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Preparation method of corrosion-resistant alloy powder and parts for deep-sea Christmas trees

A technology of deep-sea Christmas trees and corrosion-resistant alloys, which is applied in the field of deep-sea corrosion-resistant alloys. It can solve the problems of loose pores, difficult control of mechanical properties, high segregation of corrosion-resistant alloy parts, and unstable corrosion resistance. Effect of no void defect and improved corrosion resistance

Active Publication Date: 2020-08-25
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the deficiencies in the above-mentioned prior art and provides a method for preparing corrosion-resistant alloy powder and components for deep-sea Christmas trees. Unstable corrosion, long process, difficult control of loose pores and decline in mechanical properties, etc., greatly improve the corrosion resistance, mechanical properties and reliability of alloys, while reducing costs, and realize the preparation of high-quality corrosion-resistant alloy parts for deep-sea oil trees. Provide support for my country's high-end deep-sea marine engineering materials

Method used

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Examples

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Effect test

preparation example Construction

[0025] The preparation method of the corrosion-resistant alloy and components for the deep-sea oil tree comprises the following specific steps:

[0026] Step 1. Vacuum induction melting is used to prepare a corrosion-resistant alloy master alloy ingot, carbide and γ′ precipitation strengthening phase are eliminated, and the addition of C, Al and Ti elements is zero;

[0027] Step 2, remelting the master alloy ingot, and preparing corrosion-resistant alloy powder by means of atomization and pulverization in an argon atomization pulverization furnace;

[0028] Step 3: Sieve the prepared corrosion-resistant powder into a required particle size range through a mechanical vibrating sieve; the powder particle size range is 1-355 μm.

[0029] Step 4, the sieved corrosion-resistant alloy powder is vibrated, degassed, sealed and welded in a stainless steel sheath;

[0030] Step 5. Determine the hot isostatic pressing process parameters through the combination of differential thermal a...

Embodiment 1

[0033] The concrete steps of adopting the technical solution of the present invention are as follows:

[0034] (1) Do not add C, Al, Ti elements to cancel the carbide and γ′ precipitation strengthening in the alloy, and prepare the corrosion-resistant alloy master alloy ingot by vacuum induction melting, the composition is Ni-24.0%Cr-5.6%Mo-2.4% Nb(at.%);

[0035] (2) Remelt 150kg ingot of master alloy, and prepare corrosion-resistant alloy powder by means of argon atomization and pulverization in an atomization pulverization furnace. The powder was detected by synchrotron radiation XRD and no strengthening phases such as carbide and Υ' were found;

[0036] (3) Sieve the prepared corrosion-resistant powder through a mechanical vibrating sieve, and the particle size range is <100 μm;

[0037] (4) The sieved -3 Pa), sealed and welded in a stainless steel sheath;

[0038] (5) The hot isostatic pressing parameters of the alloy are determined to be 1120°C / 140MPa / 3h by means of a ...

Embodiment 2

[0041] The concrete steps of adopting the technical solution of the present invention are as follows:

[0042] (1) Do not add C, Al, Ti elements to cancel the carbide and γ′ precipitation strengthening in the alloy, and prepare the corrosion-resistant alloy master alloy ingot by vacuum induction melting, the composition is Ni-24.0%Cr-5.6%Mo-2.4% Nb(at.%);

[0043] (2) Remelting 150kg of the master alloy ingot, and preparing corrosion-resistant alloy powder by means of atomization and pulverization, the powder was detected by synchrotron radiation XRD and no precipitation strengthening phases such as carbide and Υ' were found;

[0044] (3) The prepared corrosion-resistant powder will be sieved through a mechanical vibrating sieve, and the particle size range is 100-150 μm;

[0045] (4) The sieved 100-150 μm particle size corrosion-resistant alloy powder is passed through vibration, degassing (vacuum degree 10 -3 Pa), sealed and welded in a stainless steel sheath;

[0046] (5...

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Abstract

The invention belongs to the technical field of deep-sea corrosion-resistant alloys, and specifically relates to a preparation method of corrosion-resistant alloy powder and parts for deep-sea Christmas trees. Carbides and aging strengthening mechanisms are eliminated through alloy composition control, thus, the heat treatment process is omitted so as to shorten the process and reduce the cost, and meanwhile the formation of harmful original particle boundaries is reduced; atomized pulverizing and a hot isostatic pressing direct forming process are used for eliminating element segregation andloosening hole defects, and thus, the corrosion resistance and the mechanical properties are improved; a method of combining differential thermal analysis and fast powder fused testing is used for accurately determining hot process parameters; the corrosion resistance, mechanical properties and reliability of the alloy are substantially improved; meanwhile the cost is reduced; and the preparationmethod realizes the preparation of HH-level high-quality corrosion-resistant alloy parts for the deep-sea Christmas trees and provides support for materials for high-end deep-sea marine engineering inChina.

Description

technical field [0001] The invention belongs to the technical field of deep-sea corrosion-resistant alloys, and in particular relates to a preparation method of corrosion-resistant alloy powder and components for deep-sea oil trees. Background technique [0002] With the rapid development of the national economy and national defense industry, the contradiction of energy supply has become increasingly prominent, and ensuring oil supply has become a necessary condition for national security and economic development. At present, domestic onshore oil resources are approaching saturation after years of exploitation, while oceans are extremely rich in oil and gas resources, of which 70% of the undeveloped resources are stored in deep water areas. Therefore, the development of my country's marine resources and the exploitation of oil and gas fields must gradually develop in the direction of deep wells and high-corrosion environments. As the service environment becomes more and mor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/08B22F3/15C22C1/04C22C19/05
CPCB22F9/082B22F3/15C22C1/0433C22C19/055
Inventor 郑亮张国庆刘杨李周
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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