Description
Factory-Direct ASTM A500 Gr.B Square Steel Tube — 2,800+ specifications in stock with wall thickness up to 40mm, shipped with full EN 10219/10210 CE documentation for EU and North American project clearance.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | ASTM A500 Gr.B Square Steel Tube |
| Product Type | Square / Rectangular Steel Tube (Structural Hollow Section) |
| Steel Grade | Q195, Q215, Q235, Q345, #20, #45, S195, S235JR, S355JR, A53 Grade A, A53 Grade B, A500 Grade A, A500 Grade B, A500 Grade C, STK400, SS400, ST42.2 |
| Standard | ASTM A500, ASTM A36, ASTM A53, EN 10219, EN 10210, GB/T 6728, JIS G3466 |
| Section Shape | Square / Rectangular / Round |
| Size Range | Square pipe 20×20mm–500×500mm; Rectangular pipe 20×40mm–300×500mm |
| Wall Thickness | 1.2mm–20mm |
| Length | 3m–12m (random / cut to order) |
| Technique | Hot Rolled / Welded (ERW) |
| Surface Treatment | Pre-galvanized (40–80g/m²), Hot-dip galvanized (200–600g/m²), Black / Oiled / Custom |
| Tolerance | ±1% |
| Ends | Plain |
| Application | Construction / Building materials / Structural steel frames / Solar structure components / Fence posts / Greenhouse frames / Machinery manufacturing / Steel structure engineering / Glass curtain walls |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Construction & Building | Structural frames for commercial buildings, warehouse columns, mezzanine supports |
| Architectural Facade | Glass curtain wall framing, decorative facade mullions, exposed structural joints |
| Solar & Renewable Energy | Solar panel mounting structures, ground screw foundations, tracker support rails |
| Machinery Manufacturing | Conveyor frame assemblies, equipment base structures, hydraulic support columns |
| Infrastructure & Civil | Bridge handrail posts, highway sign gantries, utility pole bases |
What Negative Wall Tolerance Really Costs on a 500mm Structural Frame Order
A 12% thickness deviation on a single batch can void an entire container at destination port inspection.
I watched a 75×75 square tube shipment get rejected after third-party re-inspection at the destination — wall thickness negative tolerance exceeded 12%, and the client’s project timeline slipped three weeks. That kind of failure does not come from the steel grade itself; it comes from inconsistent mill practices and skipped pre-shipment measurement. When procurement teams order ASTM A500 Gr.B square steel tube without verifying actual wall thickness against the declared tolerance band, the hidden cost shows up at customs, at the inspector’s gauge, or on the welding floor where fit-up gaps refuse to close. [NEED_CITE: EN 10219 dimensional tolerance requirements for cold-formed structural hollow sections]
How Sharp-Corner Rectangular Tube Geometry Meets Curtain Wall Framing Demands
Standard ERW rectangular tubes produce rounded corners with R≥2t, which creates visible gaps at mitered joints in glass curtain wall frames. The patented sharp-corner rectangular tube technology eliminates this mismatch, delivering right-angle edges that align flush with architectural glazing channels. For ASTM A500 Gr.B square steel tube orders destined for facade contractors across the EU and Middle East, this geometry difference determines whether the steel arrives as a structural component or as a liability requiring on-site grinding and re-welding.
Structural Code Compliance and Surface Protection for Outdoor Exposure
Load-bearing frames designed to EN 1993 or AISC specifications require consistent yield strength across every member, which means the mill test certificate must trace each piece back to its heat number. For outdoor solar structures and infrastructure posts, the surface treatment choice — pre-galvanized at 40–80g/m² for sheltered environments versus hot-dip galvanized at 200–600g/m² for coastal or industrial zones — directly controls the maintenance cycle over the structure’s design life. ASTM A500 Gr.B square steel tube supplied with CE marking per EN 10219/10210 clears EU customs without additional testing delays. [NEED_CITE: hot-dip galvanizing coating thickness standards for structural steel corrosion protection]
Decoding the Steel Grade Chain: Q355, S355JR, and A500 Gr.B
The Q-series (GB), S-series (EN), and ASTM A500 grade system all describe overlapping mechanical property ranges, but they are not interchangeable on paper. Q355 maps to S355JR under EN 10219, while A500 Gr.B sits closest to Q345 in yield behavior — yet the chemical composition limits differ, particularly for carbon and manganese content, which affects weldability. ERW welding produces a longitudinal seam that, when combined with proper post-weld heat treatment, delivers uniform grain structure across the cross-section. Wall thickness up to 20mm in the standard range — and up to 40mm through our heavy-wall production lines — covers everything from light gauge framing to primary column members. The ±1% dimensional tolerance holds across the full 20×20mm to 500×500mm square range.
