Sanicro 28's chemical composition allows it to be used under highly acidic as well as chloride environments. Its high nickel content also makes it known as a nickel alloy. Chromium is a carbide former and 28% chromium in the alloy ensures superior resistance to corrosion. It also has a very high nickel content of 32% which further ensures superior strength even at elevated temperatures. Nickel has an ability to effectively resist corrosion during active state, hence with the help of its high nickel content, the grade can be used in highly acidic environments. Furthermore, the composition gives the alloy great impact strength, which makes it a very conducive alloy to be used in dynamic applications.
An addition of molybdenum of about 3-4% gives the grade a balanced composition. Molybdenum is a ferrite former and to balance the composition, austenitic former like nickel is present in the alloy. The addition of molybdenum ensures resistance to localized as well as uniformly distributed corrosion, which somewhat also improves its mechanical strength. The grade does not contain any element for carbide precipitation stabilization but still has good resistance to intergranular corrosion due to its chemical composition.
It is suitably used at elevated temperatures with adequate resistance to oxidation. However, the grade should normally be restricted to use above 600°C since, in that temperature range, precipitation of intermetallic phases might occur leading to embrittlement. After usage at elevated temperature, annealing is recommended. The grade also has excellent forming characteristics and can be bent by cold as well as hot working. Annealing might be required after hot bending, while cold bending does not require annealing