Description
Full-Range ASTM A500 Square & Rectangular Tube Supply — Hot-rolled and ERW hollow sections in Q235, Q345, S235JR, S355JR and ASTM A500 grades, stocked and cut to length from a single structural steel source.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | ASTM A500 Carbon Steel ERW Seamless Square/Rectangular Steel Tube |
| Product Type | Square / Rectangular Steel Tube (Hollow Section) |
| Steel Grade | Q195 / Q235 / Q345 / S235JR / S275JR / S355JR / ASTM A500 |
| Standard | ASTM A500 / AISI |
| Section Shape | Square / Rectangular |
| Size Range | From 1×1 inch (approx. 25×25 mm) and wider range available |
| Wall Thickness | 0.9 mm – 1.4 mm (and wider range available) |
| Length | 6 m / 6.4 m / 12 m |
| Technique | Hot Rolled / ERW / Seamless |
| Surface Treatment | Black (Hot Rolled, Non-oiled) |
| Tolerance | ±1% |
| Ends | Plain / Cut-to-size |
| Processing Service | Bending / Cutting / Welding / Punching / Decoiling |
| Application | Structure Pipe / Fluid Pipe / Boiler Pipe / Hydraulic Pipe / Gas Pipe / Oil Pipe / Chemical Fertilizer Pipe / Construction frames / Machinery / Scaffolding |
| MOQ | 5 Tons |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Construction & Infrastructure | Building frames, bridge support structures, scaffolding uprights, conveyor gantries |
| Machinery Manufacturing | Equipment bases, hydraulic cylinder housings, agricultural machinery frames |
| Petrochemical & Energy | Fluid transport lines, gas distribution piping, chemical fertilizer plant structures |
| Steel Fabrication & Trading | Cut-to-size hollow sections for welded assemblies, portal frames, mezzanine structures |
Grade Equivalence Gaps That Stall Structural Frame Approval
Mismatched ASTM A500 and EN-grade chemistry is the single most common reason for third-party inspection rejection on square and rectangular tube orders.
When a fabricator in Southeast Asia orders ASTM A500 Grade B but receives material tested only to Q235 chemistry, the mill test certificate cannot satisfy the engineer’s specification — even if the mechanical performance is close. Cross-referencing ASTM, EN, and GB standards requires documented equivalence tables, not supplier guesswork [NEED_CITE: steel grade equivalence between ASTM A500, EN 10219, and GB/T 6728 standards]. Buyers sourcing an ASTM A500 carbon steel square rectangular tube supplier without in-house metallurgical support often discover the gap only after the container reaches the destination port.
Matching Hollow Sections to Structural Load Paths
An ASTM A500 carbon steel square rectangular tube supplier serving structural frame projects must align section geometry, wall thickness, and steel grade to the load path. Square sections distribute compressive force evenly across four faces, making them preferred for column applications, while rectangular sections offer higher moment of inertia along the strong axis for beam and purlin roles. Hot-rolled black finish provides a clean base for site welding and subsequent galvanizing, avoiding the zinc spatter issues that arise when fabricators weld over pre-galvanized sections. Our cutting and bending services allow fabricators to receive pre-processed lengths, reducing secondary workshop time at destination.
Engineering Compliance Across ASTM, EN, and GB Frameworks
Structural hollow sections used in load-bearing frames must conform to the design code governing the project — AISC 360 for North America, EN 1993-1-1 for Europe, or GB 50017 for China-exported infrastructure. ASTM A500 covers cold-formed welded and seamless carbon steel structural tubing, while EN 10219 governs cold-formed welded structural hollow sections; the two are not interchangeable without documented equivalence [NEED_CITE: EN 10219 cold-formed structural hollow section dimensional and technical requirements]. CE certification is mandatory for structural steel entering the EU market, and the mill test certificate must trace each piece to its heat number, chemical composition, and mechanical test results. Tolerance compliance — here ±1% on wall thickness — directly affects theoretical weight calculations and structural safety factors.
