Description
Factory-direct pricing with no middlemen — every ASTM A500 EN 10219 seamless square rectangular hollow section supplier quote comes straight from our 3 production lines in Jinan, cutting coordination costs for EPC contractors and steel distributors across 50+ countries.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | ASTM A500 / EN 10219 / EN 10210 Seamless Square and Rectangular Hollow Section |
| Product Type | Seamless Square and Rectangular Steel Tube / Hollow Structural Section (HSS/SHS/RHS) |
| Steel Grade | Gr.B, S235, S275, S355, STK400 |
| Standard | ASTM A500, ASTM A53, EN 10219, EN 10210, NZS 1163, GB/T 3091 |
| Section Shape | Square / Rectangular |
| Size Range | 19mm × 19mm – 800mm × 800mm |
| Wall Thickness | 1 – 30 mm |
| Length | 5.8m / 6m / 11.8m / 12m / DRL / SRL / Random Length |
| Technique | Welded (ERW) / Seamless |
| Surface Treatment | Black Painting / Galvanized / Varnish / Bare |
| Tolerance | ±1% |
| Ends | Plain / Beveled (upon request) |
| Application | Steel structures / Construction frames / Curtain wall / Support tubes / Building structures / Machinery |
| MOQ | 5 Tons |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| EPC Contractors & Steel Fabricators | Industrial building frames, warehouse portal frames, equipment support structures |
| Construction Companies | High-rise column systems, bridge handrails, infrastructure support tubes |
| Machinery Manufacturers | Conveyor frame structures, crane boom sections, hydraulic support columns |
| Curtain Wall & Façade Systems | Vertical mullion tubes, horizontal transom members, structural glazing supports |
Where Negative Tolerance Turns a 30-Ton Order Into a Structural Liability
Wall thickness at ±1% keeps every ASTM A500 EN 10219 seamless square rectangular hollow section within certified dimensional range.
I have stood on project sites where containers arrived with RHS measuring 6.5mm on a nominal 8mm wall — the whole batch failed ASTM A500 compliance, the structure could not proceed, and months of schedule vanished. Negative tolerance beyond standard limits does not just affect theoretical weight; it changes load-bearing capacity, weld penetration depth, and bolt-hole alignment on connection plates. When procurement teams buy from traders who cannot guarantee dimensional consistency, the real cost shows up at the inspection stage, not the invoice stage. [NEED_CITE: EN 10219 dimensional tolerance requirements for cold-formed hollow sections]
Matching Hollow Section Dimensions to Structural Load Paths
Every 19×19mm to 800×800mm ASTM A500 EN 10219 seamless square rectangular hollow section we produce maps directly to engineering load calculations. For column applications in mid-rise frames, S355 grades deliver higher yield capacity in smaller cross-sections, reducing self-weight while maintaining stiffness. In conveyor structures and machinery frames, the flat face of square and rectangular profiles provides full-contact bearing surfaces for bolted connections — no gusset plates needed for simple joints. Our in-house physical and chemical laboratory tests every heat before release, so when an EPC contractor in Southeast Asia orders 200×200×8mm RHS for a warehouse project, the mill test certificate matches the material that arrives at port.
Structural Code Compliance and Surface Protection for Harsh Environments
Engineering design to EN 1993 or AISC 360 requires verified material properties and documented traceability by heat number. [NEED_CITE: ASTM A500 Grade B mechanical property requirements for structural applications] For projects in coastal or industrial corrosion zones, hot-dip galvanized ASTM A500 EN 10219 seamless square rectangular hollow section provides long-term protection without field coating maintenance. In contrast, black painted or bare finishes suit indoor structural frames or applications where field welding and modification are expected. CE certification under EN 10210 and EN 10219 is mandatory for EU market imports — missing the CE mark means customs holds, project delays, and potential rejection by the supervising engineer. Random length and fixed-length options allow site teams to minimize cutting waste, while beveled ends prepare tubes for direct butt-weld splicing.
