Description
Factory-direct ASTM A500 tubes — 2,800+ specifications in stock with wall thickness up to 40mm, shipped from our own production lines with full mill test traceability.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | ASTM A500 Carbon Steel ERW Seamless Square/Rectangular Steel Tube |
| Product Type | Square / Rectangular Steel Tube (SHS / RHS) |
| Steel Grade | Q195, Q235, Q345, S235JR, S275JR, S355JR |
| Standard | ASTM A500, AISI |
| Section Shape | Square |
| Size Range | 1×1 inches (25×25 mm) and above |
| Wall Thickness | 0.9 mm – 1.4 mm (up to 40 mm available) |
| Length | 6 m / 6.4 m / 12 m |
| Technique | Hot Rolled / ERW / Seamless |
| Surface Treatment | Black (Non-oiled) |
| Tolerance | ±1% |
| Ends | Plain |
| Processing Service | Bending, Cutting, Welding, Punching, Decoiling |
| Application | Structure Pipe, Fluid Pipe, Boiler Pipe, Drill Pipe, Hydraulic Pipe, Gas Pipe, Oil Pipe, Chemical Fertilizer Pipe |
| MOQ | 5 Tons |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| EPC Contractors & Construction | Structural frames, building columns, infrastructure support systems |
| Machinery Manufacturers | Equipment bases, conveyor structures, hydraulic cylinder housings |
| Industrial Distributors | Standard and non-standard SHS/RHS for regional stock and project resale |
| System Integrators | Automation frames, industrial rack structures, material handling systems |
What Negative Tolerance Really Costs on an ASTM A500 Structural Order
A wall thickness that passes factory gauging but fails ultrasonic recheck at destination port means the entire container gets rejected.
I spent years running tensile tests and wall-thickness measurements in our in-house lab before moving to export sales. The pattern I kept seeing: a batch of ASTM A500 square tubes would leave Jinan with every piece within the ±1% tolerance on paper, yet the client’s third-party inspector at the discharge port would flag entire bundles using ultrasonic equipment. The root cause was almost always the same — the mill ran the wall thickness at the absolute lower edge of negative tolerance, and the cumulative measurement deviation between the factory’s contact gauge and the port’s ultrasonic tester pushed readings outside the acceptable band. For an ASTM A500 carbon steel square rectangular tube supplier running multi-grade orders across Q195 through S355JR, the only reliable fix is measuring every single piece before loading and issuing the report with the container, not after the fact. [NEED_CITE: ASTM A500 dimensional tolerance requirements for cold-formed structural tubing]
How 0.9–40mm Wall Range Covers Thin-Wall Frames to Heavy-Duty Columns
An ASTM A500 carbon steel square rectangular tube supplier covering 0.9 mm through 40 mm wall thickness addresses two completely different procurement worlds in one order cycle. Thin-wall sections in the 0.9–1.4 mm range serve light structural framing, conveyor supports, and interior partition systems where weight savings and cost per meter matter more than load-bearing capacity. At the heavy end, 20–40 mm walls handle bridge bearing columns, crane runway beams, and high-rise transfer girders where the structural engineer specifies S355JR or Q345 for yield strength and refuses any compromise on wall uniformity. Our three dedicated production lines hold 2,800+ specifications across this full range, meaning an EPC contractor sourcing both purlin tubes and main column sections places one purchase order instead of splitting across three vendors.
Meeting ASTM A500 Compliance for North American Projects and Cross-Referencing EN 10219
Structural engineers designing to AISC specifications require ASTM A500 Grade B or C certification, and customs authorities in the United States and Canada will hold shipments without proper mill test documentation matching the declared grade. For projects in the European Union or markets that accept EN standards, the same physical tube may need CE marking under EN 10210 (hot-finished) or EN 10219 (cold-formed), which changes the documentation package even when the steel chemistry overlaps. Our CE certification under both EN 10210 and EN 10219, combined with Lloyd’s Register verification, means the ASTM A500 carbon steel square rectangular tube supplier can issue the correct certificate for the destination market from a single production run. [NEED_CITE: steel grade equivalence mapping between ASTM A500 and EN 10219]
Why Q195, S235JR, and S355JR Are Not Interchangeable on a Drawing
The Q-series (Q195, Q235, Q345) follows the Chinese GB standard where the number indicates minimum yield strength in MPa, while the S-series (S235JR, S275JR, S355JR) follows EN 10025 with the same naming logic but different impact testing requirements — specifically the JR designation requiring 27J Charpy impact at 20°C. An ASTM A500 carbon steel square rectangular tube supplier stocking both series lets procurement teams substitute grades when supply chain disruptions hit, but the structural engineer must approve any swap because the elongation and impact energy values differ. ERW welding produces a longitudinal weld seam suitable for structural and low-pressure fluid applications, while seamless construction eliminates the weld line entirely for high-pressure hydraulic and boiler service. Hot-rolled surfaces in black (non-oiled) finish work for indoor structural use or as a base for field-applied coatings, whereas outdoor or corrosive environments require galvanizing or painted protection specified separately.
