Bohler-Uddeholm M2

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  • MATERIALIZING VISIONS

    Bohler-Uddeholm M2HIGH SPEED TOOL STEEL

  • GeneralMolybdenum-type high speed steel with excellent toughness and cutting properties, for a wide variety of uses.This grade has been manufactured to our internal specifications, and audited to meet our guidelines.

    Typicalanalysis %

    C0.85/0.90

    Mn0.25

    Cr4.10

    Mo5.00

    V1.90

    W6.40

    Standardspecification

    ~AISI M2, DIN/EN 1.3343

    Color code Gold/Green

    ApplicationsTaps, twist drills, reamers, broaching tools, metal saws, milling tools of all types, wood working tools, cold work tools.

    Hot FormingFORGING

    1650 2010F (900 1100C), afterwards, slow cooling in furnace or blanketed with thermo-insulating material.

    Heat treatmentANNEALING

    1420 to 1545F (770 to 840C), controlled slow cooling in furnace at 20 to 35F/hr (10 to 20C/hr) to approximately 1110F (600C), followed by cooling in still air. Hardness af-ter annealing 280 Brinell, maximum.

    STRESS RELIEVING

    To relieve stresses created by extensive machining or tooling with complex geometries. Heat in a neutral atmosphere for 1 to 2 hours after reaching a temperature of 1110 to 1200F (600 to 650C), followed by slow cooling in the furnace.

    HARDENING

    Hardening temperature of 1920 to 2245F (1190 to 1230C); quench in: oil, salt bath at 930 to 1020F (500 to 550C), or vacuum. The upper temperature range should be used for parts of simple geometry, the lower range for more complex tooling. For cold work tooling, lower temperatures are of im-portance for improved toughness.

    Preheat in multiple steps and equalize surface and core temperatures; for example: Step 1 - 1020F (550C), Step 2 1560F (850C), and Step 3 1920F (1050C) and then to the appropriate hardening temperature. The third preheat is only required for complex geometries.

    Bohler-Uddeholm M2

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  • HEAT TREATMENT SEQUENCE

    Bohler-Uddeholm M2

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    TemperingSlowly and uniformly heat to the appropriate tempering tem-perature immediately after the hardening operation. Once the temperature of the tool has been equalized, a soaking period of one hour per inch (25 mm) of workpiece thickness is required, but not less than 2 hours. First and second tem-pers should be used to reach the desired hardness level, and the third selected for additional stress relief at 85 - 120F (30 to 50C) below the highest tempering temperature. Intermit-tent cooling, in air, between tempers is required for a mini-mum of 1 hour. Obtainable hardness of 64 to 66 HRC.

    TEMPERING CHART

    Hardening temperature: 2225F (1220C) Specimen size: square cross section 20 mm

    Surface treatmentNITRIDING

    Parts made from this steel may be nitrided via the plasma, gas or salt bath processes

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    Quantitative phase diagram

    B.......Bainite- - - - Oil cooling

    - - Air cooling1 .... Edge or face

    2 .... Core

    A.... AusteniteB.... Bainite

    M.... MartensiteP.... Pearlite

    Lk... Ledeburite carbideRA.. Retained austenite

    Isothermal TTT curves

    Typicalanalysis %

    C0.88

    Mn0.35

    P0.021

    S0.011

    Cr4.12

    Mo4.97

    V1.77

    W6.5

    Austenitizing temperature: 2210F (1210C) Holding time: 150 seconds

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    PropertiesPHYSICAL DATA

    Temperature 68F(20C)

    Densitylbs/in3

    g/cm30.2948.10

    Modulus of elasticitypsiN/mm2

    31.4 x 106

    217 x 103

    Thermal conductivityBtu in/(ft2hF)W/m C

    13219

    Specific heat Btu/lb FJ/kg C

    0.11460

    Electrical Resistivityohm*inohm*mm2/m

    21.30.54

    Thermal expansion between 68F/ 20Cand...

