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High-obdurability corrosion-resistant age hardening nickel-based alloy and direct ageing heat treatment method

A technology of aging heat treatment and aging strengthening, which is applied in the field of metal materials to achieve the effect of optimizing the balance of corrosion resistance, improving thermoplasticity, and reducing the tendency of hot cracking

Active Publication Date: 2014-04-23
CHONGQING MATERIALS RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, some studies have attempted to replace the solid solution and aging heat treatment process with direct aging heat treatment to shorten the process flow, improve production efficiency, and reduce energy consumption, but they have not yet been successful.

Method used

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  • High-obdurability corrosion-resistant age hardening nickel-based alloy and direct ageing heat treatment method
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Examples

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Effect test

example 1

[0037] Vacuum induction melting alloy 1000kg was used to cast it into a Φ220mm round bar, and then electroslag remelted into a Φ380mm steel ingot. The ingot number is K1151. The chemical composition of the alloy is shown in Table 1. After upsetting and drawing, a Φ230mm round bar is made. The bar is subjected to aging heat treatment, wire cutting sampling, and processing the sample to test its tensile properties, hardness and impact energy. The properties are shown in Table 2. The obtained alloy is used for downhole tools in Xinjiang oil and gas fields .

example 2

[0039] Vacuum induction melting alloy 1000kg was used to cast it into a Φ220mm round bar, and then electroslag remelted into a Φ400mm steel ingot. The ingot number is K1152. The chemical composition of the alloy is shown in Table 1. After upsetting and drawing, a Φ240mm round bar is made. The bar is subjected to aging heat treatment, wire cutting sampling, and processing of the sample to test its tensile properties, hardness and impact energy. The properties are shown in Table 2. The obtained alloy is used in the downhole of Chuandong Oil and Gas Field tool.

example 3

[0041] Vacuum induction melting alloy 3000kg, casting into Φ250mm round bar, and electroslag remelting into Φ400mm×3900mm steel ingot, steel ingot number is K1241, alloy chemical composition is shown in Table 1, and then placed in a high-temperature pit furnace for homogenization heat treatment , after being upset by the quick forging machine, drawing and opening the billet, and forging by the radial forging machine to make forgings of Φ280mm / 230mm, the forgings are subjected to aging heat treatment, wire cutting sampling, and processing samples to test their tensile properties, hardness and impact The work and properties are shown in Table 2. The obtained alloy is used for downhole pipeline hanger in a sour oil and gas field.

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Abstract

The invention relates to a high-obdurability corrosion-resistant age hardening nickel-based alloy, which is composed of Ni, Cr, Mo, Nb, Ti, Al, V, Zr, B, Mg, (Ti+Al) / Nb, C, Si and Fe. The alloy is obtained by a direct ageing heat treatment method. The alloy provided by the invention has the characteristics of high strength, good ductility and toughness, excellent corrosion resistance and the like just the same as those of the existing nickel-based corrosion-resistant alloy; and compared with the existing nickel-based corrosion-resistant alloy, the alloy provided by the invention is better in thermoplasticity, lower in hot processing difficulty and better in integrated processing properties, and also lower in process cost. The alloy provided by the invention can be used as the material of equipment for high temperature and high pressure high-sulfur oil and gas exploitation.

Description

technical field [0001] The invention relates to a metal material, in particular to a high-strength, corrosion-resistant, aging-enhanced nickel-based alloy and a direct aging heat treatment method. Background technique [0002] In addition to the matrix element nickel, nickel-based structural materials may also contain beneficial elements such as chromium and molybdenum. Nickel-based alloys can be divided into solid-solution strengthening and age-strengthening according to the strengthening method. The former can increase the strength through cold working, but cannot manufacture larger and complex parts. In contrast, age-strengthening alloys have no such restrictions, so It has been widely used in many important industrial fields. In terms of function, nickel-based alloys can be divided into two categories: superalloys and corrosion-resistant alloys. The former emphasizes the performance of high temperature oxidation resistance, high temperature durability and high temperat...

Claims

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Application Information

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IPC IPC(8): C22C19/05C22F1/10
Inventor 王东哲刘海定陈登华李永友吴畏张楠万红丁敏祁宏
Owner CHONGQING MATERIALS RES INST
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