Manufacturing method of thin-walled large-diameter pipe with high-pressure copper-nickel alloy for marine engineering

A copper-nickel alloy and marine engineering technology, which is applied in the field of manufacturing thick-walled medium-high pressure copper-nickel alloy large-diameter pipes for liquefied natural gas transmission in marine engineering, can solve the problems of not being able to produce thick-walled large-diameter copper-nickel alloy pipes, etc. Achieve the effect of eliminating residual stress, eliminating processing stress and improving tensile strength

Active Publication Date: 2020-02-18
江阴和宏精工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] None of the above processes can produce ideal thick-walled and large-diameter copper-

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] In this embodiment, the manufacturing method of the super-heavy thick-walled large-diameter medium-high pressure copper-nickel alloy pipe for marine engineering, the specification is that the outer diameter of the pipe is 324mm×the wall thickness is 12.7mm, and the copper-nickel alloy pipe with a length of 6m has a single weight of 665 kg. , Yield strength not less than 125MPa. Its preparation steps are as follows:

[0022] (1) Using copper with a purity of more than 99% and nickel with a purity of more than 99% as raw materials, the alloy melt is smelted in a vacuum induction heating furnace. During the smelting process, electromagnetic stirring is used to continuously vacuumize; the semi-continuous casting process is used to cast the diameter D is a solid round billet of 460mm;

[0023] (2) Boring: the round billet is cooled to normal temperature, and the center of the solid round billet is bored, the diameter of the inner hole is 40 mm, and the inner hole is axially...

Embodiment 2

[0031] In this embodiment, the manufacturing method of super-heavy copper-nickel alloy medium-high pressure pipes for marine engineering, the specification is that the outer diameter of the pipe is 368mm×the wall thickness is 12.7mm, the copper-nickel alloy pipe is 6m long, the weight of a single piece is 758 kg, and the yield strength is not low At 125MPa. Its preparation steps are as follows:

[0032] (1) Using copper with a purity of more than 99% and nickel with a purity of more than 99% as raw materials, the alloy melt is smelted in a vacuum induction heating furnace. During the smelting process, electromagnetic stirring is used to continuously vacuumize; the semi-continuous casting process is used to cast the diameter D is a solid round billet of 460mm;

[0033] (2) Boring: the round billet is cooled to normal temperature, and the center of the solid round billet is bored. The diameter of the inner hole is 60 mm, and the inner hole is axially penetrated for centering; ...

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Abstract

The invention relates to a manufacturing method of a thin-walled large-diameter pipe with high-pressure copper-nickel alloy for marine engineering. The manufacturing method comprises the following steps: (1), performing semi-continuous casting on copper and nickle as raw materials to obtain a copper-nickel alloy solid round billet; (2), performing boring: boring in the center of the copper-nickelalloy solid round billet to obtain an inner hole which can penetrate through the center of the copper-nickel alloy solid round billet in the axial direction; (3), performing reaming: heating a billetmaterial, controlling the outside diameter to be invariable, and reaming the inner hole by 3.5 times to 7 times; (4), performing hot extrusion: carrying out water sealing and extrusion on the billet material into hot extrusion pipe in a way of matching with an extrusion module and extruding a steel pipe in the radial direction and in the axial direction, enabling a discharging end of the extrusionmodule to be directly in abutting joint with a water sealing tank, and directly immersing a pipe billet subjected to hot extrusion molding into water to ensure that the pipe billet is isolated from the air so as to prevent oxidation, removing a surface layer of the pipe billet subjected to hot extrusion, and eliminating surface defects; (5), performing straightening: straightening the pipe billetsubjected to hot extrusion; (6), stretching or cold-rolling the pipe billet in several times until a final specification of the pipe billet is obtained, and carrying out annealing after stretching orcold rolling is performed every time; (7) shaping; and (8) performing formation and thermal treatment.

Description

technical field [0001] The invention belongs to the technical field of manufacturing copper-nickel alloy pipes, and in particular relates to a method for manufacturing thick-walled medium-high pressure copper-nickel alloy large-diameter pipes for marine engineering liquefied natural gas (LNG) transmission. Background technique [0002] Copper-nickel alloy has high mechanical properties and corrosion resistance, and has good press workability in hot and cold states. Copper-nickel alloys are widely used in marine engineering as medium and high pressure pipes. A certain wall thickness is an effective guarantee for medium and high pressure pipes. It is difficult to realize the production of large-diameter thick-walled copper-nickel alloy main pipes through traditional processes. Only by improving the manufacturing method of copper-nickel alloy pipes can the thick-walled large-diameter seamless pipe main pipes be guaranteed. production. [0003] The patent document with the not...

Claims

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Application Information

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IPC IPC(8): B21C37/06
CPCB21C37/06
Inventor 胡汉全文继有陈华胡天明何凯黄丽刚
Owner 江阴和宏精工科技有限公司
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