The Hidden Cost of Buying ASTM A500 Tubes Without Verified Mill Test Certificates
Pricing that looks attractive on an ASTM A500 carbon steel square rectangular tube supplier quote often hides three cost traps that surface only after the container reaches the project site. Material that fails chemical composition verification against the declared grade means the structural engineer rejects the entire batch and the project faces weeks of delay sourcing replacement steel. Missing or mismatched heat numbers on mill test certificates trigger customs holds in markets with strict traceability enforcement, adding demurrage and inspection fees. Wall thickness running consistently at the negative tolerance boundary creates structural safety concerns under AISC or EN 1993 load calculations, forcing the client to commission independent ultrasonic testing at their own expense. [NEED_CITE: consequences of non-compliant steel tube documentation in international construction projects]
Why an ASTM A500 Carbon Steel Square Rectangular Tube Supplier Needs In-House Testing and Patented Sharp-Corner Capability
Every ASTM A500 carbon steel square rectangular tube supplier claims quality control, but the difference shows when a client needs a non-standard 380×220×18 mm rectangular tube with sharp corners — a geometry that conventional roll-forming cannot produce without visible radius at the corner. Our 41 invention patents include proprietary sharp-corner rectangular tube technology that fills this gap, letting structural architects specify tight-corner profiles for exposed frame aesthetics without switching suppliers. The in-house physical and chemical laboratory tests every heat before the tube leaves the line, generating mill test certificates with real measured values rather than nominal specifications. SGS and BV third-party inspections run before shipment on request, and our professional loading team optimizes container weight distribution for 6m and 12m lengths to avoid port-side repacking charges.
Documentation & Compliance
- Mill test certificate documenting Q195–S355JR chemical composition and measured yield strength per ASTM A500 or EN 10219 as specified
- CE certificate under EN 10210/EN 10219 for EU market customs clearance and structural compliance
- ISO 9001:2015 quality management certificate covering the full production and inspection process
- SGS or BV third-party inspection report issued before container sealing for client-verified quality
- Full heat number traceability linking each tube bundle to its original melt chemistry and mechanical test results
- Customs documentation package including packing list, bill of lading, and certificate of origin for destination clearance
Packaging, Loading & Delivery
- Black non-oiled ASTM A500 square and rectangular tubes bundled with steel strips and edge protectors to prevent surface scoring during ocean transit
- 6m and 12m lengths loaded with professional weight distribution plans to maximize 20ft and 40ft container payload without exceeding port crane limits
- Wall thickness marked with heat number and steel grade on each tube end for on-site identification and traceability verification
- Custom cutting to project-specific lengths available before shipment, reducing on-site waste and secondary cutting costs for EPC contractors
- FOB, CIF, and DDP shipping options with real-time tracking from Jinan port to destinations across EU, North America, Middle East, and Southeast Asia
Getting Your ASTM A500 Quote with Mill Test Certificates in One Step
Submit your specification sheet — section dimensions, wall thickness, steel grade, total tonnage, and destination port — and receive a detailed quotation with unit pricing, production lead time, and the applicable mill test certificate format within 12 hours. For non-standard sizes outside the 2,800+ stock range, our engineering team confirms feasibility and tooling requirements before you commit to a deposit.
Request Your ASTM A500 Square Rectangular Tube Quote Today
Send your specifications via email to admin@sdxjysteel.com or contact us on WhatsApp at +86 188 5315 7756 to receive pricing, mill test certificate samples, and container loading plans.
Frequently Asked Questions
Q: Can you supply ASTM A500 tubes in both Grade B and Grade C on the same order?
A: Yes. We produce and ship mixed-grade orders for ASTM A500 carbon steel square rectangular tube requirements, with each grade clearly separated, labeled, and documented on its own mill test certificate showing chemical composition and mechanical properties.
Q: What is the minimum order quantity for non-standard wall thickness above 1.4 mm?
A: Our MOQ is 5 Tons across all wall thickness options up to 40 mm. Non-standard dimensions outside the 2,800+ stock specifications may require a production run, and we confirm exact tonnage and lead time before contract signing.
Q: Do you provide CE certification for ASTM A500 tubes shipping to the European Union?
A: Yes. Our CE certification under EN 10210 and EN 10219 covers cold-formed and hot-finished hollow sections, and we issue the Declaration of Performance alongside the mill test certificate for EU customs and structural compliance.
Q: How do you handle wall thickness tolerance verification before shipment?
A: Every tube is measured using ultrasonic and contact gauging equipment in our in-house laboratory, and the actual measured values are recorded on the mill test certificate. We can arrange SGS or BV third-party inspection before container sealing for additional client verification.
Q: Can you cut ASTM A500 tubes to custom lengths shorter than 6 meters?
A: Yes. Our processing services include cutting to project-specified lengths, along with bending, welding, and punching. Custom-cut tubes are bundled separately with clear length markings to simplify on-site sorting for EPC contractors.
