CN109880991B - Heat treatment production process of high-corrosion-resistance wear-resistance converter primary dust removal fan impeller - Google Patents
Heat treatment production process of high-corrosion-resistance wear-resistance converter primary dust removal fan impeller Download PDFInfo
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Abstract
The invention discloses a heat treatment production process of a primary dust removal fan impeller of a high-corrosion-resistance wear-resistance converter, which comprises the following steps: (1) fixing a wheel disc or a cover disc to be subjected to heat treatment with a high-temperature anti-deformation tire, and then hoisting the wheel disc or the cover disc into a special heat treatment process furnace, wherein the special heat treatment process furnace automatically completes solid solution and overaging treatment; (2) after the blades and the high-temperature anti-deformation tire are fixed, hoisting the blades into a special heat treatment process furnace, and automatically completing solid solution and overaging treatment by the special heat treatment process furnace; (3) and (3) respectively welding the wheel disc and the cover disc processed in the step (1) with the blade processed in the step (2). The production process provided by the invention realizes the high-strength welding effect of stainless steel and stainless steel or alloy steel, and the produced impeller is durable.
Description
Technical Field
The invention relates to the field of environment-friendly dust removal fans, in particular to a heat treatment production process of a primary dust removal fan impeller of a high-corrosion-resistance wear-resistant converter.
Background
In a steelmaking dust removal system, a converter primary dust removal fan is the only core power device, a large amount of converter gas is acted by a fan impeller to enable the gas to flow, and the converter gas is purified, recovered and discharged in the flowing process.
The converter gas consists of CO, CO2, N2, O2, SO2, NOX and water vapor, wherein:
1：NO+O2＝>2NO2↑3NO2+H2O＝2HNO3+NO↑
2: SO2+ H2O → H2SO4 (diluted) H2SO4+ Fe → FeSO4+ H ↓
From the above it can be seen that the presence of NOX, SO2 and water vapour causes the corrosion of the impeller by dilute nitric acid and dilute sulphuric acid.
At present, blades in a primary dedusting fan impeller of a steel converter are generally made of high-strength alloy steel, the material has high strength but does not have an anti-corrosion function, and the impeller has serious wear-through and cracking phenomena due to loss of the material strength caused by strong acid corrosion of a converter gas medium. Therefore, the service life is short (generally scrapped about one year); short online running time (generally, the impeller needs to be stopped and cleaned after running for about 10 days), and the like, thereby seriously influencing the production rhythm.
In the existing examples, only three steelworks of martial steel are taken as examples: before 2005, 2-3 groups of rotors need to be scrapped every year in first steel making. And 3-4 groups of rotors are scrapped every year in Wu-Steel-II steel making. A new rotor 6 set is created in 2004 by Wu Steel three steelmaking. The annual scrapping of steel works is characterized by erosion of the blades in the impeller. The original steel-making fan of the former Yu vanadium-titanium technology limited steelworks is stopped to clean the impeller in less than one month. The following steps are repeated: this is basically true of Hebei Steel works, Hebei New Steel works, Lei Steel permanent Steel works, Shandong Luli Steel works, and the like. A primary dust removal fan of a converter is urgently needed by steel plants in China, the service life of an impeller can be greatly prolonged, and the online operation time of the primary dust removal fan can be greatly prolonged.
The precipitation hardening stainless steel 0Cr14Ni6Mo2Cu2Nb is an acid-resistant stainless steel, and a Cr2O3 protective film (passive film) is generated on the surface of the stainless steel during the operation of the impeller, so that the contact between iron atoms in the steel and an acid medium is isolated, and the acid corrosion resistance effect is achieved.
The precipitation hardening stainless steel has high strength, high hardness and bending strength up to 1050 MPa. The flexural strength (sigma s is 255MPa) of austenitic stainless steel such as 304, 316,1Cr18Ni9Ti and the like is 4 times. Completely meets the condition of making the impeller of the primary dust removal fan of the converter. In a word, under the severe environment conditions with strong corrosion and abrasion, the fan impeller made of the material (0Cr14Ni6Mo2Cu2Nb) can completely achieve the good effects of abrasion resistance and corrosion resistance.
