Strength grade of seamless steel pipe

Seamless steel pipes are high-strength, temperature-resistant, and corrosion-resistant steel products, extensively used in industries such as petroleum, chemicals, aviation, and aerospace. Based on their load-bearing capacity and performance characteristics, seamless steel pipes are categorized into various strength grades, commonly including:

- General-purpose steel grades such as 20#, 35#, 45#, Q345B, 20G, and 16MnG, with strength levels specified under GB/T8162-2008 Grades B and C.

- Medium and high-strength steel grades like Q345, Q390, and 12CrMoV, with strength classifications defined by GB/T309-2001 Grades A, B, and C.

- Special high-strength, corrosion-resistant, and high-temperature pipes including seamless stainless steel grades like 00Cr17Ni14Mo2, 0Cr18Ni11Nb, and 0Cr18Ni9Ti, conforming to strength standards of GB/T14976-2002 Grades A, B, and C.

Seamless Steel Pipe Strength Grade Parameters

The following table lists the common seamless steel pipe strength grades and their corresponding grades, sizes, weights and other parameters.

Summary

Seamless steel pipes are categorized into strength grades based on their material properties and usage characteristics. Each strength grade is suited to specific industries and applications, with varying load and force capacities. By understanding these strength classifications and their technical parameters, users can make more informed choices when selecting seamless steel pipes, ensuring both project safety and quality. This knowledge also helps optimize material and resource efficiency.