Seamless Steel Pipe

For high-pressure, high-temperature and process-critical applications, Polish engineering firms and industrial buyers need a seamless steel pipe supplier who can guarantee traceability and certification. Sino East Steel is a seamless pipe manufacturer and factory producing ASTM A106, ASTM A53 and API 5L seamless pipe in grades A, B and C, with wall thicknesses and diameters matched to your pressure class. Because we are the manufacturer, we can offer mill-direct pricing, EN 10204 3.1 mill certificates with heat numbers, and technical support from engineers who understand European standards and Polish project requirements.
Seamless Steel Pipe — No Weld, Maximum StrengthSeamless steel pipe is formed from a solid round billet, which is heated, pierced and rolled into a pipe without any longitudinal weld. Because there is no weld seam, the pipe offers uniform strength around the full circumference, making it the preferred choice for high-pressure, high-temperature and critical-duty applications. Sino East Steel supplies seamless pipe in carbon steel grades to ASTM A106, ASTM A53, API 5L, DIN 1629, EN 10216 and GB standards, with outside diameters from 21.3 mm to 610 mm and wall thicknesses up to 60 mm. The range covers both hot-finished and cold-drawn pipe, so engineers can select the dimensional tolerance class their application needs.
Manufacturing and TestingSeamless pipe production begins with continuous casting of billets, which are reheated and pierced on a rotary piercing mill to form a hollow shell. The shell is then elongated and sized on mandrel or plug mills, and cold-drawn versions receive additional cold working and heat treatment for tighter dimensions and improved mechanical properties. Final quality checks include hydrostatic testing, ultrasonic inspection, eddy current testing and dimensional verification, with results reported on the mill certificate for full traceability from billet heat number to finished pipe.
ApplicationsSeamless pipe is specified wherever weld integrity cannot be risked: high-pressure steam and hot water boilers, power plants, refinery and petrochemical process lines, hydraulic cylinders, machine-building components and offshore structures. In Poland and the EU it is widely used by mechanical engineering companies, boiler makers, HVAC contractors and maintenance teams who need certified material with documented mechanical values for every heat.
Selecting the Correct GradeFor boiler and heat exchanger service choose ASTM A106 Grade B or C, or EN 10216-2 P235GH, P265GH and 16Mo3 for elevated temperatures. For general mechanical and structural duty, ASTM A53 Grade B and DIN 1629 St37 are economical standard choices. If the pipe will be used in hydraulic cylinders, cold-drawn honed or skived pipe (St52 / E355) with tight tolerances is the right specification — mention the intended machining process when you request a quote.
Standards, Grades & Equivalents

StandardGradeTypical Use
ASTM A106A, B, CSeamless carbon steel, high temperatureASTM A53A, BSeamless and welded, black or galvanizedAPI 5LB – X70Seamless line pipeEN 10216-1/2P235TR1 – P355GHPressure purposesDIN 1629St37, St44, St52Mechanical and general serviceGB/T 8163 / 816220#, 45#, Q345Fluid and structural use
Available Sizes & Range

ItemRangeNotes
Hot-finished21.3 – 610 mmWT 2.5 – 60 mmCold-drawn6 – 168 mmWT 1 – 20 mmLength5.8 – 12.2 mrandom or fixed
Specification Deep-Dive for Seamless Steel PipeSeamless pipe is produced by piercing a solid billet, which means the pipe body has no weld seam — the main reason it is specified for high-pressure steam, boiler and process service. Grades A, B and C cover increasing tensile strength: Grade B offers 415 MPa minimum tensile with 240 MPa yield, while Grade C reaches 485 MPa tensile, suitable for higher design stresses in heat exchangers and boiler systems. Wall thickness schedules from SCH10 to SCH160 and diameters from 21.3 mm to 610 mm are available, with plain, bevelled or threaded ends. Testing includes hydrostatic pressure testing of every length, plus optional ultrasonic or eddy-current inspection per ASTM E213 or E309 for critical service. Heat treatment (normalizing) is applied per the standard to guarantee stable mechanical properties. For Polish energy and chemical plant projects we document each batch with EN 10204 3.1 certificates including heat number, chemistry, tensile and hardness results, and we can arrange third-party inspection before shipment so your engineering contractor receives verified material on arrival.
