1.2311 | P20
Plastic mould steel with good toughness, easy to machine, better polishability than 1.2312, good dimensional stability and photoengraving performance. Supplied at 280–325 HB (pre-hardened, no further heat treatment required). Suitable for tempering, hard chrome plating and pitting.
Available Form
Round Bar
Custom Diameter & Length
Flat Bar
Custom Thickness, Width & Length
Square Bar
Custom Width & Length
Steel Plate
Custom Thickness, Width & Length
Steel Grade Comparison(wt%)
| W-Nr | EN | AISI | JIS |
| 1.2311 | 40CrMnMo7 | P20 | PDS5 |
Chemical Composition
| C | Si | Mn | P | S | Cr | Mo |
| 0.35~0.45 | 0.20~0.40 | 1.30~1.60 | ≤0.035 | ≤0.035 | 1.80~2.10 | 0.15~0.25 |
Physical Properties
Density（g/cm3)：7.85
Modulus of Elasticity（Gpa): 210
Thermal Conductivity（W/（m.k)): 34.0 (100℃), 34.0 (150℃), 33.6 (200℃), 32.9 (250℃), 31.9 (300℃)
| Temperature/。C | 20-100 | 2-200 | 2-300 | 2-400 |
| Coefficient of Thermal Expansion（×10-6） | 11.7 | 13.1 | 13.5 | 14.0 |
Heat Treatment Process
Hardening: Heat the steel evenly to 830~870°C until the whole section reaches temperature. Then quench in oil to cool.
Annealing: Heat the steel to 580~600°C, hold it well at temperature, and then let it cool slowly inside the furnace.
Tempering: Heat the steel uniformly, hold it at the selected tempering temperature, and then allow it to cool in still air.
| Tempering Temperature (℃) | 100 | 200 | 300 | 400 |
| Hardness (HRC) | 51 | 50 | 48 | 46.0 |
Application Fields
Plastic mould, mould frames for plastic mould, large injection mould, pressure casting dies,recipient sleeves.
Disclaimer: the information and data presented herein are typical values for reference and are not intended as warranties to readers.
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