DIN 1.2714 HOT WORK TOOL STEEL | 56NICRMOV7 | L6 | SKT4
DIN 1.2714 Steel is defined as Hot work Tool Steel as per DIN 17350 Germany standard( replaced by EN ISO 4957).With Min 1.0%Cr-0.45%Mo-1.5%Ni-0.07%V alloy elements, it have high strength,high hardness and high wear-resistance.
DIN 1.2714 is generally supply in hardened, quenched & tempered condition (Hardness:370-410HBW), and also in annealed condition in special use.Due to its good performace, it is mainly used for forging dies,punches,plastic molds,and die holders etc.
1.DIN 1.2714 steel Supply Form & Size
| Form of Supply | Size(mm) | Length(mm) |
| Round bar | Φ6-Φ1,000 | 3,000-10,000 |
| Square bar | 100x100-600x600 | 3,000-6,000 |
| Plate/Sheet |
Thickness :20-400 Width:80-1,000 |
2,000-6,000 |
| Flat bar/Blcoks |
Thickness :120-800 Width:120-1,500 |
2,000-6,000 |
2.Surface Finish&Tolerance
| Surface Finish | Black-Forged | Black-Rolled | Turned | Grinding | Polished | Peeled | Cold Drawn |
| Tolerance | (0，+5mm) | (0，+1mm) | (0，+3mm) | Best h9 | Best h11 | Best H11 | Best H11 |
3.Chemical Composition
| Grade | C | Si | Mn | P | S | Cr | Ni | Mo | V |
|
1.2714 (56NiCrMoV7) |
0.5-0.6 | 0.1-0.4 | 0.65-0.95 | ≤ 0.03 | ≤ 0.03 | 1.0-1.2 | 1.5-1.8 |
0.45-0.55 |
0.07-0.12 |
4.Related Specifications
ASTM:L6
JIS:SKT4
GB:5CrNiMo
DIN/EN/ISO:55NiCrMoV7
5.Heat Treatment & Mechanical Property
Quenching Details
1.Quench temperature:840-860℃
2.Keep suitable time for the steel to be thoroughly heated.
3.Oil or water quench.
4.Tempering immediately after quenched
DIN 1.2714 Quenching Diagram
Tempering Details
1.Temper temperature:500-600℃
2.Air cooling.
DIN 1.2714 Tempering Diagram
DIN 1.2714 Hardness Vs Tempering temperature
| Tempering Temperature,℃ | 400-480 | 500-550 | 570-650 |
| Hardness,HRC | 42-46 | 38-41 | 32-36 |
DIN 1.2714 Mechanical Property With Quenching and Tempering condition
|
Size mm |
Tensile Mpa |
Yield Mpa |
Elongation % |
Reduction % |
Charpy Impact J |
Surface Hardness HB |
Core Hardness HB |
| Φ180 | 1250 | 1000 | 17 | 58.5 |
L:55/54/42 T:37/36/25 |
377-394 | 387-400 |
| Φ305 | 1280 | 1060 | 16 | 55.5 |
L:42/40/44 T:27/28/30 |
376-400 | 370-386 |
| 300*300 | 1200 | 1000 | 18 | 56.5 |
L:52/52/60 T:42/32/26 |
360-386 | 360-368 |
Annealing Details
1.Annealing temperature:850-870℃
2.Enough soaking time for the steel heating
3.Cooling in the furnace.
4.Max hardness:229HB
DIN 1.2714 Annealing Diagram