| Equivalent grades |
GB |
DIN |
AISI |
JIS |
- |
| 5CrNiMoV |
1.2714 |
L6 |
SKT4 |
- |
| Chemical Composition |
C |
Si |
Mn |
Cr |
P |
S |
V |
Ni |
Mo |
- |
| 0.50-0.60 |
0.10-0.40 |
0.65-0.95 |
1.0-1.2 |
≤0.03 |
≤0.03 |
0.07-0.12 |
1.50-1.80 |
0.45-0.55 |
- |
| Available size |
Round Bar |
Diameter |
Length |
| 16-800mm |
2000-6000mm |
| Flat Bar |
Thickness |
Width |
Length |
| 16-400mm |
100-800mm |
2000-6000mm |
| Surface condition |
Black surface/ Grinded/ Machined |
| Annealed hardness |
HB248MAX |
| Characteristics |
high plasticity, good hardenability , .good tenacity and strength, with great wear resistance |
| Applications |
Forging dies,hot shear knives,punches,backing plate,die holders,hot punching tools |
| 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 |
