Description
Factory-Direct Carbon Steel Square Rectangular Steel Tube Supplier — All sizes from 0.7mm wall thickness to 5.0mm, cut to your project length, shipped with original mill certificates.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Carbon Steel Square / Rectangular Steel Tube |
| Product Type | Square / Rectangular / Round Steel Tube (Seamless & ERW) |
| Steel Grade | Carbon Steel (ASTM A106 applicable) |
| Standard | ASTM A106 |
| Section Shape | Square / Rectangular / Round |
| Wall Thickness | 0.7mm – 5.0mm |
| Length | 1m – 12m or customized |
| Technique | ERW / Hot Rolled Based / Seamless Laser Welding |
| Surface Treatment | Galvanized (Z10–Z29), PVC, Black & Color Painting, Oiled or Non-oiled |
| Tolerance | ±1% |
| Hardness | Full Hard |
| Skin Pass | Yes |
| MOQ | 1 Ton |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Construction & Infrastructure | Building frames, handrails, scaffolding supports, bridge railings |
| Industrial Fabrication | Container structures, engineering supports, conveyor frames |
| Agricultural & Fencing | Perimeter fencing posts, gate frames, livestock enclosures |
| Furniture & Interior | Furniture frames, display racks, decorative exterior elements |
| Mechanical & Equipment | Small tool housings, pipe supports, corrugated sheet framing |
What Negative Tolerance Does to Your Structural Budget
A ±1% tolerance claim means nothing if the mill ships −5% actual.
When procurement teams order Carbon Steel Square Rectangular Steel Tube for load-bearing frames, the first cost they miscalculate is weight. A tube that measures 0.3mm under spec on every wall adds up across hundreds of meters — the structure passes visual inspection but fails the engineer’s weight verification. Worse, if the mill test certificate doesn’t match the heat number stamped on the tube, customs holds the container and your project timeline collapses. [NEED_CITE: EN 10219 cold-formed hollow section dimensional tolerance requirements]
How Wall Thickness Range Matches Structural Load Requirements
The 0.7mm to 5.0mm wall thickness range in our Carbon Steel Square Rectangular Steel Tube covers everything from light-duty furniture frames to heavy engineering supports. Thinner walls (0.7–1.5mm) work for non-structural applications like fencing and decorative elements where weight savings matter. Mid-range (1.5–3.0mm) handles standard building frames and handrails. The 3.0–5.0mm section carries engineering supports and container structures under dynamic loads. Our skin pass treatment ensures flat surfaces for clean welding connections, and the ±1% tolerance holds across the full range — verified by dimensional reports before shipment.
Engineering Compliance and Surface Protection Selection
Structural frames in coastal or industrial environments need more than bare steel. Our galvanized coating options (Z10–Z29) provide corrosion resistance proportional to exposure severity — Z10 for indoor structural use, Z275-equivalent Z29 for outdoor infrastructure. For projects requiring ASTM A106 compliance, we supply original mill test certificates documenting chemical composition and mechanical properties per standard. The ERW and seamless laser welding techniques serve different pressure and load requirements: ERW for standard structural applications, seamless for higher-pressure mechanical systems. [NEED_CITE: ASTM A106 seamless carbon steel pipe high-temperature service requirements]
Steel Grade Selection and Manufacturing Process Explained
Carbon steel square and rectangular tubes follow multiple standard systems — ASTM for North American projects, EN for European construction, GB for domestic Chinese specifications. The ASTM A106 grade in our range targets high-temperature service applications where material consistency under thermal cycling matters. ERW (Electric Resistance Welded) tubes offer cost efficiency for standard structural work, while seamless laser welded tubes provide superior pressure containment for mechanical systems. Surface treatment selection depends on the environment: galvanized (Z10–Z29) for corrosion protection, PVC coating for chemical resistance, painted finishes for aesthetic or additional barrier protection. The full hard condition delivers maximum strength for structural applications where deflection limits are tight.
