Heat treatment method of nuclear island ultralarge section forging

A heat treatment method and preparatory heat treatment technology, applied in the field of heat treatment, can solve the problems of inability to measure the heat treatment process online

Active Publication Date: 2016-12-14
SUZHOU NUCLEAR POWER RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limitation of testing technical conditions, the heat treatment process cannot be measured online, and the heat treatment process of parts can only be formulated based on traditional experience, which has great limitations in setting heat treatment process parameters

Method used

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  • Heat treatment method of nuclear island ultralarge section forging
  • Heat treatment method of nuclear island ultralarge section forging
  • Heat treatment method of nuclear island ultralarge section forging

Examples

Experimental program
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Effect test

Embodiment 1

[0023] This embodiment provides a heat treatment method for a nuclear island super-large cross-section forging (material is SA508Gr3), which includes the following steps:

[0024] (a) Rough machining: process the inner and outer surfaces of the maximum wall thickness of the super-large cross-section forging of the nuclear island to be close to the delivery size, leaving a margin of 10 to 15 mm on one side; if there is a step, the chamfer should be greater than R15; Place thermocouples on the inner and outer surfaces of the largest and smallest wall thicknesses of island super-large cross-section forgings (the thermocouples are placed in the metal compact and connected to the forging by welding, and the temperature deviation between the thermocouples during the subsequent heat treatment and heat preservation process does not exceed ±10 ℃).

[0025](b) Preliminary heat treatment: Place the large opening of the nuclear island super-large cross-section forging in the middle of the...

Embodiment 2

[0039] This embodiment provides a heat treatment method for a nuclear island super-large cross-section forging (the material is SA508Gr3), the steps of which are basically the same as those in Embodiment 1, the difference is that the heating rate and the holding temperature in each step are inconsistent, specifically:

[0040] In step (b), the temperature is raised from room temperature based on the thermocouple in contact with the workpiece (the heating rate is 200°C / hour), and the temperature is kept at 400°C for 10h; then the temperature is raised to 600°C (the heating rate is 50°C / hour ), keep warm for 10h; then heat up to 890°C (heating rate is 55°C / hour), keep warm for 10h and then cool in water for 3h;

[0041] (c) Quenching and tempering treatment: Based on the thermocouple in contact with the forging, start to heat up from room temperature (heating rate is 150°C / hour), keep at 400°C for 10 hours; then heat up to 600°C (heating rate is 50°C / hour hours), keep warm for 1...

Embodiment 3

[0055] This embodiment provides a heat treatment method for a nuclear island super-large cross-section forging (the material is SA508Gr3), the steps of which are basically the same as those in Embodiment 1, the difference is that the heating rate and the holding temperature in each step are inconsistent, specifically:

[0056] In step (b), the temperature is raised from room temperature based on the thermocouple in contact with the workpiece (the heating rate is 200°C / hour), and the temperature is kept at 500°C for 5h; then the temperature is raised to 700°C (the heating rate is 100°C / hour ), keep warm for 5h; then heat up to 900°C (heating rate is 50°C / hour), keep warm for 18h and then cool in water for 5h;

[0057] (c) Quenching and tempering treatment: Based on the thermocouple in contact with the forging, start to heat up from room temperature (heating rate is 200°C / hour), keep it at 500°C for 5 hours; then raise the temperature to 700°C (heating rate is 50°C / hour hours), ...

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Abstract

The invention relates to a heat treatment method of a nuclear island ultralarge section forging. The method comprises the following steps: (b) preheating treatment: the nuclear island ultralarge section forging is heated from room temperature to 880-910 DEG C for insulation, and then is dipped in water for cooling; (c) thermal refining: scales on the surface of the nuclear island ultralarge section forging treated in the step (b) are removed; and the nuclear island ultralarge section forging is heated from room temperature to 740-890 DEG C for insulation, and then is cooled by water; and (d) tempering: the nuclear island ultralarge section forging treated by the step (c) is heated from room temperature to 615-645 DEG C for insulation, and then is cooled along with a furnace to reach the room temperature. The method can guarantee full austenitizing of the part with the largest thickness, is finer in grains, can effectively prevent hot cracks and cold cracks, and greatly improves the yield of finished products.

Description

technical field [0001] The invention belongs to the field of heat treatment methods, and in particular relates to a heat treatment method for a nuclear island super-large section forging. Background technique [0002] As the concept of low-carbon environmental protection is becoming more and more popular, nuclear power, a clean energy source, has attracted more and more attention from all countries. my country has carried out localization of nuclear power equipment since the end of the last century, and the main equipment of the nuclear island of the second-generation nuclear power plant reactor has been fully localized. The main equipment of the third-generation nuclear power and Hualong No. 1 nuclear power unit with independent intellectual property rights Nationalization stage. With the improvement of the power of the new reactor type and the latest requirements of nuclear safety, the design of the important components of the nuclear island is also developing in the direc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/00C21D1/25C21D1/18C21D6/00
CPCC21D1/18C21D1/25C21D6/00C21D9/00
Inventor 刘钊赵东海梁书华张绍军阚玉琦吴洪杨文彬张文中
Owner SUZHOU NUCLEAR POWER RES INST
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