S25073+q345r composite plate for high-pressure cyclone separator and preparation method thereof

Abstract

The application provides a S25073+Q345R composite plate for a high-pressure cyclone separator and a preparation method thereof, and belongs to the technical field of explosive-welded composite plates.The composite plate is a double-layer composite structure composed of a base plate and a cover plate; the composite plate is formed by explosive welding; the base plate is a Q345R steel plate, and the thickness of the base plate is 10-70 mm; and the cover plate is a S25073 steel plate, and the thickness of the cover plate is 3-8 mm.The S25073 cover plate can resist 250 DEG C high temperature for a long time, effectively resist the corrosion of strong corrosive media such as sulfur and chlorine, and has excellent wear resistance; the Q345R base plate has high strength and good toughness, and can meet the stress requirement of the cyclone separator; the overall performance of the composite plate is better than that of the existing ordinary stainless steel composite plate and single dual-phase steel plate material, the service life can be prolonged to 3-5 years, and the equipment maintenance cost is greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of explosively welded composite plate technology, and in particular to an S25073+Q345R composite plate for high-pressure cyclone separators and its preparation method. Background Technology

[0002] Cyclone separators are widely used gas-solid separation equipment in industrial production, especially in petrochemical fluidized catalytic cracking units and metallurgical furnace gas purification. They need to operate for a long time under high temperature (250℃), high corrosion (containing sulfur, chlorine, acid mist and other media), and high particle erosion conditions, which puts forward stringent requirements on the high temperature resistance, corrosion resistance and high strength performance of the equipment body plate.

[0003] Currently, the plates used in existing cyclone separators are mainly divided into two categories: one is single-material plates, such as ordinary carbon steel (Q235B, Q345R), which have high strength and low cost, but extremely poor high temperature resistance and corrosion resistance. They are prone to oxidation and corrosion failure under high temperature and high corrosion conditions, and their service life is usually less than 1 year; the other is composite plates, which mostly use Q345R as the base plate and ordinary stainless steel (such as 304, 316L) as the cladding. Although the corrosion resistance is slightly improved, the resistance to pitting corrosion, crevice corrosion and chloride stress corrosion under high temperature conditions is limited. Under long-term high temperature conditions, the stainless steel cladding is prone to intergranular corrosion and embrittlement, and its erosion resistance is insufficient, which cannot meet the requirements for long-term stable operation.

[0004] In addition, existing technologies also employ 2205 duplex stainless steel as the plate material for cyclone separators. Its high-temperature resistance and corrosion resistance are superior to ordinary stainless steel. However, 2205 duplex stainless steel is expensive, and the strength of a single material is insufficient to fully match the stress requirements of cyclone separators, limiting its large-scale application. Furthermore, existing composite plate manufacturing processes often suffer from problems such as weak interfacial bonding, coating peeling, and unstable performance, further affecting the service life and operational safety of cyclone separators.

[0005] Therefore, developing a composite plate for cyclone separators that combines high temperature resistance, strong corrosion resistance, high strength, controllable cost, mature manufacturing process, and stable performance has become a pressing technical challenge in this field. Summary of the Invention

[0006] The purpose of this invention is to provide an S25073+Q345R composite plate for high-pressure cyclone separators and its preparation method, addressing the shortcomings of existing technologies.

[0007] To achieve the above-mentioned objectives, the present invention provides the following technical solution: This invention provides an S25073+Q345R composite plate for a high-pressure cyclone separator. The composite plate is a double-layer composite structure composed of a substrate and a cover plate. The composite plate is formed by explosive bonding. The substrate is a Q345R steel plate with a thickness of 10~70mm; the cladding plate is an S25073 steel plate with a thickness of 3~8mm.

[0008] Preferably, the thickness of the composite plate is 13~78mm, and the thickness ratio of the substrate to the cover plate is 3~20:1.

