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Help CenterERW Carbon Steel Pipe ASTM A500 Grade B, Square/Rectangular Section, Pre-galvanized, 4x6 Inch Profile
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Hemaokang Steel (Shandong) Co., Ltd. presents this ERW Carbon Steel Pipe ASTM A500 Grade B in a versatile square/rectangular profile of 4x6 inch, pre-galvanized for superior corrosion resistance. As a manufacturer based in Liaocheng, Shandong, we combine efficient ERW production with rigorous quality control to deliver structural tubing that meets the demands of construction, agricultural, and industrial projects worldwide. This product is engineered for strength, dimensional accuracy, and long service life, making it a reliable choice for distributors and fabricators who value consistency and performance.
Our A500 Grade B carbon steel tube is formed through electric resistance welding (ERW), offering a smooth surface, uniform wall thickness, and excellent weldability. The pre-galvanized coating provides an initial layer of protection against rust and atmospheric corrosion, which helps reduce onsite maintenance and extend the service life of finished structures. The rectangular 4x6 inch cross-section delivers an optimal strength-to-weight ratio, enabling efficient load-bearing capacity while minimizing material usage.
Below is a detailed overview of the key technical specifications and product features:
| Standard | ASTM A500 Grade B |
| Process | ERW (Electric Resistance Welding) |
| Section Shape | Square / Rectangular |
| Profile Size | 4 x 6 inches (approx. 100 x 150 mm) |
| Surface Treatment | Pre-galvanized (hot-dip or electro-galvanized optional) |
| Available Length | 6 m / 12 m / cut-to-length |
| Wall Thickness | 2.0 mm – 6.0 mm (customizable) |
| Certification | ISO9001 |
Key advantages of our ERW carbon steel square/rectangular pipe:
- High dimensional accuracy – Cold-formed and precision-welded, ensuring consistent profiles for easy installation and fabrication.
- Superior weldability – Low carbon content and stable composition allow for clean welding, cutting, drilling, and machining.
- Pre-galvanized protection – The zinc coating offers effective sacrificial corrosion resistance, especially suitable for outdoor or humid environments.
- Cost-effective structural solution – Compared to solid bars or seamless tubes, ERW pipes provide similar strength with lighter weight and lower cost.
- Versatile applications – Ideal for building frames, mezzanine structures, handrails, trailers, storage racks, agricultural shelters, and many other general engineering purposes.
- Ready-to-use surface – The pre-galvanized finish is clean and uniform, reducing painting and surface prep time on site.
- Customizable sizes – Beyond the 4x6 inch profile, we can supply other square/rectangular dimensions, wall thicknesses, and lengths upon request.
For engineering projects that require reliable performance and predictable material behavior, this ASTM A500 Grade B carbon steel tube meets or exceeds the specified mechanical properties, including minimum yield strength of 46,000 psi (315 MPa) and minimum tensile strength of 58,000 psi (400 MPa). The rectangular shape is particularly effective for columns, beams, and bracing where directional stiffness is needed. Its flat surfaces also simplify connections with brackets, gussets, and other structural components.
Our manufacturing process is monitored in-house with controlled raw material sourcing, accurate forming, stable welding, and thorough inspection. Each batch is sampled and tested to ensure straightness, weld integrity, and coating adhesion. We can provide test certificates and mill reports for your quality assurance department, subject to your requirements.
As an export-oriented company, Hemaokang Steel has an annual export value of US$50 million to US$100 million and a dedicated team of 51–100 experienced employees. Our factory is strategically located in Liaocheng, Shandong, with convenient access to Qingdao Port, which allows efficient and timely shipment to major markets across North America, South America, Europe, Southeast Asia, Africa, Oceania, the Middle East, and beyond. Since our establishment in 2025, we have built a reputation for reliable supply, consistent product quality, and responsive customer service.
Choosing our pre-galvanized ERW carbon steel rectangular tube means you benefit from a manufacturer that understands international specifications and export packaging requirements. We offer a range of logistics solutions, including container loading, bundling with protective wrapping, and custom cutting to reduce your in-house processing costs. Contact our sales team today to request a quotation, sample, or mill test certificate. We are ready to support your ongoing or upcoming projects with competitive pricing and dependable delivery.
FAQ
Q1: What is the minimum order quantity (MOQ) for the 4x6 inch ERW pipe?
Our MOQ is type-based and negotiable. For standard 6-meter lengths, we can start from 20 tons. For cut-to-length or non-standard wall thicknesses, a separate evaluation is required. Please contact us with your specific requirement.
Q2: Can you supply other sizes besides 4x6 inch?
Yes, we offer a wide range of square and rectangular profiles from 20x20 mm up to 400x200 mm, with wall thicknesses from 0.8 mm to 16 mm. Custom sizes are available upon request.
Q3: Are the pipes truly pre-galvanized, and what is the coating weight?
Our standard pre-galvanized coating is applied by either continuous hot-dip or electro-galvanizing process, with coating weight typically from 30-90 g/m² (or higher) depending on your specification. We can also supply hot-dip galvanized pipes with coating weight above 200 g/m² upon request.
Q4: Which payment terms do you support?
We work with T/T, L/C, and other flexible payment methods. For new customers, we can discuss a suitable arrangement based on order value and trade terms.
Q5: How do you ensure the quality of the steel pipe?
Our quality control covers raw material inspection, dimensional measurement during forming, weld seam testing, and final appearance checks. We hold ISO9001 certification and we can provide mill test certificates according to ASTM A500 requirements.
Q6: Do you accept third-party inspection?
Yes, we welcome SGS, BV, TUV, or any third-party inspection agency chosen by you. We can arrange the inspection before shipment and provide the necessary documents.
Q7: Can you cut the pipe to exact lengths or punch holes?
Yes, we provide cutting services with tolerances according to your drawings. We can also supply simple machining such as drilling, slotting, or chamfering to meet your fabrication needs.
Q8: How long does delivery take after order confirmation?
For standard sizes in stock, delivery is typically 1–2 weeks. For production orders, it depends on the quantity and specifications, generally 3–4 weeks after deposit receipt and drawing confirmation.
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