Use of steels with low content of alloying elements for applications involving non-coking properties

摘要

Chromium-silicon-molybdenum steel having a specified composition is used for the manufacture of furnaces, reactors and conduits. The use of a steel, having the composition NOTGREATER 0.25% C, 1.5-5% Si, 4-10% Cr, 0.5-2% Mo, 0.3-1% Mn, NOTGREATER 0.03% S, NOTGREATER 0.03% P and balance Fe, for the manufacture of furnaces, reactors and conduits is new. An Independent claim is also included for a steel which has the composition NOTGREATER 0.25% C, more than 2.5-5% Si, 4-10% Cr, 0.5-2% Mo, 0.3-1% Mn, NOTGREATER 0.03% S, NOTGREATER 0.03% P and balance Fe and which can be used for the above application.