Welded Steel Pipe
ERW welded carbon steel pipe per ASTM A53, EN 10219 for structural, plumbing and mechanical applications.
Welded Steel Pipe (ERW) Manufacturer and Supplier for the Middle East
Welded steel pipe, also known as ERW (electric resistance welded) pipe, is produced by forming hot-rolled steel strip into a cylindrical shape and welding the seam using high-frequency electric resistance. Tianjin Sino East Steel Group is a direct welded steel pipe manufacturer supplying ASTM A36, ASTM A53 and ASTM A500 welded pipes to the GCC construction, water and energy markets. If you need an ERW steel pipe supplier in UAE, Saudi Arabia, Qatar or Kuwait, our factory delivers consistent quality with MTC certification on every batch.
What Is Welded Steel Pipe?
ERW welded steel pipe is the most economical type of steel pipe for general-purpose applications. Compared with seamless pipe, welded pipe offers tighter dimensional tolerances, a smoother surface and lower cost, while modern high-frequency welding provides seam strength comparable to the parent metal when properly heat-treated. ERW pipe is manufactured in sizes from 1/2 inch to 24 inches and is widely used for water lines, gas distribution, structural members, scaffolding and general fabrication.
Welded pipe can be supplied in black (mill finish) or galvanized form. Black welded pipe is the base product, while galvanized welded pipe adds a zinc coating for corrosion resistance in exposed and wet environments. Both forms are available from stock or produced to order.
Standards and Specifications
Our welded pipes comply with ASTM A36/A36M, ASTM A53/A53M Grade A and B, ASTM A500 and EN 10219. Popular products in this category include:
- ASTM A36 ERW Black Steel Pipe - the general-purpose structural pipe for fabrication and construction
- ASTM A36 ERW Structural Steel Pipe - higher-strength structural quality for frames and supports
- ASTM A36 ERW Structural Pipe 2 1/2 inch - popular mid-size for water and gas lines
- ASTM A53 Welded Steel Pipe - the most specified pipe standard for plumbing and mechanical systems
- ASTM A53 Grade B Threaded Black Steel Pipe - threaded ends with couplings for quick installation
- ASTM A53 Galvanized ERW Steel Pipe - zinc-coated welded pipe for corrosive environments
- ASTM A36 Carbon Steel Welded Pipe - carbon steel welded pipe for structural and general use
- Black Steel Pipe - mill-finish ERW pipe for fabrication and industrial applications
Available specifications:
- Outside diameter: 21.3 mm - 609.6 mm (1/2" - 24")
- Wall thickness: 1.0 mm - 12.7 mm
- Length: 5.8 m, 6 m, 12 m or custom
- Ends: plain end, beveled end, threaded, grooved
- Surface: black (oiled), bare, or galvanized
- Testing: hydrostatic, flattening, bend and tensile tests
Applications Across the GCC
- Water transmission: welded pipe for municipal water supply and irrigation networks
- Construction: structural supports, bracing and columns in buildings and warehouses
- Scaffolding: ERW tubes for frame and system scaffolding in construction projects
- Fencing and gates: welded pipe for perimeter fencing, posts and barriers
- Mechanical and industrial: machine frames, conveyors and process equipment
- Oil and gas: low-pressure gathering lines and surface piping (black pipe)
Why Buy Welded Pipe from Sino East Steel?
Sino East Steel operates multiple high-frequency ERW production lines in Tianjin with an annual capacity of 500,000 metric tons. Our welded pipe is produced from prime hot-rolled strip with 100% on-line weld inspection, and finished pipes undergo hydrostatic testing and dimension checks before packing. The factory is ISO 9001 certified and every shipment includes an EN 10204 3.1 Mill Test Certificate, which is essential for project approvals and quality audits in the Gulf region.
With 18+ years of steel export experience and regular sales to more than 50 countries, we understand the documentation and packaging requirements of GCC buyers. We offer competitive factory pricing, mixed-container loading for multiple sizes, and responsive after-sales support from our export team.
Shipping and Delivery
Welded steel pipe is bundled, strapped and loaded in seaworthy containers or open-top units. We ship to all major Gulf ports, including Jebel Ali, Khalifa Port, Dammam, Jeddah, Hamad Port, Shuwaikh and Sohar. Standard production time is 15 to 25 days, with sea freight of approximately 18 to 25 days to the Gulf.
Frequently Asked Questions
What is the difference between welded pipe and seamless pipe?
Welded (ERW) pipe has a longitudinal weld seam and is more economical, with tighter tolerances. Seamless pipe has no seam and offers higher pressure ratings, making it suitable for high-pressure and high-temperature applications. For most construction and water applications, welded pipe provides the best value.
Can you supply welded pipe with threaded ends?
Yes. We can supply threaded and coupled black or galvanized welded pipe from 1/2" to 4", packed in wooden crates to protect the threads.
Do you supply black steel pipe for welding on site?
Yes. Black steel pipe with plain or beveled ends is available for site welding, in standard and custom lengths.
What is the difference between ASTM A36 and ASTM A53 pipe?
