Seamless Steel Pipe Manufacturer & Supplier in China

Seamless Steel Pipe Manufacturer & Supplier in China

Sino East Steel Group manufactures seamless steel pipe in Tianjin for pressure and structural applications, from ASTM A106 and A53 to API 5L and EN 10210 ranges. Our seamless pipe program serves boiler fabricators, mechanical contractors and energy projects across the GCC, with sizes from small-bore tubing to 12-inch lines.

Every shipment is manufactured to ASTM A106 / ASTM A53 / API 5L, tested in our ISO 9001:2015 certified quality system, and delivered with a complete documentation set including the Mill Test Certificate (MTC) per EN 10204 3.1, commercial invoice, packing list, bill of lading and certificate of origin. Third-party inspection by SGS, BV or TUV can be arranged at the factory or the destination port.

Seamless pipe from our mill is pierced and rolled from controlled billets rather than bought in as re-traded stock, which is the difference buyers feel in uniform wall thickness and documented heat traceability. Production, testing and certification are managed in one plant, so pricing and quality accountability sit with the factory that issued the MTC.

Why Buy Seamless Steel Pipe Direct from a Chinese Factory

Importers and distributors who source seamless steel pipe directly from our factory in Tianjin benefit from the complete manufacturing chain under one roof: steel input selection, forming and production, surface treatment, quality testing, packing and export documentation. This integrated model removes trading markups and ensures that the specification approved in the quotation is the specification delivered.

• Seamless pipe produced by rotary piercing and mandrel rolling, not re-traded stock
• MTC per EN 10204 3.1 with heat numbers on every bundle
• ASTM A106, API 5L and Chinese grades 20#/45#/16Mn in one program
• Heat treatment, eddy-current inspection and hydrostatic testing per order
• Flexible terms: T/T, L/C, D/A, D/P and O/A for long-term partners
• 18-25 days sea freight to Jebel Ali, Dammam, Jeddah, Hamad Port, Shuwaikh, Sohar

Range and Specifications of Our Seamless Steel Pipe

Seamless programs are scheduled around your service condition: boiler and exchanger tube packages with exact OD/wall combinations, API 5L gathering line lots for oilfield programs, or structural seamless for fabrication. Our engineers hold the grade and heat-treatment requirement from the first inquiry, so the specification is never re-interpreted at production.

Standard	ASTM A106 / ASTM A53 / API 5L
Available Grades	ASTM A106 Grade B, ASTM A53 Grade B, API 5L Grade B
Size Range	outside diameter 1/2 inch to 24 inches, wall 2.0-25.4 mm, length 6 m / 12 m
Surface / Finish	black, varnished or oiled
Certification	ISO 9001:2015, MTC per EN 10204 3.1, SGS / BV / TUV inspection available
Packaging	Seaworthy export packing, bundled or palletized per product
MOQ	20-25 metric tons per container, mixed sizes welcomed
Production Time	15-25 days after specification confirmation
Payment	T/T, L/C, D/A, D/P, O/A

Without a longitudinal weld seam, seamless pipe provides uniform strength around the circumference, which is why pressure design codes prefer it for elevated service conditions. Each heat is hydrostatically tested and, for PSL2 or pressure-critical orders, non-destructive testing can be added per the project specification.

Every seamless shipment is tracked from the billet certificate to the destination port, and the export team prepares the documentation refineries and plant contractors expect: bill of lading, certificate of origin, MTC and, where applicable, SASO / SABER conformity for Saudi Arabia or Dubai Municipality / ESMA support for the UAE.

How to Choose a Reliable Seamless Steel Pipe Supplier in China

When sourcing seamless pipe, confirm the governing standard and grade up front, and ask whether the mill can provide traceable heat numbers with third-party inspection at the plant. Pressure piping failures trace back to undocumented material, so the certificate package is as important as the pipe itself.

• Confirm the billet source - we buy only from integrated steelmakers
• Request MTCs from recent seamless shipments with heat numbers
• Verify the grade, OD, wall and heat-treatment condition for your service
• Agree on end preparation, threading and marking in writing
• Start with one heat or one project lot before scaling the program

This five-point checklist has helped distributors and contractors across the GCC, Africa and Southeast Asia select the right seamless steel pipe partner on their first attempt, avoiding the quality and documentation problems that are common when sourcing through intermediaries.

Global Seamless Pipe Supply and Gulf Export Coverage

Seamless pipe is specified where pressure integrity matters: steam and boiler systems, hydraulic lines, heat exchangers, process piping in refineries and power plants, and mechanical tubing for cranes and heavy equipment. For maintenance and shutdown projects in Saudi Arabia and the UAE, we keep fast-turnaround schedules on common sizes so contractors do not wait weeks for a single replacement line.

