special steel O2

1) cold-working die steel with good hardness 2) good comprehensive mechanics performance 3) low-alloy tool steel Standard Chemical composition CSiMnVPSGB/T 1299-2000 % 0.85/ 0.95 ≤0.40 1.70/ 2.00 0.10/ 0.25 ≤ 0.030 ≤ 0.030 Features : 1) good hardenability and small deformation after quenching 2) refining the crystal grain by adding appropriate niobium and reducing superheated susceptivity 3) small carbide comparatively and its well distribution Applications : For making all sorts of gauge, sample board, stamping die, trimming die, steel plate, circularsaw, piercing die annealing ≤500°C , air cooling ≤229HB hot treatment quench 780-820°C oil cooling ≥62HRC backfire 150-200°C air cooling HRC:60-62