seamless steel pipe strength grade,smls steel pipe strength grade

Strength grade of seamless steel pipe

Date:2024-08-30

Seamless steel pipe is known for its high strength, resistance to high temperatures, and corrosion resistance, making it suitable for a wide range of applications, including in the petroleum, chemical, aviation, and aerospace industries. Seamless steel pipes are categorized based on their load-bearing capacity and performance characteristics into different strength grades. Here are the commonly used grades.

Standard Strength Grades:

Common steel grades include 20#, 35#, 45#, Q345B, 20G, and 16MnG. These are typically categorized under strength grades GB/T8162-2008 B and C.

Medium and High-Strength Grades:

For applications requiring medium to high strength, grades such as Q345, Q390, and 12CrMoV are used. These correspond to strength grades GB/T309-2001 A, B, and C.

Special High-Strength and Corrosion-Resistant Grades:

High-strength, high-corrosion-resistant, and high-temperature performance pipes include grades such as 00Cr17Ni14Mo2, 0Cr18Ni11Nb, and 0Cr18Ni9Ti. These are classified under strength grades GB/T14976-2002 A, B, and C.

Seamless Steel Pipe Strength Grade Parameters

The table below outlines the common seamless steel pipe strength grades, including their corresponding grades, sizes, weights, and other parameters.

Strength Grade	Grade	Dimensions (mm)	Weight (kg/m)
Class B	20#	8-426	0.4-80
Class B	35#	10-426	0.5-80
Class B	45#	16-426	0.9-80
Class B	Q345B	16-426	1.0-80
Class B	20G	8-426	0.4-80
Class B	16MnG	14-426	1.2-80
Class C	Q345	12-426	1.0-80
Class C	Q390	12-426	1.2-80
Class C	12CrMoV	12-426	1.5-80
Class A	00Cr17Ni14Mo2	6-530	0.5-150
Class A	0Cr18Ni11Nb	6-630	0.5-160
Class A	0Cr18Ni9Ti	6-630	0.5-160

The strength grades of seamless steel pipes are determined by their steel properties and intended usage characteristics. Each grade is suited for specific industries and applications, where they are subjected to varying loads and forces. A clear understanding of these strength grades and their parameters allows users to make informed decisions when selecting seamless steel pipes, ensuring project quality and safety while optimizing material and resource efficiency.