Reduction in wear of sewage pump through solution nitriding

Influence of the shielding gas composition on the passive film and erosion corrosion of tube-to-tube sheet welds of hyper duplex stainless steel

“…The addition of N 2 in the Ar shielding gas has positive effects as follows; nitrogen is the important element for providing phase balance under weld-cooling conditions due to a strong -stabilizer and increases the transformation temperature of the -phase to -phase, thereby increasing the -phase [22,23]. In addition, it has been reported that the nitrogen addition increases the beneficial effect on the erosion and corrosion resistance of DSSs [24,25]. This is attributed to the effect of nitrogen in lowering the stacking fault energy, leading to an increase in plasticity and work hardening rate.…”

Corrosion–erosion behaviour of austenitic and martensitic high nitrogen stainless steels

“…Not many systematic studies of the effect of increasing nitrogen contents on the erosion resistance and on the corrosion-erosion synergism of stainless steels were reported. Berns and Kühl [8] improved the erosion resistance of a duplex stainless steel used in pumping applications using a HTGN process. In another work, Berns et al studied flow corrosion and corrosion-erosion in three different high nitrogen stainless steels; they found a significant increase in erosion-corrosion resistance of austenitic steel, while changes in the duplex stainless steel behaviour were not noticeable with the addition of nitrogen [9].…”

Increasing the wear resistance of stainless steels

“…By this combination of strength and plasticity the resistance of duplex steels to cavitation may be increased by an order of magnitude. If the nitrogen concentration surpasses the solubility limit, hard nitrides are precipitated on top of the austenitic layer, which counteract erosion by fine hard particles suspended in the fluid [36] (Fig. 14).…”