Q355 seamless steel pipe material analysis and introduction

Q355 seamless steel pipe is a high-quality low-alloy high-strength structural steel. The following is a detailed analysis of its material:

Q355 seamless steel pipe is a steel specified in the Chinese national standard GB/T 1591-2018. Q355 means that the yield strength of this steel is about 355 MPa, so it is named Q355. It has high strength, good plasticity and weldability, and certain low-temperature performance.

The chemical composition of Q355 seamless steel pipe mainly includes elements such as C, Si, Mn, P, S, and a small amount of alloying elements such as Cr, Ni and Cu. The content of C, Si and Mn is strictly controlled to ensure its mechanical properties and process performance. The proportion of specific chemical composition will vary according to different grades (A, B, C, D, E) and uses.

Q355 seamless steel pipe is divided into five grades: A, B, C, D, and E, representing different impact temperatures:

Q355A grade: no impact test.

Q355B grade: 20 degrees normal temperature impact test.

Q355C grade: 0 degree impact test.

Q355D grade: -20 degree impact test.

Q355E grade: -40 degree impact test.