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ASTM A193 B7 ALLOY STEEL ROUND BAR

A193 B7 Alloy Steel Round Bar

The ASME A193 designation covers fasteners intended for use in pressure vessels, valves, flanges, and fittings. Heat treated chromium-molybendum (AISI 4140) high-yield bolting steel for high pressure applications. A-193 B7 is considered as the most suitable for bolts used at temperature below 450°C with a minimum effect on its structural strength up to 1,000°F.

High Temperature, High Tension Alloy Bolt Material Chemical & Mechanical Requirements

 

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    ASTM A193 B7 Chemical Properties and Physical Characteristics

    C

    Mn

    P

    S

    Si

    Cr

    Mo

    0.37-0.49

    0.65-1.10

    0.035 Max

    0.04 Max

    0.15-0.35

    0.75-1.20

    0.15-0.25

    Dia

    Minimum
    Tempering Temperature
    ( ° F )

    Tensile
    Strength
    min, ksi
    ( MPa)

    Yield
    Strength. min,
    0.2% offset, Ksi
    ( MPa)

    Elongation in
    4D
    min %

    Reduction of
    Area
    min %

    Hardness
    max

    21/2" and under

    1,100
    (593 ° C )

    125(860)

    105(720)

    16

    50

    321HB
    or 35 HRc

    over 21/2" to 4"

    1,100
    (593 ° C )

    115(795)

    95(655)

    16

    50

    302HB
    or 35 HRc

    over 4" to 7"

    1,100
    (593 ° C )

    100(690)

    75(515)

    18

    50

    277HB
    or 29 HRc