DIN 1.2379/X155CrVMo12-1 steel is defined as high carbon and high chromium tool steel as per DIN 17350 standard.
As the representative steel of cold working die steel,DIN 1.2379 steel has high hardness,good wear resistance,dimensional stability,toughness and hardenability after heat treatment.
Din 1.2379 steel is suitable for making cold working dies with high precision, long life and high wear resistance, such as precision stamping dies, cold extrusion forming dies, deep drawing dies, blanking dies, embossing dies and cold forging dies.
DIN 1.2379/X155CrVMo12-1 STEEL SUPPLY FORM & SIZE & TOLERANCE
Hot Forged Round bar:Φ80-Φ1000mm
Hot Rolled Round bar:Φ16-Φ130mm
Hot Forged Square bar: Max Thickness:500mm
Flat bar/Blcoks:Thickness :120-800mm ,Width:120-1500mm
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 |
DIN 1.2379/X155CrVMo12-1 STEEL CHEMICAL COMPOSITION
Grade | C | Si | Mn | P | S | Cr | V | Mo |
1.2379 | 1.5-1.6 | 0.1-0.4 | 0.15-0.45 | ≤ 0.03 | ≤ 0.03 | 11.0-12.0 | 0.9-1.1 | 0.6-0.8 |
DIN 1.2379/X155CrVMo12-1 STEEL RELATED STANDARD & EQUIVALENT GRADE
China:Cr12MoV
USA:D2
Japan:SKD11
DIN 1.2379 STEEL FORGING
- Initial Forging Temperature:1010-1200℃
- Final Forging Temperature:above 927℃
- Forging Ratio:above 4:1
- Cooling Method After Forged:As high carbon cold work tool steel ,DIN 1.2379 steel should be annealed after forging.
DIN 1.2379 STEEL HEAT TREATMENT
Critical Temperature for Heat Treatment of DIN 1.2379 Steel
- Ac1:830℃
- Ac3:855℃
- Ar1:750℃
- Ms:230℃
DIN 1.2379 steel Annealing
The general conventional annealing temperature of DIN 1.2379 steel is 850-870℃,and the holding time is determined by 1h per 25mm wall thickness,then furnace cooled to 500℃ with the rate 22℃/h max.Annealed hardness is usually below 255HBW.
DIN 1.2379 Steel Annealing Diagram
DIN 1.2379 steel Quenching & Tempering
Pre-heat Temperature:840-860℃
Quenching Temperature:1020-1050℃
Quenching Medium:oil,hot bath,air
Tempering Temperature:150-200℃ Followed by Quenching
Hardness: Min 60HRC
DIN 1.2379 Steel Tempering vs Hardness Diagram
Forged cylinder D2 tool steel