Performance Characteristics: Cold work mould steel, similar to ASTM A2,it is a kind of widely used steel in A. Good wear resistance, minimal distortion, good quench-hardening ability, high pressure strength. Applications: Air hardening tool steel which is easier to machine than D2 or D3 but offers high abrasion resistance with good toughness. steel for pressing mold and cutting knife with heavy-loading and complex shape. Chemical Composition (%): C Si Mn V Ni Cr Cu S P 0.95~1.05 �0.50 �1.00 0.15~0.50 �0.25 4.75~5.50 �0.30 �0.030 �0.030 Mechanical properties: Hardness: annealing,less than or equal to 255 HB，creasing diameter is more than or equal to 3.95 mm ; quenching is more than or equal to 60 HRC. Delivery Condition: Annealed