Description
Factory-direct square tubes, zero middlemen — XJY Structure owns the steel mill producing 2,800+ raw material specs and runs the fabrication workshop under one roof, so every ASTM A500 square steel tube ships with full material traceability from melt to container.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | ASTM A500 Square Steel Tube |
| Product Type | Square Hollow Section (SHS) Welded Steel Tube |
| Steel Grade | Gr.B, S235, S275, S355, STK400, Q235B |
| Standard | ASTM A500, ASTM A53, GB/T 3091 |
| Section Shape | Square |
| Size Range | 19mm × 19mm – 800mm × 800mm |
| Wall Thickness | 1 – 30 mm |
| Length | 5.8m / 6m / 11.8m / 12m / Random Length |
| Technique | ERW Welded / Seamless |
| Surface Treatment | Black Painting / Galvanized / Varnish / Bare |
| Tolerance | ±1% |
| Ends | Plain |
| Application | Construction structures / Building frames / Curtain wall supports / Structural pipe / Machinery frames / Scaffolding |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Commercial Construction | Building frames, column grids, roof trusses for warehouses and retail centers |
| Industrial Facilities | Machinery bases, equipment support platforms, conveyor structure frames |
| Architectural Engineering | Curtain wall support systems, façade structural frames, canopy columns |
| Infrastructure & Scaffolding | Scaffolding uprights, temporary access structures, bridge formwork supports |
What Wall-Thickness Tolerance Costs on a Structural Frame Order
A ±1% tolerance on a 30mm-wall ASTM A500 square steel tube keeps bolt-hole alignment and moment connections within engineering limits.
When overseas buyers source square hollow sections without verified dimensional control, the hidden risk is not the tube itself — it is the cumulative stack-up at every connection point. A column base plate designed for a 200×200mm SHS with 10mm wall becomes a field rework nightmare if the actual section arrives 3mm undersize. Weld prep bevels no longer match, gusset plates do not seat flush, and the structural engineer must either approve a deviation or halt erection. [NEED_CITE: dimensional tolerance requirements for structural hollow sections per EN 10219]
How SHS Dimensions Match Structural Connection Details
Square hollow sections from 19×19mm up to 800×800mm cover the full spectrum from light curtain-wall purlins to heavy industrial column bases. The flat face of an ASTM A500 square steel tube allows direct bearing contact with gusset plates and end plates — no rotational orientation guesswork during erection. For our Middle East warehouse projects, we supply 200×200mm to 400×400mm sections in S355 with ±1% tolerance, pre-drilled per approved shop drawings so the steel arrives site-ready.
Structural Code Compliance and Surface Protection Selection
Engineering specifications for steel frames typically reference EN 1993 or AISC design codes, which require verified material properties and documented fabrication quality. An ASTM A500 square steel tube in Gr.B meets North American structural requirements, while S355 covers European and Australian projects under EN 10219. For corrosive environments — coastal warehouses, chemical plants, agricultural buildings — hot-dip galvanizing extends service life without field painting. Black painted or bare finishes suit interior, climate-controlled applications where appearance is secondary to structural function. [NEED_CITE: ASTM A500 vs EN 10219 structural hollow section compliance]
Steel Grade Selection and Production Route Logic
The jump from S235 to S275 to S355 represents increasing minimum yield strength — each step allows thinner walls for the same load, reducing self-weight and foundation costs. ASTM A500 Gr.B sits in the same performance band as S235, while Q235B serves domestic-standard projects at competitive pricing. ERW welded tubes offer cost efficiency for standard structural applications up to 30mm wall, while seamless production handles high-stress connections and critical load paths where weld-line integrity is non-negotiable. Surface treatment choice — galvanized for exterior exposure, black painted for interior, bare for shop-primed projects — is decided during the quotation stage based on the project’s corrosion category.
The Hidden Price of Unverified Material Certification
An ASTM A500 square steel tube shipped without a valid mill test certificate is not a cheaper tube — it is an uninsurable liability. Customs authorities in the EU and Middle East routinely hold hollow sections lacking EN 10204 3.1 documentation, causing demurrage costs that erase any material savings. On site, the structural engineer cannot sign off on connections without verified chemistry and mechanical test data. The rework cycle — re-testing, re-certification, or outright replacement — typically costs multiples of the original price difference between a verified supplier and an unverified one. [NEED_CITE: EN 10204 inspection document types for steel products]
Why Project Teams Specify XJY Structure for SHS Supply
We operate the steel mill producing the raw coil and plate, then fabricate the finished square tubes in our own workshop — no trading company markup, no third-party material sourcing gaps. Our in-house laboratory issues mill test certificates for every heat number, covering chemical composition and mechanical properties per ASTM A500, EN 10219, or GB/T 3091 as specified. The 2,800+ raw material specs in our inventory mean we pull from stock rather than waiting for mill rolling schedules, compressing lead times for urgent project phases. Third-party inspection through SGS or BV is arranged before container loading, and our loading engineers plan container stowage to maximize payload for 6m and 12m lengths while protecting surface finishes.