Sino East Steel operates dedicated production lines for seamless steel pipe within a 65,000 m2 plant in Daqiuzhuang Industrial Park, Jinghai District, Tianjin. The annual capacity of 500,000 metric tons across all product lines allows the factory to serve distributors, contractors and project companies with stable supply for both container shipments and project-scale tonnages.

Our principal export markets are the Middle East and GCC countries, including the United Arab Emirates, Saudi Arabia, Qatar, Kuwait, Oman and Bahrain, where seamless steel pipe is used in construction, infrastructure, energy and industrial projects. We also export to Africa, Southeast Asia, Central Asia and Latin America, supported by shipping programs to the main ports in each region.

Monthly seamless export programs cover the sizes Gulf process industries consume: from 1/2 inch to 24 inch in ASTM A106 Grade B, API 5L Grade B to X70, and Chinese grades 20#/45#/16Mn for structural and mechanical service. Repeat buyers get priority scheduling, stable pricing and consolidated freight to Gulf ports.

• Monthly rolling production plans reserve capacity for scheduled deliveries
• Container consolidation programs combine seamless steel pipe with other product lines
• Dedicated export team with multi-market documentation experience
• Distribution agreements and exclusive-territory arrangements available

Seamless Sourcing: Billet Control from Steelmaker to Mill

For seamless pipe, the sourcing chain is the billet: we keep billet certificates in the quality file and trace every finished pipe back to its heat. That single-file traceability is what lets us issue a clean MTC per EN 10204 3.1 for refinery and oilfield programs.

• Billets sourced from integrated steelmakers under long-term agreements
• Rolling capacity reserved for contract and project volumes
• Pre-shipment inspection by SGS, BV or TUV at the factory or destination
• Heat-number traceability from billet certificate to finished pipe
• Quarterly price reviews for process industry buyers
• Consolidated logistics for multi-grade seamless orders

Seamless Pipe Quality Control, Certification and Factory Audit

Seamless production runs under the ISO 9001:2015 system, with every heat sampled for chemical analysis, tensile and hardness, plus flattening and hydrostatic tests on the finished pipe. Where the service condition requires it, heat treatment is performed and verified, and eddy-current inspection covers the full pipe length before release.

For refinery, boiler and oilfield projects we host factory audits and witness testing by client representatives and third parties - SGS, Bureau Veritas or TUV - before loading. Documentation can be prepared to satisfy SASO / SABER conformity for Saudi Arabia and Dubai Municipality / ESMA requirements for the UAE.

Sino East Steel Group has supplied seamless pipe to Gulf refineries, power plants and oilfield service companies since 2008, with material rolled in our own mill rather than sourced from third-party stocks. For new buyers we provide reference lists, sample pipe sections, trial-order guidance and inspection arrangements.

Seamless Pipe Technical Support, Samples and After-Sales Service

Our engineers review every seamless inquiry against the governing standard and confirm the grade, OD, wall, length, end preparation and heat-treatment condition in writing before production. For boiler and exchanger tube programs we confirm the exact OD/wall combination and length schedule up front.

• Written confirmation of grade, OD, WT, length and end preparation
• MTC per EN 10204 3.1 with heat numbers on every shipment
• Pre-production samples of bevel, thread or surface finish
• After-sales support for documentation, claims and repeat programs

Export Experience: Seamless Steel Pipe to 50+ Countries

Since 2008, Sino East Steel has supplied seamless steel pipe to more than 50 countries, with particular strength in the Middle East, Africa and Southeast Asia. Our export team understands the documentation, packaging and logistics requirements of each destination market: high-pressure steam and process piping, boilers, hydraulic lines, oil and gas gathering lines and power plants.

Whether you are a process plant contractor ordering by the project, a distributor building seamless inventory, or an oilfield supplier procuring for a gathering line program, you get the same factory service: specification lock, production scheduling with weekly progress, pre-shipment inspection options and complete export documentation on arrival.

Seamless pipe shipping documents are prepared for the destination customs authority and the buyer, including attested certificates of origin where required. The export team provides the arrival documentation set - invoice, packing list, bill of lading and MTC - before the vessel reaches the Gulf port.

Seamless Pipe Quotation, Pricing and Contract Terms

Quotations for seamless pipe are prepared within 24 hours and include the FOB or CIF unit price by grade and size, delivery time, packing details, documentation list and payment terms. For process industry buyers we offer tiered pricing by volume and quarterly contract rates with capacity reservation.

