What Is The Difference Between API 5L And A106?

manufacturing process
ASTM A106 and API 5L pipes have different manufacturing processes. ASTM A106 pipe is manufactured using a seamless hot-rolled steel process.
API 5L pipe, on the other hand, is manufactured by resistance welding (ERW) or longitudinal submerged arc welding (LSAW). The seamless manufacturing process used in ASTM A106 pipe results in a relatively smooth surface without any welded joints, whereas welded API 5L pipe has visible welded joints that require additional processing.
chemical composition
The chemical composition of the two sizes differs in carbon percentage.
ASTM A106 pipe contains only carbon, while API 5L pipe can contain a mix of carbon and alloy steels. ASTM A106 pipe has a maximum carbon content of 0.25% and a maximum manganese content of 0.27%.
API 5L pipes, on the other hand, vary in carbon content from 0.24% to 0.28%, with a top silicon content of 0.45% and a full manganese content of 1.2%. This composition affects the pipe's strength, weldability, and pressure handling capabilities.
Application areas
ASTM A106 and API 5L pipes are used in different industrial applications such as refineries, petrochemical plants, and gas transportation industries. ASTM A106 pipe is typically used for high-temperature services, while API 5L pipe is commonly used to transport gas, water, and oil in a variety of environments.