Description
Factory-direct pricing with zero middlemen — every Q195 Q235 Q345 ERW square rectangular steel tube rolls off our own production lines in Jinan, cutting your procurement cost at the source.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Q195/Q235/Q345 ERW Square/Rectangular Steel Tube |
| Product Type | ERW Square and Rectangular Steel Tube (SHS/RHS) |
| Steel Grade | Q195, Q235, Q345 |
| Standard | ASTM |
| Section Shape | Square, Rectangular |
| Size Range | 10×10–1000×1000 mm |
| Wall Thickness | 0.5–40 mm |
| Length | 1–12 m |
| Technique | ERW (Electric Resistance Welded) |
| Surface Treatment | Galvanized |
| Tolerance | ±1% |
| Ends | Plain (standard) |
| Processing Service | Cutting, Welding, Punching |
| Application | Steel structures / Construction frames / Machinery / Scaffolding / Furniture |
| MOQ | 25 Tons |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| EPC Contractors & Construction | Building frames, scaffolding systems, column supports |
| Machinery Manufacturers | Equipment bases, conveyor structures, machine guards |
| Infrastructure Developers | Bridge handrails, industrial platforms, support brackets |
| Steel Fabricators | Furniture frames, warehouse racking, gate posts |
What Dimensional Tolerance Actually Costs on a 25-Ton Structural Order
±1% tolerance sounds tight on paper — until a 40mm-wall RHS arrives at site with oversized corners that won’t fit your pre-drilled base plates.
When you order Q195 Q235 Q345 ERW square rectangular steel tube for load-bearing frames, every millimeter of deviation compounds across hundreds of connections. We’ve seen projects delayed weeks because wall thickness drifted into negative tolerance beyond acceptable limits, forcing on-site rework or full rejection. [NEED_CITE: EN 10219 cold-formed hollow section dimensional tolerance requirements]
How Galvanized ERW Tubes Match Corrosive Site Environments
Galvanized coating on Q195 Q235 Q345 ERW square rectangular steel tube provides sacrificial zinc protection that outperforms oiled or bare finishes in outdoor scaffolding, coastal infrastructure, and industrial washdown areas. The 0.5–40mm wall range covers everything from light furniture frames to heavy-duty column sections, while the ±1% tolerance ensures bolt-hole alignment holds across long spans. Our in-house lab verifies coating adhesion and thickness before every shipment — because a galvanized tube that flakes off at the weld seam is worse than bare steel.
Structural Compliance and Certification for Cross-Border Delivery
Engineering specs for Q195 Q235 Q345 ERW square rectangular steel tube often reference ASTM A500 for North American projects or EN 10219 for European tenders. Missing or incomplete mill certificates trigger customs holds and project compliance failures — a pain point we address with batch-traceable MTCs and third-party SGS/BV inspection reports. [NEED_CITE: steel grade equivalence mapping between GB Q-series and ASTM/EN standards]
Steel Grade Selection and ERW Weld Integrity
Q195 suits non-structural applications like furniture and light fencing where formability matters more than load capacity. Q235 steps up for general construction frames and scaffolding, while Q345 delivers higher yield strength for heavy machinery bases and bridge components. The ERW process creates a continuous longitudinal weld seam — our physical and chemical lab tests every heat for weld penetration and mechanical properties, ensuring the seam matches base metal strength. Galvanized surface treatment adds corrosion resistance without compromising weld quality for on-site connections.