    Temperature 10-6 m/(m*K) 10-6 in/in F

    F C

    212 100 11.5 6.5

    392 200 11.7 6.6

    572 300 12.2 6.9

    752 400 12.4 7.0

    932 500 12.7 7.1

    1112 600 13.0 7.3

    1292 700 12.9 7.3

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    MachiningThe cutting data below are to be considered as guiding values which must be adapted to existing local conditions

    TURNING

    Turning with carbide tipped tools(condition annealed, average values)

    Depth of Cut (ap)inchesmm

    0.02 to 0.040.5 to 1

    0.04 to 0.161 to 4

    0.16 to 0.314 to 8

    over 0.31over 8

    Feed (fz)i.p.r.mm/rev

    0.004 to 0.0120.1 to 0.3

    0.008 to 0.0160.2 to 0.4

    0.012 to 0.0240.3 to 0.6

    0.020 to 0.0600.5 to 1.5

    ISO P10, P20 P10, P20, M10 P30, M20 P30, P40

    Cutting Speed (vc)Indexable Carbide Inserts (edge life 15 min)f.p.m.m/min

    495 to 690150 to 210

    360 to 525110 to 160

    260 to 360 80 to 110

    150 to 23045 to 70

    Cutting Speed (vc)Brazed Carbide Tipped Tools(edge life of 30 min)f.p.m.m/min

    360 to 490110 to 150

    280 to 440 85 to 135

    200 to 29560 to 90

    115 to 23035 to 70

    Hardfaced IndexableCarbide Inserts(edge life 15 min)ISO P20ISO P35

    f.p.m

    to 690 to 460

    m/min

    to 210to 140

    f.p.m.

    to 590to 460

    m/min

    to 180to 140

    f.p.m.

    to 430to 330

    m/min

    to 130to 100

    f.p.m.

    to 260to 200

    m/min

    to 80to 60

    Cutting angles for brazed carbide tipped toolsClearance angleRake angleAngle of inclination

    6 to 86 to 12

    0

    6 to 86 to 12

    -4

    6 to 86 to 12

    -4

    6 to 8 6 to 12

    -4

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    Turning with HSS

    (parameters determined using Bhler S700 /1.3207 DIN)

    Depth of Cut (ap)inchesmm

    0.02 0.5

    0.123

    0.246

    Feed (fz)i.p.r.mm/rev

    0.0040.1

    0.0160.4

    0.0320.8

    Cutting Speed (vc)Indexable Carbide Inserts (edge life 15 min)f.p.m.m/min

    65 to 10020 to 30

    50 to 6515 to 20

    33 to 6010 to 18

    Rake angleClearance angleAngle of inclination

    148-4

    148-4

    148-4

    MILLING

    Milling with Carbide Tipped Cutters

    Feed (fz)inch/tooth

    up to 0.008mm/toothup to 0.2

    inch/tooth0.008 to 0.016

    mm/tooth0.2 to 0.4

    Cutting Speed (vc)ISO P25ISO P40ISO P35

    f.p.m.330 to 490200 to 330280 to 425

    m/min100 to 15060 to 10085 to 130

    f.p.m.200 to 360130 to 230

    --

    m/min60 to 11040 to 70

    --

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    DRILLING

    Drilling with Carbide Tipped Tools

    Drill Diameter 0.12 to 0.31inches

    3 to 8 mm 0.31 to 0.79inches

    8 to 20 mm 0.79 to 1.57 inches

    20 to 40 mm

    Feed (fz) 0.0008 to 0.002 inches

    0.02 to 0.05 mm/rev

    0.002 to 0.005 inches

    0.05 to 0.12 mm/rev

    0.005 to0.007 inches

    0.12 to 0.18 mm/rev

    ISO - grade K10 K10 K10

    Cutting Speed (vc) 115 to 165f.p.m

    35 to 50m/min

    115 to 165f.p.m.

    35 to 50m/min

    115 to 165f.p.m

    35 to 50 m/min

    Top angle 115 to 120 115 to 120 115 to 120

    Clearance Angle 5 5 5

    Electrical-dischargemachiningEDMIf EDM is performed in the hardened and tempered condition, the tool should then be given stress temper at a temperature that is at least 50F (25C) below the lowest tempering temperature.

  • BOHLER-UDDEHOLM CORPORATION2505 Millennium Drive, Elgin, IL 60124www.bucorp.com | 1-800-638-2520 | info@bucorp.comThe Steel Store 1-877-783-3555

    This information is based on our present state of knowledge and is intended to provide general notes on our products and their uses. It should not therefore be construed as a warranty of specific properties of the products described or a warranty for fitness for a particular purpose. The latest revised edition of this brochure is the English version, which is always published on our web site www.bucorp.comEdition 1, 08.2013