Method of using low alloy anticoking steels with an increased silicon and manganese content in refining and petrochemicals applications
AssigneeInstitute Francais du Petrole
InventorsFrancois Ropital, Xavier Longaygue
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Abstract
The use is described, in the fabrication of apparatus and equipment used in refining and in petrochemicals (for example furnace, reactor or line elements), of a steel composition comprising: at most 0.25% C; more than 1% up to 10% Mn; 1.5% to 5% Si; at most 0.03% P; at most 0.03% S; 4% to 10% Cr; 0.5% to 2% Mo; at most 0.40% V; and at most 0.10% N; the complement to 100% being essentially iron. Steels comprising: at most 0.15% C; more than 2% up to 10% Mn; 1.5% to 5% Si; at most 0.03% P; at most 0.03% S; 4% to 10% Cr; more than 0.5% up to 2% Mo; at most 0.40% V; and at most 0.10% N; the complement to 100% being essentially iron; are themselves novel.
Claims34
In a naphtha catalytic reforming process carried out at temperature of 450° C. to 650° C. or an isobutane dehydrogenation process carried out at temperature of 550° C. to 700° C., the improvement comprising performing said naphtha catalytic reforming process or isobutane dehydrogenation process in a furnace, reactor or tube, entirely or partially fabricated with a steel made from an alloy comprising:
- at most 0.25% C;
- more than 2.0% up to 10% Mn;
- 1.5% to 5% Si;
- at most 0.03% P;
- at most 0.03% S;
- 4% to 10% Cr;
- 0.5% to 2% Mo;
- at most 0.40% V;
- and
- at most 0.10% N;
- the complement to 100% being essentially iron, and with the provision that the alloy has an Mn/Si ratio in the range of 1.5/1 to 3/1,
- wherein said alloy exhibits anticoking properties.
Dependencies are inferred from the claim text.