ARGON-OXYGEN DECARBURIZATION PDF

Learn more about Praxair’s Argon Oxygen Decarburization process that is used to make over 75% of the world’s stainless steel. Argon Oxygen Decarburization (AOD) Treatment is the recognized standard for stainless steel refining worldwide. Whether you are producing castings, wrought . 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 burning of carbon increases the bath temperature.

For converters that tap into a ladle held by a crane, a sliced cone top section is often used. These are i decarburization, ii reduction, and iii final chemistry and temperature trimming. The end result is a cleaner metal coupled with increased productivity. Argon oxygen decarburization AOD is a process primarily used in stainless steel making and other high grade alloys with decarhurization elements such as chromium and aluminum. Praxair can review your system and design an upgrade using:.

Iron and steel production.

There are two basic choices of refractory type, magnesite-chromite, and dolomite. Other benefits include pinpoint accuracy in chemistry control down to 0. Bottom blown converters have a variety of tuyere configurations depending on flow rates required.

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Argon Oxygen Decarburization Process

Please help improve this article by adding citations to reliable sources. The key feature in the AOD converter is that oxygen for argon-oxygeb is mixed with inert gas such as argon or nitrogen and injected through submerged tuyeres.

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Argon oxygen decarburization for metal production

Magnesite chromite bricks are simultaneously acidic and basic and strict slag compositions must be maintained to prevent rapid wear. It is part of a duplex process in which scrap or virgin raw materials are first melted in an electric arc furnace EAF decarburizatlon induction furnace.

The bath is then stirred with inert gas, typically for around five to eight minutes. This is done in a ladle equipped with stirring facilities with or without the use of a ladle furnace. To drive the reaction to the forming of CO, the partial pressure of CO is lowered decarburixation argon or nitrogen. The effectiveness of reduction step is dependent on many factors including slag basicity and composition, temperature, mixing decarburiaztion in the converter and solid addition dissolution kinetics.

Lime and dolomitic lime are sometimes added before the end of the blow to cool the bath and to reduce the volume of reduction additions.

Argon Oxygen Decarburization Process |

Converters are typically zoned by thickness and brick quality to maximize lining life and minimize costs. Typical internal volumes of AOD converters are in the range 0. There are usually between two and nine tuyeres in an AOD vessel.

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Decarburization time ranges from 20 to 35 minutes in modern converters start from 1. It is part of a duplex process in which scrap or virgin raw materials are first melted in an electric arc furnace EAF or induction furnace IF. From Wikipedia, the free encyclopedia. Low hydrogen Short circuit. Argon oxygen decarburization for metal production Share Print. Designed by Elegant Themes Powered by WordPress.

The converter in the trunnion ring typically can be replaced with a preheated converter in less than an hour. Send a question or comment.

Your email address will not be published. Modern instrumentation has been developed which can take melt samples as well as steel temperatures using a specially designed sub lance with the converter in the upright position. Decarburizztion are usually two to four tuyeres in the bottom.

After a certain carbon level is achieved, the nitrogen gas is replaced by argon.