Ordering Seamless Pipe for Industrial ProjectsFor seamless pipe, specify the standard (ASTM A106, ASTM A53, API 5L or EN 10216), grade, outside diameter, wall thickness or schedule, length and end preparation. Our engineers confirm the correct specification for your pressure and temperature conditions, then quote with lead time and mill certificate availability. Hydrostatic and NDT test reports are included in the documentation set.
Quality Control & CertificationEvery batch of material delivered from our Tianjin plant passes through a documented inspection routine: chemical composition analysis, tensile and yield testing, dimensional checks and, where applicable, hydrostatic or flattening tests. Each consignment ships with an EN 10204 3.1 mill test certificate (MTC) and batch traceability records, so your incoming inspection at Gdansk, Gdynia, Szczecin or any other EU port is straightforward. The factory operates under an ISO 9001:2015 quality management system and is independently audited by SGS and TUV Rheinland for production capacity and export reliability.
Export Documentation IncludedEvery order is shipped with a complete documentation set: commercial invoice, packing list, bill of lading, certificate of origin, and the EN 10204 3.1 mill test certificate with heat numbers and test results. Where your project requires third-party inspection, we can arrange SGS, TUV or Bureau Veritas inspection before loading, with the inspection report issued in English for easy clearance in the EU.
Why European Buyers Source This Product from Sino East SteelImporting steel from China to Poland is a routine, well-understood process when you work with a manufacturer that has done it hundreds of times. Sino East Steel combines factory-direct pricing with export experience across the EU, so you avoid the margin stack of trading companies and the documentation delays that slow down first-time imports. Our export team prepares commercial invoices, packing lists, certificates of origin, and the EN 10204 3.1 mill certificates your quality department and customs broker expect. We also coordinate vessel booking from Tianjin/Xingang to Baltic ports, and for regular customers we can hold production slots so repeat orders keep your warehouse stocked without interruption.Because we are the manufacturer, specification changes, coating requirements, packing instructions and delivery dates are agreed directly with the people who control the production line. This transparency is what distributors and contractors in Poland value most: one accountable partner, one set of documents, and material that matches the sample on every shipment.
Packaging & Delivery to Poland and the EUProducts are packed in seaworthy export condition: steel strapping, waterproof wrapping, and wooden or steel pallets where required, with clear marking for safe handling. For pipe and tube orders we use the standard export bundle format with plastic end caps on request. Sea freight to Polish and Baltic ports (Gdansk, Gdynia, Szczecin, Klaipeda) is arranged from Tianjin or Xingang port, with typical lead times of 15–25 days after production. FCL and LCL options are both available, and mixed-container consolidation is offered for regular customers who combine several product lines in one delivery.
Customization & Value-Added ServicesBeyond standard supply, our finishing lines can prepare material for your exact production step: cutting to length, drilling, bevelling, threading, coating, marking and custom bundling per your drawings. Packaging can be adapted to your handling equipment — pallets, frames, slings or individual protective wrapping — and private labeling is available for distributors who resell under their own brand. For customers with regular monthly programs, we schedule production slots so that reorder quantities arrive on time, allowing you to run leaner stock without risking supply gaps on your own production line.
Technical Support & After-Sales ServiceOur export engineers support you from specification to installation: confirming grade and size selections, advising on coatings and packing for your climate and handling equipment, and answering technical questions from your quality department. After delivery, we keep the batch records on file and can issue additional documentation, arrange replacement paperwork, or support you in the rare case of a claim. For Polish customers this means a single point of contact who knows your orders, your specifications and your delivery history — service that trading intermediaries rarely match.
Inspection & Testing Before ShipmentBefore any material leaves the plant it passes through a defined inspection gate. Dimensional checks are performed against the ordered specification, surface quality is inspected visually and with instruments where required, and the relevant mechanical and chemical tests are verified against the mill certificate. For pipe and tube products, hydrostatic and non-destructive testing results are reviewed against the standard’s acceptance criteria. Customers who request it can witness the inspection or receive photographs and video of the loaded goods before the vessel sails — a practical way to build confidence without travelling to China.
