AUSTENITIC STAINLESS STEEL ARTICLE HAVING A PASSIVATED SURFACE LAYER

摘要

An austenitic stainless steel article, preferably in the form of a tubing.The article has a passivated surface layer, which in the case of a tubing isonthe interior surface of the tubing. The passivated surface layer has an oxidecomponent having Fe2O3 and Cr2O3 and a metal component of Fe with zerovalence and Cr with zero valence. The ratio of the oxide component to themetal component is in excess of 8:1.