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ASTM A500 HSS Structural Steel Tube | Square & Rectangular Hollow Steel Pipe
| Item | Details |
| Product Name | ASTM A500 HSS Structural Steel Tube |
| Standard | ASTM A500 / ASTM A500M |
| Grades | Grade B / Grade C |
| Material | Carbon Steel |
| Shape | HSS Rectangular Tube & HSS Square Steel Pipe |
| Manufacturing Process | ERW Welded |
| Outer Size | 20×10 mm – 500×300 mm (Customized Available) |
| Wall Thickness | 1.0 – 25 mm |
| Length | 6 m / 12 m / Customized |
| Surface | Black, Galvanized, Painted, Oiled |
| Certification | MTC, SGS, Mill Test Certificate |
| Chemical Composition (Typical) | ||||
| Grade | C | Mn | P | S |
| ASTM A500 Gr.B | ≤0.26% | ≤1.35% | ≤0.035% | ≤0.035% |
| ASTM A500 Gr.C | ≤0.23% | ≤1.35% | ≤0.035% | ≤0.035% |
| Mechanical Properties | ||
| Grade | Yield Strength | Tensile Strength |
| ASTM A500 Gr.B | ≥46 ksi (315 MPa) | ≥58 ksi (400 MPa) |
| ASTM A500 Gr.C | ≥50 ksi (345 MPa) | ≥62 ksi (425 MPa) |
ASTM A500 Grade B & C — structural square and rectangular HSS tubing, produced and tested to ASTM A500 specifications with full mill test reports (MTR) on every order.
Square (SHS) 20×20mm – 400×400mm · Rectangular (RHS) 30×50mm – 400×600mm — wall thickness from 1.5mm to 16mm, standard lengths 6m / 12m, cut-to-length available.
Load-bearing performance you can specify — Grade B (345 MPa yield) and Grade C (427 MPa yield) options for columns, trusses, and heavy frame applications where strength-to-weight matters.
Cold-formed, precision-welded — tight corner radii, uniform wall thickness within ±0.1mm, and clean, flush weld seams that machine and weld cleanly on your shop floor.
OEM & custom runs — non-standard sizes, special lengths, pre-drilled holes, HDG / paint / powder-coat finishes, and bent or fabricated assemblies. Minimum order and lead time quoted per project.
Factory-direct, export-ready — 15+ years producing HSS tubing for overseas markets, containerized packing with detailed loading plans, and third-party inspection (SGS / BV) available before shipment.
ASTM steel pipe refers to carbon steel pipe used in oil and gas transmission systems. It is also used to transport other fluids such as steam, water, and mud.
| Product Type | Typical Application |
| Welded HSS Square Steel Tube | Structural frames, columns, supports, machinery |
| Carbon HSS Rectangular Steel Tube | Buildings, bridges, platforms, equipment frames |
| HSS Structural Steel Tube | Steel structures, warehouses, industrial projects |
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ASTM A500 RHS Rectangular Hollow Section Steel Tube – Surface Treatment
| Surface Treatment | Description |
| Black Bare Steel | Standard as-rolled finish with raw steel appearance; ideal for standard structural use and indoor installations. |
| Anti-Rust Oiled Surface | Light protective oil layer applied to the surface, minimizing rust formation during warehousing and overseas shipment. |
| Hot-Dip Galvanized (HDG) | Full zinc immersion coating delivers robust corrosion resistance and extended service life, recommended for outdoor projects and harsh climatic conditions. |
| Pre-Galvanized | Zinc-coated steel strip formed into tubing; provides consistent surface protection at a more economical price point. |
| Painted / Powder Coated | Custom color finishes available; improves visual aesthetics while adding an extra layer of weather resistance. |
| Epoxy Coating | Heavy-duty protective layer with strong resistance against moisture, chemical exposure and corrosive environments. |
| 3PE / FBE Coating | Premium anti-corrosion coating system engineered for heavy industrial use and critical infrastructure projects. |
HSS structural steel tube is widely used for:
Steel building structures
Warehouses and workshops
Structural columns and beams
Machinery and equipment frames
Bridges and infrastructure
Steel platforms and supports
Fencing and gates
Solar mounting structures
Agricultural and greenhouse structures
Industrial fabrication
OEM LSAW & HSS Steel Tube Manufacturer
Royal Steel Group manufactures welded LSAW pipe and ASTM A500 HSS tubing—square, rectangular, and custom profiles—built to your drawings and specifications. From material sourcing to final container loading, we handle the full supply chain in-house.
