Description
Factory-Direct Galvanized SHS Supply — Integrated steel mill and fabrication workshop ensure full material traceability from raw Q235 billet to finished ASTM A500 Q235 galvanized square steel tube with Z30-Z180 coating.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | ASTM A500 Q235 Galvanized Square Hollow Section |
| Product Type | Galvanized Square Steel Tube / Square Hollow Section (SHS) |
| Steel Grade | Q235, Q235B, Q195, Q355, S275, S275JR, A53, ST37, SGCC, CGCC, DX51D |
| Standard | ASTM, API, BIS, CE, GS, ISO 9001, JIS, KS, PVOC, RoHS, SABS, Saso, SIRM, SNI, SONCAP, TISI |
| Section Shape | Square |
| Outer Diameter or Side Length | As per customer request |
| Wall Thickness | 1.2 – 20 mm |
| Length | 1 – 12 m or as customer request |
| Technique | Hot Rolled Based |
| Surface Treatment | Galvanized (Z30 – Z180) |
| Tolerance | ±1% |
| Ends | Plain |
| Application | Steel structures, Construction frames, Making pipes, Making fences, Making containers, Making corrugated sheets, Making small tools, Boiler pipe |
| MOQ | 15 Tons |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| EPC & Industrial Construction | Steel frame structures for factory buildings, warehouse support columns, equipment platforms |
| Infrastructure & Civil Works | Bridge handrails, highway sound barriers, lighting pole bases, utility racks |
| Commercial Building | Mezzanine floors, stairway stringers, curtain wall sub-frames |
| Agricultural & Storage | Grain silo frames, cold storage structural supports, livestock shelter frames |
| Container & Modular Build | Shipping container corner posts, modular house chassis, portable cabin frames |
Where Negative Tolerance Turns a 15-Ton Order into a Customs Rejection
Actual wall thickness below declared minimum triggers third-party inspection failure at destination port.
When overseas buyers source ASTM A500 Q235 galvanized square steel tube supplier from fragmented traders, the material traceability chain breaks at the mill level. A trader sources from multiple rolling mills without unified quality control — one batch meets ±1% tolerance, another stretches negative tolerance to the edge. The result: theoretical weight calculation diverges from actual weight by over a ton per container, and destination customs or client-appointed SGS inspectors reject the entire shipment. [NEED_CITE: EN 10219 dimensional tolerance requirements for cold-formed hollow sections]
How 1.2-20mm Thickness Range Covers Structural and Non-Structural SHS Demands
The ASTM A500 Q235 galvanized square steel tube spans from thin-wall 1.2mm sections for fence posts and corrugated sheet purlins, up to 20mm heavy-wall tubes for load-bearing columns and crane runway beams. Hot-rolled base material provides full-hard structural integrity across this range, while Z30-Z180 galvanizing coating selection matches environmental exposure — Z30 for indoor dry frames, Z180 for coastal industrial facilities or Middle East outdoor infrastructure. Our own steel mill produces the raw black SHS before galvanizing, eliminating the material certification gap that occurs when fabricators buy from third-party tube suppliers.
