Description
One-Stop Rectangular Hollow Section Procurement — ASTM A500 GR.B, S355JRH, and Q345B grades in 15×20mm to 700×800mm sizes all verified with original mill test certificates before dispatch.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | ASTM A500 GR.B Rectangular Hollow Section |
| Product Type | Welded Rectangular Steel Tube (RHS) |
| Steel Grade | Gr.B, S355JRH, Q235B, Q345B, S235, S275, S355, STK400 |
| Standard | ASTM A500, ASTM A53, GB/T 3091, DIN |
| Section Shape | Rectangular / Square |
| Size Range | 15mm×20mm – 700mm×800mm |
| Wall Thickness | 1 – 30 mm |
| Length | 5.8m / 6m / 11.8m / 12m / Random Length |
| Technique | ERW Welded / Seamless |
| Surface Treatment | Black Painting / Galvanized / Varnish / Bare / Oiled |
| Tolerance | ±12.5% |
| Ends | Plain |
| Invoicing | By Theoretical Weight |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Construction & Building | Steel structure frames, curtain wall support systems, column and beam assemblies |
| Infrastructure | Bridge handrails, highway sign gantries, lighting pole bases |
| Machinery & Equipment | Conveyor structures, crane booms, industrial platform supports |
| Shipbuilding & Offshore | Deckhouse framing, equipment mounting brackets |
What Hidden Negative Tolerance Costs on a Structural Frame Order
Every millimeter of wall-thickness deviation compounds into load-bearing risk across an entire building frame.
Structural engineers specify ASTM A500 GR.B rectangular hollow section based on calculated section modulus. When actual wall thickness falls below the declared tolerance band, the moment of inertia drops — and no amount of on-site welding compensates for that deficit. I once watched a 300×100 RHS batch get rejected at Dubai port because the third-party inspector found wall thickness deviations that pushed theoretical weight nearly a full ton below the invoice figure. The entire container sat at Jebel Ali for three weeks while the buyer scrambled for replacement material. [NEED_CITE: EN 10219 cold-formed hollow section dimensional tolerance requirements]
Matching Cross-Standard Grades to Project Specifications
Global projects rarely stay within a single national standard. A curtain wall contractor in Southeast Asia might receive drawings calling for S355JRH, while the structural engineer’s calculation sheet references ASTM A500 GR.B equivalent properties. Our ASTM A500 GR.B rectangular hollow section inventory covers Gr.B, S355JRH, Q235B, Q345B, S235, S275, and STK400 — allowing fabricators to source one supplier for mixed-standard projects rather than splitting orders across multiple mills and risking inconsistent chemistry between heats.
Structural Compliance and Surface Protection for Engineering Environments
Load-bearing frames in coastal or industrial atmospheres demand more than just the right steel grade. Galvanized ASTM A500 GR.B rectangular hollow section provides sacrificial zinc protection for outdoor structural applications, while black painted or oiled finishes suit indoor fabrication where welding preparation takes priority. For projects requiring CE marking under EN 10219 for European market access, or ASTM A500 certification for North American building codes, every batch ships with full chemical composition and mechanical property documentation traceable to the original heat number. [NEED_CITE: steel grade equivalence mapping between ASTM A500 and EN 10219 standards]
Understanding ERW Welding, Grade Selection, and Tolerance Implications
The ERW welded process produces ASTM A500 GR.B rectangular hollow section with a longitudinal seam that, when properly controlled, delivers consistent mechanical properties across the entire profile. For applications requiring higher formability or tighter dimensional control, seamless options are available in the same size range. Wall thickness from 1mm to 30mm covers both light-gauge architectural sections and heavy structural members. The ±12.5% tolerance band aligns with standard mill practice, but buyers should verify whether their project specification calls for tighter tolerance classes — particularly for thin-walled sections where even small deviations significantly affect weight-per-meter calculations. Surface treatment selection directly impacts fabrication sequence: galvanized tubes require welding procedure adjustments, while bare or oiled finishes allow immediate cutting and joining.
