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Steel piping is a fundamental component in multiple industries due to its strength, durability, and versatility. Its use ranges from fluid transportation to large-scale structures in construction and infrastructure.
Depending on the manufacturing process, there are two main types of steel pipes: seamless pipes and welded pipes. Both are produced under strict international standards that ensure their quality and reliability in critical applications such as the transportation of gas, oil, water, and chemicals, as well as in industrial, energy, and civil engineering projects.
Manufactured according to standards such as API 5L, ASTM A106 / A53 Gr. B, ASTM 312, DIN, JIS, ASME, ANSI B16.9, MSS SP-75, and NACE MR0175/0103, our seamless pipes are available in sizes ranging from 3/8” to 30”, with beveled or plain ends with protective caps.
These pipes are widely used in:
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Transportation of water, hydrocarbons, and chemical fluids
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Boiler systems
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Power plants
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High-pressure industrial processes
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Structural infrastructure such as stadiums, bridges, and airports
Manufacturing Process
The molten steel used to produce these pipes is obtained through processes such as:
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Blast Furnaces (BF) and Oxygen Converter Furnaces (BOF)
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Electric Arc Furnaces (EAF)
Seamless piping is characterized by its high strength, durability, and reliability under extreme conditions. Additionally, it can be produced as bi-standard or tri-standard pipes, complying with multiple specifications simultaneously, ensuring versatility of use and regulatory compliance.
Also known as welded pipes, they are manufactured by bending and welding metal sheets. Available types include:
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LSAW (Longitudinal Submerged Arc Welded)
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EFW (Electric Fusion Welded)
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ERW (Electric Resistance Welded)
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HFW (High Frequency Welded)
With outside diameters ranging from 21.3 mm to 1422 mm and thicknesses from 1 to 44.5 mm, these pipes are available in lengths from 5 to 22 meters. They comply with standards such as ASTM A53 A/B/C, API 5L PSL1/PSL2, in grades ranging from Gr. A, B up to X70.
They are ideal for applications such as:
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Transportation of oil, gas, and water
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Machinery manufacturing
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Engineering structures
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Industrial conduits
Welded pipes, also known as welded steel pipes, are manufactured from metal sheets that are bent and welded along their length to form a tubular structure. This type of piping can have either longitudinal or spiral welds, depending on the production method (LSAW, EFW, ERW, HFW).
Leying International’s products are present in over 20 countries and regions, covering Northeast, North, and East China, as well as key markets such as Europe, the Middle East, Southeast Asia, and Latin America.
Thanks to our technical expertise and commitment to quality, we serve a wide variety of sectors:
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Oil and gas
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Offshore exploration
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Coal mining
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Structural and architectural engineering
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Power generation
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Boiler industry
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Chemical processes
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Textile industry
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Construction and infrastructure
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Automotive and heavy machinery
With Leying International, you have a reliable partner in high-performance tubular solutions, offering technical capacity, regulatory support, and international coverage. Our commitment is to deliver quality, compliance, and added value in every project.