Description
Direct Factory Supply for ERW Round Steel Pipe — We manufacture JIS-certified Q195-Q345 and S235JR-S355JR round pipes in-house with full mill test documentation and third-party inspection support.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Q195/Q235/Q345/S355JR Round Steel Pipe |
| Product Type | Round Steel Pipe |
| Steel Grade | Q195, Q235, Q345, S235JR, S275JR, S355JR |
| Standard | JIS |
| Section Shape | Round |
| Outer Diameter | 38mm |
| Wall Thickness | Customization |
| Length | 1-12m (6m, 6.4m, 12m available) |
| Technique | ERW |
| Surface Treatment | Cold Rolled / Black Painted |
| Tolerance | ±1% |
| Ends | Plain |
| Application | Fluid Pipe, Boiler Pipe, Drill Pipe, Hydraulic Pipe, Gas Pipe, Oil Pipe, Chemical Fertilizer Pipe, Structure Pipe |
| MOQ | 20 Tons |
| Origin | China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Oil & Gas | Hydraulic pipelines, gas distribution networks, oil transport systems |
| Construction | Structural frames, scaffolding supports, building columns |
| Industrial Equipment | Boiler tubes, drill pipes, chemical processing vessels |
| Infrastructure | Bridge supports, conveyor structures, machinery foundations |
Where Wall-Thickness Tolerance Decides Project Acceptance
±1% dimensional accuracy prevents field-fit failures and structural rework.
I’ve seen entire shipments rejected at destination because wall thickness drifted beyond acceptable limits. When ERW round steel pipe arrives with inconsistent wall profiles, contractors face two problems: connection points don’t align during assembly, and load calculations based on theoretical weight become unreliable. The JIS standard demands precise control, but not all mills maintain the same laboratory rigor. Without proper verification, you’re gambling with project timelines and structural integrity. [NEED_CITE: JIS G3466 dimensional tolerance requirements for ERW pipes]
Precision Matching for Fluid Transport Systems
Hydraulic and gas pipelines demand consistent internal diameter for pressure integrity. Our 38mm ERW round steel pipe maintains ±1% tolerance across the full 1-12m length range, ensuring uniform flow characteristics and reliable weld connections. The cold rolled surface finish provides smooth internal walls that reduce friction losses in fluid transport applications.
Structural Compliance and Certification Requirements
Construction projects requiring JIS certification need complete documentation chains. Our Q235 and Q345 grades meet structural load requirements for building frames and scaffolding systems. Black painted surface treatment offers basic corrosion protection for indoor applications, while the ±1% tolerance ensures compliance with engineering specifications for load-bearing structures. [NEED_CITE: JIS structural steel pipe compliance for construction applications]
Understanding ERW Process and Steel Grade Selection
ERW (Electric Resistance Welded) process creates a longitudinal weld seam by heating steel strip edges and pressing them together under pressure. This method suits 38mm diameter pipes well, offering cost advantages over seamless alternatives while maintaining structural integrity for most applications. The Q-series grades (Q195-Q345) represent Chinese standard designations where the number indicates minimum yield strength in MPa. S-series grades (S235JR-S355JR) follow European EN standards with similar yield strength progression. For your 38mm ERW round steel pipe project, Q235/S235JR works for general structural use, while Q345/S355JR provides higher strength for heavier loads. Cold rolled surface treatment delivers smooth finish suitable for painting or direct use in non-corrosive environments.
Hidden Costs of Improper Grade Selection
Choosing the wrong steel grade or accepting substandard tolerance creates downstream problems. Material mismatch during customs inspection leads to shipment delays and additional testing costs. Structural components fabricated from pipes with excessive negative tolerance fail load testing, requiring complete replacement. Missing or incorrect mill test certificates block EU and regulated-market imports, forcing expensive re-documentation. [NEED_CITE: consequences of steel grade non-compliance in international trade]
Why Source Your ERW Round Steel Pipe From Us
Our in-house physical and chemical laboratory tests every batch before shipment, ensuring Q195-Q345 and S235JR-S355JR grades meet JIS specifications. We maintain 2,800+ specification coverage including custom wall thickness options for your 38mm diameter requirement. Full international certifications (ISO 9001:2015, SGS/BV verification) support customs clearance across 50+ countries. Professional container loading with anti-damage measures protects pipe surfaces during ocean transit. Custom cutting services deliver exact lengths from our 1-12m range, reducing on-site waste and labor costs.
Documentation & Compliance
- Mill test certificate documenting Q195-Q345 chemical composition and mechanical properties per JIS standard
- Material traceability by heat number for each 38mm ERW round steel pipe batch
- SGS or BV third-party inspection report available before shipment
- ISO 9001:2015 quality management system certification
- Complete customs documents including packing list, bill of lading, and certificate of origin
- Steel grade equivalence documentation for Q-series and S-series international standards
Packaging, Loading & Delivery
- 38mm ERW round steel pipes bundled with steel strips in seaworthy packaging for 6m and 12m lengths
- Black painted surface protected with edge guards to prevent coating damage during handling
- Container loading optimized for 1-12m pipe lengths with anti-bending supports
- Heat number and steel grade markings clearly identified on each bundle
- Custom cutting available for non-standard lengths from our 1-12m range
- FOB/CIF/DDP shipping terms with complete export documentation
Ready to Source Your ERW Round Steel Pipe?
Submit your specifications including diameter, wall thickness, steel grade (Q195-Q345 or S235JR-S355JR), quantity, and destination port. We respond within 12 hours with detailed quotation, lead time, and mill test certificate availability.
Request Your ERW Round Steel Pipe Quotation
Send your project specifications to receive pricing, technical documentation, and delivery timeline for JIS-certified 38mm round pipes.
Company: Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@sdxjypipe.com
Frequently Asked Questions
Q: How do Q235/Q345 grades compare to S235JR/S355JR in international standards?
A: Q235 and S235JR represent equivalent yield strength grades from Chinese and European standards respectively, while Q345 and S355JR provide higher strength options. Our mill test certificates document chemical composition and mechanical properties for both series, supporting international project compliance.
Q: What documentation do you provide for customs clearance?
A: Each shipment includes mill test certificate with chemical and mechanical test results, certificate of origin, packing list, and bill of lading. Third-party inspection reports from SGS or BV are available upon request for additional verification.
Q: Can you produce custom wall thickness for 38mm diameter pipes?
A: Yes, we offer customization for wall thickness on 38mm ERW round steel pipe orders. Our production capability covers various thickness options with ±1% tolerance control, supported by in-house laboratory testing.
Q: What surface treatment options are available?
A: We provide cold rolled finish for smooth surface suitable for painting or direct use, and black painted treatment for basic corrosion protection. Surface treatment selection depends on your application environment and end-use requirements.
Q: How do you ensure pipe protection during container loading?
A: Our professional loading team uses edge protectors, anti-bending supports, and proper bundling techniques to prevent surface damage and deformation during ocean transit. Each bundle is clearly marked with heat number and steel grade for easy identification.
Get Your ERW Round Steel Pipe Quote Today
Contact us with your project specifications to receive competitive pricing and complete technical documentation for JIS-certified Q195-Q345 and S235JR-S355JR round pipes.
