Carbon steel pipe is not synonymous with welded steel pipe. Carbon steel pipe refers to a type of steel pipe made from carbon steel, an iron-carbon alloy containing less than 2.11% carbon. In addition to carbon, it may include small amounts of silicon, manganese, phosphorus, sulfur, and trace elements. This type of pipe is widely used in industries such as construction, bridges, railways, vehicles, ships, and machinery manufacturing. Carbon steel pipes can be categorized into two main types based on the manufacturing process: carbon steel welded pipes and carbon steel seamless pipes.