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Home > Metallurgy, Mineral & Energy > Steel & Products > Steel Pipe & Tube > ERW Welded Steel Tubes — ASTM A178 / EN / GB for Heat Exchangers, Automotive & Mechanical Applications | OD 6-256mm
ERW Welded Steel Tubes — ASTM A178 / EN / GB for Heat Exchangers, Automotive & Mechanical Applications | OD 6-256mm
Product Spotlights
Wuxi Hengzhihui supplies high-quality ERW welded steel tubes in carbon steel grades, compliant with ASTM A178, ASME SA178, EN, DIN, and GB standards. Engineered for industrial equipment, heat transfer systems, automotive components, mechanical applications, and OEM projects. Available in outside diameter range from 6mm to 256mm in carbon steel and stainless steel options. Our welded tubes provide cost-effective solutions with stable quality, accurate dimensions, and reliable weld integrity.
Negotiable
MOQ: 1 Metric Ton (Price negotiable depending on order volume and customization)
Key Specifications
Get Latest Price
Type:
Welded
Warranty:
1Y
Technique:
ERW
Payment & Shipping
Payment Methods:
Port of Shipment:
Shanghai
Delivery Detail:
30 days
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Type
Welded
Warranty
1Y
Technique
ERW
Surface Treatment
Polished
Usage
Pipeline Transport, Boiler Pipe, Hydraulic/Automobile Pipe, Oil/Gas Drilling, Food/Beverage/Dairy Products, Machinery Industry, Chemical Industry, Mining, Construction & Decoration, Special Purpose, Other
Material
Carbon Steel
After-sales Service
Y
Section Shape
Square
Transport Package
Hexagonal or square bundles
Specification
6~256MM
Trademark
N/A
Origin
CHINA
ERW Welded Steel Tubes — ASTM A178 / EN / GB for Heat Exchangers, Automotive & Mechanical Applications | OD 6-256mm
Wuxi Hengzhihui supplies high-quality ERW welded steel tubes in carbon steel grades, compliant with ASTM A178, ASME SA178, EN, DIN, and GB standards. Engineered for industrial equipment, heat transfer systems, automotive components, mechanical applications, and OEM projects. Available in outside diameter range from 6mm to 256mm in carbon steel and stainless steel options. Our welded tubes provide cost-effective solutions with stable quality, accurate dimensions, and reliable weld integrity. EN 10204 Type 3.1 certification and customized processing services supported.
What are Welded Steel Tubes?
Welded steel tubes are manufactured by forming steel strip or plate into a tubular shape and joining the edges through welding processes. The most common method is ERW (Electric Resistance Welding) , where high-frequency current generates heat at the strip edges, which are then pressed together to form a continuous weld seam.
Key Advantages of Welded Tubes:
✅ Cost-Effective — Lower manufacturing cost compared to seamless tubes
✅ Flexible Production — Easier to produce in large volumes
✅ Good Dimensional Control — Consistent OD and wall thickness
✅ Wide Size Range — Suitable for various industrial applications
✅ Uniform Wall Thickness — No eccentricity issues
Key Specifications
| Parameter | Range / Details |
|---|---|
| Outside Diameter | 6mm – 256mm (custom sizes available) |
| Wall Thickness | 0.5mm – 16mm (depending on OD and standard) |
| Manufacturing Process | ERW — Electric Resistance Welding (High Frequency) |
| Standard | ASTM A178, ASME SA178, EN, DIN, GB |
| Surface Condition | Black / Pickled / Galvanized / Oiled |
| Length | Random length (5-12m) or fixed length as per order |
| End Finish | Plain ends / Beveled ends / Chamfered |
| Testing Methods | Hydrostatic Test, Eddy Current Test (ECT), Tensile Test, Hardness Test, Weld Appearance Inspection |
