COLD ROLLED CLOSED ANNEALED (CRCA) Introducing for the first time in Bangladesh a 100% Hydrogen based Annealing furnace for the manufacture of soft annealed steel. Annealing at Hydrogen atmosphere Bell Type Annealing by Stein Heurtey, France. Skin passing at 4HI Skin Pass Mill of Flat Product equipment, India - the only dedicated standalone skin pass mill for the sole purpose of skin passing CRCA.