CN109693072B - 825/X70/825 double-sided composite board and production method thereof - Google Patents

825/X70/825 double-sided composite board and production method thereof Download PDF

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CN109693072B
CN109693072B CN201710983305.2A CN201710983305A CN109693072B CN 109693072 B CN109693072 B CN 109693072B CN 201710983305 A CN201710983305 A CN 201710983305A CN 109693072 B CN109693072 B CN 109693072B
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CN109693072A (en
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蒋健博
王长顺
及玉梅
付魁军
王佳骥
刘芳芳
李文斌
张帅
傅博
韩严法
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Angang Steel Co Ltd
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    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/54—Yield strength; Tensile strength
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    • B32B2307/70—Other properties
    • B32B2307/714—Inert, i.e. inert to chemical degradation, corrosion

Abstract

The invention discloses an 825/X70/825 double-sided composite board and a production method thereof. The composite blank for manufacturing the composite plate comprises an X70 low-alloy steel base material and an 825 alloy composite material, wherein the length and the width of the base material are the same as those of the composite material, the length is 2-4 m, the width is 1-3 m, and the thickness ratio is 2-10; sequentially stacking the composite material and the base material processed by the machine in the order of the composite material, the base material and the composite material to form a composite blank, vacuumizing the composite blank, and carrying out vacuum electron beam sealing welding; heating the welded composite blank to 1200-1250 ℃, and preserving heat, wherein the rolling temperature is 1180-1200 ℃, the single pass reduction rate is more than or equal to 10%, the first three pass reduction rate is more than or equal to 15%, and the total reduction rate is more than or equal to 75%; the produced 5-70 mm composite board has excellent corrosion resistance at the inner side and the outer side and excellent mechanical property at the center, and is suitable for manufacturing pipelines which have high corrosion resistance requirements on the inner side and the outer side and have the mechanical property of the whole structure.

Description

825/X70/825 double-sided composite board and production method thereof
Technical Field
The invention belongs to the technical field of composite plate preparation, and particularly relates to a 825/X70/825 double-sided composite plate produced by applying a vacuum composite technology and a preparation method thereof.
Background
At H2S and CO2In coexistence conditions, metallic materials face two corrosion problems: the first is the environmental cracking performance of the material, and the second is the electrochemical corrosion problem of the material. High H content in many gas fields in Sichuan China2S、CO2The chloride ion content of gas field water is also high and the exploitation of these fields faces severe corrosion challenges. Aiming at oil well pipes and air pipes which are deeply buried, the underground oil well pipes and air pipes are not only corroded by the inner walls of pipelines by oil extraction and gas, but also threatened by external high-temperature, high-pressure and high-corrosivity environments. In order to ensure the safe and efficient development of the gas field, the nickel-based alloy adopted in the high-sulfur gas field has high reliability but high cost. In order to save material cost, the underground pipeline of the high-sulfur gas field can be a double-sided nickel-based alloy composite pipe.
The 825/X70/825 double-sided nickel-based alloy composite plate is a composite plate taking a full-austenite nickel-iron-chromium alloy 825 as a composite layer and a low-alloy steel X70 as a base layer, wherein the upper surface and the lower surface of the composite plate are respectively made of the 825 alloy, the center of the composite plate is made of X70 low-alloy steel, the design principle is that the X70 low-alloy steel base layer meets the structural strength requirement, and the 825 alloy composite layer meets the requirement of pipeline corrosion resistance. The 825/X70/825 double-sided composite plate combines the advantages of two metals, and compared with an integral alloy plate, the cost is effectively reduced, and the integral strength and safety are improved while the corrosion resistance is ensured.
At present, the main methods for producing the nickel-based alloy composite plate include an explosion method and a rolling method, and in addition, the mechanical composite method is applied more aiming at the aspect of composite pipes. The nickel-based alloy composite board produced by adopting the explosion method is greatly limited in specification and size and difficult to meet the requirements of users, and due to the production operation of a high-capacity rolling mill, the nickel-based alloy composite board prepared by adopting the explosion method is only adopted in certain special fields and has a tendency of being eliminated. The mechanical compounding method is to directly sleeve and embed the nickel-based alloy pipe and the pipeline steel pipe together without fixed connection, and the application field is very limited. In recent years, more and more researchers have studied the technology of preparing nickel-based alloy composite plates by a rolling method.