The material difference between the precipitation-hardened stainless steel blade (0Cr14Ni6Mo2Cu2Nb) and the alloy steel (15MnNiCrMo2V) is large. One is stainless steel and the other is alloy steel, welding stress is different, and a weldment is easy to deform or crack. Therefore, the invention provides a brand-new impeller heat treatment production process.
Disclosure of Invention
In order to solve the problems in the background art, the invention aims to provide a heat treatment production process of a primary dedusting fan impeller of a high-corrosion-resistance wear-resistance converter.
In order to achieve the purpose, the invention adopts the technical scheme that:
the invention provides a heat treatment production process of a primary dust removal fan impeller of a high-corrosion-resistance wear-resistance converter, which comprises the following steps:
(1) fixing a wheel disc or a cover disc to be subjected to heat treatment with a high-temperature anti-deformation tire, and then hoisting the wheel disc or the cover disc into a special heat treatment process furnace, wherein the special heat treatment process furnace automatically completes solid solution and overaging treatment;
(2) after the blades and the high-temperature anti-deformation tire are fixed, hoisting the blades into a special heat treatment process furnace, and automatically completing solid solution and overaging treatment by the special heat treatment process furnace;
(3) respectively welding the wheel disc and the cover disc processed in the step (1) with the blade processed in the step (2), and specifically performing the following steps:
(3-1) in the welding process, hoisting the wheel disc processed in the step (1), the blade processed in the step (2) and a welding rod into a special heat treatment process furnace, heating to 150-;
and (3-2) hoisting the impeller prototype obtained in the step (3-1), the cover disc treated in the step (1) and the welding rod into a special heat treatment process furnace, heating to 150-.
Among the above-mentioned technical scheme, the impeller includes rim plate, closing disk and a plurality of blade, the blade includes long blade and short blade, and the impeller adopts double-deck crack formula long, short blade form, welds respectively by blade and rim plate, closing disk and constitutes, just long blade on the impeller is crisscross with short blade and is the concentric circle and arranges.
In the above technical scheme, the solution treatment of the wheel disc or the cover disc in the step (1) is specifically as follows: heating the wheel disc or the cover disc to 850 ℃, then preserving heat for 1h, then continuously heating to 1000-1100 ℃ for solution treatment for 2-5h, and then cooling by air; wherein argon is introduced for protection during the solution treatment;
the overaging treatment of the wheel disc or the cover disc in the step (1) specifically comprises the following steps: and heating the wheel disc or the cover disc subjected to the solution treatment to 500-700 ℃, and carrying out heat preservation for 5-6h and then carrying out air cooling.
In the above technical scheme, the solution treatment of the blades in the step (2) is specifically as follows: heating the blades to 850 ℃, then preserving heat for 1h, then continuously heating to 1000-1100 ℃ for solution treatment for 2-5h, and then cooling with air; wherein argon is introduced for protection during the solution treatment;
the blade overaging treatment in the step (2) is specifically as follows: and heating the blade subjected to the solution treatment to 500-700 ℃, preserving the temperature for 5h, and then cooling the blade by air.
In the technical scheme, the welding stress relief treatment in the step (3-1) and the step (3-2) comprises the following specific steps: and heating the welded workpiece, namely the impeller prototype and the impeller to 500-700 ℃, preserving the heat for 7h, and then cooling the workpiece by air.
In the technical scheme, the blade is made of precipitation hardening stainless steel 0Cr14Ni6Mo2Cu2 Nb; the wheel disc and the cover disc are made of alloy steel 15MnNiCrMo 2V.
In the technical scheme, the blades, the wheel disc and the cover disc are all made of precipitation hardening stainless steel 0Cr14Ni6Mo2Cu2 Nb.
In the technical scheme, the precipitation hardening stainless steel 0Cr14Ni6Mo2Cu2Nb is subjected to forging heat treatment before being polished into a workpiece, specifically, after the precipitation hardening stainless steel 0Cr14Ni6Mo2Cu2Nb is forged, the temperature is kept at 850 ℃ for adjustment for 1h, then the solution treatment is carried out at 1050 ℃ for 2-5h, and then the air cooling is carried out after the overaging treatment is carried out at 640 ℃ for 5-6 h.
