... ,ASTM,DIN,GB 2.Material:25Cr35Ni+MA 3.ISO9001:2008 Heater Radiant Coil1.Standard:ASME,ANSI,ASTM,DIN,GB2.Material:Alloy ZG40Cr25Ni35Nb ... the heater may vary from 30 to 50m.Before the 1960s,cracking tubes were rranged in horizontal rows in a radiant chamber ... cell furnace is well over 150,000 mta.Pyrolysis heater radiant coil characteristics(single heater range)Number of coils 2-176Coil length,m9 ...