What are Q345R steel plate chemical composition and properties

Q345R steel plate is a boiler vessel plate, which is widely used in petroleum, chemical industry, power station, boiler and other industries. It is generally used to make reactors, heat exchangers, separators, gas ducts, liquefied gas tanks, boiler gas bags and liquefied petroleum gas cylinders.

Chemical composition of Q345R steel plate
C：≤0.20
Si：≤0.55
Mn：1.20-1.70
P：≤0.025
S：≤0.010
Cu：≤0.30
Ni：≤0.30
Cr：≤0.30
Mo：≤0.08
Nb：≤0.050
V：≤0.050
Ti：≤0.030
Alt：≥0.020
Other Cu + Ni + Cr + Mo ≤0.70

Mechanical properties of Q345R steel plate
Yield strength: ≤16mm: ≥345, 16-36mm: ≥325, 36-60mm: ≥315, 60-100 mm: ≥305, 100-150 mm: ≥285, 150-200mm: ≥265
Tensile strength: 470-640
Impact test: temperature: 0℃: ≥34
Elongation: ≥21
High temperature mechanical properties: temperature: 500℃: 20-36: yield ≥180.