Round Bar

Seamless Pipe

Rectangular Pipe

Q345A Galvanized Square Tube

Implementation Standards

Seamless pipe: GB/30942000, weld pipe: GB/67282002

Scope of Application

The galvanized square tube has been galvanized on the square tube, so the application scope of the galvanized square tube has been greatly expanded than the square tube. It is mainly used for curtain wall, building, machinery manufacturing, steel construction projects, shipbuilding, solar powered bracket, steel structure engineering, electric power engineering, power plant, agriculture and chemical machinery, glass curtain wall, vehicle chassis, airport and so on.

Chemical Composition

Q345A：C≤0.20，Mn ≤1.70，Si≤0.50，P≤0.035，S≤0.035；

Q345B：C≤0.20，Mn ≤1.70，Si≤0.50，P≤0.035，S≤0.035；

Q345C：C≤0.20，Mn ≤1.70，Si≤0.50，P≤0.030，S≤0.030，Al≥0.015；

Q345D：C≤0.18，Mn ≤1.70，Si≤0.50，P≤0.030，S≤0.025，Al≥0.015；

Q345E：C≤0.18，Mn ≤1.70，Si≤0.50，P≤0.025，S≤0.020，Al≥0.015；

Q345A、B、C、D、E均含Nb≤0.07，V≤0.15，Ti≤0.20，Cr≤0.30，N≤0.012，Mo≤0.10。

20#、Q235B

Mechanical Property

Plain Carbon Steel
Tensile strength: 375~500 Q235, yield strength is more than 235, the elongation rate: = 25
No. 20: 390 to 530, the tensile strength yield strength is more than 235, the elongation rate: = 20

Product

Round Bar

Seamless Pipe

Rectangular Pipe

Q345A Galvanized Square Tube