Heat-resistant steel for ultra-supercritical steam turbine rotor

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...

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