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