Uses and specifications Flashcards
(20 cards)
Commercial ores must contain more than ___% Cr2O3.
45%
Metallurgical Ore
more than or equal to 2.5:1
Refractory Ore
2.5:2
Chromite chemical manufacturers are using chemical grade ores containing __% to __% Cr2O3 and having a chrome to iron ration of ____.
43% to 45%; 1.6:1
Iron (Fe) + Chromium (Cr) (10–30%) + Nickel (Ni) + Carbon (C) + Manganese (Mn)
Stainless Steel
Iron (Fe) + Chromium (Cr) (50–70%)
Ferrochrome (FeCr)
Nickel (Ni) (60–80%) + Chromium (Cr) (20–40%) + Iron (Fe)
Nichrome (Nickel-Chromium Alloy)
Iron (Fe) + Chromium (Cr) + Molybdenum (Mo)
Chrome Molybdenum Steel (Chromoly Steel)
Iron (Fe) + Chromium (Cr) + Tungsten (W) + Vanadium (V) + Carbon (C)
High-Speed Steel (HSS)
Cobalt (Co) + Chromium (Cr) + Tungsten (W) or Molybdenum (Mo)
Stellite (Cobalt-Chromium Alloy)
Nickel (Ni) + Chromium (Cr) + Molybdenum (Mo) + Iron (Fe)
Hastelloy
Nickel (Ni) + Chromium (Cr) + Iron (Fe) + Molybdenum (Mo)
Inconel
Chromium (Cr) + Aluminum (Al)
Chromium-Aluminum Alloys
Chromium when alloyed with tungsten, cobalt and molybdenum produces _____, which is used for high-speed machine tools because of its strength and heat resistance.
satellite
metal treatment processing; glass etching, bright dipping of brass to control the rates of solution of oxygen and zinc in brass and acid cleaning of aluminum and magnesium
Sodium dichromate
timber preservative, for preventing corrosion in air conditioning plants
Acid cupric chromate
used as corrosion inhibitor in fuel tanks of naval aircraft and boilers, cooling towers and automobile engines
Potassium and sodium dichromates
used in protective paints because of its great stability and permanence
Chrome green
gives lemon to orange color
Lead chromate
gives yellow pigment
Zinc chromate