CN101564792A discloses an explosion welding method of a C22 nickel-based alloy clad steel plate, CN101559517A discloses an explosion welding method of a C276 nickel-based alloy clad steel plate, CN101559527A discloses an explosion welding method of a NO8825 nickel-based alloy clad steel plate, and CN101559528 discloses an explosion welding method of a NO6059 nickel-based alloy clad steel plate for flue gas desulfurization. But the specification and the size of the produced composite board are greatly limited, and the stability of the composite performance is poor.
CN105671424A discloses a nickel-based alloy clad steel plate for pipelines and a manufacturing method thereof, wherein the nickel-based alloy clad steel plate for pipelines is prepared by a rolling method, but the composite interface strength is limited, and the requirements of the current on the higher and higher composite strength cannot be met; CN104801562A discloses a method for producing a composite blank of steel nickel/nickel base alloy, which introduces a method for preparing a composite blank of a nickel base alloy composite plate by a rolling method, and has strong adaptability to equipment, but low production efficiency, complex process, low yield and high cost.
In the '825 alloy/20 steel bimetal composite pipe welding process' published by the 'process and new technology' 2015 vol.44, No.11, P33-36 paper of sheep Dongming et al and the 'Incoloy 825 alloy + X65 composite pipe weldability and welding process' published by the 'Yangxu' 2008 vol31, No.5, P33-35 paper of the 'welded pipe', nickel-based alloy composite plates prepared by a mechanical method are proposed, gaps exist between the composite layer metal and the base layer metal, the overall performance is poor, the overall structure stability is poor, and the pipeline prepared by the nickel-based alloy composite plates is easy to have the defects of fatigue fracture and the like of a welded joint.
CN101780530A discloses a method and an apparatus for preparing a double-sided composite slab, which prepares a metallurgical fusion-compounded layered composite slab by heating the surface of a substrate to make the substrate penetrate through a molten metal of a composite material. CN106111948A discloses a casting double-sided composite board-composite casting and a production method thereof, wherein a double-sided composite board is prepared by adopting a method of casting a molten base material between two composite materials. Although the process difficulty in the technology is low, the quality of the prepared composite board is poor, and the performances of the base material and the composite material cannot be guaranteed.
CN104759842A discloses a production method of stainless steel double-sided composite boards and coils, and CN104624702A discloses a preparation method of stainless steel double-sided composite boards, wherein the double-sided stainless steel composite boards are prepared by firstly preparing single-sided stainless steel composite boards and then compounding the single-sided stainless steel composite boards for the second time, and although the product quality is superior to the GB/T8566-2008 requirement, the process is high in complexity, complex in steps and not suitable for large-scale industrial production.
CN106269961A discloses a stainless steel double-sided composite board for a container and a manufacturing method thereof, wherein a vacuum electron beam packaging assembly and a hot rolling technology are adopted to prepare the double-sided stainless steel composite board, but the double-sided stainless steel composite board is used for the container, the carbon content is lower and is 0.051-0.143%, and the double-sided stainless steel composite board cannot meet the requirements of the existing oil and gas pipeline material on higher and higher strength.
The double-sided stainless steel composite plate is prepared by adopting an explosion cladding and rolling technology, and brief introduction is made on the production process flow and the process key points of the stainless steel composite plate in Xieyana and Lixin field, namely 'double-sided stainless steel composite plate cold rolling and heat treatment process discussion' published by Tianjin metallurgy 2003, vol.118(6), P25-26; the article "explosive welding and performance research of stainless steel-carbon steel single-sided and double-sided composite plates" published by Luming, Wang Guanghua, Wang Wei and the like in Material science and technology, No.8, P47-50, is that a double-sided stainless steel composite plate is prepared by an explosion method and the welding performance is researched. On one hand, the size and specification of the double-sided stainless steel composite plate prepared by the explosion method adopted in the two papers are limited by the process; on the other hand, the second surface composite causes increase of micro defects and stress on the first surface composite bonding interface, and the composite interface has low shear performance and poor stability.
In summary, the development of the preparation technology of the double-sided composite plate is less at present, and the development of the related technology of the double-sided nickel-based alloy composite plate is blank. In the face of multiple standards of economic cost, corrosion resistance, comprehensive mechanical properties and the like proposed for pipeline materials in the oil and gas exploitation and transportation industries, a preparation method of a double-sided nickel-based alloy composite plate with high performance and low cost is urgently needed to be developed. The invention provides a method for preparing a double-sided nickel-based alloy composite plate by adopting a vacuum electron beam welding assembly and hot rolling technology, which has the advantages of good product performance and stability, low process complexity and high production efficiency, and is particularly suitable for industrial large-scale production.
