Gas Pressure Measurement Beneath of Oxide Scale during High-temperature Oxidation of Steel

Abstract

Blistering occurs when oxide scale swells during oxidation at steel high temperatures．Blistered scale causes surface defects when steels are rolled. An assumption has been proposed that the pressure of CO and CO₂ gas generation beneath the scale causes blisters. This study the qualitative measurements of the gas pressure beneath the oxide scale were tried．A stainless tube was set in order to connect to the beneath the scale during oxidation．Positive pressures were confirmed beneath oxide scale. Also gas permeability through FeO mono-layer scale was obtained.