API 5L Grade B pipe is commonly used for transporting oil and gas in the petroleum industry. While it is an international standard, there are different equivalent ASTM standards for API 5L Grade B pipe depending on factors such as composition, mechanical properties, and applications.

The most commonly recognized equivalent ASTM standards for API 5L Grade B pipe include ASTM A53 Gr. B and ASTM A106 Gr. B.

ASTM A53 Gr. B is a seamless steel pipe specification that covers both black and hot-dipped galvanized pipe. It is suitable for structural and pressure applications.

ASTM A106 Gr. B is a seamless carbon steel pipe specification that covers high-temperature service. It is commonly used in refineries and plants to transport fluids and gases at elevated temperatures.

Both ASTM A53 Gr. B and ASTM A106 Gr. B have similar chemical composition and mechanical properties to API 5L Grade B. However, it is essential to consult specific requirements and project specifications to ensure the appropriate ASTM equivalent for API 5L Grade B pipe is selected.