Use of austenitic stainless steel for applications requiring anti-coking properties

摘要

Stainless steel used for the production or coating of equipment and having improved anti-coking properties comprises (in weight %): C at most 0.15, preferably at most 0.1; Mn 2-10, preferably 5-10; Ni at most 2; Cu at most 4; N 0.1-0.4; Cr 10-20, preferably 15-18; Si at most 1; Mo at most 3; and Ti at most 0.7. The steel may also include (in weight %): S at most 0.01, preferably at most 0.003; P at most 0.05, preferably at most 0,045; B at most 0.005, preferably 0.0005-0.005, Nb at most 1.1, V at most 0.40; Al at most 0.05; and Ca at most 0.002. Independent claims are given for: (a) Equipment or part of equipment fabricated from the steel; (b) Equipment or part of equipment coated with the steel; (c) A method of fabricating part of equipment where the part is made up of whole components; (d) A method of coating equipment or part of equipment by co-spinning, plasma coating, physical vapor deposition, chemical vapor deposition, electrolytic deposition, 'overlay', and plating; and (e) Use of the equipment for a petrochemical process at 350-1100 degrees C, especially catalytic reforming at 450-650 degrees C, and dehydrogenation of isobutane to isobutene at 550-700 degrees C.