In the technical scheme, the materials of the welding rod in the step (3-1) and the step (3-2) meet the following conditions: the alloy elements comprise Cr, Ni and Mo; the elongation is 20-25%; the tensile strength is 800-850 MPa; the hardness is HB 90-96.
Compared with the prior art, the invention has the beneficial effects that:
1. compared with the prior common process welding, the heat treatment process for producing the impeller provided by the invention has the following advantages due to the addition of the innovative process: firstly, the welding strength is high, and test data proves that the strength b of the base metal at the welding seam is more than or equal to 800 MPa. And eliminating internal stress (no post-weld cracking and corner occurrence). And the high-strength welding effect of two different materials of stainless steel and alloy steel is completely realized. The weld parts are durable, and the rotor made of the Wu-Steel in 2005 is still used in 2019 and has been used for 14 years. One rotor never exceeded a year's life cycle before martial steel-making.
2. The impeller produced by the heat treatment process ensures that the blade material in the impeller which is most easily damaged is durable, and the service life of the impeller is prolonged by 5-10 times or more than that of the original impeller. The rotor is equivalent to the use value of 5-10 original rotors. 2 sets of running fans are arranged in each steel plant, each set of rotor is about 40 ten thousand yuan, and about 400-800 ten thousand yuan can be saved for enterprises every year. Meanwhile, the online running time is improved by 2-3 times, namely, the work of stopping, disassembling, cleaning the impeller and performing dynamic balance is reduced by more than 2 times, and the stability of steel making is kept.
3. The blade used in the impeller produced by the process provided by the invention has smooth surface and does not rust, meanwhile, the blade is made of precipitation hardening stainless steel 0Cr14Ni6Mo2Cu2Nb which is acid-resistant stainless steel, and a Cr2O3 protective film (passive film) is generated on the surface of the blade in the working process of the impeller, so that the contact between iron atoms in the steel and an acid medium is isolated, and the acid corrosion resistance effect is achieved. Therefore, the fan impeller can completely achieve good effects of wear resistance and corrosion resistance, and the workload of a steel-making fan maintainer is reduced by about half.
Drawings
FIG. 1 is a schematic structural view of an impeller produced by the present invention;
FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;
description of reference numerals:
1. a wheel disc; 2. a cover plate; 3. a blade; 3-1, long leaves; 3-2, short leaf.
Detailed Description
In order to make the technical means, the creation features, the achievement purposes and the effects of the invention easy to understand, the following description further explains how the invention is implemented by combining the attached drawings and the detailed implementation modes.
The invention provides a heat treatment production process of a primary dust removal fan impeller of a high-corrosion-resistance wear-resistance converter, which comprises the following steps:
(1) fixing a wheel disc or a cover disc to be subjected to heat treatment with a high-temperature anti-deformation tire, and then hoisting the wheel disc or the cover disc into a special heat treatment process furnace, wherein the special heat treatment process furnace automatically completes solid solution and overaging treatment;
(2) after the blades and the high-temperature anti-deformation tire are fixed, hoisting the blades into a special heat treatment process furnace, and automatically completing solid solution and overaging treatment by the special heat treatment process furnace;
(3) respectively welding the wheel disc and the cover disc processed in the step (1) with the blade processed in the step (2), and specifically performing the following steps:
(3-1) in the welding process, hoisting the wheel disc processed in the step (1), the blade processed in the step (2) and a welding rod into a special heat treatment process furnace, heating to 150-;
and (3-2) hoisting the impeller prototype obtained in the step (3-1), the cover disc treated in the step (1) and the welding rod into a special heat treatment process furnace, heating to 150-.
As shown in fig. 1 and 2, in the invention, the impeller comprises a wheel disc 1, a cover disc 2 and a plurality of blades 3, wherein the blades 3 comprise long blades 3-1 and short blades 3-2, the impeller adopts a double-layer crack type long and short blade form and is formed by welding the blades 3 with the wheel disc 1 and the cover disc 2 respectively, and the long blades 3-1 and the short blades 3-2 on the impeller are arranged in a staggered manner of concentric circles.
