Steel Round 1.2738 / 40CrMnNiMo8-6-4
General Overview
Steel round 1.2738 (40CrMnNiMo8-6-4) is a high-quality pre-hardened tool steel with excellent machinability, toughness, and wear resistance. It is widely used in mold-making applications, particularly for large plastic injection and compression molds.
Chemical Composition
| Element | Content (%) |
|---|---|
| Carbon (C) | 0.35-0.45 |
| Silicon (Si) | 0.20-0.40 |
| Manganese (Mn) | 1.30-1.60 |
| Chromium (Cr) | 1.80-2.10 |
| Nickel (Ni) | 0.90-1.20 |
| Molybdenum (Mo) | 0.30-0.55 |
| Phosphorus (P) | ≤ 0.025 |
| Sulfur (S) | ≤ 0.035 |
Mechanical Properties
| Parameter | Value |
|---|---|
| Tensile Strength | 1100-1300 MPa |
| Hardness (Pre-Hardened) | 28-33 HRC |
| Impact Toughness | High |
| Thermal Conductivity | Good |
Key Properties
- Pre-hardened condition – no additional heat treatment required.
- Excellent machinability – ideal for precision tooling and mold-making.
- Good toughness and wear resistance – suitable for heavy-duty applications.
- Uniform hardness distribution – ensures reliable performance over time.
Applications
| Industry | Examples of Use |
|---|---|
| Mold-Making | Injection molds, compression molds, die casting tools |
| Mechanical Engineering | High-strength structural components |
| Automotive | Plastic mold tooling, forming dies |
| Tool Manufacturing | Large molds for plastic and rubber processing |
Advantages of Steel 1.2738
✅ Ready-to-use hardness – saves time and costs in production.
✅ High toughness – withstands high mechanical stress.
✅ Good polishing and texturing properties – ideal for surface finishing.
✅ Suitable for large mold applications – provides excellent dimensional stability.
Steel round 1.2738 is an excellent choice for mold-making and tooling applications that require high strength, toughness, and machinability.
Steel Circle Delivery Forms1.2738 / 40CrMnNiMo8-6-4
| Steel circles
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| Mark and steel
| Dimensions supplied (mm)
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| Steel circle 1.2738 / 40CrMnNiMo8-6-4
| 402 – 1202
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