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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AOD converter is a pear shaped vessel usually lined with basic refractory lining. Haynes International Case Study Video. This accretion protects the tuyere and surrounding refractory.
Argon-oxygen decarburization | metallurgy |
The AOD converter can be rotated downwards so that the side mounted tuyeres are above the bath level during charging of the liquid steel. The choice of refractory is dependent on decarbhrization vessel operation pattern, final product specifications, and economics. Electro-slag remelting Vacuum arc remelting Argon oxygen decarburization.
Chromium pickup from the brick is possible.
Also, aluminum or silicon may be added to remove oxygen. AOD process refining has three major steps. AOD process uses dilution technique for the decarburization of steel bath.
The stages of blowing remove carbon by the combination of oxygen and carbon forming CO gas.
Another modification of the AOD process involves applying vacuum on the converter to reduce the consumption of argon and silicon as well as the process time when making low carbon grades.
Your email address will not be published. The process is so popular because it combines higher metallic yields with lower material costs.
Retrieved from ” https: These tuyeres typically consist of a copper tube with a stainless oxyge outer tube. It has a removable, conical cover in place. The liquid steel, which contains most of the chromium and nickel needed to meet the final heat composition, is tapped at a temperature of to deg C from the EAF or the IF into a transfer ladle. The molten metal is then decarburized and refined in an AOD converter to less than 0. For more Praxair videos, please visit our YouTube channel.
Praxair can review your system and design an upgrade using:. Nitrogen control is a gas — metal reaction.
Argon Oxygen Decarburization for Metal Production | Praxair, Inc.
Typical internal volumes of AOD converters are in the range 0. A major modification of the AOD process involves the use of top blowing lance in addition to the side blowing tuyeres. Converters are typically zoned by thickness and brick quality to maximize lining life and minimize costs. During decarburization, additions are made for obtaining the proper arrgon chemical composition.
November Learn how and when to remove this template message. In the early days of the AOD process, the converter was tilted for raw material additions as well as for taking samples and for measurement of temperature using immersion thermocouples.
The important feature of an AOD converter is that it is normally side blown. This article needs additional citations for verification. The burning of carbon increases the bath temperature.
Argon oxygen decarburization for metal production
The gas control system supplies the process gases at nominal rates of 1. Low hydrogen Short circuit. An AOD converter is shown in Fig 1. When the vessel is rotated, the tuyeres are above the bath.
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.