| Documentation | Mill Test Certificate, EN 10204 Type 3.1, Inspection Report, Weld Test Report |
Available Standards & Grades
| Standard | Grade | Material Type | Primary Application |
|---|---|---|---|
| ASTM A178 / ASME SA178 | Grade A (Low Carbon) | Carbon Steel | Boilers, heat exchangers, condensers |
| ASTM A178 / ASME SA178 | Grade C (Medium Carbon) | Carbon Steel | Higher strength thermal applications |
| EN 10219 (Structural) | S235, S275, S355 | Carbon Steel | Construction, industrial structures |
| EN 10217 (Pressure) | P235, P265 | Carbon Steel | Pressure equipment, pipelines |
| GB/T 3091 (Fluid Pipe) | Q235, Q345 | Carbon Steel | Fluid transport, structural applications |
| GB/T 13793 (Welded Tube) | Q235, Q345, 20# | Carbon Steel | Mechanical structures, general engineering |
Product Categories by Application
| Product Type | Standard | Grade | Typical End Use |
|---|---|---|---|
| Welded Boiler Tube | ASTM A178 / ASME SA178 | Grade A / Grade C | Boilers, heat exchangers, condensers, heat transfer equipment |
| Structural Welded Tube | EN 10219 / GB/T 3091 | S235, S275, Q235, Q345 | Industrial structures, construction, machinery frames |
| Fluid Transport Tube | GB/T 3091 / EN 10217 | Q235, P235 | Water, gas, oil pipelines, fluid systems |
| Welded Precision Tube | Customized | Q235, 20# | Automotive components, furniture structures, mechanical parts |
| Mechanical Welded Tube | GB/T 13793 | Q235, Q345 | Equipment manufacturing, mechanical components |
ERW Tube Manufacturing Process
| Process Step | Description |
|---|---|
| 1. Uncoiling & Leveling | Steel strip is uncoiled and leveled to prepare for forming |
| 2. Edge Milling | Strip edges are milled to ensure clean, precise welding surfaces |
| 3. Forming | Continuous roll forming gradually shapes the strip into a tubular shape |
| 4. High-Frequency Welding | High-frequency current heats the strip edges; pressure fuses them into a continuous weld |
| 5. Sizing & Straightening | Tube is sized to precise OD and straightened |
| 6. Cutting | Cut to required length |
| 7. Weld Seam Annealing | Optional heat treatment to relieve weld stress |
| 8. Testing & Inspection | Hydrostatic, ECT, dimensional, and visual inspection |
| 9. Finishing | Surface treatment, end finishing, packaging |
ASTM A178 Welded Boiler Tubes
| Parameter | Details |
|---|---|
| Standard | ASTM A178 / ASME SA178 — Seamless and Welded Carbon Steel Boiler Tubes |
| Grades | Grade A (Low Carbon) — General boiler and heat exchanger applications |
| Grade C (Medium Carbon) — Higher strength requirements | |
| OD Range | 1/2" – 5" (12.7mm – 127mm) |
| Manufacturing | ERW with full weld penetration |
| Applications | Boilers, heat exchangers, condensers, heat transfer equipment |
| Key Requirements | Chemical composition, tensile strength, flattening test, flaring test, hydrostatic or NDT |
Welded vs Seamless Comparison
| Feature | Welded Tubes | Seamless Tubes |
|---|---|---|
| Cost | Lower — Economical for large volumes | Higher — More expensive |
| Pressure Rating | Good for medium pressure | Excellent for high pressure |
| Production Flexibility | Flexible, quick lead times | Longer production lead times |
| Size Availability | Wide range, up to large diameters | Limited by billet size |
| Wall Thickness Uniformity | Consistent, no eccentricity | Potential eccentricity |
| Weld Seam | Yes — requires inspection | No — uniform structure |
| Best Applications | General industrial, heat transfer, structures, automotive | High pressure, critical safety, extreme conditions |
We supply BOTH seamless and welded tubes. Contact us to help you choose the right solution.
