A GH2747 explosion-proof composite plate for rotary kiln shell and its manufacturing process

Abstract

This invention provides a GH2747 explosive composite plate for rotary kiln shells and its manufacturing process, belonging to the field of metal composite plate manufacturing technology. The GH2747 explosive composite plate of this invention has a double-layer composite structure, including a base plate and a cover plate. The cover plate is made of GH2747 high-temperature alloy steel plate, and the base plate is made of austenitic stainless steel or high-temperature carbon steel plate. The cover plate and the base plate are bonded together by explosive welding. This invention adopts a double-layer composite structure, and through optimized matching of the thickness of the cover plate and the base plate, it ensures both the high-temperature resistance and oxidation resistance of the surface layer of the kiln shell and the overall structural strength, significantly reducing material costs. Through the synergistic effect of process steps such as grinding pretreatment, support gap design, selection of low-explosive explosives, and stress-relieving heat treatment, the entire process chain is stable and reliable, enabling the mass production of GH2747 explosive composite plates with a 100% bonding rate, high interfacial shear strength, and fully meeting the stringent requirements of rotary kiln shells.

Description

Technical Field

[0001] This invention relates to the field of metal composite plate manufacturing technology, and in particular to a GH2747 explosion-proof composite plate for rotary kiln cylinders and its production process. Background Technology

[0002] Rotary kilns are core high-temperature thermal equipment in the metallurgical, building materials, chemical, and environmental protection fields, widely used in scrap steel smelting, mineral roasting, and clinker calcination. Their cylinders operate for extended periods in high-temperature, corrosive flue gas environments, placing stringent requirements on the high-temperature resistance, corrosion resistance, and structural stability of the materials used. Material properties directly determine the equipment's service life, operational safety, and production economy. Currently, the mainstream materials for rotary kiln cylinders in the metallurgical industry are conventional carbon structural steels such as Q245R and Q355D, as well as low-alloy high-strength steels. These materials offer excellent processing and welding performance and are inexpensive, meeting the requirements of conventional low-temperature (≤350℃) neutral operating conditions. However, under high-temperature (≥800℃) metallurgical conditions, their high-temperature resistance and resistance to hot corrosion are insufficient. Long-term service can lead to problems such as high-temperature creep, oxidation spalling, and structural deformation, shortening the cylinder's lifespan, increasing maintenance costs, and failing to meet the demands of continuous high-temperature operations.

[0003] To improve the high-temperature resistance of the cylinder, the industry uses S31008 austenitic heat-resistant stainless steel to manufacture the cylinder. Its long-term operating temperature can reach 800~1100℃, and its high-temperature oxidation resistance and thermal stability are improved compared to conventional steels, making it suitable for higher-temperature operating environments. However, in actual metallurgical production, the cylinder is exposed to complex corrosive atmospheres containing sulfur and carbon, as well as high-temperature alternating loads. S31008 stainless steel is prone to intergranular corrosion, especially at weld seams and the weld heat-affected zone. This can easily lead to localized cracking and leakage, posing safety hazards and hindering the long-term stable operation of the equipment. This affects production continuity and operational safety, limiting the extension of the equipment's service life.

[0004] GH2747 alloy, as a high-performance high-temperature alloy, can be used at temperatures ranging from 1100 to 1250℃ for extended periods. It possesses excellent high-temperature strength, high-temperature oxidation resistance, and resistance to intergranular corrosion. This effectively addresses the technical shortcomings of existing cylinder materials, such as insufficient high-temperature resistance, susceptibility to intergranular corrosion, short lifespan, and significant safety hazards, significantly improving the adaptability and durability of cylinders under extreme operating conditions. However, the raw materials for this alloy are scarce, the manufacturing process is complex, and the cost is high. Using only GH2747 alloy to manufacture cylinders would substantially increase equipment production costs and initial investment, making large-scale industrial application difficult and failing to balance equipment performance with production economics.

