304-L Vac Melt is initially electric-arc melted. Then as a refinement to the purity and homogeneity of the metal, the material is Vacuum Arc Remelted (VAR). This process yields a more uniform chemistry with minimal voids and contaminants. The “L” means low carbon. This material is an austenitic chromium-nickel stainless steel that is annealed (Condition A). These products have been used typically for parts requiring corrosion and heat resistance up to 800 F (427 C), especially when such parts are welded during fabrication, and for parts requiring oxidation resistance up to 1500 F (816 C), but usage is not limited to such applications. This combination of properties is the reason for the extensive use of these alloys, which represent nearly one half of the total U.S. stainless steel production. (UNS: S30400)
