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High-temperature alloy thin-diameter thin-wall capillary and preparation method thereof

A high-temperature alloy and capillary technology, which is applied in the field of metal processing, can solve the problem that the preparation process cannot meet the requirements, and achieve the effects of uniform performance, reduced wall thickness and improved heat exchange efficiency.

Active Publication Date: 2019-05-21
江苏隆达超合金股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to obtain a capillary with higher heat transfer efficiency, the size and preparation process of the current GH4169 superalloy capillary obviously cannot meet the demand

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A GH4169 superalloy thin-diameter thin-wall capillary Φ0.9*0.05mm, the preparation of the capillary includes the following steps:

[0023] (1) Melting: prepare materials, and use a vacuum induction furnace to melt at 1400°C to obtain a solution, then continue refining for 20 minutes, and cast electrode rods. The outer diameter of the electrode ingot is Φ120~130mm. The composition of the ingot is: wt%, Ni52.24%, Cr 19.58%, Mo 3.08%, Nb 5.08%, Al 0.7%, Ti 1.0%, O 0.0009%, N 0.0038%, S0.0011%, P 0.0019%; the rest is Fe. Then go through electroslag remelting in argon protective atmosphere, the amount of slag is 5Kg, and the slag is CaF 2 :Al 2 o 3 : CaO = 70%: 15%: 15%, to obtain GH4169 superalloy electroslag ingot Φ180mm.

[0024] (2) Hot forging: Diffusion annealing of the GH4169 high temperature alloy electroslag ingot obtained in step (1), first slowly heated to 1180°C, kept for 18h, then lowered to the forging temperature of 1120°C, and hot forged into Φ70mm in the...

Embodiment 2

[0031] A GH4169 superalloy thin-diameter thin-wall capillary Φ0.8*0.06mm, the preparation of the capillary includes the following steps:

[0032] (1) Melting: prepare materials, use a vacuum induction furnace to melt at 1500°C to obtain a solution, then continue refining for 10 minutes, and cast electrode rods. The outer diameter of the electrode ingot is Φ120~130mm. The composition of the ingot is: wt%, Ni52. 27%, Cr 19.19%, Mo 3.13%, Nb 5.24%, Al 0.71%, Ti 0.88%, O 0.0008%, N 0.0030%, S0.0012%, P 0.0016%, and the rest is Fe. After electroslag remelting in an argon protective atmosphere, the GH4169 superalloy electroslag ingot Φ180mm is obtained;

[0033] (2) Hot forging: Diffusion anneal the GH4169 superalloy electroslag ingot obtained in step (1), first slowly heat it to 1180°C, keep it warm for 18h, then lower it to the forging temperature of 1120°C, and hot forge it into a diameter in the temperature range of 1120-1000°C Φ70mm bar;

[0034] (3) Drilling: the GH4169 supe...

Embodiment 3

[0041] A GH4169 superalloy fine-diameter thin-walled capillary Φ0.86*0.03mm. The specific steps for preparing the capillary are as follows:

[0042] (1) Melting: prepare materials, the proportion of the formula is the same as in Example 2, use a vacuum induction furnace to melt at 1450°C to obtain a solution, then continue refining for 15 minutes, pour electrode rods, and then undergo electroslag remelting in an argon protective atmosphere to obtain GH4169 high temperature Alloy electroslag ingot;

[0043] (2) Hot forging: Diffusion anneal the GH4169 superalloy electroslag ingot obtained in step (1), first slowly heat it to 1180°C, keep it warm for 18h, then lower it to the forging temperature of 1120°C, and hot forge it into a rod in the temperature range of 1120-1000°C material;

[0044] (3) Drilling: the GH4169 superalloy rod obtained in step (2) is machined and drilled to obtain a GH4169 superalloy waste tube;

[0045] (4) Preparation of semi-finished products: The GH416...

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Abstract

The invention relates to a high-temperature alloy small-diameter and thin-wall capillary tube and a preparation method thereof and belongs to the technical field of metal processing. The small-diameter and thin-wall capillary tube material is a GH4169 high-temperature alloy which comprises the following components in percentages by mass: 17-21% of Cr, 50-55% of Ni, 2.8-3.3% of Mo, 4.75-5.50% of Nb, 0.20-0.80% of Al, 0.65-1.15% of Ti, less than or equal to 0.1% of impure elements and the balance of Fe; the dimensions of the capillary tube are as follows: the outer diameter phi is 0.8-1.5mm andthe wall thickness is 0.03-0.08mm. The wall thickness dimension of the GH4169 high-temperature alloy small-diameter and thin-wall capillary tube is only 0.03-0.08mm. As a heat exchange part, the heatexchange efficiency can be improved greatly. By means of a method of combining metal plastic forming and machining, the bottleneck of plastically machining the hard-to-deform high-temperature alloy isbroken through, so that the wall thickness dimension of the capillary tube can be further reduced, the dimensional precision of the capillary is improved, and the small-diameter and thin-wall capillary tubes which are uniform in performance are obtained.

Description

technical field [0001] The invention relates to a high-temperature alloy thin-diameter thin-walled capillary and a preparation method thereof, belonging to the technical field of metal processing. Background technique [0002] GH4169 superalloy is a precipitation-hardenable nickel-based superalloy strengthened by Al, Ti and Nb. The alloy has high yield strength, tensile strength, toughness, plasticity, fatigue life and creep resistance in the temperature range of 650 °C. . GH4169 superalloy capillary tube is used as the cooling tube of heat exchanger, which is widely used in aerospace industry, solar energy and nuclear power generation industry. The wall thickness of the capillary directly affects the heat transfer efficiency of the heat exchanger. The thinner the wall thickness, the higher the heat transfer efficiency. The GH4169 superalloy is a hard-to-deform alloy. The current manufacturing process of the capillary is rolling and drawing, and the minimum wall thickness ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/05C22F1/10
CPCC22C19/055C22C19/056C22F1/10
Inventor 周小红周向东翁祥金
Owner 江苏隆达超合金股份有限公司
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