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Production method for pre-melted slag for small-batch electroslag remelting

A technology of electroslag remelting and production method, applied in the field of electroslag remelting production, can solve problems such as difficulty, and achieve the effects of convenient use, reduced moisture absorption performance, and avoiding slag collapse

Active Publication Date: 2018-05-15
XINGTAI IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the large capacity of smelting equipment (generally more than 3 tons), this production method is very efficient and suitable for mass production, but for some small batches of special steel or pre-melted slag required for test steel, due The amount of pre-melted slag required is very small, so it is difficult to apply this method to organize production

Method used

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  • Production method for pre-melted slag for small-batch electroslag remelting
  • Production method for pre-melted slag for small-batch electroslag remelting
  • Production method for pre-melted slag for small-batch electroslag remelting

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Effect test

Embodiment 1

[0024] The production method of pre-melted slag for small batch electroslag remelting of the present embodiment comprises the following steps:

[0025] (1) The outer shell is welded with ordinary steel plates, the inner lining is built with refractory materials, and a slag bag with a capacity of 300kg is selected;

[0026] (2) Take pre-melted slag raw materials, fluorite: 45%, lime: 20%, magnesia: 5%, industrial alumina: 25%, quartz sand: 5%, and put them into a slag baking furnace at 820°C for pre-processing Heat baking, after 8 hours of heat preservation, the temperature is lowered to 300°C and kept at a constant temperature for use;

[0027] (3) Use double graphite electrodes in series with the electroslag furnace, adjust the graphite electrode to be located in the center of the slag bag and 20mm away from the bottom of the bag, insert coke or waste carbon block between the two graphite electrodes as an arc ignition agent, and send electricity to start the arc. After the a...

Embodiment 2

[0034] The production method of pre-melted slag for small batch electroslag remelting of the present embodiment comprises the following steps:

[0035] (1) The outer shell is welded with ordinary steel plates, the inner lining is built with refractory materials, and a slag bag with a capacity of 300kg is selected;

[0036] (2) Take pre-melted slag raw materials, fluorite: 55%, lime: 8%, magnesia: 15%, industrial alumina: 15%, quartz sand: 7% as pre-melted slag raw materials, with a total weight of 300kg, put Preheat and bake in a 780°C slag baking oven, keep warm for 10 hours, and then drop to a constant temperature of 350°C for use;

[0037] (3) Use double graphite electrodes in series with the electroslag furnace, adjust the graphite electrode to be located in the center of the slag bag and 20mm away from the bottom of the bag, insert coke or waste carbon block between the two graphite electrodes as an arc ignition agent, and send electricity to start the arc. After the arc...

Embodiment 3

[0044] The production method of pre-melted slag for small batch electroslag remelting of the present embodiment comprises the following steps:

[0045] (1) The outer shell is welded with ordinary steel plates, the inner lining is built with refractory materials, and a slag bag with a capacity of 300kg is selected;

[0046] (2) Take pre-melted slag raw materials, fluorite: 70%, lime: 5%, magnesia: 10%, industrial alumina: 10%, quartz sand: 5% as pre-melted slag raw materials, with a total weight of 300kg, put Put it into a 790°C slag oven for preheating and baking, and after keeping it for 9 hours, the temperature will drop to 320°C for use;

[0047] (3) Use double graphite electrodes in series with the electroslag furnace, adjust the graphite electrode to be located in the center of the slag bag and 20mm away from the bottom of the bag, insert coke or waste carbon block between the two graphite electrodes as an arc ignition agent, and send electricity to start the arc. After ...

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Abstract

The invention discloses a production method for pre-melted slag for small-batch electroslag remelting. The production method comprises the steps that firstly, a slag melting bag with the volume being300 kg is selected and used; secondly, pre-melted slag raw materials are taken to be preheated and baked in a slag baking furnace; thirdly, the baked pre-melted slag raw materials with the weight being smaller than or equal to 300 kg in the second step are placed in the slag melting bag in the first step, a double-pole series connection electroslag furnace is used for arc strike for slag melting in the slag melting bag, and after slag melting is over, the slag liquid is poured into a steel tank to be cooled and solidified; and fourthly, slag blocks solidified in the third step are crushed through a small crusher, and the slag blocks serve as pre-melted slag for electroslag remelting after being weighed. The double-pole series connection electroslag furnace is utilized for slag melting in the slag melting bag, production of small-batch pre-melted slag with the weight being smaller than or equal to 300 kg is achieved, and the problem that pre-melted slag for the small-batch test steel grade is hard to produce and purchase is solved. The method is simple, convenient to use and worthy of popularization and application.

Description

technical field [0001] The invention belongs to the technical field of electroslag remelting production, and in particular relates to a production method of pre-melted slag for small-batch 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. Slag is an indispensable and important raw material in the field of electroslag metallurgy. It plays an important role in heating, refining and ingot forming in electroslag metallurgy. The quality of the slag used directly affects the quality of the final product. [0003] Because pre-melted slag has a series of advantages such as easy arcing and slag melting, short time, not easy to slag collapse, extremely low water content, good quality at the bottom of the steel ingot, high yield, not easy to add hydrogen to the steel type, and reduced energy consumption, etc., more and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B9/18
Inventor 姜方赵虎郭保善吕士刚毛建新赵雷李江涛于彬李晨哲李昭澎
Owner XINGTAI IRON & STEEL
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