Steam oxidation of TP347HFG, super 304H and HR3C – analysis of significance of steam flowrate and specimen surface finish

Abstract

This paper delivers an analysis of the steam oxidation of the austenitic steels used for the super heater and re-heater tubing. It compares the behaviour of TP347HFG, Super 304H and HR3C at 650 and 700°C with three different steam flowrates: 4, 16· 40 mm/s. Steam oxidation tests were performed in closed loop system for 1000 h. The differences in the steam oxidation behaviour of these materials are considered in terms of the alloy compositions (especially chromium content), the steam flowrate and the material surface finish.

Keywords:

• Steam oxidation
• Flowrate
• Surface finish SEM
• EDX
• XRD