The difference between API 5L Grade B steel pipe and No. 20 steel pipe

L245 in API 5L B steel pipe and API 5L B pipeline pipe is a steel grade in the API 5L pipeline pipe standard, equivalent to L245 or S245 in my country, and is mainly used for gas, water and oil transportation in the natural gas industry.

No. 20 steel pipe is a low-carbon steel pipe, which is a high-quality carbon structural steel pipe made of steel ingots or solid tube billets through perforation into rough pipes, and then hot rolled, cold rolled or cold drawn. The cutting processability of cold drawn or normalized state is better than that of annealed state, and it is generally used to manufacture workpieces with low stress and high toughness requirements.

API 5L Grade B steel pipe is mainly used for the transportation of oil and natural gas, and is suitable for long-distance transportation pipelines, such as long-distance pipelines and public pipelines. Its material can withstand high pressure and temperature and is suitable for various harsh environments. No. 20 steel pipe is mainly used for general mechanical structures, bridges, ships, etc. Its material strength and corrosion resistance are relatively low, and it is suitable for conventional mechanical processing and construction needs. API 5L Grade B steel pipe is more suitable for high-pressure transmission pipelines such as oil and natural gas due to its high strength and corrosion resistance, while No. 20 steel pipe is suitable for general mechanical structures and construction needs.

Chemical Composition of GB/T8163 20# fluid seamless pipe

Mechanical Properties of 20 # Seamless Steel Pipe