Carbon Steel Alloy 1018

  • Carbon Steel Alloy 1018
  • General Characteristics

    AISI 1018 commercial quality mild steel, bright drawn or smooth turned, with a good balance of strength, ductility and toughness, excellent weldability, also good formability and machinability.

    Typical Applications:

    Axles, bolts, connecting rods, motor shafts, hydraulic shafts, pump shafts, pins, machinery parts etc. Also, light duty gears, camshafts, spindles ratchets etc., when carburized.

  • Typical Chemical Composition

    Weight % C Mn P S Fe
    minimum 0.14 0.60 98.81
    maximum 0.20 0.90 0.040 0.050 99.26
  • Physical Properties (Annealed condition)

    Characteristics English Metric
    Nominal density

    (68°F/20°C)

    0.284 lbs/in3 7.87 g/cm3
    Specific heat 50°C   –  100°C

    122°F  – 212°F

    0.116 BTU/lb – °F 486 J/KG- °K
    150°C –  200°C

    302°F  – 392°F

    0.125 BTU/lb – °F 519 J/KG- °K
    350°C –  400°C

    662°F  – 752°F

    0.143 BTU/lb – °F 599 J/KG- °K
    Coefficient of thermal

    expansion

    68°F – 212°F

    20°C – 100°C

    6.66 micro in/in- °F 12.0 micro m/m- °K
    68°F – 752°F

    20°C – 400°C

    7.5 micro in/in- °F 13.5 micro m/m- °K
    68°F – 1112°F

    20°C – 600°C

    8.00 micro in/in- °F 14.4 micro m/m- °K
    Thermal conductivity 0°C     –    32°F 30.0 Btu / ft-hr-°F 51.9 W/m – °K
    100°C –    212°F 29.4 Btu / ft-hr-°F 50.8 W/m – °K
    200°C –    392°F 28.3 Btu / ft-hr-°F 48.9 W/m – °K
    Electrical resistivity 20°C   /  68°F 152 nΩ ∙ m
    100°C /  212°F 219 nΩ ∙ m
    200°C /  392°F 293 nΩ ∙ m
  • Mechanical Properties (Minimum values)

    Condition Tensile Hardness Average machinabillity
    Ultimate strength Yieldstrength Elongation in 50 mm

    (2 in.),

    Reduction

    in area,

    HRB % of steel 1212 = 100%
    KSI MPa KSI MPa % % Min %
    Hot rolled 58 400 32 220 25 50 116
    Cold drawn 64 440 54 370 15 40 126 70
  • Specifications

    • AMS – 5069D
    • ASTM – A108

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