This book explain in details the potentials of using bitumen-palm kernel oil blend for austempering. The various heat treatment operations were discussed in the book. The various structures formed during austempering of two grades of (0.56% and 0.76%C-) Steel & ductile cast iron were discussed. The phase diagram of the two grades of steel and ductile cast iron were discussed. Austempered steel and cast iron is of great importance to both engineering companies for production of engineering components/parts.