CN117165742A - Alloy steel smelting method based on intermediate frequency furnace hydrogen control process - Google Patents
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- 238000000034 method Methods 0.000 title claims abstract description 52
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 50
- 239000001257 hydrogen Substances 0.000 title claims abstract description 50
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 50
- 229910000851 Alloy steel Inorganic materials 0.000 title claims abstract description 41
- 238000003723 Smelting Methods 0.000 title claims abstract description 35
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 58
- 239000010959 steel Substances 0.000 claims abstract description 58
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 36
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 26
- 239000000956 alloy Substances 0.000 claims abstract description 26
- 238000010438 heat treatment Methods 0.000 claims abstract description 24
- 239000004615 ingredient Substances 0.000 claims abstract description 21
- 239000011261 inert gas Substances 0.000 claims abstract description 19
- 229910021536 Zeolite Inorganic materials 0.000 claims abstract description 18
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000010457 zeolite Substances 0.000 claims abstract description 18
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 17
- 238000002156 mixing Methods 0.000 claims abstract description 7
- 238000007599 discharging Methods 0.000 claims abstract description 6
- 238000009740 moulding (composite fabrication) Methods 0.000 claims abstract description 6
- 238000010791 quenching Methods 0.000 claims abstract description 6
- 230000000171 quenching effect Effects 0.000 claims abstract description 6
- 238000005496 tempering Methods 0.000 claims abstract description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 10
- -1 silicon-aluminum-barium-calcium-iron Chemical compound 0.000 claims description 7
- 229910052804 chromium Inorganic materials 0.000 claims description 4
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 4
- 239000001307 helium Substances 0.000 claims description 4
- 229910052734 helium Inorganic materials 0.000 claims description 4
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 4
- 229910052750 molybdenum Inorganic materials 0.000 claims description 4
- 229910052759 nickel Inorganic materials 0.000 claims description 4
- 229910052710 silicon Inorganic materials 0.000 claims description 4
- 239000005997 Calcium carbide Substances 0.000 claims description 3
- 239000007789 gas Substances 0.000 claims description 3
- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 229910052729 chemical element Inorganic materials 0.000 claims description 2
- 229910052748 manganese Inorganic materials 0.000 claims description 2
- 229910052698 phosphorus Inorganic materials 0.000 claims description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 2
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 2
- 229910052717 sulfur Inorganic materials 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 abstract description 2
- 239000002184 metal Substances 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 15
- 239000002994 raw material Substances 0.000 description 10
- 239000005909 Kieselgur Substances 0.000 description 5
- 238000005266 casting Methods 0.000 description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 5
- 229910052757 nitrogen Inorganic materials 0.000 description 5
- 229910052742 iron Inorganic materials 0.000 description 4
- 238000007670 refining Methods 0.000 description 4
- 238000009849 vacuum degassing Methods 0.000 description 4
- 239000011651 chromium Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 238000006356 dehydrogenation reaction Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 238000009628 steelmaking Methods 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 2
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 2
- 229910052788 barium Inorganic materials 0.000 description 2
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 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 2
- 239000011733 molybdenum Substances 0.000 description 2
- 229910052625 palygorskite Inorganic materials 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 238000009864 tensile test Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
-
- 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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- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention relates to the technical field of alloy steel smelting control processes, and provides an alloy steel smelting method based on an intermediate frequency furnace hydrogen control process, which comprises the following steps of: step 1, mixing a pretreatment agent, scrap steel and alloy to obtain ingredients; step 2, baking the ingredients, and removing the pretreatment agent to obtain pretreated ingredients; step 3, adding the pretreatment ingredients into an intermediate frequency furnace, heating, and simultaneously introducing inert gas to obtain molten steel; step 4, adjusting the proportion of each element in the molten steel, increasing the flow rate of inert gas, heating to 1600-1700 ℃, adding deoxidizer for deoxidization, and discharging; step 5, pouring, forming, quenching and tempering to obtain alloy steel; the pretreatment agent comprises one or more of zeolite and diatomite. By the technical scheme, the problem of high hydrogen content in smelting metal in the prior art is solved.
Description
Technical Field
The invention relates to the technical field of alloy steel smelting control processes, in particular to an alloy steel smelting method based on an intermediate frequency furnace hydrogen control process.
