Description
Factory-Direct Galvanized SHS/RHS Supply — Hot-dip galvanized square and rectangular steel tubes produced in-house to ASTM A53 and ASTM A500, shipped with full mill test certificates and third-party verified coating thickness.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Galvanized Square and Rectangular Steel Tube |
| Product Type | Hot-Dip Galvanized SHS / RHS |
| Steel Grade | A53 Grade B, A500 Grade A/B/C, STK400, SS400, ST42.2, S355JR |
| Standard | ASTM A53, ASTM A500, ASTM A36, ASTM A795, BS 1387, EN 10255, ISO 65, ANSI C80, DIN 2440, JIS G3444, GB/T 3091, GB/T 13793 |
| Section Shape | Square / Rectangular |
| Size Range | 21.3 mm – 660 mm (1/2″ – 26″) |
| Wall Thickness | 6 mm |
| Length | 5.8 m / 6 m / 11 m or customized |
| Technique | ERW Welded + Hot-Dip Galvanizing |
| Surface Treatment | Hot-Dip Galvanized |
| Ends | Plain ends / Beveled ends / Threaded ends / Grooved ends |
| Tolerance | ±1% / ±5% |
| Processing Service | Punching / Cutting / Bending |
| Application | Structural frames, scaffolding, fluid transmission, construction, machinery |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Municipal Infrastructure | Water and gas transmission pipelines, underground utility conduits |
| Construction & Steel Structure | Building frames, column supports, roof trusses, scaffolding systems |
| Precision Machinery | Hydraulic cylinder housings, conveyor structures, equipment frames |
| Power & Petrochemical | Cable support structures, pipe racks, boiler supports |
| Building Industry | Curtain wall framing, facade supports, architectural structural members |
Coating Thickness Is Where Galvanized Tube Orders Fail Inspection
A 20-micron gap between contract spec and actual coating turns a delivered shipment into a warehouse rejection.
Procurement teams ordering hot-dip galvanized square and rectangular steel tubes for municipal or structural projects frequently discover coating thickness shortfalls only after third-party inspection at the destination port. The root cause is rarely malicious — it is usually inconsistent bath temperature control, insufficient immersion time, or pre-galvanized material mislabeled as hot-dip. For projects governed by ASTM A123 or EN ISO 1461, coating thickness below the specified minimum triggers full batch rejection, and返工 costs at an overseas port often exceed the original cargo value. [NEED_CITE: hot-dip galvanizing coating thickness requirements per ASTM A123]
Matching Galvanized SHS/RHS to Structural and Fluid Transmission Projects
Hot-dip galvanized square and rectangular steel tubes in ASTM A500 Grade B and A53 Grade B serve dual roles — structural load-bearing members and corrosion-resistant fluid conduits. The zinc coating formed during hot-dip galvanizing provides metallurgical bonding to the steel substrate, delivering long-term corrosion protection for outdoor structural frames, scaffolding, and buried water or gas pipelines. For projects requiring on-site modification, our tubes arrive with processing services including cutting, punching, and bending completed at the factory, reducing field fabrication time and preserving coating integrity at cut points through cold-zinc touch-up application.
Engineering Compliance and Certification Requirements
Structural applications demand dimensional accuracy and verified mechanical properties. Galvanized SHS/RHS produced to ASTM A500 and EN 10219 must meet strict tolerance requirements for out-of-square, straightness, and wall thickness — deviations affect connection fit-up and load distribution in steel frames. For EU market projects, CE certification under EN 10210/EN 10219 is mandatory for customs clearance; without valid Declaration of Performance documentation, shipments are held at port. [NEED_CITE: EN 10219 cold-formed structural hollow section compliance requirements] Our in-house physical and chemical laboratory tests every production batch for dimensional accuracy, mechanical properties, and zinc coating thickness before release, with results documented in mill test certificates conforming to EN 10204 3.1 format.
