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Alloy material for turboset rotor and preparation method thereof

A technology of alloy materials and steam turbines, which is applied in medium pressure rotor alloy materials and its preparation, alloy materials of steam turbine rotors and its preparation, and ultra-supercritical steam turbine high pressure field, which can solve the problems that the high-temperature durability of materials is difficult to meet the requirements, etc.

Active Publication Date: 2015-08-05
SICHUAN JIANGYOU LIUHE STEAM TURBINE MATERIAL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide an alloy material and a its preparation method

Method used

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  • Alloy material for turboset rotor and preparation method thereof
  • Alloy material for turboset rotor and preparation method thereof
  • Alloy material for turboset rotor and preparation method thereof

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Embodiment

[0034] The embodiment of the present invention includes the following steps.

[0035] 1. Preparation of electroslag ingot

[0036] (1) Weigh the raw materials according to the proportion, and smelt them in a vacuum induction furnace. During the smelting process, adjust the content of the chemical elements so that the weight percentages are as shown in Table 1.

[0037] The weight percent of table 1 embodiment 1-5

[0038]

[0039] During the smelting process, the content of impurity elements is controlled as low as possible, and the solution obtained from smelting is poured into a consumable electrode.

[0040] (2) Place the prepared consumable electrode in an electroslag furnace for remelting and refining to further reduce the content of impurity elements so that it meets the following requirements:

[0041] 0.12-0.14wt% C; 0.30-0.40wt% Mn;

[0042] 9.10-9.50wt% Cr; 1.45-1.55wt% Mo;

[0043] 0.10-0.20wt% Ni; 0.18-0.22wt% V;

[0044] 1.20-1.40wt% Co; 0.040-0.060wt% Nb;...

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Abstract

The invention aims at providing an alloy material for a turboset rotor and a preparation method thereof and solves the problems that the steam temperature and the work pressure of an ultra supercritical unit are higher than those of the current unit and the high-temperature endurance property of the current material cannot meet the requirement. The alloy material comprises the following components by weight percentage: 0.12-0.14wt% of C, 0.30-0.40wt% of Mn, 9.10-0.50wt% of Cr, 1.45-1.55 wt% of Mo, 0.10-0.20 wt% of Ni, 0.18-0.22 wt% of V, 1.20-1.40 wt% of Co, 0.040-0.060 wt% of Nb, 0.015-0.030wt% of N, and 0.008-0.010wt% of B. By adopting the alloy material, the requirements of high temperature and high stress work condition can be met, the yield strength RP 0.02 is greater than or equal to 600 MPa, the alloy material can be used as an ultra supercritical turboset high-pressure and medium-pressure rotor alloy material, and the using requirement of a steam turbine rotor under the work environment is met. The alloy material is excellent in room-temperature pull-up performance and high-temperature endurance property, can be used as an supercritical and ultra supercritical turboset high-pressure and medium-pressure rotor alloy material, has important meaning for promoting the application and development of the ultra supercritical turboset and is worthy of large-scale popularization and application.

Description

technical field [0001] The invention relates to the field of materials, in particular to the field of steam turbine alloys, in particular to an alloy material used for a rotor of a steam turbine unit and a preparation method thereof. The invention relates to an alloy material for ultra-supercritical steam turbine rotors and a preparation method thereof, and furthermore, an alloy material for ultra-supercritical steam turbine high-pressure and medium-pressure rotors and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of steam turbine manufacturing technology, the trend of steam turbines to supercritical and ultra-supercritical units is accelerating. The steam temperature and working pressure of the steam turbine supercritical unit are 520°C and 15Mpa respectively; while the steam temperature of the steam turbine ultra-supercritical unit is as high as 600°C (higher or even 650°C), and its working pressure also reaches 26-...

Claims

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Application Information

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IPC IPC(8): C22C38/54C22C33/04C21D8/00
Inventor 廖云虎
Owner SICHUAN JIANGYOU LIUHE STEAM TURBINE MATERIAL
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