M2 Tool Steel | 1.3343 | HS-6-5-2C| SKH51

M2 Tool Steel | 1.3343 | HS-6-5-2C| SKH51

Short Description:

AISI M2 Tool Steel is molybdenum based high-speed steel in tungsten–molybdenum series. HSS grade steel M2 is a medium alloyed high speed steel which has good machinability. The H-SS M2 chemical composition gives a good combination of well-balanced toughness, wear resistance and red hardness properties. Widely used for cutting tools such as twist drills, taps, milling cutters, saws, knives etc. Also commonly used in cold work punches and dies and cutting applications involving high speed...


  • Length: 3-5.8mm or Customization
  • Surface: black, peeled, or rough turned
  • Heat treatment: air-cooling, normalized, annealed, Q&T
  • Smelting process: EAF+LF+VD
  • Product Detail

    Product Tags

    AISI M2 Tool Steel is molybdenum based high-speed steel in tungsten–molybdenum series. HSS grade steel M2
    is a medium alloyed high speed steel which has good machinability. The
    H-SS M2 chemical composition gives a good combination of well-balanced
    toughness, wear resistance and red hardness properties. Widely used for
    cutting tools such as twist drills, taps, milling cutters, saws, knives
    etc. Also commonly used in cold work punches and dies and cutting
    applications involving high speed and light cuts.

    Grade M2 High Speed Steel is by far the most popular high speed steel replacing high speed steel grade T1 in most applications because of its superior properties and relative economy.

    1. Common M2 Tool Steel Related Specifications and Equivalents

    Country USA German Japan
    Standard ASTM A600 DIN EN ISO 4957 JIS G4403
    Grades M2 1.3343 SKH51

    2. ASTM M2 Tool Steel Chemical Composition Properties

    ASTM A600 C Mn P S Si Cr V Mo W
    M2 regular C 0.78 0.88 0.15 0.40 0.03 0.03 0.20 0.45 3.75 4.50 1.75 2.20 4.50 5.50 5.50 6.75
    DIN ISO 4957 C Mn P S Si Cr V Mo W
    1.3343 0.86 0.94 0.45 3.80 4.50 1.70 2.10 4.70 5.20 5.90 6.70
    JIS G4403 C Mn P S Si Cr V Mo W
    SKH51 0.80 0.88 0.40 0.03 0.03 0.45 3.80 4.50 1.70 2.10 4.70 5.20 5.90 6.70

    3. AISI HSS M2 Tool Steel Mechanical Properties

    • Physical Properties of HSS M2 Material

    Density         0.294 lb/in3 (8138 kg/m3)
    Specific Gravity                  8.15
    Modulus of Elasticity         0.294 lb/in3 (8138 kg/m3)
    Thermal conductivity         24 Btu/ft/hr/°F  41.5 W/m/°K
    Machinability          65% of a 1% carbon steel
    • AISI M2 Tool Steels Properties Mechanical

    Mechanical properties Metric Imperial
    Hardness, Rockwell C (tempered at 1150°F, quenched at 2200°F) 62 62
    Hardness, Rockwell C (as hardened, quenched at 2200°F) 65 65
    Compressive yield strength (when tempered at 300°F) 3250 MPa 471000 psi
    Izod impact unnotched (when tempered at 300°F) 67 J 49.4 ft-lb
    Abrasion (loss in mm3, as-hardened; ASTM G65) 25.8 25.8
    Abrasion (loss in mm3, tempered at 1275°F; ASTM G65) 77.7 77.7
    Poisson’s ratio 0.27-0.30 0.27-0.30
    Elastic modulus 190-210 GPa 27557-30458 ksi
    • M2 Steels Thermal Properties

    Thermal properties Metric Imperial
    CTE, linear (@20.0 – 100°C/ 68.0 – 212°F) 10 μm/m°C 5.56 μin/in°F
    CTE, linear (@20.0 – 500°C/68.0 – 932°F) 12.2 μm/m°C 6.78 μin/in°F
    CTE, linear (@20.0 – 850°C/68.0 – 1560°F) 12.6 μm/m°C 7 μin/in°F

    4. Forging of AISI M2 High Speed Steel

    Pre
    heat M2 HSS steel slowly and uniformly to 850-900°C. The heat should
    then be increased more quickly to the forging temperature of
    1050-1150°C. If during the forging
    the temperature of the M2 high speed tool steel material drops below
    880-900°C, re-heating will be necessary. Cool the M2 steel component
    very slowly after forging.

    5. Heat Treatment of M2 Steel HSS

    • Anneal

    Heat
    to 1600° F, soak thoroughly at heat. Furnace cool 25° F per hour to
    900° F, air cool to room temperature. Approximate annealed hardness 241
    Maximum Brinell.

    Stress Relief of Unhardened Material: Heat slowly
    to 1200 to 1250° F. Soak for two hours per inch of thickness at heat.
    Slow cool (furnace cool if possible) to room temperature.

    • Hardening

    Preheat: Heat slowly to 1550° F, soak thoroughly, heat to 1850° F, soak thoroughly.

    • Harden

    Soak
    time in the furnace varies from a few minutes to a 15 minutes,
    depending tool size, heat capacity of the furnace, and the size of the
    charge. – Heat to 2150 to 2200° F for max. toughness and minimum
    distortion. – Heat to 2250 to 2275° F for max. hardness and abrasion
    resistance.

    • Quench

    For full
    hardness, oil quench to 150-200° F. Air quench to 150° F. When quenching
    in hot salt maintain the quench just above the Ms temperature. After
    equalizing withdraw parts from the hot salt and air cooled to 150° F.

    • Temper

    Double
    temper is mandatory, three tempers are sometimes preferred. Soak for 2
    hours per inch of thickness. Air cool to room temperature between
    tempers. The best tempering range for hardness, strength and toughness
    is 1000 to 1050° F.

    Temper° F Rockwell “C” Temper° F Rockwell “C”
    As-quenched 64 900 64
    400 63 1000 65.5
    500 62.5 1050 63.5
    600 62.5 1100 61.5
    700 62.5 1150 60
    800 63.5 1200 53

    6. Machinability of AISI M2 Tool Steel H-SS

    Shaping
    of HSS M2 tool steels can be carried out using grinding methods.
    However, they have poor grinding capability and hence they are regarded
    as “medium” machinability tool steel under annealed conditions. The
    machinability of these tool steels M2 is only 50% of that of the easily
    machinable W group or water hardening tool steels.

    7. M2 Tool Steel Applications

    The main use of high-speed steels continues to be in the manufacture of various cutting tools.

    Typical
    applications for M2 high speed steel are twist drills, reamers,
    broaching tools, taps, milling tools, metal saws. M2 is suitable for
    cold forming tools such as extrusion rams and dies, also widely used in
    all kinds of cutting tools, knife and punches and die applications,
    plastic moulds with elevated wear resistance and screws.


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