About Us
Eastern Steel Manufacturing Co.,Ltd is a leading manufacturer and distributor of seamless steel pipe, welded steel pipe, OCTG products and fittings. We supply first-step processing, semi-finished parts and finished parts to help our clients meet fabrication requirements beyond their capacity or to improve operations by moving forward the pre-production processing.
News
In this column you can find the steel pipe related articles you need, including industry trends, product standards and materials, and some technical guidelines.
Services
Eastern Steel Manufacturing Co.,Ltd not only improve product production and sales services, but also provide additional value-added services. As long as you need, we can complete your specific needs together.
Facility
Eastern Steel Manufacturing Co.,Ltd not only improve product production and sales services, but also provide additional value-added services. As long as you need, we can complete your specific needs together.
Projects
Many years of large-scale project experience in various fields（Oil & Gas, Construction, Power Energy, Marine & Offshore, Water Treatment, Exploration & Drilling Services, Pipeline & Petrochemical etc.）, professional project team is responsible from receiving until the end of the project.
Rectangular hollow sections manufactured for structural, construction and mechanical applications.
Standards
ASTM A500/EN 10219/EN 10210/JIS G3466
Steel Grades
ASTM A500 Gr.B/ASTM A36/S235JRH/S355J2H/Q235B/Q355B
Sizes 40 × 20 mm – 500 × 300 mm
Thickness 1.5–20 mm
1. What Is Rectangular Steel Tube?
Rectangular tube is a welded hollow structural steel product, commonly referred to as Rectangular Steel Tube or Rectangular Hollow Section (RHS). It is widely used in construction, infrastructure, machinery, transportation, and fabrication projects.
Its rectangular profile offers an efficient balance of strength, rigidity, and weight, making it suitable for a wide range of structural and mechanical applications.
Eastern Steel manufactures rectangular steel tubes to ASTM, EN, JIS, and GB standards. We offer a wide range of sizes, wall thicknesses, steel grades, and surface finishes to meet the requirements of structural, industrial, and commercial applications.
Eastern Steel supplies rectangular tubes (RHS) in a wide range of sizes, wall thicknesses, steel grades, and international standards for structural and fabrication projects.
| Item | Specification |
|---|---|
| Product Type | Rectangular Hollow Section (RHS) |
| Manufacturing Process | ERW (Electric Resistance Welded) |
| Width | 20–300 mm |
| Height | 40–500 mm |
| Wall Thickness | 1.5–20 mm |
| Standard Length | 6 m / 12 m / Custom |
| Surface Finish | Black / Hot-Dip Galvanized / Pre-Galvanized |
| Standards | ASTM A500, EN 10219, EN 10210, JIS G3466, GB/T 6728 |
| Steel Grades | ASTM A500 Gr.B, ASTM A36, S235, S275, S355, Q235B, Q355B |
Rectangular tubes are available in a wide range of standard sizes from 40 × 20 mm to 500 × 300 mm, with wall thicknesses from 1.5 mm to 20 mm.
Standard production lengths include 6 m and 12 m, while custom dimensions and cutting services are available upon request.
For detailed dimensions and theoretical weights, refer to our Rectangular Tube Sizes Chart and Rectangular Tube Weight Chart.
Different projects require different mechanical properties and structural performance. Eastern Steel supplies rectangular steel tubes in multiple international steel grades to meet regional standards and engineering requirements.
| Steel Grade | Common Standard | Typical Applications |
|---|---|---|
| ASTM A500 Grade B | ASTM A500 | Structural steelwork, buildings, industrial frames |
| ASTM A36 | ASTM | General fabrication and welded structures |
| S235JRH | EN 10219 / EN 10210 | General structural fabrication |
| S275J0H | EN 10219 | Medium-strength structural applications |
| S355J2H | EN 10219 / EN 10210 | Heavy-duty structures, bridges, industrial buildings |
| Q235B | GB/T 6728 | General construction and fabrication |
| Q355B | GB/T 6728 | Structural engineering and heavy fabrication |
The final steel grade is typically selected according to structural design requirements, applicable standards, fabrication methods, and project specifications.
Eastern Steel manufactures ERW rectangular tubes (RHS) using the Electric Resistance Welding process.
Steel coils are cold-formed into a rectangular profile and continuously welded along the longitudinal seam using high-frequency electrical resistance. After welding, the tubes are sized, straightened, cut to length, and inspected to ensure consistent dimensions and reliable mechanical performance.
The ERW process delivers consistent dimensions, clean weld quality, and efficient production, making rectangular tubes suitable for structural steelwork, equipment manufacturing, and general engineering applications.
Different applications require different levels of corrosion protection and surface preparation. Eastern Steel supplies rectangular steel tubes with several surface finish options to suit structural, fabrication, and outdoor environments.
Standard mill finish without additional coating. Suitable for structural fabrication, welding, and applications where the tube will be painted or further processed.
A zinc coating provides long-term corrosion resistance for outdoor structures, fencing, infrastructure, and construction projects exposed to moisture.
Manufactured from galvanized steel strip before forming and welding. It offers a clean appearance and moderate corrosion protection for light-duty applications.
Additional finishes such as painting, powder coating, or special anti-corrosion treatments are available according to project requirements.
We provide reliable supply for OEM, distributors, contractors, and project procurement worldwide.
| Industry | Typical Applications |
|---|---|
| Construction | Building frames, columns, beams, roof structures |
| Infrastructure | Bridges, walkways, guardrails, support systems |
| Machinery Manufacturing | Equipment frames, machine bases, conveyors |
| Transportation | Trailer frames, vehicle structures, chassis components |
| Agriculture | Greenhouses, equipment frames, livestock facilities |
| General Fabrication | Gates, racks, furniture, storage systems |
Available sizes, steel grades, and surface finishes can be selected according to project requirements and applicable design standards.
- Rectangular Tube Sizes Chart
- Rectangular Tube Weight Chart
Eastern Steel is a manufacturer and supplier of ERW rectangular tubes, RHS steel sections, and rectangular hollow sections for structural and industrial projects worldwide.
We provide:
- Complete size range from 40 × 20 mm to 500 × 300 mm
- Multiple international standards including ASTM, EN, JIS, and GB
- Various steel grades for structural and industrial applications
- Black, pre-galvanized, and hot-dip galvanized finishes
- Standard production lengths and custom cutting services
- Export support with MTC, CO, and customs documentation
Rectangular steel tubes are available in standard and custom specifications, including multiple steel grades, dimensions, wall thicknesses, and surface finishes to meet different structural and fabrication requirements.
E-mail: sales@eastern-steels.com
