ASTM A1085 Hollow Structural Steel Tubes Manufacturer and Supplier – Brisk Steel
| Standard | ASTM A1085 / A1085M |
| Process | Cold-formed ERW |
| Out Diameter | up to 88 INCH / 2235 MM |
| Wall Thickness | 3.8 MM - 22 MM |
| Application | Structural use |
What is the ASTM A1085?
This standard covers cold-formed welded carbonsteel hollow structural sections (HSS) for welded or bolted construction.
These shapes are utilized in but not limited to the following applications: buildings, bridges, towers, cranes, signsupports and poles, off-shore production and drilling platforms, roll-over protective structures (ROPS),falling object protective structures (FOPS) , and amusement rides.
Chemical Composition
Heat Analysis
The maximum permissible carbon equivalent shall be 0.45%.
The carbon equivalent shall be calculatedusing the following formula: CE = C + Mn / 6 + (Cr+Mo+V) / 5 + (Ni+Cu) / 15
Product Analysis
If product analyses are made, they shall be made using test specimens taken from two lengths of HSS from each lot of 500 lengths,or fraction thereof, or two pieces of flat-rolledstock from each lot of a corresponding quantity of flat-rolled stock.
| Chemical Composition | ||
| Element | Composition % | |
| Heat Analysis | Product Analysis | |
|
C Max |
0.26 | 0.30 |
| Mn Max | 1.35 | 1.40 |
| P Max | 0.035 | 0.045 |
| S Max | 0.035 | 0.045 |
| Al Min | 0.015 acid soluble or | - |
| 0.020 total Al content | - | |
| Si | ≤0.04 or | ＜0.07 or |
| 0.15 ≤ Si ≤0.25 | 0.13 ≤ Si ≤ 0.28 | |
| NOTE: For each reduction of 0.01 percentage point below the specified maximum for carbon, an increase of 0.06 percentage point above the specified maximum for manganese is permitted,up to a maximum of 1.50% by heat analysis and 1.60% by product analysis. | ||
Mechanical Properties
| Round and Shaped HSS | |
| Grade A | |
| Yield Strength, psi [Mpa] | 50000 [345] - 70000 [485] |
| Tensile Strength, psi [Mpa], Min | 65000 [450] |
| Elongation in 2 in. [50mm], Min. %A | 21 |
| A The minimum elongation values specified apply only to tests performed prior to shipment of the tubing. | |
Charpy V-Notch (CVN) Impact Requirements
The material, as represented by the test specimen,shallconform to the minimum average CVN Impact Value of 25 ft -1b at 40°F [34 J at 4℃],based on full-size longitudinaltest specimens.
Flattening test
The flattening test shall be made on round HSS.Aflattening test is not required for square and rectangular HSS.
Dimensional Tolerance
| Characteristic | Round HSS | Square and rectangular HSS |
|
Outside Dimension |
For ≥ 2 inch[50mm], ±0.75 % with a maximum of 0.005 inch [0.1mm] | ≤ 65mm, with a maximum of 0.02 inch [0.5mm] |
| ＞65≤90mm, with a maximum of 0.025 inch [0.6mm] | ||
|
For ≤1.9 inch [48mm], ±0.5 % with a maximum of 0.005 inch [0.1mm] |
＞90≤140mm, with a maximum of 0.030 inch [0.8mm] | |
| ＞140mm, with 0.01 times large flat dimension | ||
| Wall Thickness | -5% or +10% | |
| Mass |
-3.5% or +10% on individual delivered lengths |
|
| Straightness | 1/8 in.times the number of feet [10 mm times the number of metres] of total length divided by 5. | |
| Squareness of side | - | 90° ± 2° |
| Radius of Corners | - | t ≤ 0.400 [10.2mm], with CornerRadius from 1.6t to 3.0t |
| t ＞ 0.400 [10.2mm], with CornerRadius from 1.8t to 3.0t | ||
Tolerances on Length
| Length Tolerances for Specific Lengths ofStructural HSS | ||||
| / | 22 ft [6.5 m] and under | Over 22 ft [6.5m] | ||
| Over | Under | Over | Under | |
| Length tolerance for specific lengths, in.[mm] |
1/2 [13] |
1/4 [6] |
3/4 [19] |
1/4 [6] |
Tolerances on Twist
| Permissible Variations in Twist for Square andRectangular HSS | ||
| Speciied Outside Large FlatDimension,in.[mm] | Maximum Permissible Variations in Twist per3 ft of Length [Twist per Meter of Length] | |
| in. | [mm] | |
| 1 1/2 [40] and under | 0.050 | [1.3] |
|
Over 1 1/2 to 2 1/2 [40 to 65], incl |
0.062 | [1.6] |
| Over 2 1/2 to 4 [65 to 100], incl | 0.075 | [1.9] |
| Over 4 to 6 [100 to 150], incl | 0.087 | [2.2] |
| Over 6 to 8 [150 to 200], incl | 0.100 | [2.5] |
| Over 8 [200] | 0.112 | [2.8] |
Contact US
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