Structural Code Compliance and Certification Pathways for International Projects
Engineering specifications for steel frame structures typically reference EN 1993 (Eurocode 3) or AISC 360 for load-bearing hollow sections. ASTM A500 Q235 galvanized square steel tube meets ASTM A500 Grade B chemical and dimensional requirements, while Q355 and S275JR grades provide higher yield strength options for seismic zones or heavy-load platforms. For European market entry, CE certification per EN 10210 (hot-finished) or EN 10219 (cold-formed) is mandatory — our factory holds both certifications with full factory production control documentation. [NEED_CITE: CE marking requirements for structural hollow sections under EN 1090-2]
Steel Grade Selection: Q235 vs S275JR vs ASTM A500 Equivalence
Q235 (Chinese GB standard) and ASTM A500 Grade B share similar yield strength ranges around 235-250 MPa, making Q235 a cost-effective substitute for non-critical structural applications. S275JR (European EN standard) offers higher minimum yield strength at 275 MPa, required for engineered structures in EU markets where EN 10219 compliance is specified. The hot-rolled technique used for our SHS ensures uniform grain structure and weldability across all grades, while galvanizing with Z30-Z180 zinc coating provides corrosion protection proportional to environmental severity — indoor warehouse frames need minimal coating, while coastal port structures demand Z180 for 20-year service life. [NEED_CITE: steel grade equivalence tables between GB, ASTM, and EN standards]
The Hidden Cost of Unverified Wall Thickness in Project Procurement
Ordering ASTM A500 Q235 galvanized square steel tube supplier without mill test certificate traceability risks dimensional non-compliance that surfaces only during site installation. Negative tolerance beyond ±1% reduces actual load-bearing capacity — a 10mm declared wall measuring 8.5mm fails structural engineer approval, triggering rework, replacement orders, and project delay penalties. Certification gaps also block customs clearance in SONCAP-regulated markets (Nigeria) or SABS-required shipments (South Africa), leaving containers stranded at port with demurrage costs accumulating daily. [NEED_CITE: SONCAP certification requirements for steel imports into Nigeria]
Why Project Buyers Choose Integrated Mill-to-Fabrication Supply
Our Shandong facility operates three production lines for raw steel and maintains 2,800+ specifications in inventory, enabling single-source procurement from billet to finished galvanized SHS. Every ASTM A500 Q235 galvanized square steel tube carries heat number traceability back to our own rolling mill — no third-party material mixing, no certification chain breaks. Certified welding procedures (WPS/PQR) and qualified welders (AWS/EN certified) support custom fabrication if your project requires cutting, drilling, or welding before shipment. Complete quality documentation packages include mill test certificates, dimensional inspection reports, coating thickness measurements, and third-party inspection reports from SGS or BV upon request.
Documentation & Compliance
- Mill test certificate documenting Q235 chemical composition (C, Mn, Si, P, S) and yield/tensile strength per ASTM A500 or GB/T 700 standard
- CE certificate per EN 10210/EN 10219 for structural hollow sections entering European Union markets
- ISO 9001:2015 quality management system certificate covering steel production and galvanizing processes
- SGS or BV third-party inspection report verifying wall thickness, zinc coating weight (Z30-Z180), and dimensional tolerance
- Material traceability sheet linking each bundle to heat number, rolling date, and galvanizing batch
- Customs documentation including packing list, bill of lading, certificate of origin, and SONCAP/SABER/SASO certificates as required by destination country
Packaging, Loading & Delivery
- Galvanized square tubes bundled with high-tensile steel strips and edge protectors to preserve zinc coating during ocean transit and prevent corner damage
- Seaworthy packaging with waterproof paper wrapping for 1-12m lengths, suitable for container or breakbulk shipment
- Container loading optimization for 20ft and 40ft GP/OT containers, maximizing weight utilization for 15-ton MOQ orders
- Plain ends protected with plastic caps to prevent zinc spalling and moisture ingress during storage
- Heat number and steel grade stenciled on each bundle for site identification and inspection traceability
- FOB Qingdao/Tianjin port or CIF/DDP delivery to destination port with complete export documentation
How to Initiate Procurement for Your Next Structural Steel Package
Submit your project drawings (PDF/DWG), steel grade requirements (Q235/S275JR/ASTM A500), wall thickness range, and total tonnage to receive a detailed quotation within 24 hours. Our engineering team reviews shop drawings, confirms material availability from 2,800+ specifications in stock, and provides mill test certificate samples before contract signing. For projects requiring SONCAP, SASO, or SABER certification, we confirm documentation requirements and lead times before production begins.
Request Quotation with Mill Test Certificate
Share your ASTM A500 Q235 galvanized square steel tube specifications, quantity, and destination port — we respond with pricing, coating options (Z30-Z180), and certification pathway within one business day.
Contact: admin@xjystructure.com | WhatsApp: +86 188 5315 7756 | Website: www.xjystructure.com
