API 5L is the standard specification of the American Petroleum Institute for steel pipes of fluids such as oil and natural gas. It covers two types of steel pipes: seamless steel pipes and welded steel pipes, and is divided into two product specification grades: PSL1 (Basic grade) and PSL2 (Advanced grade). PSL1 is the most common and cost-effective type in the industry, suitable for general conveying applications.What is API 5L PSL1 carbon steel pipe?The API 5L PSL1 carbon s...