Mat.No. 1.2311, DIN 40CrMnMo7, AISI Approx. P20

Mat.No. 1.2311, DIN 40CrMnMo7, AISI Approx. P20

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  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...


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    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 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

     

    20-100oC 20-200oC 20-300oC 20-400oC 20-500oC 20-600oC 20-700oC
    11.7 13.1 13.5 14.0 14.4 14.6 14.7

     

    Continuous Cooling Transformation (CCT) Diagram

    Soft Annealing
    Heat to 710-740oC, cool slowly in furnace. This will produce a maximum Brinell hardness of 230.

    Stress Relieving
    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.

    Hardening
    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
    Tempering temperature: See the data bellow.

    Tempering Temperature (oC) vs. Hardness (HRC)

     

    100oC 200oC 300oC 400oC 500oC 600oC 700oC
    51 50 48 46 42 36 28

     

    Tempering Diagram

    Forging
    Hot forming temperature: 1050-850oC.

    Machinability
    Machinability is relatively good at about 80% that of the W group water hardening steels

    Corrosion Resistance
    This is a steel alloy and it will corrode or rust unless protected.

    Welding
    This alloy is weldable by conventional methods. Contact the alloy supplier for details and weld procedures.

    Cold working
    This steel may be readily cold worked by conventional tooling with the alloy in the annealed condition.

    Disclaimer
    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.

     

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