... 2.Material:25Cr35Ni+MA 3.ISO9001:2008 Heater Radiant Coil1.Standard:ASME,ANSI,ASTM,DIN,GB2. ... .Before the 1960s,cracking tubes were rranged in horizontal rows in a radiant chamber,leading to low ... ethylene capcity(20,000 mta,metric tonnes per annum).Modern designs use tubes ... is well over 150,000 mta.Pyrolysis heater radiant coil characteristics(single heater range)Number of ...