Quality Control Inspection
| Inspection Type | Method | Purpose |
|---|---|---|
| Weld Appearance Inspection | Visual inspection | Verify weld seam uniformity, surface quality |
| Hydrostatic Testing | Pressure test equipment | Verify leak-tightness and pressure resistance |
| Eddy Current Testing (ECT) | NDT | Detect weld seam and surface defects |
| Tensile Testing | Universal testing machine | Confirm yield strength, tensile strength |
| Hardness Testing | Rockwell / Brinell tester | Verify hardness within specification range |
| Flattening Test | Hydraulic press | Assess weld strength and ductility |
| Flaring Test | Hydraulic press | Assess weld integrity under expansion |
| Dimensional Inspection | Micrometer, caliper, gauge | Verify OD, WT, length, straightness |
Application Industries
| Industry | Typical Equipment | Recommended Grades |
|---|---|---|
| Heat Exchanger Industry | Condensers, thermal systems, cooling equipment | ASTM A178 Grade A/C |
| Automotive Industry | Structural components, exhaust systems, mechanical parts | Q235, EN S235, 20# |
| Industrial Equipment | Frames, supports, machinery components | Q235, Q345, S275 |
| Construction Industry | Scaffolding, structures, engineering projects | Q235, S235, S275 |
| Fluid Transport | Water pipelines, gas pipelines, oil systems | GB/T 3091, EN 10217 |
| Furniture & General Engineering | Frames, stands, mechanical assemblies | Q235, 20# |
Manufacturing Capability
| Capability | Description |
|---|---|
| Welding Process | ERW — High-frequency welding (HFW) |
| Tube Processing | Cutting, straightening, surface treatment, end finishing |
| Surface Treatment | Black (as-welded), Pickled, Galvanized, Oiled |
| Heat Treatment | Weld seam annealing upon request |
| Customized Processing | Drilling, bending, painting, threading upon request |
| OEM Support | Custom sizes, grades, and packaging options available |
Why Choose Hengzhihui Welded Tubes?
| Advantage | Description |
|---|---|
| Complete Tube Solution Provider | We supply seamless tubes, welded tubes, and precision tubes — covering all your tube needs |
| International Standard Capability | Supporting ASTM, ASME, EN, DIN, and GB specifications |
| Flexible Manufacturing Network | Supporting small orders, OEM projects, and customized requirements |
| Professional Quality Management | Full inspection with weld integrity verification |
| Global Export Experience | Technical communication, documentation, and logistics support |
| Competitive Pricing | Optimized supply chain for cost-effective welded tube solutions |
Technical Data Table — Quick Reference
| Product | Standard | Grade | Primary Application |
|---|---|---|---|
| Welded Boiler Tube | ASTM A178 | Grade A / Grade C | Boilers, Heat Exchangers, Condensers |
| Structural Welded Tube | EN 10219 | S235, S275, S355 | Construction, Industrial Structures |
| Fluid Transport Tube | GB/T 3091 | Q235, Q345 | Water, Gas, Oil Pipelines |
| Mechanical Welded Tube | GB/T 13793 | Q235, Q345 | Equipment Manufacturing, Machinery |
| Pressure Welded Tube | EN 10217 | P235, P265 | Pressure Equipment, Fluid Systems |
FAQ
| Question | Answer |
|---|---|
| What welded tubes does Hengzhihui supply? | We supply ERW welded tubes, ASTM A178 welded boiler tubes, EN/GB structural and fluid tubes, and customized welded precision tubes. |
| What is the difference between seamless and welded tubes? | Seamless tubes have no weld seam and are preferred for high pressure and critical applications. Welded tubes provide more cost-effective solutions for general industrial uses. |
| What is your tube size range for welded tubes? | Our welded tube capability covers OD 6mm to 256mm. |
| Can you provide ASTM A178 welded tubes? | Yes. We supply ASTM A178 Grade A and Grade C welded boiler tubes for heat exchanger and boiler applications. |
| Do you offer galvanized surface treatment? | Yes. Galvanized, pickled, oiled, and black surface finishes are available upon request. |
| Can you provide customized welded tubes? | Yes. We support customized dimensions, grades, surface treatments, and project-specific requirements. |
| What documentation do you provide? | Mill Test Certificate, EN 10204 Type 3.1, Inspection Report, and Weld Test Report. |
Send Inquiry
To receive a tailored quotation for your welded tube project, please provide:
Standard and grade (e.g., ASTM A178 Grade A / EN 10219 S235 / GB/T 3091 Q235)
Outside diameter and wall thickness
Total quantity (pieces or metric tons)
Required length and end finish (plain / beveled)
Surface treatment requirement (black / pickled / galvanized / oiled)
Application and any special processing requirements
📩 Click "Send Inquiry" or contact us directly with your specifications — we will respond within 24 hours.
📧 Email: yjhtrade@gmail.com
📞 WhatsApp: +86 15106174543
🌐 Website: /
Contact Person: Alice Yuan
Send Inquiry to This Supplier
1Yr
Business Type
Trading Company
Year Established
2021
Factory Size
50,000-100,000 square meters
Annual Export Value
Below US$1 Million
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