Description
Factory-direct pricing, no middlemen — Every ASTM A500 GR.B rectangular hollow section rolls off our own mill and ships under our direct supervision, eliminating trading markups from day one.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | ASTM A500 GR.B Rectangular Hollow Section |
| Product Type | Rectangular Steel Tube / RHS |
| Steel Grade | GRB, A53(A.B), Gr.B, S235, S275, S355, STK400 |
| Standard | ASTM A500, ASTM A53, GB/T 3091 |
| Section Shape | Rectangular |
| Size Range | 15mm×20mm – 700mm×800mm |
| Wall Thickness | 1 – 30 mm |
| Length | 5.8m / 6m / 11.8m / 12m / DRL / SRL / Random Length |
| Technique | Welded or Seamless |
| Surface Treatment | Black Painting / Galvanized / Varnish / Bare |
| Tolerance | ±1% |
| Ends | Plain |
| Processing Service | Bending, Cutting |
| Application | Construction Structure, Building, Curtain Wall, Support Tubes, Structure Pipe, Fluid Pipe, Boiler Pipe |
| MOQ | 5 Tons |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| EPC Contractors | Steel structure frames for industrial plants and warehouse buildings |
| Construction Companies | Curtain wall support systems and high-rise building columns |
| Machinery Manufacturers | Conveyor frames and equipment base structures requiring precise rectangular profiles |
| Infrastructure Developers | Bridge support tubes and urban transit station frameworks |
What Negative Wall Tolerance Really Costs on a GR.B Structural Frame
A ±1% tolerance on a 30mm wall means the difference between passing structural inspection and tearing down a completed frame.
I have seen project sites where rectangular hollow sections arrived with wall thickness drifting below the ASTM A500 minimum. The fabricator only discovered it after cutting weld prep grooves — the actual metal was thinner than the mill certificate claimed. Every column on that floor had to be replaced. When you source an ASTM A500 GR.B rectangular hollow section supplier without in-house lab verification, you inherit that risk. Material traceability becomes a guess, and customs agents at the destination port will not accept a certificate they cannot verify against heat numbers [NEED_CITE: ASTM A500 GR.B mechanical property requirements and testing methods].
How 1–30mm Wall Thickness Covers Every Structural Load Tier
From 15×20mm light-gauge RHS used in curtain wall purlins to 700×800mm heavy sections carrying multi-story column loads, this ASTM A500 GR.B rectangular hollow section supplier maintains ±1% tolerance across the full 1–30mm wall range. Thin-wall sections (1–3mm) serve non-load-bearing cladding supports where weight savings matter. Mid-range walls (4–10mm) handle typical building frames and machinery bases. Heavy walls (11–30mm) carry primary structural loads in bridges and industrial facilities. Each tier requires different rolling parameters and cooling rates — our three dedicated production lines handle all ranges without outsourcing to secondary mills.
Meeting ASTM A500 and EN 10219 Compliance Across Export Markets
Structural engineers designing to AISC specifications require ASTM A500 GR.B certification for North American projects, while EU-based contractors need EN 10210 or EN 10219 compliance for CE marking. This ASTM A500 GR.B rectangular hollow section supplier holds both certification tracks, meaning the same product family can serve projects in Houston and Hamburg without respecification. Galvanized surface treatment extends service life in coastal or industrial corrosion environments, while black painting suits indoor structural applications where appearance matters less than cost. Plain ends ship ready for site welding or mechanical connection [NEED_CITE: EN 10219 cold-formed structural hollow section dimensional tolerances].
Steel Grade Selection: GR.B vs S355 vs STK400 Across Standards
GR.B under ASTM A500 and S355 under EN 10219 occupy similar yield strength tiers but differ in chemical composition limits and testing protocols. STK400, specified under JIS G3466, targets general structural use in Japanese-standard projects. When a project calls for GR.B, substituting S235 saves cost but reduces load capacity — the reverse substitution (using S355 where GR.B is specified) over-engineers the structure. Our ASTM A500 GR.B rectangular hollow section supplier inventory covers GRB, S235, S275, S355, and STK400 so engineers can select the exact grade their calculations require. Welded (ERW) production suits standard structural applications at competitive pricing, while seamless options handle higher pressure demands in boiler and fluid pipe roles.
