Melting metal in inert gas
The quality of the finished steel increases with a minimum content of gases. Particularly harmful hydrogen contained in water vapor. Quite an effective method of protection is the use of inert gases for purging liquid metal in the furnace or ladle, as well as to create a protective atmosphere over the metal at the time of release from the furnace and filling molds.
In the atmosphere of dry inert gas the partial pressure of hydrogen approaches zero. Therefore, when casting in an inert gas atmosphere, the conditions for the occurrence of the degasification process. At the same time when casting in an inert gas atmosphere to a minimum reduced oxidation processes on the surface of the metal in the mold, which reduces and in some cases eliminates the defects of the surface of the ingot. As the inert gases used are mainly argon and nitrogen. In some cases, the oven is purged with helium.
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