A kind of 825/x70/825 double-sided composite board and its production method

Abstract

The invention discloses an 825 / X70 / 825 double-sided composite board and a production method thereof. The composite billet for manufacturing composite panels includes X70 low-alloy steel base material and 825 alloy composite material. The length and width of the base material and the composite material are the same, and the length is 2-4m, the width is 1-3m, and the thickness ratio is 2-10; Composite material, base material, and composite material are sequentially stacked on the machined composite material and base material to form a composite billet. The composite billet is vacuumed and vacuum electron beam sealed and welded; the welded composite billet is heated to 1200-1250 ℃ heat preservation, rolling start temperature is 1180~1200℃, single-pass reduction rate≥10% and first three-pass reduction rate≥15%, total reduction rate≥75%; 5~70mm composite plate is included The outer side has excellent corrosion resistance and the core has excellent mechanical properties. It is suitable for the manufacture of pipelines that require high corrosion resistance on both the inner and outer sides while taking into account the mechanical properties of the overall structure.

Description

technical field [0001] The invention belongs to the technical field of composite board preparation, and in particular relates to a vacuum composite technology to produce 825 / X70 / 825 double-sided composite board and a preparation method thereof. Background technique [0002] in H 2 S and CO 2 Under coexistence conditions, metal materials face two corrosion problems: one is the environmental cracking performance of the material, and the other is the electrochemical corrosion of the material. Many gas fields located in the Sichuan area of ​​China have high H content 2 S, CO 2 , the content of chloride ions in the water of gas fields is also high, and the exploitation of these gas fields faces severe corrosion challenges. For deep-buried oil well pipes and gas pipes, not only will they be corroded by oil and gas on the inner wall of the pipeline, but they will also face the threat of external high temperature, high pressure, and highly corrosive environments. In order to en...

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Problems solved by technology

However, the specifications and sizes of the composite boards produced are greatly restricted, and the stability of the composite performance is poor.

[0006] CN105671424A discloses a nickel-based alloy clad steel plate for pipelines and a manufacturing method thereof. The nickel-base alloy clad steel plate for pipelines is prepared by rolling, but its clad interface strength is limited and cannot meet the current increasingly higher requirements for clad strength; CN104801562A discloses a production method for producing steel nickel / nickel-based alloy composite blanks, and introduces a method for preparing composite blanks for nickel-based alloy composite plates by rolling, which has strong adaptability to equipment, but its production Low efficiency, complex process, low yield and high cost

Although the process difficulty of the above-mentioned technologies is low, the quality of the prepared composite panels is poor, and the performance of the base material and composite materials cannot be guaranteed

[0009] CN104759842A discloses a production method of stainless steel double-sided composite board and roll, and CN104624702A discloses a preparation method of stainless steel double-sided composite board, both of which are prepared by first preparing a single-sided stainless steel composite board and then compounding it twice Although the product quality of double-sided stainless steel composite panels is better than that required by GB / T8566-2008, the process is highly complicated and the steps are cumbersome, so it is not suitable for mass industrial production

[0010] CN106269961A discloses a stainless steel double-sided composite board for containers and its manufacturing method. The double-sided stainless steel composite board is prepared by vacuum electron beam packaging and hot rolling technology, but the field of use is for containers, and the carbon content is low, 0.051 %~0.143%, unable to meet the current requirements for higher and higher strength of oil and gas pipeline materials

On the one hand, the size and specifications of the double-sided stainless steel clad plates prepared by the explosion method used in the two papers are limited by the process; on the other hand, due to the second side compounding, the microscopic defects and stress on the first side composite bonding interface will increase. , resulting in low composite interface shear performance and poor stability

[0012] To sum up, at present, there are few developments in the preparation technology of double-sided composite panels, and the development of related technologies for double-sided nickel-based alloy composite panels is even blank.

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