Argon Oxygen Decarburization (AOD) Treatment is the recognized standard for stainless steel refining worldwide. Whether you are producing castings, wrought . Argon-oxygen decarburization: stainless steel: In the argon-oxygen decarburization process, a mixture of oxygen and argon gas is injected into the liquid steel. Argon Oxygen Decarburization, frequently referred to as “AOD”, is an advanced technology for the refinement of iron, nickel, and cobalt based alloys. By.
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The stages of blowing remove carbon by the combination of oxygen and carbon forming CO gas. Bottom injection usually improves wear characteristics in the barrel section of the converter.
Want to modernize and upgrade the functionality of your old AOD system cost-effectively? Nitrogen control is a gas — metal reaction. Special designs exist for normalizing the flow in the annular gap. Bottom blown aegon have a variety of tuyere configurations depending on flow rates required. Dolomitic refractories are usually less costly than magnesite chromite decarbufization and chromium pickup is not a factor.
The molten metal is then decarburized and refined in an AOD converter to less than 0. At any given time, one of the converters is in the tiltable trunnion ring refining steel, a second newly lined converter is at a preheating station, decarburizatuon the third converter is at a reline station.
Posted by Satyendra on Apr 28, in Technical 1 comment. The molten metal is then decarburized and refined in a special AOD vessel to less than 0. The ratios can be done in any number of phases to facilitate the reaction.
The major benefit associated with the dilution process comes into play when the oxygen to inert gas ratio is 1: November Learn decarburzation and when to remove this template message. The decaarburization to increase the productivity has led to continuous charging of raw materials during the blow period as well as reduction period. Your email address will not be published.
Donate Grateful for your donation! Sidewall mounted tuyeres are submerged while processing. The AOD converter can be rotated downwards so that the side mounted tuyeres are above the bath level during charging decarbhrization the liquid steel.
The effectiveness of reduction step is dependent on many factors including slag basicity and composition, temperature, mixing conditions in the converter and solid addition dissolution kinetics. Careful manipulation of slag, as it precipitates in the reaction, is important.
Other benefits include pinpoint accuracy in chemistry control down to 0. Since the blowing is done along with argon it is possible to carry out the decarburization at a lower temperature.
Metal Refining with Argon Oxygen Decarburization (AOD) Refining Systems – Inductotherm Corp.
Retrieved from ” https: Phosphorus, which requires oxidizing conditions, cannot be removed in the converter processing. Would like to more details of how to increase vessel life and to reduce refractory wear near tuyers.
Ideally at this stage of the process, the chemistry of the liquid steel should meet the final specifications so that the heat can be tapped. Unsourced material may be challenged and removed.
Argon oxygen decarburization – Wikipedia
Haynes International Case Study Video. Process gases are injected through submerged tuyeres that decarbruization installed in the side wall or bottom of the converter.
After a desired carbon and temperature level have been reached the process moves to reduction. Iron and steel production.
Other trimming alloy additions might be added at the end of the step. Magnesite chromite refractories have high wear resistance but have a higher unit cost than dolomitic refractories.
Argon Oxygen Decarburization Process
So, additions of lime are added to dilute sulfur in the metal bath. High decagburization areas of the converter, usually the tuyere wall, slag line, and transfer pad are zoned thicker and with higher quality refractory than other parts of the converter. The length of the blow period is determined by the starting carbon and silicon levels of the hot metal charged to the AOD converter.