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