If you're looking for high-quality seamless steel pipe for a large-scale industrial project, or if you're looking to establish a long-term partnership with a trusted global steel pipe manufacturer, you've come to the right place.
Seamless steel pipe is widely used in oil and gas, boiler manufacturing, automotive, machining, and high-pressure equipment. Its high strength, corrosion resistance, and lack of weld defects make it the material of choice for many critical projects.
But this comes with a caveat: you must choose a professional, reliable seamless pipe brand. Otherwise, even at a premium, you might end up with "faulty" steel pipe with uneven wall thickness, large dimensional deviations, or even failing to meet international standards. Believe us, we've seen this happen all too often.
In this article, we've selected the world's 12 most trusted seamless steel pipe manufacturers and suppliers. This authoritative list is based on years of in-depth research in the global steel pipe market.
Whether you're interested in standards like API 5L, ASTM A106, or EN 10210, or are looking for a partner that fits your budget, delivery schedule, region, or custom requirements, this article will provide you with a valuable purchasing guide.
Seamless steel pipe (also known as SMLS steel pipe), as the name suggests, is a type of steel pipe without weld seams. It is manufactured through a perforated and hot-rolled process. The key difference between seamless steel pipe and ordinary welded steel pipe is that the pipe body is formed in one piece, without weld seams. This provides it with higher strength, pressure resistance, and corrosion resistance. Precisely because of this characteristic, seamless steel pipe is widely used in harsh environments such as those with high temperatures, high pressures, and high strengths. (For more information, please click: What Is Seamless Pipe? Meaning, Uses, and How It’s Made)
Seamless steel pipe typically has a circular cross-section and is produced from a variety of materials, including carbon steel, alloy steel, and stainless steel. Standards such as ASTM A106, ASTM A53, EN10210, GB/T8163, and API 5L are implemented. Typical applications include oil and gas transportation, boilers and pressure vessels, machining, structural engineering, automotive manufacturing, shipbuilding, and aerospace.
Because of the lack of weld seams, seamless steel pipe offers superior strength in pressure-bearing pipelines and a longer service life than comparable welded pipes. For example, in natural gas transportation projects, choosing seamless steel pipe effectively eliminates the risk of weld leakage, significantly improving safety. In summary, if your project requires high structural stability, sealing, and durability, seamless steel pipes will be a more reliable choice.
Founded: 1949
Location: Pennsylvania, USA
Website: https://www.pennstainless.com/
Company Profile
Penn Stainless Products, Inc., founded in 1949, initially began as a stainless steel manufacturer. Following a reorganization in 1979, the company shifted its focus to distribution and processing, evolving into a leading full-category stainless steel service center in the United States. The company currently operates over 220,000 square feet of modern warehousing and processing facilities in Pennsylvania.
As a professional supplier of stainless steel materials, Penn Stainless offers a wide range of high-quality products, including seamless stainless steel pipes and tubes, which are widely used in pressure vessels, heat exchangers, petrochemical equipment, and food-grade piping. Its seamless steel pipe supply encompasses a variety of materials (such as 304/304L, 316/316L, and 317L), and it also provides customized processing services such as precision cutting, sizing, and polishing, meeting customers' one-stop needs from raw material procurement to engineering application.
Founded: 1994
Location: Missouri, USA
Website: https://amerpipe.com/
Company Profile
American Piping Products Inc. is a manufacturer and distributor of a broad portfolio of steel piping products, including seamless and welded carbon steel, alloy, and stainless steel pipes and tubing. They maintain large inventory holdings (over 60,000 tons in stock), allowing for rapid fulfillment of customer needs across various industries such as oil & gas, power generation, chemical, fabrication, and construction.
Certified to ISO 9001:2015, APP ensures consistent quality by pre‑qualifying suppliers, conducting product inspections, and providing material test reports (MTRs) for all shipments.
They provide in‑house processing services like sawing, flame cutting, beveling, threading, and coatings—adding value beyond just supplying raw seamless pipe stocks.
