Heat treatment process of nuclear power reactor pressure vessel reactor core cylinder forgings

Abstract

The invention discloses a heat treatment process of million-kilowatt nuclear power reactor pressure vessel reactor core cylinder forgings made of 16MND5 alloy steel, which comprises: raising the temperature of a furnace to 400 to 450 DEG C, placing the forgings in the furnace and keeping the temperature for 2 to 5 hours; continuing to heat the furnace at a temperature rise speed of less than or equal to 80 DEG C per hour; when the temperature of the furnace rises to 670 to 700 DEG C, keeping the temperature of the forgings for 4 to 6 hours; continuing to heat the furnace at a power temperature rise speed, and keeping the temperature of the forgings for 6 to 10 hours after the temperature of the forgings is uniform when the forgings are heated to 870 to 900 DEG C; lifting the forgings out of the furnace and placing the forgings in circulating water for cooling, wherein the water supply per hour is more than or equal to 1,500 tons; raising the temperature of the furnace to 300 to 350 DEG C, placing the forgings in the furnace, and keeping the temperature of the forgings for 2 to 5 hours; continuing to heat the furnace at a temperature rise speed of less than or equal to 60 DEG C per hour; when the temperature of the furnace rises to 635 to 665 DEG C, keeping the temperature of the forgings for 6 to 10 hours; and lifting the forgings out of the heat treatment furnace, and cooling the forgings in the air to room temperature. When the method is used, the final mechanical performance of the forgings can meet the requirements of related technical standards.

Description

technical field [0001] The invention relates to a heat treatment process method, in particular to a heat treatment process method for a million-kilowatt nuclear power reactor pressure vessel core barrel forging using 16MND5 alloy steel. Background technique [0002] At present, global nuclear power has entered a period of rapid development. In order to improve the energy structure, all industrialized countries and developing countries are actively committed to the development of nuclear power. In recent years, power shortage has become a bottleneck restricting the sustained and rapid development of China's economy. As an important measure to save energy and adjust energy structure, nuclear power has been included in the national power development plan. The development of my country's nuclear power industry has a history of more than 30 years. It has always been based on the research and trial production of small-scale nuclear power equipment, and has not formed mature manufa...

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Problems solved by technology

The development of my country's nuclear power industry has a history of more than 30 years. It has always been based on the research and trial production of small-scale nuclear power equipment, and has not formed mature manufacturing technology and production equipment capabilities.

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