ARGON OXYGEN DECARBURIZATION PROCESS 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) converter is popularly used in the stainless steel making process. AOD has a top lance for oxygen injection and several.

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Argon oxygen decarburization – Wikiwand

The formation of a high basicity slag and the reduction of oxygen potential in the metal bath are good conditions for sulfur removal. Modern instrumentation has been developed which can take melt samples as dearburization as steel temperatures using a specially designed sub lance with the converter in the upright position. The liquid metal is transferred from transfer ladle to AOD converter.

The tapped bath is then either sent to a stir station for further chemistry trimming or to a caster for casting. The gas control system supplies the process gases at nominal rates of 1. This article needs additional citations for verification. AOD is widely used for the production of stainless steels and specialty alloys such as silicon steels, tool steels, nickel-base alloys and cobalt-base alloys.

This is done in a ladle equipped with stirring facilities with or without the use of a ladle furnace. Process gases are injected through submerged tuyeres that are installed in the side wall or bottom of the converter.

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Argon oxygen decarburization for metal production

There are usually between two and nine tuyeres in an AOD vessel. The system will be tailored to match your current operation with added features found only on the new systems. There are usually two to four tuyeres in the bottom. Send a question or comment. Haynes International Case Study Video. American inventions Stainless steel Steelmaking.

Annealing Low hydrogen Short circuit. After the change from nitrogen to argon, nitrogen is removed from the decarburjzation both by evolved carbon monoxide and argon. The major benefit associated with the dilution process comes into play when the oxygen to inert gas ratio is 1: The decarburization reactions are as follow.

Low hydrogen Short circuit.

These additions also serve to reduce the bath temperature as carbon and chromium oxidations are exothermic. The end result is a cleaner metal coupled with increased productivity.

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oxygrn In the initial stage, oxygen to argon in the ratio ranging from 5: 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, and the third converter is at a reline station. AOD process uses dilution technique for the decarburization of steel bath.

Usually, the converter is turned down to a horizontal position and a sample of the liquid steel is taken for analyses at a carbon level of about 0.

The AOD converter has tuyeres mounted in the sidewall or in the bottom. For converters that tap into a ladle held by a crane, a sliced cone top section is often used. A major modification of the AOD process involves the use of top blowing lance in addition to the side blowing tuyeres. AOD converter decarburization refractories Side blown stainless steel.

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Magnesite chromite refractories have high wear resistance but have a higher unit cost than dolomitic refractories. Unsourced material may be challenged and removed. 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 decarburiaztion the IF into a transfer ladle. The blow is continued to attain 0.

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. Decarburization time ranges from 20 to 35 minutes in modern converters start from 1. The system accurately decafburization the flow rates and monitors the amount of gas injected into the bath to enable the operator to control the process and measure the total oxygen injected.

Qrgon decarburization step is controlled by ratios of oxygen to argon or nitrogen to remove the carbon from the metal bath. Refractory costs are a significant fraction of total operating costs.