[0005] In summary, the materials used for rotary kiln shells in the metallurgical industry generally suffer from the problem of difficulty in achieving both high temperature resistance and corrosion resistance, as well as an imbalance between cost and performance. The existing material system cannot simultaneously meet the industrial requirements of adapting to high-temperature working conditions, long-term safe operation, and economically controllable production.

[0006] Therefore, it is of great significance to provide a composite plate for rotary kiln shells that is suitable for the high-temperature and complex working conditions of rotary kilns, can avoid intergranular corrosion, extend equipment life, has controllable cost, and is feasible for industrial implementation. Summary of the Invention

[0007] The purpose of this invention is to provide a GH2747 explosion-bonded composite plate for rotary kiln bodies and its manufacturing process, so as to solve the technical problems in the prior art that it is difficult to achieve high-quality explosion-bonding of GH2747 high-temperature alloy with austenitic stainless steel or high-temperature carbon steel substrate, as well as the technical problems of insufficient bonding strength and poor plate shape of composite plates.

[0008] To achieve the above-mentioned objectives, the present invention provides the following technical solution: This invention provides a GH2747 explosion-bonded composite plate for rotary kiln bodies. The GH2747 explosion-bonded composite plate is a double-layer composite structure, including a base plate and a cover plate. The cover plate is a GH2747 high-temperature alloy steel plate, and the base plate is an austenitic stainless steel or high-temperature carbon steel plate. The cover plate and the base plate are bonded together by explosion welding.

[0009] Furthermore, the thickness of the cover plate is 3-6 mm, and the thickness of the substrate is 30-70 mm.

[0010] The present invention also provides a production process for the GH2747 exploded composite plate for the rotary kiln shell, comprising the following steps: 1) Polish, clean, and apply protective film to the surfaces of the substrate and the cover plate to be bonded, respectively; 2) Place a support sheet on the mating surface of the treated substrate, and then place the mating surface of the treated cover plate face down on the support sheet, so that the center of the cover plate is aligned with the center of the substrate, and a reserved gap is formed between the substrate and the cover plate. 3) Lay explosive composite special explosives on the upper surface of the cover plate, set the detonation point in the laid explosives, and detonate by digital electronic detonator to achieve explosive welding between the cover plate and the substrate to obtain composite plate blank. 4) The composite board blank is heat-treated, then leveled, cut and surface-treated to obtain GH2747 exploded composite board.

[0011] Furthermore, in step 1), the polishing method is as follows: the substrate bonding surface is polished with a 60-mesh flap wheel, and the cover plate bonding surface is polished with an 80-mesh flap wheel.

[0012] Furthermore, in step 2), the support sheet is a GH2747 high-temperature alloy foil, and the shape of the support sheet is V-shaped, W-shaped or X-shaped, and the thickness of the support sheet is 0.18~0.3mm. The height of the reserved gap is 8~10mm.

[0013] Furthermore, in step 3), the explosive composite explosive is prepared by powdered emulsion explosive and inert material, wherein the inert material is a dispersant or quartz sand, and the amount of inert material added accounts for 40 to 60 wt% of the explosive composite explosive.

[0014] Furthermore, in step 3), the density of the explosive composite explosive is 0.91~0.97 g / cm³. 3 The detonation velocity is 2000~2200m / s, and the saturation is ≥8.6mm; the height of the explosive composite special explosive is 35~60mm.

[0015] Furthermore, in step 3), the detonation point is set as follows: an inverted conical cavity is made at the geometric center of the explosive composite explosive, industrial pure explosive is added into the cavity, a digital electronic detonator is vertically inserted into the industrial pure explosive, and then detonation is initiated.

[0016] Furthermore, in step 4), the heating rate of the heat treatment is 55~160℃ / h, and the heat treatment temperature is 500~580℃. Based on the total thickness of the composite plate, the heat treatment time is 2.5~3 min / mm.

[0017] The beneficial effects of this invention are: 1) This invention adopts a double-layer composite structure consisting of a GH2747 high-temperature alloy thin cladding plate and a low-cost austenitic stainless steel or high-temperature carbon steel thick substrate. Through the optimized matching of the cladding plate thickness of 3~6mm and the substrate thickness of 30~70mm, the surface performance of the cylinder is guaranteed to be resistant to high temperature and oxidation, while also ensuring the overall structural strength, and significantly reducing material costs.

