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Secondary metallurgy

Process Description

In many cases, steel has not yet reached the desired quality after the refining process. Missing alloying elements, traces of interfering by-elements or dissolved gases in the melt prevent the required properties being achieved. The liquid molten steel is refined by post-treatment called "secondary metallurgy". The content of carbon, hydrogen and nitrogen is further lowered. Through alloying, setting the desired superheating level, and slagging contaminants the properties of the melt are further improved.

The most important methods of secondary metallurgy for the production of quality and stainless steel are the RH (Ruhrstahl Heraeus) process, the DH (Dortmund Hörde) process, the VD (Vacuum Degassing) process, the VOD (Vacuum-Oxygen-Decarburisation) process and the AOD (Argon-Oxygen Decarburization) process.

Advantages:

  • Improvement in steel quality
  • Manufacture of new steels with good performance properties
  • More accurate adjustment of the chemical properties of the steels

Gas Application

Addition of

  • Argon or argon-oxygen via floor purgers

Messer SOlution

In addition to the gases required for your process, Messer offers a variety of equipment for its optimisation under the brand names Oxipyr and Oxijet.

Complete solutions for floor purging are offered in cooperation with our partners.  In order to select the optimum system, experts from Messer first carry out a comprehensive process analysis. Following calculations and basic engineering, suggestions are made for optimisation and further procedures.