Seven groups of the cast 304 stainless steels with boron addition as 0, 10, 20, 30, 40, 50, and 60 ppm
were used to investigate their corrosion behavior by electrochemical potentiodynamic polarisation capacities
in 10% HNO3 solutions at laboratory environment. The effect of solution heat treatment at 800°C, 900°C and
1000°C for 1h on corrosive resistance of cast 304 stainless steel was also investigated. Microstructures and
corrosion morphologies were examined by optical microscopy, X-ray diffraction analyses and scanning electron microscopy. Because of experiments, improvement of corrosion resistances depending on the amount of
added B and heat treatment conditions were observed. Adding B to the cast 304 stainless steels improved its
resistance to corrosion, but its resistance to intergranular corrosion reduced, which can be seen by the corrosion morphology. The improved corrosion resistance of cast 304 stainless steel was attributed not only to the
added boron, but also solution-annealing treatment compared with non-borided cast 304 stainless steel.