[0018] 2) This invention uses a special explosive formulated with powdered emulsion explosive and a specific proportion of inert materials to precisely control the detonation velocity within a relatively mild range of 2000~2200m / s and a saturation ≥8.6mm, which is perfectly compatible with the explosive welding window of GH2747. This effectively avoids defects such as cracks and surface ablation during the welding of thin cladding plates, and achieves a large-area uniform and continuous metallurgical bond.

[0019] 3) The present invention sets a support piece of a specific shape and material between the substrate and the cover plate, and leaves a gap of 8~10mm to ensure the optimization of the collision point speed and angle, and promote the formation of a high-quality waveform interface; the detonation point adopts a design of central detonation combined with an inverted conical cavity and a digital electronic detonator, which makes the detonation wave transmission more uniform and significantly improves the overall flatness of the large-area composite board.

[0020] 4) The heat treatment after the composite process of this invention adopts a heating rate of 55~160℃ / h, a temperature range of 500~580℃, and a holding time of 2.5~3min / mm plate thickness. This can fully eliminate the internal stress generated by explosive welding, restore the excellent performance of the high-temperature alloy of the cladding plate, and at the same time reasonably control the degree of softening of the substrate, so as to finally obtain a composite plate with excellent plate shape and stable performance.

[0021] 5) Through the synergistic effect of process steps such as grinding pretreatment, support gap design, selection of low explosive velocity explosives and stress relief heat treatment, the entire process chain of this invention is stable and reliable, and can mass-produce GH2747 explosive composite plates with a bonding rate of 100%, high interfacial shear strength, and fully meet the stringent requirements of rotary kiln cylinders. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the installation structure of the GH2747 explosive composite plate (base and cover plate) prepared by the present invention, wherein 1 is the blasting bed, 2 is the base plate, 3 is the support plate, 4 is the cover plate, 5 is the explosive frame, 6 is the special explosive, 7 is the digital electronic detonator, and 8 is the detonator lead wire. Detailed Implementation

[0023] This invention provides a GH2747 explosion-bonded composite plate for rotary kiln bodies. The GH2747 explosion-bonded composite plate is a double-layer composite structure, including a base plate and a cover plate. The cover plate is a GH2747 high-temperature alloy steel plate, and the base plate is an austenitic stainless steel or high-temperature carbon steel plate. The cover plate and the base plate are bonded together by explosion welding.

[0024] In this invention, the substrate is preferably S31008 austenitic stainless steel or 15CrMoR high-temperature carbon steel.

[0025] In this invention, the thickness of the cover plate is 3-6 mm, preferably 4-5.5 mm, and more preferably 4.5-5 mm; the thickness of the substrate is 30-70 mm, preferably 40-60 mm, and more preferably 45-55 mm.

[0026] The present invention also provides a production process for the GH2747 exploded composite plate for the rotary kiln shell, comprising the following steps: 1) Polish, clean, and apply protective film to the surfaces of the substrate and the cover plate to be bonded, respectively; 2) Place a support sheet on the mating surface of the treated substrate, and then place the mating surface of the treated cover plate face down on the support sheet, so that the center of the cover plate is aligned with the center of the substrate, and a reserved gap is formed between the substrate and the cover plate. 3) Lay explosive composite special explosives on the upper surface of the cover plate, set the detonation point in the laid explosives, and detonate by digital electronic detonator to achieve explosive welding between the cover plate and the substrate to obtain composite plate blank. 4) The composite board blank is heat-treated, then leveled, cut and surface-treated to obtain GH2747 exploded composite board.

[0027] In this invention, the treated substrate bonding surface can also be placed on a flat blasting bed pre-laid with a fine sand buffer layer, and then a support sheet can be placed on it.

[0028] In this invention, the polishing method in step 1) is as follows: the substrate bonding surface is polished with a 60-mesh flap wheel, and the cover plate bonding surface is polished with an 80-mesh flap wheel.

