Manufacturing method of high-precision outer-hexagonal inner-circle special-shaped section seamless tube for nuclear power

Abstract

The invention discloses a high-precision outer-hexagonal inner-circle special-shaped section seamless tube for nuclear power, which is characterized in that the seamless tube is made of stainless steel or corrosion-resistant alloy with the elongation percentage of more than 35%; the outer opposite edge distance is 10 mm-68 mm, and the deviation of the outer opposite edge distance is + / -0.05 mm; and the diameter of the inner circle is 9 mm-66 mm, and the deviation of the diameter of the inner circle is + / -0.05 mm. The invention further discloses a preparation method of the high-precision outer-hexagonal inner-circle special-shaped section seamless tube for nuclear power.

Description

technical field [0001] The invention relates to a high-precision outer hexagonal inner circle special-shaped cross-section seamless pipe for nuclear power and a manufacturing method thereof, belonging to the technical field of preparation of special alloy special-shaped cross-section seamless pipes in new materials. Background technique [0002] The traditional outer hexagonal inner circle seamless pipe manufacturing process adopts multi-pass cold rolling plus multi-pass cold drawing forming, or adopts thermal processing technology to set the shape and multi-pass cold drawing to determine the size. Many, low production efficiency, and low dimensional accuracy of the produced products cannot meet the production needs of high-precision outer hexagonal and inner circular tubes. [0003] In the prior art, the patent application with the publication number CN112692065A discloses a high-strength thin-walled stainless steel hexagonal seamless pipe and its manufacturing method. Aft...

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Problems solved by technology

[0004] It is limited to the manufacturing technology of hexagonal seamless pipes with equal wall thickness inside and outside the large diameter. The patented technology of this application has the following problems for the manufacture of high-precision outer hexagonal and inner circular stainless steel seamless pipes mentioned in this patented technology: The manufacturing method disclosed in this prior art is limited to the manufacture of large-diameter hexagonal pipes, and the size and dimensional accuracy control of small-diameter hexagonal pipes cannot be implemented using this method; the seamless pipe disclosed in this prior art is deformed from a circular pipe to For hexagonal tubes, the wall thickness on the same section is equal, and the deformation amount is less than 15%, and it can be formed. However, the manufacturing deformation amount of hexagonal tubes with unequal walls is large, and the deformation amount is too small. Insufficient deformation will affect the final The size and precision of the product; in addition, the final product of the seamless pipe is cold without heat treatment. For some hexagonal pipes used in high temperature environments, the pipe will be deformed, thus affecting the dimensional accuracy

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