Description
Factory-Direct SHS Pricing, No Middlemen — Every ASTM A53 GRB square hollow section tube rolls off our own ERW and seamless lines in Jinan, cutting agent margins so project buyers pay true mill rates.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | ASTM A53 GRB Square Hollow Section Tube |
| Product Type | Square Hollow Section (SHS) Steel Tube |
| Steel Grade | Gr.B, S235, S275, S355, STK400 |
| Standard | ASTM A53, ASTM A500, GB/T 3091 |
| Section Shape | Square |
| Size Range | 19 mm × 19 mm – 800 mm × 800 mm |
| Wall Thickness | 1 – 30 mm |
| Length | 5.8 m / 6 m / 11.8 m / 12 m / Random Length |
| Technique | ERW Welded or Seamless |
| Surface Treatment | Black Painting / Galvanized / Varnish / Bare |
| Tolerance | ±1% |
| Ends | Plain |
| Application | Construction Structures / Building Frames / Curtain Walls / Support Tubes / Structural Pipe / Machinery Frames |
| MOQ | 5 Tons |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Commercial Construction | Column frames, roof trusses, mezzanine support beams |
| Industrial Infrastructure | Conveyor gantries, equipment bases, pipe rack structures |
| Architectural Facades | Curtain wall mullions, canopy supports, decorative structural elements |
| Machinery Manufacturing | Crane booms, hydraulic press frames, automated line supports |
What Negative Tolerance Costs on a Bulk SHS Frame Order
A ±1% wall-thickness tolerance keeps theoretical weight aligned with structural calculations — anything wider silently erodes load capacity and triggers third-party rejection.
On a recent Middle East high-rise project, a competitor’s batch of ASTM A53 GRB sections arrived with wall thickness running 8% below nominal. The client’s SGS inspector caught it during pre-erection checks. The entire container was rejected, returned to Jinan for re-rolling, and the project faced a six-week delay. That kind of failure does not show up in price comparisons — it surfaces at the construction site when welders notice fit-up gaps or when inspectors flag mill certificates that do not match physical measurements. [NEED_CITE: ASTM A53 dimensional tolerance requirements for structural hollow sections]
Matching SHS Dimensions to Structural Load Paths
An ASTM A53 GRB square hollow section tube from 19×19 mm up to 800×800 mm covers everything from light gauge curtain wall mullions to heavy column sections in industrial sheds. The 1–30 mm wall range lets engineers step up thickness at high-stress nodes without switching suppliers. For corrosive coastal or chemical plant environments, hot-dip galvanized finish protects the zinc layer through ocean transit and decades of service. Our production lines run ERW welded for standard structural frames where cost efficiency matters, and seamless for critical load points where internal pressure or dynamic cycling demands uniform grain structure.
Structural Code Compliance and Certification Pathways
Engineering specifications for SHS typically reference EN 1993-1-1 for Eurozone projects or AISC 360 for North American builds. ASTM A53 Gr.B meets the mechanical baseline for general structural use, while S355 steps into higher yield territory for long-span or heavily loaded frames. [NEED_CITE: EN 10219 cold-formed structural hollow section dimensional and tolerances] For EU-bound shipments, Lloyd’s CE certification under EN 10210 (hot-finished) or EN 10219 (cold-formed) is often a customs prerequisite — missing the Factory Production Control certificate means cargo sits at port. Our in-house lab runs three-stage inspection before dispatch, and SGS/BV third-party reports are available for clients who need independent verification for their project consultants.
Steel Grade Selection and Manufacturing Process Logic
The grade roster — Gr.B, S235, S275, S355, STK400 — spans three international systems. ASTM Gr.B and Chinese Q-series sit at the entry level for light structural work. EN S235 through S355 offer stepped yield strength increases, letting designers optimize section weight without oversizing. JIS STK400 serves Japanese-spec architectural frames. ERW welded tubes form from coil through continuous roll-forming and high-frequency welding — efficient for long runs of standard sizes. Seamless tubes pierce a solid billet, eliminating the weld seam entirely, which matters for thick-wall sections above 20 mm or applications involving vibration and fatigue. Surface treatment choice follows the environment: bare or black-painted for indoor or temporary structures, galvanized for outdoor exposure, varnished for aesthetic architectural work where the substrate needs light protection without hiding the steel texture.
