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Heat-resistant steel for ultra-supercritical steam turbine rotor

A steam turbine rotor and ultra-supercritical technology, which is applied in the field of metal materials, can solve the problem that the ultra-supercritical steam turbine rotor cannot meet the 620 ℃ requirement of the ultra-supercritical steam turbine unit.

Active Publication Date: 2016-03-30
WUXI TURBINE BLADE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above problems, the present invention provides a heat-resistant steel for an ultra-supercritical steam turbine rotor, which can solve the problem that the ultra-supercritical steam turbine rotor processed by X12CrMoWVNbN10-1-1 ferritic heat-resistant steel cannot meet the requirements of the ultra-supercritical steam turbine unit 620 ℃ asked questions

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0018] To process a heat-resistant steel for an ultra-supercritical steam turbine rotor, the raw material composition of the constituent elements is vacuum smelted and poured in sequence according to the following proportions, carbon (C): 0.1; manganese (Mn): 0.2; chromium (Cr): 11.00; cobalt (Co): 3.0; molybdenum (Mo): 0.75; tungsten (W): 1.7; nickel (Ni): 0.25; vanadium (V): 0.15; niobium (Nb): 0.072; ;The balance is Fe and impurity elements, of which impurity elements sulfur (S)≤0.010; phosphorus (P)≤0.012; copper (Cu)≤0.15; aluminum (Al)≤0.010; tin (Sn)≤0.010; ) ≤ 0.0015 parts; arsenic (As) ≤ 0.020; silicon (Si) ≤ 0.12; H ≤ 1.0ppm; For the mechanical property test, the mechanical properties of the tested material at room temperature and the durability of the material under the conditions of 650°C and 180Mpa in a short-term high-temperature endurance test are shown in Table 1.

Embodiment 2

[0020] To process a heat-resistant steel for an ultra-supercritical steam turbine rotor, vacuum smelt and cast the raw material composition of the constituent elements in sequence according to the following proportions, carbon (C): 0.11; manganese (Mn): 0.2; chromium (Cr): 10.5; cobalt (Co): 2.4; molybdenum (Mo): 0.9; tungsten (W): 1.4; nickel (Ni): 0.23; vanadium (V): 0.2; niobium (Nb): 0.08; nitrogen (N): 0.03 ;The balance is Fe and impurity elements, of which impurity elements sulfur (S)≤0.010; phosphorus (P)≤0.012; copper (Cu)≤0.15; aluminum (Al)≤0.010; tin (Sn)≤0.010; ) ≤ 0.0015 parts; arsenic (As) ≤ 0.020; silicon (Si): 0.115; H ≤ 1.0ppm; Mechanical properties test; the tested mechanical properties of the material at room temperature and the durability of the material in the short-term high temperature endurance test under the conditions of 650°C and 180Mpa are shown in Table 1.

Embodiment 3

[0022] To process a heat-resistant steel for an ultra-supercritical steam turbine rotor, the raw material composition of the constituent elements is vacuum smelted and poured in sequence according to the following proportions, carbon (C): 0.125; manganese (Mn): 0.2; chromium (Cr): 10.35; cobalt (Co): 3.1; molybdenum (Mo): 0.82; tungsten (W): 1.5; nickel (Ni): 0.24; vanadium (V): 0.2; niobium (Nb): 0.08; nitrogen (N): 0.03 ;The balance is Fe and impurity elements, of which impurity elements sulfur (S)≤0.010; phosphorus (P)≤0.012; copper (Cu)≤0.15; aluminum (Al)≤0.010; tin (Sn)≤0.010; ) ≤ 0.0015 parts; arsenic (As) ≤ 0.020; silicon (Si): 0.115; H ≤ 1.0ppm; Mechanical properties test; the tested mechanical properties of the material at room temperature and the durability of the material in the short-term high temperature endurance test under the conditions of 650°C and 180Mpa are shown in Table 1.

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Abstract

The invention provides heat-resistant steel for an ultra-supercritical steam turbine rotor, which can solve the problem that an ultra-supercritical steam turbine rotor manufactured by adopting X12CrMoWVNbN10-1-1 ferrite heat-resistant steel can not satisfy the demand of an ultra-supercritical steam turbine unit with the temperature of 620 DEG C, and is characterized by comprising the following elements by mass percent: 0.1-0.15 percent of carbon (C), 0.15-0.25 percent of manganese (Mn), 10.00-11.00 percent of chromium (Cr), 2.0-4.0 percent of cobalt (Co), 0.6-1.1 percent of molybdenum (Mo), 1.0-3.0 percent of wolfram (W), 0.15-0.25 percent of nickel (Ni), 0.15-0.25 percent of vanadium (V), 0.07-0.09 percent of niobium (Nb), 0.02-0.04 percent of nitrogen (N), and the balance of Fe and impurity elements.

Description

technical field [0001] The invention relates to the technical field of metal materials, in particular to a heat-resistant steel for an ultra-supercritical steam turbine rotor. Background technique [0002] At present, my country has become the country with the largest number of ultra-supercritical units in operation in the world. The demand for materials for ultra-supercritical units is very large. Manufacturing costs have risen sharply, and materials have become one of the restrictive factors for China's development of ultra-supercritical units. In order to relieve material constraints, it is urgent to carry out the development and application research of key materials for ultra-supercritical units. [0003] X12CrMoWVNbN10-1-1 (i.e. X12 heat-resistant steel) is a commonly used steel for ultra-supercritical steam turbine rotors. It is improved on the basis of 9Cr-1Mo heat-resistant steel. At present, the service temperature limit of X12 steel is 600°C . However, with the f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/52C22C38/60
Inventor 崔慧然陈瑞钢
Owner WUXI TURBINE BLADE
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