FeCrAl alloy tube material for light water reactor cladding and rolling method thereof

Abstract

A FeCrAl alloy tube material for light water reactor cladding and a rolling method thereof are disclosed. The alloy tube material includes the following components: 78.5% of Fe, 12% of Cr, and 5.2% ofAl. The rolling method includes the following steps: annealing a FeCrAl alloy tube at a temperature of 1150 degrees centigrade, thermally insulating the FeCrAl alloy tube for 60 min, and water-cooling the FeCrAl alloy tube; removing scales on the inner and outer surfaces of the tube, chamfering a tube port, and coating the surface with lubricating oil; selecting three rollers and polishing and derusting the surface of a mandril; setting rolling parameters, installing the rollers, the mandril, a mandrel and applying lubricating oil, and finally feeding the material; firstly slowly starting a rolling mill until the rollers completely roll the tube, at the end of the first pass, rolling the tube again based on the sequence of the above steps. The rolled alloy tube of the invention has an elongation of 20.1%, a tensile strength of 675 MPa, a yield strength of 560 MPa, a hardness of 261 HV, is improved in plasticity and significantly improveed in workability, and can meet the requirementsof subsequent rolling of the tube.

Description

technical field [0001] The invention belongs to the technical field of light water reactor cladding, and in particular relates to a FeCrAl alloy tube material for light water reactor cladding and a rolling method thereof. Background technique [0002] In March 2011, a nuclear leakage accident occurred at the Fukushima nuclear power plant. The main reason was that the zirconium alloy cladding reacted violently with high-temperature coolant water under accident conditions, releasing a large amount of heat and explosive gas hydrogen, which resulted in deterioration of the mechanical properties of the cladding material. Nuclear catastrophic consequences such as hydrogen explosion of the reactor and leakage of a large amount of radioactive products are produced. In the same year, the concept of nuclear reactor accident-tolerant nuclear fuel (ATF) cladding was proposed. It is a new generation of fuel system developed to improve the ability of fuel elements to withstand severe acci...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a new light water reactor cladding material FeCrAl alloy pipe material and its rolling method for the existing FeCrAl alloy pipe with complex preparation process and poor performance of the prepared pipe.

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