... /100, 50/105, 51/105, 55/110, 55/120, 58/124, 60/125, 65/120, 65/132, 68/143, 70/135, 70/140, 75 ... - containing tungsten of 15%Surface TreatmentHeat TreatmentHigh Frequency TreatmentNitriding treatment(120 Hours):Depth of Nitrided Layer: 0.5-0.8 mmHardness ... of Nitrided Layer: 900-1020Hv (HRC56°-65°)Hard Chrome Plating treatment:Thickness of Hard Chrome Plating Layer ...