The present invention discloses a process for cracking a hydrocarbon feedstock into olefinic hydrocarbon products in {HEAD ~ a furnace} at {TAIL ~ 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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The present invention discloses a process for cracking a hydrocarbon feedstock into olefinic hydrocarbon products in { HEAD ~ a furnace } at { TAIL ~ 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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