Seamless carbon steel pipes are made from steel ingots or solid billets that are perforated into tubes, and then hot rolled, cold rolled, or cold drawn. Seamless carbon steel pipes play an important role in China’s steel pipe industry.

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API 5L (American Petroleum Institute Specification 5L) is a widely used standard for the manufacturing and transportation of steel line pipes. It specifies the requirements for seamless and welded steel pipes suitable for conveying gas, oil, and water in the petroleum and natural gas industries.

Here are some key specifications outlined in API 5L:

  1. Grades: The standard covers various grades of steel pipes, including but not limited to API 5L Grade A, B, X42, X46, X52, X56, X60, X65, X70, X80, etc.
  2. Sizes: The pipes are available in different sizes ranging from nominal pipe size (NPS) 1/2″ to NPS 48″ (or DN 15 to DN 1200).
  3. Wall Thickness: The pipes have specified minimum wall thicknesses, commonly expressed in Schedule numbers (Sch 10, Sch 20, Sch 40, Sch STD, Sch XS, Sch XXS).
  4. Manufacturing Processes: API 5L allows both seamless and welded pipes. Seamless pipes are produced by hot or cold finishing processes, while welded pipes are manufactured by electric resistance welding (ERW), submerged arc welding (SAW), or longitudinal submerged arc welding (LSAW).
  5. Chemical Composition: The standard specifies the chemical composition requirements of the steel used in the pipes, including elements such as carbon, manganese, phosphorus, sulfur, silicon, copper, nickel, chromium, molybdenum, and vanadium.
  6. Mechanical Properties: API 5L defines the minimum yield strength, tensile strength, and impact toughness of the pipes at specific temperatures.
  7. Testing and Inspection: The standard outlines various tests and inspection procedures to ensure the quality and integrity of the pipes, including hydrostatic testing, non-destructive testing (NDT), dimensional inspection, visual inspection, etc.

Rizhao Azure-B Supply Chain Co.,Ltd is the top steel pipe stockist and distributor in China. As a first-tier agency of several major steel companies in China including TPCO, Baosteel and so on, We are committed to offering an easier way to international trade, leaving clients rest easy. Generally we hold steel pipe stock of at least 15000 tons per months with a sales about 30000 tons per month. In view of the special steel trade system in China, we are a major player in Chinese Steel market.

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