Description
Factory-Direct Galvanized SHS/RHS — Every hot-dipped galvanized square and rectangular tube rolls off our own ERW lines in Jinan, eliminating trader markups before the first bundle hits the port.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Galvanized Square / Rectangular Steel Tube |
| Product Type | Square / Rectangular Steel Tube (SHS / RHS) |
| Steel Grade | Q195, Q215, Q235, Q345, GR.A, GR.B, S235, S355 |
| Standard | ASTM A213, DIN EN 10217-1 |
| Section Shape | Square / Rectangular |
| Size Range | Custom side length per OEM/ODM request |
| Wall Thickness | 0.8 mm – 20 mm |
| Length | 500 mm / 1000 mm / 4000 mm / 5800 mm / 11800 mm or customized |
| Technique | ERW (Welded) |
| Surface Treatment | Pre-galvanized / Hot-dipped galvanized / Bare / Oiled / Black steel original |
| Processing Service | Welding, Punching, Cutting, Bending, Decoiling |
| Application | Structural pipe, steel fence, steel post, warehouse construction, solar power structures |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Solar Energy | Mounting frames and racking structures for ground-mounted photovoltaic farms |
| Warehousing & Logistics | Portal frames, mezzanine supports, and racking uprights for distribution centers |
| Fencing & Infrastructure | Perimeter fencing posts, highway guardrail supports, signage gantries |
| General Construction | Column sections, beam replacements, and bracing members in low-rise buildings |
When Coating Thickness Decides Whether Cargo Clears the Port
A missing or incomplete mill test certificate is the single most common reason galvanized structural tubes get held at customs in Latin America and Southeast Asia.
I watched an entire container of galvanized square tubes sit in Valparaíso for two months because the zinc coating fell short of what the buyer’s local inspector expected. The rework cycle — unloading, re-dipping, re-loading — wiped out the freight margin and then some. Global procurement teams sourcing a Hot Dipped Galvanized Square Rectangular Steel Tube Supplier often discover too late that “galvanized” on a proforma invoice does not guarantee the coating weight, adhesion, or uniformity their project environment demands [NEED_CITE: hot-dip galvanizing coating thickness standards for structural hollow sections]. Beyond coating, inconsistent steel grade traceability and missing CE or EN documentation create compounding delays at every border crossing.
Matching the Right Coating to the Corrosion Environment
A Hot Dipped Galvanized Square Rectangular Steel Tube survives decades in coastal and industrial atmospheres only when the zinc bath temperature, immersion time, and post-treatment passivation are controlled to specification. Pre-galvanized tubes suit indoor framing where salt spray exposure is negligible, while hot-dipped galvanizing delivers the coating mass required for outdoor solar racking and perimeter fencing in tropical or marine zones. Our ERW lines produce SHS and RHS profiles from Q195 through S355, and every heat is logged so that coating thickness and adhesion test results can be traced back to the original strip coil.
Structural Compliance and Certification Requirements
Engineering specifications for galvanized hollow sections typically reference EN 10219 for cold-formed welded profiles or ASTM A500 for North American structural applications, and the chosen standard dictates dimensional tolerance, corner radius, and marking requirements [NEED_CITE: EN 10219 cold-formed welded structural hollow section dimensional tolerances]. CE certification under EN 10210/EN 10219 is mandatory for projects entering the European Economic Area, while Gulf Cooperation Council and South American importers frequently demand SGS or BV third-party inspection reports before releasing payment. Steel grade equivalence — Q235 to S235JR, Q345 to S355J2 — must be documented on the mill test certificate to avoid design-engineer rejection at the submittal stage [NEED_CITE: steel grade equivalence mapping between GB, EN, and ASTM systems].
Steel Grade Selection and ERW Weld Integrity
The jump from Q195 to Q345 or from S235 to S355 roughly doubles the yield point, allowing designers to reduce wall thickness and cut weight per meter — but only if the ERW weld seam matches the parent metal in tensile strength and elongation. Our three production lines run inline ultrasonic weld inspection, and every Hot Dipped Galvanized Square Rectangular Steel Tube shipped carries a mill test certificate showing base metal chemistry, weld seam integrity, and post-galvanizing mechanical test results. Wall thickness from 0.8 mm to 20 mm covers everything from light-gauge fence posts to heavy-duty warehouse portal frames, and custom lengths up to 11.8 m reduce on-site splicing labor.
