... ,GB 2.Material:25Cr35Ni+MA 3.ISO9001:2008 Ethylene Plant Steam Cracker Coil Systems1.Standard:ASME,ANSI,ASTM,DIN,GB2.Material ... % vol. Feed is heated and cracked in the presence of steam by tubular furnace,outlet temperature 815-870°C.Special construction ... to 50m.Before the 1960s,cracking tubes were rranged in horizontal rows in a radiant chamber,leading to low ethylene capcity ...