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Low-nickel aging strengthening type iron-nickel based corrosion resistant alloy and preparation method thereof

A technology of age-strengthening and corrosion-resistant alloys, which is applied in the field of metal materials, can solve problems such as no significant breakthroughs, and achieve the effects of excellent overall process performance, reduced tendency of hot cracking, and strong resistance to stress corrosion cracking

Active Publication Date: 2015-03-25
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 heat treatment process requiring more than two steps with direct aging heat treatment to shorten the process flow, improve production efficiency, and reduce energy consumption, but no significant breakthrough has been made

Method used

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  • Low-nickel aging strengthening type iron-nickel based corrosion resistant alloy and preparation method thereof
  • Low-nickel aging strengthening type iron-nickel based corrosion resistant alloy and preparation method thereof
  • Low-nickel aging strengthening type iron-nickel based corrosion resistant alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] 500kg of alloy was melted by vacuum induction, casted into a round bar of Φ170mm, and then electroslag remelted into a steel ingot of Φ280mm. The ingot number is N73. The chemical composition of the alloy is shown in Table 1. The steel ingot is placed in a high-temperature well-type furnace for homogenization heat treatment, and then forged into a Φ100mm round bar. The bar is subjected to aging heat treatment, wire cutting sampling, and processed samples to test its tensile properties, hardness and impact energy. The properties are shown in the table 2. The material is used for downhole tools in oil and gas fields.

Embodiment 2

[0044] 1000kg of alloy was melted by vacuum induction, cast into a round rod of Φ220mm, and remelted into a steel ingot of Φ380mm by electroslag remelting. The ingot number is N74. The chemical composition of the alloy is shown in Table 1. The steel ingot is placed in a high-temperature well-type furnace for homogenization heat treatment, and then forged into a Φ200mm round bar by upsetting and drawing. The properties are shown in Table 2. This material is used for downhole tools in oil and gas fields.

Embodiment 3

[0046] 3000kg of alloy was melted by vacuum induction, cast into a round bar of Φ250mm, and remelted into a steel ingot of Φ400mm by electroslag remelting. The ingot number is N75. The chemical composition of the alloy is shown in Table 1. The steel ingot is placed in a high-temperature well-type furnace for homogenization heat treatment, and the billet is made into a Φ230mm bar through a quick forging machine for upsetting and drawing, and a radial forging machine is forged, and the bar is then hot-extruded into a thick-walled tube , the pipe is subjected to aging heat treatment, wire cutting sampling, and processing samples to test its tensile properties, hardness and impact energy. The properties are shown in Table 2. This material is used for downhole pipelines in sour oil and gas fields.

[0047] 2. Alloy properties

[0048] 1. Effect of heat treatment on alloy mechanical properties and alloy structure

[0049] The mechanical properties at room temperature of the alloy d...

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Abstract

The invention relates to a low-nickel aging strengthening type iron-nickel based corrosion resistant alloy. The alloy is prepared from the following components in percentage by weight: 36.0-42.0 percent of Ni, 19.0-25.0 percent of Cr, 3.0-6.0 percent of Mo, 1.0-3.50 percent of Cu, 1.5-3.0 percent of Ti, 0.2-0.6 percent of Al, less than or equal to 0.5 percent of Nb, less than or equal to 0.03 percent of C, less than or equal to 0.5 percent of Si, less than or equal to 0.5 percent of Mn, less than or equal to 0.0010 percent of S, less than or equal to 0.005 percent of P, 0.01-0.6 percent of trace elements and the balance of Fe. The alloy has high strength, high toughness and high corrosion resistance of existing iron-nickel based alloy. Compared with existing iron-nickel based alloy, the alloy has the advantages of better thermal processing performance and lower cost.

Description

technical field [0001] The invention relates to a metal material, in particular to a low-nickel aging-strengthened iron-nickel-based corrosion-resistant alloy and a preparation method thereof. Background technique [0002] In addition to the matrix element nickel, nickel-based structural materials usually contain beneficial elements such as chromium, molybdenum, niobium, tungsten, copper, iron, titanium and aluminum, which can be used as high-temperature alloys or corrosion-resistant alloys. Because the nickel content of the nickel-based alloy is very high, the mass fraction is greater than 50%, or even as high as 80%, so the material cost is relatively high, which has a certain negative impact on large-scale popularization and application. On the other hand, because the nickel content in the alloy is too high, the thermoplasticity is poor, the high-temperature deformation resistance is large, and the temperature zone suitable for deformation is narrow, so the processing is ...

Claims

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Application Information

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IPC IPC(8): C22C30/02C22C38/50C22C38/54C22C19/05
CPCC22C19/05C22C30/02C22C38/42C22C38/44C22C38/48C22C38/50C22C38/54
Inventor 王东哲刘海定黄国平李永友祁宏万红张楠
Owner CHONGQING MATERIALS RES INST
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