Steel 440A


General Information for Stainless Steel 440A

Material Group M - Stainless Steel
Sub-Group Martensitic Stainless Steel
Hardness 42.5 HRC
Tensile Strength 1000-1800 [N/mm^2]
Machinability Range 48%

MACHINABILITY OF 440A STAINLESS STEEL


Stainless Steel 440A is a martensitic (magnetic) stainless steel alloy with 17% chromium, 0.1% carbon and a machinability rating of 48%.

The amounts of carbon (Range 0.1-1.2%) and chromium (10-15%) are the main factors that affect the machinability of martensitic stainless materials.

  • More carbon ==> More strength, but lower machinability and less corrosion resistance
  • More chromium ==> More corrosion resistance, but lower machinabilty
  • Due to its low carbon content stainless steel 440A has high toughness, and therefore it is very malleable. The main challenge to machining it (relative to other martensitic stainless alloys) is breaking the chips. Therefore, it is recommended to select a sharp cutting edge with a tight chip breaker. For this reason, inserts that are designed for arsenic stainless alloys (Such as 304 and 316) will work well also on stainless steel 440A.


    SUMMARY:
  • For general turning of Stainless Steel 440A at stable conditions use a grade with a semi hard substrate and thin CVD coating.
  • In case you are running at a cutting speed that is lower than 390 SFM (120 m/min), it is better to use a grade with a semi hard substrate and PVD coating.
  • For general milling, use the grade with a semi-hard substrate and thin PVD coating.
  • For detailed carbide grades recommendations,check the table below.
  • Recommended cutting speed range for turning at stable conditions is 590 - 790 [SFM] / 180 - 240 [m/min].
  • Recommended cutting speed range for milling with stable clamping and short over hang is 360 - 490 [SFM] / 110 - 150 [m/min]
  • For detailed cutting speed recommendations,  check the table below.

  • Equivalent International Designations for Stainless Steel 440A

    Standard Name
    SAE 440A
    WNR 1.4109
    DIN X70CrMo15
    UNS UNS S44002

    Chemical Composition for Stainless Steel 440A

    Element Amount
    Iron (Fe) 81%
    Chromium (Cr) 17%
    Silicon (Si) 1%
    Manganese (Mn) 1%
    Molybdenum (Mo) 0.75%
    Nickel (Ni) 0.5%
    Phosphorus (P) 0.04%
    Carbon (C) 0.07%
    Sulfur (S) 0.003%

    Cutting Speeds Recomendations for Stainless Steel 440A

    Application Vc (m/min) Vc (SFM)
    Turning 180-240 590-790
    Milling 110-150 360-490
    Parting 70-95 230-310
    Grooving 105-145 340-480
    Drilling 50-70 160-230

    Important! The speed estimation is given for an ideal situation:
    • Most suitable carbide grade
    • Stable tool clamping
    • Stable workpiece clamping
    • Good quality raw material
    • short overhang of the cutting tool.
    • Nominal hardness of the material.
    • etc.


