ASTM A193 B16 ALLOY STEEL ROUND BAR

A193 B16 Alloy Steel Round Bar

The ASME A193 designation covers fasteners intended for use in pressure vessels, valves, flanges, and fittings. The addition of vanadium makes this heat treated chromoly steel (AISI 4140) particularly resilient in high temperature environments. A-193 B16 is considered as the most suitable for bolts used at temperature below 450°C with a minimum effect on its structural strength up to 1,100°F.

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ASTM A193 B16 Chemical Properties and Physical Characteristics

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