Influence of austenisation temperature and hold time on grain size of type 9Cr1MoVNb ferritic-martensitic steels used in supercritical boilers
Keywords:9Cr1MoVNb (X10CrMoVNb9.1) Steels, Austenisation (T/t),
The aim of the present work is to determine the influence of austenitizing temperature holding time and heating velocity on grain size of ferritic-martensitic type 9CrlMoVNb steels developed for Oak Ridge National Laboratories & Combustion Engineering, T91/P91 Steels (USA) and X10CrMoVNb 9.1 (Europe). The potential benefits of this material, in term of high resistance, good ductily and oxidation resistance, weldability and in particular good high temperature creep strength, are now widely acknowledged, particulary by supercritical boilers (P = 300 bar, T = 550±50 °C). The studied steels have been produced in, high frecuency induction vacum furnaces and hot-rolled.
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