[0009] This invention also provides a method for preparing the S25073+Q345R composite plate for the high-pressure cyclone separator, comprising the following steps: 1) After polishing the mating surfaces of the Q345R steel plate, cover it with a polyethylene film to obtain a pretreated Q345R steel plate; The mating surfaces of the S25073 steel plate are sequentially polished, cleaned, and covered with polyethylene film to obtain a pretreated S25073 steel plate. 2) Place the pretreated S25073 steel plate on top of the pretreated Q345R steel plate, with the mating surfaces of the pretreated S25073 steel plate and the pretreated Q345R steel plate facing each other, center-aligned and horizontally placed, with a V-shaped support piece between the pretreated S25073 steel plate and the pretreated Q345R steel plate. 3) Lay the explosive for welding on the upper surface of the cover plate, place the digital electronic detonator in the center of the explosive for welding, and detonate the digital electronic detonator to obtain the composite plate blank; 4) After heat treatment, the composite board blank is cooled to room temperature in air to obtain the S25073+Q345R composite board for high-pressure cyclone separator.

[0010] Preferably, the roughness Ra of the mating surface of the Q345R steel plate after polishing in step 1) is ≤3.2μm; After polishing, the roughness Ra of the mating surface of the S25073 steel plate is ≤2.0μm, and the cleaning reagent is acetone or alcohol.

[0011] Preferably, in step 2), the vertical distance between the pretreated S25073 steel plate and the pretreated Q345R steel plate is 6~18mm, the opening angle of the V-shaped support plate is 60~80°, the spacing between the V-shaped support plates is 300~450mm, and the V-shaped support plates are arranged in a diamond shape.

[0012] Preferably, the explosive for explosive welding in step 3) comprises powdered emulsion explosive and inert material, wherein the inert material is quartz sand or industrial salt; the thickness of the explosive for explosive welding is 30~50mm.

[0013] Preferably, the density of the explosive used for explosive welding is 0.95~1.02 g / cm³. 3 The detonation velocity is 2100~2200m / s, and the saturation is 9.2~9.4mm.

[0014] Preferably, the heat treatment temperature in step 4) is 530~550℃, the time is 1~2.5h, and the rate of heating to the heat treatment temperature is 120~160℃ / h.

[0015] Preferably, the time for cooling to room temperature in air in step 4) is 6 to 10 hours.

[0016] The beneficial effects of this invention are: 1) Significant performance advantages: Using S25073 super duplex steel plate as the cladding and Q345R steel plate as the base plate, the two complement each other. The S25073 cladding can withstand high temperatures of 250℃ for a long time, effectively resisting the erosion of strong corrosive media such as sulfur and chlorine, and has excellent wear resistance. The Q345R base plate has high strength and good toughness, which can meet the stress requirements of cyclone separators. The overall performance of the composite plate is superior to that of existing ordinary stainless steel composite plates and single duplex steel plates, and the service life can be extended to 3-5 years, significantly reducing equipment maintenance costs.

[0017] 2) Controllable cost: Compared with single S25073 super duplex steel sheet, the present invention adopts a composite structure of "Q345R substrate + S25073 cladding", which can significantly reduce material costs (cost reduction of 30~40%) while ensuring performance, making it suitable for large-scale industrial applications.

[0018] 3) Mature manufacturing process: The explosive composite process, combined with optimized heat treatment process, ensures a strong metallurgical bond between the cladding and the substrate, with an interface bonding strength of ≥300MPa. There are no problems such as cladding peeling or cracking. The manufacturing efficiency is high, and mass production can be achieved. There is no need to develop new equipment, and the implementation difficulty is low.

[0019] 4) Wide adaptability: The thickness ratio of the cover plate to the base plate can be adjusted according to the specific working conditions of the cyclone separator (temperature, corrosion intensity, stress magnitude), making it suitable for high-temperature, high-pressure, and highly corrosive cyclone separators in different fields such as petrochemical, metallurgy, and coal chemical industries, with a wide range of applications.