In the invention, the solution treatment of the wheel disc or the cover disc in the step (1) is specifically as follows: heating the wheel disc or the cover disc to 850 ℃, then preserving heat for 1h, then continuously heating to 1000-1100 ℃ for solution treatment for 2-5h, and then cooling by air; wherein argon is introduced for protection during the solution treatment;
the overaging treatment of the wheel disc or the cover disc in the step (1) specifically comprises the following steps: and heating the wheel disc or the cover disc subjected to the solution treatment to 500-700 ℃, and carrying out heat preservation for 5-6h and then carrying out air cooling.
In the invention, the solution treatment of the blades in the step (2) is specifically as follows: heating the blades to 850 ℃, then preserving heat for 1h, then continuously heating to 1000-1100 ℃ for solution treatment for 2-5h, and then cooling with air; wherein argon is introduced for protection during the solution treatment;
the blade overaging treatment in the step (2) is specifically as follows: and heating the blade subjected to the solution treatment to 500-700 ℃, preserving the temperature for 5h, and then cooling the blade by air.
In the invention, the welding stress relief treatment in the step (3-1) and the step (3-2) comprises the following specific steps: and heating the welded workpiece, namely the impeller prototype and the impeller to 500-700 ℃, preserving the heat for 7h, and then cooling the workpiece by air. The stress relief treatment of welding ensures that no cracking or corner appears after welding.
In the invention, the blade is made of precipitation hardening stainless steel 0Cr14Ni6Mo2Cu2Nb, the tensile strength b is more than or equal to 800MPa, and the precipitation hardening stainless steel 0Cr14Ni6Mo2Cu2Nb is subjected to calcination heat treatment before being processed into a workpiece (blade); the wheel disc and the cover disc are made of alloy steel 15MnNiCrMo2V, and the tensile strength b is more than or equal to 800 MPa. Or the blades, the wheel disc and the cover disc are made of precipitation hardening stainless steel 0Cr14Ni6Mo2Cu2 Nb; precipitation hardening stainless steel 0Cr14Ni6Mo2Cu2Nb was subjected to a calcination heat treatment prior to being processed into workpieces (blades, discs and caps). The forging heat treatment specifically comprises the following steps: forging precipitation hardening stainless steel 0Cr14Ni6Mo2Cu2Nb, keeping the temperature at 850 ℃ for 1h, performing solution treatment at 1050 ℃ for 2-5h, performing overaging treatment at 640 ℃ for 5-6h, and then cooling by air.
In the invention, because the material properties of two steels of precipitation hardening stainless steel and high-strength alloy steel are greatly different, the welding rod is selected firstly:
i) and matching the welding materials with equal strength.
ii) a metallographic structure compatible welding material.
iii) welding the material under suitable heat treatment conditions for the blade.
iv) a welding material which can be machined after welding.
The materials of the welding rod in the step (3-1) and the step (3-2) meet the following conditions: the alloy elements comprise Cr, Ni and Mo; the elongation is 20-25%; the tensile strength is 800-850 MPa; the hardness is HB 90-96.
Example 1
The instrument comprises the following steps: firstly, a set of special heat treatment process furnaces; secondly, one set of high-temperature electric control cabinet (semi-automatic control with alarm); thirdly, high-temperature deformation-resistant tire; fourthly, a special welding bench is used; measuring the temperature of a plurality of primary instruments; all instruments are commercially available.
The blades, the wheel disc and the cover disc are all made of precipitation hardening stainless steel 0Cr14Ni6Mo2Cu2 Nb.
The invention provides a heat treatment production process of a primary dust removal fan impeller of a high-corrosion-resistance wear-resistance converter, which comprises the following steps:
(1) the raw material precipitation hardening stainless steel 0Cr14Ni6Mo2Cu2Nb is processed into a wheel cover, a cover disc and a blade after forging heat treatment; wherein the forging heat treatment specifically comprises the following steps: forging precipitation hardening stainless steel 0Cr14Ni6Mo2Cu2Nb, keeping the temperature at 850 ℃ for 1h, performing solution treatment at 1050 ℃ for 2-5h, performing overaging treatment at 640 ℃ for 5-6h, and then cooling by air.
