Seamless Steel Pipe
Seamless carbon steel pipe per ASTM A106, ASTM A53, API 5L for high-pressure and high-temperature service.
Seamless Steel Pipe Manufacturer and Supplier for Oil, Gas and Power Projects in the Middle East
Seamless steel pipe is produced by piercing a solid round billet and rolling it into a hollow pipe without any longitudinal weld seam. Tianjin Sino East Steel Group supplies seamless steel pipes in API 5L, ASTM A106 Grade B and ASTM A53 Grade B specifications to oil and gas companies, EPC contractors and distributors across the GCC. As a factory-direct seamless pipe supplier to the Middle East, we provide certified material with complete documentation for every project.
What Is Seamless Steel Pipe?
Seamless pipe is manufactured without welds, which gives it uniform strength in all directions and makes it the preferred choice for high-pressure, high-temperature and corrosive applications. The manufacturing process begins with a solid round billet of carbon or alloy steel, which is heated, pierced and rolled into a tube. Because there is no weld seam, seamless pipe can withstand higher internal pressure and is widely used in oil and gas transmission, refinery piping, boiler tubes, heat exchangers and high-rise plumbing systems.
Seamless pipe is available in various schedules - SCH20, SCH40, SCH80, SCH160 - which define the wall thickness for a given nominal pipe size. SCH40 is the most common schedule for general pressure applications.
Standards and Specifications
Our seamless pipes are manufactured to API 5L (PSL1 and PSL2), ASTM A106 Grade B, ASTM A53 Grade B and DIN/EN specifications. Popular products in this category include:
- ASTM A106 Grade B Seamless Steel Pipe - the standard high-temperature service seamless pipe
- Seamless Steel Pipe API 5L / ASTM A53 Grade B - dual-certified pipe for line and mechanical service
- Seamless Steel Pipe SCH40 API 5L Grade B / ASTM A53 Grade B - SCH40 wall, black painted with API marking
- Seamless Carbon Steel Pipe - general carbon steel seamless pipe for industrial applications
- Seamless Carbon Steel Structural Pipe - structural seamless pipe for columns and heavy supports
- ASTM A53 Grade B Seamless Steel Pipe Hot Rolled - hot-rolled seamless pipe in Grade B
- Seamless Steel Irrigation Pipe A106 Gr.B - agricultural irrigation pipe with high strength
- Seamless Steel Pipe - complete range of sizes and schedules
Available specifications:
- Outside diameter: 21.3 mm - 406.4 mm (1/2" - 16")
- Wall thickness: 2.0 mm - 40 mm
- Schedule: SCH20, SCH40, SCH60, SCH80, SCH160
- Length: 5.8 m, 6 m, 12 m or random lengths
- Ends: plain, beveled or threaded
- Tests: hydrostatic, ultrasonic, tensile, impact (optional)
Applications Across the Middle East
- Oil and gas: flow lines, gathering lines and transmission pipelines (API 5L)
- Refineries and petrochemicals: process piping, furnace tubes and heat exchanger tubes
- Power generation: boiler tubes and steam lines in power and desalination plants
- Water and irrigation: high-pressure water lines and agricultural irrigation systems
- Construction: structural columns and piling where weld integrity is critical
- Mechanical engineering: hydraulic cylinders, shafts and machine components
Why Buy Seamless Pipe from Sino East Steel?
Sino East Steel is a direct manufacturer with 18+ years of steel export experience and an annual capacity of 500,000 metric tons. Our seamless pipe production follows strict quality control - each pipe is 100% ultrasonic or hydrostatic tested, and the mill is ISO 9001 certified. Every shipment is accompanied by an EN 10204 3.1 Mill Test Certificate showing chemical composition, mechanical properties and heat number traceability, which is mandatory for oil and gas projects in the GCC.
We offer competitive factory pricing for both project-based and stock-based procurement, and our export team can arrange SGS or Bureau Veritas third-party inspection before shipment if required by your contract.
Shipping and Delivery
Seamless pipe is shipped in bundles with protective end caps, or in wooden crates for large diameters and premium finishes. We deliver to Jebel Ali, Khalifa Port, Dammam, Jeddah, Hamad Port, Shuwaikh and Sohar with a production lead time of 15 to 25 days plus 18 to 25 days of sea freight.
Frequently Asked Questions
What is the difference between API 5L and ASTM A106 seamless pipe?
API 5L is the specification for line pipe used in oil and gas pipelines, available in grades X42 to X70. ASTM A106 Grade B is the specification for high-temperature service pipe used in refineries and power plants. Both are seamless carbon steel pipes but with different testing and marking requirements.
Can you supply seamless pipe with SCH80 wall thickness?
Yes. We supply seamless pipe in schedules from SCH20 to SCH160, with SCH40 and SCH80 available from stock in popular sizes.
Do you provide third-party inspection reports?
Yes. We can arrange inspection by SGS, Bureau Veritas, TUV or Intertek before shipment, and the inspection report is included with the shipping documents.
What is the minimum order quantity for seamless pipe?
For standard sizes and grades we can supply from 10 metric tons. Mixed-schedule container orders are welcome for distributors.
Can seamless pipe be supplied with black painting and API marking?
Yes. We supply seamless pipe with black paint finish and API 5L marking (grade, heat number, standard) as required for line pipe applications.
Request a Seamless Steel Pipe Quotation
Send your required standard (API 5L / A106 / A53), grade, size, schedule and quantity. Our team will reply with a factory-direct quotation within 24 hours.
Product Range and Available Sizes
Seamless pipe is available across the pressure and structural range:
- API 5L Grade B to X70 seamless line pipe in PSL1 and PSL2
- ASTM A106 Grade B seamless pipe for high-temperature service
- Schedules SCH20 to SCH160 with black paint and API marking options
- Diameters from 21.3 mm to 406.4 mm with plain or beveled ends
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.