Description
Factory-Direct Pricing, No Middlemen — every ASTM A500 square and rectangular steel tube rolls off our own ERW and seamless lines in Jinan, cutting agent markups before your project budget absorbs them.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | ASTM A500 Square and Rectangular Steel Tube |
| Product Type | Square and Rectangular Steel Tube (Welded / Seamless) |
| Steel Grade | ASTM A500 Gr.B, S235, S275, S355, STK400, Q235B, Q345B |
| Standard | ASTM A500, ASTM A53, GB/T 3091, EN 10219, EN 10210 |
| Section Shape | Square / Rectangular |
| Size Range | 19mm×19mm – 800mm×800mm |
| Wall Thickness | 1 – 30 mm |
| Length | 5.8m / 6m / 11.8m / 12m / Random Length / SRL / DRL |
| Technique | ERW Welded / Seamless |
| Surface Treatment | Black Painting / Galvanized / Varnish / Bare |
| Tolerance | ±1% |
| Ends | Plain |
| Application | Steel structures / Construction frames / Curtain wall / Support tubes / Building structures / Machinery frames |
| MOQ | 5 Tons |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Construction & Infrastructure | Building frames, curtain wall support columns, portal frame purlins, warehouse roof trusses |
| Industrial & Machinery | Equipment base frames, conveyor support structures, crane boom sections, machine guard rails |
| EPC Project Procurement | Multi-spec consolidated container loading for large-scale commercial and industrial developments |
What Wall-Thickness Tolerance Costs on a Structural Frame Order
A ±1% tolerance on an ASTM A500 square and rectangular steel tube means the difference between passing a load inspection and scrapping an entire container at the port.
I watched a 20-container shipment of 150×150×6 tubes get rejected at a Middle East project site because the wall measured 5.2mm instead of 6mm — the supplier had pushed negative tolerance to the edge, and the weight shortfall alone triggered a full batch refusal. [NEED_CITE: EN 10219 cold-formed hollow section dimensional tolerance requirements] When you source structural hollow sections from fragmented suppliers, you inherit their tolerance habits, and no amount of email correspondence fixes a container already sitting at the destination terminal. Quality uncertainty in wall thickness, unclear grade traceability, and missing independent verification remain the top reasons global buyers delay procurement decisions.
How Section Geometry Matches Structural Load Paths
The 19×19mm to 800×800mm size range of our ASTM A500 square and rectangular steel tube covers everything from light-gauge curtain wall mullions to heavy portal frame columns. Square sections distribute compressive loads equally on both axes, making them the default choice for freestanding columns, while rectangular tubes offer higher moment of inertia on the strong axis — ideal for beam applications where depth matters more than width. Our production lines run both ERW welded and seamless processes, so you get cost-efficient welded sections for standard framing and seamless options where internal pressure or critical structural integrity demands it.
Engineering Compliance and Certification Requirements
Structural hollow sections used in load-bearing frames must conform to recognized engineering codes — EN 1993 for European projects, AISC for North American builds, and local authority approvals elsewhere. [NEED_CITE: ASTM A500 structural tubing specification for building frames] The steel grade you select directly affects compliance: ASTM A500 Gr.B is the baseline for North American structural work, while S355 carries higher yield capacity for European designs requiring EN 10219 certification. Our tubes ship with Lloyd’s CE marking under EN 10210 and EN 10219, ISO 9001:2015 quality certification, and FPC factory production control — documents that clear customs without delays and satisfy project consultants reviewing material submittals. Surface treatment selection — black painted for indoor framing, hot-dip galvanized for outdoor or corrosive environments — must align with the project’s corrosion category, and we apply coatings per your specification before loading.
Steel Grade Selection and Manufacturing Process Explained
The ASTM A500 Gr.B, S235, S275, S355, STK400, Q235B, and Q345B grades we stock represent three distinct standard systems — American ASTM, European EN, and Chinese GB — each with different yield strength baselines. S235 serves general structural framing where moderate loads apply; S275 and S355 step up for heavier industrial frames and multi-story construction; Q345B and STK400 cover Asian market specifications. ERW welded tubes offer cost advantages for standard sizes and high-volume orders, with the weld seam meeting the same inspection standards as the parent metal. Seamless tubes eliminate the weld line entirely, preferred for applications where uniform strength around the full circumference matters. Wall thickness from 1mm to 30mm with ±1% tolerance means you get what you specify — no hidden negative tolerance eroding your structural calculations. [NEED_CITE: steel grade equivalence between ASTM A500 and EN 10219 standards]
Hidden Costs of Procurement Mistakes
Choosing the wrong grade or accepting undocumented material creates downstream expenses that dwarf the initial savings. A tube stamped S355 but testing as S235 fails structural load verification — the entire batch gets rejected, replacement material ships at premium air freight rates, and the project timeline slips. Missing mill test certificates trigger customs holds at destination ports; containers sit demurrage while your agent scrambles for documentation. Negative tolerance abuse means you pay for 6mm wall but receive 5.2mm — the weight shortfall compounds across hundreds of tons, and the structural engineer refuses to sign off. [NEED_CITE: consequences of non-compliant structural steel in construction projects] These are not theoretical risks; they are recurring problems we solve daily for buyers who switched from fragmented sourcing to verified factory-direct supply.