Founded: 2010
Location: Edmonton, Alberta, Canada
Website: https://www.bri-steel.com/
Company Profile
Bri‑Steel Manufacturing is a North American producer specializing in large-diameter seamless steel pipe, utilizing Thermal Pipe Expansion (TPE) technology to reliably manufacture sizes ranging from 12″ to 36″ OD with wall thicknesses up to 3.25″ (approx. 83 mm) . Originally based in Edmonton, Alberta, they launched their first seamless pipe TPE mill in Canada and expanded in 2023–2024 with a new 329,000 ft² facility in Enid, Oklahoma to bring 12″+ seamless pipe production back to the U.S.
Certified to API 5L, ISO 9001:2015, and API Q1, with PED and CSA Z245.1 approvals, Bri‑Steel produces both carbon steel and alloy seamless pipes meeting major industry standards. Their flexible TPE process enables short runs, rapid size changeovers (within ~3 hours), and minimized lead times.
Founded: 1962
Location: (Bergamo), Italy
Website: https://www.mega-spa.com/
Company Profile
M.E.G.A. S.p.A. is a leading Italian manufacturer specializing in forged steel fittings, branch outlets, and high-performance seamless steel pipes. Since its establishment in 1962, the company has expanded from basic fittings to multitechnological production capabilities, including the manufacture of special and large-diameter seamless pipes, often in carbon steel, stainless steel, duplex, and super duplex alloys.
Their seamless pipe production covers billets up to 11,000 mm in length and OD up to 1,400 mm, with minimal wall thickness as low as approximately 20 mm depending on dimensions. Pipes can be internally cladded with corrosion-resistant alloys (e.g. UNS N06625, 316L), and comply with Norsok M-650 standards for Duplex/SDSS options.
The company maintains a certified quality system with ISO 9001:2015, ISO 14001:2015, ASME, bureau Veritas Marine approvals, and an in-house ISO 17025 testing laboratory, enabling full traceability and compliance for industrial applications.
Founded: 1975
Location: Mumbai, Maharashtra, India
Website: https://www.steelpipesfactory.com/
Company Profile
Metallica Metals Group, featured as SteelPipesFactory, is a leading Indian manufacturer and stockholder of seamless steel pipes—including carbon steel, stainless steel, alloy steel, and high-nickel alloys. With daily sales exceeding 250 tons and annual volume over 70,000 tons, they hold extensive inventory—up to 15,000 tons of ASTM A106 seamless pipe alone in their Mumbai warehouses.
They serve global clients across petrochemical, infrastructure, fabrication, and industrial sectors, sourcing from reputable manufacturers such as Jindal and ISMT, and delivering to clients in over 70 countries.
Founded: 1927
Location: Michigan, USA
Website: https://www.mstube.com/
Company Profile
Michigan Seamless Tube (MST), founded in 1927, operates one of the few fully integrated U.S.-based facilities for manufacturing cold-drawn carbon and alloy seamless pipe and tube. With a 344,000 ft² state-of-the-art mill near Detroit, MST produces over 40,000 tons annually, serving niche markets with precision pressure pipe up to 2″ nominal size, mechanical tubing, boiler tubing, and OCTG systems.
They are also the exclusive domestic producer of Blue Diamond® A106 seamless pressure pipe, with high resistance to rust and consistent quality since acquiring the brand in 2014.
MST holds certifications such as ISO 9001, ISO/TS 16949, API mill approval, NCA 3800, and PED certification, ensuring high standards across industries including oil & gas, aerospace, automotive, and industrial fabrication.
Founded: 1970
Location: Tokyo, Japan
Website: https://www.nipponsteel.com/
Company Profile
Nippon Steel is Japan’s largest steelmaker and one of the world’s top producers. With fully integrated steelmaking and pipe plants—including state-of-the-art seamless pipe mills at Wakayama Works and Amagasaki Works—the company has pioneered technologies such as high-toe-angle piercers, inline heat treatment, and dynamically adjustable sizers to produce high-quality seamless pipes for carbon steel, alloy steel, stainless, duplex, and nickel-alloys.
