1.2714 STK4 5CrNiMoV Stainless Black Peeled Turned steel round bar
General Information:
Ni-Cr-Mo steel characterized by high level harden ability and toughness, good resistance to repeated shocks, fairly good insensitivity to thermal shocks and good wear resistance.
Comparable Standards:
| AISI/SAE | DIN | W.Nr. | AFNOR | JIS | BS | SIAU | GB,YB |
| 6F2 | 56NiCrMoV7 | 1.2713 | - | SKD4 | - | - | SCrNiMo |
| 1.2714 |
Chemical Analysis (%):
| C | Mn | Si | Cr | V | Mo | P | S |
| 0.50-0.60 | 0.65-0.95 | 0.10-0.40 | 1.00-1.20 | 0.07-0.12 | 0.45-0.55 | ≤0.03 | ≤0.03 |
Heat treatment
Isothermal annealing:
- Heat to 800°Cand hold at temperature for 1/2 h to 1 h;
- Furnace cooling to 670°Cand hold at temperature for at least 10 hours;
- Cool by 10°C/h to 630°C;
- Cooling in air.
Maximum hardness:≤240 HB
Stress relieving:
To be carried out after maching before the final heat treatment.
- Heat to 600-650°C, hold for 4-6 hours;
- Cooling in furnace to 300-350°C;
- Cooling in air
Hardening:
- Initial preheating to 350-450°C;
- Second preheating to 650-750°C;
- Heat to hardening temperature 860-890°Cand hold at temperature;
- Cooling in hot oil (40-60°C); oil quenched hardness: 54-59HRC;
Tempering:
Tempering must be carried out within one hour from hardening(warm part) in the range 550-630°Cfor 4-6 hours according to hardness required, the dimensions of the parts and operating conditions.