Hidden Costs of Unverified Wall Thickness and Missing Certificates
Ordering Q195 Q235 Q345 ERW square rectangular steel tube without confirmed wall thickness tolerance invites structural rejections at inspection. Negative tolerance beyond ±1% reduces load capacity and fails engineering sign-off. Missing CE or ISO documentation delays EU customs clearance by weeks. Unverified steel grades risk material substitution — Q235 shipped as Q345 creates safety liability on load-bearing structures. [NEED_CITE: consequences of material non-compliance in structural steel procurement]
Why Procurement Teams Choose Our Production Lines
Every Q195 Q235 Q345 ERW square rectangular steel tube rolls through our 3 dedicated production lines covering 2,800+ specifications — from 10×10mm light gauge to 1000×1000mm heavy structural sections with wall thickness up to 40mm. Our in-house physical and chemical lab runs incoming, in-process, and final inspections, generating full MTCs per heat number. We hold CE certification under EN 10210/EN 10219 for EU market compliance, ISO 9001:2015 for quality management, and SGS/BV verification for third-party assurance. Custom non-standard sizes and proprietary sharp-corner rectangular tube technology fill specification gaps competitors can’t cover. Professional loading plans optimize container weight for 25-ton MOQ shipments, with FOB/CIF/DDP options and real-time tracking to 50+ countries.
Documentation & Compliance
- Mill test certificate documenting Q195/Q235/Q345 chemical composition and mechanical properties per ASTM standard, traceable by heat number
- CE certificate under EN 10210/EN 10219 for European market customs clearance and project compliance
- ISO 9001:2015 quality management system certificate covering full production and inspection process
- SGS or BV third-party inspection report available upon request for independent quality verification
- Material traceability documentation linking each bundle to specific heat number and production batch
- Complete customs document package including packing list, bill of lading, and certificate of origin
Packaging, Loading & Delivery
- Galvanized Q195 Q235 Q345 ERW square rectangular steel tube bundled with steel strips and edge protectors to preserve zinc coating during ocean transit
- Sea-worthy packaging with waterproof wrapping for 1–12m lengths, optimized for 20ft and 40ft container loading
- Custom cutting and punching services available to reduce on-site waste and labor costs for 10×10 to 1000×1000mm sections
- Heat number and steel grade markings stenciled on each bundle for site identification and traceability
- Professional loading plans maximize container payload for 25-ton MOQ shipments to EU, North America, Middle East, and Southeast Asia
- FOB/CIF/DDP shipping terms with door-to-door logistics coordination and real-time shipment tracking
Getting Your Quote and Mill Test Certificate
Submit your Q195 Q235 Q345 ERW square rectangular steel tube specifications — section size, wall thickness, length, quantity, steel grade, and destination port — and receive a detailed quote within 12 hours including unit price, delivery timeline, payment terms, and applicable certifications. Request material samples and original mill test certificates for quality confirmation before committing to production.
Start Your Procurement with Full Documentation
Send your Q195 Q235 Q345 ERW square rectangular steel tube requirements via email, WhatsApp, or phone to lock in factory-direct pricing and receive mill test certificates within 12 hours.
- Website: www.sdxjysteel.com
- Tel: +86 531 8573 6315
- Mobile/WhatsApp/WeChat: +86 188 5315 7756
- Email: admin@sdxjysteel.com
Frequently Asked Questions
Q: Can you produce non-standard sizes outside the 10×10 to 1000×1000mm range?
A: Yes, we manufacture custom non-standard dimensions beyond our standard 2,800+ specification catalog, including proprietary sharp-corner rectangular tubes that fill gaps in the global market.
Q: What documentation do you provide for EU customs clearance?
A: We supply CE certification under EN 10210/EN 10219, mill test certificates with full chemical and mechanical properties, and complete customs documents including packing list, bill of lading, and certificate of origin.
Q: How do you ensure wall thickness stays within ±1% tolerance?
A: Our in-house physical and chemical laboratory conducts incoming, in-process, and final inspections with real-time quality control across all 3 production lines, plus third-party SGS/BV verification is available.
Q: What is the minimum order quantity for Q195 Q235 Q345 ERW square rectangular steel tube?
A: Standard MOQ is 25 tons, but we accommodate custom non-standard specifications and can discuss flexible arrangements for project-specific requirements.
Q: Do you offer processing services like cutting and welding?
A: Yes, we provide in-house cutting, welding, and punching services to reduce your on-site fabrication costs and material waste for 1–12m lengths across all section sizes.
