D2-HCHC - High Carbon and High Chrome: Our D2 (AISI) knives offer the best value for many moulding producers and planer mills. D2 offers the lowest price per bar because it has a Rockwell C hardness (HRC) of 58. It is easy to grind and resists nicks in knotty soft woods. D2 contains 12% chromium to resist chemical erosion when cutting wet cedar or redwood. Great for softwoods and shorter runs in hardwoods. Knife corrugations are 16 per inch at 60 degree angle.