They serve diverse industries—oil & gas, petrochemical, power, shipbuilding, and infrastructure—with high-integrity seamless OCTG, line pipe, boiler tubes, and specialty alloy tubes. Long-term contracts with Equinor and QatarEnergy demonstrate their global role in supplying high-alloy seamless pipes for CCS and offshore oil & gas applications.
Founded: 1983
Location: Saginaw, AL
Website: https://www.saginawpipe.com/
Company Profile
Saginaw Pipe Company is a well-established steel service center with over four decades of experience, serving as a one-stop supplier for structural steel and seamless carbon steel pipe products. Their core offering includes a full range of seamless carbon steel pipes—from 1/8″ up to 48″ OD, covering ASME/ASTM standards including A106, A53, A252, and API 5L grades. They also offer structural steel products such as tubing (square, rectangular, jumbo), beams, plate, bar, and angles, making them a comprehensive supplier across various project needs.
With a reputation for cut-to-length processing, fabrication services, and wide inventory on a single site, Saginaw Pipe ensures fast turnaround—particularly valuable in structural and oil & gas sectors requiring ready availability of seamless carbon pipe and tubing.
Founded: 1862
Location: Texas, USA
Website: https://www.dnow.com/
Company Profile
NOW Inc., now branded as DNOW Inc., serves as a global distributor of energy and industrial pipeline products and services. It caters to sectors including petroleum refining, chemical processing, LNG, power generation, and mining, offering a comprehensive portfolio of pipe, valves, fittings, flanges (PVF) and supply chain solutions.
DNOW holds a market-leading position in supplying seamless carbon steel pipes (ASTM A106, API 5L X42‑X70) and stainless & alloy seamless pipe products, backed by third-party quality and mill certification programs.
Main Products：
Seamless Carbon Steel Pipe (ASTM A106, API 5L B, X42–X70) in sizes from 1⁄8" up to 24" OD, schedules up to XXS, with options like lacquered, galvanized, FBE-coated, and beveled ends.
Stainless Steel & Alloy Seamless Pipe & Tubing in grades such as 304, 316L, high‑nickel alloys, suitable for corrosion‑resistant and high‑pressure applications.
Founded: 1998
Location: Tianjin, China
Website: https://uniasen.com/
Company Profile
UNIASEN is a leading Chinese manufacturer, exporter, and trader of steel pipes, especially carbon steel seamless pipes, with over two decades of industry experience and exports to more than 50 countries. Their annual seamless pipe capacity reaches up to 6 million tons, and they maintain over 20,000 tons of stock inventory to support fast turnaround—typically shipping stock items within 7 days and manufacturing non-stock orders within 30 days.
Equipped with ISO 9001, ISO 14001, ISO 45001 certifications and compliant with international standards including API 5L, ASTM A106/A53/A179/A333/A192, and EN 10216, they guarantee material traceability and global acceptance. UNIASEN also provides one-stop steel pipe solutions, including finishing, machining, packaging, engineering support, and multi-lingual customer service across major global markets.
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Founded: 1994
Location: Wuxi, China
Website: https://www.dexinpipe.com/
Company Profile
Dexin Steel Tube is the production arm of Wuxi Special Steel Material Co., Ltd., combining both distribution and manufacturing expertise. They specialize in large‑diameter seamless steel pipes (up to 1200 mm OD and 150 mm wall thickness) across carbon, alloy, and stainless grades. With an annual capacity of 100,000 tons, Dexin supports industries such as petroleum, chemicals, power generation, and gas cylinders, exporting globally to regions including North America, Europe, Asia, and the Middle East.
Their facilities are equipped for complete in‑house testing—including chemical analysis, non-destructive testing, hydraulic pressure testing—and heat treatments such as normalizing, tempering, and annealing using three advanced furnaces. Dexin holds certifications including ISO 9001, ISO 14001, API, and CE approvals, ensuring quality and reliability for international markets.
