D_TEXTBLOCK_TEXT Hastelloy consists of 20-23% chromium, 17-20% <HL Topic=Iron.sub>IRON</HL>, 8-10% <HL Topic=Molybdenum.tpc>MOLYBDENUM</HL>, .5-2.5% cobalt, and .2-1% <HL Topic=Tungsten.tpc>TUNGSTEN</HL>. Because its heat resistance is very high, it can be used in gas-turbine parts and other applications requiring heat and oxidation resistance.