API 5L Standard aims to gas and water in oil and gas industry for reference, which is used for seamless steel pipe and welded steel pipe,including common port and port, pipe socket port and direct stream tube (TFL) and port has for a particular connection tube processing.

API Spec 5L PSL2 is an international standard that specifies manufacturing requirements for two product specification levels for seamless and welded steel pipes used in pipeline transportation systems in the oil and gas industry. Line pipes can be widely used in the transportation of gas, water and oil in petroleum, and the pipes can be cold-formed and galvanized according to customer requirements. API Spec 5L PSL2 standard main steel grades: API Spec 5L GrB, X42, X52, X65, X70, etc.