Features 1.An air hardening tool steel. 2.High abrasion resistance coupled with toughness. 3.The wear resistant are not as great as D2 and D3. 4.When cutting edge is less liable to curmble in service. Shape:steel plate/flat bar/round bar Technology:Hot work / Forged/cold drawn Heat treatment:Annealed / Q+T Surface condition:Black/Peeling/Polishing/Machined Delivery condition:Hot rolled or forged, Peeled or black surface Test:UT 100% / S G S Certification:ISO/mill certificate