How to Order & Request a QuotationTo receive a firm quotation, please send your required specification: grade and standard, dimensions, quantities (in tons or pieces), end use, and the destination port in Poland or the EU. Our export team replies within 24 hours with pricing, availability and a proposed shipping schedule. We work with T/T and L/C payment terms, and for established EU customers longer payment arrangements can be discussed on a project basis.Request a quote: use the contact form, WhatsApp +86-186-2208-8833, or email [email protected].
Frequently Asked Questions
What is the difference between seamless and welded pipe?Seamless pipe has no longitudinal weld and offers uniform strength around the circumference, which is why it is required for high-pressure and high-temperature service. Welded pipe is more economical for large diameters and non-critical duty. Many standards allow either route, and the choice depends on the design code and service conditions.
Can you supply seamless pipe with EN 10204 3.1 certificates?Yes, every seamless pipe shipment is accompanied by an EN 10204 3.1 mill test certificate stating chemical composition and mechanical properties, plus the results of the hydrostatic and NDT tests.
What is the difference between ASTM A106 and ASTM A53 seamless pipe?A106 is a high-temperature carbon steel specification with tighter chemistry and mandatory hydrostatic testing, commonly used in boilers and process plants. A53 covers both welded and seamless pipe for general pressure service. We supply both with full mill documentation.
Can you provide seamless pipe with 100% ultrasonic testing?Yes. Ultrasonic, eddy current and hydrostatic testing are available per the standard and your project requirements, with test reports included in the EN 10204 documentation.
What documents do you provide with each shipment?Each shipment includes the EN 10204 3.1 mill test certificate, packing list, commercial invoice and bill of lading. Inspection reports and third-party certificates (SGS, TUV, Bureau Veritas) can be arranged before loading if your project requires them.
Can you supply to Polish and European standards?Yes. We regularly export to EN and DIN specifications used across the EU, including EN 10219, EN 39, EN 10210, EN 10305 and DIN 2440, in addition to ASTM and API standards. Tell us the standard your project specifies and we will quote accordingly.
What are your MOQ and lead times?MOQ depends on the product and size — typically from 1 to 10 tons for standard lines. Production and shipping to Polish ports normally takes 15–25 days from order confirmation.
Do you ship to Polish ports and handle customs paperwork?Yes. We ship FOB Tianjin/Xingang, CIF or CFR to Gdansk, Gdynia, Szczecin and other Baltic ports, and we prepare the export documentation (commercial invoice, packing list, bill of lading, certificate of origin, mill certificates) needed for import clearance in Poland.
Can we arrange a pre-shipment inspection?Yes. Third-party inspection by SGS, TUV, Bureau Veritas or your own representative can be arranged before loading, and the inspection report is provided before the vessel departs.
Do you offer samples before a full order?For most products we can provide small samples or cut pieces so your quality department can verify the material. Sample cost is credited against the first order for regular customers.
About Sino East Steel — Sino East Steel is a factory-direct manufacturer and exporter of carbon steel, galvanized steel and structural steel products, operating from a 65,000 m² production base in Tianjin, China. Since 2005 the company has built a steady export record across Europe, the Middle East and the Americas, supplying distributors, contractors and engineering companies that require consistent quality, complete documentation and dependable delivery. For Polish buyers, this means a single certified source for pipes, coils, sheets, bars and structures, with every shipment supported by mill test certificates and traceable batch records.
Sourcing This Product from China to Poland — What to ExpectImporting steel from China to Poland is a standard, well-documented process when the manufacturer manages it end to end. After you confirm the specification, we issue a proforma invoice with price, production time and shipping terms (FOB Tianjin/Xingang, CIF or CFR to Gdansk, Gdynia, Szczecin or Klaipeda), produce and inspect the material, prepare the full export documentation set, and book the vessel. Total lead time from order confirmation to arrival at a Polish port is typically 15–25 days for standard products. Polish importers pay import VAT and customs duties at the EU border using the commercial invoice, packing list and certificate of origin we provide; the EN 10204 3.1 mill certificates satisfy your quality department and any project documentation requirements. For first orders we recommend a trial container with the most popular sizes, so you can verify material, documents and delivery performance before committing to a larger supply program.