(2) Fixing the wheel disc or the cover disc obtained in the step (1) with a high-temperature deformation-proof tire, hoisting the wheel disc or the cover disc into a special heat treatment process furnace, automatically heating the wheel disc or the cover disc to 850 ℃, then preserving heat for 1h, then continuously heating to 1000-1100 ℃ for carrying out solution treatment for 2-5h, and then cooling with air;
wherein argon is introduced for protection during the solution treatment; heating the wheel disc or the cover disc subjected to the solution treatment to 500-700 ℃, and carrying out heat preservation for 5-6h and then carrying out air cooling;
(3) fixing the blade obtained in the step (1) with a high-temperature deformation-proof tire, hoisting the blade into a special heat treatment process furnace, automatically heating the blade to 850 ℃ by the special heat treatment process furnace, then preserving heat for 1h, continuously heating to 1000-1100 ℃ for solution treatment for 2-5h, and then cooling by air; wherein argon is introduced for protection during the solution treatment; and heating the blade subjected to the solution treatment to 500-700 ℃, preserving the temperature for 5h, and then cooling the blade by air.
(4) Respectively welding the wheel disc and the cover disc processed in the step (2) with the blade processed in the step (3), and specifically performing the following steps:
(4-1) in the welding process, hoisting the wheel disc processed in the step (2), the blade processed in the step (3) and a welding rod into a special heat treatment process furnace, heating to 200 ℃, keeping the temperature for 2 hours, and continuing to hoist for welding until the wheel disc and the blade form an impeller embryonic form to be processed through the welding rod assembly, and then hoisting into the special heat treatment process furnace for welding stress relief treatment;
and (4-2) hoisting the impeller prototype obtained in the step (4-1), the cover plate treated in the step (2) and the welding rods into a special heat treatment process furnace, heating to 200 ℃, keeping the temperature for 2 hours, continuing to hoist for welding until the impeller prototype and the cover plate are welded into a rough impeller through a welding rod assembly, and then hoisting the impeller into the special heat treatment process furnace for welding stress relief treatment to obtain the impeller.
The welding stress relief treatment comprises the following specific steps: and heating the welded workpiece, namely the impeller prototype and the impeller to 500-700 ℃, preserving the heat for 7h, and then cooling the workpiece by air.
Example 2
The instrument comprises the following steps: firstly, a set of special heat treatment process furnaces are provided. And secondly, one set of high-temperature electric control cabinet (semi-automatic control with alarm). And thirdly, high-temperature deformation-preventing tire. Fourthly, the special welding bench is used. Several primary thermometers are used.
The blade is made of precipitation hardening stainless steel 0Cr14Ni6Mo2Cu2 Nb; the wheel disc and the cover disc are made of alloy steel 15MnNiCrMo 2V.
The invention provides a heat treatment production process of a primary dust removal fan impeller of a high-corrosion-resistance wear-resistance converter, which comprises the following steps:
(1) the alloy steel 15MnNiCrMo2V is calcined and then processed into a wheel cover and a cover disc; the raw material precipitation hardening stainless steel 0Cr14Ni6Mo2Cu2Nb is processed into a blade after forging heat treatment; wherein the forging heat treatment specifically comprises the following steps: forging precipitation hardening stainless steel 0Cr14Ni6Mo2Cu2Nb, keeping the temperature at 850 ℃ for 1h, performing solution treatment at 1050 ℃ for 2-5h, performing overaging treatment at 640 ℃ for 5-6h, and then cooling by air.
