High Nitrogen Steels. Effect of Enhancement in Surface Nitrogen Concentration on the Corrosion and Fatigue Properties of Austenitic Steel Wire Rod

Graeme Paul, Hans Chapman-Kpodo, Alan Hendry
1996 ISIJ International  
Austenitic steel rod for wi~e production with a nitrogen content of 0,230/0 has been nittided to produce an enhanced nitrogen surface iayer. The level of nitrogen and depth of penetration is contro]led by the temperature, gas potential and the residence time in the furnace. The cooling rate from the nitriding temperature is also shownto be important in control of the nitrogen distribution. The alloys were then subjected to thermal treatments and the effect of those on the microstructure of the
more » ... ods was assessed. Measurements of the strength. fatigue resistance, corrosion resistance and corrosion fatigue resistance in salt-water were madeand these are interpreted in terms of the nitrogen distribution in the alloys. The consequences of these effects for production and use of wire from such rod is discussed and suggestions are made for a production sequence for improved high-nitrogen ailoy wire.
doi:10.2355/isijinternational.36.867 fatcat:ux2sxm6korhntmytah3qj5lism