Basic Info.
| Model NO. | SKD11 | Composition | Check Detailed Description |
| Technique | Hot Rolled | Shape | Flat |
| Surface Treatment | Black, Machined | Special Use | High-strength Steel Plate, Wear Resistant Steel, Silicon Steel, Cold Heading Steel, Free Cutting Steel, Mold Steel |
| Application | Die Steel Bar | 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 |
| 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 |
| 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 |
| Cr12Mo1V1 | 1.40-1.60 | ≤ 0.60 | ≤ 0.60 | ≤ 0.030 | ≤ 0.030 | 11.00-13.00 | 0.70-1.20 | 0.50-1.10 |
Supply Specifications
| Condition | Processing Route |
Tolerance Range |
Surface Quality |
Application 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 |
Clean surface no heavy scale |
Pre-machined surface ready for further processing |
| Fully Machined |
6 sides precision milled + ground |
+0.05~0.1 mm | Surface roughness Ra1.6 | Ready for direct CNC machining |
| Ground Finish |
6 sides fine ground | +0.02~0.05 mm |
Mirror finish
|
For high-precision molds |
Forging Technique
| Heat Temperature | Start Forging Temperature | Finish Forging Temperature | Cooling Method |
| 1120-1160 °C | 1050-1090 °C | ≥850 °C | Thermal Annealing |
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. 255 HB.
Stress relieving
650 to 700°C
Slow cooling in furnace; intended to relieve stresses set up by extensive machining, or incomplex shapes. After through heating, hold in neutral atmosphere for 1 to 2 hours.
Hardening
1020 to 1040°C
Complex shapes/air, simple shapes/air blast, oil, salt bath from (220 to 250°C or 500 to 550°C).
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 1hour for each 20 mm of work piece thickness, but at least 2 hours/cooling in air. For average hardness figures to be obtained, please refer to the tempering chart. For certain cases we recommend to reduce tempering temperature and increase holding time. For certain applications requiring improved retention of hardness, a nitriding treatmentis recommended.
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