The Hidden Price of Unverified Mill Certificates and Off-Standard Dimensions
Ordering ASTM A500 Gr.B square steel tube from a supplier who cannot produce EN 10204 3.1 mill test certificates means the material arrives at site without traceable chemistry or mechanical data — a condition that fails structural inspection under EN 10219 and AISC requirements. Non-standard dimensions sourced from mills that only produce popular sizes force fabricators into costly re-cutting and material waste. Missing CE marks on tubes destined for European markets trigger customs holds that delay projects by weeks, regardless of the actual steel quality. [NEED_CITE: ASTM A500 certification requirements for structural hollow section import compliance]
Why Project Procurement Teams Source ASTM A500 Gr.B Square Steel Tube Through Our Production Lines
Our facility operates three dedicated production lines covering 2,800+ specifications, with wall thickness capability reaching 40mm for heavy structural members. We hold 41 invention patents — including China’s original sharp-corner rectangular tube technology — which means facade contractors sourcing from us receive right-angle geometry that standard mills cannot produce. Every batch passes through our in-house physical and chemical laboratory before shipment, with dimensional checks, tensile testing, and chemical analysis documented in the mill test certificate. Full international certifications including ISO 9001:2015, Lloyd’s CE per EN 10210/10219, and Singapore FPC allow our ASTM A500 Gr.B square steel tube to clear customs across 50+ export markets. Custom non-standard sizes are available with low MOQ, and our professional container loading team uses anti-damage measures to prevent bending and surface scratches during ocean transit.
Documentation & Compliance
- Mill test certificate documenting ASTM A500 Gr.B chemical composition (carbon, manganese, phosphorus, sulfur) and yield strength per ASTM A500 / EN 10219
- CE certificate per EN 10210 and EN 10219 for European Union structural hollow section import compliance
- ISO 9001:2015 quality management system certificate covering the full production process from raw material to finished ASTM A500 Gr.B square steel tube
- SGS or BV third-party inspection report available upon request, covering dimensional verification, coating thickness measurement, and mechanical testing
- Material traceability by heat number stamped on each piece, linked to the corresponding mill test certificate
- Full customs documentation package including packing list, bill of lading, and certificate of origin for destination port clearance
Packaging, Loading & Delivery
- ASTM A500 Gr.B square steel tube bundled with steel strips and edge protectors to maintain bundle integrity during crane handling and container stuffing
- Pre-galvanized and hot-dip galvanized tubes wrapped with waterproof paper and plastic film to preserve the zinc coating from moisture exposure during ocean transit
- Container loading optimized by nesting square tubes within rectangular profiles to maximize 20ft and 40ft GP container payload for 3m–12m lengths
- Cut-to-order length service available for 500×500mm and larger sections, with cut faces deburred and marked with heat number and steel grade
- Each piece stenciled with steel grade (A500 Gr.B), size, wall thickness, and heat number for on-site identification and traceability
- Shipping terms FOB, CIF, and DDP available with professional tube and beam loading crew to prevent bending and surface damage
Ready to Lock In Your ASTM A500 Gr.B Square Steel Tube Specification
Submit your required dimensions, steel grade, surface treatment, quantity, and destination port to receive a detailed quotation with unit pricing, lead time, and shipping terms within 12 hours. Mill test certificates and third-party inspection reports are confirmed at the quotation stage so there are no documentation surprises at customs.
Request Your ASTM A500 Gr.B Square Steel Tube Quotation
Send your specification sheet to receive pricing, mill test certificate samples, and container loading plans.
Mobile/WhatsApp/WeChat: +86 188 5315 7756 | Email: admin@sdxjypipe.com | Website: www.sdxjypipe.com
Frequently Asked Questions
Q: How do Q235, Q345, S235JR, S355JR, and ASTM A500 Gr.B map to each other across different standards?
A: Q235 corresponds to S235JR under EN 10219 and is closest to A500 Gr.A in mechanical behavior. Q345 maps to S355JR and aligns with A500 Gr.B/Gr.C in yield strength range. The chemical composition limits differ slightly between GB, EN, and ASTM systems, particularly for carbon and manganese, which affects weldability — we provide full grade equivalence documentation with every quotation.
Q: Do your ASTM A500 Gr.B square steel tubes carry CE marking for European Union import clearance?
A: Yes. Our structural hollow sections carry Lloyd’s CE certification per EN 10210 and EN 10219, which satisfies EU Construction Products Regulation requirements for structural steel. The CE mark is documented on the mill test certificate and the export declaration.
Q: Can you produce non-standard dimensions outside the 20×20mm to 500×500mm range?
A: Custom non-standard sizes are available beyond the standard catalog range, with low MOQ requirements. Our production lines cover 2,800+ specifications including oversized sections and heavy wall thickness up to 40mm. Submit your drawing or dimension sheet for a feasibility check and lead time confirmation.
Q: What is the difference between pre-galvanized and hot-dip galvanized surface treatment for ASTM A500 Gr.B square steel tube?
A: Pre-galvanized coating at 40–80g/m² suits indoor or sheltered environments where corrosion exposure is limited. Hot-dip galvanized coating at 200–600g/m² provides significantly thicker zinc coverage for outdoor, coastal, or industrial environments. The choice depends on the project’s corrosion category and design life.
Q: How do you prevent tube damage during container loading and ocean freight?
A: We use dedicated loading crews trained in tube and beam handling. Square and rectangular tubes are bundled with steel strips and edge protectors, nested to fill container space efficiently, and secured with dunnage to prevent shifting. Galvanized surfaces receive additional waterproof wrapping. Loading photos are provided before the container is sealed.
