Carbon Steel Alloy 8620

  • Carbon Steel Alloy 8620

  • General Characteristics

    AISI 8620 nickel–chrome–moly carburizing steel, generally supplied as rolled to HB 255max. Carburized and heat treated it develops a hard wear resistant case to HRC 60-63 and a tough strong core with a typical tensile strength range of 700-1100 MPa, in small to medium sized sections.

    Typical Applications:

    Arbors, pinions, bushes, camshafts, king pins, ratchets, gears, splined shafts etc. Or can be used for high tensile applications uncarburized but through hardened and tempered.

    Through hardening properties fair with good toughness due to the low carbon and medium alloy content, it is also suitable for Nitriding.

  • Typical Chemical Composition

    Weight % C Mn P S Cr Mo Ni Fe
    minimum 0.18 0.70 — — 0.40 0.15 0.40 96.895
    maximum 0.23 0.90 0.035 0.040 0.60 0.25 0.70 98.02

  • Physical Properties (Annealed condition)

    Characteristics English Metric
    Nominal density

    (68°F/20°C)

    		 0.284 lbs/in3 7.85 g/cm3
    Specific heat Typical Steel 0.114 BTU/lb – °F 475 J/KG- °K
    Thermal conductivity Typical Steel 26.9 Btu / ft-hr-°F 46.6 W/m – °K
    Electrical resistivity Typical Steel 234 nΩ ∙ m

  • Mechanical Properties (Minimum values)

    Condition Tensile Hardness
    Ultimate

    strength

    		 Yield

    strength

    		 Elongation

    in 50 mm

    (2 in.),

    		 Reduction

    in area,

    		 HRB
    1” round specimen KSI MPa KSI MPa % % Min
    Annealed 78 540 55 385 31.3 62.1 149
    Normalized 92.1 635 52.2 360 26.3 59.7 183
    mock carburized, reheated and oil quenched, 230°C temper 124 855 81.2 560 19.5 54.2 248
    mock carburized, reheated and oil quenched, 150°C temper 127 876 84.1 580 20.8 52.7 255
    Quenched from carburizing box 135 931 110 758 16.0 40.0 321
    carburized, box cooled, reheated

    and quenched

    		 139 958 118 814 19.0 48.0 321

  • Specifications

    • ASTM – A513
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