[0020] 5) Process detail optimization: The substrate and the cladding are covered with a PE protective film before explosive bonding. Unlike the traditional bare storage, this can effectively prevent oxidation and contamination of the bonding surface, effectively reduce the amount of harmful phases such as intermetallic compounds at the bonding interface after explosive bonding, and improve the bonding strength. Attached Figure Description

[0021] Figure 1 This is a top view schematic diagram of the placement of the V-shaped support plate of the present invention; Figure 2 This is a schematic diagram of the installation structure of the S25073+Q345R composite plate for the high-pressure cyclone separator of the present invention. In the diagram, 1 is the detonation bed, 2 is the base plate, 3 is the V-shaped support plate, 4 is the cover plate, 5 is the explosive frame, 6 is the explosive for explosive welding, 7 is the digital electronic detonator, and 8 is the detonator lead wire. Detailed Implementation

[0022] This invention provides an S25073+Q345R composite plate for a high-pressure cyclone separator. The composite plate is a double-layer composite structure composed of a substrate and a cover plate. The composite plate is formed by explosive bonding. The substrate is a Q345R steel plate with a thickness of 10~70mm; the cladding plate is an S25073 steel plate with a thickness of 3~8mm.

[0023] In this invention, the thickness of the substrate is preferably 30-66 mm, more preferably 40-60 mm, and even more preferably 42-58 mm; the thickness of the cladding is preferably 4-7 mm, and even more preferably 5-6 mm.

[0024] In this invention, the thickness of the composite plate is preferably 13~78mm, more preferably 35~70mm, and even more preferably 45~65mm; the thickness ratio of the substrate to the cladding is preferably 3~20:1, more preferably 10~18:1, and even more preferably 14~16:1.

[0025] In this invention, Q345R steel plate is a low-alloy high-strength structural steel, and S25073 steel plate is a super duplex steel plate. Q345R steel plate has excellent high strength, good toughness and resistance to hydrogen embrittlement, and its cost is controllable. It can meet the stress requirements of the cyclone separator body and provide stable structural support for the composite plate. S25073 super duplex steel contains high levels of chromium, molybdenum and nitrogen, and has excellent high temperature resistance (can withstand high temperature of 250℃ for a long time), strong corrosion resistance (resistant to sulfur-containing and chlorine-containing media corrosion) and wear resistance. It can effectively resist oxidation, corrosion and particle erosion under high temperature and high corrosion conditions, and protect the substrate from damage. The thickness ratio of the cladding plate to the substrate can be adjusted according to the specific operating conditions of the cyclone separator (such as temperature, corrosion intensity and stress) to ensure that the composite plate has both structural strength and corrosion resistance and high temperature resistance.

[0026] This invention also provides a method for preparing the S25073+Q345R composite plate for the high-pressure cyclone separator, comprising the following steps: 1) After polishing the mating surfaces of the Q345R steel plate, cover it with a polyethylene (PE) film to obtain a pretreated Q345R steel plate. The mating surfaces of the S25073 steel plate are sequentially polished, cleaned, and covered with polyethylene film to obtain a pretreated S25073 steel plate. 2) Place the pretreated S25073 steel plate on top of the pretreated Q345R steel plate, with the mating surfaces of the pretreated S25073 steel plate and the pretreated Q345R steel plate facing each other, center-aligned and horizontally placed, with a V-shaped support piece between the pretreated S25073 steel plate and the pretreated Q345R steel plate. 3) Lay the explosive for welding on the upper surface of the cover plate, place the digital electronic detonator in the center of the explosive for welding, and detonate the digital electronic detonator to obtain the composite plate blank; 4) After heat treatment, the composite board blank is cooled to room temperature in air to obtain the S25073+Q345R composite board for high-pressure cyclone separator.

[0027] In this invention, the roughness of the mating surface of the Q345R steel plate after polishing in step 1) is preferably Ra≤3.2μm, and more preferably Ra≤3.0μm; The roughness of the mating surface of the S25073 steel plate after polishing is preferably Ra≤2.0μm, more preferably Ra≤1.8μm, and the cleaning reagent is preferably acetone or alcohol.