[0029] In this invention, in step 2), the support sheet is a GH2747 high-temperature alloy foil, and the shape of the support sheet is V-shaped, W-shaped or X-shaped, preferably V-shaped or W-shaped, and more preferably V-shaped; the thickness of the support sheet is 0.18~0.3mm, preferably 0.2~0.28mm, and more preferably 0.22~0.25mm; The height of the reserved gap is 8~10mm, preferably 8.5~9.5mm, and more preferably 8.8~9.2mm.

[0030] In this invention, in step 3), the explosive composite explosive is prepared by powdered emulsion explosive and inert material. The inert material is a dispersant or quartz sand, preferably quartz sand. The amount of inert material added accounts for 40-60 wt% of the mass of the explosive composite explosive, preferably 45-55 wt%, and more preferably 48-52 wt%.

[0031] In this invention, the dispersant is sodium lignosulfonate or sodium polyacrylate.

[0032] In this invention, in step 3), the density of the explosive composite explosive is 0.91~0.97 g / cm³. 3 The preferred value is 0.93~0.95 g / cm³. 3 Further preferred is 0.94 g / cm³ 3 The detonation velocity is 2000~2200m / s, preferably 2050~2150m / s, and more preferably 2080~2120m / s; the saturation is ≥8.6mm, preferably ≥9.0mm, and more preferably ≥9.5mm; the height of the explosive composite special explosive is 35~60mm, preferably 40~55mm, and more preferably 45~50mm.

[0033] In this invention, in step 3), the detonation point is set as follows: an inverted conical cavity is made at the geometric center of the explosive composite explosive, industrial pure explosive is added into the cavity, a digital electronic detonator is vertically inserted into the industrial pure explosive, and then detonation is initiated.

[0034] In this invention, the composition of the industrial pure explosive can be a commercially available powdered emulsion explosive product that meets the requirements of GB 28286-2024 "General Technical Conditions for Industrial Explosives" and WJ9025-2004 "Powdered Emulsion Explosives".

[0035] In this invention, in step 4), the heating rate of the heat treatment is 55~160℃ / h, preferably 80~140℃ / h, and more preferably 100~120℃ / h; the heat treatment temperature is 500~580℃, preferably 520~560℃, and more preferably 540~550℃. Based on the total thickness of the composite plate, the heat treatment time is 2.5~3 min / mm, preferably 2.6~2.9 min / mm, and more preferably 2.7~2.8 min / mm.

[0036] In this invention, the purpose of heat treatment is to quickly pass through the critical temperature range of 450°C for intergranular corrosion sensitization, and the heat treatment temperature is kept below 600°C throughout the process, which can effectively avoid entering the sensitization danger zone of 600~800°C.

[0037] 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.

[0038] Example 1

[0039] A GH2747 high-temperature alloy steel plate with dimensions of 8930mm×2100mm×5mm was used as the cladding plate, and an S31008 austenitic stainless steel plate with dimensions of 8930mm×2100mm×36mm was used as the substrate. The mating surface of the S31008 substrate, which passed performance testing, was cleaned with a 60-grit flap wheel to remove oxide scale and surface contaminants. An industrial anti-rust film was then applied to the cleaned surface (i.e., the substrate mating surface) for later use. Similarly, the mating surface of the GH2747 cladding plate, which passed performance testing, was cleaned with an 80-grit flap wheel to remove the passivation film and surface contaminants. An industrial anti-rust film was then applied to the cleaned surface (i.e., the cladding plate mating surface) for later use. A V-shaped support sheet made of GH2747 high-temperature alloy foil is placed on the mating surface of the substrate. The support sheet is 0.25mm thick, evenly distributed, and ensures stable support. Then, the cover plate is placed on the support sheet with the mating surface facing down. The cover plate is adjusted to align with the center of the substrate, so that a reserved gap of 10mm is formed between the substrate and the cover plate.