Disclosure of Invention
Based on market needs and the defects of the prior art, the overall performance and the economic cost of a high-corrosion-resistance pipeline are considered, the invention aims to provide the 825/X70/825 double-sided composite plate and the preparation method thereof, the double-sided nickel-based alloy composite plate is prepared by adopting a vacuum electron beam welding assembly and hot rolling technology, the process complexity is low, the production efficiency is high, and the double-sided nickel-based alloy composite plate is particularly suitable for industrial large-scale production so as to meet the increasing requirements of the pipeline field on low-cost and high-corrosion-resistance composite materials.
The 825/X70/825 double-sided composite board produced by the method of the invention not only ensures the high corrosion resistance of the inner and outer surfaces of the composite board, but also has higher structural strength as a whole. The produced 825/X70/825 double-sided nickel-based alloy composite plate has the advantages of flat plate shape, high composite interface strength and good stability, obviously reduces the economic cost compared with a pure 825 alloy plate, has simple production process, and can be used for producing flat plates and coiled plates.
The specific technical scheme is as follows:
A825/X70/825 double-sided composite board comprises a base layer and a composite layer, wherein the base layer is X70 low alloy steel, the low alloy steel comprises, by mass, not more than 0.08% of C, not more than 0.25% of Si, not more than 1.75% of Mn, not more than 0.003% of S, not more than 0.02% of P, not more than 0.07% of Nb, not more than 0.025% of Ti, not more than 0.15% of Mo, not more than 0.2% of Cr, not more than 0.25% of Ni, not more than 0.045% of Al, and the balance of Fe and unavoidable impurities; the composite layer is 825 alloy, wherein the 825 alloy comprises, by mass, not more than 0.03% of C, not more than 0.5% of Si, 19.5-23.5% of Cr, 38.0-46.0% of Ni, 2.5-3.5% of Mo, not more than 0.8% of Mn, 1.5-3.0% of Cu, 0.6-1.2% of Ti, not more than 0.015% of S, not more than 0.03% of P, not less than 22% of Fe, and the balance of unavoidable impurities.
The 825 alloy is a titanium-stabilized Ni-Fe-Cr-Mo-Cu corrosion-resistant alloy, and has chloride stress corrosion resistance, oxidation resistance and pitting corrosion resistance as well as neutral and reductive acid and alkali resistance due to the addition of Ni, Cr, Mo and other elements, wherein the addition of Cr can form a stable oxide film on the surface of the alloy, Ni can increase the Cl stress corrosion cracking resistance of the alloy, and Mo can improve the pitting corrosion resistance and intercrystalline corrosion resistance of the alloy.
With the increasing demand of petroleum and natural gas, the conveying pressure and pipe diameter of pipelines are increasing continuously in order to improve the conveying efficiency, so that higher requirements on the strength and toughness of pipeline steel are provided. At present, the X70 pipeline steel becomes the steel grade with the most use amount in international oil and natural gas long-distance pipeline steel.
The 825/X70/825 double-sided nickel-based alloy composite plate produced by the method ensures high corrosion resistance of the inner surface and the outer surface of the composite plate, and the corrosion resistance of the 825 alloy side is qualified; meanwhile, the whole composite plate has higher structural strength, the tensile strength of the composite plate is over 600MPa, the yield ratio is less than 0.92, the-20 ℃ impact energy of X70 is far greater than 190J, and the national standard requirement of X70 pipeline steel is met.
Compared with an explosion method or a mechanical method, the 825/X70/825 double-sided nickel-based alloy composite plate produced by the method has flat plate shape, and the plate width can reach 3 m; the composite interface has high strength and good stability, the interface shear strength of the composite interface reaches more than 450MPa, and the bonding rate is 100 percent. Compared with a pure 825 alloy plate, the alloy plate has obviously reduced economic cost and can be used for producing flat plates and coiled plates.
A production method of an 825/X70/825 double-sided composite plate is characterized in that the composite plate is formed by rolling a composite blank, the composite blank comprises an X70 low-alloy steel base material and an 825 alloy composite material, the length of the base material is 2-4 m, the width of the base material is 1-3 m, and the thickness of the base material is 16-140 mm; the length and the width of the composite material are the same as those of the base material, and the thickness of the composite material is 8-70 mm; the base material can be a continuous casting blank, an intermediate blank or a plate, the composite material is a plate, and the thickness ratio of the base material to the composite material is 2-10;
the method specifically comprises the following steps:
(1) an X70 low alloy steel substrate and an 825 alloy composite material are selected as assembly raw materials.