    Grade for Turning

    PRAMET
    Grade Coating Apps Range 05 10 15 20 25 30 35 40 45
    SHARP METAL
    RM15T PVD M15
    RM25T PVD M25
    RM30M CVD TiAlN M30
    RM35T PVD M35
    FM CARBIDE
    FM324 PVD M10 - M20
    FM2553 CVD M30
    CANELA
    NC25 CVD M05 - M15
    TN15 CVD M10 - M25
    TN35 CVD M20 - M40
    TS15 PVD M10 - M20
    TIN20 PVD M10-M30
    TIN25 PVD M25-M35
    ISCAR
    IC807 (IC907) PVD M05- M20
    IC6015 CVD M05-M15
    IC6025 CVD M15-M35
    IC830 (IC328) PVD M20-M45
    Seco
    TM2000 CVD M05-M25
    CP500 PVD M15-M40
    CP600 PVD M20-M45
    TM4000 CVD M25 - M40
    KENNAMETAL
    KCU10 (KC5010) PVD M05 - M20
    KCM15B (KCM15) CVD M10-M20
    KCU25 (KC5025) PVD M15-M30
    KCM25B (KCM25) CVD M15 - M35
    KCM35B (KCM35) CVD M30-M40
    SANDVIK
    GC2015 CVD M05-M15
    GC2220 CVD M10-M25
    GC2025 CVD M15-M35
    GC2035 PVD M20-M45
    TUNGALOY
    T6120 CVD M10-M20
    T6130 CVD M15-M30
    AH630 PVD M15-M30
    AH645 PVD M30-M40
    WALTER
    WSM10S (WSM10) PVD M05-M20
    WSM20S (WSM20) PVD M10 - M30
    WMP20S CVD M10-M30
    WSM30S (WSM30) PVD M25-M40
    MITSUBISHI
    MC7015 CVD M05-M20
    VP15TF PVD M10-M30
    MC7025 CVD M15-M35
    MP7035 PVD M30-M45
    SUMITOMO
    AC6020M (AC610M) CVD M05 - M25
    AC6030M (AC630M) CVD M10 - M35
    AC1030U PVD M20 - M40
    AC6040M PVD M25-M45
    KYOCERA
    PR1025 PVD M15-M25
    PR1225 PVD M15-M35
    PR1425 PVD M15-M35
    PR1125 PVD M25
    PR915 PVD M25
    PR930 PVD M25
    PR1535 PVD M25-P35
    HITACHI TOOL
    IP050S PVD M15
    IP100S PVD M25
    YG-1
    801 PVD TiAlN & PVD M10-M20
    3030 CVD TiCN & PVD M25-M35
    PRAMET
    T6310 PVD M15
    T8315 PVD M15
    T8010 PVD M15
    T8330 PVD M25
    T8030 PVD M25
    T8345 PVD M35
    333TN PVD M35
    KORLOY
    PC8105 PVD M15
    PC8110 PVD M15-M25
    PC8115 PVD M25
    T8345 PVD M35
    PC9030 PVD M35
    PC9070 PVD M35
    PC3030T PVD M35
    PC5300 PVD M35
    ZCC
    YBG101 PVD M15
    YBG102 PVD M15
    YBG202 PVD M15
    YB9320 PVD M25
    YBG205 PVD M25
    YBG202 PVD M25
    YBG302 PVD M35

    Grade for Parting Off

    Grade Coating Apps Range 05 10 15 20 25 30 35 40 45
    FM CARBIDE
    FM2543 CVD M10-M20
    FM2553 CVD M30
    CANELA
    PM25 Uncoated M25
    PM40 Uncoated M40
    SANDVIK
    GC1125 PVD M10-M30
    GC1135 PVD M20-M40
    ISCAR
    IC807 (IC907) PVD M05 - M10
    IC5400 CVD M10-M25
    IC808 (IC908) PVD M10-M30
    IC830 (IC328) PVD M20-M40
    SECO
    CP500 PVD M10 - M40
    CP600 PVD M20-M45
    T350M CVD M20-M40
    KENNAMETAL
    KCU10 PVD M05 - M15
    KCU25 PVD M15 - M30
    WALTER
    WSM13S PVD M05 - M20
    WSM23S PVD M10 - M30
    WSM33S (WSM33) PVD M20-M40
    WSM43S PVD M30-M45
    SUMITOMO
    AC1030U (AC530U) PVD M10-M25
    AC520U PVD M15-M30
    AC830P CVD M20-M40
    TUNGALOY
    AH725 PVD M15-M30
    AH7025 PVD M20-M30
    GH130 PVD M25 - M40
    MITSUBISHI
    VP10RT PVD M05-M10
    VP20RT PVD M10-M30
    VP30RT PVD M20 - M40


