What is Q345B?

Q345 is a steel material. It is low-carbon steel (c <0.2%), good overall performance, good low temperature performance, the performance of cold stamping, welding performance and good cutting. Widely used in bridges, vehicles, ships, construction, pressure vessels. Q represents the yield of this material, behind the 345, the yield refers to the value of this material around the 345MPa. And will increase the thickness of the material and its yield value decreases.
By the Q + digital + quality rating symbols + deoxy method symbols. Its steel dubbed "Q", the representative of the yield point of steel, behind the numbers indicate the yield point value, the unit is MPa yield point such as Q235 (σs) of 235 MPa of carbon structural steel.

Standard: GB/T1591-2008

Advantage: Good low temperature performance, cold stamping performance

Higher grade: Q345C,Q345D,Q345E

 

The chemical component of  hot rolled steel plate Q345B

  C Si Mn S  P V Nb Ti
Q345B ≤0.20 ≤0.55 ≤1.70 ≤0.040 ≤0.040 0.02-0.15 0.015-0.060 0.02-0.20
 
The mechanical property of  hot rolled steel plate Q345B

Yield Strength

  ≤16mm 16—40mm 40—63mm 63—80mm 80—100mm 100-150mm 150-200mm
Q345B ≥345 ≥335 ≥325 ≥315 ≥305 ≥285 ≥275
Tensile strength: 450—630.
Impact:  20℃:≥34
 
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