1.1730 - C45U - 19 083
Delivery condition
Delivery condition for sheets and plates:
- +N – normalized
- +S – suitable for cold shearing
- +U – untreated / not heat-treated
Steel number
⚙️ Basic designation
- Material number: 1.1730
- DIN designation: C45U
- EN designation: C45
- AISI / SAE equivalent: 1045
- Standard: DIN EN ISO 683-1
- Steel type: Cold-work tool steel / unalloyed structural steel
Properties and applications
🔩 Properties
| Property | Value / Description |
|---|---|
| Toughness | Good |
| Machinability | Good |
| Heat treatment capability | Yes – hardening, tempering, strengthening |
Mechanical properties:
| Property | Value |
|---|---|
| Tensile strength Rm | 580–700 MPa |
| Yield strength Re | 355 MPa |
| Elongation A5% | 16–20% |
| Hardness HB | approx. 170–210 HB |
🧰 Applications
It is mainly used for the production of mechanically stressed components such as shafts, pins or connecting elements, which can be strengthened by heat treatment. It is suitable wherever a combination of strength, toughness and good machinability is required.
Chemical composition
⚗️ Chemical composition
| Element | Content (%) |
|---|---|
| C | 0.42 – 0.50 |
| Mn | 0.50 – 0.80 |
| Si | 0.10 – 0.40 |
| P | ≤ 0.045 |
| S | ≤ 0.045 |
Heat treatment
🔥 Typical heat treatment
| Process | Temperature (°C) | Medium / Method | Result / Purpose |
|---|---|---|---|
| Soft annealing | 650 – 700 | Slow cooling in furnace (approx. 10 °C/h) | Hardness approx. 160–200 HB, improved machinability |
| Normalizing | 840 – 880 | Cooling in air | Homogenization of structure and mechanical properties |
| Hardening | 820 – 860 | Water or oil | Hardness approx. 50–55 HRC, increased strength |
| Tempering | 540 – 680 | 2 hours, cooling in air | Hardness approx. 160–220 HB depending on temperature |
| Case hardening (optional) | 850 – 880 | Quenching in oil or water | Hard surface (≈58 HRC), tough core |
Delivery condition
Steel number
Properties and applications
Chemical composition
Heat treatment
