C | Si | Mn | P | S | Cr | Mo | V |
0.35-0.40 | 1.00-1.20 | 0.40-0.60 | ≤0.015 | ≤0.003 | 4.80-5.20 | 1.20-1.40 | 0.80-1.00 |
Annealing hardness | Quenching hardness | Tempering hardness |
≤230HB | 51-55HRC | 46-50HRC |
Heating temperature | Cooling way | Delivery Hardness (HRC) | Tempering temperature /ºC | Tempering number | Hardness (HRC) | ||
First preheating | Second preheating | Last heating | |||||
500- 600 | 820- 860 | 1010- 1040 | Oil cooling | ≤235HB | 580-640 | 2 | 28-36 |
Steel Grade | Diameter(mm) | Length(mm) | Harness (HRC) |
H13 | 16,18,20,23,25,28,30,33,35,38,40,43,45,48,50,55, 60,65,70,75,80,85,90,95,100,110,120,130,140,150, 160,170,180,190,200, | 3000-6000 | 52-54 |