ASTM A500 Hollow Structural Steel Tubes Manufacturer and Supplier – Brisk Steel
| Standard | ASTM A500/A500M |
| Material | Carbon steel pipe |
| Manufacture | Cold-formed welded and seamless |
| Grade | Grade B, Grade C, and Grade D |
| Out Diameter | ≤88 in [2235 mm] |
| Wall Thickness | ≤1 in [25.4 mm] |
| Length | 1.5 – 18 mtrs |
| Surface Coating | Varnishing, Black, Oiling, Hot Dip Galvanizing |
| End Type | Square cut, Bevelled, Threaded, Grooved |
What is the ASTM A500?
Chemical Composition
| Chemical Requirements | ||||
| Element | Composition, % | |||
| Grade B, D | Grade C | |||
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Heat Analysis
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Product Analysis
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Heat Analysis
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Product Analysis
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| C, MaxA | 0.26 | 0.30 | 0.23 | 0.27 |
| Mn, MaxA | 1.35 | 1.40 | 1.35 | 1.40 |
| P, Max | 0.035 | 0.045 | 0.035 | 0.045 |
| S, Max | 0.035 | 0.045 | 0.035 | 0.045 |
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Cu, MinB |
0.20 | 0.18 | 0.20 | 0.18 |
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A 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.
B If copper-containing steel is specified in the purchase order.
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Heat Treatment
- Grade D tubing shall be heat treated at a temperature of at least 1100 °F (590 °C) for one hour per inch (25.4 mm) of thickness.
- ASTM A500 allows all grades to be stress-relieved or annealed.
Mechanical Properties
| Round, Square, Rectangular, and Special Tubular Shapes | |||
| / | Grade B | Grade C | Grade D |
| Tensile strength, min | 58000 psi [400 MPa] | 62000 psi [425 MPa] | 58000 psi [400 MPa] |
| Yield strength, min | 46000 psi [315 MPa] | 50000 psi [345 MPa] | 36000 psi [250 MPa] |
| Elongation in 2 in. (50 mm), min, % C | 23 A | 21 B | 23 A |
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A Applies to specified wall thicknesses (t) equal to or greater than 0.180 in. [4.57mm]. For lighter specified wall thicknesses, the minimum elongation values shall be calculated by the formula: percent elongation in 2 in. [50 mm] = 61t+ 12, rounded to the nearest percent. For A500M use the following formula: 2.4t+ 12, rounded to the nearest percent.
C The minimum elongation values specified apply only to tests performed before shipment of the tubing. |
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Flattening Test, Flaring Test, and Wedge Crush Test
- Round structural tubes are subjected to flattening tests and flaring tests (Out Diameter ≤ 10 in.)
- Square or rectangular structural tubes are subjected to a flattening test, flaring test, or wedge crush test.
Dimensional Tolerance
Tolerance on Outer Diameter
- Rounds structural tubing:
| Specified Outside Large Flat Dimension, in [mm] | Permissible Variations Over and Under Specified Outside Flat Dimensions, in [mm] |
| ≤ 2 in [50 mm] | ±0.5% |
| ＞ 2 in [50 mm] | ±0.75% |
- Square and rectangular structural tubing:
| Specified Outside Large Flat Dimension, in [mm] | Permissible Variations Over and Under Specified Outside Flat Dimensions, in [mm] |
| ≤2 1/2 [65] | 0.020 [0.5] |
| ＞2 1/2 – ≤ 3 1/2 [＞65 – ≤90] | 0.025 [0.6] |
| ＞3 1/2 – ≤ 5 1/2 [＞90 – ≤140] | 0.030 [0.8] |
| ＞5 1/2 [140] | 0.01 times large flat dimension |
Tolerance on Wall Thickness
- ±10% specified wall thickness (excluding thickness at weld position).
- Welded structural tubing: If the internal weld has been removed from the welded steel pipe, the thickness at the weld location is not less than 90% of the specified wall thickness.
- Square and rectangular structural tubing: Wall thickness requirements apply only to the center of the plane.
Tolerance on Length
| Length Tolerances for Specific Lengths of Structural Tubing | ||
| Length | ≤22 ft [6.5 m] | ＞22 ft [6.5 m] |
| Tolerances | -1/4 in. – +1/2 in. [-6 mm – +13 mm] | -1/4 in. – +3/4 in. [-6 mm – +19 mm] |
Tolerance on Straightness
The permissible variation for straightness of structural tubing shall be 1/8 in. times the number of feet [10 mm times the number of meters] of total length divided by 5.
Tolerance on Squareness of Sides
For square and rectangular structural tubing, adjacent sides shall be square (90°), with a permissible variation of ±2° max.
Tolerance on Radius of Corners
For square and rectangular structural tubing, the radius of each outside corner of the section shall not exceed three times the specified wall thickness.
Tolerance on Twist
| Specified Otuside Large Flat Dimension, in [mm] | Maximum Permissible Variations in Twist per 3 ft of length [Twist per Meter of Length], in [mm] |
| ≥1 1/2 [40] | 0.050 [1.3] |
| ＞1 1/2 – ≤ 2 1/2 [＞40 – ≤65] | 0.062 [1.6] |
| ＞2 1/2 – ≤ 4 [＞65 – ≤100] | 0.075 [1.9] |
| ＞4 – ≤ 6 [＞100 – ≤150] | 0.087 [2.2] |
| ＞6 – ≤ 8 [＞150 – ≤200] | 0.100 [2.5] |
| ＞8 [200] | 0.112 [2.8] |
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