Surface treatment of stainless steel

Details Surface treatment of stainless steel Surface treatment of stainless steel

C - Chemistry, Metallurgy

21

D

C21D 1/76 (2006.01) C21D 7/06 (2006.01) C25F 3/24 (2006.01)

Patent

CA 2164021

Stainless steel is used in a number of applications in petrochemical refineries. Some of the components in the stainless steel tend to catalyse the coking of petrochemicals during processing. The present invention is directed to a treatment of stainless steel tube to produce an internal oxide layer which has a low potential to coke feedstocks in contact with the steel at high temperatures. The process involves a treatment at elevated temperatures with a dry reducing atmosphere (e.g. one which is oxygen free or essentially oxygen free) and a subsequent treatment at elevated temperatures with wet hydrogen. The process is particularly useful for treatment of tubes used in an ethylene furnace.

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