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E: enquiry@qilumetal.com
E: enquiry@qilumetal.com
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1.2661
Qilu
1.2661 (38CrCoWV18-17-17 / SKD8) is a high‑alloy hot‑work tool steel designed for high‑load, high‑wear, and high‑temperature tooling applications. It delivers exceptional hardness, outstanding wear resistance, good hardenability, balanced toughness, excellent dimensional stability, and strong resistance to temper softening after proper heat treatment.
This grade is widely used in precision cold‑working dies, stamping tools, shearing blades, gauges, and wear‑resistant mold inserts. It is a reliable choice for parts requiring long service life and tight dimensional control under heavy pressure and abrasive conditions.
Country | ISO | Germany | Japan |
Standard | ISO 4957 | DIN 17350 | JIS G4404 |
Grade | 38CrCoWV18-17-17 | 1.2661 | SKD8 |
Grade | C | Si | Mn | Cr | Mo | W | P | S | V | Co |
| 38CrCoWV18-17-17/1.2661 | 0.35-0.45 | 0.15-0.50 | 0.20-0.50 | 4.00-4.70 | 0.30-0.50 | 3.80-4.50 | 0.030 Max | 0.020 Max | 1.70-2.10 | 4.00-4.50 |
| SKD8 | 0.35-0.45 | 0.15-0.50 | 0.20-0.50 | 4.00-4.70 | 0.30-0.50 | 3.80-4.50 | 0.030 Max | 0.020 Max | 1.70-2.10 | 4.00-4.50 |
Heat Treatment | Hardness |
Annealed (+A) | HB260Max |
| Hardening and Tempering (+HT) | HRC48 Min |
| Quenched and tempred (+QT) | HRC28-32(Common Range) |
High Hardness & Wear Resistance: High carbon and chromium provide excellent abrasion resistance for long‑run tooling.
Red Hardness & Hot Strength: Tungsten and cobalt enhance high‑temperature strength and stability.
Good Hardenability: Uniform hardness even in large‑section tools.
Dimensional Stability: Minimal distortion during heat treatment and service.
Temper Softening Resistance: Maintains hardness at elevated temperatures.
Balanced Toughness: Reduces chipping and fracture under impact loads.
Product type | Size range | Length |
Hot rolled bar | Φ10-Φ190mm | 2000-5800mm |
Hot forged bar | Φ200-Φ600mm | 2000-5800mm |
Hot rolled plate/sheet | T:10-60mm; W:310-810mm | 2000-5800mm |
Hot forged plate | T:70-250mm; W:310-810mm | 2000-5800mm |
Hot Forged block | T: 260-500mm; W: 300-1000mm | 2000-5800mm |
Surface Finish | Turned | Milled | Grinding(Best) | Polished(Best) | Peeled(Best) | Black Forged | Black Rolled |
Tolerance | +0/+3mm | +0/+3mm | +0/+0.05mm | +0/+0.05mm | +0/+0.1mm | +0/+5mm | +0/+1mm |
Straighness | 1mm/1000mm max. | 3mm/1000mm max. | |||||
Melting Process: EF + LF + VD; EAF + LF + VD; EF + LF + VD + ESR; EAF + LF + VD + ESR
Forging: Start 1050–1100 °C; Finish ≥850 °C; Cool in furnace or sand
Ultrasonic Test: EN 10228‑3 Level III or Sep 1921‑84 D/D
Customized production for consistent quality and performance
Heat to 780–800 °C
Cool at 10–20 °C/h to 650 °C
Furnace or sand cooling
Preheat evenly; Austenitize at 1110–1130 °C (salt bath)
Quench in oil
Temper at 590–610 °C; Air cool
Multiple tempers recommended for stress relief and stability
Above curve in figure is a rough guide to the tempering behaviour of steels.
Precision blanking dies, stamping/punching dies for silicon steel & high‑strength steel, shear blades, cutting dies for wire/bar/plate.
Cold heading, embossing, drawing, and low‑volume cold extrusion dies requiring extreme wear resistance.
Gauges, plug gauges, block gauges, cold rolling rollers, wear inserts in glass‑fiber reinforced plastic molds.
A1: Yes. 1.2661 (DIN) and SKD8 (JIS) are equivalent grades with nearly identical chemical composition and performance. They are interchangeable in most applications.
A2: 1.2661: Higher W, Co, V; better wear resistance, red hardness, and temper stability. Suits cold work & high‑wear hot work.
H13 (1.2344): Better toughness and thermal fatigue resistance. Suits die casting, hot forging, hot extrusion.
A3: It can be used for small, high‑wear die components or inserts, but H13 / SKD61 is more cost‑effective for mainstream die casting due to better toughness and thermal shock resistance.
A4: After proper quenching and tempering, ≥HRC 48; common working hardness HRC 50–54 for cold work tools.
A5: Yes. It is widely used as wear‑resistant inserts in molds processing abrasive plastics with glass fiber or mineral fillers.
A6: Use preheating before austenitizing.
Quench in oil (not water).
Temper promptly after quenching; 2–3 tempers recommended.
Control cooling rate during annealing.
We provide made‑to‑order 1.2661 tool steel to ensure fresh production and tailored performance. Contact us with your size, hardness, and application details for a professional solution.
