Steels, Chrome Manganese

Nitric acid pickling is generally restricted to low-carbon stainless steels of the 200 (nickel-chrome-manganese), 300 (nickel-chrome) and 400 (chrome) series. 

Induction Furnace. The high frequency coreless induction furnace is used in the production of complex, high quaUty alloys such as tool steels. It is used also for remelting scrap from fine steels produced in arc furnaces, for melting chrome—nickel alloys and high manganese scrap, and more recentiy for vacuum steelmaking processes. 

The instrument is of. rather wider utility than is claimed by the manufacturers, even such material as copper drillings being shredded up by it, though in such cases the cups and cones furnished by the makers might profitably be replaced by those of chrome or manganese steel. For certain materials I have also found better results were obtained by running the cone in the opposite direction from that indicated by the manufacturer. 

The cyclone bodies or the wear plates may be fabricated from chromimn carbide overlay plate, hard metals such as heat-treated alloy steel, 11-14% manganese austenitic steel, Ni-hard, high-chrome, ordinary or heat-treated carbon steel, weld hard-facing/overlay, manganese steel and almnimmi, or from various chromium carbide alloys such as those made from molybdemmi, manganese and tungsten. 

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