ASTM A36 is a structural steel specification suitable for welding, while ASTM A53 is a pipe-specific specification covering mechanical properties and testing requirements for pressure applications. Both are commonly available from our factory.
What documents do you provide with welded pipe shipments?
Each shipment includes an EN 10204 3.1 Mill Test Certificate, packing list, commercial invoice, certificate of origin and, on request, a fumigation certificate for the timber packaging.
Request a Welded Steel Pipe Quotation
Send your required size, wall thickness, length, ends and quantity. Our team will reply with a factory-direct quotation within 24 hours.
Product Range and Available Sizes
ERW welded pipe is available in standard structural and mechanical specifications:
- ASTM A36 and ASTM A53 ERW pipe from 1/2 inch to 24 inches outside diameter
- Black, painted and galvanized surface options
- Plain, beveled, threaded and grooved end preparations
- Standard 6 m and 12 m lengths with custom cutting available
Quality Control and Testing
All products are manufactured and tested under our ISO 9001:2015 certified quality management system. Our in-house laboratory performs chemical analysis, tensile testing, bend testing and dimensional inspection on every production batch, and each shipment is accompanied by an EN 10204 3.1 Mill Test Certificate (MTC). For project-critical orders, we can arrange third-party inspection by SGS, Bureau Veritas, TUV or Intertek at the buyer's request, with inspection reports included in the shipping document set.
Traceability is maintained from the original heat number to the finished product, which is essential for project approvals, quality audits and long-term warranty claims in the Gulf region. We encourage new buyers to request samples and test reports before placing bulk orders.
How to Place an Order with Sino East Steel
- Send your inquiry: specify the product, grade, standard, size, quantity and destination port through the contact form or WhatsApp.
- Receive a quotation: our export team replies within 24 hours with current factory pricing and a confirmed delivery schedule.
- Confirm the order: standard terms are 30% T/T deposit with 70% balance before shipment, or an irrevocable L/C at sight. Production is scheduled after the deposit is received.
- Production and inspection: manufacturing takes 15 to 25 days depending on the product and quantity. Photos, videos and third-party inspection can be arranged during production.
- Shipment: we arrange sea freight to your nominated Gulf port and provide the complete document set - commercial invoice, packing list, bill of lading, MTC, certificate of origin and insurance certificate.
Minimum order quantities are typically 10 to 20 metric tons for standard sizes, with mixed-size container loading available for distributors. We are happy to discuss MOQ flexibility for new customers and trial orders, and we accept payments via T/T, L/C, Western Union and other agreed methods.
Why the Middle East Chooses Sino East Steel
Sino East Steel Group operates from a 65,000 m² production base in Daqiuzhuang Industrial Park, Jinghai, Tianjin - one of China's largest steel manufacturing clusters. With more than 18 years of export experience, 500,000 metric tons of annual capacity and regular customers in over 50 countries, we combine manufacturing scale with deep market knowledge of the GCC construction and energy sectors.
Our export team provides English-language technical support, and we maintain regular shipping schedules to all major Gulf ports including Jebel Ali, Khalifa Port, Dammam, Jubail, Jeddah, Hamad Port, Shuwaikh and Sohar. As a direct factory, we offer the most competitive pricing without intermediary margins, and our after-sales team responds to technical and documentation queries quickly.
Buyers are welcome to visit our factory in Tianjin or request a virtual factory tour. We regularly exhibit at Middle East industry events and welcome long-term cooperation with distributors, contractors and engineering companies.
Do you offer technical support after purchase?
Yes. Our engineers provide specification guidance, installation advice and document support for the lifetime of the order. We also welcome feedback that helps us improve product quality and service.
Packaging, Payment Terms and Delivery
Every order is packed in seaworthy export packaging designed for long sea voyages to the Gulf: products are wrapped with waterproof or VCI-treated film, protected with edge guards and fixed on pallets, skids or in wooden crates, with fumigation certificates provided where required. The packaging standard can be adjusted for your handling equipment - for example, open-top containers for pipe bundles or flat-rack containers for long profiles.
Standard payment terms are 30% T/T deposit with 70% balance paid against a copy of the bill of lading, or an irrevocable L/C at sight for larger project orders. We can also accept other agreed payment methods for established customers. Typical minimum order quantities range from 10 to 20 metric tons depending on the product, and mixed-size or mixed-product container loading is welcome for distributor orders.
Our export department issues complete English documentation with every shipment: commercial invoice, packing list, bill of lading, EN 10204 3.1 Mill Test Certificate, certificate of origin and insurance certificate. This documentation set is prepared to meet the customs and authority requirements of each GCC country, saving you time at the port of destination.
What Incoterms can you provide?
We quote FOB Tianjin, CFR and CIF to any Gulf port, and DDP door-to-door for container shipments. Our logistics team can recommend the most cost-effective shipping option for your quantity and destination.
Can we receive samples before placing a bulk order?
Yes. Small samples can be shipped by express courier (DHL, FedEx or UPS) for your evaluation, with the sample cost refunded against your first order.
Do you offer regular supply contracts for distributors?
Yes. We welcome annual supply agreements with fixed pricing and delivery schedules, and we prioritize production slots for contract customers during peak seasons.