[0028] In this invention, step 1) involves polishing the Q345R steel plate to remove surface oxide scale, rust, oil, and impurities, ensuring a surface roughness Ra ≤ 3.2 μm to prevent impurities from affecting the interfacial bonding quality, and then covering it with a PE protective film for surface protection; polishing the S25073 steel plate to remove surface oxide film and impurities to ensure a clean coating surface; and then covering it with a PE protective film for surface protection; the thickness of the PE protective film is preferably 100~150 μm, more preferably 110~140 μm, and even more preferably 120~130 μm.

[0029] In this invention, the vertical distance between the pretreated S25073 steel plate and the pretreated Q345R steel plate in step 2) is preferably 6~18mm, more preferably 10~16mm, and even more preferably 12~15mm; the opening angle of the V-shaped support plate is preferably 60~80°, more preferably 65~75°, and even more preferably 70°; the spacing between the V-shaped support plates is preferably 300~450mm, and even more preferably 350~400mm; the V-shaped support plates are preferably arranged in a diamond shape; the pretreated S25073 steel plate and the pretreated Q345R steel plate are aligned vertically.

[0030] In this invention, the explosive for explosive welding in step 3) preferably comprises powdered emulsion explosive and inert material, wherein the inert material is preferably quartz sand or industrial salt; the thickness of the explosive for explosive welding is preferably 30-50 mm, more preferably 35-45 mm, and more preferably 40 mm.

[0031] In this invention, the mass ratio of powdered emulsion explosive to inert material is preferably 0.8~0.9:1, more preferably 0.82~0.88:1, and even more preferably 0.85~0.86:1; the powdered emulsion explosive can be a commercially available product that meets the requirements of GB 28286-2024 "General Technical Conditions for Industrial Explosives".

[0032] In this invention, the density of the explosive used for explosive welding is preferably 0.95~1.02 g / cm³. 3 Further preferably, it is 0.97~1.01 g / cm³. 3 More preferably, it is 0.99~1 g / cm³. 3 The detonation velocity is preferably 2100~2200m / s, more preferably 2120~2180m / s, and even more preferably 2150~2160m / s. The saturation is preferably 9.2~9.4mm, more preferably 9.25~9.35mm, and even more preferably 9.3mm.

[0033] In this invention, a digital electronic detonator is used for detonation. The explosive impact causes the cover plate to tilt and collide with the substrate at high speed. The metallographic bonding of the two is achieved by utilizing the plastic deformation of the metal to form a composite plate blank.

[0034] In this invention, the heat treatment temperature in step 4) is preferably 530~550℃, more preferably 535~545℃, and even more preferably 540℃; the heat treatment time is preferably 1~2.5h, more preferably 1.5~2h; and the rate of heating to the heat treatment temperature is preferably 120~160℃ / h, more preferably 130~150℃ / h, and even more preferably 140℃ / h.

[0035] In this invention, the time for cooling to room temperature (20~30°C) in air in step 4) is preferably 6~10h, more preferably 7~9h, and even more preferably 8h.

[0036] In this invention, heat treatment eliminates the internal stress generated during the explosion process, optimizes the microstructure of the composite board, improves the interfacial bonding strength and overall mechanical properties, and prevents the composite board from cracking and peeling off during use. The heat-treated composite board is then leveled, cut, polished, and ground to remove surface burrs and oxide scale, ensuring a smooth surface and dimensional accuracy (flatness of 1~3mm / m).

[0037] This invention addresses the problems of insufficient high-temperature and corrosion resistance, short service life, high cost, and defects in the manufacturing process of existing cyclone separator plates. It provides an S25073 / Q345R composite plate for high-temperature and high-corrosion cyclone separators and its manufacturing method. Through reasonable material combination and manufacturing process, the composite plate achieves the performance requirements of high temperature resistance, strong corrosion resistance, and high strength, while controlling costs, improving manufacturing stability, extending the service life of cyclone separators, and adapting to the long-term operation requirements of high-temperature and high-corrosion conditions.

