ASTM A709 is the standard specification for structural steel that is used in bridges. It includes carbon steel plate, HSLA steel plate, and quenched and tempered (Q&T) steel plate, all used as structural steel in the construction of bridges.
ASTM A709 grade 50W steel mechanical properties
|
Tensile Strength |
485 MPa |
65 KSI |
|
Yield Strength |
345 MPa |
50 KSI |
|
Elongation 200mm/8" |
18 |
18 |
|
Elongation 50mm/2" |
21 |
21 |
Its machinability is fair. Since it is an alloy steel, it is tougher to machine than plain carbon steel.
ASTM A709 Applications
A709 grade 50W steel plate is often stocked in the flat-rolled, as-in condition. It is excellent for building bridges and similar applications.
If it is properly designed, it can be used for many applications in the unpainted condition including:
Pedestrian bridges
Railroad bridges and overpasses
Highway bridge girders and additional components
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