The present invention discloses a process for cracking a hydrocarbon feedstock into olefinic hydrocarbon products in a furnace at a temperature of above about 1300° F. in a reactor furnace tube comprising a plurality of {HEAD ~ reaction lines} constructed of {TAIL ~ a temperature resistant, non nickel containing material} 
constructed of
The present invention discloses a process for cracking a hydrocarbon feedstock into olefinic hydrocarbon products in a furnace at a temperature of above about 1300 ° F. in a reactor furnace tube comprising a plurality of { HEAD ~ reaction lines } constructed of { TAIL ~ a temperature resistant , non nickel containing material }
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