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A1085 Hollow Structural Section HSS
ASTM A1085 - More Efficient Material:
ASTM A1085 provides enhanced performance to make designing with HSS easier and more efficient for structural engineers. Some of the benefits of the new specification include:
Tighter Tolerances – ASTM A1085 cuts the allowable wall tolerance of A500 in half while also adding a mass tolerance. The result is a section that allows specifiers to use the full nominal wall thickness for section properties and connection designs to support more capacity.
Yield Stresses – ASTM A1085 specifies a single minimum yield stress of 50 ksi for all shapes and caps the yield stress at 50 ksi. This makes it an ideal choice for seismic applications which rely on capacity design.
Toughness Requirements – ASTM A1085 requires a standard Charpy V-notch test resulting in 25 ft-lb at 40 degrees F making this material suitable for AASHTO Zone 2 fracture critical elements or other applications where toughness is imperative.
| ASTM A1085: | Cold-Formed Welded Carbon Steel Hollow Structural Sections (HSS) |
| Application: | For use in welded or bolted construction of buildings, bridges, towers, cranes, sigh supports and poles, off-shore production and drilling platforms, roll-over protective structures (ROPS), falling object protective structures (FOPS), and smusement rides. |
| Weld Type: | ERW |
| Shape: | Square, Rectangular, Round |
| Periphery: | ≦88 inch (2235mm) |
| Wall Thickness: | 0.148 inch [3.8mm] ≦ W.T. ≦ 0.875 inch (22mm) |
| Steel Grade: | Grade A, Yield Strength 345-485Mpa [50,000-70,000 psi], Min. Tensile Strength 450Mpa [65,000 psi], Min Elongation in 2 in. [50mm] 21% |
| Wall Thickness Tolerance: | -5%/+10% |
| Mass Tolerance: | -3.5%/+10% |
| External Radius of Corners: | Corner Radius 1.6T to 3.0T for T≦0.4 inch [10.2mm] |
| Corner Radius 1.8T to 3.0T for T>0.4 inch [10.2mm] | |
| Charpy V-Notch (CVN) Impact Test: | 34 J at 4℃ Longitudinally [25ft-lb at 40℉] |
| Flattening Test: | Mandatory for round HSS, not required for square and rectangular HSS. |
| Stress relief or annealing is permissible. If heat treatment is performed mechanical testing shall be conducted after heat treatment. Heat Treatment Temperature at 850℉ [450℃] or higher, followed by cooling in air. |
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