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Heat Treatment Technology of Large-scale Turbine Upper Crown Castings

A technology for water turbines and castings, applied in the field of large-scale water turbine processing, can solve the problems of small stress and difficult heat treatment of the upper crown, and achieve the effect of small stress

Active Publication Date: 2017-07-14
TIANJIN HEAVY EQUIP ENG RES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above analysis, the present invention aims to provide a heat treatment process for large hydraulic turbine crown castings, which is used to solve the problem of difficult heat treatment of existing large hydraulic turbine crowns, so that the stress of the crown during heat treatment is small and does not cause excessive stress. And produce cracks, and can meet the comprehensive performance requirements such as high strength

Method used

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  • Heat Treatment Technology of Large-scale Turbine Upper Crown Castings
  • Heat Treatment Technology of Large-scale Turbine Upper Crown Castings
  • Heat Treatment Technology of Large-scale Turbine Upper Crown Castings

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Embodiment Construction

[0028] Take crowning for production of a hydropower station as an example:

[0029] Material: ZG06Cr13Ni5Mo;

[0030] Crown Size: Maximum Outer Circle Diameter Height H=2445.2, W=500, H, W unit is mm.

[0031] The crown heat treatment process is as follows:

[0032] 1) Select a trolley furnace with a trolley furnace surface size of 10m×10m;

[0033] 2) Furnace loading: install the upper crown after cleaning the molding sand on the furnace surface of the trolley, and support it with pad iron to ensure that the distance between the largest outer circular bottom surface of the upper crown and the furnace surface of the trolley is not less than 800mm, and the support of the upper crown casting There are no less than 5 points, and they are evenly distributed along the circumferential direction. There must be no overhead support points to prevent the deformation of the upper crown and ensure a good circulation of the furnace gas; then install four blowers around the furnace surf...

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Abstract

The invention relates to a heat treatment process for a crown casting of a large-sized hydraulic turbine. The heat treatment process for the crown casting of the large-sized hydraulic turbine comprises the following steps of heating: heating the crown from a room temperature to 250+ / -20 DEG C at a speed of 20 DEG C / h, heating the crown to 550+ / -20 DEG C, and preserving the heat of the crown at 550+ / -20 DEG C for W / 100 hours; heating the crown to 780+ / -20 DEG C at a speed of 30 DEG C / h and preserving the heat of the crown for 1.4xW / 100 hours; heating the crown to 1020+ / -10 DEG C at a speed of 50 DEG C / h and preserving the heat of the crown for 1.4xW / 100 hours; and blowing air to cool the crown to a temperature of less than 150 DEG C; and temper heat treatment: preserving the crown at 200+ / -20 DEG C for W / 100 hours; heating the crown to 400+ / -20 DEG C at a speed of 20 DEG C / h and preserving the crown for W / 100 hours; heating the crown to 600+ / -10 DEG C at a speed of 20 DEG C / h and preserving the crown for 3xW / 100 hours; and performing furnace cooling on the crown so as to cool the crown to a temperature of less than 150 DEG C at a speed of 30 DEG C / h. Through the adoption of the method, the stress of the crown in the heat treatment process is small, no crack is generated and overall performance requirements such as high strength and the like are satisfied.

Description

technical field [0001] The invention relates to the technical field of large-scale water turbine processing, in particular to a heat treatment process for crown castings of large-scale water turbines. Background technique [0002] With the growing demand for energy from the development of the national economy, my country has gradually increased its hydropower development efforts in recent years. It is estimated that by 2020, my country's installed hydropower capacity will exceed 230 million kilowatts. At the same time, water turbines are gradually becoming large-scale. In the future, my country will mainly focus on the construction of 700MW and above water turbines. However, it is more difficult to produce stainless steel castings for large water turbines. There are still some difficulties. For example, the 26 units on the left / right bank of the Three Gorges in my country are all 700,000-kilowatt units, and most of the castings rely on imports. [0003] Large-scale turbine ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/00
CPCC21D9/0068C21D2211/001
Inventor 孙煜伟张亚才张国利赵丽王晓宇
Owner TIANJIN HEAVY EQUIP ENG RES
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