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Stainless steel slagging and degassing refining agent

A refining agent and stainless steel technology, applied in the field of casting auxiliary materials, can solve the problems of inability to reduce subcutaneous black spots of workpieces, unsatisfactory thermal insulation and degassing effect, and insignificant use effect, so as to reduce subcutaneous black spots and achieve good thermal insulation and degassing effect. , to avoid the effect of heat loss

Inactive Publication Date: 2006-11-29
张华静
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main reasons are: 1. The use effect is not obvious, and the subcutaneous black spots of the workpiece, black spots and pitting on the surface of the polished piece cannot be reduced, thereby greatly reducing the yield of the product; 2. The effect of heat preservation and degassing is not ideal, and the slag removal Trouble, there are still a lot of slag inclusions; 3. The furnace wall is severely eroded. Since the furnace lining is made of magnesia (MgO), the molten steel rolls in the furnace lining, which will wash the furnace lining, and a small amount of magnesia will fall into the molten steel, causing the furnace lining Under normal circumstances, a furnace lining can be used for 150-180 times, but after using slagging agent, it can only be used within 100 times

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Get dolomite (CaMgCO 3 ) is: 70, aluminum powder (Al 2 o 3 ) is: 15, fluorite (CaF 2 ) is: 15. The slag-forming and degassing refining agent is made by uniform mixing at room temperature, weighed and bagged as required, and the finished product is packaged and put into storage. Dolomite and fluorite are powdery.

[0014] The method of using the slagging and degassing refining agent prepared from the formula in this example is as follows: it is used in a large steel factory. Put 0.3-0.5 slagging and degassing refining agent of molten steel weight on the bottom of the furnace. When the temperature measurement of the molten steel reaches the temperature required by the smelting process, adjust it upwards by 20-30°C, then turn off the power and let it stand for a period of time. Slightly shake the molten steel to make the slag float up as soon as possible. At this time, do not do any slag removal action (that is, do not sprinkle slag remover), if the temperature is wor...

Embodiment 2

[0017] Get dolomite (CaMgCO 3 ) is: 75, aluminum powder (Al 2 o 3 ) is: 12.5, fluorite (CaF 2 ) is: 10.5, the slagging and degassing refining agent is made by uniform mixing at room temperature, weighed and bagged as required, and the finished product is packaged and put into storage. The sum of the percentages of the above components is 100% by weight. Using the slagging and degassing refining agent made by the formula in this example, and using the method in Example 1, it can be used in large steel plants to achieve the same effect as in Example 1. Pure molten steel makes the product comprehensive Performance is improved.

Embodiment 3

[0019] Get dolomite (CaMgCO 3 ) is: 80, aluminum powder (Al 2 o 3 ) is: 10, fluorite (CaF 2 ) is: 6. The slagging and degassing refining agent is made by mixing evenly at room temperature, weighing and bagging as required, and the finished product is packaged and put into storage. The sum of the percentages of the above components is 100% by weight. The slagging and degassing refining agent prepared by the formula in this example can also make the molten steel cleaner and have better performance after being used in the foundry.

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Abstract

This invention relates to a rustless steel slag-forming and degassing agent, which is specifically a casting accessory material to clean up rustless steel molten steel surface and improve rustless steel quality, and belong to metal surface treatment technique area in foundry industry. This agent mainly comprises 70-80 wt% of dolomite, 10-15 wt% of aluminum dust and 6-15 wt% of fluor. The components are mixed completely in normal temperature and packed to completed product. This invention possesses the properties of increasing life of brasque to more than 200 times; improving slag-forming ability to decrease endermic points, decrease surface points and pocks of buffing surface and increase rate of finished products and improving thermal insulation and degasification by floating constantly on the surface of molten steel, in which molten steel is prevented to contact with air and oxygenized, suck in hydrogen and nitrogen and interfused with foreign substance, so as to ensure cleaner molten steel higher property.

Description

technical field [0001] The invention relates to a stainless steel slagging and degassing refining agent, in particular to a casting auxiliary material used for purifying molten stainless steel and improving the quality of stainless steel, belonging to the technical field of foundry metallurgy. Background technique [0002] Before the present invention was made, in the prior art, the following three schemes were usually adopted for the slagging and degassing refining agent of molten steel surface treatment in the stainless steel foundry industry: 1, adopt lime (CaO), fluorite (CaF 2 ) mixed; 2, using lime (CaO), magnesium oxide (MgO), fluorite (CaF 2 ) mixed; 3, using lime (CaO), fluorite (CaF 2 ), aluminum powder (Al 2 o 3 ) mixed together. These slag-forming and degassing refining agents are mainly used in large steel mills, and less used in foundries. The main reasons are: 1. The use effect is not obvious, and the subcutaneous black spots of the workpiece, black spots...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/04B22D1/00
Inventor 张华静
Owner 张华静
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