ERW Carbon Steel Tubes
Round, Square and Rectangular ERW Steel Tubes for Structural and Mechanical Applications
Our ERW Carbon Steel Tubes are manufactured from steel strip or coil through forming and electric resistance welding. The process joins the formed edges along the tube length, creating a continuous longitudinal weld without adding filler metal.
We offer ERW carbon steel tube categories in round, square and rectangular profiles for structural fabrication, mechanical manufacturing and general industrial applications.
Key Product Characteristics
- Longitudinal Welded Construction: Electric resistance welding joins the formed steel edges along the tube length, creating a continuous longitudinal seam.
- Round Tube Profiles: Used in mechanical structures, general pipe applications and equipment manufacturing where circular sections are required.
- Square Tube Profiles: Used in structural frameworks, support frames, machinery and furniture manufacturing.
- Rectangular Tube Profiles: Used in equipment frames, brackets and fabricated structures requiring rectangular sections.
02. Product Specifications & Selection
The right ERW carbon steel tube depends on the intended application, applicable standard, steel grade, dimensions and connection requirements.
Product Specification Table
| Manufacturing Process | Electric Resistance Welding (ERW) |
| Tube Profiles | Round, Square, Rectangular |
| Applicable Standards | ASTM A53, ASTM A500, API 5L, subject to product scope |
| Steel Grades | ASTM A53 Grade A, ASTM A53 Grade B |
| Dimensions | Outside Diameter, Side Length, Width, Height, Wall Thickness |
| Length | Random Length, Fixed Length |
| Surface Finish | Black, Hot-Dip Galvanized, Electro-Galvanized, Anti-Rust Oil, Protective Coating |
| End Finish | Plain End, Beveled End, Threaded End, Grooved End |
Selecting the Appropriate Standard
- ASTM A500: A relevant standard for structural tubing. Selection depends on the required grade, tube profile and structural specifications.
- ASTM A53: Covers specified steel pipe products. Selection should consider the required grade, manufacturing type and service conditions.
- API 5L: Covers line pipe products. Selection depends on the required steel grade, product specification level and pipeline requirements.
These standards address different product applications and should be matched to the actual tube specification and intended use.
03. Tube Profiles & Industrial Applications
Our three tube profiles serve different fabrication and installation requirements.
- Round ERW Carbon Steel Tubes: Their circular cross-section is used in mechanical structures, general pipe applications and equipment manufacturing.
- Square ERW Carbon Steel Tubes: Their square profile is used in support frames, structural frameworks, machinery and furniture manufacturing.
- Rectangular ERW Carbon Steel Tubes: Their rectangular profile is used in equipment frames, brackets and fabricated structures requiring rectangular sections.
Surface & End Configurations
We offer distinct surface and end-processing options according to the required product configuration:
- Surface Finishes: Black, hot-dip galvanized, electro-galvanized, anti-rust oil and protective coating.
- End Finishes: Plain, beveled, threaded and grooved ends.
These configurations allow the tube specification to be matched to the required surface condition, fabrication process and connection method.
04. Company Business & Quality Requirements
We are a steel industry company established in 2012, based in Shanxi, China. Our business activities cover steel coils, steel sheets, steel strips, H-beams and other steel products.
Our product portfolio includes:
- Steel Pipes and Pipe Fittings
- Steel Coils and Steel Plates
- Steel Strips
- Structural Steel Sections
- Steel Bars and Steel Wires
ERW Tube Quality Inspection Requirements
For ERW carbon steel tube orders, the following inspection items can be specified according to the applicable product standard and purchase requirements.
| Dimensional Inspection | Outside Diameter, Wall Thickness, Section Dimensions, Dimensional Tolerances |
| Material Verification | Chemical Composition, Mechanical Properties |
| Weld Inspection | Weld Quality Inspection, Applicable Nondestructive Testing |
| Product Testing | Flattening Test, Bending Test, Hydrostatic Test |
| Documentation | Material Test Certificates, Inspection Records |
The applicable inspection methods and acceptance requirements are determined by the selected product standard and order specification.
05. Customization & Order Configurations
We coordinate ERW carbon steel tube orders according to the required profile, material specification, dimensions, surface finish and end processing.
| Tube Shape | Round, Square, Rectangular |
| Material Standard | ASTM and Other Agreed Standards |
| Steel Grade | According to the Specified Standard |
| Tube Dimensions | Outside Diameter, Side Length, Width, Height, Wall Thickness |
| Length | Random Length, Fixed Length |
| Surface Treatment | Black, Hot-Dip Galvanized, Electro-Galvanized, Anti-Rust Oil, Protective Coating |
| End Processing | Plain, Beveled, Threaded, Grooved |
| Packaging | Bundling, End Protection, Identification Labels, Export Protection |
Dimensional limits, steel grade availability, processing feasibility, packaging details and minimum order quantities are confirmed according to the requested specifications.
06. Bulk Supply & Order Support
We provide product consultation and order coordination for our steel product business, supporting customers from initial specification discussions through quotation and order follow-up.
Our Order Support Includes
- Product Consultation: Discuss ERW tube specifications, applicable standards, steel grades, dimensions and product configurations.
- Customization Communication: Coordinate requested dimensions, surface finishes, end processing and other order details.
- Quotation & Order Confirmation: Prepare quotations and confirm product specifications, quantities and packaging requirements.
- Production & Inspection Updates: Provide relevant information about order progress and production and inspection arrangements.
- After-Sales Support: Handle product-related questions and follow-up after delivery.
Our broader steel product range includes steel pipes, fittings, coils, plates, strips, structural steel sections, bars and wires.
07. Request a Quotation
Looking for ERW carbon steel tubes for your next order?
Send us your main product requirements for a quotation.
The following details are useful for initial pricing:
- Tube Profile: Round, square or rectangular.
- Standard & Grade: ASTM A53, ASTM A500, API 5L or another specified standard and grade.
- Dimensions: Outside diameter or section size, wall thickness and required length.
- Surface & End Finish: Black, hot-dip galvanized, electro-galvanized, anti-rust oil, protective coating, plain, beveled, threaded or grooved.
- Order Quantity: Required quantity and delivery destination.
You can also send us a drawing or technical specification if available.
We will review your requirements, coordinate the product and order details, and prepare a quotation for your ERW carbon steel tube order.