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ASTM A193 B16 ALLOY STEEL ROUND BAR

B16 Alloy Round Bar – High-Strength Industrial Fasteners

ASME A193 B16 alloy steel is a chromium-molybdenum-vanadium alloy designed for high-strength applications, particularly in extreme temperature environments. It is widely used in power generation turbines and industrial fastener applications, such as high-strength bolting for pressure vessels, valves, flanges, and fittings. B16 alloy rounds are hot worked, solution treated (annealed) and then descaled.

This heat-treated chromoly steel (AISI 4140) is engineered for superior mechanical properties and thermal stability under demanding conditions. The addition of vanadium enhances its high-temperature performance, making ASTM A193 Grade B16 ideal for bolts used below 450°C (842°F) while maintaining structural integrity up to 1,100°F.

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    ASTM A193 B16 Chemical and Physical Properties

    C

    Mn

    P

    S

    Si

    Cr

    Mo

    Al

    V

    0.36-0.47

    0.45-0.70

    0.035 Max

    0.04 Max

    0.15-0.35

    0.80-1.15

    0.50-0.65

    0.015Max

    0.25-0.35

    Dia

    Minimum
    Temperature
    ° F (°C)

    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

    1200(650)

    125(860)

    105(725)

    18

    50

    321HB
    or 35 HRC

    over
    21/2" to 4"

    1200(650)

    110(760)

    95(655)

    17

    45

    302HB
    or 33 HRC

    over 4" to 7"

    1200(650)

    100(690)

    85(586)

    16

    45

    227HB
    or 29 HRC