Heavy Duty Hot Rolled Hollow Sections for Industrial Applications
Heavy Duty Hot Rolled Hollow Sections for Industrial Applications
Specifications
Hot rolled hollow sections are steel profiles formed at high temperatures—typically exceeding 900°C—resulting in a product with superior structural integrity, uniform material properties, and reduced internal stress. Available in circular (CHS), square (SHS), and rectangular (RHS) shapes, these closed sections offer exceptional strength-to-weight ratios, high torsional resistance, and excellent performance in compression, making them ideal for heavy-duty columns, bridges, and large-span industrial or commercial structures.
| American Standard | Standard Name |
| A500/A500M | Standard Specification for Cold-Formed Welded and Seamless Carbon Steel Structural Tubing in Rounds and Shapes |
Hot Rolled Hollow Sections Chemical Composition
Sources American Standard A500 / A500M TABLE 1 Chemical Requirements
| Element | Composition, % | |||
| Grades A, B and D | Grace C | |||
| Heat | Product | Heat | Product | |
| Analysis | Analysis | Analysis | Analysis | |
| Carbon, max A | 0.26 | 0.3 | 0.23 | 0.27 |
| Manganese, max A | 1.35 | 1.4 | 1.35 | 1.4 |
| Phosphorus, max | 0.035 | 0.045 | 0.035 | 0.045 |
| Sulfur, max | 0.035 | 0.045 | 0.035 | 0.045 |
| Copper, min B | 0.2 | 0.18 | 0.2 | 0.18 |
| 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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Hot Rolled Hollow Sections Mechanical Properties
Sources American Standard A500 / A500M TABLE 2 Tensile Requirements
| Round structural tubing | ||||
| Grade A | Grade B | Grade C | Grade D | |
| Tensile strength, min, psi (MPa) | 45,000 (310) | 58,000 (400) | 62,000 (425) | 58,000 (400) |
| Yield strength, min, psi, (MPa) | 33,000 (230) | 42,000 (290) | 46,000 (315) | 36,000 (250) |
| Elongation in 2 in. (50 mm), min, %D | 25A | 23B | 21C | 23B |
| Shaped structural tubing | ||||
| Grade A | Grade B | Grade C | Grade D | |
| Tensile strength, min, psi (MPa) | 45,000 (310) | 58,000 (400) | 62,000 (425) | 58,000 (400) |
| Yield strength, min, psi, (MPa) | 39,000 (270) | 46,000 (315) | 50,000 (345) | 36,000 (250) |
| Elongation in 2 in. (50 mm), min, %D | 25A | 23B | 21C | 23B |
| A Applies to specified wall thicknesses (t) equal to or greater than 0.120 in. (3.05 mm). For lighter specified wall thicknesses, the minimum elongation values shall be calculated by the formula: percent elongation in 2 in. (50mm) = 56t + 17.5, rounded to the nearest percent. For A500M use the following formula: 2.2t + 17.5, rounded to the nearest percent. B Applies to specified wall thicknesses (t) equal to or greater than 0.180 in. (4.57 mm). 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 Applies to specified wall thicknesses (t) equal to or greater than 0.120 in. (3.05 mm). For lighter specified wall thicknesses, the minimum elongation values shall be by agreement with the manufacturer. D The minimum elongation values specified apply only to tests performed prior to shipment of the tubing. |
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Hot Rolled Hollow Sections Manufacturing Process
Hot Rolled Hollow Sections Application
- Heavy-Duty Structural Frameworks
- Infrastructure and Heavy Civil Engineering
- Offshore and Marine Structures
- Mining and Heavy Equipment Manufacturing
- Pressure Vessel and Boiler Applications
- Energy and Power Generation
- Automotive and Commercial Vehicle Chassis
- Storage Tanks and Industrial Silos
Hot Rolled Hollow Sections Packing & Loading
Hollow Section is transported in containers
Hollow Section is transported in containers
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