Avaliação comportamental do inoxidável ferrítico 410D submetido a ensaios de tração a quente e impacto Charpy.

The 410D ferritic stainless steel is a relatively new steel and in development on Brazilian Market. It has been put as a candidate to replace common low carbon steels and weathering steel in some applications, where there are some requirements related to the materials oxidation and corrosion resistance. However, there still is a lack of knowledge related to its mechanical behavior, which allows the assessment of its application’s feasibility in aggressive work conditions, such as in relatively high temperatures, in order to ensure mechanical strength, but also the toughness of the material. Furnace structural parts, piping for conducting hot gases and vapors, among others, are potential examples for 410D steel applications. In this context, the present work has assessed the behavior of the aforementioned steel when it is submitted to hot tensile tests, at 300°C and 600°C, by comparing the obtained results to its performance at room temperature and when it is submitted to Charpy Impact test, in order to construct the absorbed energy – temperature curve. It was concluded that the 410D stainless steel is susceptible to the dynamic aging phenomenon when strained at 300°C. In this condition, its total strain is significantly affected and decreased. At 600°C it was noticed a decrease of 45% on its yield strength and an increase on its total strain when compared to the room temperature condition. It was also concluded that the 410D stainless steel has a ductile - fragile transition between - 65 ° C and 0 ° C, therefore the fracture is completely fragile at temperatures below -65°C and completely ductile above 0°C.