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High-niobium austenite heat-resistant steel having high tissue stability under 700 DEG C and preparation method of high-niobium austenite heat-resistant steel

An austenitic heat-resistant steel and stability technology, applied in the field of high-temperature metal structural materials, can solve problems such as poor organizational stability, threats to the safety of crew and personnel, and inability to meet service performance requirements.

Active Publication Date: 2019-05-14
HUANENG POWER INTERNATIONAL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Austenitic heat-resistant steel has poor microstructure stability during long-term service, and the σ phase and M 23 C 6 The large amount of phase precipitation in the grain boundary and in the grain has caused the high temperature strength and toughness of the austenitic heat-resistant steel to drop significantly, which will pose a huge threat to the safety of the unit and personnel
Since austenitic heat-resistant steel cannot meet the service performance requirements of the unit parameters above 650 °C, the use of more nickel-based superalloys will undoubtedly greatly increase the construction cost of the unit

Method used

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  • High-niobium austenite heat-resistant steel having high tissue stability under 700 DEG C and preparation method of high-niobium austenite heat-resistant steel
  • High-niobium austenite heat-resistant steel having high tissue stability under 700 DEG C and preparation method of high-niobium austenite heat-resistant steel
  • High-niobium austenite heat-resistant steel having high tissue stability under 700 DEG C and preparation method of high-niobium austenite heat-resistant steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] 1) Alloy preparation.

[0044] The specific chemical composition (unit: mass percentage) of the above alloy at the time of preparation is Cr: 21.5%, Ni: 18%, Nb: 1.7%, C: 0.04%, N: 0.1%, Co: 0.9%, Si: 0.4% , Mn:

[0045] 0.03%, B: 0.002%, Zr: 0.002%, and the balance is Fe.

[0046] After considering the burning loss, the batching is completed, argon gas is introduced into the vacuum arc melting furnace as a protective gas, and a 150g button ingot with uniform alloy composition is obtained by electromagnetic stirring and turning. In order to eliminate macroscopic and microscopic segregation, a homogenization annealing treatment is carried out at 1100-1260°C for 20-35 hours, so that the alloy elements can be diffused as fully and uniformly as possible. After the homogenization annealing treatment, in order to make a large amount of Nb, C and N elements in the primary MX phase dissolve back into the matrix as much as possible, the alloy is subjected to solution treatment...

Embodiment 2-7

[0056] Table 2 shows the specific chemical composition of the alloys of Examples 2-7 of the present invention. Through the preparation and analysis of these alloys, it is found that the corresponding microstructure stability and mechanical properties are in line with the conditions and requirements applied to the steam pipeline of the 650 ℃ ultra-supercritical supercritical super / reheater.

[0057] Table 2 Chemical composition of Examples 2-7 of the present invention (unit is mass percent, balance is Fe)

[0058] alloy

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Abstract

The invention relates to high-niobium austenite heat-resistant steel having high tissue stability under 700 DEG C and a preparation method of the high-niobium austenite heat-resistant steel. The high-niobium austenite heat-resistant steel disclosed by the invention is reasonable in ingredient design, good in processing performance and high in cost performance ratio; under 700 DEG C, the tissue deposition phase in a long-term prescription is stable, and a sigma phase is not found, so that the situation that the alloy is subjected to embrittlement in the high-temperature service process caused by the sigma phase is avoided; and dispersion strengthening of secondary MX phase and Z phase is performed. The high-niobium austenite heat-resistant steel comprises the following components in percentage by mass of 18-22% of Cr, 17-22% of Ni, 1-2% of Nb, 0.01-0.08% of C, 0.01-0.15% of N, 0.1-1% of Co, Si, Mn, B and Zr of which the total quantity is greater than or equal to 0.4% and smaller than orequal to 1%, and the balance Fe. The preparation method comprises the following steps of performing melting to obtain alloy ingots; performing uniform annealing treatment on the alloy ingots; and performing solution treatment at 1200-1280 DEG C on the alloy ingots after uniform annealing for 20-120min.

Description

technical field [0001] The invention relates to the technical field of high-temperature metal structural materials, in particular to a high-niobium austenitic heat-resistant steel with high structural stability at 700°C and a preparation method thereof. Background technique [0002] Energy and environmental issues are undoubtedly major global issues in the 21st century and play a decisive role in the economic development of various countries. Since my country's reform and opening up, the demand for electricity has increased dramatically year by year along with economic development. my country's annual newly installed capacity has steadily increased, and coal-fired thermal power generation still occupies an important position, accounting for about 70% of the total power generation. As we all know, thermal power generation usually uses steam to drive the rotation of the steam turbine to obtain electrical energy, so higher steam parameters are the key to improving the efficienc...

Claims

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Application Information

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IPC IPC(8): C22C33/04C22C38/02C22C38/04C22C38/48C22C38/50C22C38/52C22C38/54C21D1/26C21D6/00
Inventor 白佳铭袁勇朱传志张鹏尹宏飞党莹樱严靖博杨珍鲁金涛周永莉黄锦阳谷月峰
Owner HUANENG POWER INTERNATIONAL
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