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Steel for blades of turbine of ultra-supercritical fossil power plants and manufacturing method

A technology of steam turbine blades and thermal power units, which is applied in the field of metal materials, can solve problems such as not meeting performance requirements, and achieve the effects of high steam corrosion resistance and high creep resistance

Inactive Publication Date: 2012-06-27
SHANDONG UNIV OF TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Existing steam turbine blade materials cannot meet the performance requirements under the condition of steam temperature of 620°C

Method used

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  • Steel for blades of turbine of ultra-supercritical fossil power plants and manufacturing method
  • Steel for blades of turbine of ultra-supercritical fossil power plants and manufacturing method

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Embodiment Construction

[0024] Table 1 lists 14 kinds of heat-resistant steels whose composition is within the specified composition range of the present invention. The manufacturing methods are as follows: use a vacuum induction furnace to sequentially melt and pour the raw materials of the constituent elements to obtain a heat-resistant steel ingot, and then forge the heat-resistant steel ingot to obtain a φ20mm bar. Heat treatment process After heat treatment, it is processed into standard tensile creep specimens and Charpy V-notch impact specimens, and then tensile and impact tests at room temperature and durable fracture tests at 600-700°C are performed. According to the results of the durable test , using the Larson-Miller parameter method to estimate the durable fracture strength at 620°C and 100,000 hours. The test results are shown in Table 2. It can be seen from Table 2 that the heat-resistant steel of the present invention has good strength and toughness and obviously high high-temperatur...

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Abstract

The invention provides steel for blades of turbines of ultra-supercritical fossil power plants, which is characterized by comprising the following chemical components, by mass percentage, 10.0 to 12.0 of chromium, 0.1 to 0.6 of molybdenum, 2.4 to 3.0 of tungsten, 1.0 to 4.0 of cobalt, 0 to 0.5 of nickel, 0.2 to 1.0 of manganese, 0.010 to 0.019 of nitrogen, 0.10 to 0.30 of vanadium, 0.03 to 0.10 of niobium, 0.005 to 0.015 of titanium, 0.06 to 0.15 of carbon, 0.008 to 0.015 of boron, 1.0 to 3.0 of copper and the balance iron and unavoidable impurity. The manufacturing method includes steps of melting and casting the chemical components sequentially to obtain steel ingots, forging the steel ingots and performing heat treatment on the steel ingots. The heat treatment process is characterized by keeping oil cooling for 0.5 to 1 hour at the temperature ranging from 1050 DEG C to 1150 DEG C and keeping air cooling for 1 to 2 hours at the temperature ranging from 720 DEG C to 790 DEG C. The steel is excellent in corrosion resistance and creep resistance at high temperature, stable in structure for long-term use at high temperature and can be used as materials of the blades of the turbinesof the ultra-supercritical fossil power plants of over 620 DEG C.

Description

technical field [0001] The invention relates to a steel for steam turbine blades of an ultra-supercritical thermal power unit and a manufacturing method, belonging to the technical field of metal materials. Background technique [0002] In order to improve the efficiency of thermal power generation units and reduce CO 2 The key to the emission of gas is to increase the steam parameters of the thermal power generation unit, that is, to increase the temperature and pressure of the steam, but the degree of improvement of the parameters mainly depends on the materials used. The microstructure of 12Cr series ferritic heat-resistant steel in the quenched and tempered state is tempered lath martensite, and M is distributed in the original austenite grain boundary and martensite lath boundary 23 C 6 Type carbides contain high-density MX-type nano-precipitated phases in the lath boundaries and laths, so in addition to high corrosion resistance, they also have high thermal strength,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/32C22C38/56
Inventor 殷凤仕杨钢包汉生刘正东王立民
Owner SHANDONG UNIV OF TECH
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