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Slag material for electroslag remelting of nuclear-grade stainless steel and method for electroslag remelting by slag material

An electroslag remelting and stainless steel technology, applied in the field of smelting, can solve the problems of excessive content of harmful elements, excessive non-metallic inclusions, high content of harmful elements, etc., to reduce the content of harmful elements, improve the uniformity of components, and reduce the content of harmful elements. Effect

Active Publication Date: 2019-01-01
CHONGQING MATERIALS RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Uniformity is one of the main problems in metallurgical quality control. For electroslag ingots prepared by ordinary methods, the carbon content at the bottom will usually increase, and the content of silicon, titanium, aluminum and other elements will decrease, resulting in uneven composition of the steel ingot.
On the other hand, during the electroslag remelting process, the decomposition of some components of the slag will cause changes in the composition of the slag, resulting in changes in the metallurgical and technological properties of the slag, and ultimately lead to uneven distribution of elements in the height direction of the ingot
The uneven composition of the steel ingot will cause the structure and performance of the final product to be uneven. In serious cases, it cannot be used and the product will be scrapped.
[0007] At present, the metallurgical quality of nuclear-grade stainless steel produced by some manufacturers is poor, which leads to scrapping. Poor uniformity or substandard performance

Method used

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  • Slag material for electroslag remelting of nuclear-grade stainless steel and method for electroslag remelting by slag material
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  • Slag material for electroslag remelting of nuclear-grade stainless steel and method for electroslag remelting by slag material

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0043] Example 1 prepares 316L stainless steel electroslag ingot

[0044] 1) electrode rod preparation

[0045] Use a 500kg vacuum induction melting furnace for smelting, pour the molten steel described in Table 1 into a φ170mm electrode rod, sand the surface of the electrode rod to remove the scale, and then weld the electrode rod and the dummy electrode together.

[0046] The main element composition of table 1 molten steel is shown in the following table:

[0047]

[0048] 2) Slag material preparation

[0049] The proportion of slag is (weight percent): CaF 2 60%, MgF 2 6%, Al 2 O 3 16%, CaO 10.5%, MgO7%, BaO 0.5%, the total weight of slag is 30kg. CaF 2 , MgF 2 , Al 2 O 3, MgO, and BaO are mixed and baked at 800°C for 5h, and CaO is baked alone at 930°C for 6h. Use the electrode rod described in step 1) to melt slag, add the pre-mixed slag gradually (add slag in batches, add the next batch after the added slag is melted) into the crystallizer, energize and...

example 2

[0053] Example 2 prepares Gr.B8M stainless steel electroslag ingot

[0054] 1) electrode rod preparation

[0055] Use a 500kg vacuum induction melting furnace for smelting, pour the molten steel described in Table 2 into an electrode rod with a diameter of φ170mm, sand the surface of the electrode rod to remove the scale, and then weld the electrode rod and the dummy electrode together.

[0056] The main element composition of table 2 molten steel is shown in the table below:

[0057]

[0058] 2) Slag material preparation

[0059] The proportion of slag is (weight percent): CaF 2 60%, MgF 2 6%, Al 2 O 3 12%, CaO 15%, MgO 6.5%, BaO 0.5%, the total weight of slag is 30kg. CaF 2 , MgF 2 , Al 2 O 3 , MgO, and BaO are mixed and baked at 800°C for 5h, and CaO is baked alone at 930°C for 6h. Use the electrode rod described in step 1) to melt the slag, add the pre-mixed slag gradually (add the slag in batches, add the next batch after the added slag is melted) into the c...

example 3

[0063] Example 3 prepares 304 stainless steel electroslag ingots

[0064] 1) electrode rod preparation

[0065] Use a 3000kg vacuum induction melting furnace for smelting, pour the molten steel described in Table 3 into a φ400mm electrode rod, sand the surface of the electrode rod to remove scale, and then weld the electrode rod and the dummy electrode together.

[0066] The main element composition of table 3 molten steel is shown in the following table:

[0067]

[0068] 2) Slag material preparation

[0069] The proportion of slag is (weight percent): CaF 2 55%, MgF 2 8%, Al 2 O 3 15%, CaO 15%, MgO 7%, the total weight of slag is 100kg. CaF 2 , MgF 2 , Al 2 O 3 , and MgO are mixed and baked at 800°C for 5h, and CaO is baked alone at 930°C for 6h. Use the electrode rod described in step 1) to melt the slag, add the pre-mixed slag gradually (add the slag in batches, add the next batch after the added slag is melted) into the crystallizer, energize and start the a...

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Abstract

The invention relates to a slag material for electroslag remelting of nuclear-grade stainless steel and a method for electroslag remelting by the slag material. The slag material is prepared from thefollowing components in percentage by weight: 40 to 70% of CaF2, 1 to 10% of MgF2, 10 to 20% of Al2O3, 10 to 20% of CaO, 1 to 10% of MgO, and 0 to 3% of BaO. The preparation method of an electroslag ingot mainly comprises the following steps of preparation of an electrode rod, preparation of the slag material, and electroslag remelting. The prepared electroslag ingot has the advantages that the content of harmful elements of Co, B, Pb, Sn, H, P, S and the like is low, the surface quality is high, the components are uniform, the segregation is little, the microstructures are fine and dense, thesum of nonmetallic inclusions is lower than or equal to Grade 2.0, and the metallurgical quality requirement of the nuclear-grade stainless steel is met.

Description

technical field [0001] The invention relates to a smelting method, in particular to a slag material used for electroslag remelting of nuclear-grade stainless steel and a method for using the slag material to carry out electroslag remelting. Background technique [0002] Electroslag remelting is a process that uses the resistance heat generated by liquid slag to melt, refine and solidify metal consumable electrodes in a crystallizer. Electroslag steel has many advantages such as pure metal, compact structure, uniform composition, and excellent performance. Electroslag remelting technology has been an important means of producing special alloy materials since its inception. [0003] Slag is an essential and important raw material in the field of electroslag metallurgy. Its slag formula and application method determine the metallurgical quality of the final product. [0004] The process technology of electroslag remelting includes electric system, slag system, temperature syst...

Claims

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Application Information

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IPC IPC(8): C22B9/18C22C33/04
CPCC22B9/18C22C33/04Y02P10/25
Inventor 何曲波刘海定王东哲吴畏王方军吕晓敏赵安中
Owner CHONGQING MATERIALS RES INST
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