Round Bar

Seamless Pipe

Rectangular Pipe

Q345B Square Tube

Implementation Standards

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

Applicable Scope

The use of square construction, machinery manufacturing, shipbuilding, steel construction projects, solar power support, steel structure engineering, power engineering, power plant, agricultural and chemical machinery, glass curtain wall, car chassis, airport, boiler construction, highway railings, housing construction, pressure vessels, oil tanks, bridges, power station equipment. Cranes and other high load welding etc..

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

Q235 tensile strength: 375 ~ 500, 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

Q345B Square Tube