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Is SA516 Gr 70 steel the Q345R ASME equivalent steel plate

Does Q345R ASME equivalent exist? Is SA516 Gr 70 steel the Q345R ASME equivalent? Many wonder about it and want to get professional reply.

In order to anser this question, it is unavoidable to discuss the chemical composition and mechanical properties of SA516 Gr 70 steel and Q345R steel.

Chemical composition of SA516 Gr 70 steel and Q345R steel:

Grade C Si Mn P S Alt
Q345R ≦0.20 ≦0.55 1.20-1.60 ≦0.025 ≦0.015 ≧0.020
SA516 Gr 70 ≦0.27 0.13-0.45 0.79-1.60 ≦0.035 ≦0.035  

Mechanical properties of SA516 Gr 70 steel and Q345R steel:

Grade Yield Strength Tensile Strength Elongation
(Mpa) (MPa) (%)
Q345R ≧325 500-630 ≧21
SA516 Gr 70 ≧260 485-620 ≧17

Q345R steel can meet chemical composition and mechanical properties demands of SA516 Gr 70 steel at most times. But that does not mean SA516 Gr 70 steel is the Q345R ASME equivalent. The steel strength property varies with the plate thickness. So it needs technician opinion to help choose between SA516 Gr 70 steel and Q345R steel according to the specific use and requirements.

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