Carbon Steel Alloy 1045

  • Carbon Steel Alloy 1045

  • General Characteristics

    AISI 1045 is a medium carbon, medium tensile steel, supplied black as rolled, black as forged or normalized and bright drawn or smooth turned, offering good strength, toughness and wear resistance. Will through harden in sections up to 63mm – with a tensile strength of 620 – 850 MPa.

    Typical Applications:

    Axles, bolts, connecting rods, studs, rams, pins, rolls, spindles, ratchets, crankshafts, torsion bars, sockets, worms, light gears, guide rods etc.

  • Typical Chemical Composition

    Weight % C Mn P S Fe
    minimum 0.42 0.60 — — 98.51
    maximum 0.50 0.90 0.040 0.050 98.98

  • Physical Properties (Annealed condition)

    Characteristics English Metric
    Nominal density

    (68°F/20°C)

    		 0.282 lbs/in3 7.80 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

    		 0.140 BTU/lb – °F 586 J/KG- °K
    Coefficient of thermal

    expansion

    		 68°F – 212°F

    20°C – 100°C

    		 6.22 micro in/in- °F 11.2 micro m/m- °K
    68°F – 392°F

    20°C – 200°C

    		 6.61 micro in/in- °F 11.9 micro m/m- °K
    68°F – 572°F

    20°C – 300°C

    		 7.06 micro in/in- °F 12.7 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 – 932°F

    20°C – 500°C

    		 7.84 micro in/in- °F 14.1 micro m/m- °K
    68°F – 1112°F

    20°C – 600°C

    		 8.06 micro in/in- °F 14.5 micro m/m- °K
    Thermal conductivity 100°C 28.8 BTU/ft- hr – °F 49.8 W/m – °K
    Electrical resistivity 20°C   /  68°F 192 nΩ ∙ m
    100°C /  212°F 223 nΩ ∙ m

  • Mechanical Properties (Minimum values)

    Condition Tensile Hardness Average machinabillity
    Ultimate strength Yield

    strength

    		 Elongation

    in 50 mm

    (2 in.),

    		 Reduction

    in area,

    		 HRB % of steel 1212 = 100%
    KSI MPa KSI MPa % % Min %
    Hot rolled 82 570 45 310 16 40 163 —
    Cold drawn 91 630 77 530 12 35 179 55
    As cold drawn 85 590 73 500 12 45 170 65

  • Specifications

    • ASTM – A519
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