(2) Fixing the wheel disc or the cover disc obtained in the step (1) with a high-temperature anti-deformation tire, and then hoisting the wheel disc or the cover disc into a special heat treatment process furnace, wherein the special heat treatment process furnace automatically completes solid solution and overaging treatment;
(3) fixing the blade obtained in the step (1) with a high-temperature anti-deformation mold, hoisting the blade into a special heat treatment process furnace, automatically heating the blade to 850 ℃, then preserving heat for 1h, then continuously heating to 1050 ℃, carrying out solid solution treatment for 2-5h, and then cooling with air; wherein argon is introduced for protection during the solution treatment; and (4) heating the blades subjected to the solution treatment to 640 ℃, preserving the temperature for 5 hours, and then cooling the blades by air.
(4) Respectively welding the wheel disc and the cover disc processed in the step (2) with the blade processed in the step (3), and specifically performing the following steps:
(4-1) in the welding process, hoisting the wheel disc processed in the step (2), the blade processed in the step (3) and a welding rod into a special heat treatment process furnace, heating to 200 ℃, keeping the temperature for 3 hours, and continuing to hoist for welding until the wheel disc and the blade form an impeller embryonic form to be processed through the welding rod assembly, and then hoisting into the special heat treatment process furnace for welding stress relief treatment;
and (4-2) hoisting the impeller prototype obtained in the step (4-1), the cover disc treated in the step (2) and the welding rods into a special heat treatment process furnace, heating to 200 ℃, keeping the temperature for 3 hours, continuing to hoist for welding until the impeller prototype and the cover disc are welded into a rough impeller through a welding rod assembly, and then hoisting the impeller into the special heat treatment process furnace for welding stress relief treatment to obtain the impeller.
In this example, the precipitation-hardened stainless steel blade (0Cr14Ni6Mo2Cu2Nb) and the alloy steel (15MnNiCrMo2V) have a large difference in material quality. One is stainless steel and the other is alloy steel, welding stress is different, and a weldment is easy to deform or crack. The materials of the welding rod in the step (4-1) and the step (4-2) meet the following conditions: the alloy elements comprise Cr, Ni and Mo; the elongation is 20-25%; the tensile strength is 800-850 MPa; the hardness is HB 90-96. The precipitation hardening stainless steel blade (0Cr14Ni6Mo2Cu2Nb) and the alloy steel (15MnNiCrMo2V) both contain alloy elements Cr, Ni and Mo, the alloy elements in the welding rod comprise Cr, Ni and Mo, the welding rod is convenient for the compatibility of the metallographic structure of the stainless steel and the alloy steel, the tensile strength is 800-850 MPa, and the welding rod is matched with the strength of the stainless steel and the alloy steel.
The impeller produced by the heat treatment process provided by the embodiment is subjected to a tensile test for verifying the welding position of the wheel disc or the cover disc and the blade by the Wuhan material and structure test detection center in the China Ship industry: yield strength rp0.2(N/mm2) ═ 863; tensile strength Rm (N/mm2) ═ 958; test data prove that the strength b of the parent metal at the welding seam is more than or equal to 800 MPa.
The application example is as follows:
the use effect case of the impeller produced by the heat treatment process provided by the invention is as follows:
i) before 2005 wu-steel making, two converters had to scrap two sets of rotors each year, and since 2005 we adopted precipitation-hardened stainless steel impellers, the operation was still intact as early as 2019. The impeller is in service for 14 years, and compared with the previous set of rotor which is scrapped after only ten months, the service life of the impeller is prolonged by 14 times.
ii) before 2016, the Yu vanadium-titanium technology company steel works need to shut down to clean the impeller or make dynamic balance when each fan runs for about 10-15 days, and after the reconstructed stainless steel blade rotor is adopted after 2016, the online running time reaches 11 months, and the running time is increased by 12 times.
iii) forty steel mills such as Tianjin iron and steel company, Hunan Tan iron and steel company, and the great east China sea iron and steel company, after adopting the patented product, the service life of the impeller, the online running time, the labor resource saving and the like are greatly improved.
Finally, the above embodiments are only intended to illustrate the technical solution of the present invention and not to limit the same, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, which should be covered by the claims of the present invention.
