Manufacturing method for austenitic stainless steel bar used for nuclear power reactor

An austenitic stainless steel and reactor technology, which is applied in the field of the preparation of austenitic stainless steel bars for nuclear power reactors, can solve problems such as coarse structure, die adhesion, and influence on mechanical properties, and achieve uniform deformation and ensure product specifications.

Active Publication Date: 2016-04-06
西安诺博尔稀贵金属材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] First of all, the thermal processing process will lead to the coarse structure of the stainless steel bar after processing, and the insufficient cooling rate during the cooling process will cause a large amount of carbides to precipitate on the stainless steel bar, which will affect its corrosion performance
[0005] Secondly, the cold processing of stainless steel rods by fixed die drawing process has high requirements on lubrication conditions, and it is easy to cause adhesion with the die to affect production efficiency; at the same time, when stainless steel rods are drawn by fixed dies, the deformation mode of the metal is the surface metal flow mode, and the rod The uneven deformation of the material affects its mechanical properties
[0006] Thirdly, due to the high strength of "nuclear grade" austenitic stainless steel, the requirements for dimensional accuracy are very strict, so the straightness of the bar after straightening by the traditional roller leveler is difficult to meet the requirements, and multiple times of straightening are required Straight, low production efficiency

Method used

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  • Manufacturing method for austenitic stainless steel bar used for nuclear power reactor
  • Manufacturing method for austenitic stainless steel bar used for nuclear power reactor
  • Manufacturing method for austenitic stainless steel bar used for nuclear power reactor

Examples

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Embodiment 1

[0030] The preparation method of the austenitic stainless steel rod for nuclear power reactor of the present embodiment comprises the following steps:

[0031] Step 1. Select an austenitic stainless steel billet with a cylindrical shape and a cross-sectional diameter of 30 mm, and then use a roller die drawing machine to perform first roll die drawing on the austenitic stainless steel billet to obtain the first drawn billet The drawing of the first roll die is cold drawing, and the processing rate of the drawing of the first roll die is 75%; the cross-sectional shape of the first drawn bar blank is nearly circular, and the average size of the cross-sectional diameter is 15mm;

[0032] Step 2: Heating the first drawn billet described in step 1 by means of electrification, and simultaneously using an infrared thermometer to monitor the temperature of the first drawn billet in real time, and conducting current monitoring according to the measured temperature. Adjust the temperat...

Embodiment 2

[0042]The preparation method of the austenitic stainless steel rod for nuclear power reactor of the present embodiment comprises the following steps:

[0043] Step 1. Select an austenitic stainless steel billet with a cylindrical shape and a cross-sectional diameter of 35 mm, and then use a roller die drawing machine to perform first roll die drawing on the austenitic stainless steel billet to obtain the first drawn billet The drawing of the first roll die is cold drawing, and the processing rate of the drawing of the first roll die is 80%; the cross-sectional shape of the first drawn bar blank is nearly circular, and the average size of the cross-sectional diameter is 15.65mm;

[0044] Step 2: Heating the first drawn billet described in step 1 by means of electrification, and simultaneously using an infrared thermometer to monitor the temperature of the first drawn billet in real time, and conducting current monitoring according to the measured temperature. Adjust the temper...

Embodiment 3

[0054] The preparation method of the austenitic stainless steel rod for nuclear power reactor of the present embodiment comprises the following steps:

[0055] Step 1. Select an austenitic stainless steel billet with a cylindrical shape and a cross-sectional diameter of 30 mm, and then use a roller die drawing machine to perform first roll die drawing on the austenitic stainless steel billet to obtain the first drawn billet The drawing of the first roll die is cold drawing, and the processing rate of the drawing of the first roll die is 75%; the cross-sectional shape of the first drawn bar blank is nearly circular, and the average size of the cross-sectional diameter is 15mm;

[0056] Step 2: Heating the first drawn billet described in step 1 by means of electrification, and simultaneously using an infrared thermometer to monitor the temperature of the first drawn billet in real time, and conducting current monitoring according to the measured temperature. Adjust the temperat...

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Abstract

The invention provides a manufacturing method for an austenitic stainless steel bar used for a nuclear power reactor. The manufacturing method includes the following steps that firstly, first roller die drawing is conducted on the austenitic stainless steel bar, and a first drawing bar blank is obtained; secondly, first solid solution treatment is conducted on the first drawing bar blank; thirdly, second roller die drawing is conducted, and a second drawing bar blank is obtained; fourthly, the second drawing bar blank is subjected to fixed die drawing; fifthly, second solid solution treatment is conducted; and sixthly, electric heating stretcher straightening and roller type straightening are conducted, and the austenitic stainless steel bar used for the nuclear power reactor is obtained. According to the manufacturing method, the dimensional tolerance of the manufactured austenitic stainless steel bar used for the nuclear power reactor is not larger than 0.02 mm, linearity is not larger than 0.2 mm / m, the mechanical performance completely meets the requirement for ASTM A276 technology conditions, a microscopic structure is uniform and small, a crystal boundary is clear, and obvious carbide precipitation does not exist.

Description

technical field [0001] The invention belongs to the technical field of stainless steel material processing, and in particular relates to a preparation method of austenitic stainless steel rods for nuclear power reactors. Background technique [0002] Austenitic stainless steel rods for nuclear power reactors are widely used in control components and fuel components as the key functional and structural materials of nuclear reactors. The specific application environment determines that there are very strict requirements on the processing method, material properties, dimensional accuracy and non-destructive testing of "nuclear grade" austenitic stainless steel bars. [0003] At present, austenitic stainless steel bars for nuclear power reactors are generally prepared by a combination of thermal processing and fixed die cold drawing; during finishing, a roller leveler is used for straightening, followed by grinding and polishing; but the existing processing The process has the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/06B21C37/04
CPCB21C37/04C21D8/065
Inventor 邢健韩军薛晶晶李红宇沈大吉齐星王艳刘杨董璞周龙海
Owner 西安诺博尔稀贵金属材料股份有限公司
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