[0038] A top view of the placement of the V-shaped support plate of the present invention is shown below. Figure 1 As shown, a 1mm distance from the edge to the support plate is understood as being infinitely close to the edge. A schematic diagram of the mounting structure of the S25073+Q345R composite plate for the high-pressure cyclone separator of this invention is shown below. Figure 2 As shown, 1 is the blasting bed, 2 is the base plate, 3 is the V-shaped support plate, 4 is the cover plate, 5 is the explosive frame, 6 is the explosive for explosive welding, 7 is the digital electronic detonator, and 8 is the detonator lead wire. Figure 2 The red line in the diagram represents the upper surface of the substrate.

[0039] The technical solutions provided by the present invention will be described in detail below with reference to the embodiments, but they should not be construed as limiting the scope of protection of the present invention.

[0040] In this embodiment, the powdered emulsion explosive was purchased from Qianjin Civil Explosives Co., Ltd., and the product name was: rock powdered emulsion explosive. The packaging method was: bag type, and the specification was 25kg / bag.

[0041] Example 1

[0042] The high-pressure cyclone separator uses an S25073+Q345R composite board, which consists of an S25073 cladding plate and a Q345R substrate. The composite board dimensions are (4mm+58mm)×2650mm×11280mm, conforming to NB / T 47002.1-2019 Class B1. The specific steps are as follows: A Q345R steel plate, conforming to the GB / T 713.2-2023 standard and having passed physical and chemical performance testing, was selected as the substrate. The dimensions were 58mm×2700mm×11400mm. The mating surfaces of the substrate were mechanically polished using a grinding wheel and a flap wheel to remove surface rust and oxide scale until the metal substrate was exposed and the roughness of the mating surfaces reached 3.1μm. A PE protective film (120μm thick) was then applied to protect the mating surfaces, resulting in a pre-treated substrate.

[0043] S25073 duplex stainless steel sheet, conforming to the GB / T 713.7-2023 standard and having passed physical and chemical performance testing, was selected as the cladding plate. Welding was performed according to design requirements, with dimensions of 4mm × 2740mm × 11440mm. The upper and lower surfaces of the weld were polished using a flap wheel to ensure the weld surface was flush with the base material on both sides. The plate was then leveled to control the flatness to 5~8mm / 2m. The mating surfaces of the cladding plate were polished using a flap wheel to remove the passivation film and oxide layer, exposing the metallic luster. The surface roughness reached 1.8μm. The mating surfaces were cleaned with acetone and then covered with a PE protective film (120μm thick) for protection, resulting in the pre-treated cladding plate.

[0044] Place the pretreated substrate horizontally on the prepared blasting bed. Ensure there are no hard boulders or wooden blocks beneath the blasting bed, and that the surface of the blasting bed is relatively flat without any overall unevenness or tilt. Remove the PE protective film from the substrate's mating surface. Place V-shaped support pieces at 300-350mm intervals along the substrate's edge, 1-2mm from the edge. Inside the substrate, place V-shaped support pieces in a diamond pattern at 400mm intervals (opening angle 65-75°). Then, remove the PE protective film from the cladding mating surface, placing it horizontally on the support pieces with the mating surface facing the substrate. Align the cladding mat with the substrate, leaving proportional allowance around the perimeter. The vertical distance between the pretreated substrate and the pretreated cladding mat should be 10mm. After placement, check the support pieces at the mating surface to ensure there is no collapse or deformation.

[0045] The explosive frame is vertically fixed at the edge of the cover plate, with the edge of the explosive frame aligned with the edge of the cover plate to prevent leakage of the laid explosives. After uniformly mixing powdered emulsion explosive and inert material quartz sand at a mass ratio of 0.85:1, a density of 0.97 g / cm³ is obtained. 3 This is a special explosive for welding, with a detonation velocity of 2133 m / s and a briss of 9.24 mm. The explosive is evenly spread on the surface of the covering plate, and a special scraping tool is used to scrape it to a thickness of 40 mm. A stainless steel ruler is then used to check the thickness, ensuring a deviation of ±2~3 mm. After the explosive is spread, other personnel are notified to evacuate. Blasting personnel and engineering technicians cooperate to check and confirm that there is no leakage of explosive from the explosive frame, no debris on the bonding surface, and that all relevant personnel and vehicles have safely evacuated. A digital electronic detonator is then placed in the center of the powdered emulsion explosive, and the detonator lead wire is connected to the blasting main line. Personnel then evacuate to a safe detonation area.

