Mat.No. 1.2311, DIN 40CrMnMo7, AISI Approx. P20
Designation by Standards Mat. No. DIN EN AISI 1.2311 40CrMnMo7 - Approx. P20 Chemical Composition (in weight %) C Si Mn Cr Mo Ni V W Others 0.40 0.30 1.45 1.95 0.20 - - - - Description Prehardened plastic mould steel with good machinability, better than steel grade Mat. No. 1.2312, suitable for texturing. Applications Plastic moulds, mould frames for plastic moulds, large injection moulds, pressure casting dies,recipient sleeves. Physical pro...
Designation by Standards
Chemical Composition (in weight %)
Prehardened plastic mould steel with good machinability, better than steel grade Mat. No. 1.2312, suitable for texturing.
Plastic moulds, mould frames for plastic moulds, large injection moulds, pressure casting dies,recipient sleeves.
Physical properties (avarage values) at ambient temperature
Modulus of elasticity [103 x N/mm2]: 210
Density [g/cm3]: 7.83
Thermal conductivity [W/m.K]: 34.0 (100oC), 34.0 (150oC), 33.6 (200oC), 32.9 (250oC), 31.9 (300oC), in quenched and tempered condition.
Coefficient of Linear Thermal Expansion 10-6 oC-1
Continuous Cooling Transformation (CCT) Diagram
Heat to 710-740oC, cool slowly in furnace. This will produce a maximum Brinell hardness of 230.
Stress relieving to remove machining stresses should be carried out by heating to approx. 650oC, holding for 1-2 hours at heat, followed by air cooling. This operation is performed to reduce distortion during heat treatment.
Harden from a temperature of 830-880oC followed by oil or air quenching or warm bath quenching 180-220oC. Hardness after quenching is 51 HRC.
Tempering temperature: See the data bellow.
Tempering Temperature (oC) vs. Hardness (HRC)
Hot forming temperature: 1050-850oC.
Machinability is relatively good at about 80% that of the W group water hardening steels
This is a steel alloy and it will corrode or rust unless protected.
This alloy is weldable by conventional methods. Contact the alloy supplier for details and weld procedures.
This steel may be readily cold worked by conventional tooling with the alloy in the annealed condition.
The information and data presented herein are typical or average values and are not a guarantee of maximum or minimum values. Applications specifically suggested for material described herein are made solely for the purpose of illustration to enable the reader to make his own evaluation and are not intended as warranties, either express or implied, of fitness for these or other puposes. There is no representation that the recipient of this literature will receive updated editions as the become available.