Welded Steel Pipe

Finding a welded steel pipe supplier in Poland with stable mill capacity and complete documentation is the key to keeping construction and industrial projects on schedule. Sino East Steel manufactures ERW and LSAW welded pipe as a certified factory and exporter, producing ASTM A53, ASTM A36 and EN 10219 welded pipe for general piping, structural frames, fencing, piling and large-diameter transmission projects. As the manufacturer, we quote mill prices, guarantee the weld quality with NDT and hydrostatic testing, and ship seaworthy bundles to Baltic ports within 15–25 days of order confirmation.
ERW & LSAW Welded Steel Pipe — Cost-Efficient and ReliableWelded steel pipe offers the economy of coil- or plate-based production with the strength needed for the majority of industrial, structural and fluid-handling applications. The two main production routes are ERW (electric resistance welding), formed from hot-rolled coil and welded by high-frequency current, and LSAW (longitudinal submerged arc welding), formed from steel plate and welded under flux. Sino East Steel supplies welded pipe in diameters from 21.3 mm to 2,500 mm, with wall thicknesses from 2 mm to 40 mm, to ASTM A53, ASTM A252, API 5L, EN 10219, EN 10217 and GB standards. For Polish distributors and contractors, welded pipe is the most flexible product line because it can be produced in long lengths and in the exact diameters used in construction and infrastructure projects.
ERW and LSAW ProductionIn the ERW process, steel strip is uncoiled, roll-formed into a cylinder and welded along the seam with high-frequency induction, then sized and straightened. The weld area is normalized to restore ductility, and the pipe is tested by eddy current or ultrasonic inspection. In the LSAW process, plate edges are beveled, formed in a JCO or UOE press, and joined by double-sided submerged arc welding. LSAW pipe is preferred for large diameters and higher pressure ratings where ERW coil width would limit the size.
ApplicationsWelded steel pipe is used across construction, energy and industry: water and sewage mains, structural columns and trusses, piling (ASTM A252), conveyor and handling systems, fire protection sprinkler lines, fence and railing posts, agricultural machinery and general fabrication. ERW pipe in standard sizes is a staple for Polish wholesalers, while LSAW large-diameter pipe serves port structures, bridges and municipal water projects.
Which Welded Pipe Do You Need?For diameters up to about 660 mm, ERW pipe delivers the best balance of price, availability and quality. Above 406 mm, or when the project specifies double-sided submerged arc welding, choose LSAW. For structural applications select EN 10219 S235JR to S355J2H or ASTM A500 grades; for piling specify ASTM A252; for pressure and water service EN 10217 or API 5L. Tell us the end use and we will recommend the most economical compliant specification.
Standards, Grades & Equivalents

StandardGradeTypical Use
ASTM A53A, BWelded and seamless, black or galvanizedASTM A252Grade 1 – 3Welded and seamless steel pipe pilesAPI 5LB – X70Welded line pipeEN 10217P235TR1 – P355GHWelded steel tubes for pressureEN 10219S235JR – S355J2HCold-formed welded hollow sectionsGB/T 3091Q195 – Q355Welded steel pipe for low-pressure fluid
Available Sizes & Range

ItemRangeNotes
ERW21.3 – 660 mmWT 2 – 20 mmLSAW406 – 2,500 mmWT 6 – 40 mmLength5.8 – 12.2 mrandom or fixed
Specification Deep-Dive for Welded Steel PipeWelded pipe offers the best price-to-performance ratio for most non-pressure and moderate pressure applications. ERW pipe is formed from hot-rolled coil and welded at high frequency, with the weld zone normalized or annealed to match the parent metal — diameters from 21.3 mm to 660 mm with wall thicknesses from 1.8 mm to 20 mm. LSAW pipe, formed from plate and welded by submerged arc on both sides, covers 406 mm to 1422 mm diameters for large water, slurry and structural lines. All ERW pipe passes eddy-current or ultrasonic weld inspection plus hydrostatic testing per ASTM A53 / EN 10219, and LSAW pipe is 100% ultrasonically tested along the weld. For structural applications we document yield strength, tensile strength, elongation and chemical composition, and for water supply we confirm compliance with EN 10255 or EN 10219 as specified. Polish fabricators and water utilities receive welded pipe with complete mill certificates, end protection and seaworthy packing, and we can arrange surface treatment (galvanizing, coating, painting) at our finishing lines before export.
Ordering Welded Pipe for Construction and IndustryWelded pipe orders in Poland typically specify the standard (ASTM A53, EN 10219, EN 10255), grade, diameter, wall thickness and length. Send your requirement and destination port and we will confirm price, production time and whether the batch will be ERW or LSAW, plain or bevelled ends. For structural projects we provide mill certificates matching your steel grade declarations for CE marking.
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
Is ERW pipe suitable for water supply?Yes. ERW pipe manufactured and tested to EN 10217, ASTM A53 or API 5L with a full-length weld inspection is widely used for water supply and distribution. For potable water contact, confirm the coating or lining requirement with your project engineer.
What lengths do you supply for welded pipe?Standard lengths are 5.8 m and 12 m, with random lengths from 5.5 to 12.2 m available. For LSAW pipe we can also supply cut-to-length pieces per your fabrication drawings.
What is the difference between ERW and LSAW welded pipe?ERW pipe is formed from coil and welded by high-frequency current — ideal up to about 660 mm diameter with economical pricing. LSAW is formed from plate and submerged-arc welded, used for large diameters above 406 mm and heavy wall thicknesses.
Do you supply welded pipe for structural CE marking?Yes. We provide mill certificates and test documentation that support EN 10219 structural declarations used by Polish fabricators for CE marking of steel structures.
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.