• FOB Tianjin, CIF, CFR or DDP delivery terms to Gulf ports
• T/T, L/C, D/A, D/P and O/A payment options
• Volume-based pricing tiers for plant contractors and distributors
• Long-term supply agreements with rolling capacity reservation

All seamless quotations are valid for 15 days and itemize the standard, grade, OD, wall, length, end preparation, quantity, packing, lead time and shipping terms. Contract volumes are covered by a supply agreement that fixes the heat-treatment and inspection requirements for the whole program.

How to Order Seamless Steel Pipe as an Importer

1. Send your seamless standard, grade, OD, wall, length and destination port
2. Receive a formal quotation with delivery time and shipping options within 24 hours
3. Confirm the specification in writing; rolling starts after order confirmation
4. Track your shipment with full export documentation until arrival at the destination port

Frequently Asked Questions about Our Seamless Steel Pipe Supply

1. Can your factory supply seamless pipe with third-party inspection?

Yes, SGS, BV or TUV inspection can be arranged at the factory before loading or at the destination port, which is a common requirement for oil, gas and power projects.

2. How do you guarantee the quality of seamless pipe?

Every heat is tested for chemistry and mechanical properties, and every pipe is hydrostatically tested and dimensionally inspected. The MTC per EN 10204 3.1 documents heat number, chemistry and mechanical values for full traceability.

3. What is your minimum order quantity?

The MOQ is typically 25 metric tons per size for most products, with mixed-size container loads of 20 or 40 feet welcomed for distributors. Sample orders for project approval can be arranged.

4. What are your payment terms?

We accept T/T, L/C, D/A, D/P and O/A for long-term partners, with payment terms confirmed in the quotation for each order.

5. What is your production and shipping lead time?

Production takes 15-25 days after confirmation of the specification, followed by 18-25 days sea freight to the main GCC ports: Jebel Ali, Dammam, Jeddah, Hamad Port, Shuwaikh and Sohar.

6. Can third-party inspection be arranged?

Yes, inspection by SGS, BV or TUV can be arranged at the factory before loading or at the destination port upon arrival, which is a common requirement for project supply.

7. Do you support OEM and customized requirements?

Yes, we support OEM orders including custom sizes, finishes, packing marks and documentation, subject to MOQ. Custom packaging and labeling to the importer’s specification are available for distributor brands.

8. How do you ensure on-time delivery?

Production capacity is reserved when the order is confirmed, production progress is reported weekly, and shipments are coordinated with freight forwarders in advance. Our on-time delivery record to the Middle East since 2008 is the basis of our long-term relationships with distributors.

9. How do I request a quotation?

Send your requirement to paul@sinoeaststeel.com or message us on WhatsApp at +86 186 2208 8833. Our sales team replies within 24 hours.

10. Which seamless pipe grades are stocked or regularly scheduled?

We regularly produce ASTM A106 Grade B, A53 Grade B, API 5L Gr. B and X42-X60, plus EN 10210 S355J2H for structural use. Other grades are confirmed against the governing standard before scheduling.

11. Can you supply seamless pipe with IBR or ASME certification?

We support project-specific documentation, including material certificates with test values, and can coordinate IBR/ASME-related paperwork or third-party inspection where the destination authority requires it.

12. What lengths and end finishes are available?

Standard lengths are 6 m and 12 m, with plain, beveled or threaded ends per your specification. Random lengths for project cutting efficiency can be arranged on request.

Explore Our Seamless Steel Pipe Range

Browse the full seamless steel pipe product range supplied by our factory: Seamless Steel Pipe category.

• ASTM A106 Grade B Seamless Steel Pipe
• ASTM A53 Grade B Seamless Steel Pipe
• Seamless Steel Pipe SCH40
• Seamless Carbon Steel Pipe

Seamless Pipe Production: Rotary Piercing to Final Testing

Seamless steel pipe from our mill starts as a solid round billet, pierced at high temperature and progressively rolled through the mandrel mill before sizing, straightening and finishing. Because there is no longitudinal weld, the pipe offers uniform strength around the circumference - the reason seamless is specified for pressure service in refineries, boilers and oilfield flowlines.

The billet source is controlled: we buy billets only from integrated steelmakers and keep the billet certificates in the quality file, so every finished pipe can be traced back to its heat. After rolling, the pipe passes through heat treatment where required, then eddy-current inspection and hydrostatic testing before cutting and end preparation.

Service Conditions and Grade Selection

• ASTM A106 Grade B - the standard choice for high-temperature process piping
• API 5L Grade B to X70 - seamless line pipe for oil and gas gathering and transmission
• Chinese grades 20#, 45#, 16Mn - economical options for structural and mechanical service
• End preparation - plain, beveled or threaded ends per project specification

For boiler and exchanger tube programs we can supply to the exact OD/wall combination and length schedule, with positive material identification and full traceability documentation.