samples are superior to the tempered ones at
carburizing temperatures of 7000C, 8000C and 9000C. On the other hand, the tensile strengths of the tempered samples
are higher relative to the untempered samples at carburizing temperatures of 7000C, 10000C and 11000C. The results of
the carbon analysis show that palm kernel shell and animal bone are potentially suitable to be used as a carburizing
media than the sea shell at high temperatures (above 10000C) with holding time above 1 hr.