[0046] After network monitoring using a digital electronic detonator-specific initiator confirmed to be error-free, an initiation warning was issued, and detonation was initiated. The resulting S25073+Q345R explosively welded composite plate for the cyclone separator underwent 100% UT non-destructive testing, showing 100% bonding except at the initiation point. The diameter of the detonator zone at the initiation point was... A 20mm gap in adhesion does not meet the Class B1 requirements of NB / T 47002.1-2019. The detonator area cover at the detonation point must be completely removed by mechanical grinding, excavating down to 1-1.5mm from the substrate. After 100% PT testing confirms that the non-adhesive area at the detonation point has been completely removed, a certified welder shall perform welding repair according to the welding procedure qualification (PQR and WPS) approved by NB / T47014. The welding method shall be GTAW (Gargon arc welding), and the transition layer welding material shall be selected as... 2.0mm ER309MoL, filler material selected for cover layer. 2.0mm ER2594. After welding, the welded area was ground flush with the base material. After the temperature dropped to room temperature, PMI and 100% PT+UT tests were performed, both of which showed that they were qualified.

[0047] After cleaning the dirt and debris from the upper and lower surfaces of the composite board, it is placed in a heat treatment furnace at room temperature for stress relief heat treatment. The holding temperature is set at 540℃, the heating rate is 140℃ / h, and the holding time is 124min after reaching the set temperature. After the holding time is completed, it is removed from the furnace and allowed to cool naturally in still air for 8h. After the surface temperature drops to 30℃, a leveling process is performed to achieve a flatness of 1mm / m.

[0048] The composite plate samples from this embodiment underwent mechanical property and intergranular corrosion resistance tests. The tensile strength of the composite plate was measured to be 586 MPa, the yield strength to be 374 MPa, and the elongation after fracture to be 38%. The Charpy impact energy at -20℃ was 217 J, 231 J, and 209 J, respectively, all meeting the requirements of GB / T 713.2-2023. The shear strength was 363 MPa, meeting the requirement of ≥210 MPa in NB / T 47002.1-2019. The intergranular corrosion test results for the cladding plate were observed with a 10X magnifying glass on both the inner and outer curved surfaces, and no visible intergranular corrosion cracks were found, indicating that the cladding plate and the substrate were properly bonded. Then, the composite plate is edge-cut, and the surface is polished to remove oxides and burrs, so that the roughness reaches 2.0μm. After the surface quality passes visual inspection, it is packaged with vapor phase rust-preventive paper and put into storage, resulting in a cyclone separator S25073+Q345R explosion-welded composite plate that has passed all tests and meets the requirements of NB / T 47002.1-2019 B1 level.

[0049] Example 2

[0050] The high-pressure cyclone separator uses an S25073+Q345R composite plate, which consists of an S25073 cladding plate and a Q345R substrate. The composite plate dimensions are (3mm+42mm)×2500mm×6500mm, conforming to NB / T 47002.1-2019 Class B1. The specific steps are as follows: A Q345R steel plate with dimensions of 42mm×2550mm×6650mm was selected as the substrate, which passed the physical and chemical performance test and met the requirements of GB / T 713.2-2023. The substrate was mechanically polished with a grinding wheel and a flap wheel to remove surface rust and oxide scale until the metal substrate was exposed and the surface roughness Ra was 3.0μm. A PE protective film (130μm thick) was then covered to protect the bonding surface, resulting in a pre-treated substrate.