Steel Grade Selection and Hot-Dip Galvanizing Process
ASTM A500 Grade B provides minimum yield strength suitable for general structural framing, while Grade C offers higher strength for heavy-load applications. S355JR, commonly specified in European projects, delivers higher yield strength than A500 Grade B and is preferred for bridges and industrial platforms. The hot-dip galvanizing process involves immersing cleaned steel tubes in molten zinc bath at approximately 450°C, forming a series of zinc-iron alloy layers that provide both barrier protection and cathodic protection. Wall thickness tolerance directly affects theoretical weight calculation — negative tolerance beyond standard limits reduces actual load-bearing capacity while the buyer pays for nominal weight. [NEED_CITE: steel grade equivalence between ASTM A500 and EN 10210 standards]
Hidden Costs of Incorrect Material Specification
Ordering galvanized SHS/RHS without verified coating thickness or proper material certification creates compounding costs. Coating below specification fails corrosion resistance requirements, leading to premature rust and structural degradation in outdoor or underground applications. Material grade mismatch — such as receiving A53 instead of A500 Grade B — fails structural engineering calculations and requires complete replacement. Missing CE documentation blocks EU customs clearance, incurring storage fees and project delays. [NEED_CITE: consequences of non-compliant steel tube imports in regulated markets]
Procurement Confidence Through Verified Production Control
Every Galvanized Square and Rectangular Steel Tube leaving our facility passes through three quality gates: in-house laboratory testing for coating thickness and mechanical properties, dimensional verification against ASTM A500 tolerance requirements, and pre-shipment documentation review. Our 2,800+ specification range covers side lengths from 21.3 mm to 660 mm with wall thickness up to 6 mm, eliminating the need for multi-supplier sourcing. Full international certifications — ISO 9001:2015, Lloyd’s CE (EN 10210/10219), Singapore FPC, and SGS/BV third-party verification — ensure compliance across 50+ export markets. Professional container loading with anti-damage measures prevents zinc coating scratches and tube deformation during ocean transit.
Documentation & Compliance
- Mill test certificate documenting A500 Grade B chemical composition and yield strength per ASTM A500, including hot-dip galvanizing coating thickness measurement results
- CE certificate confirming EN 10210/EN 10219 compliance for structural hollow sections exported to European Union markets
- ISO 9001:2015 quality management system certificate covering hot-dip galvanizing production and inspection processes
- SGS or BV third-party inspection report verifying coating thickness, dimensional tolerance, and surface quality before container loading
- Material traceability documentation linking each bundle to heat number and production batch for project audit requirements
- Complete customs documentation including packing list, bill of lading, and certificate of origin for destination port clearance
Packaging, Loading & Delivery
- Galvanized tubes bundled with steel strips and edge protectors to preserve zinc coating integrity during handling and ocean transit
- Plastic end caps installed on all tube ends to prevent moisture ingress and internal corrosion for A53/A500 grade fluid transmission applications
- Container loading optimized for 5.8 m and 6 m lengths with anti-shift bracing, maximizing payload while preventing surface damage to hot-dip galvanized finish
- Custom cutting to project-specific lengths available before galvanizing, reducing on-site waste for scaffolding and structural frame applications
- Heat number and steel grade markings applied to each tube for site identification and material traceability verification
- FOB, CIF, and DDP shipping terms available with professional export packing meeting seaworthy transportation standards
Request Quotation with Verified Mill Test Certificates
Submit your Galvanized Square and Rectangular Steel Tube requirements including section dimensions, wall thickness, steel grade (A500 Grade B, A53 Grade B, or S355JR), total quantity, and destination port. We respond within 12 hours with detailed pricing, production lead time, and available mill test certificate samples. Third-party inspection by SGS or BV can be arranged before loading for projects requiring independent quality verification.
Frequently Asked Questions
Q: What is the difference between hot-dip galvanized and pre-galvanized square tubes?
A: Hot-dip galvanizing immerses finished tubes in molten zinc, creating metallurgical bonding with coating thickness typically exceeding 65 microns. Pre-galvanized tubes are made from pre-coated steel sheets, resulting in thinner zinc layers at weld zones. For outdoor structural and underground fluid transmission applications, hot-dip galvanizing provides superior long-term corrosion protection.
Q: Can you provide ASTM A500 and EN 10210 equivalent grade tubes?
A: Yes. We produce galvanized SHS/RHS to both ASTM A500 (Grades A/B/C) and EN 10210 (S235JR/S275JR/S355JR) standards. Our technical team provides grade equivalence documentation to support your project specification and customs clearance requirements.
Q: What coating thickness can you guarantee for hot-dip galvanized tubes?
A: Our hot-dip galvanizing process produces coating thickness meeting or exceeding ASTM A123 and EN ISO 1461 minimum requirements. Every batch is tested in our in-house laboratory, and coating thickness results are documented in the mill test certificate provided with each shipment.
Q: Do you offer custom sizes beyond standard specifications?
A: Yes. Beyond our standard range of 21.3 mm to 660 mm side lengths, we produce custom non-standard sizes with low MOQ requirements. Custom lengths, wall thicknesses, and end treatments (beveled, threaded, grooved) are available for project-specific requirements.
Q: What certifications do you provide for EU market imports?
A: We hold Lloyd’s CE certification for EN 10210 and EN 10219 structural hollow sections, ISO 9001:2015 quality certification, and Singapore FPC certification. Complete documentation including Declaration of Performance, mill test certificates, and third-party inspection reports are provided for EU customs clearance.
Request Galvanized SHS/RHS Pricing with Full Certification Package
Send your specifications including dimensions, steel grade, quantity, and destination to receive detailed quotation and mill test certificate samples within 12 hours.
Contact: Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@sdxjypipe.com
Website: www.sdxjypipe.com