[0040] A special explosive compound is laid on the upper surface of the cover plate. This explosive is composed of powdered emulsion explosive and quartz sand, with the amount of quartz sand accounting for 50 wt% of the total mass of the explosive compound. The density of the resulting explosive compound is 0.92 g / cm³. 3The detonation velocity is 2145 m / s, and the saturation is 9.6 mm. The height of the explosive is 45 mm. An inverted conical cavity is made at the geometric center of the explosive. Industrial pure explosive (manufacturer: Henan Qianjin Chemical Technology Group Co., Ltd.) is added into the cavity. A digital electronic detonator is vertically inserted into the industrial pure explosive, and then the detonator is detonated to achieve explosive welding between the cover plate and the base plate, thus obtaining a composite plate blank. The composite board blank was heated to 550℃ at a heating rate of 110℃ / h for heat treatment. The heat treatment time was 2.8min / mm based on the total thickness of the composite board. After the heat treatment, the board was leveled, cut and surface treated in sequence to obtain GH2747 exploded composite board.

[0041] The GH2747 explosion-proof composite plate prepared in Example 1 was tested using the following method: According to NB / T47013.3, after 100% UT testing, the composite steel plate meets the B1 grade requirements in NB / T47002.1-2019, with a bonding rate of 100%. Tensile tests were performed according to GB / T228, and the yield strength R... p0.2 The tensile strength is 317 MPa, and the tensile strength R is... m The yield strength is 439 MPa, and the elongation after fracture is 48%, which meets the yield strength R in the substrate S31008 material standard GB / T713.7-2023. p0.2 ≥205 MPa, tensile strength R m The requirements are ≥240 MPa and elongation after fracture ≥40%. Bending tests were conducted in accordance with GB / T232 and GB / T6396. The internal bending, external bending and side bending tests all met the standard requirements, and there were no cracks on the outer side of the bending surface. The shear test was conducted in accordance with the relevant provisions of GB / T6396, and the shear strength was 326 MPa, which meets the requirement of ≥210 MPa in NB / T47002.1.

[0042] Example 2

[0043] A GH2747 high-temperature alloy steel plate with dimensions of 9100mm×2450mm×3mm was used as the cladding plate, and a 15CrMoR steel plate with dimensions of 9100mm×2450mm×52mm was used as the base plate. The mating surfaces of the 15CrMoR base plate, which passed performance testing, were cleaned with a 60-grit flap wheel to thoroughly remove surface oxide scale, rust, oil, and other contaminants. After polishing, the surface dust was blown away with compressed air to ensure a uniform metallic luster on the mating surfaces. An industrial anti-rust film was immediately applied to the mating surfaces to prevent secondary contamination. The mating surfaces of the GH2747 cladding plate, which also passed performance testing, were cleaned with an 80-grit flap wheel to remove the surface passivation film, oxide layer, and impurities. After polishing, the mating surfaces were wiped with acetone to thoroughly remove residual oil. After drying with compressed air, an industrial anti-rust film was applied. The substrate is horizontally placed on a pre-set flat blasting bed on its mating surface. The blasting bed needs to be strictly leveled. A layer of fine sand with a thickness of 80mm is laid on the surface of the blasting bed as a buffer layer to reduce the damage to the substrate from the explosion impact. Then, the industrial anti-rust film is peeled off, and W-shaped support sheets made of GH2747 high-temperature alloy foil are evenly placed on the mating surface. The support sheets are 0.2mm thick and spaced 400mm apart, evenly distributed and ensuring stable support. Then, the cover plate is placed on the support sheet with the mating surface facing down. The cover plate is adjusted to align with the center of the substrate, so that a reserved gap of 8mm is formed between the substrate and the cover plate. Place the prepared cover plate with the mating surface facing down and the mating surface of the base plate opposite each other on the support plate. Adjust the position of the cover plate so that the center points of the cover plate and the base plate are aligned and the edge misalignment does not exceed 10mm. Carefully check that the support plate is not tilted or deformed. Then, fix a 2mm thick cardboard ring around the edge of the cover plate as a charge frame with a height of 60mm to ensure that the explosive does not overflow during subsequent explosive laying and to ensure that the explosive energy is evenly applied to the cover plate. A special explosive compound is laid on the upper surface of the cladding plate. This explosive is composed of powdered emulsion explosive and quartz sand, with the amount of quartz sand added accounting for 50 wt% of the explosive compound (to balance energy controllability and welding stability). The density of the resulting special explosive is 0.93 g / cm³. 3 The detonation velocity is 2180m / s and the briss is 9.8mm. The height of the explosive is 38mm to ensure that the explosive is laid flat, with uniform density, without lumps or voids, and to avoid excessive local energy that could cause damage to the cover plate or insufficient bonding. An inverted conical cavity is made at the geometric center of the laid special explosive. The cavity has a bottom diameter of 30mm and a height of 38mm. 45g of industrial pure explosive is added into the cavity. A digital electronic detonator is vertically inserted into the center of the industrial pure explosive, ensuring that the detonator depth is not less than 30mm. The detonator lead wire is firmly connected to the detonation wire. After checking and confirming that the detonation circuit is unobstructed, the detonation is carried out to achieve explosive welding between the cover plate and the base plate, resulting in a composite plate blank. The composite plate blank is heated to 580℃ at a heating rate of 120℃ / h (to avoid excessive heating and thermal stress). This temperature range can effectively eliminate the internal stress generated by explosive welding. The heat treatment time is 150 minutes based on the total thickness of the composite plate. After the heat treatment, the heating device is turned off and the composite plate is allowed to cool in the furnace to below 400℃. Then it is taken out of the furnace and cooled naturally to room temperature to avoid cracking caused by rapid cooling. The heat-treated composite plate blank is leveled to correct the flatness deviation of the composite plate and ensure that the flatness meets the processing requirements of the rotary kiln cylinder. Then, the edges are trimmed and the surface is polished to remove excess parts and surface defects, resulting in a GH2747 explosion composite plate with a surface roughness of Ra≤1.8μm.