The Hidden Price of Unverified Mill Certificates
Pricing an ASTM A500 GR.B rectangular hollow section supplier quote without confirming mill test certificate authenticity invites three failure modes: material that fails第三方 inspection at destination port, steel grade mismatches discovered during fabricator incoming inspection, and tolerance drift that voids structural engineer sign-off. Each scenario triggers demurrage charges, air-freight replacement costs, or project delays measured in weeks. Our in-house physical and chemical laboratory tests every heat before release, and third-party inspection via SGS or BV is available for clients who require independent verification [NEED_CITE: steel grade equivalence tables between ASTM EN and JIS standards].
Why This ASTM A500 GR.B Rectangular Hollow Section Supplier Ships Differently
Factory-direct pricing means you pay mill rates, not trader markups — every order ships from our Jinan facility with no intermediate handling. Our 2,800+ specification range covers standard ASTM A500 sizes plus non-standard dimensions other mills refuse to roll, eliminating the need to source rectangular tubes from multiple vendors. The proprietary sharp-corner rectangular tube technology we developed fills a gap in global supply — standard mills produce rounded-corner RHS that creates gaps at welded connections, while our sharp-corner process delivers tight-fit joints for architectural and structural applications. Every shipment includes original mill test certificates with heat-number traceability, and our professional loading team optimizes container stowage for 5.8m, 6m, and 12m lengths to minimize freight cost per ton.
Documentation & Compliance
- Mill test certificate documenting GR.B chemical composition and mechanical properties per ASTM A500, with heat number traceability for every piece
- CE certificate covering EN 10210 and EN 10219 for European project compliance and customs clearance
- ISO 9001:2015 quality management certificate covering production, inspection, and delivery processes
- SGS or BV third-party inspection report available upon request for independent quality verification
- Material traceability documentation linking each rectangular hollow section to its original heat number and production batch
- Complete customs document package including packing list, bill of lading, and certificate of origin
Packaging, Loading & Delivery
- ASTM A500 GR.B rectangular hollow sections bundled with steel strips and edge protectors to prevent surface damage during ocean transit
- Galvanized RHS sections wrapped with waterproof paper and plastic film to preserve zinc coating integrity in humid shipping environments
- Container loading optimized for 6m and 12m random lengths, with professional stowage plans maximizing payload per 20ft or 40ft container
- Custom cutting service available for DRL (double random length) orders, reducing on-site waste and handling time
- Heat number and steel grade marked on each bundle for site identification and inspection verification
- FOB, CIF, and DDP shipping options with door-to-door logistics coordination to 50+ countries
Start Your ASTM A500 GR.B Rectangular Hollow Section Inquiry
Submit your specification sheet — section size, wall thickness, steel grade, quantity, and destination port — and receive a detailed quotation within 12 hours including unit pricing, mill test certificate confirmation, and production lead time. For non-standard dimensions outside the 15×20mm to 700×800mm range, our technical team provides custom rolling feasibility assessment and MOQ guidance.
Get Your ASTM A500 GR.B RHS Quote with Mill Test Certificate
Send your specification requirements to admin@sdxjysteel.com or contact us via WhatsApp at +86 188 5315 7756 to receive pricing, certification documents, and delivery schedule for your project.
Frequently Asked Questions
Q: What steel grades are available for ASTM A500 rectangular hollow sections?
A: We stock GRB, A53(A.B), Gr.B, S235, S275, S355, and STK400 across the full 15×20mm to 700×800mm size range. Each grade meets its respective standard requirements — GR.B conforms to ASTM A500, S-series grades meet EN 10219, and STK400 follows JIS G3466.
Q: Can you provide mill test certificates for customs clearance?
A: Yes, every shipment includes original mill test certificates documenting chemical composition and mechanical properties per ASTM A500, with heat number traceability. Third-party inspection via SGS or BV is available for additional verification if required by your project specifications.
Q: What is the MOQ for custom non-standard rectangular hollow sections?
A: Standard sizes within our 2,800+ specification range have a 5-ton MOQ. Custom non-standard dimensions outside catalog sizes require technical review — contact our team with your drawing specifications for feasibility assessment and quantity requirements.
Q: How do you ensure wall thickness tolerance meets ASTM A500 requirements?
A: Our in-house physical and chemical laboratory conducts incoming material inspection, in-process monitoring, and final dimensional verification before shipment. Tolerance is maintained at ±1% across the 1–30mm wall thickness range, with full inspection reports provided prior to loading.
Q: What surface treatment options are available for outdoor structural applications?
A: We offer galvanized coating for maximum corrosion resistance in outdoor and coastal environments, black painting for indoor structural applications, varnish for temporary protection during transit and storage, and bare (uncoated) delivery for projects requiring on-site surface preparation.