Main Products
Seamless Carbon Steel Pipes: ASTM A106, A333, line pipe, structure tubes, low/high-temperature service tubes.
Alloy Steel Seamless Pipes: ASTM A335, A213 for high-temperature and pressure applications
Low‑Temperature & Gas Cylinder Pipes: high-strength alloy steels like 34CrMo and others.
Structural & Line Pipes: large OD tubes (up to 1200 mm), thick‑wall configurations (up to 150 mm), supporting power, chemical, and line-pipe field applications.
Founded: 2019
Location: Garh, West Bengal, India
Website: https://www.globalseamless.com/
Company Profile
Global Seamless Tubes & Pipes Pvt. Ltd. is an integrated Indian seamless pipe and tube manufacturer backed by experienced technocrats with over 36 years of collective industry expertise. Their Bagnan facility spans 300,000 sq ft, housing both hot-finished/ pierced and cold-drawn seamless tube production in one complex, with a combined annual capacity of 24,000 metric tons. Equipped with advanced equipment including a Multi-stand rolling mill, bright annealing furnace, sizing mill, cold-draw benches, eddy-current & ultrasonic NDT machines, and fully automated hydrostatic testing, they ensure full process control from billet-to-pipe.
The company supports ASTM, GB, DIN, JIS specifications and offers quick turnaround—stock items can ship within 7 days, while non-standard orders typically within 30 days. Approximately half of production is exported to over 20 countries, enabled by proximity to major ports
Choosing the best seamless steel pipe manufacturer is not only related to product quality, but also directly affects the stability of the project, cost control, and subsequent maintenance. The following content can help you select the most worthy partner from among many manufacturers:
A quality seamless steel pipe manufacturer must have a comprehensive quality management system and internationally recognized certifications, such as ISO 9001, API 5L, API 5CT, ASTM, and EN 10210. These certifications directly reflect manufacturing capabilities, quality control capabilities, and export capabilities. Especially when participating in overseas projects or high-standard projects, certification is not only a stepping stone but also a key component of risk management.
High-quality seamless steel pipes are derived from high-quality raw materials. Major brand manufacturers typically source billets from major steel mills, such as Baosteel, Ansteel, or CITIC Pacific, which provide stable material quality and traceable performance. Be sure to confirm whether the manufacturer provides a material quality certificate (MTC) and ensure that their products meet the physical and chemical performance standards required for your project. This is especially important for high-temperature, high-pressure, or corrosive environments.
If you are undertaking an engineering project or overseas order, delivery time is often more important than price. A reliable seamless steel pipe manufacturer should have an annual production capacity exceeding tens of thousands of tons and sufficient inventory adjustment space to quickly respond to urgent needs. More efficient production scheduling and logistics coordination also means reduced time costs and the risk of default.
From structural pipes, pressure pipes, and hydraulic pipes, from carbon steel to alloy steel and stainless steel, a good manufacturer should offer a wide range of materials, standards (GB, ASTM, DIN, JIS), calibers, and wall thicknesses. This not only improves procurement efficiency but also reduces quality risks and transportation costs associated with sourcing from multiple channels.
As the core of a structure, defects in pipes can have serious consequences. An ideal manufacturer must be equipped with comprehensive testing equipment, such as ultrasonic testing, hydrostatic testing, eddy current testing, and spectral analysis. They must also have a system for spot-checking finished products and experience collaborating with third-party testing. Only by conducting 100% inspection before shipment can the release of hazardous products be minimized.
Now that you know what to look for when selecting a seamless steel pipe manufacturer, where to find them, and have a few options to get you started, you should be ready to start sourcing seamless steel pipe.
If you need affordable, quality-assured steel pipe products, then you can contact us. We are a leading seamless pipe manufacturer and supplier in China, with our own factory and export company, providing one-stop service. We welcome you to visit our seamless steel pipe catalog or contact us.
We hope this guide is helpful. If you have any questions, please leave a comment below.
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