ASTM A501 Hollow Structural Steel Tubes Manufacturer and Supplier – Brisk Steel
| Standard | ASTM A501/A501M |
| Material | Carbon steel pipe |
| Manufacture | Hot-formed ERW or SAW or FBW or SMLS |
| Grade | Grade A, Grade B, and Grade C |
| Shape | Round, square, rectangular, or special shapes |
| Round tubing Dimensions | Diameters 1 to 48 in. [25 to 1220 mm] and wall thickness of 0.095 to 4.00 in. [2.5 to 100 mm] |
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Square and rectangular tubing Dimensions
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Diameters 1 to 16 in. [25 to 405 mm] and wall thickness 0.095 to 1.0 in. [2.5 to 25 mm].
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| Surface Coating | Hot Dip Galvanized |
What is the ASTM A501?
This specification covers black and hot-dipped galvanized hot-formed welded and seamless carbon steel square, round, rectangular, or special shape structural tubing for welded, riveted, or bolted construction of bridges and buildings, and for general structural purposes.
- The grade of the tubing is Grade A, Grade B, and Grade C.
- The final shape formation shall be made by a hot forming process
- The weld shall not be located within the radius of the corners of any tube having one or more flat sides.
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It shall be permissible to add a normalizing heat treatment for tubing with a wall thickness greater than 1/2 in.[13 mm].
Chemical Composition
| Chemical Requirements A | ||||
| Element | Composition % | |||
| Grade A | Grade B, C | |||
| Heat Analysis | Product Analysis | Heat Analysis | Product Analysis | |
| C, maxB | 0.26 | 0.30 | 0.22 | 0.26 |
| Mn, maxB | ... | ... | 1.40 | 1.45 |
| P, max | 0.035 | 0.045 | 0.030 | 0.040 |
| S, max | 0.035 | 0.045 | 0.020 | 0.030 |
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Cu, min |
0.20 | 0.18 | 0.20 | 0.18 |
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B 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 1.60 % by heat analysis and 1.65 % by product analysis.
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Mechanical Properties
| Tensile and Impact Requirement | |||||
| / | Wall Thickness in [mm] |
Grade A | Grade B | Grade C | |
| Tensile strength, min, psi [MPa] | All | 58,000 [400] | 65,000 [448] | 70,000 [483] | |
| Yield strength, min, psi [MPa] | ≤ 1 [25] | 39,000 [270] | 46,000 [315] | 50,000 [345] | |
| ＞1 [25] and ≤ 2 [50] | 38,000 [260] | 45,000 [310] | 49,000 [340] | ||
| ＞2 [50] and ≤ 3 [76] | 36,500 [250] | 42,500 [290] | 47,500 [330] | ||
| ＞3 [76] and ≤ 4 [100] | 35,000 [240] | 40,000 [280] | 46,000 [315] | ||
| Elongation, min, % | - | 25 | 24 | 23 | |
| Impact Energy | min, average, ft/Ibf [J] | - | 20 [27] | 20 [27] | 20 [27] |
| min, single, ft/Ibf [J] | - | 14 [19] | 14 [19] | 14 [19] | |
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A The elongation may be determined on a gage length of either 2 in. or 8 in. [50 mm or 200 mm] at the manufacturer's choice.
B Impact tests are not required for thicknesses smaller than or equal to 0.250 in. [6.3mm], unless specified.
C The maximum test temperature shall be 0°F [–18°C].
D For wall thicknesses 1.5 in. [38 mm] and less, the specimens shall be located with their surface at least 0.08 in. [2 mm] from the material surface; for wall thicknesses greater than 1.5 in. [38mm], the specimens shall be located with their surface at least 1/4 times the wall thickness from the material surface.
E Once Charpy V-notch impact test shall be made from a length of tubing representing each lot.
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Dimensional Tolerance
| List | Tolerance | Shape | |
| Outer Diameter | ＞2 in [50 mm] | ±1 % | all |
| ≤ 2 in [50 mm] | ±1/48 in [0.50 mm] | ||
| Wall Thickness | -10 % | all | |
| Weight | -3.5 % – +10% | all | |
| Length (L) | ≤ 7m [22 ft] | -1/4 in – +1/2 in [-6 mm – +13 mm] | all |
| 7-14m [22-44 ft] | -1/4 in – +3/4 in [-6 mm – +19 mm] | ||
| Straightness | Lengths (L) are ft: L/40 (Results in inch); Lengths (L) are m: 2L (Results in mm); |
all | |
| Squareness of Sides | 90°±1° | square and rectangular | |
| Radius of Corners | each outside corner of the section shall not exceed two times the specified wall thickness. | square, rectangular, and special shapes | |
| Twist | not vary more than 1/12 in [2.1 mm] plus 1/144 in/ft [0.5 mm/m] | square, rectangular, and special shapes | |
| Concavity and Convexity | 1 % from the outside dimension | square, rectangular, and special shapes | |
- ASTM A501 structural pipe is mostly available in random lengths of 16-22 ft (5-7 m) or 32-44 ft (10-14 m), and can also be supplied in specified lengths.
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