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Special Steel Includes Cold Work Steel, Hot Work Steel, Plastic Mould Steel, High Speed Steel, High Strength Steel, Abrasion Resistant Steel. These tool materials adhere to great quality demands of steel like temper, strength, toughness, resistance to tempering, hardening capacity, dimensional stability etc. The range of Tool Steel in our store includes products from renowned manufacturers.
STEELW.NR. 1.2311
Main characteristics and applications
Pre-hardened plastic mould steel with hardening penetration up to 400mm, with good polishing and texturing properties. This steel is suitable for nitriding (around 800 HV), chrome and nickel PVD plating.
Used for plastic moulds with excellent surface finishing properties. It is also used for mould frames, plates, dies box, etc.
Comparable standards
| DIN | W.Nr | AFNOR |
|---|---|---|
| 40CrMnMo7 | 1.2311 | 40CMD8 |
Chemical composition (typical; in weight %)
| C | Si | Mn | P (max) | S (max) | Cr | Mo |
|---|---|---|---|---|---|---|
| 0.35-0.45 | 0.20-0.40 | 1.30-1.60 | 0.03 | 0.03 | 1.80-2.10 | 0.15-0.25 |
Critical points
Ac1 740 °C
Ac3 820 °C
Ms 310 °C
Production technology
EAF – LF – VD - Forging – Heat treatment QT
US specification
In according to standard EN10228-3 Class 4 and standard SEP 1921 Class E/e
Delivery condition
WW.NR. 1.2311 is delivered in quenched and tempered condition, with hardness range 280 - 325 HB (29 - 35 HRC).
Physical properties (reference values)
| 20°C | 100°C | 250°C | 500°C | |
|---|---|---|---|---|
| Thermal expansion coefficient (10-6/K) | 12.1 | 12.4 | 12.9 | 14.1 |
| Thermal conductivity (W/mk) | 36.1 | 36.2 | 36.4 | 33.5 |
| Young modulus (Kn/mm2) | 212 | 205 | 200 | 175 |
Heat treatment
| TREATMENT | TEMPERATURE | HOLDING TIME (HT) | COOLING | COMMENTS | |
|---|---|---|---|---|---|
| Annealing | Heat to 700 - 720 °C | Min. H.T. for 2 minute /mm | Air or furnace | In order to obtain hardness lower than 250 HB ( 24 HRC) to improve machinability | |
| Stress relieving | Heat to 560 - 600 °C (max 30 °C below tempering temperature) | Min. H.T. for 2 minute /mm | Air or furnace | To be carried out after machining, is recommended to eliminate the residual stresses induced by mechanical working | |
| Hardening | Heat to 860-880°C | Min. H.T. for 1 minute /mm | Polymer | - | |
| Tempering | In the range 550 – 600°C | Min. H.T. for 3 minute /mm | Air or furnace | To be carried out after hardening. 2nd Tempering must be performed to max 30°C below tempering temperature | |
C.C.T. curve
Tempering curve
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