Apparatus comprising furnaces, reactors or conduits used in applications requiring anti-coking properties and novel steel compositions

US6444168B1 · kind B1 · utility

Assignee

• INSTITUT FRANCAIS DU PETROLE · FR

Inventors

• Philipe Lecour · Les Mureaux, FR
• Xavier Longaygue · Villepreux, FR
• François Ropital · Paris, FR

Key dates

• Filing date: Oct 2, 2000
• Grant date: Sep 3, 2002
• Expiry date: Oct 2, 2020

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C23C30/00
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

In order to produce elements for furnaces, reactors or conduits on the walls of which coke can appear, steels are used with a composition which is adapted to resist coking comprising, by weight, at most 0.25% of C, 1.5% to 5% of Si, 4% to 10% of Cr, 0.5% to 2% of Mo, 0.3% to 1% of Mn, at most 0.030% of S and at most 0.03% of P, the complement to 100% being essentially iron. Novel steel compositions for use in these applications are those which comprise, by weight, at most 0.25% of C, more than 2.5% and up to 5% of Si, 4% to 10% of Cr, 0.5% to 2% of Mo, 0.3% to 1% of Mn, at most 0.03% of S and at most 0.03% of P, the complement to 100% being essentially iron.