The Real Price of Unverified Material on Site
Accepting rectangular hollow sections without original mill test certificates means accepting unknown chemistry and unconfirmed mechanical properties. When a structural inspector requests heat number verification and the supplier cannot provide traceable documentation, the entire batch becomes suspect — triggering re-inspection costs, project delays, and potential rejection by the client’s engineering team. ASTM A500 GR.B rectangular hollow section shipped without proper certification may clear customs initially, but fails audit trails during building occupancy permit applications. [NEED_CITE: third-party inspection requirements for structural steel hollow sections]
Why Fabricators and EPC Contractors Source Here
Every ASTM A500 GR.B rectangular hollow section leaving our warehouse carries an original mill test certificate showing chemical composition, yield strength, tensile strength, and elongation — verified against the heat number stamped on each piece. Our ISO 9001:2015 and CE certification, combined with SGS and BV third-party inspection availability, satisfies the most stringent project documentation requirements. The size range from 15×20mm to 700×800mm with wall thickness up to 30mm means structural fabricators can consolidate orders rather than managing multiple suppliers for different section sizes. Custom cutting to specific lengths reduces on-site waste and welding joints. Professional heavy cargo loading experience ensures that long-length tubes arrive without bending damage or surface coating degradation.
Documentation & Compliance
- Mill test certificate documenting ASTM A500 GR.B chemical composition and mechanical properties per heat number
- CE certificate confirming EN 10219 compliance for European market structural applications
- ISO 9001:2015 quality management system certificate covering production and inspection processes
- SGS or BV third-party inspection report available upon request before shipment
- Full material traceability from raw coil to finished rectangular hollow section by heat number
- Export documentation including packing list, bill of lading, and certificate of origin
Packaging, Loading & Delivery
- ASTM A500 GR.B rectangular hollow section bundled with steel strips and edge protectors to prevent surface damage during ocean transit
- Galvanized RHS tubes wrapped with waterproof paper and plastic film to preserve zinc coating integrity
- Black painted or oiled surfaces protected with anti-rust measures suitable for long-distance shipping
- Custom cut-to-length service available for 5.8m, 6m, 11.8m, and 12m standard lengths or project-specific dimensions
- Container loading optimized for rectangular section geometry to maximize weight utilization within shipping limits
- FOB, CIF, and DDP terms available with professional flatbed and open-top container loading for heavy sections
Getting Your Quote and Mill Test Certificate
Submit your ASTM A500 GR.B rectangular hollow section inquiry with steel grade, section dimensions, wall thickness, quantity, and destination port. We respond within 12 hours with pricing, available mill test certificate preview, and estimated production timeline. For non-standard sizes or custom cutting requirements, share your fabrication drawings and we confirm feasibility and lead time.
Frequently Asked Questions
Q: What is the difference between ASTM A500 GR.B and S355JRH for rectangular hollow sections?
A: ASTM A500 GR.B is a North American standard specifying minimum yield strength of 42 ksi (290 MPa) for structural hollow sections, while S355JRH is a European EN 10219 grade with 355 MPa minimum yield strength. Both serve similar structural applications but require different certification documentation for their respective markets. We supply both grades with original mill test certificates showing compliance to the specified standard.
Q: Can you provide third-party inspection before shipment?
A: Yes. SGS and BV third-party inspection services are available for ASTM A500 GR.B rectangular hollow section orders. The inspection covers dimensional verification, surface quality, wall thickness measurement, and mill test certificate validation. Inspection reports are issued before container loading to confirm compliance with your purchase order specifications.
Q: What is the minimum order quantity for custom cut-to-size rectangular hollow sections?
A: We process custom cutting orders for ASTM A500 GR.B rectangular hollow section across the full size range from 15×20mm to 700×800mm. Minimum order quantities depend on section size and total tonnage. Contact us with your specific dimensions and quantities for a detailed quote including cutting fees and delivery timeline.
Q: How do you ensure wall thickness meets the ±12.5% tolerance?
A: Every production batch undergoes dimensional inspection including wall thickness measurement at multiple points along the tube length. Results are documented in the mill test certificate and dimensional inspection report provided with shipment. For projects requiring tighter tolerance control, we can arrange third-party verification before dispatch.
Q: What surface treatment options are available for outdoor structural applications?
A: For outdoor exposure, galvanized ASTM A500 GR.B rectangular hollow section provides long-term corrosion protection through sacrificial zinc coating. Black painted finishes offer moderate protection for sheltered applications, while bare or oiled tubes suit indoor fabrication where welding preparation is the priority. Surface treatment selection should consider the installation environment and maintenance access.
Request Your ASTM A500 GR.B Rectangular Hollow Section Quote Today
Send your specifications including steel grade, section size, wall thickness, quantity, and destination to receive pricing and mill test certificate documentation within 12 hours.
Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Website: www.xjyplate.com
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@xjyplate.com
