Product Specification
| Type | Cold-formed Round Steel Pipe |
| Shape | Round |
| Surface Treatment | Bared, Black Painted, Galvanized, Oiled or to your requirements |
| Out diameter | Φ25-Φ203, other sizes negotiable |
| Wall Thickness | 1.2mm-14mm, other sizes negotiable |
| Length | 4-12m or as request |
| Tolerance of OD | ±0.1mm |
| Tolerance of Straightness | ≤1mm |
| Technical Standard | GB/T 13793, GB/T6728-2017, GB/T3254, GB/T912,GB/T1591, GB/T16270,etc. |
| Material | Q235B/C/D/E, Q345B/C/D/E, Q390C/D/E, Q420C/D/E, Q550C/D/E, Q690C/D/E, 370L/420L/440L/510L/550L/ 610L/700L/750L/800L, QSTE380-700, S355-960MC |
| Technique | Cold-bend High-frequency |
| Supply Ability | 5000 tons |
| Payments Term | T/T or L/C |
| MOQ | 1 ton |
| Delivery condition | As-Welded, Annealed, Normalized, Cold-Rolled |
Product Description
Cold-formed round pipes are made from steel strips that are high-frequency welded and then reshaped into round sections through cold forming. These pipes offer a clean appearance, consistent size, and are ideal for applications not requiring high pressure resistance but demanding structural uniformity.
Application
| 1. Steel structure building | Railway, Airport, Curtain Wall, Mobile Villa. |
| 2. Agricultural machinery | Rotary Cultivator, Harvester, Turnover Plow. |
| 3. Shipbuilding industry | Ships, Offshore Platform, Container Ships. |
| 4. New energy industry | Battery Frame, Photovoltaic Support. |
Available Mold
Customization
With in-house tooling, material sourcing, and technical support, we offer flexible customization to meet your specific needs:
- Dimension Customization: Non-standard diameter, thickness, and length
- Material Options: Carbon steel, stainless steel
- Processing Services: Cutting, logo marking
- Surface Treatment: Painting, shot blasting, oiling, galvanizing
- Marking & Packaging: Custom logo, labels, and packaging options
We support drawing-based production, small batch trial orders, and fast sample delivery to help your projects start quickly.
Quality Control
- Use coil plate produced by large steel mills such as Baowu and Lianyuan steel as raw materials.
- Advanced welding equipment and technology to ensure welding quality.
- The combination of on-line internal burr scraping, flaw detection, on-line weld heat treatment and off-line overall heat treatment can ensure good overall performance of the pipe.
Packaging & Delivery
We provide professional packaging and flexible delivery options based on your product and shipping needs:
- Packaging Methods:
- Steel-strapped bundles with labels
- Plastic wrap + woven fabric cover
- Export-grade wooden cases or pallets
- Plastic end caps for tube protection
- Delivery Options:
- Sea freight, truck transport, or rail shipment
- Common ports:
- Shanghai, Changsha
- Lead Time:
- Standard sizes: 7–15 days
- Custom orders: 30–45 days
Export documents such as CO, CQ, and third-party inspection reports are available upon request.
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FAQ Section
Q1: What is ERW and HFW?
A1:ERW (Electric Resistance Welding) and HFW (High-Frequency Welding) are both methods of manufacturing welded steel pipes by using electric current to heat and join the edges of steel strips. HFW is actually a specialized, high-frequency version of ERW, offering improved weld quality and production efficiency.
Q2:ERW and HFW, which one has better performance?
A2: HFW is a high-frequency variant of ERW, offering better mechanical performance and more reliable weld seams. In modern steel pipe manufacturing, HFW is widely preferred for producing high-strength, pressure-resistant, and structural-grade welded pipes.
EXTEND
The Comparisons Between ERW and HFW
|
Category |
ERW (Electric Resistance Welding) |
HFW (High-Frequency Welding) |
|
Definition |
A process that joins steel edges using electric resistance. | A subtype of ERW that uses high-frequency current for heating. |
|
Frequency |
Range Low to medium frequency
(50 Hz – a few hundred kHz) |
High frequency (typically 100 – 800 kHz) |
|
Heating Method |
General resistive heating | Induction or contact high-frequency heating |
|
Weld Quality |
Basic weld quality, wider heat-affected zone (HAZ) | Superior weld quality, narrow HAZ, stronger joint |
|
Applications |
Light-duty or non-critical structures | Structural pipes, fluid transportation, pressure applications |
|
Cost |
Lower production cost | Slightly higher cost with better quality and reliability |
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