Background
The common means in electric furnace steelmaking are oxygen refining in steel, white slag generation in the furnace and the like, however, harmful gas in the steel is an important cause for the performance of the steel not reaching standards, and the removal of the harmful gas is an important task in steelmaking. Particularly, when the hydrogen content in the steel is large, voids or general porosity is liable to occur, and the porosity due to such hydrogen causes embrittlement of iron, thereby lowering the strength of the steel. The hydrogen is carried in the process of smelting alloy steel mainly in two aspects, namely, the raw material is carried in, and the molten steel absorbs hydrogen from air in the smelting process.
Currently, in order to reduce the hydrogen carried-in of the raw material itself, the raw material is generally baked, and hydrogen in the raw material is separated out by baking. Although hydrogen in the raw material can be reduced, a hydrogen layer is formed on the surface of the raw material in the baking process, so that the hydrogen concentration on the surface of the raw material is larger than that in the raw material, the precipitation of hydrogen in the raw material is hindered, and the hydrogen in the raw material cannot be well precipitated. In order to reduce absorption of hydrogen from air in the molten steel in the smelting process, vacuum dehydrogenation treatment is generally performed in the smelting process to reduce the hydrogen content in the molten steel. However, the intermediate frequency furnace steelmaking can only be used for melting steel, cannot be refined, cannot be subjected to vacuum degassing and the like, so that the hydrogen content of molten steel in the intermediate frequency furnace smelting process is high. The intermediate frequency furnace is generally used for melting steel, then an LF furnace is used for refining, and the hydrogen content in the molten steel reaches the specified standard through vacuum dehydrogenation.
The Chinese patent document with publication number of CN 113444983A and publication date of 2021, 09 and 28 discloses a corrosion-resistant and weather-resistant gear ring for a gear box coupler and a preparation method thereof, wherein the method comprises the following steps: firstly, melting scrap iron, scrap steel and scrap alloy steel in an intermediate frequency furnace for component primary mixing, then transferring the melted base material into an LF furnace for deoxidation and desulfurization treatment, adjusting the component proportion, refining to obtain mixed material liquid, injecting the refined mixed material liquid into a mould for vacuum degassing casting, and obtaining a billet after casting is completed.
The patent document discloses a corrosion-resistant and weather-resistant gear ring for a gear box coupler and a preparation method thereof, wherein an intermediate frequency furnace is used, an LF furnace is used for refining alloy steel, and vacuum degassing casting is performed, so that the aim of dehydrogenation can be achieved, but the smelting cost is high, the smelting steps are more, the control difficulty is high, the gear box coupler belongs to a special steel type, the cost control of small and medium-sized smelting and casting enterprises is not facilitated, and the civil popularization is difficult.
The invention is used for smelting alloy steel by adding the pretreatment agent for baking and inert gas protection, can lead the hydrogen content of molten steel to reach the quality level of a vacuum degassing furnace, has simple working procedure and low cost, and is an important way for providing high-quality products for small and medium furnace type smelting and casting enterprises.
Disclosure of Invention
The invention provides an alloy steel smelting method based on a medium frequency furnace hydrogen control process, which solves the problem of higher hydrogen content in metal smelted by a medium frequency furnace in the related technology.
The invention provides an alloy steel smelting method based on a medium frequency furnace hydrogen control process, which comprises the following steps of:
step 1, mixing a pretreatment agent, scrap steel and alloy to obtain ingredients;
step 2, baking the ingredients, and removing the pretreatment agent to obtain pretreated ingredients;
step 3, adding the pretreatment ingredients into an intermediate frequency furnace, heating, and simultaneously introducing inert gas to obtain molten steel;
step 4, adjusting the proportion of each element in the molten steel, increasing the flow rate of inert gas, heating to 1600-1700 ℃, adding deoxidizer for deoxidization, and discharging;
step 5, pouring, forming, quenching and tempering to obtain alloy steel;
the pretreatment agent comprises one or more of zeolite and diatomite.
As a further technical scheme, the prepared alloy steel comprises the following chemical elements in percentage by mass: 0.20 to 0.40 percent of C, 0.30 to 0.90 percent of Si, 0.60 to 1.50 percent of Mn, less than or equal to 0.03 percent of P, less than or equal to 0.03 percent of S, 0.30 to 0.90 percent of Cr, 0.20 to 0.50 percent of Ni, 0.25 to 0.45 percent of Mo and the balance of Fe.
