Practical Nitriding and Ferritic Nitrocarburizing Hardcover – Import, 4 May 2004

This book is all you need to get a good understanding of nitriding. David Pye is one of the foremost experts on the subject. Most of this information is also covered in "Steel Heat Treatment Handbook" by George E. Totten (http://www.amazon.com/gp/product/082472741X), which also covers many other technologies.