Hot Rolled Flat Bars
Conforms to: ASTM A36.
Related Specifications: ASTM A6
Chemistry:
|
Thickness (mm) |
To 3/4 |
Over ¾ to 1/1/2 |
Over 1/1/2 to 4 |
|
||
|
(20) |
(20 to 40) |
(100) |
(100) |
|||
|
Carbon |
0.26 |
0.27 |
0.28 |
0.29 |
||
|
Manganese |
NA |
0.60-0.90 |
0.60-0.90 |
0.60-0.90 |
||
|
Phosphorus |
0.04 |
0.04 |
0.04 |
0.04 |
||
|
Sulfur |
0.05 |
0.05 |
0.05 |
0.05 |
||
|
Silicon |
0.40 |
0.40 |
0.40 |
0.40 |
||
|
Copper |
0.20 |
0.20 |
0.20 |
0.20 |
Mechanical Properties:
Tensile Strength (ksi) 58-80
Yield Point (ksi)
36 min.
Elongation in 8 in.
20% min.
Elongation in 2 in. 21% min.
Width: (per ASTM A6)
|
Specified
Width |
Variations
from Width, in. |
|
|
|
+ |
- |
|
To 1, incl. |
1/64 |
1/64 |
|
Over 1 to 2, incl. |
1/32 |
1/32 |
|
Over 2 to 4, incl. |
1/16 |
1/16 |
|
Over 4 to 6, incl. |
3/32 |
3/32 |
|
Over 6 to 8, incl. |
1/8 * |
1/8 |
* For flats over 6 to 8 in., in
width, and to 3 in. incl. In thickness.
Thickness: (per ASTM A6)
|
Specified Widths,
in. |
Variations from Thickness ( T ) |
||||||
|
0.203 to 0.230 |
0.230 to 1/4 |
¼ to 1/2 |
Over ½ to 1 |
Over 1 to 2 |
Over 2 to 3 |
Over 3 |
|
|
To 1 |
0.007 |
0.007 |
0.008 |
0.010 |
NA |
NA |
NA |
|
Over 1 to 2 |
0.007 |
0.007 |
0.012 |
0.015 |
1/32 |
NA |
NA |
|
Over 2 to 4 |
0.008 |
0.008 |
0.015 |
0.020 |
1/32 |
3/64 |
3/64 |
|
Over 4 to 6 |
0.009 |
0.009 |
0.015 |
0.020 |
1/32 |
3/64 |
3/64 |
|
Over 6 to 8 |
NA |
0.015 |
0.016 |
0.025 |
1/32 |
3/64 |
1/16 |
* Flats over 6 to 8 in. in width are not
available as hot-rolled carbon steel bars in thickness under 0.230 in.
** For flats over 6 to 8 in. in width, and
to 3 in. in thickness
Straightness of Flat Bars
|
Max. Permissible
Variations in Straightness |
|
¼ in any 5 ft. or ¼
times (# of ft. of total length/5) |
·
Permissible variations in straightness do
not apply to hot-rolled bars if any subsequent heating operation has been
performed
4