The Hidden Cost of Unverified Material Certificates
Ordering Carbon Steel Square Rectangular Steel Tube without verified mill test certificates creates three failure points: customs rejection due to missing documentation, structural rejection when actual chemistry doesn’t match the certificate, and warranty voidance if the heat number can’t be traced. Projects specifying ASTM A106 require documented compliance — not a supplier’s word. When a container of tubes arrives without proper certification, the cost isn’t just the material replacement; it’s the crane rental, the crew standby, and the delayed handover penalty. [NEED_CITE: steel grade equivalence verification between ASTM and EN standards]
Why Procurement Teams Source Carbon Steel Square Rectangular Steel Tube from XJY Plate
We operate as a dedicated plate and tube division within Shandong Xin Jiyuan Special Steel Tube Co., Ltd, meaning every Carbon Steel Square Rectangular Steel Tube order goes through our own quality control — no trading company markup, no specification guessing. Our inventory covers the full 0.7–5.0mm wall thickness range in square, rectangular, and round sections, so mixed-size orders ship in one container rather than three partial loads. Every tube carries an original mill test certificate with heat number traceability, verified against our ISO 9001:2015 certified quality system. Custom cutting to your exact length (1–12m) eliminates on-site waste and welding labor. Third-party inspection through SGS or BV is available before shipment for projects requiring independent verification. Our logistics team specializes in heavy cargo — flatbed, open-top container, and break-bulk shipping — so your tubes arrive without edge damage or coating scratches.
Documentation & Compliance
- Mill test certificate documenting ASTM A106 chemical composition and mechanical properties per heat number
- ISO 9001:2015 quality management certificate covering production and inspection processes
- SGS or BV third-party inspection report available for projects requiring independent verification
- Material traceability report linking each tube to its heat number and production batch
- Export documentation including packing list, bill of lading, and certificate of origin
- CE marking documentation for European market entry where applicable
Packaging, Loading & Delivery
- Carbon Steel Square Rectangular Steel Tube bundled with steel strips and edge protectors to preserve galvanized coating during ocean transit
- Surface protection maintained through plastic wrapping for painted or PVC-coated tubes, preventing abrasion between pieces
- Container loading optimized for 1–12m lengths using open-top or flat-rack containers when standard 20ft units can’t accommodate full length
- Custom cutting to project-specified lengths reduces on-site waste and eliminates secondary cutting labor
- Heat number and steel grade stenciled on each bundle for site identification and traceability verification
- FOB, CIF, and DDP shipping terms available with professional heavy cargo logistics handling
Getting Your Carbon Steel Square Rectangular Steel Tube Quote Started
Send your specification list — section shape, wall thickness, length, surface treatment, quantity, and destination port — and we respond within 12 hours with pricing, available mill test certificates, and estimated production lead time. For custom cutting or non-standard sizes, we provide processing feasibility confirmation before you commit.
Request Your Carbon Steel Square Rectangular Steel Tube Quotation
Submit your specifications and destination to receive pricing, mill test certificate samples, and delivery timeline.
Company: 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
Frequently Asked Questions
Q: What is the difference between ERW and seamless laser welded Carbon Steel Square Rectangular Steel Tube?
A: ERW tubes are cost-effective for standard structural applications like building frames and fencing. Seamless laser welded tubes provide superior pressure containment for mechanical systems and high-temperature service. Both meet ASTM A106 requirements when specified.
Q: Can you provide galvanized coating in different thickness levels?
A: Yes, we offer galvanized coating from Z10 to Z29. Z10 suits indoor structural applications, while Z29 provides heavy corrosion protection for outdoor infrastructure and coastal environments.
Q: What documentation do you provide with each shipment?
A: Every shipment includes original mill test certificates with heat number traceability, packing list, bill of lading, and certificate of origin. ISO 9001:2015 certification and SGS/BV third-party inspection reports are available upon request.
Q: What is the minimum order quantity for custom-cut tubes?
A: The MOQ is 1 Ton. We can cut Carbon Steel Square Rectangular Steel Tube to your exact length specifications within the 1–12m range, eliminating on-site waste.
Q: Do you handle export logistics for heavy cargo?
A: Yes, our logistics team specializes in heavy flat products. We use flatbed trucks, open-top containers, and break-bulk shipping as needed. Edge protectors and proper bundling preserve surface treatment during transit.
