structural parts of chemical process reactors made of high strength, high temperature resistant and corrosion resistant carbon/carbon composite material, namely, containers, sparger tubes, screens, support plates, baffles, , tubes, shields, diffuser plates, reactor floors,, column liners, tray support grids, , thermowell tube sheaths, sieve trays, spray nozzles, I-beams, T-bars, angle sections, C-channels, flange rings, nuts, bolts, , and pump impellers