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Covering argon blowing protective casting process and device of induction furnace molten steel

A technology for protecting pouring and induction furnaces, applied in the field of casting, can solve the problems of increasing non-metallic inclusions in castings, deteriorating the performance of castings, etc., and achieves the effects of reducing argon gas consumption, reducing production costs, and simple device structure

Active Publication Date: 2013-12-18
TAIZHOU XINYU PRECISION MFG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such pouring operation will bring new secondary oxidation, that is, the oxidation of molten steel or molten iron in the pouring process, which increases the non-metallic inclusions in the casting and deteriorates the performance of the casting, especially for easy two This is especially true for sub-oxidized stainless steel, heat-resistant steel, and heat-resistant alloy castings

Method used

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  • Covering argon blowing protective casting process and device of induction furnace molten steel

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Experimental program
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Effect test

Embodiment 1

[0039] Embodiment 1: Utilize the induction furnace 14 that capacity is 100kg to melt No. 45 carbon steel liquids, when the temperature of No. 45 carbon steel liquids 10 reaches 1580 ℃, remove all the molten slag on furnace hearth 12 tops, sprinkle into 0.5kg protection again Slag, the composition (mass percentage) of the slag is: SiO 2 75%, Al 2 o 320%, MgO 2%, CaO 1.998%, ZrO 1%, C<0.001%, FeO<0.002%; stand for 1 minute, the thickness of the slag hard shell 7 is 2mm; when the induction furnace 14 starts to tilt, the No. 45 When the molten carbon steel 10 is poured into the investment casting mold shell, adjust the pressure of the gas pressure gauge 5 to be 0.001 MPa, adjust the flow rate of the gas flow gauge 4 to be 2 liters per minute, and introduce argon into the No. 45 carbon steel in the furnace 12. In the gap between the upper surface of the molten steel 10 and the slag hard shell 7, a layer of argon protective gas film is formed on the upper surface of the No. 45 c...

Embodiment 2

[0040] Embodiment 2: Utilize the induction furnace 14 that capacity is 100kg to melt No. 45 carbon steel molten steel, when the temperature of No. 45 carbon steel molten steel 10 reaches 1580 ℃, remove all the slag on the top of the furnace 12, and sprinkle 5 kg of mold slag Material, the composition (mass percentage) of slag is: SiO 2 75%, Al 2 o 3 20%, MgO 2%, CaO 1.998%, ZrO 1%, C<0.001%, FeO<0.002%; stand for 3 minutes, the thickness of slag hard shell 7 is 30mm; When the molten carbon steel 10 is poured into the investment casting mold shell, adjust the pressure of the gas pressure gauge 5 to be 0.01MPa, adjust the flow rate of the gas flow gauge 4 to be 200 liters per minute, and introduce argon into the No. 45 carbon dioxide in the furnace 12. In the gap between the upper surface of the molten steel 10 and the slag hard shell 7, a layer of argon protective gas film is formed on the upper surface of the No. 45 carbon steel molten 10, thereby significantly reducing s...

Embodiment 3

[0041] Embodiment 3: Melt No. 45 carbon steel molten steel with an induction furnace 14 with a capacity of 1000 kg. When the temperature of No. 45 carbon steel molten steel 10 reaches 1580 ° C, all the slag on the top of the furnace 12 is removed, and then 10 kg of mold slag is sprinkled Material, the composition (mass percentage) of slag is: SiO 2 75%, Al 2 o 3 20%, MgO 2%, CaO 1.998%, ZrO 1%, C<0.001%, FeO<0.002%; stand for 2 minutes, the thickness of slag hard shell 7 is 15mm; When the molten carbon steel 10 is poured into the investment casting mold shell, adjust the pressure of the gas pressure gauge 5 to be 0.005 MPa, adjust the flow rate of the gas flow gauge 4 to be 150 liters per minute, and introduce argon into the No. 45 carbon dioxide in the furnace 12. In the gap between the upper surface of the molten steel 10 and the slag hard shell 7, a layer of argon protective gas film is formed on the upper surface of the No. 45 carbon steel molten 10, thereby significa...

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Abstract

The invention discloses a covering argon blowing protective casting process and device of induction furnace molten steel. After the deoxidization treatment of the induction furnace molten steel is completed and all deoxidization slag is removed, a slag charge is spread on the surface of the molten steel to completely cover the surface of the molten steel; after standing for 1-3 minutes, a slag charge hard cover covering the surface of the molten steel is formed; a hole is formed in the slag charge hard cover, the outlet of an argon blowing stainless steel tube is put through the hole into a gap between the surface of the molten steel and the slag charge hard cover, argon is blown in and the normal gas pressure is maintained; before casting of the molten steel, a steel outlet is cut out or stabbed out at the edge of the slag charge hard cover near a steel tapping spout; for the casting of molten steel, argon is continuously blown into the gap between the surface of the molten steel liquid and the slag charge hard cover and the normal gas pressure is maintained until casting is finished. For the casting of the induction furnace molten steel, an argon protective layer is formed on the surface of the molten steel; as a result, secondary oxidization of the molten steel in the hearth is obviously reduced, the cleanliness and inherent quality of castings are remarkably improved, and the consumption of argon in the whole process is low and the production cost is low.

Description

technical field [0001] The invention relates to the field of casting, in particular to an induction furnace molten steel covered argon blowing protective pouring process and device. Background technique [0002] Induction furnaces are commonly used melting and smelting equipment in the field of foundry and metallurgy, mainly including inductors, furnaces, furnace covers, furnace dumping hydraulic systems, water-cooled cables or copper bars, induction power supplies, and cooling water systems. The furnace is located in the inductor, the furnace cover is placed on the upper opening of the furnace, the induction power is connected to the inductor through copper bars or water-cooled cables, and the cooling water is connected to the induction power, inductors, water-cooled cables or copper bars. When melting and smelting steel, first start the cooling water system, force water to cool the induction power supply, water-cooled cables or copper bars, and inductors, and then turn on ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/072C21C7/076B22D1/00
CPCY02P10/20
Inventor 毛卫民荆剑王小东康燕许杜生颜平
Owner TAIZHOU XINYU PRECISION MFG CO LTD