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Novel heat-resistant steel for key hot end part of ultrahigh-parameter steam turbine

A technology for hot end parts and steam turbines is applied in the field of heat-resistant steel, which can solve the problems of limited improvement of high-temperature durability and oxidation resistance of heat-resistant steel, and achieve the effects of improving high-temperature mechanical properties and preventing powder agglomeration.

Active Publication Date: 2019-05-17
DONGFANG TURBINE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, adjusting W, Co, B, Nb, N and other elements to improve the high-temperature durability and oxidation resistance of heat-resistant steel is also limited. At present, it is urgent to develop a new strengthening method to further optimize the high-temperature performance and oxidation resistance of heat-resistant steel. Antioxidant properties

Method used

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  • Novel heat-resistant steel for key hot end part of ultrahigh-parameter steam turbine
  • Novel heat-resistant steel for key hot end part of ultrahigh-parameter steam turbine
  • Novel heat-resistant steel for key hot end part of ultrahigh-parameter steam turbine

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Experimental program
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Effect test

Embodiment 1

[0056] According to the required chemical elements, weigh each component to obtain raw materials, put the raw materials in a vacuum smelting furnace for smelting, add block additives during the vacuum smelting process, and then carry out electroslag remelting smelting to ensure uniform melting, then casting Form a steel ingot, the size of the steel ingot is ψ50, forge the steel ingot, the forging temperature range is 1100-1200°C; then carry out the following treatment on the steel ingot: quenching treatment temperature is 1050°C, holding time 1h, oil cooling or air cooling to room temperature, Then perform a tempering treatment, the tempering temperature is 700°C, the holding time is 4h, air-cooled or air-cooled to room temperature, and then a second tempering treatment is performed, the tempering temperature is 680°C, the holding time is 4h, air-cooled or air-cooled to room temperature room temperature. The weight percentage (%) of each component of the heat-resistant steel: ...

Embodiment 2

[0058] According to the required chemical elements, weigh each component to obtain raw materials, put the raw materials in a vacuum smelting furnace for smelting, add block additives during the vacuum smelting process, and then carry out electroslag remelting smelting to ensure uniform melting, then casting Form a steel ingot, the size of the steel ingot is ψ50, the forging temperature range is 1100-1200°C; then the steel ingot is treated as follows: the quenching temperature is 1050°C, the holding time is 1h, oil cooling or air cooling to room temperature, and then a tempering For processing, the tempering temperature is 680°C, the holding time is 6h, and air-cooled or air-cooled to room temperature. The weight percentage (%) of each component of the heat-resistant steel: C: 0.05, Cr: 9.25, Co: 2.92, W: 2.96, Mo: 0.38, V: 0.15, Ni: 0.43, Nb: 0.08, N: 0.034, B: 0.023, Si: 0.0013, Mn: 0.21, S: 0.0018, P: 0.0010, Y: 0.60.

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Abstract

The invention provides novel heat-resistant steel for a key hot end part of an ultrahigh-parameter steam turbine. The novel heat-resistant steel is prepared from the components in percentage by weight: 0.02-0.08% of C, 8.00-10.00% of Cr, 2.0-4.0% of Co, 2.0-4.0% of W, 0.10-0.80% of Mo, 0.10-0.30% of V, 0.30-0.70% of Ni, 0.05-0.15% of Nb, 0.010-0.050% of N, 0.010-0.030% of B, 0.1-1.0% of rare earthelements, no more than 0.10% of Si, 0.10-1.00% of Mn, and the balance of Fe and inevitable impurities. The novel heat-resistant steel belongs to martensitic heat-resistant steel and has the good high-temperature property and oxidation resistance property, thus temperature parameters of the steam turbine are increased, and the power generating efficiency of the steam turbine is improved advantageously.

Description

technical field [0001] The new heat-resistant steel for the key hot-end parts of ultra-high parameter steam turbines involved in the present invention is mainly used in the field of steam turbines, especially the key hot-end parts of steam turbines that have special requirements for creep strength and high temperature oxidation resistance, such as high-temperature turbine blades Heat-resistant steel for small and medium-sized forgings such as valve core parts. Background technique [0002] The current global energy revolution and transformation has put forward new requirements for power generation equipment, and the development of power generation equipment is facing new tasks of promoting green and low-carbon development and upgrading of energy structure. my country's energy structure is "more coal, less oil, and less gas". Coal will exist as the main energy source for a long time. Efficient and clean use of coal is the most effective means to reduce air pollution and carbo...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/46C22C38/48C22C38/52C22C38/54C21D8/00C22C33/04
Inventor 裴玉冰王天剑巩秀芳江雷郭汉杰郭靖杨文晟张邦强王芬玲王海洋
Owner DONGFANG TURBINE CO LTD
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