Documentation & Compliance
- Mill test certificate per EN 10204 3.1 documenting Gr.B chemical composition and mechanical properties per ASTM A500
- CE marking certificate confirming EN 10219 compliance for S355 square hollow sections shipped to EU markets
- ISO 9001 quality management certificate covering the integrated steelmaking and fabrication process
- SGS or BV third-party inspection report verifying dimensional tolerance and surface coating thickness
- Full material traceability by heat number from raw coil to finished ASTM A500 square steel tube
- Export customs documentation including packing list, bill of lading, and certificate of origin
Packaging, Loading & Delivery
- ERW welded square tubes bundled with galvanized steel strips, separated by rubber pads to prevent coating damage during ocean transit
- Galvanized ASTM A500 square steel tubes wrapped with waterproof cloth and edge protectors to preserve zinc layer integrity
- 6m and 12m lengths loaded in 20ft and 40ft containers with optimized stowage plans maximizing payload per shipment
- Custom cut-to-length service available for random-length orders, with cut ends deburred and protected against corrosion
- Heat number and steel grade stenciled on each bundle for site identification and traceability verification
- FOB, CIF, and DDP shipping terms available with door-to-door logistics coordination to project site
How to Initiate a Structural Steel Tube Inquiry
Share your project drawings in PDF or DWG format along with the required steel grade, section dimensions, wall thickness, surface treatment, and destination port. We respond within one day with a detailed quotation including material cost, fabrication charges, coating fees, and ocean freight estimates — plus a mill test certificate template for your engineer’s review.
Request Your ASTM A500 Square Steel Tube Quotation
Submit your specifications and receive a detailed offer with mill test certificates within 24 hours.
Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Website: www.xjystructure.com
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@xjystructure.com
Address: No.11889, Jingshi West Road, Lulian Group, Jinan City, Shandong Province, China
Frequently Asked Questions
Q: What is the difference between ASTM A500 Gr.B and EN S355JR for square hollow sections?
A: ASTM A500 Gr.B and EN S355JR belong to different standard systems but serve similar structural functions. Gr.B is the North American specification with minimum yield strength suitable for general construction, while S355JR is the European standard offering higher yield strength for heavier load applications. We supply both grades from the same integrated production line with full mill test certificates for each standard.
Q: Can you provide third-party inspection for ASTM A500 square steel tube shipments?
A: Yes. We arrange SGS, BV, or client-nominated surveyor inspection at our facility before container loading. The inspection covers dimensional verification, surface coating thickness measurement, visual weld quality, and mill test certificate review. The inspection report is issued alongside our internal quality documentation for customs and site acceptance.
Q: Do you offer custom cutting, drilling, and fabrication beyond standard tube supply?
A: Yes. Our fabrication workshop provides CNC cutting, drilling, welding, and assembly services per approved shop drawings. We can deliver ASTM A500 square steel tubes cut to exact project lengths, with pre-drilled connection holes, welded base plates, or fully assembled column sections ready for site erection.
Q: What surface treatment options are available for different project environments?
A: We offer black painting for interior structural applications, hot-dip galvanizing for exterior or corrosive environments, varnish coating for temporary protection during transit, and bare finish for projects where the client handles field painting. The surface treatment is selected during quotation based on the project’s corrosion category and specification requirements.
Q: How do you optimize container loading for oversized square tubes?
A: Our loading engineers prepare stowage plans for each shipment, nesting smaller sections inside larger ones where possible and positioning heavy-wall tubes to maximize container payload. For 12m lengths, we use 40ft high-cube containers with specialized lashing to prevent movement during ocean transit, reducing shipping cost per ton.
Start Your ASTM A500 Square Steel Tube Order Today
Send your project drawings and specifications to receive a complete quotation with mill test certificates and delivery schedule.
Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Website: www.xjystructure.com
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@xjystructure.com
