The proportion of main constituent elements of Q345 steel is basically the same as that of 16Mn steel, the difference is that V, Ti, Nb trace alloying elements are added.
A small amount of V, Ti, Nb alloying elements can refine the grains, greatly improve the toughness of the steel, and the comprehensive mechanical properties of the Q345 steel are greatly improved.
Because of this, the thickness of the Q345 steel plate can be made larger. Therefore, the comprehensive mechanical properties of Q345 steel should be better than that of 16Mn steel, especially the low temperature properties of Q345 steel are not available in 16Mn steel. The allowable stress of Q345 steel is slightly higher than that of 16Mn steel.
Mechanical properties of Q345D seamless pipe:
Tensile strength: 490-675 Yield strength: ≥345 Elongation: ≥22
Mechanical properties of Q345B seamless pipe:
Tensile strength: 490-675 Yield strength: ≥345 Elongation: ≥21
Mechanical properties of Q345A seamless pipe:
Tensile strength: 490-675 Yield strength: ≥345 Elongation: ≥21
Mechanical properties of Q345C seamless pipe:
Tensile strength: 490-675 Yield strength: ≥345 Elongation: ≥22
Mechanical properties of Q345E seamless pipe:
Tensile strength: 490-675 Yield strength: ≥345 Elongation: ≥22
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