(2) The surface to be compounded of the base material and the composite material is processed in a machining mode of planing, grinding or milling and grinding, the processing depth is 3-5 mm, the flatness is guaranteed, and a rust layer and an oxidation layer on the surface to be compounded are removed.
(3) And (5) performing degreasing and blowing treatment on the machined surface.
(4) Two 825 alloy plates and an X70 low alloy steel are oppositely processed, and the 825 alloy plate, the X70 low alloy steel and the 825 alloy plate are sequentially stacked from top to bottom to form a composite blank.
(5) Grinding the surfaces of 30-50 mm on two sides of a gap formed between an X70 low-alloy steel base material and an 825 alloy composite material in the composite blank to remove a rust layer, an oxidation layer and grease;
(6) sending the composite blank into a vacuum chamber, vacuumizing, and then facing the side of the composite blankVacuum electron beam sealing welding is carried out on a gap 825-X70 and a gap X70-825, which are formed by sequentially stacking an 825 alloy composite material, an X70 low-alloy steel base material and the 825 alloy composite material, wherein the effective penetration of the vacuum electron beam sealing welding is 30-40 mm, the focus position deviates 1-3 mm from the 825 alloy, and the defocusing amount is-2-4 mm; vacuum degree of 1.0X 10-2～4.5×10-2Pa, and the contact surface of the 825 alloy and the X70 low alloy steel is in a vacuum environment.
(7) Heating the composite blank subjected to vacuum electron beam sealing welding to 1200-1250 ℃, preserving heat, calculating the heat preservation time according to 1min/mm multiplied by the total thickness of the composite blank, wherein the initial rolling temperature is 1180-1200 ℃, the single-pass reduction rate is more than or equal to 10%, the first three-pass reduction rate is more than or equal to 15%, the total reduction rate is more than or equal to 75%, the final rolling temperature is 760-830 ℃, the initial cooling temperature is 740-800 ℃, cooling by water, the re-reddening temperature is 450-550 ℃, and cooling by air to room temperature.
(8) And trimming the rolled composite plate to obtain a 825/X70/825 double-sided composite plate, wherein the thickness range of the finished product 825/X70/825 double-sided composite plate is 5-70 mm.
The rust layer and the oxidation layer of the surface to be compounded are machined and removed, so that the surface to be compounded can be contacted with each other by fresh metal in the rolling process, the metallurgical bonding between the surface to be compounded and the fresh metal is facilitated, the bonding quality is improved, and the defects of impurities, air holes, non-bonding and the like are avoided.
The 825 alloy/X70 low alloy steel/825 alloy assembly mode is adopted, so that the symmetry of the composite blank can be ensured, and the defects of plate shape warping and the like caused by uneven deformation resistance and shrinkage stress of different materials in the high-temperature rolling and cooling processes can be prevented.
The composite blank is subjected to vacuum electron beam packaging welding in a vacuum environment, so that the gas content between joint surfaces can be reduced to the maximum extent, and the phenomenon that the joint rate is not qualified due to gas residue after rolling is avoided. In addition, the reduction of the gas content between the joint surfaces also contributes to preventing secondary oxidation of the joint surfaces and to improving the joint performance.
The effective penetration of vacuum electron beam sealing welding is 30-40 mm, the focus position deviates 1-3 mm from 825 alloy, and the defocusing amount is-2-4 mm; the method has the advantages that the electron beam welding process is adopted for packaging and welding, the welding with large fusion depth can be completed under the condition of low heat input, the depth-to-width ratio of the obtained welding joint is large, the influence of the welding process on the tissue and the performance of the composite blank is reduced, welding materials are not needed, the welding energy consumption is reduced, and the cost control of industrial large-scale production is facilitated. Meanwhile, the effective fusion depth of welding is 30-40 mm, so that on one hand, the vacuum degree of a composite interface can be ensured, and on the other hand, the titanium steel composite blank is not cracked in the rolling process. In addition, by adopting the welding process of offsetting towards the 825 alloy side, the chemical components in the welding molten pool can be regulated and controlled, the martensite area of the joint tissue is avoided, the joint strength is ensured, and the crack sensitivity of the joint is reduced; the welding is carried out by adopting negative defocusing, so that ideal welding penetration and surface forming can be ensured, and the crack sensitivity of the joint is further reduced.
