Analyze the effect of Molybdenum on Heat Resistance Stainless Steel Casting SCH 22

Abstract

There was SCH 22 component named hanger that is produced by casting, where it is one of the components applied at 1100°C work temperature. Problems on the product is the occurrence of scaling, causing the the function failure and shortening its lifetime. Generally, this scaling occurs when the material is exposed to high temperature, then kinds of iron oxide layers are arisen such as FeO, Fe3O4, and others. Based on the literature, Molybdenum can be added to the SCH 22 with maximum limit of 0.5%. The purpose of this study is to know the influence of Molybdenum to the mechanical properties and analyze the phenomenon of scaling on Heat Resistant Stainless steel Casting (SCH 22). It is expected that molybdenum could increase the scaling resistance in the high temperature. The method is making specimens through metal casting process where the molybdenum content are made to 0.3%, 0.7%, 1.1%. Each specimen should be heated at 1150°C and held for 4 hours. Then the mechanical strength and micro structure are observed to see the effect such molybdenum addition. The result is obtained that the 0.7% addition of molybdenum element can reduce the degradation due to scaling on Heat Resistance Stainless Steel Casting SCH 22.