[0051] S25073 duplex stainless steel plates that have passed physical and chemical performance testing and meet the requirements of GB / T 713.7-2023 standard were selected as cladding plates. The welding process was completed according to the design dimensions, resulting in finished dimensions of 3mm × 2600mm × 6700mm. The upper and lower surfaces of the weld were polished using a flap wheel to ensure the weld surface was flush with the base material on both sides. Leveling was then performed to control the flatness of the plate surface to 3~5mm / m. The mating surfaces of the cladding plates were then polished using a flap wheel to remove the surface passivation film and oxide layer, exposing the metallic luster and achieving a surface roughness of 1.9μm. The mating surfaces were cleaned with acetone, and after cleaning, a PE protective film (130μm thick) was applied for protection, resulting in a pre-treated cladding plate.

[0052] Place the pretreated substrate horizontally on a flat and stable explosive welding base, ensuring that there are no hard boulders, wood blocks, or other debris below the base, and that the upper surface is flat without significant height differences or tilting. Remove the protective film from the substrate bonding surface. Arrange V-shaped support pieces at 300-350mm intervals along the edge of the substrate, with the support pieces 1-2mm from the substrate edge. Arrange V-shaped support pieces in a diamond pattern at 400mm intervals inside the substrate (with an opening angle of 65-75°). Then remove the PE protective film from the cover plate bonding surface. Place the cover plate horizontally on the support pieces, with the cover plate bonding surface facing the substrate bonding surface, aligning the cover plate with the center of the substrate, and leaving even allowance around the edges. The vertical distance between the pretreated substrate and the pretreated cover plate should be 12mm. After placement, check the condition of the support pieces to ensure they are not tilted or deformed.

[0053] An explosive frame is installed vertically along the edge of the cladding plate, with the outer edge of the frame aligned with the edge of the cladding plate to prevent leakage during explosive installation. Powdered emulsion explosive at a mass ratio of 0.88:1 is thoroughly mixed with inert filler quartz sand to obtain a density of 0.99 g / cm³. 3This explosive is a welding-specific explosive with a detonation velocity of 2162 m / s and a briss of 9.35 mm. The explosive is evenly spread on the surface of the cladding plate, smoothed to a thickness of 35 mm using a specialized scraper, and checked with a stainless steel ruler to control the thickness deviation within ±2~3 mm. After the explosive is laid, all irrelevant personnel are evacuated from the site. The blasting personnel and technicians jointly inspect the site to confirm that there is no leakage of explosive from the explosive frame, no foreign objects at the joint surfaces, and that personnel and equipment are in a safe area. A digital electronic detonator is then placed at the midpoint along the length of the cladding plate, and the detonator lead wire is reliably connected to the blasting main line. The personnel then evacuate to a safe detonation area.

[0054] A digital electronic detonator was used to complete network testing. After confirming that everything was correct, a detonation warning was issued and detonation was carried out, producing an S25073+Q345R explosively welded composite plate for cyclone separators. The composite plate underwent 100% UT ultrasonic testing to achieve 100% bonding. The edge detonation point had a diameter of approximately... The 20mm unbonded area was removed by cutting.

[0055] Clean the surface of the composite board and place it in a heat treatment furnace at room temperature for stress relief heat treatment. Set the holding temperature to 540℃ and the heating rate to 130℃ / h. After reaching the set temperature, hold for 90 minutes. After the holding period, remove it from the furnace and allow it to cool naturally in still air for 6 hours. After the surface temperature drops to 25℃, perform leveling treatment to achieve a flatness of 1.5mm / m.

[0056] In this embodiment, samples of the composite plate were taken for mechanical property and intergranular corrosion resistance testing of the cladding. The tensile strength of the composite plate was measured to be 605 MPa, the yield strength to be 381 MPa, and the elongation after fracture to be 35%. The Charpy impact energy at 0℃ was 196 J, 204 J, and 218 J, respectively, all meeting the requirements of GB / T 713.2-2023 standard. The shear strength was 350 MPa, meeting the requirement of not less than 210 MPa in NB / T 47002.1-2019 standard. The cladding was subjected to intergranular corrosion testing according to Method G in GB / T 4334. The bending method and metallographic method were used to inspect the inner and outer surfaces of the samples, and no intergranular corrosion cracks were found, thus the samples were deemed qualified. The composite plate is trimmed at the edges and polished to remove oxide scale and burrs, so that the surface roughness is controlled at Ra 2.0μm. After passing the visual inspection, it is packaged with vapor phase rust inhibitor paper and put into storage, thus producing the S25073+Q345R explosion-welded composite plate for cyclone separators that meets the B1 level requirements of NB / T 47002.1-2019 standard.