The rolling system that the single pass reduction rate is more than or equal to 10 percent, the first three pass reduction rate is more than or equal to 15 percent and the total reduction rate is more than or equal to 75 percent is adopted, so that the interatomic combination between the 825 alloy and the X70 low alloy steel can be ensured under the conditions of high temperature and high pressure, and the rolling compounding purpose is achieved. On the other hand, if blocky, granular impurities or brittle phases exist or are generated between composite interfaces, the materials can be broken under the action of large pressure and extension force to form discontinuous and fine particle distribution, and the composite quality and the performance stability are further ensured.
A rolling system under high pressure is adopted, temperature is controlled, and water cooling heat treatment is carried out, on one hand, austenite grains are recrystallized by the rolling temperature and the deformation process to obtain fully refined grains, and meanwhile, performance loss caused by mixed grains is avoided, the grains can be effectively refined under high pressure, austenite deformation is promoted, deformation energy is accumulated, and nucleation positions are increased; on the other hand, the ideal microstructure can be obtained by controlled cooling, so that the steel plate has proper strength, good plasticity and low-temperature toughness, and meanwhile, the weldability and the formability are excellent, and the requirement for manufacturing large-caliber oil and gas transmission pipelines is met.
Has the advantages that:
the 825/X70/825 double-sided nickel-based alloy composite plate produced according to the scheme has the following beneficial effects:
(1) the internal and external surfaces of the 825/X70/825 double-sided nickel-based alloy composite plate prepared by the method are 825 alloys, the corrosion resistance is qualified, and the 825/X70/825 double-sided nickel-based alloy composite plate is suitable for environments with high corrosion media inside and outside; the core part is X70 low alloy steel which has higher structural performance, the tensile strength is more than 620MPa, the yield strength is more than 520MPa, the yield ratio is less than 0.92, the elongation is more than 27 percent, the impact energy at the temperature of minus 20 ℃ is far more than 190J, the production process is simple, and the economic cost is low. The produced composite board with the thickness of 5-70 mm integrates the performance characteristics of two materials, and is suitable for manufacturing pipelines which have high corrosion resistance requirements on materials on the inner side and the outer side and give consideration to the mechanical property of the whole structure at the same time when oil well pipes, air pipes and the like are buried underground deeply in the oil and gas exploitation industry and are in high-temperature high-pressure high-corrosion environments.
(2) The assembly packaging welding process has small hot cracking tendency and high welding joint performance, and can ensure that the composite blank does not crack in the rolling process and the surface to be compounded is in a high vacuum environment.
(3) The rolling process has good rolling effect, can ensure that the 825 alloy and the X70 steel form metallurgical bonding, has good rolled plate shape, does not need to be straightened, and has the yield of more than 98 percent.
(4) The 825/X70/825 double-sided nickel-based alloy composite plate prepared by the invention has large plate width which can reach 3mm, the thickness can reach 70mm, the structures and the performances of the base layer and the composite layer are stable, the mechanical property of the composite interface is excellent, the shearing strength of the composite interface is more than 450MPa, the bonding rate of the composite surface is 100%, and the 825 alloy composite layer is qualified by intercrystalline corrosion resistance inspection.
Drawings
Fig. 1 is a schematic diagram of 825/X70/825 double-sided nickel-based alloy composite plate, which is composed of 825 alloy, X70 low alloy steel and 825 alloy from top to bottom in sequence.
Detailed Description
The following examples are intended to illustrate the invention in detail, and are intended to be a general description of the invention, and not to limit the invention.
Table 1 shows the actual material and raw material specifications of the X70 low alloy steel for the composite plate according to the embodiment of the present invention; table 2 shows the actual material and material specification of 825 alloy of the composite plate according to the embodiment of the present invention; table 3 shows the assembly welding system of the composite board and the related information of the composite board according to the embodiment of the present invention; table 4 shows the pre-rolling process and related information of the composite slab in the embodiment of the present invention; table 5 shows the rolling schedule of the examples; table 6 results of testing the properties of the composite board material object according to the embodiment of the present invention.
Table 1 practical material and raw material specifications for composite sheet X70 low alloy steel substrate
Figure BDA0001439936260000091
TABLE 2 actual materials and raw material specifications for the alloy of EXAMPLE 825
Figure BDA0001439936260000101
Table 3 example assembly welding system for composite panel and related information of composite blank
Figure BDA0001439936260000102
TABLE 4 Pre-Rolling Process of composite blanks and related information
Figure BDA0001439936260000103
TABLE 5 examples Rolling schedule
Figure BDA0001439936260000104
Table 6 physical property test results of the composite board according to the embodiment of the present invention
Figure BDA0001439936260000111
The embodiment shows that the 825/X70/825 double-sided nickel-based alloy composite plate produced by the production method has the tensile strength of more than 620MPa, the yield strength of more than 520MPa, the yield ratio of less than 0.92, the elongation of more than 27 percent, the shear strength of a composite interface of more than or equal to 454MPa, the impact power of X70 at minus 20 ℃ of more than 190J, the bending inspection is qualified, the bonding rate of the composite surface is 100 percent, the intergranular corrosion inspection of the 825 alloy is qualified, the inner surface and the outer surface have excellent corrosion resistance, and the whole has higher mechanical property.

