Preparation method of nuclear-grade stainless steel for vitrification container of high-level radioactive waste

A vitrification and stainless steel technology, which is applied in the direction of manufacturing tools, heat treatment equipment, furnaces, etc., can solve the problems of not being able to meet the technical requirements of nuclear-grade stainless steel for high-level waste liquid vitrification containers, and achieve stable, uniform, controllable and improved components. Alloy yield, excellent high temperature resistance effect

Active Publication Date: 2021-09-28
CHONGQING MATERIALS RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the existing technology has basically met the manufacturing requirements of conventional austenitic stainless steel in terms of smelting, remelting, thermal processing, and cold processing, it still cannot meet the high requirements in terms of precise control of composition, control of trace elements, especially harmful elements. Technical requirements for nuclear-grade stainless steel for waste liquid vitrification containers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] High placed waste glass curing container weighs 1000kg of ingredients with rated stainless steel, each component ratio is: C: 0.1%, Cr: 21.5%, Ni: 11.3%, Si: 2.2%, MN: 0.65% N: 0.20%, CE: 0.25%, Fe: Yu.

[0033] Each component is taken as described above. The raw material such as Fe, Cr, Ni is placed in a crucible. When the inductance should be heated to the entire meteeration state, refining, refining temperature 1580 ~ 1620 ° C, vacuum degree 5 ~ 8Pa, refining time 25 kg / min; then add microalloyation element C , Si, Mn, thickened, completely melting; then filled with nitrogen, adding nitride iron in a nitrogen protection atmosphere, stirring, rapid addition of raw raw material CE to completely melting. Sampling analysis furnace before the nitrogen protection atmosphere and adjusted to meet the requirements. The steel liquid temperature was adjusted to 1520 to 1560 ° C, and the gas was cast into a φ260 mm round rod in a nitrogen protection atmosphere.

[0034] High-place...

Embodiment 2

[0041] Vitrified high-level radioactive waste container with a nuclear grade stainless steel batch weighing 2500kg, the component ratio by mass percent: C: 0.12%, Cr: 21.0%, Ni: 11.5%, Si: 2.0%, Mn: 0.65%, N: 0.18%, Ce: 0.25%, Fe: the remainder.

[0042] Each component is taken as described above. After the start Fe, Cr, Ni and the like placed in a crucible, the induction heating power to the fully molten state, refined temperature of 1580 ~ 1620 ℃, vacuum better than 10 Pa, the refining time 42kg / min; followed by addition of micro-alloying elements C, si, Mn, sufficiently stirred, completely melted; then purged with nitrogen, was added ferrochrome nitride in a nitrogen atmosphere, and stirred, after removing Ce and quickly added to the completely melted. Sampling analysis furnace before the nitrogen protection atmosphere and adjusted to meet the requirements. Adjusting the temperature of liquid steel to 1520 ~ 1560 ℃, under a nitrogen atmosphere at / min rate cast into 80kg Φ40...

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Abstract

The invention relates to a preparation method of nuclear-grade stainless steel for high-level waste vitrification containers. The nuclear-grade stainless steel for high-level waste vitrification containers prepared by the method of the invention can make the rare earth elements in it stable and controllable, and eliminate harmful impurities. The elements are greatly reduced, the structure is uniform and dense, the processing performance of the alloy is greatly improved, and the yield is increased. It has good mechanical properties, high temperature resistance, corrosion resistance, oxidation resistance, etc., as well as excellent hot and cold processing performance, welding performance and machining performance. The field of nuclear waste treatment has broad prospects for promotion and application.

Description

Technical field [0001] The present invention belongs to the field of metallurgy of metal material, and in particular, the present invention relates to a preparation method of high-grade stainless steel for high-placed waste glass curing vessel. Background technique [0002] The use of nuclear energy includes power generation or providing nuclear power (nuclear power plant, boat carrier, carrier or star nuclear reactor), activation analysis (analytical substance composition), radioactive reconnaissance, detection and detection, medicine to kill or eliminate cancer cells, agriculture improvement New varieties, seawater dilution, nuclear weapons (atomic bombs, hydrogen bombs) have an important role in national economic and national defense safety. During the development of nuclear energy development, during the industrial process, a large number of no longer need (at least the human beings cannot be effectively utilized) and has radioactive waste. Nuclear waste includes two types of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/04C22B9/18C22C38/02C22C38/04C22C38/34C22C38/42C22C38/46C22C38/52C22C38/54C22C38/58C21D1/00C21D6/00C21D8/02C21D9/00
CPCC21D1/00C21D6/004C21D6/005C21D6/008C21D8/0221C21D9/0081C22B9/18C22C33/04C22C38/001C22C38/002C22C38/005C22C38/02C22C38/04C22C38/34C22C38/42C22C38/46C22C38/52C22C38/54C22C38/58
Inventor 刘海定陈登华王东哲何曲波郑建能刘应龙徐永福何宏宇
Owner CHONGQING MATERIALS RES INST
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