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A kind of manufacturing method of low-silicon and high-nitrogen ferrite/martensitic steel billet

A manufacturing method and martensitic steel technology, applied in the field of metallurgical materials, can solve problems such as component breakage, and achieve the effects of good impact performance, improved radiation resistance, and radiation embrittlement resistance.

Active Publication Date: 2022-03-11
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the temperature of component loading and unloading operation is lower than the ductile-brittle transition temperature of the material, there will be a risk of component damage

Method used

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  • A kind of manufacturing method of low-silicon and high-nitrogen ferrite/martensitic steel billet
  • A kind of manufacturing method of low-silicon and high-nitrogen ferrite/martensitic steel billet
  • A kind of manufacturing method of low-silicon and high-nitrogen ferrite/martensitic steel billet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0132] Embodiment 1: Manufacture and inspection of low-silicon and high-nitrogen ferrite / martensitic billets (1)

[0133] The low-silicon and high-nitrogen ferrite / martensitic billet for the hexagonal tube of the sodium-cooled fast reactor core prepared in this embodiment has a diameter of 241 mm and a length of 6000 mm. The manufacturing process includes the following steps.

[0134] 1) Vacuum induction smelting

[0135] (1) A 6-ton vacuum induction furnace is used for smelting, and the smelting chamber is vacuumed to ≤1.0Pa in an empty furnace state.

[0136] (2) Furnace with raw materials.

[0137] (3) Refining after power transmission and melting to chemical clearing, the refining vacuum degree is controlled at ≤5.0Pa, and the refining temperature is 1560°C.

[0138] (4) The alloying period is entered after refining, and the vacuum degree in the early stage should be ≤ 5.0Pa. The temperature in the alloying period is ≤1570°C, and the composition is fine-tuned according ...

Embodiment 2

[0155] Embodiment 2: Manufacture and inspection of low-silicon and high-nitrogen ferrite / martensitic billets (two)

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Abstract

The invention belongs to the technical field of metallurgical materials, and relates to a method for manufacturing a low-silicon and high-nitrogen ferrite / martensitic billet. The manufacturing method includes the following steps in turn: (1) low-silicon and high-nitrogen ferrite / martensitic steel batching vacuum induction furnace smelting; (2) electroslag remelting; (3) remelting ingot forging: adopting vacuum induction Electroslag remelting, no rare earth elements are added during the smelting process, and after the ingot is heated, fast forging machine forging, precision forging machine forging, and annealing after forging are successively carried out. Utilizing the manufacturing method of the low-silicon and high-nitrogen ferrite / martensitic steel slab of the present invention, a ferrite / martensitic slab with better impact performance and radiation embrittlement resistance can be obtained for subsequent fast reactor cores Machining and fabrication of hexagonal outer sleeves for components.

Description

technical field [0001] The invention belongs to the technical field of metallurgical materials, and relates to a method for manufacturing a low-silicon and high-nitrogen ferrite / martensitic billet. Background technique [0002] The sodium-cooled fast neutron reactor (hereinafter referred to as fast reactor) is a fourth-generation nuclear energy system. Compared with heavy water reactor or pressurized water reactor, the core fuel assembly needs to achieve higher burnup at a higher temperature. [0003] The hexagonal tube in the fast reactor fuel assembly is one of the most important parts in the reactor core. It works in the temperature range of 360-600°C for a long time, and is corroded by the coolant sodium and damaged by high-dose radiation above 100dpa. With the increase of fast reactor fuel burnup, the anti-swelling performance of austenitic stainless steel is poor under high irradiation dose, which will lead to the decline of mechanical properties of the material and th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/06C22B9/18C21D8/00C22C38/02C22C38/44C22C38/46C22C38/04C22C38/06C22C38/48C22C38/50C22C38/42C22C38/52
CPCC22C33/06C22B9/18C21D8/005C22C38/02C22C38/001C22C38/44C22C38/46C22C38/04C22C38/06C22C38/48C22C38/50C22C38/42C22C38/52C21D2211/005C21D2211/008Y02P10/25
Inventor 李峻宏苏喜平杜爱兵冯伟任媛媛王明政黄晨杨勇刘兴民杨孔雳张东辉郝宪朝梁田邢炜炜刘奎
Owner CHINA INSTITUTE OF ATOMIC ENERGY