API SPEC 5L is a globally recognized steel tube standard developed by the American Petroleum Institute, suitable for water, gas, and oil transportation in the petroleum and natural gas industries. This standard covers various types of steel pipes, including seamless steel pipes, straight seam steel pipes, and spiral seam steel pipes. ‌

Application scope of API SPEC 5L standard

The API SPEC 5L standard is applicable to the following types of steel pipes:

Seamless steel pipe: used in application scenarios that require high strength and reliability.

Straight seam steel pipe: including high-frequency resistance welded steel pipe (ERW), which is pressure welded by melting the edge of the pipe blank through high-frequency current.

Spiral seam steel pipe: including submerged arc welded steel pipes (LSAW and SSAW), commonly used for long-distance oil and gas pipelines.

API SPEC 5L standard grades and specifications

The API SPEC 5L standard specifies various steel pipe grades, including:

B: Transportation pipelines used for general purposes.

X42, X52, X60, X65: Used for high-pressure conveying pipelines.

X70, L245, L290, L320, L360, L390, L450, L485: Used for conveying pipelines with higher pressure and special requirements.

The specifications of these steel pipes include dimensional parameters such as outer diameter and wall thickness, ensuring compliance with standard requirements during production and use.