    Grade for Grooving

    Grade Coating Apps Range 05 10 15 20 25 30 35 40 45
    FM CARBIDE
    FM2533 CVD M30
    CANELA
    TN35 CVD M20-M40
    TS15 PVD M10-M20
    SANDVIK
    GC1125 PVD M05-M35
    ISCAR
    IC807 (IC907) PVD M05-M15
    IC808 (IC908) PVD M10 - M25
    IC830 (IC328) PVD M20-M40
    KENNAMETAL
    KCU10 PVD M05-M15
    KCU25 PVD M10-M25
    WALTER
    WSM13S PVD M05-M20
    WSM23S PVD M10-M30
    WSM33S (WSM33) PVD M20-M40
    WSM43S PVD M30-M45
    SECO
    CP500 PVD M10-M25
    CP600 PVD M20-M40
    TUNGALOY
    AH725 PVD M15-M30
    AH7025 PVD M20-M30
    AH7025 PVD M20-M30
    GH130 PVD M25-M40
    MITSUBISHI
    VP10RT PVD M05-M15
    VP20RT PVD M10-M25
    VP30RT CVD M20-M40
    SUMITOMO
    AC1030U (AC530U) PVD M10-M25
    AC520U PVD M15-M30
    AC830P CVD M20-M40

    Grade for Milling (Indexable)

    Grade Coating Apps Range 05 10 15 20 25 30 35 40 45
    FM CARBIDE
    FM125 PVD M15-M35
    CANELA
    TIN28 PVD & CVD M05
    ML30 PVD & CVD M05
    SANDVIK
    S30T PVD M05 - M15
    GC1040 PVD M10-M30
    GC2040 CVD M25-M40
    ISCAR
    IC808 (IC908) PVD M05-M15
    IC830(IC328) PVD M10-M30
    IC330(IC328) PVD M15-M40
    KENNAMETAL
    KC522M PVD M10-M25
    KCSM40 PVD M20-M35
    KC725M PVD M30-M40
    WALTER
    WSM35S PVD M25-M45
    WSP45S (WSP45S) PVD M35 - M45
    SECO
    MP2501 CVD M05-M20
    F40M PVD M10-M40
    T350M CVD M20-M40
    TUNGALOY
    AH120 PVD M15-M25
    AH725 PVD M15-M30
    AH3225 PVD M20-M35
    T3225 CVD M20-M35
    AH130 PVD M25-M40
    AH140 PVD M30-M45
    AH3135 PVD M30-M40
    MITSUBISHI
    MP7130 PVD M05-M35
    MP7140 PVD M30-M45
    SUMITOMO
    XCU2500 CVD M05-M20
    ACM100 PVD M05-M15
    ACU2500 PVD M10-M30
    ACM200 CVD M10-M25
    ACM300 PVD M20-M40
    SHARP METAL
    RM20M PVD TiAlN & PVD M15-M25
    RM30M PVD & CVD M30
    RM40M PVD TiAlN & PVD M35-M40
    KYOCERA
    PR2036 PVD M20
    PR11125 PVD M20
    PR830 PVD M30
    PR1225 PVD M30
    PR1525 PVD M30-M40
    PR1535 PVD M30-M40
    HITACHI TOOL
    JP4120 PVD M20
    JS4045 PVD M30
    CY250 PVD M30
    HC844 PVD M30
    PTH30E PVD M40
    PTH40H PVD M40
    JM4160 PVD M40
    YG-1
    602 PVD TiAlN & PVD M20-M35
    PRAMET
    M6330 PVD M20-M30
    8215 PVD M20
    M8340 PVD M30
    M8345 PVD M40
    M8346 PVD M40
    KORLOY
    PC5300 PVD M20
    PC9530 PVD M30
    PC5400 PVD M40
    NCM325 CVD M20
    NC5330 CVD M20
    NMC325 CVD M30
    NCM335 CVD M30
    ZCC
    YBG202 PVD M20
    YBG205 PVD M20
    YBG252 PVD M20
    YB9320 PVD M20
    YBG302 PVD M30
    YBM251 CVD M20
    YBM253 CVD M20
    YBM351 CVD M30


    Recommended Insert Cutting Edge Geometry for Stainless Steel 440A

    Honing Size 0.03-0.05 mm / 0.001-0.002"
    Rake Angle 9°-11°
    Land Angle Positive
    Land Width 0.20-0.30 mm / 0.008-0.012"