The Flash Carbonization™ (FC) process, which was developed in University of Hawaii, can carbonize biomass feed in less than 50 min of reaction time and can produce large quantities of inexpensive biocarbon. Its fixed-carbon yield can reach the thermochemical equilibrium limit. In this process the biomass feed is carbonized mainly by self-sustained combustion with downward air flow. Consequently the process conditions such as air flow rate and air delivery amount have significant effects on the reaction and on the characteristics of product charcoal. Moreover the carbonization reaction can vary depending on biomass species. Banagrass, a variety of elephantgrass (Pennisetum purpureum), has high growing rate and appears to be suitable for tropical areas such as Hawaii, which means that banagrass can be a good feed for the production of biocarbon. However the thin structure of herbaceous species like banagrass could make it difficult to get high fixed-carbon yield. As for utilizations of biocarbon from banagrass, use as a metallurgical reductant is attractive especially in tropical countries like Brazil, where eucalyptus charcoal has been used in metallurgical industry. In this work, banagrasses with different maturities have been carbonized using FC process and the effects of the process conditions and the maturity of banagrass on the yields and the characteristics of charcoal are discussed. Feasibility of utilization of banagrass biocarbon in metallurgy is also discussed.