Elevated Temperature Oxidation Resistance of 347 347H 1.4550 Stainless Steel

Alloys 321 and 347 exhibit oxidation resistance comparable to the other 18-8 austenitic stainless steel tube. Specimens prepared from standard mill-finish production material were exposed in ambient laboratory air at elevated temperature. Periodically, specimens were removed from the high temperature environment and weighed to determine the extent of scale formation. Test results are reported as a weight change in units of milligrams per square centimeter and reflect the average from a minimum of two different test specimens.

Alloys 321 and 347 differ primarily by small alloying additions unrelated to factors affecting the oxidation resistance. Therefore, these results should be representative of both grades. However, since the rate of oxidation can be influenced by the exposure environment and factors intrinsic to specific product forms, these results should be interpreted only as a general indication of the oxidation resistance of these grades.

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