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ASTM
A193 B-7 & ASTM A193 B-16
IN
STOCK FOR IMMEDIATE SHIPMENT
High
Temperature High Tension Alloy Bolt Material
Chemical & Mechanical Requirements
ASTM A193 B7
This material is considered as the most suitable for bolts to
be used at temperature below 450 °. C, with a minimum effect on its
structural strength during application at a high temperature.The
material has the following 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 |
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ASTM A193 B16
This material is considered as the most suitable for bolts to
be used at temperature below 450 °. C,even at a high
temperature range, the material has superior physical characterestics
compared to ASTM A193 B7 previously mentioned.
The chemical properties and physical characteristics are as follows |
| 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 |
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