Claims (4)
1. A heat treatment production process of a primary dedusting fan impeller of a high-corrosion-resistance wear-resistance converter is characterized by comprising the following steps:
(1) fixing a wheel disc or a cover disc to be welded with a high-temperature anti-deformation tire, and then hoisting the wheel disc or the cover disc into a special heat treatment process furnace, wherein the special heat treatment process furnace automatically completes solid solution and overaging treatment;
(2) after fixing the blades to be welded and the high-temperature anti-deformation tire, hoisting the blades into a special heat treatment process furnace, and automatically completing solid solution and overaging treatment by the special heat treatment process furnace;
(3) respectively welding the wheel disc and the cover disc processed in the step (1) with the blade processed in the step (2), and specifically performing the following steps:
(3-1) in the welding process, hoisting the wheel disc processed in the step (1), the blade processed in the step (2) and a welding rod into a special heat treatment process furnace, heating to 150-;
(3-2) hoisting the impeller prototype obtained in the step (3-1), the cover disc treated in the step (1) and the welding rod into a special heat treatment process furnace, heating to 150-;
wherein, the blade is made of precipitation hardening stainless steel 0Cr14Ni6Mo2Cu2Nb, and the wheel disc and the cover disc are made of alloy steel 15MnNiCrMo 2V; or the blades, the wheel disc and the cover disc are made of precipitation hardening stainless steel 0Cr14Ni6Mo2Cu2 Nb;
the solution treatment of the wheel disc or the cover disc in the step (1) is specifically as follows: heating the wheel disc or the cover disc to 850 ℃, then preserving heat for 1h, then continuously heating to 1000-1100 ℃ for solution treatment for 2-5h, and then cooling by air; wherein argon is introduced for protection during the solution treatment;
the overaging treatment of the wheel disc or the cover disc in the step (1) specifically comprises the following steps: heating the wheel disc or the cover disc subjected to the solution treatment to 500-700 ℃, and carrying out heat preservation for 5-6h and then carrying out air cooling;
the blade solution treatment in the step (2) is specifically as follows: heating the blades to 850 ℃, then preserving heat for 1h, then continuously heating to 1000-1100 ℃ for solution treatment for 2-5h, and then cooling with air; wherein argon is introduced for protection during the solution treatment;
the blade overaging treatment in the step (2) is specifically as follows: heating the blades subjected to the solution treatment to 500-700 ℃, preserving the heat for 5h, and then cooling the air;
the welding stress relief treatment in the step (3-1) and the step (3-2) comprises the following specific steps: and heating the welded workpiece, namely the impeller prototype and the impeller to 500-700 ℃, preserving the heat for 7h, and then cooling the workpiece by air.
2. The heat treatment production process of the high-corrosion-resistance wear-resistance converter primary dust removal fan impeller according to claim 1, wherein the impeller comprises a wheel disc (1), a cover disc (2) and a plurality of blades (3), the blades (3) comprise long blades (3-1) and short blades (3-2), the impeller adopts a double-layer crack type long and short blade form, the impeller is formed by welding the blades (3) with the wheel disc (1) and the cover disc (2) respectively, and the long blades (3-1) and the short blades (3-2) on the impeller are arranged in a concentric circle in a staggered mode.
3. The heat treatment production process of the high-corrosion-resistance wear-resistance converter primary dedusting fan impeller according to claim 1, characterized in that the precipitation hardening stainless steel 0Cr14Ni6Mo2Cu2Nb is subjected to forging heat treatment before being processed into a workpiece, specifically, after the precipitation hardening stainless steel 0Cr14Ni6Mo2Cu2Nb is forged, the temperature is kept at 850 ℃ for 1h, then the solution treatment is carried out at 1050 ℃ for 2-5h, and then the air cooling is carried out after the overaging treatment is carried out at 640 ℃ for 5-6 h.
4. The heat treatment production process of the primary dedusting fan impeller of the high-corrosion-resistance wear-resistance converter according to claim 1, characterized in that the materials of the welding rods in the step (3-1) and the step (3-2) meet the following conditions: the alloy elements comprise Cr, Ni and Mo; the elongation is 20-25%; the tensile strength is 800-850 MPa; the hardness is HB 90-96.
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