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A heat treatment method for improving the durability strength of heat-resistant cast steel materials for ultra-supercritical steam turbines

A heat treatment method and technology of heat-resistant cast steel, applied in the field of heat treatment of heat-resistant cast steel materials, can solve problems such as poor durability and achieve strong operability

Active Publication Date: 2021-08-17
HARBIN TURBINE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to solve the technical problem of poor durability of the existing heat-resistant cast steel materials for ultra-supercritical steam turbines, and provides a method for improving the durable strength of heat-resistant cast steel materials for ultra-supercritical steam turbines

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0014] Embodiment 1: This embodiment is a heat treatment method for improving the durable strength of heat-resistant cast steel materials for ultra-supercritical steam turbines, specifically:

[0015] 1. Preliminary heat treatment: heat-resistant cast steel materials for ultra-supercritical steam turbines are kept at a temperature of 750°C to 790°C for 12h to 15h, and then cooled with the furnace;

[0016] 2. Performance heat treatment: heat-resistant cast steel materials for ultra-supercritical steam turbines are kept at a temperature of 1090°C to 1130°C for 1h to 1.5h / 25mm, and then air-cooled or oil-cooled, at a temperature of 720°C to 740°C Under the conditions of heat preservation for 1h ~ 1.5h / 25mm, take the sample out of the furnace and cool it naturally in the air to complete the heat treatment;

[0017] The composition of the heat-resistant cast steel material for ultra-supercritical steam turbines is as follows according to the mass fraction: C is 0.12% to 0.14%, Si ...

specific Embodiment approach 2

[0018] Embodiment 2: The difference between this embodiment and Embodiment 1 is that in Step 1, the temperature is kept at 770° C. for 12 hours and then cooled with the furnace. Others are the same as the first embodiment.

specific Embodiment approach 3

[0019] Specific embodiment 3: The difference between this embodiment and specific embodiment 1 or 2 is that in step 2, heat preservation for 1h / 25mm at a temperature of 1110°C, and then air cooling or oil cooling, at a temperature of 730°C Keep warm for 1h / 25mm, take the sample out of the furnace, and cool it naturally in the air to complete the heat treatment. Others are the same as those in Embodiment 1 or 2.

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Abstract

The invention relates to a heat treatment method for improving the durable strength of a heat-resistant cast steel material for an ultra-supercritical steam turbine, and relates to a heat treatment method for a heat-resistant cast steel material for a steam turbine. The invention aims to solve the technical problem of poor durability of the existing heat-resistant cast steel materials for ultra-supercritical steam turbines. The present invention: 1. Preliminary heat treatment; 2. Performance heat treatment. The present invention limits the content of each element in the hot cast steel material so that the Cr equivalent is 8% to 9%, avoiding the occurrence of harmful phase δ-ferrite. The process of the invention has strong operability, and the creep durability of ZG13Cr10Mo1W1VNbN can reach 464 hours under the pressure of 670 DEG C and 98 MPa. The invention is applicable to the field of steam turbines.

Description

technical field [0001] The invention relates to a heat treatment method for a heat-resistant cast steel material for a steam turbine. Background technique [0002] ZG13Cr10Mo1W1VNbN is an improved 9%-12% Cr heat-resistant cast steel material added with Mo and W, which is widely used in ultra-supercritical steam turbine cylinders, valve casings, valve covers and other high-temperature components. The composition of the steel is complicated, and the manufacturing processes such as smelting, pouring, and heat treatment are complicated, and the high temperature performance is required. In actual production, it is difficult to meet the standard requirements for durability. In order to improve the lasting performance, it is necessary to formulate reasonable process regulations and carry out precise control in the actual production process. Contents of the invention [0003] The invention aims to solve the technical problem of poor durability of the existing heat-resistant cast...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D6/00C22C38/02C22C38/04C22C38/44C22C38/46C22C38/48
CPCC21D6/004C22C38/001C22C38/02C22C38/04C22C38/44C22C38/46C22C38/48
Inventor 彭建强吕振家王德彪刘新新张小伍徐佰明周立艳冯天澍徐勤于海欧韩亮李海霞
Owner HARBIN TURBINE