[0044] The GH2747 explosion-proof composite plate prepared in Example 2 was tested using the following method: According to NB / T47013.3, after 100% UT testing, the composite board meets the B1 level requirements in NB / T47002.1-2019, with a 100% bonding rate and no defects such as unbonded, cracked, or delaminated, ensuring bonding reliability under high-temperature conditions. Tensile tests were performed according to GB / T228, and the yield strength R... p0.2 The tensile strength is 322 MPa, and the tensile strength R is... m The yield strength is 503 MPa, and the elongation after fracture is 39%, which meets the yield strength R of the 15CrMoR substrate material standard (thickness ≤ 60 mm). p0.2 ≥245 MPa, tensile strength R m The specified values ​​are 450~590 MPa and elongation at break ≥19%; Charpy pendulum impact test was conducted according to GB / T229, with a test temperature of 0℃ and a transverse impact absorption energy of K. v2 The values ​​are 198J, 211J, and 208J, which meet the requirement of an average value ≥ 47J in GB / T713.2; Bending tests were conducted in accordance with GB / T232 and GB / T6396. The internal bending, external bending and side bending tests all met the standard requirements, and there were no cracks or delamination on the outer side of the bending surface. The shear test was conducted in accordance with the relevant provisions of GB / T6396, and the shear strength was 341 MPa, which meets the requirement of ≥210 MPa in NB / T47002.1. Meanwhile, the GH2747 cladding was tested for high-temperature oxidation resistance according to GB / T13303. After being kept at 900℃ for 1000 hours, the oxidation weight gain was ≤0.08g / cm³. 2It meets the design requirements for high-temperature oxidation resistance and can effectively resist high-temperature corrosion caused by solid waste incineration. The 15CrMoR substrate has excellent resistance to hydrogen corrosion and high-temperature creep, making it suitable for long-term high-temperature operation of rotary kilns.

