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A method for manufacturing a nuclear reactor fuel channel zirconium alloy pressure tube

A nuclear reactor fuel and manufacturing method technology, which is applied in the field of metal material preparation, can solve the problems of the mature preparation process of pressure tubes without heavy water reactors, and the large difference in processing and deformation mechanisms, so as to improve the organization consistency of the head and tail, good organization consistency, and improved The effect of processing efficiency

Active Publication Date: 2021-11-16
西安西部新锆科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, different from the single α-phase zirconium alloy used for common fuel cladding, Zr-2.5Nb is an α+β dual-phase zirconium alloy, and its stable room temperature structure should be α-Zr+β-Nb, and its processing deformation mechanism is similar to that of The zirconium alloys used for ordinary fuel cladding are quite different, so the microstructure control is a difficult point in the manufacturing process of nuclear reactor fuel channel pressure tubes
There is no mature preparation process for heavy water reactor pressure tubes in China

Method used

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  • A method for manufacturing a nuclear reactor fuel channel zirconium alloy pressure tube
  • A method for manufacturing a nuclear reactor fuel channel zirconium alloy pressure tube

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Embodiment 1

[0035] This embodiment includes the following steps:

[0036] Step 1. Heat the Zr-2.5Nb alloy ingot to 1100°C for 210 minutes, and then use the upsetting and drawing process to forge the first fire. After the primary forging billet is ground, it is heated to 1000°C and kept for 120 minutes, and then the second forging is carried out, and the forging ratio is 2.3 to obtain a forged rod with a diameter of 230mm;

[0037] Step 2: Grind the forged bar obtained in step 1, cut it into sections, and rough turn it, and then process a hole with a diameter of 45mm by wire cutting at the center of the short bar after rough turning to obtain a fixed-length hollow bar blank. The fixed-length hollow billet is machine-heated to 800°C with an induction furnace and kept warm for 20 minutes, then extruded and expanded to obtain a hollow billet with an inner hole enlarged to 120mm; the hollow billet is heated to 1100°C by an induction furnace and kept warm 5min, and then completed within 20s ou...

Embodiment 2

[0049] This embodiment includes the following steps:

[0050] Step 1. Heat the Zr-2.5Nb alloy ingot to 850°C and keep it warm for 60 minutes, and then use the process of upsetting and drawing and then drawing for the first fire forging, the forging ratio is 5.9, and a forged rod with a diameter of 200mm is obtained;

[0051] Step 2: Grind the forged bar obtained in step 1, cut it into sections, and rough turn it, and then process a hole with a diameter of 40 mm at the center of the short bar after rough turning to obtain a pre-drilled bar blank. After the pre-drilled billet is machined, it is heated to 850°C with an induction furnace and held for 10 minutes, and then extruded to expand the hole to obtain a fixed-length hollow billet with an inner hole enlarged to 110mm; after the hollow billet is heated to 950°C by a resistance furnace And keep it warm for 30 minutes, then complete the furnace within 35s, and then water quench and cool to room temperature to obtain a quenched ...

Embodiment 3

[0056] This embodiment includes the following steps:

[0057] Step 1: Heat the Zr-2.5Nb alloy ingot to 1050°C for 240 minutes, and then use the upsetting and drawing process to carry out 1-shot blank forging with a forging ratio of 4.2 to obtain a 1-shot forged billet with a diameter of 450 mm. After the primary forging billet is ground, heat it to 950°C and keep it warm for 150 minutes, then carry out the second forging and forging with a forging ratio of 2.3 to obtain a secondary forging billet with a diameter of 300mm, and grind the secondary forging billet After heating to 850°C and holding it for 120min, and the forging ratio is 2.3, a forged rod with a diameter of 200mm is obtained;

[0058] Step 2. Grind the forged rod obtained in step 1, cut it into sections, and rough turn it, and then drill a hole with a diameter of 100 mm at the center of the short rod after rough turning to obtain a fixed-length hollow bar. The ruler hollow billet is heated to 950°C in an inductio...

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Abstract

The invention discloses a method for manufacturing a zirconium alloy pressure tube of a nuclear reactor fuel channel. The method comprises: 1. heating and forging a Zr-2.5Nb alloy ingot to obtain a forged rod; Heating and heat preservation, quenching and cooling with water out of the furnace to obtain a quenched hollow billet; 3. The quenched hollow billet is lubricated by a machine, heated and maintained, and extruded to obtain an extruded tube billet; 4. The extruded tube billet is straightened and surface machined in turn Cold-rolling to obtain a cold-rolled tube blank; 5. The cold-rolled tube blank is sequentially straightened, surface machined, degreased and pickled, and subjected to stress relief annealing to obtain a zirconium alloy pressure tube. The invention improves the uniformity and consistency of the microstructure and performance of the zirconium alloy pressure tube by controlling the Zr-2.5Nb alloy ingot heating forging, hollow billet processing, quenching, heating extrusion, cold rolling and annealing, and ensures the uniformity of the pipe material At the same time, the dimensional uniformity accuracy of the zirconium alloy pressure tube is improved, making it suitable for nuclear reactor fuel channels.

Description

technical field [0001] The invention belongs to the field of metal material preparation, and in particular relates to a method for manufacturing a zirconium alloy pressure tube of a nuclear reactor fuel channel. Background technique [0002] Due to its excellent nuclear properties, metal zirconium is used as the nuclear fuel cladding material of atomic energy reactors and other structural materials of the core. It is almost irreplaceable in water-cooled reactors, so it is known as "the first metal in the atomic age". Also controlled strategic material. Because zirconium alloy materials serve under harsh conditions, due to nuclear safety considerations, the performance and quality of materials are extremely high, so the zirconium alloy processing industry is a technology-intensive high-tech industry. [0003] At present, zirconium alloys used and developed in nuclear engineering are mainly divided into Zr-Sn series, Zr-Nb series and Zr-Sn-Nb series, such as Zr-4, E110, E635,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/18C21D8/10C22C16/00B21C37/06
Inventor 周宣李新意张建军田锋周军李科元田航徐萌渠静雯
Owner 西安西部新锆科技股份有限公司
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