The argon can also be injected into the liquid steel through a porous plug in the ladle bottom. The Composition Adjustment by Sealed Argon Bubbling (CAS) process employs the enlarged chute or immersion tube, which is dipped into the liquid steel through which argon bubbles are emerging and pushing the slag away. The use of argon in treating liquid steel in the ladle has greatly enhanced the flexibility of steel-making operations, significantly improving the surface and internal quality of the steel.CAS Process. Ramachandra Rao, in, 2006 7.2.2.1 Ladle-Without-CoverIn these processes, argon gas is passed through liquid steel in a ladle to mix ferroalloys with the steel, homogenize the steel with respect to chemical composition and temperature, accelerate cooling, and remove oxide and sulfide inclusions. This type of bonding gives metals ductility and a forgiving lattice, resulting in the domains of alloys. In an ionically bonded substance, the lattice is defined by the anions, with cations occupying the “holes.” But for metals and alloys, the cations define the lattice, with a small number of electrons orbiting loosely. Thus, differences between elements and metal alloys are much greater than between end-member minerals and their solid solutions, where the crystal lattice is often little perturbed by cation substitutions.
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