Carbon Steel Alloy 1070

  • Carbon Steel Alloy 1070

  • General Characteristics

    AISI 1070 is a high-carbon water or oil-hardening tool and spring steel of low hardenability. It is used for railroad and street railway rails, heavy machinery parts, shafts, springs and a wide variety of hand and machine tools requiring strength and wear resistance.

  • Typical Chemical Composition

    Weight % C Mn P S Fe
    minimum 0.65 0.60 — — 98.26
    maximum 0.75 0.90 0.040 0.050 98.75

  • Physical Properties

    Characteristics English Metric
    Nominal density

    (68°F/20°C)

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

    (122-212°F)

    		 0.117 BTU/lb – °F 490 J/KG- °K
    Coefficient of thermal

    expansion

    		 0°C – 100°C

    (-32°F – 212°F)

    		 6.44 µin/in-°F 11.6 µm/m-°C
    0°C – 200°C

    (-32°F – 392°F)

    		 7.00 µin/in-°F 12.6 µm/m-°C
    0°C – 300°C

    (-32°F – 572°F)

    		 7.39 µin/in-°F 13.3 µm/m-°C
    0°C – 400°C

    (-32°F – 752°F)

    		 7.78 µin/in-°F 14.0 µm/m-°C
    Thermal conductivity Typical Steel 30.0 Btu / ft-hr-°F 51.9 W/m – °K
    Electrical resistivity 0°C (32°F) 168 nΩ ∙ m
    100°C (212°F) 230 nΩ ∙ m

  • Mechanical Properties (Minimum values)

    Condition Tensile Hardness
    Ultimate

    strength

    		 Yield

    strength

    		 Elongation

    in 50 mm

    (2 in.),

    		 Reduction

    in area,

    		 HRB
    19-32 mm

    (0.75-1.25 in) round

    		 KSI MPa KSI MPa % % Min
    Hot-rolled 102 703 55.8 385 12 30.0 212
    cold drawn, spheroidized, annealed 92.8 640 71.8 495 10.0 45.0 192
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