As a further technical scheme, the pretreatment agent consists of zeolite and diatomite, wherein the mass ratio of the zeolite to the diatomite is 1:1-3.
As a further technical scheme, the mass ratio of zeolite to diatomite in the pretreatment agent is 1:2.
As a further technical scheme, the alloy is an alloy containing silicon, manganese, chromium, nickel and molybdenum.
As a further technical scheme, the pretreatment agent is 0.1% -0.5% of the sum of the mass of the scrap steel and the alloy.
As a further technical scheme, the baking temperature in the step 2 is 400-600 ℃, and the baking time is 2-5h.
As a further technical scheme, in the step 3, the temperature is raised to 1100-1200 ℃ at a temperature raising speed of 10 ℃/min, and after preheating, the temperature is raised to 1300-1500 ℃ at a temperature raising speed of 30 ℃/min.
As a further technical scheme, the inert gas is one of nitrogen or helium.
As a further technical scheme, the flow rate of the inert gas in the step 3 is 1-2L/min.
As a further technical scheme, the flow rate of the inert gas in the step 4 is 3-4L/min.
As a further technical scheme, the deoxidizer in the step 4 comprises one or more of silicon-aluminum-barium-calcium-iron, aluminum wires, aluminum-manganese-iron, calcium carbide and silicon carbide.
As a further technical scheme, the amount of the deoxidizer in the step 4 is 0.5% -1% of the sum of the mass of the scrap steel and the mass of the alloy.
The working principle and the beneficial effects of the invention are as follows:
1. according to the invention, zeolite and diatomite are used as pretreatment agents, and the pretreatment agents are used for adsorbing hydrogen on the surfaces of the steel scraps and the alloy when the steel scraps and the alloy are baked, so that the concentration of the hydrogen on the surfaces of the steel scraps and the alloy is reduced, and the concentration difference is formed between the inner parts and the surfaces of the steel scraps and the alloy, so that the hydrogen in the steel scraps and the alloy can be fully separated out, the hydrogen content in molten steel in the smelting process is reduced, and the yield strength, the tensile strength and the elongation of the alloy steel are improved.
2. In the smelting process, the inert gas is used, so that molten steel cannot contact with the atmosphere in the smelting process, and only contacts with the inert gas to form atmosphere isolation, so that the influence of moisture in the air on the hydrogen content of the molten steel is isolated, the hydrogen content in the alloy steel is reduced, and the yield strength, the tensile strength and the elongation of the alloy steel are enhanced.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
The alloy steel smelting method based on the intermediate frequency furnace hydrogen control process comprises the following steps:
step 1, mixing a pretreatment agent, scrap steel and alloy to obtain a mixture, wherein the pretreatment agent consists of zeolite and diatomite in a mass ratio of 1:2, and the pretreatment agent is 0.3% of the sum of the mass of the scrap steel and the mass of the alloy;
step 2, baking the ingredients at 500 ℃ for 3 hours, cooling and removing surface powder to obtain pretreated ingredients;
step 3, adding the pretreatment ingredients into an intermediate frequency furnace, introducing low current into the intermediate frequency furnace, heating to 1150 ℃ at a heating rate of 10 ℃/min, preheating, introducing full-load current, heating to 1400 ℃ at a heating rate of 30 ℃/min, and introducing nitrogen with a flow rate of 1.5L/min while heating to obtain molten steel;
step 4, adjusting the proportion of each element in molten steel by adding an alloy containing silicon, manganese, chromium, nickel and molybdenum, after the content of each element in the alloy steel reaches a set proportion, increasing the flow rate of nitrogen to 3.5L/min, heating to 1650 ℃, adding silicon-aluminum-barium-calcium-iron for deoxidization, and discharging, wherein the mass of the silicon-aluminum-barium-calcium-iron is 0.8% of the sum of the mass of the scrap steel and the alloy;
and 5, pouring, forming, quenching and tempering to obtain the rod-shaped alloy steel with the diameter of 30 mm.
