain a casting, and carrying out heat preservation treatment on the casting;
7) And (3) solidification: after casting is completed, the casting is naturally cooled and solidified, and the CW12MW material of the invention is obtained.
The chemical composition of the CM12MW material is as follows: c:0.10%; si:0.9 percent; mn:1.0%; p:0.03%; s:0.01%; cr:16.5%; mo:17.0%; fe:6.5%; v:0.3%; w:4.25%; the balance being Ni.
The shielding gas is argon, argon is input to the bottom and the top of the intermediate frequency furnace, and the flow rate of the argon is 10lpm.
The smelting temperature in the step 4) is 1700 ℃, and the smelting time is 1h.
The deoxidizing and degassing agent A in the 5) is prepared from rare earth ferrosilicon alloy and FeCrN 8 And Si-Ca-Mn, the rare earth ferrosilicon alloy and FeCrN 8 And the mass ratio of Si to Ca to Mn is 3:1:1, and the deoxidization and degassing time is 0.5h.
The temperature during pouring in the step 6) is 1580 ℃, and the pouring time is 0.3h;
the 6) deoxidizing and degassing agent B consists of FeTi30-A and FeV40-A, wherein the mass ratio of the FeTi30-A to the FeV40-A is 8:3, and the heat preservation temperature of the casting is 450 ℃ and the heat preservation time is 5 hours.
And in the shell manufacturing process, after the coating of the first surface layer is finished, drying for 12 hours at normal temperature, and then coating the second surface layer.
A CW12MW material prepared by the above method.
Use of a CW12MW material for use in a corrosion resistant material of a marine vessel.
Comparative example 1
On the basis of example 1, the casting was not subjected to a heat-insulating treatment at 480℃for 4 hours, but directly cooled after the casting was completed.
Comparative example 2
Based on the embodiment 1, rare earth ferrosilicon alloy and FeCrN in the deoxidizing and degassing agent A 8 Removing and replacing with the silicon-calcium-manganese with equal mass.
Comparative example 3
On the basis of example 1, no deoxidizing getter A was used.
Comparative example 4
On the basis of example 1, no deoxidizing scavenger B was used.
Performance test:
testing of oxygen content in CW12MW materials
Test materials: CW12MW materials obtained in examples 1 to 4 and comparative examples 1 to 4.
The test method comprises the following steps: pulse-infrared absorption measurement, reference is made to the relevant literature (Yan Peng, hu Shaocheng, ma Gongquan, wu Zhenning, huang Xiaofeng. Pulse melting-infrared absorption thermal conduction to measure oxygen nitrogen and hydrogen [ J ]. Metallurgical analysis, 2014,34 (10)) in steel materials, to determine the oxygen content in CW12MW materials.
Test results: 8 batches of samples were assayed according to the method and the results are shown in Table 1.
Table 1 oxygen content in cws 12mw material
| Group of | Average value of oxygen content (%) |
| Example 1 | 0.00115 |
| Example 2 | 0.00121 |
| Example 3 | 0.00123 |
| Example 4 | 0.00119 |
| Comparative example 1 | 0.00145 |
| Comparative example 2 | 0.00164 |
| Comparative example 3 | 0.00197 |
| Comparative example 4 | 0.00182 |
The CW12MW materials of comparative examples 1-4 had higher oxygen content than examples 1-4; therefore, the deoxidizing and degassing agent added into the CW12MW material has excellent deoxidizing and degassing effects, and can improve the quality of alloy casting products.
The present invention is not limited to the above embodiments, but is capable of modification and variation in detail, and other modifications and variations can be made by those skilled in the art without departing from the scope of the present invention.
