What does API 5L mean? 

API is the abbreviation of American Petroleum Institute, 5 refers to the 5th committee, and L refers to line pipe. So the API 5L standard is the line pipe standard referred to by the Fifth Committee of the American Petroleum Institute.

Its main contents are 1. It stipulates the grade, steel grade, and delivery status of API 5L standard steel pipes; 2. The purchase information materials that buyers need to submit; diameter and cold expansion, heat treatment, etc.; 4 acceptance limits, mainly including the chemical composition of the steel pipe, tensile properties, hydrostatic pressure test, bending test, flattening test, guided bending test, impact test, surface defects, dimensional deviation, etc.; 5. Inspection of steel pipes; 6. Marking, etc.

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