China · SAC · SteelCurrent

GB/T 1591-2018

High strength low alloy structural steels

Q355, Q390, Q420, Q460 and higher. In force since 1 February 2019.

Replaced Q345 with Q355. Q345 still appears on older drawings and certificates.

Grades on Matipedia

GB/T 1591-2018

Q355

China's S355 counterpart, which replaced Q345 in GB/T 1591-2018. Q355B/C/D test 34 J at +20/0/−20 °C.

ReH

≥ 355 MPa

Rm

470–630 MPa

From the standard

1

Confirmed

2

Corroborated

1

Disagreements explained

2