Example 2
The alloy steel smelting method based on the intermediate frequency furnace hydrogen control process comprises the following steps:
step 1, mixing a pretreatment agent, scrap steel and alloy to obtain a mixture, wherein the pretreatment agent consists of zeolite and diatomite in a mass ratio of 1:1, and the pretreatment agent is 0.1% of the sum of the mass of the scrap steel and the alloy;
step 2, baking the ingredients at 400 ℃ for 5 hours, cooling and removing surface powder to obtain pretreated ingredients;
step 3, adding the pretreatment ingredients into an intermediate frequency furnace, introducing low current into the intermediate frequency furnace, heating to 1100 ℃ at a heating rate of 10 ℃/min, preheating, introducing full-load current, heating to 1300 ℃ at a heating rate of 30 ℃/min, and obtaining molten steel, wherein nitrogen with a flow rate of 1L/min is introduced while heating;
step 4, adjusting the proportion of each element in molten steel, increasing the flow rate of nitrogen to 3L/min, heating to 1600 ℃, adding silicon-aluminum-barium-calcium-iron for deoxidization, and discharging, wherein the mass of the calcium carbide is 0.5% of the sum of the mass of the scrap steel and the alloy;
and 5, pouring, forming, quenching and tempering to obtain the rod-shaped alloy steel with the diameter of 30 mm.
Example 3
The alloy steel smelting method based on the intermediate frequency furnace hydrogen control process comprises the following steps:
step 1, mixing a pretreatment agent, scrap steel and alloy to obtain a mixture, wherein the pretreatment agent consists of zeolite and diatomite in a mass ratio of 1:3, and the pretreatment agent is 0.5% of the sum of the mass of the scrap steel and the mass of the alloy;
step 2, baking the ingredients at 600 ℃ for 2 hours, cooling and removing surface powder to obtain pretreated ingredients;
step 3, adding the pretreatment ingredients into an intermediate frequency furnace, introducing low current into the intermediate frequency furnace, heating to 1200 ℃ at a heating rate of 10 ℃/min, preheating, introducing full-load current, heating to 1500 ℃ at a heating rate of 30 ℃/min, and introducing helium with a flow rate of 2L/min while heating to obtain molten steel;
step 4, adjusting the proportion of each element in molten steel, increasing the flow rate of helium to 4L/min, heating to 1700 ℃, adding silicon aluminum, barium, calcium and iron for deoxidization, and discharging, wherein the mass of the silicon aluminum, barium, calcium and iron is 1% of the sum of the mass of scrap steel and alloy;
and 5, pouring, forming, quenching and tempering to obtain the rod-shaped alloy steel with the diameter of 30 mm.
Example 4
This example differs from example 1 only in that no zeolite was added to the pretreatment.
Example 5
This example differs from example 1 only in that no diatomaceous earth was added to the pretreatment agent.
Example 6
This example differs from example 1 only in that the mass ratio of zeolite to diatomaceous earth in the pretreatment agent is 1:1.
Example 7
This example differs from example 1 only in that the mass ratio of zeolite to diatomaceous earth in the pretreatment agent is 1:3.
Example 8
This example differs from example 1 only in that the zeolite in the pretreatment is replaced with an equal amount of palygorskite.
Comparative example 1
The comparative example differs from example 1 only in that no pretreatment agent was added.
Comparative example 2
The comparative example differs from example 1 only in that the addition amount of the pretreatment agent was 0.6%.
Comparative example 3
This comparative example differs from example 1 only in that no nitrogen gas was introduced.
The hydrogen content of the molten steel in examples 1 to 8 and comparative examples 1 to 3 was measured using a Heraeus Electro-state hydrogen meter, and the results are shown in table 1.
Tensile mechanical properties: the alloy steels obtained in examples 1 to 8 and comparative examples 1 to 3 were subjected to the first part of the metallic material tensile test according to GB/T228.1-2010: room temperature test methods room temperature quasi-static tensile tests were performed with yield strength, tensile strength and elongation as shown in table 2.
Table 1: detection result of hydrogen content in molten steel
As can be seen from Table 1, after examples 1 to 8 were protected with the pretreatment agent and the inert gas, the hydrogen content of the molten steel reached the primary standard, and comparative examples 1 to 3 were not protected with the pretreatment agent and the inert gas according to the technical scheme of the present invention, and the hydrogen content of the molten steel was the secondary standard. Compared with the example 1, the pretreatment agent is not added in the comparative example 1, the addition amount of the pretreatment agent in the comparative example 2 is 0.6%, the inert gas is not introduced in the comparative example 3, the data are comprehensively analyzed, and the effect of adding the pretreatment agent and the inert gas protection on removing the hydrogen content in the molten steel is obvious according to the technical scheme of the invention, so that the hydrogen content in the molten steel can be effectively reduced.
