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Alumina type high-temperature resistant corrosion resisting high strength alloy steel and preparation method thereof

A technology of aluminum oxide and high temperature resistance, which is applied in the field of austenitic alloy steel, can solve problems such as heat exchanger tube explosion accidents, difficult substrate steel protection, and easy failure, so as to prevent oxidation and corrosion, improve high temperature resistance, and good The effect of welding performance

Inactive Publication Date: 2013-09-25
哈尔滨市屹昂科技开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example: in the application of ASME SA213-T91 and ASME SA213-T23 in domestic ultra-supercritical steam turbine boiler units, heat exchanger tube burst accidents caused by oxidation and corrosion often occur
The oxidation resistance of traditional heat-resistant steel mainly depends on the Cr-rich 2 o 3 Oxide film, but this kind of oxide film is easy to fail in high temperature and high pressure water vapor environment, and it is difficult to provide long-term protection for the base steel

Method used

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  • Alumina type high-temperature resistant corrosion resisting high strength alloy steel and preparation method thereof

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Experimental program
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Effect test

specific Embodiment approach 1

[0022] 1. According to the weight ratio of the elements in the product, the composition is C0.03-0.08%, Cr18-24%, Ni8-16%, Mn0.5-1%, Mo1-2%, W1-5%, Co0.05-0.5 %, Al3-8%, Nd0.1-2%, S≤0.007%, P≤0.02% and the balance of Fe are ready for alloying elements.

[0023] 2. Carry out chemical analysis of each element before smelting to ensure the accuracy of element content.

[0024] 3. Put the selected charge into the electric arc furnace for smelting, and wait for 10 minutes when the temperature of the furnace rises to 1680. Then transfer to ladle refining furnace (LF furnace) + vacuum argon-oxygen decarburization refining furnace (VOD furnace) for further refining, and complete the decarburization and degassing of alloy steel in this process. to obtain a clean slab.

[0025] The production process of the present invention adopts an electric arc furnace + a ladle refining furnace (LF furnace) + a vacuum argon-oxygen decarburization refining furnace (VOD furnace), and realizes the fo...

specific Embodiment approach 2

[0028] 1. According to the weight ratio of the elements in the product, the composition is C0.05-0.06%, Cr20-22%, Ni10-14%, Mn0.7-0.9%, Mo1.2-1.8%, W2-4%, Co0.1 The ratio of -0.4%, Al5-7%, Nd0.5-1.5%, S≤0.007%, P≤0.02% and the balance of Fe is ready for alloying elements.

[0029] 2. Carry out chemical analysis of each element before smelting to ensure the accuracy of element content.

[0030] 3. Put the selected charge into the electric arc furnace for smelting, and wait for 10 minutes when the temperature of the furnace rises to 1680. Then transfer to the ladle refining furnace (LF furnace) + vacuum argon oxygen decarburization refining furnace (VOD furnace) for further refining and then tap the steel.

specific Embodiment approach 3

[0031] 1. According to the weight ratio of the elements in the product, the composition is C0.06%, Cr21%, Ni12%, Mn0.8%, Mo1.6%, W3%, Co0.3%, Al7%, Nd1.2%, S≤ The ratio of 0.007%, P≤0.02% and the balance of Fe is ready for alloying elements.

[0032] 2. Carry out chemical analysis of each element before smelting to ensure the accuracy of element content.

[0033] 3. Put the selected charge into the electric arc furnace for smelting, and wait for 10 minutes when the temperature of the furnace rises to 1680. Then transfer to the ladle refining furnace (LF furnace) + vacuum argon oxygen decarburization refining furnace (VOD furnace) for further refining and then tap the steel.

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Abstract

The present invention provides an alumina type high-temperature resistant corrosion resisting high strength alloy steel and a preparation method thereof. The alloy steel comprises the following elements of 0.03-0.08% of C, 18-24% of Cr, 8-16% of Ni, 0.5-1% of Mn, 1-2% of Mo, 1-5% of W, 0.05-0.5% of Co, 3-8% of Al, 0.1-2% of Nd, 0-0.007% of S, 0-0.02% of P and the balance of Fe. The alloy elements are added into an arc furnace for melting and are insulated for 10 min at the temperature of 1680 DEG C, then are refined outside the furnace through a ladle finery and a vacuum argon and oxygen decarburization finery to get the steel. The method uses Cr, Mo and Co to improve high-temperature resistance, uses Ni to improve plasticity, W to increase wear resistance, and Ne to refine the crystal grains, and uses effect of a third element Cr; by adding a little Al, Al2O3 membrane is formed on the alloy surface at high temperature in oxygen-containing environment, and therefore the performances of high temperature resistance and high pressure water vapor corrosion resistance of the alloy are improved.

Description

technical field [0001] The invention relates to an austenitic alloy steel, and also relates to a preparation method of the austenitic alloy steel. Background technique [0002] In the working environment of high temperature (600℃~1000℃) and steam pressure of 25.4~30MPa, the oxidation phenomenon of metal materials is very serious. As a result, oxide scales of various thicknesses are formed inside the metal steel pipe, which makes the pipe wall thinner and even bursts. For example: ASME SA213-T91 and ASME SA213-T23 and other materials are used in domestic ultra-supercritical steam turbine boiler units, and tube burst accidents in heat exchangers often occur due to oxidation and corrosion. The oxidation resistance of traditional heat-resistant steel mainly depends on the Cr-rich 2 o 3 However, this kind of oxide film is prone to failure in high temperature and high pressure water vapor environment, and it is difficult to provide long-term protection for the base steel. Ther...

Claims

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Application Information

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IPC IPC(8): C22C38/52C22C30/00
Inventor 回曙光
Owner 哈尔滨市屹昂科技开发有限公司
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