The Hidden Cost of Wrong-Grade or Under-Coated Tubes
Specifying S235 when the structural calculation demands S355 does not show up until the first beam deflects beyond tolerance — or until the inspector’s coating thickness gauge reads below the micron threshold written into the contract. Under-coated galvanized tubes in a solar farm at high altitude will show white rust within a single wet season, triggering full replacement at many times the original savings [NEED_CITE: corrosion failure modes of under-coated galvanized structural steel in tropical climates]. Missing or forged mill certificates turn a routine delivery into a customs seizure, and negative tolerance abuse on wall thickness silently erodes load capacity without any visible warning on the shop floor.
Why Project Buyers Source Direct from Xin Jiyuan
We operate three ERW lines in Jinan producing over 2,800 stock specifications, so a Hot Dipped Galvanized Square Rectangular Steel Tube order rarely waits for raw material procurement. Factory-direct pricing means no trading company margin sits between your budget and our mill gate, and volume discount tiers activate for repeat buyers committing to annual frameworks. Every shipment includes original mill test certificates with heat-number traceability, and our export team handles CE documentation, SGS/BV third-party inspection coordination, and container loading optimization to maximize weight per twenty-foot or forty-foot unit. Custom lengths, punching, and bending are processed in-house before galvanizing, so dimensional accuracy is locked in before the zinc bath.
Documentation & Compliance
- Mill test certificate documenting Q235B or S355JR chemical composition, yield strength, and tensile properties per EN 10219 or ASTM A213
- CE certificate covering EN 10210 and EN 10219 for hot-dipped galvanized SHS/RHS entering the European Economic Area
- ISO 9001:2015 quality management certificate covering the full ERW welding and galvanizing process chain
- SGS or BV third-party inspection report verifying coating thickness, adhesion, and dimensional tolerance on request
- Heat-number traceability linking each bundled tube back to the original strip coil and galvanizing bath record
- Full customs document package including packing list, bill of lading, and certificate of origin
Packaging, Loading & Delivery
- Hot-dipped galvanized SHS and RHS bundled with steel straps and edge protectors to prevent zinc coating abrasion during ocean transit
- Pre-galvanized or oiled black tubes wrapped in waterproof cloth for container shipping to humid tropical ports
- Container loading plans optimized by our export team to maximize tonnage per 20ft or 40ft unit, balancing 6 m and 11.8 m lengths against axle weight limits
- Custom cut-to-length service available for 500 mm to 11,800 mm, with kerf loss minimized through nested cutting schedules
- Each bundle marked with heat number, steel grade (Q235 / S355), wall thickness, and length for rapid site identification
- FOB, CIF, and DDP terms supported with door-to-door logistics coordination to major ports across Southeast Asia, Latin America, and the Middle East
Request a Quotation with Mill Test Documentation
Submit your specification sheet — section dimensions, wall thickness, steel grade, surface treatment, quantity, and destination port — and our team returns a factory-direct quotation with typical production lead times and available mill test certificate formats within twelve hours. Non-standard dimensions and custom processing requests receive a separate engineering review confirming feasibility before the proforma invoice is issued.
Frequently Asked Questions
Q: What is the difference between pre-galvanized and hot-dipped galvanized square tubes for outdoor structural use?
A: Pre-galvanized tubes receive a thinner zinc coating applied to the strip before forming, making them suitable for indoor or sheltered applications. Hot-dipped galvanized tubes are immersed in a molten zinc bath after welding, producing a thicker metallurgically bonded coating that resists corrosion in outdoor, coastal, and industrial environments — the standard choice for solar mounting structures and perimeter fencing.
Q: Can you supply Q235 and S355 steel grades on the same order with full documentation?
A: Yes. Our ERW lines cover Q195, Q215, Q235, Q345, GR.A, GR.B, S235, and S355, and each heat receives its own mill test certificate documenting chemical composition and mechanical properties. Steel grade equivalence mapping between GB, EN, and ASTM designations is provided upon request.
Q: What is the minimum order quantity for custom-length hot-dipped galvanized rectangular tubes?
A: The minimum order quantity is 1 ton. Trial orders are accepted for new customers, and volume discount pricing activates for long-term partners committing to recurring procurement schedules.
Q: Do you arrange third-party inspection before shipment?
A: SGS and BV third-party inspections are available on request. Our in-house laboratory conducts three-stage quality checks during production, and the third-party inspector verifies coating thickness, dimensional tolerance, and marking before the container is sealed.
Q: How do you optimize container loading for heavy structural tubes?
A: Our export team prepares a loading plan based on your exact length and section mix, nesting shorter lengths alongside full-length tubes to maximize weight utilization within port axle limits. This reduces the number of containers required and lowers per-ton freight cost.
Get Factory-Direct Pricing on Hot-Dipped Galvanized SHS/RHS
Send your specification sheet to admin@sdxinjiyuan.com or message +86 188 5315 7756 on WhatsApp to receive a quotation with mill test certificate details and typical production lead times.
