ASTM A709 specification covers carbon and high-strength low- alloy steel structural shapes, plates, and bars and quenched and tempered alloy steel for structural plates intended for use in bridges. Seven grades are available in four yield strength levels
as follows:
Grade U.S. [SI] Yield Strength, ksi [MPa]
36 [250] 36 [250]
50 [345] 50 [345]
50S [345S] 50 [345]
50W [345W] 50 [345]
HPS 50W [HPS 345W] 50 [345]
HPS 70W [HPS 485W] 70 [485]
HPS 100W [HPS 690W] 100 [690]
This ASTM A709 specification covers carbon and high-strength low alloy steel structural shapes, plates and bars, and quenched and tempered alloy steel for structural plates intended for use in bridges. Heat analysis shall be used to determine the percentage of carbon, manganese, phosphorus, sulfur, silicon, and copper for the required chemical composition. A tension test shall be used to determine the required tensile properties such as tensile strength, yield strength, and elongation. Materials shall undergo: (1) an impact test for non-fracture critical and fracture critical members; and (2) a Brinell hardness test for Grades 100 and 100W. Atmospheric corrosion resistance shall also be determined.
For Grade 50S [345S], the steel shall be killed and such shall be affirmed in the test report by a statement of killed steel,a value of 0.10 % or more for the silicon content, or a value of 0.015 % or more for the total aluminum content.
For Grade 50S [345S], the maximum permissible car-bon equivalent value shall be 0.47 % for structural shapes with flange thickness over 2 in. [50 mm], and 0.45 % for other structural shapes. The carbon equivalent shall be based on heat analysis. The required chemical analysis as well as the carbon equivalent shall be reported.
ASTM A709 Grade 50S Chemical composition:
|
C
|
Si |
Mn |
P |
S |
V |
Nb |
Cu |
Ni |
Cr |
Mo |
|
≤0.23 |
≤0.40 |
0.50-1.60 |
≤0.035 |
≤0.045 |
≤0.15 |
≤0.05 |
≤0.60 |
≤0.45 |
≤0.35 |
≤0.15 |
ASTM A709 Grade 50S Mechanical properties:
|
Yield Strength Mpa |
Tensile Strength Mpa |
Elongation in 2 in. % |
|
345-450 |
≧450 |
≧21 |
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