Gutiérrez-Urrutia, L., Gutiérrez, S., & San Juan, J. M. (2001). Influence of austenisation temperature and hold time on grain size of type 9Cr1MoVNb ferritic-martensitic steels used in supercritical boilers. Revista De Metalurgia, 37(2), 98–102. https://doi.org/10.3989/revmetalm.2001.v37.i2.445