Use of austenitic stainless steels in applications requiring anti-coking properties

US6824672B2 · kind B2 · utility

Assignees

• INSTITUT FRANCAIS DU PETROLE · FR
• USINOR · FR

Inventors

• Philippe Lecour · Les Mureaux, FR
• Xavier Longaygue · Villepreux, FR
• François Ropital · Paris, FR
• Laurent Antoni · Chambéry, FR

Key dates

• Filing date: Jan 15, 2002
• Grant date: Nov 30, 2004
• Expiry date: Jan 23, 2023

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S585/95
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

An austenitic stainless steel with a composition comprising:at most 0.15% of C;2% to 10% of Mn;at most 2% of Ni;at most 4% of Cu;0.1% to 0.4% of N;10% to 20% of Cr;at most 1% of Si;at most 3% of Mo; andat most 0.7% of Ti;is used to manufacture equipment, for example furnaces, reactors or ducts, or elements of this equipment, or to coat the internal walls of this equipment, said equipment being used to implement petrochemical processes conducted at temperatures of 350° C. to 1100° C. and in which coke can be formed.