Claims (3)

1. The production method of the 825/X70/825 double-sided composite board comprises a base material layer and a composite layer, and is characterized in that the base material layer is X70 low alloy steel, and the chemical components in percentage by mass are as follows: c% is less than or equal to 0.08%, Si 0.18-0.25%, Mn 1.59-1.75%, S is less than or equal to 0.003%, P is less than or equal to 0.02%, Nb 0.03-0.07%, Ti 0.01-0.025%, Mo 0.06-0.15%, Cr 0.1-0.2%, Ni is less than or equal to 0.12%, Al 0.025-0.045%, and the balance of Fe and inevitable impurities; the composite layer is 825 alloy, and the chemical components in percentage by mass are as follows: less than or equal to 0.02 percent of C, 0.20-0.5 percent of Si, 19.8-22.5 percent of Cr, 39.6-42.0 percent of Ni, 2.5-3.5 percent of Mo, less than or equal to 0.8 percent of Mn, 1.8-3.0 percent of Cu, 0.7-1.0 percent of Ti, less than or equal to 0.015 percent of S, less than or equal to 0.03 percent of P, more than or equal to 22 percent of Fe, and the balance of inevitable impurities;
the composite plate is formed by rolling a composite blank, wherein the composite blank comprises an X70 low-alloy steel base material and an 825 alloy composite material, the length of the base material is 2-4 m, the width of the base material is 1-3 m, and the thickness of the base material is 16-140 mm; the length and the width of the composite material are the same as those of the base material, and the thickness of the composite material is 8-70 mm; the base material is one of a continuous casting blank, an intermediate blank and a plate, the composite material is a plate, and the thickness ratio of the base material to the composite material is 3.3-6; the method comprises the following specific steps:
(1) selecting the X70 low-alloy steel base material and the 825 alloy composite material as assembly raw materials;
(2) machining the surfaces to be compounded of the X70 low-alloy steel base material and the 825 alloy composite material, wherein the machining depth is 3-5 mm, the flatness is ensured, and a rust layer and an oxide layer on the surface to be compounded are removed;
(3) degreasing and purging the machined surface;
(4) two 825 alloy plate composite materials and one X70 low alloy steel base material processed surfaces are opposite, and the 825 alloy plate, the X70 low alloy steel and the 825 alloy plate are sequentially stacked from top to bottom to form a composite blank;
(5) grinding the surfaces of 30-50 mm on two sides of a gap formed between an X70 low-alloy steel base material and an 825 alloy composite material in the composite blank to remove a rust layer, an oxidation layer and grease;
(6) vacuum electron beam sealing welding is carried out after the composite blank is sent into a vacuum chamber for vacuum pumping, and the vacuum degree is 2.4 multiplied by 10-2~4.5×10-2Pa; the effective penetration of vacuum electron beam sealing welding is 30-40 mm, the focus position deviates 1-3 mm from 825 alloy, and the defocusing amount is-2 to-4 mm;
(7) heating the composite blank subjected to vacuum electron beam sealing welding to 1200-1240 ℃ for heat preservation, wherein the heat preservation time is calculated according to 1min/mm multiplied by the total thickness of the composite blank, the initial rolling temperature is 1180-1200 ℃, the single-pass reduction rate is more than or equal to 10%, the first three-pass reduction rate is more than or equal to 15%, the total reduction rate is more than or equal to 75%, the final rolling temperature is 760-830 ℃, the initial cooling temperature is 740-795 ℃, and the water cooling temperature is 450-550 ℃;
(8) and trimming the rolled composite plate to obtain a finished product 825/X70/825 double-sided composite plate.
2. The method for producing a 825/X70/825 double-sided composite board as claimed in claim 1, wherein the thickness of the composite board is in the range of 5 to 70 mm.
3. The method for producing a 825/X70/825 double-sided composite board as claimed in claim 1, wherein the machining is planing + grinding or milling + grinding.
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