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A method for improving composite heat treatment of nickel-based alloy pipe

A composite heat treatment and nickel-based alloy technology, applied in the direction of metal material coating process, coating, solid-state diffusion coating, etc., can solve the problem of shortening the service life of nickel-based alloy tubes, low strength and comprehensive mechanical properties, and anti-oxidation performance Insignificant and other problems, to achieve excellent solid solution effect, shorten the process cycle, shorten the effect of solid solution treatment time

Active Publication Date: 2016-03-30
CHANGZHOU SHENGTAK SEAMLESS STEEL TUBE
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  • Description
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AI Technical Summary

Problems solved by technology

The γ' phase, M23C6, and M6C precipitates cannot be obtained only by solution treatment, so the strength and comprehensive mechanical properties are low
Although solid solution treatment plus aging treatment can obtain ideal precipitated phases, this heat treatment method faces the characteristics of long aging and serious energy consumption
In addition, solution treatment or solution treatment plus aging treatment can only improve the mechanical properties of nickel-based alloys, and the effect on the oxidation resistance of nickel-based alloys at high temperatures is not significant. It is used in ultra-supercritical thermal power units. When the high temperature corrosion phenomenon is serious, the service life of the nickel-based alloy tube is greatly shortened

Method used

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Examples

Experimental program
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Effect test

Embodiment 1）

[0025] A method for improving the composite heat treatment of nickel-based alloy pipes, comprising the steps of:

[0026] 1) Pre-heat treatment: it is divided into four stages, including solution treatment, intermediate treatment and two aging treatments; the solution treatment temperature is 1150°C, the solution treatment time is 2h, and water mist is cooled after solution treatment; the middle The treatment temperature was 980°C for 5 hours, air cooling; the primary aging treatment temperature was 843°C, the primary aging treatment time was 24 hours, and air cooling; the secondary aging treatment temperature was 760°C, and the secondary aging treatment time was 16 hours, air cooling.

[0027] 2) Surface treatment: The surface treatment of the present invention is ionic Al-B co-infiltration, including the following steps:

[0028] (1) Pretreatment: Clean the nickel-based alloy tubes that have undergone previous heat treatment in NaOH solution to remove oil stains on the surfa...

Embodiment 2）

[0035] A method for improving the composite heat treatment of nickel-based alloy pipes, comprising the steps of:

[0036] 1) Pre-heat treatment: it is divided into four stages, including solution treatment, intermediate treatment and two aging treatments; the solution treatment temperature is 1200°C, the solution treatment time is 1.5h, and water mist is cooled after solution treatment; The intermediate treatment temperature is 1020℃, the time is 4h, air cooling; the primary aging treatment temperature is 843℃, the primary aging treatment time is 24h, air cooling; the secondary aging treatment temperature is 760℃, the secondary aging treatment time is 16h, air cooling .

[0037] 2) Surface treatment: The surface treatment of the present invention is ionic Al-B co-infiltration, including the following steps:

[0038] (1) Pretreatment: Clean the nickel-based alloy tubes that have undergone previous heat treatment in NaOH solution to remove the oil on the surface of the nickel-b...

Embodiment 3）

[0045] A method for improving the composite heat treatment of nickel-based alloy pipes, comprising the steps of:

[0046] 1) Preliminary heat treatment: it is divided into four stages, including solution treatment, intermediate treatment and two aging treatments; the solution treatment temperature is 1250°C, solution treatment time is 2h, water mist cooling after solution treatment; intermediate The treatment temperature was 1080°C for 5 hours, air cooling; the primary aging treatment temperature was 843°C, the primary aging treatment time was 24 hours, and air cooling; the secondary aging treatment temperature was 760°C, and the secondary aging treatment time was 16 hours, air cooling.

[0047] 2) Surface treatment: The surface treatment of the present invention is ionic Al-B co-infiltration, including the following steps:

[0048] (1) Pretreatment: Clean the nickel-based alloy tubes that have undergone previous heat treatment in NaOH solution to remove the oil on the surface...

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Abstract

The invention relates to the heat treatment field of the nickel-based alloy pipes, and in particular relates to a complex heat treatment method capable of improving a nickel-based alloy pipe. The complex heat treatment method comprises early-stage heat treatment and surface treatment, wherein the surface treatment comprises the steps of pretreatment, coating of a co-permeating agent, co-permeation of ions Al-B and the like. The early-stage heat treatment of the complex heat treatment method is capable of obtaining remarkable effect of dispersion strengthening so that the nickel-based alloy pipe can have excellent mechanical properties; Al-B co-permeation is realized by virtue of ion bombardment, and consequently, the heating temperature of the surface heat treatment of the nickel-based alloy pipe is greatly reduced in contrast with that of the co-permeation in the traditional high-temperature furnace and the permeation rate is remarkably increased in contrast with that of the traditional electrolytic method or high-temperature slurry; especially, the method is capable of effectively improving the properties of the nickel-based alloy pipe such as high-temperature creep resistance and corrosion resistance and thus greatly prolonging the service life of the nickel-based alloy pipe.

Description

technical field [0001] The invention relates to the field of heat treatment of nickel-based alloy pipes, in particular to a method for improving the composite heat treatment of nickel-based alloy pipes. Background technique [0002] The development of ultra-supercritical thermal power units puts forward higher requirements for high-temperature corrosion resistance, oxidation resistance and high-temperature mechanical properties of materials. At present, nickel-based alloys have been considered as one of the most suitable materials for seamless pipes for ultra-supercritical thermal power units. [0003] At present, the heat treatment methods for nickel-based alloys are usually only solution treatment or solution treatment plus aging treatment. The γ' phase, M23C6, and M6C precipitates cannot be obtained only by solution treatment, so the strength and comprehensive mechanical properties are low. Although solid solution treatment plus aging treatment can obtain ideal precipit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F17/00C22F1/10C23C12/02
Inventor 周文庆周益鑫范琪
Owner CHANGZHOU SHENGTAK SEAMLESS STEEL TUBE
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