Custom-Designed VOD/Vd Refining Furnace in Metal & Metallurgy Machinery

• Certification: ISO
• Range of Applications: Industrial
• Type: Vd/VOD Furnace
• Fuel: Electric
• Transport Package: Containers and Bulk Carriers
• Specification: 10t-120t
• Trademark: AE
• Origin: China
• Production Capacity: 100

Product Description

VD/VOD Furnace

In recent years, secondary vacuum refining technique gets popular and further developed. The heart of global metallurgical industry has transferred from quantitative to be variety diversification and high quality. The super purity index ( total [H],[N],[O],[S],[P] get 50ppm,or even lower) reflects the quality of product, The effective way to achieve super purity index is secondary vacuum refining technique. There are many ways of secondary vacuum refining, the most popular ways are:1, VD- ladle vacuum refining process.2, VOD- vacuum oxygen decarburization ladle vacuum refining process. 

VD/VOD ladle vacuum refining process strengthens blowing argon reasonably on the bottom of furnace; it can stir molten steel adequately and get ideal dynamics effect. If combining VD and LF, the furnace can get ideal molten steel refining temperature with easy structure and low cost. Both of the above process can dehydrogenize, denitrify, desulfurize, deoxidize under vacuum conditions and get the function of Vacuum Oxygen Decarburization (VOD) to achieve the purpose of refining super pure steel.

Vacuum pump system is the main equipment of vacuum refining device. Base on our ten years' experience of test research and generalized application, two series products - "Full steam jet vacuum pump system" and "Steam jet + water ring vacuum pump system" had formed. "Full steam jet vacuum pump series" uses a certain pressure water steam and cooling water as working medium of the pump, "Steam jet +water ring vacuum pump system" uses a certain steam pressure, less water steam and cooling water as working medium, and consume few electricity. The steam consumption of "Full steam jet vacuum pump" is relative high, and need to equip with bigger boiler, but the cost of vacuum pump itself is lower. The steam consumption of "Steam jet +water ring vacuum pump system" is relative low, and can equip with a smaller boiler, but the vacuum equipment itself cost higher. So the total invest cost of above system is basically consistent, both is satisfied the requirement of producing molten steel by secondary vacuum refining.

Our company is a Key enterprise and professional manufacturer of steam jet vacuum pump and whole vacuum equipments in China, and we are also the first corporation of design and produce VD/VOD Vacuum refining equipment and VC Vacuum Cast Equipment in China. Up to now, we had designed and produced more than 180 sets VD/VOD, RH vacuum refining equipment, VC vacuum casting equipment for more than 100 companies. All these equipment meet the requirements of design and well received by the end user.

 

Refining process description of VD furnace

1.Dehydrogenation

When the vacuum degree is ≤ 133Pa, the hydrogen content in the molten steel [H] is ≤ 1.5 ppm. Due to the fact thatthe hydrogen content in the molten steel during vacuum treatment is related to factors such as operating process,

steel grade, state of various raw materials added to the furnace, and argon stirring state, in order to ensure that the hydrogen content in the molten steel is ≤ 1.5 ppm and improve the dehydrogenation rate, the working vacuum degree of the vacuum system is determined to be below 67Pa, fully ensuring the requirements of the dehydrogenation process.

2. Denitrification

The relationship between the saturation concentration of hydrogen and nitrogen in molten steel and the partial pressure of hydrogen and nitrogen above the melt.However, the nitrogen content in molten steel is closely related to the content of alloy elements in the steel, making it difficult to remove nitrogen. Therefore, try to reduce the nitrogen content in the steel before VD treatment and extend the VD treatment time.

3. Desulfurization

The content of sulfur in steel is also related to oxygen and often maintains a constant proportion, so the deoxidation process of vacuum treatment is also a desulfurization process. In order to obtain steel grades with extremely low

sulfur content, some elements with strong affinity for sulfur were used as desulfurizers for desulfurization.

4. Argon stirring 

Argon gas is blown into the ladle through the argon blowing port of the breathable brick at the bottom of the ladle to stir the molten steel, causing it to circulate within the ladle. Its function is to create more favorable conditions for the physical and chemical reactions of the molten steel inside the ladle.In order to ensure the effective and smooth

operation of the entire refining argon stirring process, each vacuum tank in this design adopts an independent argon flow rate adjustment system, and the argon flow rate is controlled by a dedicated mass flow control module, thereby achieving precise automatic adjustment of argon gas volume.

 About Us

 With more than 20 years of rich experience,  manufacturer in the field of metallurgical machinery equipment, from design, manufacturing to marketing. We have hundreds of successful cases in designing and producing the whole set of equipment, such as Electric Arc Furnace (EAF), Ladle Refining Furnace (LF), Submerged Arc Furnace (SAF), Argon Oxygen Decarburizing Furnace (AOD), Basic Oxygen Furnace (BOF), VD/VOD Furnace, White Fused Alumina Furnace, Brown Fused Alumina Furnace and CCM Hot Rolling Mill etc.

Exhibition pictures