High temperature behaviour of refractory austenitic stainless steels: σ-phase formation and oxidation in air

Authors

  • J. Botella ACERINOX, S.A. Centro de Investigación y Ensayos. Los Barrios Cádiz
  • J. Almagro ACERINOX, S.A. Centro de Investigación y Ensayos. Los Barrios Cádiz
  • E. Otero Dpto. de Ciencias de los Materiales e Ingeniería Metalúrgica. Fac. de Ciencias Químicas. Univ. Complutense de Madrid
  • P. Hierro Dpto. de Ciencias de los Materiales e Ingeniería Metalúrgica. Fac. de Ciencias Químicas. Univ. Complutense de Madrid
  • C. Merino Dpto. de Ciencias de los Materiales e Ingeniería Metalúrgica. Fac. de Ciencias Químicas. Univ. Complutense de Madrid

DOI:

https://doi.org/10.3989/revmetalm.1998.v34.iExtra.710

Keywords:

Refractory austenitic stainless steels, Oxidation in air, High temperatures, σ-phase

Abstract


Three stainless steels: 25Cr20Ni, 21Cr11Ni(1) and 21Cr11Ni(2) have been oxidised in air at 1,323 K for 2 h. The three materials form oxide layers 1 to 3 μm thick with MnCr2O4 external crystals and Cr2O3 inner ones. There are a SiO2 barrier below Cr2O3, in the oxide-metal interface. SiO2 also forms intra and intergranular precipitates in the metal, which are specially abundant in 21Cr11Ni materials. The theoretical predictions about σ-phase formation tendencies are confirmed after a treatment at 1,073 K for 400 h: 25Cr20Ni forms 10 % vol. σ-phase, while both 21Cr11Ni form few σ-phase or they do not form it at all.

Downloads

Download data is not yet available.

Downloads

Published

1998-05-30

How to Cite

Botella, J., Almagro, J., Otero, E., Hierro, P., & Merino, C. (1998). High temperature behaviour of refractory austenitic stainless steels: σ-phase formation and oxidation in air. Revista De Metalurgia, 34(Extra), 67–70. https://doi.org/10.3989/revmetalm.1998.v34.iExtra.710

Issue

Section

Articles

Most read articles by the same author(s)

1 2 3 > >>