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Nuclear stainless steel electroslag remelting slag used for high-level radioactive waste curing container and method adopting electroslag remelting

A technology of glass solidification and electroslag remelting, applied in the field of metal material metallurgy, can solve problems such as the inability to meet the technical requirements of nuclear-grade stainless steel for glass solidification containers of high-level waste liquids, and achieve significant social and economic benefits and good mechanical properties. , The effect of stable and controllable ingredients

Inactive Publication Date: 2020-10-09
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

[0026] The counterweight of electroslag remelting slag material for nuclear-grade stainless steel used in vitrification containers for high-level radioactive waste is designed to be 90kg / 1 furnace, and the proportion of slag system is: CaF 2 : 58.5kg (65%), CaO: 9.0kg (10%), Al 2 o 3 : 10.8kg (12%), MgO: 7.2kg (8%), SiO 2 : 2.7kg (3%), CeO 2 : 1.8kg (2%).

[0027] The electroslag remelting electrode counterweight of nuclear-grade stainless steel used for high-level waste vitrification containers is designed to be 1500kg, and it is cast into a Φ300mm round rod by vacuum induction melting. The chemical composition is: C: 0.09%, Cr: 21.5%, Ni: 11.5 %, Si: 2.0%, Mn: 0.65%, N: 0.14%, Ce: 0.04%, Co: 0.01%, B: 0.0018%, Cu: 0.017%, V: 0.005%, Fe: 64.08%. Electroslag remelted electrode rods were prepared after removing the surface scale.

[0028] The above-mentioned slag material is prepared and fully mixed and then baked at 800℃×8h. The slag is melted and arced in a Φ500mm crysta...

Embodiment 2

[0033] The electroslag remelting slag counterweight of nuclear-grade stainless steel used for vitrification containers of high-level radioactive waste is set to 130kg / 1 furnace, and the proportion of slag system is: CaF 2 : 78kg (60%), CaO: 19.5kg (15%), Al 2 o 3 : 13kg (10%), MgO: 11.4kg (8%), SiO 2 : 5.2kg (4%), CeO 2 : 3.9kg (3%)

[0034] The electroslag remelting electrode counterweight of nuclear-grade stainless steel for high-level waste vitrification containers is designed to be 2500kg, and it is cast into a Φ400mm round rod by vacuum induction melting. The chemical composition is: C: 0.12%, Cr: 22.5%, Ni: 12.5%, Si: 0.8%, Mn: 1.2%, N: 0.10%, Ce: 0.05%, Co: 0.01%, B: 0.0015%, Cu: 0.02%, V: 0.017%, Fe: 62.7%. Electroslag remelting electrode rods are reserved for electroslag remelting after the surface scale is removed.

[0035] The above-mentioned slag is prepared and fully mixed, then baked at 800°C for 12 hours, and then the slag is melted and arced in a Φ600mm cr...

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Abstract

The invention relates to nuclear stainless steel electroslag remelting slag used for high-level radioactive waste curing container and a method adopting electroslag remelting. The slag comprises, by weight part, 55 to 70 parts of CaF2, 8 to 15 parts of CaO, 8 to 15 parts of Al2O3, 5 to 15 parts of MgO, 1 to 5 parts of SiO2 and 1 to 5 parts of CeO2, a slag remelting method is adopted, rare earth inthe stainless steel can be stably controlled, harmful impurities can be greatly reduced, the structure is uniform and compact, the alloy machining performance can be greatly improved, the yield rateis improved, the good mechanical property, and good properties of high temperature resistance, corrosion resistance, oxidation resistance and the like are achieved, good hot and cold machining performance, welding performance and machining performance are achieved, and the method has the wide application prospect in the nuclear waste treatment field.

Description

technical field [0001] The invention belongs to the field of metal material metallurgy, and particularly relates to a nuclear-grade stainless steel electroslag remelting slag material used for high-level radioactive waste vitrification containers and a method using the electroslag remelting method. Background technique [0002] The utilization of nuclear energy includes power generation or provision of nuclear power (nuclear power plants, boat-borne, ship-borne or space-borne nuclear reactors), activation analysis (analysis of material composition), radioactive reconnaissance, detection and flaw detection, medical killing or elimination of cancer cells, agricultural improvement New varieties, seawater desalination, nuclear weapons (atomic bombs, hydrogen bombs) manufacturing, etc., have an important position and role in national economy and national defense security. During the entire industrial process of nuclear energy development and utilization, a large amount of radioac...

Claims

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Application Information

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IPC IPC(8): C22B9/18B22D23/10C22C38/02C22C38/04C22C38/42C22C38/46C22C38/52C22C38/54C22C38/58
CPCB22D23/10C22B9/18C22C38/001C22C38/005C22C38/02C22C38/04C22C38/42C22C38/46C22C38/52C22C38/54C22C38/58Y02P10/25
Inventor 刘海定陈登华王东哲何曲波郑建能刘应龙徐永福王志峰
Owner CHONGQING MATERIALS RES INST
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