Mat.No. 1.3243, DIN S6-5-2-5, AISI M35

Mat.No. 1.3243, DIN S6-5-2-5, AISI M35

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Designation by Standards Mat. No. DIN EN AISI 1.3243 S6-5-2-5 HS6-5-2-5 M35 Chemical Composition (in weight %) C Si Mn Cr Mo Ni V W Others 0.91 max. 0.45 max. 0.40 4.15 - 1.90 6.30 - Co: 4.75 Description M35 is molybdenum high speed steel. Very high resistance to wear and to softening at elevated temperatures. High resistance of cutting edge and good toughness. Deep hardening response. High hot hardness.  Applications Highly stressed drills, milling cutters, profile cutting to...


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    Designation by Standards

    Mat. No. DIN EN AISI
    1.3243 S6-5-2-5 HS6-5-2-5 M35

    Chemical Composition (in weight %)

    C Si Mn Cr Mo Ni V W Others
    0.91 max. 0.45 max. 0.40 4.15 - 1.90 6.30 - Co: 4.75

    Description
    M35 is molybdenum high speed steel. Very high resistance to wear and to softening at elevated temperatures. High resistance of cutting edge and good toughness. Deep hardening response. High hot hardness. 

    Applications
    Highly stressed drills, milling cutters, profile cutting tools, thread cutting drills and cold forming tools. 

    Physical properties (avarage values) at ambient temperature
    Modulus of elasticity [103 x N/mm2]: 217 
    Density [g/cm3]: 8.1
    Thermal conductivity [W/m.K]: 19.0 
    Electric resistivity [Ohm mm2/m]: 0.60
    Specific heat capacity[J/g.K]: 0.46

    Coefficient of Linear Thermal Expansion 10-6 oC-1

    20-100oC 20-200oC 20-300oC 20-400oC 20-500oC 20-600oC 20-700oC
    9.7 10.5 11.0 11.4 11.5 12.0 12.5

    Soft Annealing
    Heat to 820-880oC, cool slowly in furnace. This will produce a maximum Brinell hardness of 230-300.

    Stress Relieving
    Stress relieving to remove machining stresses should be carried out by heating to 650oC, holding for one hour at heat, followed by air cooling. This operation is performed to reduce distortion during heat treatment.

    Hardening
    Heat to 450-600oC, preheat to 850oC and then to 1050oC. Harden from a temperature of 1210-1250oC followed by oil, air quenching or warm bath 550oC. Hardness after quenching is 64-66 HRC.

    Transformation temperatures: Ac1=824oC , Ac3=853oC.

    Tempering
    Tempering temperature: 3 x 1 hour at 540-570oC.

    Tempering Temperature (oC) vs. Hardness (HRC)

    200oC 300oC 400oC 500oC 525oC 550oC 575oC 600oC 650oC 700oC
    63 61 62 64 64.5 65 64 63 55 46

    Tempering Diagram


    Click the image to enlarge the diagram.

    Forging
    Hot forming temperature: 1100-900oC. 

    Machinability
    No data.

    Corrosion Resistance 
    Not normally employed in applications requiring corrosion resistance.

    Forms manufactured: Please see the Dimensional Sales Program

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