Nitriding develops extreme hardness in the surface of steel. This hardness ranges from 900 to 1,100 Brinell, which is considerably higher than that obtained by ordinary case hardening.
The results show that the hardening depth of steel by composite treatment is much larger than that of single treatment of ion nitriding.
结果证明：复合处理的淬硬层深度大于非氮化激光处理的硬化层。
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Typical materials include ductile iron castings or steel forgings. Most crankshafts require some form of heat treating including case hardening, nitriding and induction harden.