Table 2: alloy steel normal temperature performance requirement detection result
In comparison with example 1, example 4 was free of zeolite, example 5 was free of diatomaceous earth, example 8 was substituted for equal amounts of palygorskite, and comparative example 1 was free of pretreatment, and as a result, the alloy steels in examples 4 to 5, example 8 and comparative example 1 were lower in yield strength, tensile strength and elongation than example 1, indicating that the pretreatment of scrap steel and alloy with the addition of zeolite and diatomaceous earth at the same time improved the yield strength, tensile strength and elongation of the alloy steel.
In comparison with example 1, comparative example 3 was free from nitrogen gas, and as a result, the alloy steel had lower yield strength, tensile strength and elongation than those of example 1, indicating that nitrogen gas was introduced to improve the yield strength, tensile strength and elongation of the alloy steel.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (10)
1. The alloy steel smelting method based on the intermediate frequency furnace hydrogen control process is characterized by comprising the following steps of:
step 1, mixing a pretreatment agent, scrap steel and alloy to obtain ingredients;
step 2, baking the ingredients, and removing the pretreatment agent to obtain pretreated ingredients;
step 3, adding the pretreatment ingredients into an intermediate frequency furnace, heating, and simultaneously introducing inert gas to obtain molten steel;
step 4, adjusting the proportion of each element in the molten steel, increasing the flow rate of inert gas, heating to 1600-1700 ℃, adding deoxidizer for deoxidization, and discharging;
step 5, pouring, forming, quenching and tempering to obtain alloy steel;
the pretreatment agent comprises one or more of zeolite and diatomite.
2. The alloy steel smelting method based on the intermediate frequency furnace hydrogen control process according to claim 1, wherein the alloy steel prepared by the method comprises the following chemical elements in percentage by mass: 0.20 to 0.40 percent of C, 0.30 to 0.90 percent of Si, 0.60 to 1.50 percent of Mn, less than or equal to 0.03 percent of P, less than or equal to 0.03 percent of S, 0.30 to 0.90 percent of Cr, 0.20 to 0.50 percent of Ni, 0.25 to 0.45 percent of Mo and the balance of Fe.
3. The alloy steel smelting method based on the intermediate frequency furnace hydrogen control process according to claim 1, wherein the pretreatment agent consists of zeolite and diatomite, and the mass ratio of the zeolite to the diatomite is 1:1-3.
4. The alloy steel smelting method based on the intermediate frequency furnace hydrogen control process according to claim 3, wherein the pretreatment agent is 0.5% -1% of the sum of the mass of scrap steel and alloy.
5. The alloy steel smelting method based on the intermediate frequency furnace hydrogen control process according to claim 1, wherein the baking temperature in the step 2 is 400-600 ℃, and the baking time is 2-5h.
6. The method for smelting alloy steel based on the intermediate frequency furnace hydrogen control process according to claim 1, wherein the temperature is raised to 1100-1200 ℃ at a temperature raising rate of 10 ℃/min in the step 3, and raised to 1300-1500 ℃ at a temperature raising rate of 30 ℃/min after preheating.
7. The alloy steel smelting method based on the intermediate frequency furnace hydrogen control process according to claim 1, wherein the inert gas is one of nitrogen gas and helium gas.
8. The alloy steel smelting method based on the intermediate frequency furnace hydrogen control process according to claim 1, wherein the flow rate of the inert gas in the step 3 is 1-2L/min.
9. The alloy steel smelting method based on the intermediate frequency furnace hydrogen control process according to claim 1, wherein the flow rate of the inert gas in the step 4 is 3-4L/min.
10. The alloy steel smelting method based on the intermediate frequency furnace hydrogen control process according to claim 1, wherein the deoxidizer in the step 4 comprises one or more of silicon-aluminum-barium-calcium-iron, aluminum wire, aluminum-manganese-iron, calcium carbide and silicon carbide.
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