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