Claims (8)
1. The preparation method of the CW12MW material product is characterized by comprising the following specific steps:
1) And (3) shell manufacturing: coating two layers of surface layers on a wax mould to obtain a wax-containing shell mould, wherein the raw materials for coating the two layers of surface layers are the same, and any one or more of black lead powder, carbon powder or zirconium sand are added into the raw materials;
2) Shell mold cleaning: dewaxing a wax-containing shell mold, cleaning the inner surface of the shell mold with hot water, and drying to obtain a shell mold with no residues in the inner cavity;
3) Smelting raw material preparation: preparing materials according to chemical components of the CM12MW material and baking;
4) Smelting: introducing protective gas into the intermediate frequency furnace, adding limestone, adding chemical components of the baked CM12MW material into the intermediate frequency furnace, and heating and smelting;
5) Deoxidizing and degassing: after all chemical components of the CM12MW material are melted, adding a deoxidizing and degassing agent A into the chemical components of the melted CM12MW material to deoxidize and degas, and deslagging to obtain alloy liquid after deoxidizing, degassing and deslagging;
6) Pouring: cooling the alloy liquid subjected to deoxidization, degassing and deslagging to a casting temperature, adding deoxidization and degassing agent B, discharging from a furnace, casting into a shell mold to obtain a casting, and carrying out heat preservation treatment on the casting;
7) And (3) solidification: after casting is completed, naturally cooling and solidifying the casting to obtain the CW12MW material;
the 5)The medium deoxidizing and degassing agent A is made of rare earth ferrosilicon alloy and FeCrN 8 And Si-Ca-Mn, the rare earth ferrosilicon alloy and FeCrN 8 The mass ratio of the Si to the Ca to the Mn is 5:1:1-3:1:1, and the deoxidization and degassing time is 0.2-0.5 h;
the 6) deoxidizing and degassing agent B consists of FeTi30-A and FeV40-A, wherein the mass ratio of the FeTi30-A to the FeV40-A is 10:3-5:3, the heat preservation temperature of the casting is 450-500 ℃, and the heat preservation time is 4-6 hours.
2. The method for preparing a CW12MW material product according to claim 1, wherein the CM12MW material is composed of the following chemical components: c is less than or equal to 0.12%; si is less than or equal to 1.0%; mn is less than or equal to 1.0%; p is less than or equal to 0.03%; s is less than or equal to 0.02%; cr: 15.5-17.5%; mo: 16.0-18.0%; fe: 4.5-7.5%; v: 0.2-0.4%; w: 3.75-5.25%; the balance being Ni.
3. The preparation method of the CW12MW material product of claim 1, wherein the shielding gas is argon, argon is input to the bottom and the top of the intermediate frequency furnace, and the flow rate of the argon is 10-15 lpm.
4. The method for preparing the CW12MW material product of claim 1, wherein the melting temperature in the 4) is 1600-1700 ℃ and the melting time is 0.5-1 h.
5. The method for preparing the CW12MW material product according to claim 1, wherein the temperature of the casting of the 6) is 1500-1580 ℃ and the casting time is 0.2-0.5 h.
6. The method for preparing the CW12MW material product according to claim 1, wherein the shell-making process is characterized in that after the coating of the first surface layer is completed, the first surface layer is dried for 10-14 hours at normal temperature, and then the second surface layer is coated.
7. A CW12MW material product according to any one of claims 1 to 6.
8. Use of a CW12MW material product according to claim 7, for applications in the field of anti-corrosion materials for aerospace, pharmaceutical, petrochemical or marine vessels.
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| CN101787414A (en) * | 2010-04-07 | 2010-07-28 | 曹承 | Complex deoxidizer for steelmaking and preparation method thereof |
| CN104439070A (en) * | 2014-11-21 | 2015-03-25 | 柳州金特机械有限公司 | Precision casting smelting and roasting process |
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| CN112981094A (en) * | 2019-12-13 | 2021-06-18 | 商丘市商鼎耐火材料有限公司 | Ferrosilicon composite ball for steelmaking and preparation method thereof |
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| CN101787414A (en) * | 2010-04-07 | 2010-07-28 | 曹承 | Complex deoxidizer for steelmaking and preparation method thereof |
| CN104439070A (en) * | 2014-11-21 | 2015-03-25 | 柳州金特机械有限公司 | Precision casting smelting and roasting process |
| CN108080608A (en) * | 2017-12-05 | 2018-05-29 | 安徽应流集团霍山铸造有限公司 | A kind of method for solving Hastelloy cast(ing) surface crackle |
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