Why Project Buyers Source ASTM A500 Tubes From Us
We run three production lines simultaneously in Jinan, producing over 20,000 tons monthly across square, rectangular, and round sections — no trading company markup sits between you and the mill. Every batch leaves the factory with original mill test certificates documenting chemical composition and mechanical properties, and we welcome SGS or BV third-party inspection at any stage. Our inventory covers 2,800+ specifications, so standard sizes ship immediately while custom orders — non-standard dimensions, specific lengths, special surface treatment — complete in typical production lead times. We handle the entire export process: container loading optimization to maximize weight per shipment, complete documentation packages including certificate of origin and bill of lading, and flexible payment terms for recurring buyers. Long-term partners receive volume-based discount programs reviewed every six months, and our professional export team has shipped to 50+ countries without a single customs rejection due to documentation errors.
Documentation & Compliance
- Mill test certificate documenting ASTM A500 Gr.B chemical composition and mechanical properties per heat number
- Lloyd’s CE certificate covering EN 10210 hot-finished and EN 10219 cold-formed hollow sections for European market compliance
- ISO 9001:2015 quality management certificate covering the full production and inspection process
- SGS or BV third-party inspection report available on request for pre-shipment verification
- Material traceability by heat number linking each tube to its original coil and production batch
- Complete customs documentation including packing list, bill of lading, and certificate of origin
Packaging, Loading & Delivery
- Black painted ASTM A500 square and rectangular steel tubes bundled with steel strips and edge protectors to prevent coating damage during ocean transit
- Galvanized tubes packed separately with waterproof wrapping to preserve the zinc coating layer across 5.8m and 6m lengths
- Container loading plans optimized for 19×19mm small sections and 800×800mm large sections to maximize weight per 20ft and 40ft containers
- Random length and DRL tubes cut to your specified dimensions before packing, reducing on-site cutting waste
- Heat number and steel grade stenciled on each bundle for site identification and traceability verification
- FOB, CIF, and DDP delivery terms available with professional export documentation handling
Getting Your Project Quote Started
Send your specification sheet — section dimensions, wall thickness, steel grade, total tonnage, and destination port — and we return a detailed quotation within 12 hours including volume pricing, production timeline, and available mill test certificates. Non-standard sizes, special lengths, and custom surface treatment requirements get reviewed by our technical team for feasibility and lead time confirmation. We confirm certification requirements upfront so your documentation clears customs without delays.
Frequently Asked Questions
Q: Can you supply ASTM A500 Gr.B tubes with EN 10219 certification for European projects?
A: Yes, our production carries Lloyd’s CE certification under both EN 10210 and EN 10219 standards, and we provide cross-reference documentation showing grade equivalence between ASTM A500 Gr.B and S-series grades for projects requiring dual-standard compliance.
Q: What is the minimum order quantity for custom non-standard sizes?
A: We accept trial orders from 5 tons for standard specifications, and custom non-standard dimensions are available with flexible MOQ depending on the section size and production setup required.
Q: Do you provide third-party inspection before shipment?
A: SGS and BV third-party inspections are available on request at any stage — during production, pre-shipment, or at the loading port — with inspection reports included in your documentation package.
Q: How do you handle container loading for mixed-size orders?
A: Our export team prepares custom loading plans that nest small sections inside large rectangular tubes and optimize weight distribution, maximizing container utilization for multi-specification project orders.
Q: What surface treatment options are available for corrosive environments?
A: We offer hot-dip galvanizing for long-term outdoor corrosion protection, black painting for indoor applications, varnish coating for temporary protection during transit, and bare finish for projects where you apply on-site coating.
Get Your ASTM A500 Square and Rectangular Steel Tube Quote Today
Submit your specifications, steel grade, and quantity requirements to receive factory-direct pricing with mill test certificates within 12 hours.
Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@sdxinjiyuan.com
Website: www.sdxinjiyuan.com
