1.2311+QT - 40CrMnMo7+QT - 19 520+QT
Delivery condition
Round bars:
+QT – quenched and tempered
+NT – normalized and tempered
Sheets and plates:
+QT – quenched and tempered
+NT – normalized and tempered
Steel number
⚙️ Basic information
Steel number: 1.2311 +QT
DIN designation: 40CrMnMo7 +QT
AISI / SAE equivalent: P20
Type: mould steel, pre-hardened tool steel
Delivery condition: +QT = quenched and tempered
Properties and applications
🔩 Properties
| Property | Description / Value |
|---|---|
| Machinability | Good |
| Polishability | Good |
| Toughness | High |
| Wear resistance | High |
| Hardenability | Very good |
Mechanical properties:
| Property | Value |
|---|---|
| Tensile strength Rm | 1100 – 1250 MPa |
| Yield strength Re | 1000 – 1150 MPa |
| Elongation A5 | 8 – 12 % |
| Hardness after QT | 520 – 600 HB |
🧰 Applications
Mainly used for the production of moulds for plastic mouldings and die-casting moulds. It is also suitable for medium-sized and highly stressed tools and components.
Chemical composition
⚗️ Chemical composition
| Element | Content (%) |
|---|---|
| C | 0.36–0.44 |
| Mn | 0.50–0.80 |
| Cr | 1.30–1.60 |
| Mo | 0.15–0.30 |
| S | ≤ 0.035 |
| P | ≤ 0.035 |
| Si | 0.20–0.40 |
Heat treatment
🔥 Typical heat treatment
| Process | Temperature (°C) | Medium | Result |
|---|---|---|---|
| Soft annealing | 710–740 | Slow cooling in the furnace | Hardness approx. 220 HB |
| Hardening | 840–870 | Oil or air | 50–54 HRC before tempering |
| Tempering | 550–680 | Air | 280–325 HB ≈ 30–35 HRC |
| Nitriding | 500–530 | — | Surface hardness up to 1000 HV |
Delivery condition
Steel number
Properties and applications
Chemical composition
Heat treatment