Reading the Steel Grade Designation on Your Order
The steel grades listed — Q195, Q235, Q345, S235JR, S275JR, S355JR, and ASTM A500 — span three distinct standard systems. The Q-series (GB/T 700 and GB/T 1591) uses yield strength in MPa as the designation basis: Q235 indicates a minimum yield of 235 MPa. The S-series (EN 10025) follows the same logic, with the JR suffix denoting room-temperature Charpy impact energy of 27 J. ASTM A500 Grade A, B, C, and D define progressively higher yield and tensile requirements. Selecting the correct grade depends on the structural engineer’s specification, the service environment, and the welding procedure qualification. ERW (Electric Resistance Welded) tubes offer cost efficiency for structural and low-pressure fluid applications, while seamless construction is specified where internal pressure integrity or uniform through-thickness properties are critical. The hot-rolled black, non-oiled surface is the standard delivery condition for structural use — it accepts paint, galvanizing, and weld preparation without additional surface treatment.
The Hidden Cost of Negative Tolerance and Missing Traceability
Ordering an ASTM A500 carbon steel square rectangular tube supplier who delivers wall thickness below the specified tolerance creates a cascade of failures: the fabricator’s weld joint preparation is wrong, the structural engineer’s load calculations are invalidated, and the third-party inspector rejects the batch on dimensional grounds [NEED_CITE: consequences of negative tolerance deviation in structural steel hollow sections]. Missing or forged mill test certificates compound the problem — without verifiable heat numbers and chemical composition data, customs authorities in strict-import markets can hold or return the shipment. The cost of re-rolling, re-shipping, and project delay far exceeds the initial price difference between a traceable supplier and an unverified source.
Why Fabricators and EPCs Source ASTM A500 Tube From Us
We operate as a dedicated structural and flat steel supplier, not a general trader passing orders between mills. Every ASTM A500 carbon steel square rectangular tube we ship is backed by an original mill test certificate traceable to the heat number — the same discipline I apply after watching a Middle Eastern client reject an entire square tube shipment because the wall thickness failed third-party re-inspection. Our in-house processing covers bending, cutting, welding, and punching, so fabricators receive components ready for assembly rather than raw lengths requiring secondary work. We hold ISO 9001:2015 and CE certification, and we arrange SGS or BV third-party inspection at the client’s request. For heavy structural orders, our logistics team plans flatbed, open-top container, or break-bulk loading to avoid overweight penalties and transit damage — experience built from years of shipping 6 m and 12 m tube bundles to ports across Southeast Asia, the Middle East, and South America.
Documentation & Compliance
- Mill test certificate documenting Q235, Q345, S235JR, or S355JR chemical composition and mechanical properties per ASTM A500 or EN 10219, traceable to heat number
- CE certificate covering structural hollow sections per EN 10210 and EN 10219 for EU market customs clearance
- ISO 9001:2015 quality management certificate covering production, inspection, and export processes
- SGS or BV third-party inspection report available upon request for dimensional verification and witness testing
- Material traceability sheet linking each bundle to its heat number, steel grade, and dimensional inspection results
- Full customs documentation set: commercial invoice, packing list, bill of lading, and certificate of origin
Packaging, Loading & Delivery
- ASTM A500 square and rectangular tubes bundled with steel strip ties and edge protectors to prevent surface scratching on the black hot-rolled finish during transit
- Cut-to-size lengths (6 m, 6.4 m, 12 m, or custom) loaded in seaworthy bundles optimized for 20ft and 40ft open-top container payload without exceeding port weight limits
- Plain or beveled ends capped with plastic protectors to prevent moisture ingress and edge damage on the non-oiled black surface
- Heat number and steel grade stenciled on each bundle for on-site traceability verification by third-party inspectors
- FOB, CIF, and DDP shipping terms available, with flatbed and break-bulk options for project cargo exceeding container dimensions
- Professional heavy cargo loading plans prepared per destination port regulations to avoid overweight penalties and customs holds
Getting Your ASTM A500 Tube Order Quoted and Verified
Submit your required steel grade, section dimensions, wall thickness, length, quantity, and destination port — we respond within 12 hours with a detailed quotation covering material cost, any processing fees for cutting or bending, and shipping terms. We provide the original mill test certificate before or with shipment so your quality team can verify chemistry and mechanical properties against the project specification. For non-standard dimensions or cut-to-size requirements, we confirm feasibility and lead time before contract signing.
Request Your ASTM A500 Hollow Section Quotation and Mill Test Certificate
Send your specification — steel grade, size, wall thickness, length, quantity, and destination — to receive a detailed quote with original MTC and shipping plan.
Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Website: www.xjyplate.com
Tel: +86 531 8573 6315
Mobile / WhatsApp / WeChat: +86 188 5315 7756
Email: admin@xjyplate.com
Address: No.11889, Jingshi West Road, Lulian Group, Jinan City, Shandong Province, China