[0045] As can be seen from the above embodiments, the present invention provides a GH2747 explosive composite plate for rotary kiln shells and its manufacturing process. The GH2747 explosive composite plate of the present invention has a double-layer composite structure, including a base plate and a cover plate. The cover plate is a GH2747 high-temperature alloy steel plate, and the base plate is an austenitic stainless steel or high-temperature carbon steel plate. The cover plate and the base plate are bonded together by explosive welding. The present invention adopts a double-layer composite structure. Through the optimized matching of the thickness of the cover plate and the base plate, it not only ensures the high-temperature resistance and oxidation resistance of the surface of the shell, but also ensures the overall structural strength, significantly reducing material costs. Through the synergistic effect of process steps such as grinding pretreatment, support gap design, selection of low-explosive explosives, and stress-relieving heat treatment, the entire process chain is stable and reliable, and can mass-produce GH2747 explosive composite plates with a bonding rate of 100%, high interfacial shear strength, and fully meet the stringent requirements of rotary kiln shells.

[0046] 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 GH2747 explosion-proof composite plate for rotary kiln cylinders, characterized in that, The GH2747 explosion-bonded composite plate is a double-layer composite structure, including a base plate and a cover plate. The cover plate is a GH2747 high-temperature alloy steel plate, and the base plate is an austenitic stainless steel or high-temperature carbon steel plate. The cover plate and the base plate are bonded together by explosion welding.

2. The GH2747 explosion-proof composite plate for rotary kiln shells according to claim 1, characterized in that, The thickness of the cladding is 3-6 mm, and the thickness of the substrate is 30-70 mm.

3. A production process for GH2747 explosion-proof composite plate for rotary kiln shells as described in claim 1 or 2, characterized in that, Includes the following steps: 1) Polish, clean, and apply protective film to the surfaces of the substrate and the cover plate to be bonded, respectively; 2) Place a support sheet on the mating surface of the treated substrate, and then place the mating surface of the treated cover plate face down on the support sheet, so that the center of the cover plate is aligned with the center of the substrate, and a reserved gap is formed between the substrate and the cover plate. 3) Lay explosive composite special explosives on the upper surface of the cover plate, set the detonation point in the laid explosives, and detonate by digital electronic detonator to achieve explosive welding between the cover plate and the substrate to obtain composite plate blank. 4) The composite board blank is heat-treated, then leveled, cut and surface-treated to obtain GH2747 exploded composite board.

4. The production process of GH2747 explosion-proof composite plate for rotary kiln shell according to claim 3, characterized in that, In step 1), the polishing method is as follows: the substrate bonding surface is polished with a 60-grit flap wheel, and the cover plate bonding surface is polished with an 80-grit flap wheel.

5. The production process of GH2747 explosion-proof composite plate for rotary kiln shell according to claim 4, characterized in that, In step 2), the support sheet is a GH2747 high-temperature alloy foil, and the shape of the support sheet is V-shaped, W-shaped or X-shaped, and the thickness of the support sheet is 0.18~0.3mm. The height of the reserved gap is 8~10mm.

6. The production process of GH2747 explosion-proof composite plate for rotary kiln shell according to claim 4 or 5, characterized in that, In step 3), the explosive composite explosive is prepared by powdered emulsion explosive and inert material. The inert material is a dispersant or quartz sand, and the amount of inert material added accounts for 40 to 60 wt% of the explosive composite explosive.

7. The production process of GH2747 explosion-proof composite plate for rotary kiln shell according to claim 6, characterized in that, In step 3), the density of the explosive composite explosive is 0.91~0.97 g / cm³. 3 The detonation velocity is 2000~2200m / s, and the saturation is ≥8.6mm; the height of the explosive composite special explosive is 35~60mm.

8. The production process of GH2747 explosion-proof composite plate for rotary kiln shells according to claim 4, 5, or 7, characterized in that, In step 3), the detonation point is set as follows: an inverted conical cavity is made at the geometric center of the explosive composite explosive, industrial pure explosive is added into the cavity, a digital electronic detonator is vertically inserted into the industrial pure explosive, and then detonation is initiated.

9. The production process of GH2747 explosion-proof composite plate for rotary kiln shell according to claim 8, characterized in that, In step 4), the heating rate of the heat treatment is 55~160℃ / h, and the temperature of the heat treatment is 500~580℃. Based on the total thickness of the composite plate, the heat treatment time is 2.5~3 min / mm.

Images