Hidden Costs of Buying the Wrong Grade or Tolerance
Specifying S235 when the structural engineer calculated for S355 means the frame deflects beyond allowable limits — discovered only after erection begins. Shipping without proper CE documentation halts customs clearance in Rotterdam or Hamburg for days, racking up demurrage charges that dwarf the tube price difference. Accepting wall thickness below the ±1% tolerance to save a few dollars per ton shifts the real cost to the site: re-welding, re-drilling, or in worst cases, cutting out and replacing entire bay sections. [NEED_CITE: consequences of steel material non-compliance in structural construction]
Why Project Buyers Source ASTM A53 GRB SHS Through Xin Jiyuan
Our Jinan facility runs three simultaneous production lines, holding 2,800+ specifications in ready stock so standard sizes ship within days rather than weeks. Factory-direct pricing means no trading company markup — volume buyers locking annual commitments get tiered discounts reviewed every six months. Every heat number traces back to the original slab, with mill test certificates documenting chemical composition and mechanical properties for each batch. Lloyd’s CE certification under EN 10210 and EN 10219 covers both hot-finished and cold-formed routes, while ISO 9001:2015 governs the entire quality management system. For non-standard sizes or unusual lengths, our flexible MOQ starts at 5 tons — enough for trial orders without committing to full-container quantities. Our export team handles container loading optimization, stacking heavy-wall sections to maximize payload while protecting surface finish during ocean transit.
Documentation & Compliance
- Mill test certificate documenting Gr.B chemical composition and mechanical properties per ASTM A53, with heat number traceability to the original slab
- Lloyd’s CE certificate under EN 10210 for hot-finished or EN 10219 for cold-formed ASTM A53 GRB square hollow section tubes, required for EU customs clearance
- ISO 9001:2015 quality management certificate covering the full production and inspection workflow
- SGS or BV third-party inspection report available on request for clients requiring independent verification before shipment
- Material traceability documentation linking each bundle to its heat number, steel grade, and dimensional inspection results
- Full customs document package including packing list, bill of lading, and certificate of origin formatted for the destination port
Packaging, Loading & Delivery
- ASTM A53 GRB SHS tubes bundled with high-tensile steel strips, seaworthy packaged for ocean container shipment with edge protectors on galvanized finishes to prevent zinc coating damage
- Black-painted or varnished surfaces wrapped in waterproof paper before bundling to prevent moisture staining during transit and yard storage
- Container loading plans optimized for 5.8 m and 6 m lengths to maximize 20ft and 40ft GP payload, with 11.8 m and 12 m sections loaded on flat racks or open-top containers
- Random length or cut-to-order lengths available for 19×19 mm through 200×200 mm small sections, reducing on-site waste for curtain wall and machinery frame applications
- Each bundle tagged with heat number, steel grade (Gr.B / S235 / S355), size, and length for immediate site identification and mill certificate cross-referencing
- FOB Jinan/Qingdao, CIF destination port, or DDP door-to-door logistics coordinated by our export team with real-time container tracking
Getting Your ASTM A53 GRB SHS Quote Moving
Send your specification list — sizes, wall thickness, steel grade, surface treatment, quantity, and destination port — and we respond within 12 hours with bulk pricing, mill test certificate samples, and estimated production lead time. For non-standard dimensions or mixed-container orders combining SHS with round pipe or section steel, our team consolidates everything into optimized loading plans. Confirm your certification requirements up front so we prepare CE, ISO, or third-party inspection documents before the cargo reaches the port.
Frequently Asked Questions
Q: How do ASTM A53 Gr.B, S235, and S355 compare for structural hollow section use?
A: Gr.B and S235 sit at similar yield strength levels suitable for light to medium structural frames. S355 offers higher yield strength for long-span or heavily loaded applications, allowing thinner walls for the same load capacity. All three grades are available in our ASTM A53 GRB square hollow section tube range with full mill test certificates documenting chemical and mechanical properties.
Q: Can you supply non-standard SHS sizes with low MOQ for trial orders?
A: Yes. Our 2,800+ specification inventory covers standard sizes from 19×19 mm to 800×800 mm in 1–30 mm wall thickness. For non-standard dimensions or unusual lengths, our flexible MOQ starts at 5 tons, enough for trial orders or small project batches without requiring full-container commitment.
Q: What is the difference between ERW welded and seamless square tubes for structural use?
A: ERW welded tubes form from coil through continuous roll-forming and high-frequency welding, offering cost efficiency for standard structural frames. Seamless tubes pierce a solid billet with no weld seam, preferred for thick-wall sections above 20 mm or applications involving vibration, fatigue, or internal pressure where uniform grain structure matters.
Q: How do you guarantee material traceability and certificate authenticity for customs clearance?
A: Every batch carries an original mill test certificate linking the heat number to chemical composition and mechanical properties per ASTM A53. Our Lloyd’s CE certification under EN 10210/EN 10219 satisfies EU customs requirements. SGS or BV third-party inspection is available for clients needing independent verification.
Q: What surface treatment options are available for outdoor or corrosive environments?
A: Hot-dip galvanized finish provides long-term corrosion protection for outdoor structural frames, coastal installations, and chemical plant supports. Black painting or varnish suits indoor or temporary structures where appearance matters. Bare or oiled finish works for sections that will receive site-applied coating systems as part of the project specification.
[Request Your ASTM A53 GRB SHS Mill Quote Today]
Submit your size list, steel grade, quantity, and destination port to receive competitive factory-direct pricing with mill test certificates within 12 hours.
Company: Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@sdxinjiyuan.com
