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Performance heat treatment method of sa508-3 large forgings for nuclear capacitors

A heat treatment method and technology for large forgings, applied in the field of heat treatment, can solve problems such as toughness lower than specification requirements, poor composition, serious problems, etc., and achieve the effect of meeting technical specification requirements, high toughness index, and improved strength and toughness index

Active Publication Date: 2016-01-06
SHANGHAI ELECTRIC SHMP CASTING & FORGING CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The above-mentioned heat treatment process of conventional quenching + high temperature tempering can meet the performance requirements of most large nuclear power forgings, but there are still some forgings due to defects (such as poor composition and serious segregation) caused by the previous process. Conventional properties Toughness after heat treatment is lower than specification requirements

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  • Performance heat treatment method of sa508-3 large forgings for nuclear capacitors

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Embodiment Construction

[0030] The performance heat treatment method of SA508-3 large-scale forgings for nuclear capacitors of the present invention is used to improve the performance of forgings for nuclear capacitors whose material is SA508-3, the outer diameter is 3.5-6.5m, the height is not more than 5m, and the wall thickness is 100-250mm. Heat treatment, including the following steps:

[0031] The first step, the first quenching;

[0032] Put the forging into the furnace and heat it to 600-700°C and keep it for 4-5 hours; then heat it to 880-920°C at a heating rate of ≤100°C / hour and keep it for 4-5 hours; then take it out of the furnace and cool it to room temperature;

[0033] The second step, the second quenching;

[0034] Put the forging into the furnace and heat it to 600-700°C and keep it for 4-5 hours; then heat it to 880-920°C at a heating rate of ≤100°C / hour and keep it for 4-5 hours; then take it out of the furnace and cool it to room temperature;

[0035] The third step, the third ...

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Abstract

The invention discloses a performance heat treatment method for an SA508-3 large forging for a nuclear power vessel. The method is used for performing heat treatment on the forging for the nuclear power vessel, the material of the forging is SA508-3, the external diameter is 3.5-6.5 m, the height is not larger than 5m, and the wall thickness is 100-250 mm. The method comprises the following steps: step 1, first-time quenching, namely putting the forging into a furnace to heat to 600-700 DEG C, and then preserving heat for 4-5 hours, then heating to 880-920 DEG C at a temperature rising rate of less than or equal to 100 DEG C per hour, preserving heat for 4-5 hours, then discharging from the furnace, and cooling the forging with water to the room temperature; step 2, second-time quenching; step 3, tempering, namely heating the forging to 635-660 DEG C at the temperature rise rate of less than or equal to 100 DEG C per hour, preserving heat for 4-5 hours, and discharging from the furnace for cooling in the air. The method adopts multiple times of quenching operation before high-temperature tempering, refines organization through multiple times of quenching, finally obtains the needed performance through tempering adjustment, can increase the low-temperature toughness of the large forging for nuclear power on the basis of ensuring the qualified strength, and therefore meets the performance requirement of the large forging for nuclear power.

Description

technical field [0001] The invention relates to a heat treatment method, in particular to a performance heat treatment method for SA508-3 large forgings used in nuclear capacitors. Background technique [0002] Nuclear capacitors play a vital role in ensuring the safe operation of nuclear power plants throughout the 40-60-year service cycle, so nuclear capacitors are generally assembled and welded by high-performance large forgings. [0003] General requirements for SA508-3 large forgings for nuclear capacitors are as follows: [0004] 1. It has high room temperature strength and high temperature strength, and the technical index is measured by room temperature tensile test and high temperature tensile test; [0005] 2. Sufficient toughness, especially low temperature toughness, which is generally measured by Charpy impact test or drop weight test. From the perspective of safety, it is generally required that the toughness of the forging material should be improved as much...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/00C22C38/12C21D9/14
Inventor 凌进张智峰陈卓于清凯
Owner SHANGHAI ELECTRIC SHMP CASTING & FORGING CO LTD
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