Characteristics of low nickel ferritic-austenitic corrosion resistant cast steel

• Main Authors: B. Kalandyk, R. Zapała, S. Sobula, M. Górny, Ł. Boroń
• Format: Article
• Language: English
• Published: Croatian Metallurgical Society 2014-10-01
• Series: Metalurgija
• Subjects: duplex stainless cast steels; microstructure; nitrogen; mechanical properties
• Online Access: http://hrcak.srce.hr/file/180683

The article presents the results of microscopic examinations of corrosion resistant cast steel with reduced nickel content obtained in a test casting with varying wall thickness. Investigations were carried out in as-cast condition and after heat treatment. Regardless of the casting wall thickness, increasing the manganese and nitrogen content to about 5 % and 2 500 ppm, respectively, yields the material with a two-phase microstructure containing ferrite in an amount of 55,6 ÷ 57,2 % (magnetic method) and 52,3 ÷ 55,2 % (analytical method). Based on the results of metallographic examinations, total elimination of the secondary austenite from the microstructure was observed. Microhardness measurements showed average values of 352,3 μHV₂₀ and 267 μHV₂₀ for the chromium ferrite and austenite, respectively.