VÁŇOVÁ Petra VYSOKÁ ŠKOLA BÁŇSKÁ-TECHNICKÁ UNIVERZITA OSTRAVA

Spoluautoři PĚNČÍK Roman, ČEMPEL David, KONEČNÁ Kateřina

This paper deals with the structure and composition of scale layer of stainless steel AISI 316 and AISI 430 after heat treatment at temperatures of 800, 1000 and 1200 °C with a dwell time at temperature for 1 or 2 hours and after air and water cooling. Subsequently, pickling in reducing melt was carried out. The structure of scale layers after heat treatment and after the following pickling in reducing melt, and its chemical composition using X-ray microanalysis is described, the thickness of scale layer is measured and the mass decrease after pickling in reducing melt is documented. After heat treatment, thicker and more compact oxide layers were formed on the surface of the wire made of AISI 430 stainless steel than on the surface of that made of AISI 316 steel. Oxide layers showed greater thickness after cooling in air than after cooling in water. In the case of stainless steel AISI 316, the oxide layers contained relatively high amount of nickel, which is rather difficult to eliminate by the action of reducing melt. As for AISI 430 steel, the layers are formed on the iron oxide and chromium oxide basis. These layers are more easily distort when exposed to reducing melt and they tend to crack and spall.

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