Steam-oxidation Property of Shot-blasted Stainless Steel Tubing for 10 Years Service

摘要

The austenitic stainless steel boiler tubing used in the superheaters and reheaters of boilers exhibits scale formation on the inner surface of the tubes as a result of high temperature steam oxidation. This problem has been solved by shot-blasting. In this paper the properties of the shot-blasted tubes are shown, which are used in the boiler of the supercritical steam condition for 10 years. The scale formed on the shot-blasted tubing is between 0.1 #mu# m and 1.3 #mu# m thickness and is extremely thin in comparison with the scale of non-shot-blasted tubing which is presumed over 150 #mu# m thickness in similar condition.