[0057] This invention employs an explosive composite process to prepare S25073 / Q345R composite plates. This process has the advantages of high interfacial bonding strength, stable performance, high preparation efficiency, and suitability for industrial mass production. The composite plates are suitable for cyclone separators operating in the field of cleaning equipment under conditions of 250°C high temperature and highly corrosive media (such as sulfur-containing and chlorine-containing media), and can solve the technical problems of insufficient high temperature resistance, corrosion resistance, and short service life of existing cyclone separator plates.

[0058] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A composite plate of S25073+Q345R for a high-pressure cyclone separator, characterized in that, The composite board is a two-layer composite structure consisting of a substrate and a cover plate; the composite board is formed by explosive bonding. The substrate is a Q345R steel plate with a thickness of 10~70mm; the cladding plate is an S25073 steel plate with a thickness of 3~8mm.

2. The S25073+Q345R composite plate for high-pressure cyclone separator according to claim 1, characterized in that, The thickness of the composite plate is 13~78mm, and the thickness ratio of the substrate to the cover plate is 3~20:

1.

3. The method for preparing the S25073+Q345R composite plate for the high-pressure cyclone separator according to claim 1 or 2, characterized in that, It includes the following steps: 1) After polishing the mating surfaces of the Q345R steel plate, cover it with a polyethylene film to obtain a pretreated Q345R steel plate. The mating surfaces of the S25073 steel plate are sequentially polished, cleaned, and covered with polyethylene film to obtain a pretreated S25073 steel plate. 2) Place the pretreated S25073 steel plate on top of the pretreated Q345R steel plate, with the mating surfaces of the pretreated S25073 steel plate and the pretreated Q345R steel plate facing each other, aligned at the center and placed horizontally, with a V-shaped support piece between the pretreated S25073 steel plate and the pretreated Q345R steel plate. 3) Lay the explosive for welding on the upper surface of the cover plate, place the digital electronic detonator in the center of the explosive for welding, and detonate the digital electronic detonator to obtain the composite plate blank; 4) After heat treatment, the composite board blank is cooled to room temperature in air to obtain the S25073+Q345R composite board for high-pressure cyclone separator.

4. The preparation method according to claim 3, characterized in that, Step 1) The roughness Ra of the mating surface of the Q345R steel plate after polishing is ≤3.2μm; After polishing, the roughness Ra of the mating surface of the S25073 steel plate is ≤2.0μm, and the cleaning reagent is acetone or alcohol.

5. The preparation method according to claim 3 or 4, characterized in that, Step 2) The vertical distance between the pretreated S25073 steel plate and the pretreated Q345R steel plate is 6~18mm, the opening angle of the V-shaped support plate is 60~80°, the spacing between the V-shaped support plates is 300~450mm, and the V-shaped support plates are arranged in a diamond shape.

6. The preparation method according to claim 5, characterized in that, Step 3) The explosive for explosive welding comprises powdered emulsion explosive and inert material, the inert material being quartz sand or industrial salt; the thickness of the explosive for explosive welding is 30~50mm.

7. The preparation method according to claim 6, characterized in that, The density of the explosive used for explosive welding is 0.95~1.02 g / cm³. 3 The detonation velocity is 2100~2200m / s, and the saturation is 9.2~9.4mm.

8. The preparation method according to claim 6 or 7, characterized in that, Step 4) The heat treatment temperature is 530~550℃, the time is 1~2.5h, and the rate of heating to the heat treatment temperature is 120~160℃ / h.

9. The preparation method according to claim 8, characterized in that, Step 4) describes cooling the air to room temperature for 6-10 hours.

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