| designation | Date Published | Yield Strength (Fy ksi) | Yield Strength (Fy MPa) | Tensile Strength(Fu ksi) | Tensile Strength(Fu MPa) |
| A16 | 1924 | 1/2 Fu | 1/2 Fu | 55-65 | 380-450 |
| S39 | 1935 | 30 | 210 | 55-65 | 380-450 |
| S40 | 1935 | 33 | 230 | 60-72 | 410-500 |
| G40.4 | 1950 | 33 | 230 | 60-72 | 410-500 |
| G40.5 | 1950 | 33 | 230 | 60-72 | 410-500 |
| G40.6 | 1950 | 45 | 310 | 80-95 | 550-650 |
| G40.8 | 1960 | 40 | 280 | 65-85 | 450-590 |
| G40.12 | 1964 | 44 | 300 | 65 | 450 |
| G40.21 | 1973 | 50 | 350 | 65 | 450 |
| description | value | unit |
| Density | 7,850 | kg / m3 |
| Unit Weight | 77 | kN / m3 |
| Modulus of elasticity | 200,000 | MPa |
| Shear Modulus | 77,000 | MPa |
| Thermal Coefficient | 11.7 x 10-6 | / oC |
| Poisson Ratio | 0.3 | |
Historical Listing of Selected Structural Steels
Steel Properties
| Fy (MPa) | 260 | 300 | 350 | 380 | 400 | 480 | 550 | 700 |
| W | 260W | 300W | 350W | 380W ** | 400W | 480W | 550W | -- |
| WT | 260WT | 300WT | 350WT | 380WT *** | 400WT | 480WT | 550WT | -- |
| R | -- | -- | 350R | -- | -- | -- | -- | -- |
| A | -- | -- | 350A | -- | 400A | 480A | 550A | -- |
| AT | -- | -- | 350AT | -- | 400AT | 480AT | 550AT | -- |
| Q | -- | -- | -- | -- | -- | -- | -- | 700Q |
| QT | -- | -- | -- | -- | -- | -- | -- | 700QT |
Grade, Types, Strength Levels for Structural Steel
*** This grade is avaible in hollow structural sections only
**This grade is available in hollow structural sections, angles and bars only
G40.20 - General requirements for rolled or welded structural quality steels
G40.21 - Structural Quality Steels
-
W
- Weldable Steel
-
WT
- Weldable Notch Tough Steel
-
R
- Atmospheric corrosion - Resistant Steel
-
A
- Atmospheric corrosion - Resistant Weldable Steel
-
AT
- Atmospheric corrosion - Resistant Weldable Notch Tough Steel
-
Q
- Quenched and Tempered Low Alloy Steel plate
-
QT - Quenched and Tempered Low Alloy Notch Tough Steel plate
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