Basic Info.
| Model NO. | 1.2379 | Composition | Check Detailed Description |
| Technique | Forged | Shape | Block |
| Surface Treatment | Black, Machined | Special Use | High-strength Steel Plate, Wear Resistant Steel, Silicon Steel, Cold Heading Steel, Free Cutting Steel, Mold Steel |
| Application | Check Detailed Description | Delivery Condition | Hot Rolled/Cold-Drawn / Hot Forged |
| Stock | Abundant | Tolerance | +/- 1% |
| Heat treatment | Annealed / Q+T | Transport Package | Nude Packing |
| Specification | check detailed description | Trademark | Ningbo Ningshing |
| Origin | China |
Equivalence
| AISI / SAE | DIN / W.Nr | JIS | GB |
| D2 | 1.2379 | SKD11 | Cr12Mo1V1 |
Chemical Composition(%)
| Steel Grade | C | Si | Mn | P | S | Cr | Mo | V |
| 1.2379 | 1.45-1.60 | 0.10-0.60 | 0.20-0.60 | ≤ 0.030 | ≤ 0.030 | 11.00-13.00 | 0.70-1.00 | 0.70-1.00 |
| D2 | 1.40-1.60 | 0.10-0.60 | 0.20-0.60 | ≤ 0.030 | ≤ 0.030 | 11.00-13.00 | 0.70-1.20 | 0.50-1.10 |
| SKD11 | 1.40-1.60 | ≤ 0.40 | ≤ 0.60 | ≤ 0.030 | ≤ 0.030 | 11.00-13.00 | 0.80-1.20 | 0.20-0.50 |
| Cr12Mo1V1 | 1.45-1.60 | ≤ 0.40 | ≤ 0.60 | ≤ 0.030 | ≤ 0.030 | 11.00-13.00 | 0.80-1.20 | 0.80-1.10 |
| Cr12MoV | 1.45-1.70 | ≤ 0.40 | ≤ 0.40 | ≤ 0.030 | ≤ 0.030 | 11.00-12.50 | 0.40-0.60 | 0.15-0.30 |
| Note: 1.2379 is equivalent to D2. Other grades are for comparison only and may differ in performance | ||||||||
Supply Specifications
| Condition | Processing Description |
Dimensional Tolerance |
Surface Condition |
Notes |
| Black | / | Rolled : +3~5 mm Forged : +10~20 mm |
Hot-rolled black scale surface | Economical choice for large volume orders |
| Rough Machined |
Milled 4 sides + Rough ground 2 sides | Rolled : +0~1 mm Forged : +0~5 mm |
Oxide-free, visible surface | Pre-machined surface ready for further processing |
| Precision Machined | 6 sides precision milled + ground | +0.05~0.1 mm | Surface roughness Ra1.6 | Ready for direct CNC machining |
| High Precision |
6 sides fine ground | +0.02~0.05 mm | Mirror finish | For high-precision molds |
| Custom cutting service available according to drawings | ||||
Forging Technique
| Heat Temperature | Start Forging Temperature | Finish Forging Temperature | Cooling Method |
| 1120 – 1140 °C | 1080 – 1100 °C | 880 – 920 °C | Slow Cooling |
Annealing
800 to 850°C
Slow controlled cooling in furnace at a rate of 10 to 20°C/hr down to approx. 600°C, further cooling in air. Hardness after annealing: max. 250 HB.
Stress relieving
650 to 700°C
Slow cooling in furnace; intended to relieve stresses set up by extensive machining, or in complex shapes. After through heating, hold in neutral atmosphere for 1-2 hours.
Hardening
980 to 1010°C
Oil, salt bath (220 to 250°C or 500 to 550°C), air blast, still air. Tools of intricate shape or with sharp edges should preferably be hardened in air or salt bath. Holding time after temperature equalization: 15 to 30 minutes.
Obtainable hardness: 63 – 65 HRC
Tempering
Slow heating to tempering temperature immediately after hardening/time in furnace 1 hour for each 20 mm of workpiece thickness but at least 2 hours/cooling in air.
For certain cases we recommend to reduce tempering temperature and increase holding time
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