Steel Grade Selection and Production Process Explained
The S-series (S235, S275, S355) follows EN 10219/10210 with yield strength increasing by grade — S355 carries roughly 50% more load than S235 in the same cross-section, making it the default for primary structural members. ASTM A500 Gr.B serves the North American market with equivalent structural performance. JIS STK400 covers Japanese-spec projects common in Southeast Asia. Seamless production eliminates the weld seam, making it suitable for higher-pressure applications and visible architectural elements where surface uniformity matters. ERW welded hollow sections offer cost efficiency for standard structural use where internal pressure is not a factor. Surface treatment selection depends on the service environment: galvanized for outdoor exposure, black painted for temporary protection during transit and fabrication, bare for projects requiring field-applied coating systems matched to specific corrosion categories.
The Hidden Cost of Unverified Material on Structural Projects
Ordering the wrong grade or accepting undocumented negative tolerance creates costs that never appear on the purchase order. A batch of S235 tubes delivered as S355 will pass visual inspection but fail structural load testing — the entire frame may need replacement. Missing or falsified mill test certificates trigger customs holds at EU and North American ports, adding demurrage charges and weeks of delay. [NEED_CITE: steel grade equivalence and substitution rules between EN 10219 and ASTM A500] Without third-party inspection from SGS or BV, buyers have no independent verification that wall thickness, chemical composition, and mechanical properties match the standard claimed. The structure gets built, the engineer signs off, and years later a connection fails — traceability back to the original heat number becomes impossible.
Procurement Confidence from a Verified Hollow Section Manufacturer
Every ASTM A500 EN 10219 seamless square rectangular hollow section ships from our own 3 production lines in Jinan — no trading company markup, no quality handoff between factories. Our in-house physical and chemical laboratory performs real ultrasonic wall-thickness checks, tensile testing, and chemical analysis on every heat, producing original mill test certificates before material leaves the floor. With 2,800+ specifications covering side lengths from 19×19mm to 800×800mm and wall thickness up to 30mm, non-standard and custom profiles avoid the long lead times and high MOQs that fragment sourcing across multiple suppliers. Our 41 patents include proprietary sharp-corner rectangular tube technology that fills gaps in the global market for architectural and structural applications requiring tight corner radii. CE certification under EN 10210 and EN 10219, ISO 9001:2015 registration, and SGS/BV third-party inspection coverage ensure customs clearance and project compliance across EU, North America, and 50+ export destinations. Professional loading plans optimize container utilization for heavy structural sections, and door-to-door logistics coordination removes port-handling uncertainty for overseas buyers.
Documentation & Compliance
- Mill test certificate documenting S355JR chemical composition and yield strength per EN 10219, with heat number traceability
- CE certificate covering EN 10210 and EN 10219 for EU market structural hollow section compliance
- ISO 9001:2015 quality management system certificate covering full production and inspection process
- SGS or BV third-party inspection report verifying wall thickness, dimensions, and surface quality before shipment
- Material traceability documentation linking each bundle to its original heat number and production batch
- Customs document package including packing list, bill of lading, and certificate of origin for destination-country clearance
Packaging, Loading & Delivery
- Seamless and welded S355 / Gr.B hollow sections packed in steel strip bundles with seaworthy wrapping, sized for 5.8m and 6m fixed lengths to maximize 20ft and 40ft container loading
- Galvanized ASTM A500 EN 10219 seamless square rectangular hollow section bundled with edge protectors and moisture-resistant wrapping to preserve zinc coating during ocean transit
- Container loading plans optimized for 800×800mm large-section RHS and 19×19mm small SHS mixed shipments, maximizing weight utilization without exceeding port crane limits
- Heat number and steel grade stenciled on each bundle end for site identification and traceability verification upon arrival
- FOB, CIF, and DDP shipping terms available with real-time tracking from Jinan inland depot to destination port or project site
Start Your Hollow Section Procurement With Verified Specifications
Submit your ASTM A500 EN 10219 seamless square rectangular hollow section requirements — including section size, wall thickness, steel grade, quantity, and destination port — and receive a detailed quotation with production lead time, applicable certifications, and mill test certificate confirmation within 12 hours.
Request a Quote With Mill Test Certificate Confirmation
Send your specifications via email to admin@sdxjysteel.com or contact us on WhatsApp at +86 188 5315 7756 to begin your procurement process.
