SERNA, J.A. and AFANADOR, W. 2001. Estimation of improved productivity based on materials substitution in high temperature applications. use of alloy ASTM A-335 P91. CT&F - Ciencia, Tecnología y Futuro. 2, 2 (Dec. 2001), 125–135. DOI:https://doi.org/10.29047/01225383.555.