Heat-treatment technology method for lower end socket forge piece of nuclear power reactor pressure vessel

Abstract

The invention discloses a heat-treatment technology method for a lower end socket forge piece of a million kilowatt grade nuclear power reactor pressure vessel by adopting 16MND5 alloy steel. The method comprises the following steps: heating a furnace to 400-500 DEG C, putting a forge piece in the furnace and keeping the temperature for 1-3h; continuously heating the furnace, wherein the rate of temperature increase is less than or equal to 80 DEG C / h; when the furnace is heated to 650-700 DEG C, keeping the temperature of the forge piece for 3-5h; continuously heating the furnace at a power rate of temperature increase, and when heating to 880-900 DEG C, soaking the forge piece and keeping the temperature for 5-8h; lifting the forge piece out from the furnace and putting into circulatingwater for cooling for at least 90 minutes, wherein the quantity of water supplied per hour is larger than or equal to 1000 tons; after the furnace is heated to 300-350 DEG C, putting the forge piece into the furnace and keeping the temperature for 1-3h; continuously heating the furnace, wherein the rate of temperature increase is smaller than or equal to 60 DEG C / h; when the furnace is heated to 640-660 DEG C, keeping the temperature of the forge piece for 5-8h; and lifting the forge piece out from the heat-treatment furnace, and carrying out air cooling until reaching the room temperature. The invention can enable the final mechanical property of the forge piece to reach the requirements of the related technical specification.

Description

technical field [0001] The invention relates to a heat treatment process, in particular to a heat treatment process for a lower head forging of a million-kilowatt nuclear power reactor pressure vessel 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 manufacturing te...

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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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