Fabrication services:
Cut-to-length · precision drilling · end beveling · custom welding · hot-dip galvanizing · industrial painting · powder coating
One-stop sourcing for overseas buyers:
HSS square and rectangular tubing (ASTM A500 Grade B/C)
LSAW welded steel pipe (large-diameter, thick-wall)
Custom carbon steel profiles and OEM fabricated assemblies
Every order includes mill test reports (MTR), pre-shipment inspection, and export packaging with container loading plans. Standard orders ship in 15–25 days; custom fabrication runs quoted per project.
Send your drawings or specs—we'll return a detailed quote within 24 hours.
ASTM-compliant structural steel products
Wide range of HSS tube sizes
OEM and customized production
Strict quality inspection
Professional export packaging
Support for bulk orders and project supply
Global shipping and documentation support
Royal Steel Group provides reliable HSS structural steel tube solutions for construction, engineering, fabrication, and industrial projects worldwide.
ASTM A500 Grade B/C RHS Packaging & Delivery
Packaging
All RHS tubes are tightly bound with steel bands for safe handling during transit.
Extra protection options: plastic end caps, waterproof wrapping and anti-rust oil as requested.
Every bundle carries clear labels listing dimensions, steel grade, heat number, quantity and destination for easy tracking.
Custom packaging solutions are offered for container, bulk cargo and long-distance transport.
Delivery
Multiple transport options: container shipment, bulk carrier, truck and rail transport to match project plans.
Small batches fit standard containers; large-volume orders can be shipped break bulk.
We schedule production and shipment strictly to hit customers’ project timelines.
Complete export paperwork provided: commercial invoice, packing list, MTC, certificate of origin and third-party inspection certificates.
Royal Steel Group delivers ASTM A500 Rectangular Steel Tube worldwide with secure packaging, stable logistics and on-time shipment guarantee.
1. What is an ASTM A500 HSS structural steel tube?
ASTM A500 HSS is a carbon-steel hollow structural section produced in square, rectangular, and round profiles. It is specified for load-bearing use in building frames, columns, bracing, and industrial fabrication.
2. What grades do you supply?
ASTM A500 Grade B (345 MPa yield) and Grade C (427 MPa yield). Grade C is the higher-strength option, typically used where weight savings or heavier loads are a factor.
3. What shapes are available?
Square (SHS), rectangular (RHS), and round HSS. Custom profiles and non-standard sections can be produced to your drawings.
4. What sizes do you offer?
Square: 20×20mm to 400×400mm. Rectangular: 30×50mm to 400×600mm. Wall thickness: 1.5mm to 16mm. Standard lengths 6m / 12m, cut-to-length available.
5. Do you offer OEM and custom fabrication?
Yes. We supply non-standard sizes, custom lengths, pre-drilled holes, end beveling, welding assemblies, and surface treatments including HDG, paint, and powder coating. Send drawings for a quote.
6. What is the difference between HSS tube and ordinary steel pipe?
HSS is engineered for structural load-bearing and is governed by ASTM A500 (dimensions, strength, tolerances). Standard steel pipe is sized for fluid or gas transport and rated by pressure (Schedule 40/80), not structural load.
7. Can HSS tubes be galvanized?
Yes. Hot-dip galvanized (HDG) square and rectangular HSS is available for outdoor, coastal, solar-mounting, fencing, and infrastructure applications where corrosion resistance is required.
8. Can you cut to custom lengths?
Yes. We supply standard 6m / 12m lengths or cut to your specified length with clean, square ends. Tolerances and end finishes can be specified per order.
9. What are common applications?
Building & construction: columns, trusses, bracing, curtain-wall framing
Industrial: machinery frames, equipment bases, platforms, racking
Infrastructure: bridge railings, sign posts, guardrails, utility structures
Energy & agriculture: solar mounting systems, greenhouse frames, livestock penning
10. How do you ensure quality?
Every batch goes through dimensional inspection, material verification (with MTR), surface and weld-seam checks, and mechanical testing. Pre-shipment inspection by SGS or BV is available on request.
ROYAL STEEL GROUP
Address
Kangsheng development industry zone,
Wuqing district, Tianjin city, China.
Phone
Hours
Monday-Sunday: 24-hour Service
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