Type 420 martensitic stainless steel covers a wide carbon range of 0.15% to 0.45%. Demand for this material from the 3C, automotive, biomedical and aerospace industries has been increasing thanks to its combination of moderate corrosion resistance, high hardness, and good tensile properties. In this study, Shu-Hsu Hsieh, Dr Chung-Huei Chueh, and I-Shiuan Chen, from Chenming Electronic Technology Corp. (UNEEC), Taiwan, investigated Nb-alloyed 420 produced using BASF SE’s Catamold 420 W feedstock. Decarburisation was examined in samples processed in both a graphite furnace and a molybdenum lined furnace. Microstructure, phase and hardness variations from the sintered state to each specific stage in heat treatment were also explored. Additionally, the influence of niobium on the formation of intergranular compounds, carbides, and carbonitrides was also assessed in each heat treatment stage for comparison.
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