A novel high-temperature cl-corrosion-resistant nitrogen-containing low-nickel alloy and preparation method thereof

A high-temperature, nickel-alloy technology, applied in the field of new high-temperature Cl-corrosion-resistant nitrogen-containing low-nickel alloys and their preparation, can solve problems such as dissolution, different alloy design ideas, corrosion, etc.

Active Publication Date: 2022-07-29
SHENYANG POLYTECHNIC UNIV
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Problems solved by technology

[0005] However, in the preparation method of high-nitrogen low-nickel stainless steel disclosed in Patent Document 1, although the addition of vanadium can increase the solubility of nitrogen, the design concept does not include high-temperature-resistant Cl - Corrosion is the key point, and this patent document is to solve the problem of N element dissolution in the process of nitrogen-containing stainless steel preparation, which is different from the design idea of ​​the alloy used for high-temperature corrosion resistance in the present invention

Method used

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  • A novel high-temperature cl-corrosion-resistant nitrogen-containing low-nickel alloy and preparation method thereof
  • A novel high-temperature cl-corrosion-resistant nitrogen-containing low-nickel alloy and preparation method thereof

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preparation example Construction

[0029] A new type of high temperature resistant Cl - The preparation method of corroded nitrogen-containing low-nickel alloy comprises the following steps:

[0030] Step 1. Calculate and weigh the raw materials of alloy elements according to chemical composition, wherein N element is added in the form of MnN and CrN.

[0031]Step 2. In addition to MnN and CrN, select Mn, Mo, Cr, V, Al, Ti, Nb and W bulk metals with a purity of more than 99.9% to adjust the ratio of other elements, mix the alloy raw materials, and put the vacuum melting furnace After vacuuming to a degree of vacuum less than 10Pa, bulk metal is added.

[0032] Step 3. After the alloy is completely melted, vacuum degassing is carried out at 1580° C. for 10 minutes.

[0033] Step 4. Use British PSI tightly coupled argon atomization equipment, and feed 97%Ar+3%N 2 The atomization temperature is 1600-1680℃, the melt flow rate is 3.5-4 kg / min, and the atomizing gas pressure is 3.5-4.5MPa.

[0034] Step 5, alloy ...

Embodiment 1

[0041] The specific composition of the alloy is: Ni: 42.0wt%, Cr: 24.0wt%, Mn: 7.0wt%, Si: 1.6wt%, Mo: 7.0wt%, Cu: 0.24wt%, Co: 0.81wt%, N: 0.21 wt%, Al: 1.4wt%, Ti: 1.43wt%, Nb: 7.0wt%, W: 2.6wt%, V: 1.3wt%, and the rest are Fe and inevitable impurities. The preparation process is as follows:

[0042] A BL410F electronic balance (1 mg) was used to weigh the weight of the added metal under each ratio in the orthogonal test. Put all the alloy raw materials into the crucible of the vacuum induction furnace, seal the furnace cover and start vacuuming. After the vacuum degree in the furnace is less than 10Pa, start to send the electro-chemical material. When the alloy was completely melted, vacuum degassing was performed at 1580 °C for 10 min. Then use the British PSI tightly coupled argon atomization equipment, pass 97%Ar+3%N 2 The atomization temperature is 1650 °C, the melt flow rate is 3.8 kg / min, and the atomizing gas pressure is 4.0 MPa. Subsequently, the temperature was ...

Embodiment 2

[0045] The specific composition of the alloy is: Ni: 44.0wt%, Cr: 24.0wt%, Mn: 7.0wt%, Si: 1.6wt%, Mo: 6.5wt%, Cu: 0.24wt%, Co: 0.81wt%, N: 0.18 wt%, Al: 1.4wt%, Ti: 1.43wt%, Nb: 6.5wt%, W: 2.0wt%, V: 1.3wt%, and the rest are Fe and inevitable impurities. The preparation process is as follows:

[0046] A BL410F electronic balance (1 mg) was used to weigh the weight of the added metal under each ratio in the orthogonal test. Put all the alloy raw materials into the crucible of the vacuum induction furnace, seal the furnace cover and start vacuuming. After the vacuum degree in the furnace is less than 10Pa, start to send the electro-chemical material. When the alloy was completely melted, vacuum degassing was performed at 1580 °C for 10 min. Then use the British PSI tightly coupled argon atomization equipment, pass 97%Ar+3%N 2 The atomization temperature is 1650 °C, the melt flow rate is 3.8 kg / min, and the atomizing gas pressure is 4.0 MPa. Subsequently, the temperature was ...

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Abstract

The invention belongs to the technical field of alloy materials, and in particular relates to a novel high temperature resistant Cl ‑ Corroded nitrogen-containing low-nickel alloy and preparation method. A new type of high temperature resistant Cl ‑ The corroded nitrogen-containing low-nickel alloy, measured by mass percentage, comprises the following components: Ni: 42.0-46.0wt%, Cr: 20.0-26.0wt%, Mn: 7.0-8.0wt%, Si: 1.6wt% and below, Mo: 6.0‑8.0wt%, Cu: 0.5wt% or less, Co: 0.8‑1.0wt%, N: 0.12‑0.21wt%, Ti+Al=2.8‑3.0wt%; Ti / Al=1.0‑1.3, Nb: 6-7%, W: 2.0-3.0wt%, V: 1.25-1.55wt%, and the rest are Fe and inevitable impurities. The optimization of the alloy composition of the present invention enables the nitrogen-containing low-nickel alloy to have excellent Cl resistance at high temperature ‑ Corrosive, can replace Inconel 625 alloy, used in high temperature, high pressure chemical, energy and marine engineering fields, such as facing 900 ℃, Cl ‑ Corrosion of the energy storage medium in the solar heat storage tube.

Description

technical field [0001] The invention belongs to the technical field of alloy materials, and in particular relates to a novel high temperature resistant Cl - Corroded nitrogen-containing low-nickel alloy and preparation method. Background technique [0002] Nickel-based superalloys have excellent oxidation resistance, hot corrosion resistance and good microstructure stability in the environment above 600 °C, so they are widely used in solar energy storage devices. Due to environmental pollution and the limitation of fossil fuel resources, solar energy has become an important part of human energy use. Modern solar technology collects sunlight and uses it to generate electricity or produce other energy. However, there are still some problems with solar technology that make it unable to work continuously. For example, solar energy is affected by night, dust and clouds, which greatly reduces the solar energy system. s efficiency. In order to solve such problems, it is necessar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C30/00C22C30/02C22C32/00B22F9/08C22F1/00
CPCC22C30/00C22C30/02C22C32/0068C22C19/055B22F9/082C22F1/00B22F2009/0848
Inventor 苏允海杨太森梁学伟戴志勇王英第魏祖勇张祥稳
Owner SHENYANG POLYTECHNIC UNIV
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