... ,black or machined surface,Specification:customer requested size) O1/9CrWMn cold work mould steelO1/DIN1.2510 Features:1)Chemical composition:C ... ,Si=0.20~0.40,Mn=1.00~1.30,Cr=0.40~0.60,W=0.40~0.60,V ... small granule6)Application:Used for Mini surface and shape complexed cold die.Material character:have determinate wearable,mini transmutate quenching.equal ...