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Austenitic heat-resistant steel and preparation method thereof

A technology of austenitic heat-resistant steel and matrix, which is applied in the field of high-temperature metal structural materials, can solve problems such as poor structural stability and affect the safe operation of power stations, reduce grain boundary interface energy, and improve resistance to steam oxidation and flue gas. Corrosion ability, the effect of improving the toughness of the alloy

Active Publication Date: 2017-06-27
HUANENG POWER INT INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the HR3C alloy also showed some deficiencies during its service, that is, the stability of the structure is poor, and the toughness of the alloy decreases rapidly with the prolongation of service time, which affects the safe operation of the power station.

Method used

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  • Austenitic heat-resistant steel and preparation method thereof
  • Austenitic heat-resistant steel and preparation method thereof
  • Austenitic heat-resistant steel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-3

[0026] 1. Alloy composition

[0027] What Table 1 provided is the chemical composition of Examples 1, 2, and 3 of the present invention. Alloys 1#-3# used in the test are the austenitic alloys of Examples 1, 2, and 3 of the present invention. In order to compare with the commercial HR3C alloy, the composition of HR3C is also listed in the table.

[0028] The chemical composition (% by weight, balance is Fe) of the embodiment 1-3 of the present invention and comparative example (HR3C) of table 1

[0029]

[0030] 2. Alloy melting and thermal deformation

[0031] 19-25% Ni, 20-25% Cr, 1.0-6.0% Co, ≤1.0% Mn, 0.2-0.8% Nb, 0-0.5% V, ≤1.0% Si by weight percentage , 0.1-0.3% of N, 0.04-0.10% of C, 0.001-0.003% of B, 0-0.04% of Ce, 0.01-0.03% of P, the balance is Fe, added to the vacuum induction furnace for melting, pouring into alloy ingots.

[0032] Homogenize the alloy ingot at 1150-1200°C for 20-30 hours, then heat deform (hot forging or hot rolling) the homogenized alloy ...

Embodiment 4-7

[0049] Table 4 shows the chemical composition of Examples 4, 5, 6 and 7 of the present invention. Alloys 4#-6# used in the test are the austenitic alloys of Examples 4, 5, 6 and 7 of the present invention.

[0050] The chemical composition (% by weight, balance is Fe) of the embodiment of the present invention 4-7 of table 4

[0051] alloy Ni Cr mn Nb Si N C B P co V Ce 4# 25 20 0.1 0.8 1.0 0.1 0.04 0.002 0.07 1.0 0.25 0.015 5# 22 25 0.8 0.6 0.75 0.15 0.087 0.003 0.014 5.0 0.5 - 6# 19 23 0.3 0.2 0.66 0.25 0.10 0.001 0.01 6.0 0.3 0.04 7# 20 22 1.0 0.4 0.90 0.3 0.046 0.001 0.022 2.0 - 0.02

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Abstract

The invention discloses austenitic heat-resistant steel and a preparation method thereof. The austenitic heat-resistant steel is prepared from components in percentage by weight as follows: 19%-25% of Ni, 20%-25% of Cr, 1.0%-6.0% of Co, less than or equal to 1.0% of Mn, 0.2%-0.8% of Nb, 0-0.5% of V, less than or equal to 1.0% of Si, 0.1%-0.3% of N, 0.04%-0.10% of C, 0.001%-0.003% of B, 0-0.04% of Ce, 0.01%-0.03% of P and the balance of Fe. The austenitic heat-resistant steel is high in strength and high in impact toughness; the MX phase, the Z(CrNbN) phase and M23C6 are main strengthening phases; and compared with the prior art, the austenitic heat-resistant steel is comparable in machinability and material cost but more excellent in structure stability, high-temperature strength and impact toughness and can be applied to manufacturing of super-heaters and re-heaters of ultra-supercritical thermal power generating units at 600 DEG C or above.

Description

technical field [0001] The invention relates to the technical field of high-temperature metal structural materials, in particular to an austenitic heat-resistant steel and a preparation method thereof Background technique [0002] Coal-fired thermal power units provide more than 75% of my country's electricity, but the average power generation efficiency of thermal power units in my country is low and energy consumption is high, and they are the main emission sources of sulfur dioxide, nitride NOx, carbon dioxide and mercury. The Chinese government promises that by 2020, the carbon dioxide emission per unit of GDP will be reduced by 40-45% on the basis of 2005. Using high-parameter and large-capacity thermal power units is one of the most direct, economical and effective measures to achieve this goal. Therefore, the development of high-parameter ultra-supercritical coal-fired power generation technology has very important strategic significance and practical application val...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/52C22C38/04C22C38/48C22C38/46C22C38/02C22C38/54C22C33/04C21D1/18C21D8/00
CPCC21D1/18C21D8/005C21D2211/001C22C33/04C22C38/001C22C38/002C22C38/005C22C38/02C22C38/04C22C38/46C22C38/48C22C38/52C22C38/54
Inventor 袁勇朱传志尹宏飞党莹樱赵新宝严靖博杨珍鲁金涛周永莉黄锦阳
Owner HUANENG POWER INT INC
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